Prospectus

July 1, 2016

 

Columbia Convertible Securities Fund

    

Class		Ticker Symbol
Class A Shares		PACIX
Class B Shares		NCVBX
Class C Shares		PHIKX
Class I Shares		CCSIX
Class R Shares		CVBRX
Class R4 Shares		COVRX
Class R5 Shares		COCRX
Class W Shares		CVBWX
Class Y Shares		CSFYX
Class Z Shares		NCIAX

As with all mutual funds, the Securities and Exchange Commission (SEC) has not approved or disapproved these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

Columbia Convertible Securities Fund

Summary of the Fund

Columbia Convertible Securities Fund

Summary of the Fund (continued)

The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that:

■	you invest $10,000 in the applicable class of Fund shares for the periods indicated,
■	your investment has a 5% return each year, and
■	the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expenses table above.

Since the waivers and/or reimbursements shown in the Annual Fund Operating Expenses table above expire as indicated in the preceding table, they are only reflected in the 1 year example and the first year of the other examples. Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:

    

Portfolio Turnover

The Fund may pay transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 71% of the average value of its portfolio.

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets (including the amount of any borrowings for investment purposes) in convertible securities. The Fund may invest up to 15% of its total assets in Eurodollar convertible securities and up to an additional 20% of its total assets in foreign securities. Most convertible securities are not investment grade-rated. Convertible securities rated below investment grade may be referred to as “junk bonds.” The Fund also may invest directly in equity securities.

The Fund looks for opportunities to participate in the potential growth of underlying common stocks, while seeking to earn income that is generally higher than the income those stocks provide. The Fund may sell common stocks short against positions in which the Fund has directly invested in convertible securities with no more than 10% of its assets.

4	Prospectus 2016

Columbia Convertible Securities Fund

Summary of the Fund (continued)

The Fund may invest in privately placed and other securities or instruments that are purchased and sold pursuant to Rule 144A or other exemptions under the Securities Act of 1933, as amended (the 1933 Act), subject to liquidity determinations and certain regulatory restrictions.

Principal Risks

An investment in the Fund involves risks, including those described below. There is no assurance that the Fund will achieve its investment objective and you may lose money . The value of the Fund’s holdings may decline, and the Fund’s net asset value (NAV) and share price may go down. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Active Management Risk. Due to its active management, the Fund could underperform its benchmark index and/or other funds with similar investment objectives and/or strategies.

Changing Distribution Level Risk. The amount of the distributions paid by the Fund will vary and generally depends on the amount of interest income and/or dividends received (less expenses) by the Fund on the securities it holds. If the Fund does not receive any such income and/or dividends, the Fund may not be in a position to make distributions to shareholders. If the interest income and/or dividends the Fund receives from its investments declines, the Fund may have to reduce its distribution level.

Convertible Securities Risk. Convertible securities are subject to the usual risks associated with debt instruments, such as interest rate risk and credit risk. Convertible securities also react to changes in the value of the common stock into which they convert, and are thus subject to market risk. The Fund may also be forced to convert a convertible security at an inopportune time, which may decrease the Fund’s return.

Credit Risk. Credit risk is the risk that the value of debt instruments may decline if the issuer thereof defaults or otherwise becomes unable or unwilling, or is perceived to be unable or unwilling, to honor its financial obligations, such as making payments to the Fund when due. Rating agencies assign credit ratings to certain fixed-income securities to indicate their credit risk. Lower quality or unrated securities held by the Fund may present increased credit risk as compared to higher-rated securities. Non-investment grade fixed-income instruments (commonly called “high-yield” or “junk”) may be subject to greater price fluctuations and are more likely to experience a default than investment grade fixed-income instruments and therefore may expose the Fund to increased credit risk. If the Fund purchases unrated securities, or if the ratings of securities held by the Fund are lowered after purchase, the Fund will depend on analysis of credit risk more heavily than usual.

Foreign Securities Risk. Investments in or exposure to foreign securities involve certain risks not associated with investments in or exposure to securities of U.S. companies. Foreign securities subject the Fund to the risks associated with investing in the particular country of an issuer, including the political, regulatory, economic, social, diplomatic and other conditions or events occurring in the country or region, as well as risks associated with less developed custody and settlement practices. Foreign securities may be more volatile and less liquid than securities of U.S. companies, and are subject to the risks associated with potential imposition of economic and other sanctions against a particular foreign country, its nationals or industries or businesses within the country. In addition, foreign governments may impose withholding or other taxes on the Fund’s income, capital gains or proceeds from the disposition of foreign securities, which could reduce the Fund’s return on such securities. The performance of the Fund may also be negatively impacted by fluctuations in a foreign currency's strength or weakness relative to the U.S. dollar, particularly to the extent the Fund invests a significant percentage of its assets in foreign securities or other assets denominated in currencies other than the U.S. dollar.

High-Yield Investments Risk. Securities and other debt instruments held by the Fund that are rated below investment grade (commonly called “high-yield” or “junk” bonds) and unrated debt instruments of comparable quality expose the Fund to a greater risk of loss of principal and income than a fund that invests solely or primarily in investment grade debt instruments. In addition, these investments have greater price fluctuations, are less liquid and are more likely to experience a default than higher-rated debt instruments. High-yield debt instruments are considered to be predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal.

Prospectus 2016

5

Columbia Convertible Securities Fund

Summary of the Fund (continued)

Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if prevailing interest rates (which are at historic lows) rise, the values of fixed-income instruments tend to fall, and if interest rates fall, the values of fixed-income instruments tend to rise. Changes in the value of a fixed-income instrument usually will not affect the amount of income the Fund receives from it but will generally affect the value of the Fund's shares. In general, the longer the maturity or duration of a fixed-income instrument, the greater its sensitivity to changes in interest rates. Interest rate declines also may increase prepayments of debt obligations, which, in turn, would increase prepayment risk. Similarly, a period of rising interest rates may negatively impact the Fund’s performance. Actions by governments and central banking authorities can result in increases in interest rates. Such actions may negatively affect the value of fixed-income instruments held by the Fund, resulting in a negative impact on the Fund's performance and NAV. Any interest rate increases could cause the value of the Fund’s investments in fixed-income instruments to decrease. Rising interest rates may prompt redemptions from the Fund, which may force the Fund to sell investments at a time when it is not advantageous to do so, which could result in losses.

Issuer Risk. An issuer in which the Fund invests or to which it has exposure may perform poorly, and the value of its securities may therefore decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors.

Liquidity Risk. Liquidity risk is the risk associated with any event, circumstance, or characteristic of an investment or market that negatively impacts the Fund’s ability to sell, or realize the proceeds from the sale of, an investment at a desirable time or price. Liquidity risk may arise because of, for example, a lack of marketability of the investment, which means that when seeking to sell its portfolio investments, the Fund could find that selling is more difficult than anticipated, especially during times of high market volatility. Decreases in the number of financial institutions, including banks and broker-dealers, willing to make markets (match up sellers and buyers) in the Fund’s investments or decreases in their capacity or willingness to trade such investments may increase the Fund’s exposure to this risk. The debt market has experienced considerable growth, and financial institutions making markets in instruments purchased and sold by the Fund (e.g., bond dealers) have been subject to increased regulation. The impact of that growth and regulation on the ability and willingness of financial institutions to engage in trading or “making a market” in such instruments remains unsettled. Certain types of investments, such as lower-rated securities or those that are purchased and sold in over-the-counter markets, may be especially subject to liquidity risk. Securities or other assets in which the Fund invests may be traded in the over-the-counter market rather than on an exchange and therefore may be more difficult to purchase or sell at a fair price, which may have a negative impact on the Fund’s performance. Market participants attempting to sell the same or a similar instrument at the same time as the Fund could exacerbate the Fund’s exposure to liquidity risk. The Fund may have to accept a lower selling price for the holding, sell other, liquid or more liquid, investments that it might otherwise prefer to hold (thereby increasing the proportion of the Fund’s investments in less liquid or illiquid securities), or forego another more appealing investment opportunity. Certain investments that were liquid when purchased by the Fund may later become illiquid, particularly in times of overall economic distress. Changing regulatory, market or other conditions or environments (for example, the interest rate or credit environments) may also adversely affect the liquidity and the price of the Fund's investments. Judgment plays a larger role in valuing illiquid or less liquid investments as compared to valuing liquid or more liquid investments. Price volatility may be higher for illiquid or less liquid investments as a result of, for example, the relatively less frequent pricing of such securities (as compared to liquid or more liquid investments). Generally, the less liquid the market at the time the Fund sells a portfolio investment, the greater the risk of loss or decline of value to the Fund. Overall market liquidity and other factors can lead to an increase in Fund redemptions, which may negatively impact Fund performance and NAV, including, for example, if the Fund is forced to sell investments in a down market.

Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or long periods.

6	Prospectus 2016

Columbia Convertible Securities Fund

Summary of the Fund (continued)

Preferred Stock Risk. Preferred stock is a type of stock that generally pays dividends at a specified rate and that has preference over common stock in the payment of dividends and the liquidation of assets. Preferred stock does not ordinarily carry voting rights. The price of a preferred stock is generally determined by earnings, type of products or services, projected growth rates, experience of management, liquidity, and general market conditions of the markets on which the stock trades. The most significant risks associated with investments in preferred stock include issuer risk, market risk and interest rate risk ( i.e. , the risk of losses attributable to changes in interest rates).

Prepayment and Extension Risk. Prepayment and extension risk is the risk that a bond or other security or investment might, in the case of prepayment risk, be called or otherwise converted, prepaid or redeemed before maturity and, in the case of extension risk, that the investment might not be called as expected. In the case of prepayment risk, if the investment is converted, prepaid or redeemed before maturity, the portfolio managers may not be able to invest the proceeds in other investments providing as high a level of income, resulting in a reduced yield to the Fund. In the case of mortgage- or asset-backed securities, as interest rates decrease or spreads narrow, the likelihood of prepayment increases. Conversely, extension risk is the risk that an unexpected rise in interest rates will extend the life of a mortgage- or asset-backed security beyond the prepayment time. If the Fund’s investments are locked in at a lower interest rate for a longer period of time, the portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads.

Rule 144A and Other Exempted Securities Risk. The Fund may invest in privately placed and other securities or instruments exempt from SEC registration (collectively “private placements”), subject to liquidity and other regulatory restrictions. In the U.S. market, private placements are typically sold only to qualified institutional buyers, or qualified purchasers, as applicable. An insufficient number of buyers interested in purchasing private placements at a particular time could affect adversely the marketability of such investments and the Fund might be unable to dispose of them promptly or at reasonable prices, subjecting the Fund to liquidity risk. The Fund may invest in private placements determined to be liquid as well as those determined to be illiquid. Even if determined to be liquid, the Fund’s holdings of private placements may increase the level of Fund illiquidity if eligible buyers are unable or unwilling to purchase them at a particular time. Issuers of Rule 144A eligible securities are required to furnish information to potential investors upon request. However, the required disclosure is much less extensive than that required of public companies and is not publicly available since the offering is not filed with the SEC. Further, issuers of Rule 144A eligible securities can require recipients of the information (such as the Fund) to agree contractually to keep the information confidential, which could also adversely affect the Fund’s ability to dispose of the security.

Short Positions Risk. The Fund may establish short positions which introduce more risk to the Fund than long positions (where the Fund owns the instrument or other asset) because the maximum sustainable loss on an instrument or other asset purchased (held long) is limited to the amount paid for the instrument or other asset plus the transaction costs, whereas there is no maximum price of the shorted instrument or other asset when purchased in the open market. Therefore, in theory, short positions have unlimited risk. The Fund’s use of short positions in effect “leverages” the Fund. Leverage potentially exposes the Fund to greater risks of loss due to unanticipated market movements, which may magnify losses and increase the volatility of returns. To the extent the Fund takes a short position in a derivative instrument or other asset, this involves the risk of a potentially unlimited increase in the value of the underlying instrument or other asset.

Performance Information

The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a broad measure of market performance.

The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class include the returns of the Fund’s Class A shares (without applicable sales charges and adjusted to reflect the higher class-related operating expenses of such

Prospectus 2016

7

Columbia Convertible Securities Fund

Summary of the Fund (continued)

classes, where applicable) for periods prior to its inception date. Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), the share classes of the Fund would have substantially similar annual returns because all share classes of the Fund invest in the same portfolio of securities.

The after-tax returns shown in the Average Annual Total Returns table below are calculated using the highest historical individual U.S. federal marginal income tax rates and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-advantaged accounts such as 401(k) plans or Individual Retirement Accounts (IRAs). The after-tax returns are shown only for Class A shares and will vary for other share classes. Returns after taxes on distributions and sale of Fund shares are higher than before-tax returns for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of Fund shares.

The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiathreadneedle.com/us.

    

Year by Year Total Return (%) as of December 31 Each Year*	Best and Worst Quarterly Returns During the Period Shown in the Bar Chart
	Best	3rd Quarter 2009	12.42%
	Worst	4th Quarter 2008	-17.91%

*	Year to Date return as of March 31, 2016: -3.19%

8	Prospectus 2016

Columbia Convertible Securities Fund

More Information About the Fund

Columbia Convertible Securities Fund

More Information About the Fund (continued)

Changing Distribution Level Risk. The amount of the distributions paid by the Fund will vary and generally depends on the amount of interest income and/or dividends received (less expenses) by the Fund on the securities it holds. If the Fund does not receive any such income and/or dividends, the Fund may not be in a position to make distributions to shareholders. If the interest income and/or dividends the Fund receives from its investments declines, the Fund may have to reduce its distribution level.

Convertible Securities Risk. Convertible securities are subject to the usual risks associated with debt instruments, such as interest rate risk (the risk of losses attributable to changes in interest rates) and credit risk (the risk that the issuer of a debt instrument will default or otherwise become unable, or be perceived to be unable or unwilling, to honor a financial obligation, such as making payments to the Fund when due). Convertible securities also react to changes in the value of the common stock into which they convert, and are thus subject to market risk (the risk that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise). Because the value of a convertible security can be influenced by both interest rates and the common stock's market movements, a convertible security generally is not as sensitive to interest rates as a similar debt instrument, and generally will not vary in value in response to other factors to the same extent as the underlying common stock. In the event of a liquidation of the issuing company, holders of convertible securities would typically be paid before the company's common stockholders but after holders of any senior debt obligations of the company. The Fund may be forced to convert a convertible security before it otherwise would choose to do so, which may decrease the Fund's return.

Credit Risk. Credit risk is the risk that the value of debt instruments may decline if the issuer thereof defaults or otherwise becomes unable or unwilling, or is perceived to be unable or unwilling, to honor its financial obligations, such as making payments to the Fund when due. Various factors could affect the actual or perceived willingness or ability of the issuer to make timely interest or principal payments, including changes in the financial condition of the issuer or in general economic conditions. Rating agencies assign credit ratings to certain fixed-income instruments to indicate their credit risk. Lower quality or unrated securities held by the Fund may present increased credit risk as compared to higher-rated securities. Non-investment grade fixed-income instruments (commonly called “high-yield” or “junk”) may be subject to greater price fluctuations and are more likely to experience a default than investment grade fixed-income instruments and therefore may expose the Fund to increased credit risk. If the Fund purchases unrated fixed-income securities, or if the ratings of such investments held by the Fund are lowered after purchase, the Fund will depend on analysis of credit risk more heavily than usual.

Foreign Securities Risk. Investments in or exposure to foreign securities involve certain risks not associated with investments in or exposure to securities of U.S. companies. For example, foreign markets can be extremely volatile. Foreign securities may also be less liquid than securities of U.S. companies so that the Fund may, at times, be unable to sell foreign securities at desirable times or prices. Brokerage commissions, custodial costs and other fees are also generally higher for foreign securities. The Fund may have limited or no legal recourse in the event of default with respect to certain foreign securities, including those issued by foreign governments. In addition, foreign governments may impose withholding or other taxes on the Fund’s income, capital gains or proceeds from the disposition of foreign securities, which could reduce the Fund’s return on such securities. In some cases, such withholding or other taxes could potentially be confiscatory. Other risks include: possible delays in the settlement of transactions or in the payment of income; generally less publicly available information about foreign companies; the impact of economic, political, social, diplomatic or other conditions or events; possible seizure, expropriation or nationalization of a company or its assets or the assets of a particular investor or category of investors; accounting, auditing and financial reporting standards that may be less comprehensive and stringent than those applicable to domestic companies; the imposition of economic and other sanctions against a particular foreign country, its nationals or industries or businesses within the country; and the generally less stringent standard of care to which local agents may be held in the local markets. In addition, it may be difficult to obtain reliable information about the securities and business operations of certain foreign issuers. Governments or trade groups may compel local agents to hold securities in designated depositories that are not subject to independent evaluation. The less developed a country’s securities market is, the greater the level of risks. The risks posed by sanctions against a particular foreign country, its nationals or industries or businesses within the country may be heightened to the extent the Fund invests significantly in the affected country or region or in issuers from the affected country that depend on global markets.

12	Prospectus 2016

Columbia Convertible Securities Fund

More Information About the Fund (continued)

The performance of the Fund may also be negatively impacted by fluctuations in a foreign currency's strength or weakness relative to the U.S. dollar, particularly to the extent the Fund invests a significant percentage of its assets in foreign securities or other assets denominated in currencies other than the U.S. dollar. Currency rates in foreign countries may fluctuate significantly over short or long periods of time for a number of reasons, including changes in interest rates, imposition of currency exchange controls and economic or political developments in the U.S. or abroad. The Fund may also incur currency conversion costs when converting foreign currencies into U.S. dollars and vice versa.

High-Yield Investments Risk. Securities and other debt instruments held by the Fund that are rated below investment grade (commonly called “high-yield” or “junk” bonds) and unrated debt instruments of comparable quality tend to be more sensitive to credit risk than higher-rated debt instruments and may experience greater price fluctuations in response to perceived changes in the ability of the issuing entity or obligor to pay interest and principal when due than to changes in interest rates. These investments are generally more likely to experience a default than higher-rated debt instruments. High-yield debt instruments are considered to be predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal. These debt instruments typically pay a premium – a higher interest rate or yield – because of the increased risk of loss, including default. High-yield debt instruments may require a greater degree of judgment to establish a price, may be difficult to sell at the time and price the Fund desires, may carry high transaction costs, and also are generally less liquid than higher-rated debt instruments. The ratings provided by third party rating agencies are based on analyses by these ratings agencies of the credit quality of the debt instruments and may not take into account every risk related to whether interest or principal will be timely repaid. In adverse economic and other circumstances, issuers of lower-rated debt instruments are more likely to have difficulty making principal and interest payments than issuers of higher-rated debt instruments.

Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if prevailing interest rates (which are at historic lows) rise, the values of fixed-income instruments tend to fall, and if interest rates fall, the values of fixed-income instruments tend to rise. Changes in the value of a fixed-income instrument usually will not affect the amount of income the Fund receives from it but will generally affect the value of the Fund's shares. In general, the longer the maturity or duration of a fixed-income instrument, the greater its sensitivity to changes in interest rates. Interest rate declines also may increase prepayments of debt obligations, which, in turn, would increase prepayment risk. Similarly, a period of rising interest rates may negatively impact the Fund’s performance. Actions by governments and central banking authorities can result in increases in interest rates. Such actions may negatively affect the value of fixed-income instruments held by the Fund, resulting in a negative impact on the Fund's performance and NAV. Any interest rate increases could cause the value of the Fund’s investments in fixed-income instruments to decrease. Rising interest rates may prompt redemptions from the Fund, which may force the Fund to sell investments at a time when it is not advantageous to do so, which could result in losses.

Issuer Risk. An issuer in which the Fund invests or to which it has exposure may perform poorly, and the value of its securities may therefore decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors.

Liquidity Risk. Liquidity risk is the risk associated with any event, circumstance, or characteristic of an investment or market that negatively impacts the Fund’s ability to sell, or realize the proceeds from the sale of, an investment at a desirable time or price. Liquidity risk may arise because of, for example, a lack of marketability of the investment, which means that when seeking to sell its portfolio investments, the Fund could find that selling is more difficult than anticipated, especially during times of high market volatility. Decreases in the number of financial institutions, including banks and broker-dealers, willing to make markets (match up sellers and buyers) in the Fund’s investments or decreases in their capacity or willingness to trade such investments may increase the Fund’s exposure to this risk. The debt market has experienced considerable growth, and financial institutions making markets in instruments purchased and sold by the Fund (e.g., bond dealers) have been subject to increased regulation. The impact of that growth and regulation on the ability and willingness of financial institutions to engage in trading or “making a market” in such instruments remains unsettled. Certain types of investments, such as lower-rated securities or those that are

Prospectus 2016

13

Columbia Convertible Securities Fund

More Information About the Fund (continued)

purchased and sold in over-the-counter markets, may be especially subject to liquidity risk. Securities or other assets in which the Fund invests may be traded in the over-the-counter market rather than on an exchange and therefore may be more difficult to purchase or sell at a fair price, which may have a negative impact on the Fund’s performance. Market participants attempting to sell the same or a similar instrument at the same time as the Fund could exacerbate the Fund’s exposure to liquidity risk. The Fund may have to accept a lower selling price for the holding, sell other, liquid or more liquid, investments that it might otherwise prefer to hold (thereby increasing the proportion of the Fund’s investments in less liquid or illiquid securities), or forego another more appealing investment opportunity. Certain investments that were liquid when purchased by the Fund may later become illiquid, particularly in times of overall economic distress. Changing regulatory, market or other conditions or environments (for example, the interest rate or credit environments) may also adversely affect the liquidity and the price of the Fund's investments. Judgment plays a larger role in valuing illiquid or less liquid investments as compared to valuing liquid or more liquid investments. Price volatility may be higher for illiquid or less liquid investments as a result of, for example, the relatively less frequent pricing of such securities (as compared to liquid or more liquid investments). Generally, the less liquid the market at the time the Fund sells a portfolio investment, the greater the risk of loss or decline of value to the Fund. Overall market liquidity and other factors can lead to an increase in Fund redemptions, which may negatively impact Fund performance and NAV, including, for example, if the Fund is forced to sell investments in a down market.

Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. The value of Fund investments may fall or fail to rise because of a variety of actual or perceived factors affecting an issuer (e.g., an unfavorable earnings report), the industry or sector in which it operates, or the market as a whole, which may reduce the value of an investment in the Fund. Accordingly, an investment in the Fund could lose money over short or long periods. The market values of the investments the Fund holds can be affected by changes or perceived changes in U.S. or foreign economies and financial markets, and the liquidity of these investments, among other factors.

Preferred Stock Risk. Preferred stock is a type of stock that generally pays dividends at a specified rate and that has preference over common stock in the payment of dividends and the liquidation of assets. Preferred stock does not ordinarily carry voting rights. The price of a preferred stock is generally determined by earnings, type of products or services, projected growth rates, experience of management, liquidity, and general market conditions of the markets on which the stock trades. The most significant risks associated with investments in preferred stock include issuer risk, market risk and interest rate risk ( i.e. , the risk of losses attributable to changes in interest rates).

Prepayment and Extension Risk. Prepayment and extension risk is the risk that a bond or other security or investment might, in the case of prepayment risk, be called or otherwise converted, prepaid or redeemed before maturity and, in the case of extension risk, that the investment might not be called as expected. In the case of prepayment risk, if the investment is converted, prepaid or redeemed before maturity, the portfolio managers may not be able to invest the proceeds in other investments providing as high a level of income, resulting in a reduced yield to the Fund. In the case of mortgage- or other asset-backed securities, as interest rates decrease or spreads narrow, the likelihood of prepayment increases. Conversely, extension risk is the risk that an unexpected rise in interest rates will extend the life of a mortgage- or asset-backed security beyond the prepayment time. If the Fund's investments are locked in at a lower interest rate for a longer period of time, the portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads.

Rule 144A and Other Exempted Securities Risk. The Fund may invest in privately placed and other securities or instruments exempt from SEC registration (collectively “private placements”), subject to liquidity and other regulatory restrictions. In the U.S. market, private placements are typically sold only to qualified institutional buyers, or qualified purchasers, as applicable. An insufficient number of buyers interested in purchasing private placements at a particular time could affect adversely the marketability of such investments and the Fund might be unable to dispose of them promptly or at reasonable prices, subjecting the Fund to liquidity risk. The Fund may invest in private placements determined to be liquid as well as those determined to be illiquid. Even if determined to be liquid, the Fund’s holdings of private placements may increase the level of Fund illiquidity if eligible buyers are unable or unwilling to purchase them at a particular time. The Fund may also have to bear the expense of registering the securities for resale and the risk of substantial delays in effecting the registration. Additionally, the purchase price

14	Prospectus 2016

Columbia Convertible Securities Fund

More Information About the Fund (continued)

and subsequent valuation of private placements typically reflect a discount, which may be significant, from the market price of comparable securities for which a more liquid market exists. Issuers of Rule 144A eligible securities are required to furnish information to potential investors upon request. However, the required disclosure is much less extensive than that required of public companies and is not publicly available since the offering is not filed with the SEC. Further, issuers of Rule 144A eligible securities can require recipients of the information (such as the Fund) to agree contractually to keep the information confidential, which could also adversely affect the Fund’s ability to dispose of the security.

Short Positions Risk. The Fund may establish short positions which introduce more risk to the Fund than long positions (where the Fund owns the instrument or other asset) because the maximum sustainable loss on an instrument or other asset purchased (held long) is limited to the amount paid for the instrument or other asset plus the transaction costs, whereas there is no maximum price of the shorted instrument or other asset when purchased in the open market. Therefore, in theory, short positions have unlimited risk. The Fund’s use of short positions in effect “leverages” the Fund. Leverage potentially exposes the Fund to greater risks of loss due to unanticipated market movements, which may magnify losses and increase the volatility of returns. To the extent the Fund takes a short position in a derivative instrument or other asset, this involves the risk of a potentially unlimited increase in the value of the underlying instrument or other asset.

Additional Investment Strategies and Policies

This section describes certain investment strategies and policies that the Fund may utilize in pursuit of its investment objective and some additional factors and risks involved with investing in the Fund.

Investment Guidelines

As a general matter, and except as specifically described in the discussion of the Fund's principal investment strategies in this prospectus or as otherwise required by the Investment Company Act of 1940, as amended (the 1940 Act), the rules and regulations thereunder and any applicable exemptive relief, whenever an investment policy or limitation states a percentage of the Fund's assets that may be invested in any security or other asset or sets forth a policy regarding an investment standard, compliance with that percentage limitation or standard will be determined solely at the time of the Fund's investment in the security or asset.

Holding Other Kinds of Investments

The Fund may hold investments that are not part of its principal investment strategies. These investments and their risks are described below and/or in the SAI. The Fund may choose not to invest in certain securities described in this prospectus and in the SAI, although it has the ability to do so. Information on the Fund’s holdings can be found in the Fund’s shareholder reports or by visiting columbiathreadneedle.com/us.

Transactions in Derivatives

The Fund may enter into derivative transactions or otherwise have exposure to derivative transactions through underlying investments. Derivatives are financial contracts whose values are, for example, based on (or “derived” from) traditional securities (such as a stock or bond), assets (such as a commodity like gold or a foreign currency), reference rates (such as the London Interbank Offered Rate (commonly known as LIBOR)) or market indices (such as the Standard & Poor's (S&P) 500 ^® Index). The use of derivatives is a highly specialized activity which involves investment techniques and risks different from those associated with ordinary portfolio securities transactions. Derivatives involve special risks and may result in losses or may limit the Fund's potential gain from favorable market movements. Derivative strategies often involve leverage, which may exaggerate a loss, potentially causing the Fund to lose more money than it would have lost had it invested in the underlying security or other asset directly. The values of derivatives may move in unexpected ways, especially in unusual market conditions, and may result in increased volatility in the value of the derivative and/or the Fund’s shares, among other consequences. The use of derivatives may also increase the amount of taxes payable by shareholders holding shares in a taxable account. Other risks arise from the Fund's potential inability to terminate or to sell derivative positions. A liquid secondary market may not always exist for the Fund's derivative positions at times when the Fund might wish to terminate or to sell such positions. Over-the-counter instruments (investments not traded on an exchange) may be illiquid, and transactions in

Prospectus 2016

15

Columbia Convertible Securities Fund

More Information About the Fund (continued)

derivatives traded in the over-the-counter market are subject to the risk that the other party will not meet its obligations. The use of derivatives also involves the risks of mispricing or improper valuation and that changes in the value of the derivative may not correlate perfectly with the underlying security, asset, reference rate or index. The Fund also may not be able to find a suitable derivative transaction counterparty, and thus may be unable to engage in derivative transactions when it is deemed favorable to do so, or at all. U.S. federal legislation has been enacted that provides for new clearing, margin, reporting and registration requirements for participants in the derivatives market. These changes could restrict and/or impose significant costs or other burdens upon the Fund’s participation in derivatives transactions. For more information on the risks of derivative investments and strategies, see the SAI.

Affiliated Fund Investing

The Investment Manager or an affiliate serves as investment adviser to funds using the Columbia brand (Columbia Funds), including those that are structured as “fund-of-funds”, and provides asset-allocation services to (i) shareholders by investing in shares of other Columbia Funds, which may include the Fund (collectively referred to in this section as Underlying Funds), and (ii) discretionary managed accounts (collectively referred to as affiliated products) that invest exclusively in Underlying Funds. These affiliated products, individually or collectively, may own a significant percentage of the outstanding shares of one or more Underlying Funds, and the Investment Manager seeks to balance potential conflicts of interest between the affiliated products and the Underlying Funds in which they invest. The affiliated products’ investment in the Underlying Funds may have the effect of creating economies of scale, possibly resulting in lower expense ratios for the Underlying Funds, because the affiliated products may own substantial portions of the shares of Underlying Funds. However, redemption of Underlying Fund shares by one or more affiliated products could cause the expense ratio of an Underlying Fund to increase, as its fixed costs would be spread over a smaller asset base. Because of large positions of certain affiliated products, the Underlying Funds may experience relatively large inflows and outflows of cash due to affiliated products’ purchases and sales of Underlying Fund shares. Although the Investment Manager or its affiliate may seek to minimize the impact of these transactions where possible, for example, by structuring them over a reasonable period of time or through other measures, Underlying Funds may experience increased expenses as they buy and sell portfolio securities to manage the cash flow effect related to these transactions. Further, when the Investment Manager or its affiliate structures transactions over a reasonable period of time in order to manage the potential impact of the buy and sell decisions for the affiliated products, those affiliated products, including funds-of-funds, may pay more or less (for purchase activity), or receive more or less (for redemption activity), for shares of the Underlying Funds than if the transactions were executed in one transaction. In addition, substantial redemptions by affiliated products within a short period of time could require the Underlying Fund to liquidate positions more rapidly than would otherwise be desirable, which may have the effect of reducing or eliminating potential gain or causing it to realize a loss. In order to meet such redemptions, an Underlying Fund may be forced to sell its liquid (or more liquid) positions, leaving the Underlying Fund holding, post-redemption, a relatively larger position in illiquid securities (securities that are not readily marketable or that cannot be sold or disposed of in the ordinary course of business, within seven days, at approximately the value at which the holder has valued the security) or less liquid securities. Substantial redemptions may also adversely affect the ability of the Underlying Fund to implement its investment strategy. The Investment Manager or its affiliate also has an economic conflict of interest in determining the allocation of affiliated products’ assets among the Underlying Funds, as it earns different fees from the various Underlying Funds.

Investing in Money Market Funds

The Fund may invest cash in, or hold as collateral for certain investments, shares of registered or unregistered money market funds, including funds advised by the Investment Manager or its affiliates. These funds are not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency. The Fund and its shareholders indirectly bear a portion of the expenses of any money market fund or other fund in which the Fund may invest.

16	Prospectus 2016

Columbia Convertible Securities Fund

More Information About the Fund (continued)

Lending of Portfolio Securities

The Fund may lend portfolio securities to broker-dealers or other financial intermediaries on a fully collateralized basis in order to earn additional income. The Fund may lose money from securities lending if, for example, it is delayed in or prevented from selling the collateral after the loan is made or recovering the securities loaned or if it incurs losses on the reinvestment of cash collateral.

The Fund currently does not participate in the securities lending program but the Board of Trustees (the Board) may determine to renew participation in the future. For more information on lending of portfolio securities and the risks involved, see the SAI and the annual and semiannual reports to shareholders.

Investing Defensively

The Fund may from time to time take temporary defensive investment positions that may be inconsistent with the Fund’s principal investment strategies in attempting to respond to adverse market, economic, political, social or other conditions, including, without limitation, investing some or all of its assets in money market instruments or shares of affiliated or unaffiliated money market funds or holding some or all of its assets in cash or cash equivalents. The Fund may take such defensive investment positions for as long a period as deemed necessary.

The Fund may not achieve its investment objective while it is investing defensively. Investing defensively may adversely affect Fund performance. During these times, the portfolio managers may make frequent portfolio holding changes, which could result in increased trading expenses and taxes, and decreased Fund performance. See also Investing in Money Market Funds above for more information.

Other Strategic and Investment Measures

The Fund may also from time to time take temporary portfolio positions that may or may not be consistent with the Fund’s principal investment strategies in attempting to respond to adverse market, economic, political, social or other conditions, including, without limitation, investing in derivatives, such as forwards contracts, futures contracts, options, structured investments and swaps, for various purposes, including among others, investing in particular derivatives in seeking to reduce investment exposures, or in seeking to achieve indirect investment exposures, to a sector, country, region or currency where the Investment Manager believes such positioning is appropriate. The Fund may take such portfolio positions for as long a period as deemed necessary. While the Fund is so positioned, derivatives could comprise a substantial portion of the Fund’s investments and the Fund may not achieve its investment objective. Investing in this manner may adversely affect Fund performance. During these times, the portfolio managers may make frequent portfolio holding changes, which could result in increased trading expenses and taxes, and decreased Fund performance. For information on the risks of investing in derivatives, see Transactions in Derivatives above.

Portfolio Holdings Disclosure

The Board has adopted policies and procedures that govern the timing and circumstances of disclosure to shareholders and third parties of information regarding the securities owned by the Fund. A description of these policies and procedures is included in the SAI. Fund policy generally permits the disclosure of portfolio holdings information on the Fund's website (columbiathreadneedle.com/us) only after a certain amount of time has passed, as described in the SAI.

Purchases and sales of portfolio securities can take place at any time, so the portfolio holdings information available on the Fund's website may not always be current.

Prospectus 2016

17

Columbia Convertible Securities Fund

More Information About the Fund (continued)

eDelivery and Mailings to Households

In order to reduce shareholder expenses, the Fund may, if prior consent has been provided, mail only one copy of the Fund’s prospectus and each annual and semiannual report to those addresses shared by two or more accounts. If you wish to receive separate copies of these documents, call 800.345.6611 or, if your shares are held through a financial intermediary, contact your intermediary directly. Additionally, you may elect to enroll in eDelivery to receive electronic versions of these documents by logging into your account at columbiathreadneedle.com/us.

Cash Flows

The timing and magnitude of cash inflows from investors buying Fund shares could prevent the Fund from always being fully invested. Conversely, the timing and magnitude of cash outflows to shareholders redeeming Fund shares could require the Fund to sell portfolio securities at less than opportune times or to hold ready reserves of uninvested cash in amounts larger than might otherwise be the case to meet shareholder redemptions. Either situation could adversely impact the Fund’s performance.

Understanding Annual Fund Operating Expenses

The Fund’s annual operating expenses, as presented in the Annual Fund Operating Expenses table in the Fees and Expenses of the Fund section of this prospectus, generally are based on expenses incurred during the Fund’s most recently completed fiscal year, may vary by share class and are expressed as a percentage (expense ratio) of the Fund’s average net assets during that fiscal year. The expense ratios reflect the Fund’s fee arrangements as of the date of this prospectus and, unless indicated otherwise, are based on expenses incurred during the Fund’s most recent fiscal year. The Fund’s assets will fluctuate, but unless indicated otherwise in the Annual Fund Operating Expenses table, no adjustments have been or will be made to the expense ratios to reflect any differences in the Fund’s average net assets between the most recently completed fiscal year and the date of this prospectus or a later date. In general, the Fund’s expense ratios will increase as its net assets decrease, such that the Fund’s actual expense ratios may be higher than the expense ratios presented in the Annual Fund Operating Expenses table if assets fall. Any commitment by the Investment Manager and/or its affiliates to waive fees and/or cap (reimburse) expenses is expected, in part, to limit the impact of any increase in the Fund’s expense ratios that would otherwise result because of a decrease in the Fund’s assets in the current fiscal year. The Fund’s annual operating expenses are comprised of (i) investment management fees, (ii) distribution and/or service fees, and (iii) other expenses. Management fees do not vary by class, but distribution and/or service fees and other expenses may vary by class.

18	Prospectus 2016

Columbia Convertible Securities Fund

More Information About the Fund (continued)

The Investment Manager

Columbia Management Investment Advisers, LLC is located at 225 Franklin Street, Boston, MA 02110 and serves as investment adviser and administrator to the Columbia Funds. The Investment Manager is a registered investment adviser and a wholly-owned subsidiary of Ameriprise Financial. The Investment Manager’s management experience covers all major asset classes, including equity securities, fixed-income securities and money market instruments. In addition to serving as an investment adviser to traditional mutual funds, exchange-traded funds and closed-end funds, the Investment Manager acts as an investment adviser for itself, its affiliates, individuals, corporations, retirement plans, private investment companies and financial intermediaries.

Subject to oversight by the Board, the Investment Manager manages the day-to-day operations of the Fund, determining what securities and other investments the Fund should buy or sell and executing portfolio transactions. The Investment Manager may use the research and other capabilities of its affiliates and third parties in managing the Fund’s investments. The Investment Manager is also responsible for overseeing the administrative operations of the Fund, including the general supervision of the Fund’s operations, the coordination of the Fund’s service providers and the provision of related clerical and administrative services.

The SEC has issued an order that permits the Investment Manager, subject to the approval of the Board, to appoint an unaffiliated subadviser or to change the terms of a subadvisory agreement for the Fund without first obtaining shareholder approval. The order permits the Fund to add or to change unaffiliated subadvisers or to change the fees paid to such subadvisers from time to time without the expense and delays associated with obtaining shareholder approval of the change. The Investment Manager and its affiliates may have other relationships, including significant financial relationships, with current or potential subadvisers or their affiliates, which may create certain conflicts of interest. When making recommendations to the Board to appoint or to change a subadviser, or to change the terms of a subadvisory agreement, the Investment Manager discloses to the Board the nature of any such material relationships. At present, the Investment Manager has not engaged any investment subadviser for the Fund.

The Fund pays the Investment Manager a fee for its management services, which include investment advisory services and administrative services. The fee is calculated as a percentage of the average daily net assets of the Fund and is paid monthly. Prior to July 1, 2015, the Fund paid the Investment Manager an advisory fee under an investment management services agreement and a separate administrative fee under an administrative services agreement. For the Fund’s most recent fiscal year, aggregate fees paid to the Investment Manager by the Fund under the investment management services agreement and the management agreement amounted to 0.78% of average daily net assets of the Fund. A discussion regarding the basis for the Board’s approval of the renewal of the Fund's investment management services agreement and the combination of the Fund's investment management services agreement with the Fund's administrative services agreement into the Fund's management agreement, each with the Investment Manager, is available in the Fund’s semiannual report to shareholders for the fiscal period ended August 31, 2015.

Portfolio Managers

Information about the portfolio managers primarily responsible for overseeing the Fund’s investments is shown below. The SAI provides additional information about the portfolio managers, including information relating to compensation, other accounts managed by the portfolio managers, and ownership by the portfolio managers of Fund shares.

    

Mr. King joined the Investment Manager in 2010. Mr. King began his investment career in 1983 and earned a B.S. from the University of New Hampshire and an M.B.A. from Harvard Business School.

Mr. Jin joined one of the Columbia Management legacy firms or acquired business lines in 2002. Mr. Jin began his investment career in 1998 and earned a M.A. in economics from North Carolina State University.

20	Prospectus 2016

Columbia Convertible Securities Fund

More Information About the Fund (continued)

The Distributor

Shares of the Fund are distributed by Columbia Management Investment Distributors, Inc., which is located at 225 Franklin Street, Boston, MA 02110. The Distributor is a registered broker-dealer and an indirect, wholly-owned subsidiary of Ameriprise Financial. The Distributor and its affiliates may pay commissions, distribution and service fees and/or other compensation to entities, including Ameriprise Financial affiliates, for selling shares and providing services to investors.

The Transfer Agent

Columbia Management Investment Services Corp. is a registered transfer agent and wholly-owned subsidiary of Ameriprise Financial. The Transfer Agent is located at 225 Franklin Street, Boston, MA 02110, and its responsibilities include processing purchases, redemptions and exchanges of Fund shares, calculating and paying distributions, maintaining shareholder records, preparing account statements and providing customer service. The Transfer Agent has engaged DST Systems, Inc., including its affiliate, Boston Financial Data Services, Inc., to provide various shareholder or “sub-transfer agency” services. In addition, the Transfer Agent enters into agreements with various financial intermediaries through which you may hold Fund shares, pursuant to which the Transfer Agent pays these financial intermediaries for providing certain shareholder services. The Fund generally pays the Transfer Agent a per account fee, pays a fee based on the assets invested through omnibus accounts and reimburses the Transfer Agent for certain out-of-pocket expenses.

Other Roles and Relationships of Ameriprise Financial and its Affiliates — Certain Conflicts of Interest

The Investment Manager, Distributor and Transfer Agent, all affiliates of Ameriprise Financial, provide various services to the Fund and other Columbia Funds for which they are compensated. Ameriprise Financial and its other affiliates may also provide other services to these funds and be compensated for them.

The Investment Manager and its affiliates may provide investment advisory and other services to other clients and customers substantially similar to those provided to the Columbia Funds. These activities, and other financial services activities of Ameriprise Financial and its affiliates, may present actual and potential conflicts of interest and introduce certain investment constraints.

Ameriprise Financial is a major financial services company, engaged in a broad range of financial activities beyond the mutual fund-related activities of the Investment Manager, including, among others, insurance, broker-dealer (sales and trading), asset management, banking and other financial activities. These additional activities may involve multiple advisory, financial, insurance and other interests in securities and other instruments, and in companies that issue securities and other instruments, that may be bought, sold or held by the Columbia Funds.

Conflicts of interest and limitations that could affect a Columbia Fund may arise from, for example, the following:

■	compensation and other benefits received by the Investment Manager and other Ameriprise Financial affiliates related to the management/administration of a Columbia Fund and the sale of its shares;

■	the allocation of, and competition for, investment opportunities among the Fund, other funds and accounts advised/managed by the Investment Manager and other Ameriprise Financial affiliates, or Ameriprise Financial itself and its affiliates;

■	separate and potentially divergent management of a Columbia Fund and other funds and accounts advised/managed by the Investment Manager and other Ameriprise Financial affiliates;

■	regulatory and other investment restrictions on investment activities of the Investment Manager and other Ameriprise Financial affiliates and accounts advised/managed by them;

■	insurance and other relationships of Ameriprise Financial affiliates with companies and other entities in which a Columbia Fund invests; and

■	regulatory and other restrictions relating to the sharing of information between Ameriprise Financial and its affiliates, including the Investment Manager, and a Columbia Fund.

Prospectus 2016

21

Columbia Convertible Securities Fund

More Information About the Fund (continued)

The Investment Manager and Ameriprise Financial have adopted various policies and procedures that are intended to identify, monitor and address conflicts of interest. However, there is no assurance that these policies, procedures and disclosures will be effective.

Additional information about Ameriprise Financial and the types of conflicts of interest and other matters referenced above is set forth in the Investment Management and Other Services — Other Roles and Relationships of Ameriprise Financial and its Affiliates — Certain Conflicts of Interest section of the SAI. Investors in the Columbia Funds should carefully review these disclosures and consult with their financial advisor if they have any questions.

Certain Legal Matters

Ameriprise Financial and certain of its affiliates have historically been involved in a number of legal, arbitration and regulatory proceedings, including routine litigation, class actions and governmental actions, concerning matters arising in connection with the conduct of their business activities. Ameriprise Financial believes that the Fund is not currently the subject of, and that neither Ameriprise Financial nor any of its affiliates are the subject of, any pending legal, arbitration or regulatory proceedings that are likely to have a material adverse effect on the Fund or the ability of Ameriprise Financial or its affiliates to perform under their contracts with the Fund. Information regarding certain pending and settled legal proceedings may be found in the Fund’s shareholder reports and in the SAI. Additionally, Ameriprise Financial is required to make quarterly (10-Q), annual (10-K) and, as necessary, 8-K filings with the SEC on legal and regulatory matters that relate to Ameriprise Financial and its affiliates. Copies of these filings may be obtained by accessing the SEC website at sec.gov.

22	Prospectus 2016

Columbia Convertible Securities Fund

Choosing a Share Class

The Funds

The Columbia Funds (referred to as the Funds) generally share the same policies and procedures for investor services, as described below. Each Fund is a series of Columbia Funds Series Trust (CFST), Columbia Funds Series Trust I (CFST I) or Columbia Funds Series Trust II (CFST II), and certain features of distribution and/or service plans may differ among these trusts. The Fund offered by this prospectus is a series of CFST. Columbia Funds with names that include the words “Tax-Exempt,” “Municipal” or “Muni” (the Tax-Exempt Funds) have certain policies that differ from other Columbia Funds (the Taxable Funds). The Fund offered by this prospectus is a Taxable Fund.

Funds Contact Information

Additional information about the Funds can be obtained at columbiathreadneedle.com/us,* by calling toll-free 800.345.6611, or by writing (regular mail) to Columbia Management Investment Services Corp., P.O. Box 8081, Boston, MA 02266-8081 or (express mail) Columbia Management Investment Services Corp., c/o Boston Financial, 30 Dan Road, Suite 8081, Canton, MA 02021-2809.

*	The website references in this prospectus are inactive links and information contained in or otherwise accessible through the referenced websites does not form a part of this prospectus.

With limited exceptions, the Fund will no longer accept new investors at the time that the Fund’s total assets under management reach $2 billion. For more information, see Buying, Selling and Exchanging Shares — Opening an Account and Placing Orders — Fund Closing.

Summary of Share Class Features

Each share class has its own investment eligibility criteria, cost structure and other features. You may not be eligible for every share class. If you purchase shares of a Fund through a retirement plan or other product or program offered by your selling agent, not all share classes of the Fund may be made available to you. When deciding which class of shares to buy, you should consider, among other things:

■	The amount you plan to invest.

■	How long you intend to remain invested in the Fund.

■	The expenses for each share class.

Prospectus 2016

23

Columbia Convertible Securities Fund

Choosing a Share Class (continued)

■	Whether you may be eligible for a reduction or waiver of sales charges when you buy or sell shares.

Each investor's personal situation is different and you may wish to discuss with your selling agent which share classes are available to you and which share class is appropriate for you.

The following summarizes the primary features of Class A, Class B, Class C, Class I, Class K, Class R, Class R4, Class R5, Class T, Class W, Class Y and Class Z shares.

Not all Funds offer every class of shares. The Fund offers the class(es) of shares set forth on the cover of this prospectus and may offer other share classes through a separate prospectus. Although certain share classes are generally closed to new or existing investors, information relating to these share classes is included in the table below because certain qualifying purchase orders are permitted, as described below.

24	Prospectus 2016

26	Prospectus 2016

Columbia Convertible Securities Fund

Choosing a Share Class (continued)

•   Class R5 Shares . Shareholders with Class R5 accounts funded before November 8, 2012 who do not satisfy the current eligibility criteria for Class R5 shares may not establish new Class R5 accounts but may continue to make additional purchases of Class R5 shares in existing accounts. In addition, investment advisory programs and similar programs that opened a Class R5 account as of May 1, 2010 and continuously hold Class R5 shares in such account after such date, may generally not only continue to make additional purchases of Class R5 shares but also open new Class R5 accounts for such pre-existing programs and add new shareholders in the program.

•   Class T Shares. Shareholders with Class T accounts who received, and have continuously held, Class T shares in connection with the merger of certain Galaxy funds into certain Funds that were then named Liberty funds may continue to make additional purchases of such share class.

•   Class Y Shares . Shareholders with Class Y accounts funded before November 8, 2012 who do not satisfy the current eligibility criteria for Class Y shares may not establish new accounts for such share class but may continue to make additional purchases of Class Y shares in existing accounts.

•   Class Z Shares . Effective March 29, 2013, selling agents that clear Fund share transactions through designated selling agents and their mutual fund trading platforms that have been given specific written notice from the Transfer Agent of the termination of their eligibility for new purchases of Class Z shares and omnibus retirement plans are no longer permitted to establish new Class Z accounts, subject to certain exceptions. Omnibus retirement plans that opened and, subject to exceptions, funded a Class Z account as of close of business on March 28, 2013 and continuously hold Class Z shares in such account after such date, may generally continue to make additional purchases of Class Z shares, open new Class Z accounts and add new participants. In certain circumstances and in the sole discretion of the Distributor, omnibus retirement plans affiliated with a grandfathered plan may also open new Class Z accounts. Accounts of selling agents (other than omnibus retirement plans) that clear Fund share transactions for their client or customer accounts through designated selling agents and their mutual fund trading platforms are not permitted to establish new Class Z accounts or make additional purchases of Class Z shares (other than through reinvestment of distributions).

(g)

Timing of conversion and CDSC schedules will vary depending on the Fund and the date of your original purchase of Class B shares. For more information on the conversion of Class B shares to Class A shares, see Choosing a Share Class — Sales Charges and Commissions. Class B shares of Columbia Short Term Municipal Bond Fund do not charge a CDSC and do not convert to Class A shares.

(h)	If you are eligible to invest in Class A shares without a front-end sales charge, you should discuss your options with your selling agent. For more information, see Choosing a Share Class – Reductions/Waivers of Sales Charges.

Sales Charges and Commissions

Sales charges, commissions and distribution and service fees (discussed in a separate sub-section below) compensate selling agents (typically your financial advisor) for selling shares to you and for maintaining and servicing the shares held in your account with them. These charges, commissions and fees are intended to provide incentives for selling agents to provide such services. Depending on which share class you choose you will pay these charges either at the outset as a front-end sales charge, at the time you sell your shares as a CDSC and/or over time in the form of increased ongoing fees.

Whether the ultimate cost is higher for one class over another depends on the amount you invest, how long you hold your shares and whether you are eligible for reduced or waived sales charges. The differential between classes also will vary depending on the actual investment return for any given investment period. You are responsible for choosing the share class most appropriate for you after taking into account your share class eligibility and the value of accounts that you are eligible to include for the right of accumulation, which may reduce or eliminate otherwise applicable sales charges. For more information, see Choosing a Share Class – Reductions/Waivers of Sales Charges . We encourage you to consult with a financial advisor who can help you with your investment decisions.

Class A Shares — Front-End Sales Charge

You'll pay a front-end sales charge when you buy Class A shares (other than shares of Columbia Money Market Fund and certain other Funds), resulting in a smaller dollar amount being invested in a Fund than the purchase price you pay, unless you qualify for a waiver of the sales charge or you buy the shares through reinvested distributions. For more information, see Choosing a Share Class — Reductions/Waivers of Sales Charges.

The Distributor receives the sales charge and re-allows (or pays) a portion of the sales charge to the selling agent through which you purchased the shares. The Distributor retains the balance of the sales charge. The Distributor retains the full sales charge you pay when you purchase shares of the Fund directly from the Fund (through the Transfer Agent, rather than through a selling agent). Sales charges vary depending on the amount of your purchase.

28	Prospectus 2016

Columbia Convertible Securities Fund

Choosing a Share Class (continued)

■	The net asset value (or NAV) per share is the price of a share calculated by the Fund every business day.
■	The offering price per share is the NAV per share plus any front-end sales charge that applies.

The front-end sales charge you'll pay on Class A shares:

■	depends on the amount you're investing (generally, the larger the investment, the smaller the percentage sales charge), and

■	is based on the total amount of your purchase and the value of your account (and any other accounts eligible for aggregation of which you or your selling agent notifies the Fund).

    

Class A Shares — Front-End Sales Charge — Breakpoint Schedule*
Breakpoint Schedule For:	Dollar amount of shares bought (a)	Sales charge as a % of the offering price (b)	Sales charge as a % of the net amount invested (b)	Amount retained by or paid to selling agents as a % of the offering price
Equity Funds, Columbia Adaptive Alternatives Fund, Columbia Adaptive Risk Allocation Fund, Columbia Commodity Strategy Fund, Columbia Diversified Absolute Return Fund and Funds-of-Funds (equity)*	$ 0–$49,999	5.75%	6.10%	5.00%
	$ 50,000–$99,999	4.50%	4.71%	3.75%
	$100,000–$249,999	3.50%	3.63%	3.00%
	$250,000–$499,999	2.50%	2.56%	2.15%
	$500,000–$999,999	2.00%	2.04%	1.75%
	$ 1,000,000 or more	0.00%	0.00%	0.00% (c)
Fixed Income Funds (except those listed below), Columbia Multi-Asset Income Fund and Funds-of-Funds (fixed income)*	$ 0-$49,999	4.75%	4.99%	4.00%
	$ 50,000–$99,999	4.25%	4.44%	3.50%
	$100,000–$249,999	3.50%	3.63%	3.00%
	$250,000–$499,999	2.50%	2.56%	2.15%
	$500,000–$999,999	2.00%	2.04%	1.75%
	$ 1,000,000 or more	0.00%	0.00%	0.00% (c)
Tax-Exempt Funds (other than Columbia Short Term Municipal Bond Fund)	$ 0-$99,999	3.00%	3.09%	2.50%
	$100,000–$249,999	2.50%	2.56%	2.15%
	$250,000–$499,999	1.50 %	1.53%	1.25%
	$ 500,000 or more	0.00%	0.00%	0.00% (c)

Prospectus 2016

29

Columbia Convertible Securities Fund

Choosing a Share Class (continued)

will incur a CDSC of 0.50% if you redeem those shares within 12 months after purchase. Subsequent Class A share purchases made on or after February 19, 2015 that bring your aggregate account value to $500,000 or more will also be subject to a CDSC of 0.50% if you redeem them within 12 months after purchase.

■

If you purchased Class A shares of any Tax-Exempt Fund prior to February 19, 2015 without an initial sales charge because your accounts aggregated between $1 million and $50 million at the time of purchase, you will incur a CDSC if you redeem those shares within 18 months after purchase, which is charged as follows: 1.00% CDSC if shares are redeemed within 12 months after purchase; and 0.50% CDSC if shares are redeemed more than 12, but less than 18, months after purchase. Subsequent Class A share purchases made prior to February 19, 2015 that bring your aggregate account value to $1 million or more (but less than $50 million) will also be subject to a CDSC if you redeem them within 18 months after purchase as described in this paragraph.

Taxable Funds

■

If you purchased Class A shares of any Taxable Fund without an initial sales charge because your accounts aggregated between $1 million and $50 million at the time of purchase, you will incur a CDSC if you redeem those shares within 18 months after purchase, which is charged as follows: 1.00% CDSC if shares are redeemed within 12 months after purchase; and 0.50% CDSC if shares are redeemed more than 12, but less than 18, months after purchase. Subsequent Class A share purchases that bring your aggregate account value to $1 million or more (but less than $50 million) will also be subject to a CDSC if you redeem them within 18 months after purchase as described in this paragraph.

Class A Shares — Commissions

The Distributor may pay your selling agent an up-front commission when you buy Class A shares. The Distributor generally funds the commission through the applicable sales charge paid by you. For more information, see Class A Shares — Front-End Sales Charge — Breakpoint Schedule.

The Distributor may also pay your selling agent a cumulative commission when you buy Class A shares in amounts not subject to initial sales charges, according to the following schedule:

    

Class A Shares of Tax-Exempt Funds — Commission Schedule (Paid by the Distributor to Selling Agents)
Purchase Amount	Commission Level* (as a % of net asset value per share)
$500,000 – $3,999,999	0.75%**
$4 million – $19,999,999	0.50%
$20 million or more	0.25%

Prospectus 2016

31

Columbia Convertible Securities Fund

Choosing a Share Class (continued)

*	The commission level applies to the applicable asset level so, for example, for a purchase of $5 million, the Distributor would pay a commission of 0.75% on the first $4 million and 0.50% on the remaining $1 million.

**	The commission level on purchases of Class A shares of Columbia Short Term Municipal Bond Fund is: 0.50% on purchases of $500,000 to $19,999,999 and 0.25% on purchases of $20 million or more.

    

Class A Shares of Taxable Funds — Commission Schedule (Paid by the Distributor to Selling Agents)*
Purchase Amount	Commission Level** (as a % of net asset value per share)
$1 million – $2,999,999	1.00%
$3 million – $49,999,999	0.50%
$50 million or more	0.25%

*	Not applicable to Funds that do not assess a front-end sales charge.

**	The commission level applies to the applicable asset level so, for example, for a purchase of $5 million, the Distributor would pay a commission of 1.00% on the first $3 million and 0.50% on the remaining $2 million.

Class B Shares — Sales Charges

The Funds no longer accept new investments in Class B shares, except for certain limited transactions as described in more detail under Buying, Selling and Exchanging Shares — Buying Shares — Eligible Investors — Class B Shares (Closed).

You don't pay a front-end sales charge when you buy Class B shares, but you may pay a CDSC when you sell Class B shares.

Class B Shares — CDSC

You'll pay a CDSC if you sell Class B shares unless you qualify for a waiver of the CDSC or the shares you're selling were bought through reinvested distributions. See Choosing a Share Class — Reductions/Waivers of Sales Charges for details. The CDSC you pay on Class B shares depends on how long you've held your shares and generally declines each year until there is no sales charge, as follows:

    

Class B Shares — CDSC Schedule for the Funds (except those listed below)
Number of Years Class B Shares Held	Applicable CDSC*
One	5.00%
Two	4.00%
Three	3.00%
Four	3.00%
Five	2.00%
Six	1.00%
Seven	None
Eight	None
Nine	Conversion to Class A Shares

*	Because of rounding in the calculation, the actual CDSC you pay may be more or less than the CDSC calculated using these percentages.

    

32	Prospectus 2016

Columbia Convertible Securities Fund

Choosing a Share Class (continued)

Class C Shares — Commissions

Although there is no front-end sales charge when you buy Class C shares, the Distributor pays an up-front commission directly to your selling agent of up to 1.00% of the NAV per share when you buy Class C shares (a portion of this commission may be paid to your financial advisor). The Distributor seeks to recover this commission through distribution fees it receives under the Fund's distribution and/or service plan and any applicable CDSC applied when you sell your shares. For more information, see Choosing a Share Class — Distribution and Service Fees.

Class R Shares — Sales Charges and Commissions

You don't pay a front-end sales charge when you buy Class R shares or a CDSC when you sell Class R shares. The Distributor pays an up-front commission directly to your selling agent when you buy Class R shares (a portion of this commission may be paid to your financial advisor), according to the following schedule:

    

Class R Shares — Commission Schedule (Paid by the Distributor to Selling Agents)
Purchase Amount	Commission Level (as a % of net asset value per share)
$0 – $49,999,999	0.50%
$50 million or more	0.25%

The Distributor seeks to recover this commission through distribution fees it receives under the Fund's distribution plan. For more information, see Choosing a Share Class — Distribution and Service Fees.

Class T Shares — Front-End Sales Charge

You'll pay a front-end sales charge when you buy Class T shares, resulting in a smaller dollar amount being invested in a Fund than the purchase price you pay, unless you qualify for a waiver of the sales charge or you buy the shares through reinvested distributions. For more information, see Choosing a Share Class — Reductions/Waivers of Sales Charges.

The front-end sales charge you'll pay on Class T shares:

■	depends on the amount you're investing (generally, the larger the investment, the smaller the percentage sales charge), and

■	is based on the total amount of your purchase and the value of your account (and any other accounts eligible for aggregation of which you or your selling agent notifies the Fund).

    

Class T Shares — Front-End Sales Charge — Breakpoint Schedule
Breakpoint Schedule For:	Dollar amount of shares bought (a)	Sales charge as a % of the offering price (b)	Sales charge as a % of the net amount invested (b)	Amount retained by or paid to selling agents as a % of the offering price
Equity Funds	$ 0–$49,999	5.75%	6.10%	5.00%
	$ 50,000–$99,999	4.50%	4.71%	3.75%
	$100,000–$249,999	3.50%	3.63%	2.75%
	$250,000–$499,999	2.50%	2.56%	2.00%
	$500,000–$999,999	2.00%	2.04%	1.75%
	$ 1,000,000 or more	0.00%	0.00%	0.00% (c)

34	Prospectus 2016

Columbia Convertible Securities Fund

Choosing a Share Class (continued)

Reductions/Waivers of Sales Charges

Front-End Sales Charge Reductions

There are two ways in which you may be able to reduce the front-end sales charge that you may pay when you buy Class A shares or Class T shares of a Fund. These types of sales charge reductions are also referred to as breakpoint discounts.

First, through the right of accumulation (ROA), you may combine the value of eligible accounts (as described in the Eligible Accounts section below) maintained by you and members of your immediate family to reach a breakpoint discount level and apply a lower sales charge to your purchase. To calculate the combined value of your Fund accounts in the particular class of shares, the Fund will use the current public offering price per share. For purposes of obtaining a breakpoint discount through ROA, you may aggregate your and your immediate family members' ownership (as described in the FUNDamentals box below) of certain classes of shares held in certain account types, as described in the Eligible Accounts section below.

Second, by making a statement of intent to purchase additional shares (commonly referred to as a letter of intent (LOI)), you may pay a lower sales charge on all purchases of Class A shares or Class T shares made within 13 months after the date of your LOI. Your LOI must state the aggregate amount of purchases you intend to make in that 13-month period, which must be at least enough to reach the first (or next) breakpoint of the Fund. The required form of LOI may vary by selling agent, so please contact them directly for more information. Five percent of the purchase commitment amount will be placed in escrow. At the end of the 13-month period, the shares will be released from escrow, provided that you have invested the commitment amount. If you do not invest the commitment amount by the end of the 13 months, the remaining amount of the unpaid sales charge will be redeemed from the escrowed shares and the remaining balance released from escrow. To calculate the total value of the purchases you've made under an LOI, the Fund will use the historic cost (i.e., dollars invested and not current market value) of the shares held in each eligible account; reinvested dividends or capital gains, or purchases made through the reinstatement privilege do not count as purchases made under an LOI. For purposes of making an LOI to purchase additional shares, you may aggregate eligible shares owned by you or your immediate family members in eligible accounts, valued as of the day immediately before the initiation of your LOI.

You must request the reduced sales charge (whether through ROA or an LOI) when you buy shares. If you do not complete and file an LOI, or do not request the reduced sales charge at the time of purchase, you will not be eligible for the reduced sales charge. To obtain a breakpoint discount, you must notify your selling agent in writing at the time you buy your shares of each eligible account maintained by you and members of your immediate family, including accounts maintained through different selling agents. You and your selling agent are responsible for ensuring that you receive discounts for which you are eligible. The Fund is not responsible for a selling agent's failure to apply the eligible discount to your account. You may be asked by your selling agent for account statements or other records to verify your discount eligibility, including, when applicable, records for accounts opened with a different selling agent and records of accounts established by members of your immediate family.

36	Prospectus 2016

Columbia Convertible Securities Fund

Choosing a Share Class (continued)

Eligible Accounts

The following accounts are eligible for account value aggregation as described above, provided that they are invested in Class A, Class B, Class C, Class E, Class F, Class T, Class W or Class Z shares of a Fund, or non-retirement plan accounts invested in Class R4 or Class R5 shares of a Fund: individual or joint accounts; Roth and traditional Individual Retirement Accounts (IRAs); Simplified Employee Pension accounts (SEPs), Savings Investment Match Plans for Employees of Small Employers accounts (SIMPLEs) and Tax Sheltered Custodial Accounts (TSCAs); Uniform Gifts to Minors Act (UGMA)/Uniform Transfers to Minors Act (UTMA) accounts for which you, your spouse, or your domestic partner is parent or guardian of the minor child; revocable trust accounts for which you or an immediate family member, individually, is the beneficial owner/grantor; accounts held in the name of your, your spouse’s, or your domestic partner’s sole proprietorship or single owner limited liability company or S corporation; qualified retirement plan assets, provided that you are the sole owner of the business sponsoring the plan, are the sole participant (other than a spouse) in the plan, and have no intention of adding participants to the plan; and investments in wrap accounts.

The following accounts are not eligible for account value aggregation as described above: accounts of pension and retirement plans with multiple participants, such as 401(k) plans (which are combined to reduce the sales charge for the entire pension or retirement plan and therefore are not used to reduce the sales charge for your individual accounts); investments in 529 plans, donor advised funds, variable annuities, variable insurance products or managed separate accounts; charitable and irrevocable trust accounts; accounts holding shares of money market funds that used the Columbia brand before May 1, 2010; accounts invested in Class I, Class K, Class R or Class Y shares of a Fund; and retirement plan accounts invested in Class R4 or Class R5 shares of a Fund.

Additionally, direct purchases of Columbia Money Market Fund shares may not be aggregated; however, shares of Columbia Money Market Fund acquired by exchange from other Funds may be included in account value aggregation.

Front-End Sales Charge Waivers

The Distributor may waive front-end sales charges on purchases of Class A and Class T shares of the Funds by certain categories of investors, including Board members, certain employees of selling agents, Fund portfolio managers and certain retirement and employee benefit plans. The Distributor may waive front-end sales charges on (i) purchases (including exchanges) of Class A shares in accounts of selling agents that have entered into agreements with the Distributor to offer Fund shares to self-directed investment brokerage accounts that may or may not charge a transaction fee to customers and (ii) exchanges of Class Z shares of a Fund for Class A shares of the Fund. For a more complete description of categories of investors who may purchase Class A and Class T shares of the Funds at NAV, without payment of any front-end sales charge that would otherwise apply, see Appendix S to the SAI. In addition, certain types of purchases of Class A and Class T shares may be made at NAV. For a description of these eligible transactions, see Appendix S to the SAI.

CDSC Waivers

You may be able to avoid an otherwise applicable CDSC when you sell Class A, Class B, Class C or Class T shares of the Fund. This could happen because of the way in which you originally invested in the Fund, because of your relationship with the Funds or for other reasons. For example, the CDSC will be waived on redemptions of shares in the event of the shareholder's death; that result from required minimum distributions taken from retirement accounts when the shareholder reaches age 70½; in connection with the Fund's Small Account Policy (which is described in Buying, Selling and Exchanging Shares — Transaction Rules and Policies ); and by certain other investors and in certain other types of transactions. For a more complete description of the available waivers of the CDSC on redemptions of Class A, Class B, Class C or Class T shares, see Appendix S to the SAI.

Repurchases

Investors can also buy Class A shares without paying a sales charge if the purchase is made from the proceeds of a redemption of any Class A, Class B, Class C or Class T shares of a Fund (other than Columbia Money Market Fund) within 90 days, up to the amount of the redemption proceeds. Any CDSC paid upon redemption of your Class A, Class B, Class C or Class T shares of a Fund will not be reimbursed.

Prospectus 2016

37

Columbia Convertible Securities Fund

Choosing a Share Class (continued)

To be eligible for the reinstatement privilege, the purchase must be made into an account for the same owner, but does not need to be into the same Fund from which the shares were sold. The Transfer Agent, Distributor or their agents must receive a written reinstatement request from you or your selling agent within 90 days after the shares are redeemed and the purchase of Class A shares through this reinstatement privilege will be made at the NAV of such shares next calculated after the request is received in “good form.” The repurchased shares will be deemed to have the original purchase date for purposes of applying the CDSC (if any) to subsequent redemptions. Systematic withdrawals and purchases are excluded from this policy.

Restrictions and Changes in Terms and Conditions

Restrictions may apply to certain accounts and certain transactions. The Funds may change or cancel these terms and conditions at any time. Unless you provide your selling agent with information in writing about all of the factors that may count toward a waiver of a sales charge, there can be no assurance that you will receive all of the waivers for which you may be eligible. You should request that your selling agent provide this information to the Fund when placing your purchase order. Please see Appendix S of the SAI for more information about the sales charge reductions and waivers.

Distribution and Service Fees

The Board has approved, and the Funds have adopted, distribution and/or shareholder service plans which set the distribution and/or service fees that are periodically deducted from the Funds’ assets. These fees are calculated daily, may vary by share class and are intended to compensate the Distributor and/or eligible selling agents for selling Fund shares and directly or indirectly providing services to shareholders. Because the fees are paid out of the Fund's assets on an ongoing basis, they will increase the cost of your investment over time.

The table below shows the maximum annual distribution and/or service fees (as an annual % of average daily net assets) and the combined amount of such fees applicable to each share class:

    

(a)	The maximum distribution and service fees of Class A shares varies among the Funds, as shown in the table below:

    

38	Prospectus 2016

Columbia Convertible Securities Fund

Choosing a Share Class (continued)

shares, which, prior to the close of business on September 3, 2010, were known as Class R2 shares. For Class R shares of series of CFST II, the maximum fee under the plan reimbursed for distribution expenses is equal on an annual basis to 0.50% of the average daily net assets of the Fund attributable to Class R shares. Of that amount, up to 0.25% may be reimbursed for shareholder service expenses.

(h)

The shareholder servicing fees for Class T shares are up to 0.50% of average daily net assets attributable to Class T shares for equity Funds and 0.40% for fixed income Funds. In general, the Funds currently limit such fees to a maximum of 0.25% for equity Funds and 0.15% for fixed-income Funds. These fees for Class T shares are not paid pursuant to a 12b-1 plan. See Class T Shareholder Service Fees below for more information.

The distribution and/or service fees for Class A, Class B, Class C, Class R and Class W shares, as applicable, may be subject to the requirements of Rule 12b-1 under the 1940 Act. The Distributor may retain these fees otherwise payable to selling agents if the amounts due are below an amount determined by the Distributor in its sole discretion.

For Class A (with the exception noted in the next sentence), Class B, Class R and Class W shares, the Distributor begins to pay these fees immediately after purchase. For Class A shares (if purchased as part of a purchase of shares of $1 million or more for Taxable Funds or $500,000 or more for Tax-Exempt Funds) and for Class C shares (with the exception noted in the next sentence), the Distributor begins to pay these fees 12 months after purchase. For Class C shares, selling agents may opt to decline payment of sales commission and, instead, may receive these fees immediately after purchase. For Class B shares and for the first 12 months following the sale of Class C shares, the Distributor retains the distribution fee of up to 0.75% in order to finance the payment of sales commissions to selling agents and to pay for other distribution related expenses. Selling agents may compensate their financial advisors with the shareholder service and distribution fees paid to them by the Distributor.

Series of CFST II. The maximum fee for services under the distribution and/or shareholder servicing plan for series of CFST II is the lesser of the amount of reimbursable expenses and the fee rates in the table above. If a share class of a series of CFST II has no reimbursable distribution or shareholder servicing expenses, it will suspend the payment of any such fee.

If you maintain shares of the Fund directly with the Fund, without working with a financial advisor or other selling agent, distribution and service fees may be retained by the Distributor as payment or reimbursement for incurring certain distribution and shareholder service related expenses.

Over time, these distribution and/or service fees will reduce the return on your investment and may cost you more than paying other types of sales charges. The Fund will pay these fees to the Distributor and/or to eligible selling agents for as long as the distribution plan and/or shareholder servicing plans continue in effect, which is expected to be indefinitely. The Fund may reduce or discontinue payments at any time. Your selling agent may also charge you other additional fees for providing services to your account, which may be different from those described here.

Class K Plan Administration Services Fee

Class K shares pay an annual plan administration services fee for the provision of various administrative, recordkeeping, communication and educational services, including services such as implementation and conversion services, account set-up and maintenance, reconciliation and account recordkeeping, education services and administration to various plan types, including 529 plans, retirement plans and health savings accounts. The fee for Class K shares is equal on an annual basis to 0.25% of average daily net assets attributable to the class. These fees for Class K shares are not paid pursuant to a 12b-1 plan. The Distributor pays these fees as applicable.

Class T Shareholder Services Fees

The Funds that offer Class T shares have adopted a shareholder services plan that permits them to pay for certain services provided to Class T shareholders by their selling agents. Equity Funds may pay shareholder servicing fees up to an aggregate annual rate of 0.50% of the Fund's average daily net assets attributable to Class T shares (comprised of up to 0.25% for shareholder liaison services and up to 0.25% for administrative support services). Fixed income Funds may pay shareholder servicing fees up to an aggregate annual rate of 0.40% of the Fund's average daily net assets attributable to Class T shares (comprised of up to 0.20% for shareholder liaison services and up to 0.20% for administrative support services). These fees are currently limited to an aggregate annual rate of not more than 0.25% for equity Funds and not more than 0.15% for fixed income Funds. The Distributor begins to pay these fees immediately after purchase for purchases up to $1 million, for purchases of $1 million or more the Distributor will begin to pay these fees 12 months after purchase. These fees for Class T shares are not paid pursuant to a 12b-1 plan. With respect to those Funds that declare dividends on a daily basis, the shareholder

40	Prospectus 2016

Columbia Convertible Securities Fund

Choosing a Share Class (continued)

servicing fee shall be waived by the selling agents to the extent necessary to prevent net investment income from falling below 0% on a daily basis. If you maintain shares of the Fund directly with the Fund, without working with a financial advisor or other intermediary, shareholder services fees may be retained by the Distributor as payment or reimbursement for incurring certain shareholder service related expenses.

Selling Agent Compensation

The Distributor, the Investment Manager and their affiliates make payments, from their own resources, to selling agents, including other Ameriprise Financial affiliates, for marketing/sales support services relating to the Funds (Marketing Support Payments). Such payments are generally based upon one or more of the following factors: average net assets of the Funds sold by the Distributor attributable to that selling agent; gross sales of the Funds distributed by the Distributor attributable to that selling agent; reimbursement of ticket charges (fees that a selling agent charges its representatives for effecting transactions in Fund shares); or a negotiated lump sum payment. While the financial arrangements may vary for each selling agent, Marketing Support Payments to any one selling agent are generally between 0.05% and 0.40% on an annual basis for payments based on average net assets of the Fund attributable to the selling agent, and between 0.05% and 0.25% on an annual basis for firms receiving a payment based on gross sales of the Funds attributable to the selling agent. The Distributor, the Investment Manager and their affiliates may make payments in larger amounts or on a basis other than those described above when dealing with certain selling agents, including certain affiliates of Bank of America Corporation (Bank of America). Such increased payments may enable such selling agents to offset credits that they may provide to customers. The Distributor, the Investment Manager and their affiliates do not make Marketing Support Payments with respect to Class Y shares; provided, however, that such payments are made to Bank of America with respect to Class Y shares of Columbia Bond Fund, Columbia Global Dividend Opportunity Fund, Columbia Income Opportunities Fund, Columbia Large Cap Enhanced Core Fund, Columbia Mid Cap Growth Fund, Columbia Mid Cap Value Fund, Columbia Select International Equity Fund, Columbia Short Term Bond Fund, Columbia Small Cap Growth Fund I and Columbia Small Cap Value Fund I.

In addition, the Transfer Agent has certain arrangements in place to compensate selling agents, including other Ameriprise Financial affiliates, that hold Fund shares through omnibus accounts, including omnibus retirement plans, for services that they provide to beneficial shareholders (Shareholder Services). Shareholder Services vary by selling agent and according to distribution channel and may include sub-accounting, sub-transfer agency, participant recordkeeping, shareholder or participant reporting, shareholder or participant transaction processing, maintenance of shareholder records, preparation of account statements and provision of customer service. Payments for Shareholder Services also vary by selling agent and according to distribution channel, but generally are not expected, with certain limited exceptions, to exceed 0.40% of the average aggregate value of the Fund’s shares. Generally, each Fund (other than the Columbia Acorn Funds) pays a percentage of the average aggregate value of shares maintained in omnibus accounts: up to 0.20% for all share classes other than Class I, K, R5 and Y shares; 0.05% for Class K and R5 shares; and 0% for Class I and Y shares. The amounts in excess of that reimbursed by the Fund are borne by the Distributor, the Investment Manager and/or their affiliates. The Transfer Agent does not pay selling agents for Shareholder Services and the Fund does not pay the Transfer Agent for any Shareholder Services provided by selling agents, with respect to Class Y shares.

In addition to the payments described above, the Distributor, the Investment Manager and their affiliates may make other payments or allow promotional incentives to broker-dealers to the extent permitted by SEC and Financial Industry Regulatory Authority (FINRA) rules and by other applicable laws and regulations.

Amounts paid by the Distributor, the Investment Manager and their affiliates are paid out of their own resources and do not increase the amount paid by you or the Fund. You can find further details in the SAI about the payments made by the Distributor, the Investment Manager and their affiliates, as well as a list of the selling agents, including Ameriprise Financial affiliates, to which the Distributor and the Investment Manager have agreed to make Marketing Support Payments and pay Shareholder Services fees.

Prospectus 2016

41

Columbia Convertible Securities Fund

Choosing a Share Class (continued)

Your selling agent may charge you fees and commissions in addition to those described in this prospectus. You should consult with your selling agent and review carefully any disclosure your selling agent provides regarding its services and compensation. Depending on the financial arrangement in place at any particular time, a selling agent and its financial advisors may have a financial incentive for recommending the Fund or a particular share class over others.

42	Prospectus 2016

Columbia Convertible Securities Fund

Columbia Convertible Securities Fund

Buying, Selling and Exchanging Shares (continued)

Fair valuation may have the effect of reducing stale pricing arbitrage opportunities presented by the pricing of Fund shares. However, when the Fund uses fair valuation to price securities, it may value those securities higher or lower than another fund would have priced the security. Also, the use of fair valuation may cause the Fund's performance to diverge to a greater degree from the performance of various benchmarks used to compare the Fund's performance because benchmarks generally do not use fair valuation techniques. Because of the judgment involved in fair valuation decisions, there can be no assurance that the value ascribed to a particular security is accurate. The Fund has retained one or more independent fair valuation pricing services to assist in the fair valuation process for foreign securities.

Transaction Rules and Policies

The Fund, the Distributor or the Transfer Agent may refuse any order to buy or exchange shares. If this happens, the Fund will return any money it received, but no interest will be paid on that money.

Order Processing

Orders to buy, sell or exchange Fund shares are processed on business days. Depending upon the class of shares, orders can be made by mail, by telephone or online. Orders received in “good form” by the Transfer Agent or your selling agent before the end of a business day are priced at the NAV per share of the Fund's applicable share class on that day. Orders received after the end of a business day will receive the next business day's NAV per share. When a written order to buy, sell or exchange shares is sent to the Transfer Agent, the share price used to fill the order is the next price calculated by the Fund after the Transfer Agent receives the order at its transaction processing center in Canton, Massachusetts, not the P.O. Box provided for regular mail delivery. The market value of the Fund's investments may change between the time you submit your order and the time the Fund next calculates its NAV per share. The business day that applies to your order is also called the trade date.

“Good Form”

An order is in “good form” if the Transfer Agent or your selling agent has all of the information and documentation it deems necessary to effect your order. For example, when you sell shares by letter of instruction, “good form” means that your letter has (i) complete instructions and the signatures of all account owners, (ii) a Medallion Signature Guarantee for amounts greater than $100,000 and other transactions, as described below, and (iii) any other required documents completed and attached. For the documents required for sales by corporations, agents, fiduciaries, surviving joint owners and other legal entities, call 800.345.6611.

Medallion Signature Guarantees

The Transfer Agent may require a Medallion Signature Guarantee for your signature in order to process certain transactions. A Medallion Signature Guarantee helps assure that a signature is genuine and not a forgery. A Medallion Signature Guarantee must be provided by an eligible guarantor institution including, but not limited to, the following: a bank, credit union, savings association, broker or dealer that participates in the Securities Transfer Association Medallion Program (STAMP), the Stock Exchange Medallion Program (SEMP) or the New York Stock Exchange Medallion Signature Program (MSP). Notarization by a notary public is not an acceptable signature guarantee. The Transfer Agent reserves the right to reject a signature guarantee and to request additional documentation for any transaction.

A Medallion Signature Guarantee is required if: (i) the transaction amount is over $100,000; (ii) you want your check made payable to someone other than the registered account owner(s); (iii) the address of record has changed within the last 30 days; (iv) you want the check mailed to an address other than the address of record; (v) you want proceeds to be sent according to existing bank account instructions not coded for outgoing Automated Clearing House (ACH) or wire, or to a bank account not on file; (vi) you are the beneficiary of the account and the account owner is deceased (other documentation may be required); or (vii) you are changing legal ownership of your account.

44	Prospectus 2016

Columbia Convertible Securities Fund

Buying, Selling and Exchanging Shares (continued)

Customer Identification Program

Federal law requires the Fund to obtain and record specific personal information to verify your identity when you open an account. This information may include your name, address, date of birth (for individuals) and taxpayer or other government issued identification (e.g., social security number (SSN) or other taxpayer identification number (TIN)). If you fail to provide the requested information, the Fund may need to delay the date of your purchase or may be unable to open your account, which may result in a return of your investment monies. In addition, if the Fund is unable to verify your identity after your account is open, the Fund reserves the right to close your account or take other steps as deemed reasonable. The Fund will not be liable for any loss resulting from any purchase delay, application rejection or account closure due to a failure to provide proper identifying information.

Small Account Policy — Class A, Class B, Class C, Class T and Class Z Share Accounts Below the Minimum Account Balance

The Funds generally will automatically sell your shares if the value of your Fund account (treating each account of the Fund you own separately from any other account of the Fund you may own) falls below the applicable Minimum Account Balance. The Minimum Account Balance varies among Funds, share classes and types of accounts, as follows:

    

If your shares are sold, the Transfer Agent will remit the sale proceeds to you. Any otherwise applicable CDSC will not be imposed on such an automatic sale of your shares. The Transfer Agent will send you written notification in advance of any automatic sale, which will provide details on how you may avoid such an automatic sale. Generally, you may avoid such an automatic sale by raising your account balance, consolidating your accounts through an exchange of shares of another Fund in which you hold shares, or setting up a Systematic Investment Plan. For more information, contact the Transfer Agent or your selling agent. The Transfer Agent's contact information (toll-free number and mailing addresses) as well as the Funds' website address can be found at the beginning of the section Choosing a Share Class .

The Fund also may sell your Fund shares if your selling agent tells us to sell your shares pursuant to arrangements made with you, and under certain other circumstances allowed under the 1940 Act.

Small Account Policy — Class A, Class B, Class C, Class T and Class Z Share Accounts Minimum Balance Fee

If the value of your Fund account (treating each account of the Fund you own separately from any other account of the Fund you may own) falls below the minimum initial investment requirement applicable to you for any reason, including as a result of market decline, your account generally will be subject to a $20 annual fee. This fee will be assessed through the automatic sale of Fund shares in your account. Any otherwise applicable CDSC will not be imposed on such an automatic sale of your shares. The Transfer Agent will reduce the expenses paid by the Fund by any amounts it collects from the assessment of this fee. For Funds that do not have transfer agency expenses against which to offset the amount collected through assessment of this fee, the fee will be paid directly to the Fund. The Transfer Agent will send you written notification in advance of assessing any fee, which will provide details on how you can avoid the imposition of such fee. Generally, you may avoid the imposition of such fee by raising your Fund account balance, consolidating your Fund accounts through an exchange of shares of another Fund in which you hold shares,

Prospectus 2016

45

Columbia Convertible Securities Fund

Buying, Selling and Exchanging Shares (continued)

or setting up a Systematic Investment Plan that invests at least monthly. For more information, contact the Transfer Agent or your selling agent. The Transfer Agent's contact information (toll-free number and mailing addresses) as well as the Funds' website address can be found at the beginning of the section Choosing a Share Class .

The Funds reserve the right to lower the account size trigger point for the minimum balance fee in any year or for any class of shares when we believe it is appropriate to do so in light of declines in the market value of Fund shares, sales loads applicable to a particular class of shares, or for other reasons.

Exceptions to the Small Account Policy (Accounts Below Minimum Account Balance and Minimum Balance Fee)

The automatic sale of Fund shares of accounts under $250 and the annual minimum balance fee described above do not apply to shareholders of Class I, Class K, Class R, Class R4, Class R5, Class W and Class Y shares; shareholders holding their shares through broker-dealer networked accounts; wrap fee and omnibus accounts; accounts with active Systematic Investment Plans; certain qualified retirement plans; and health savings accounts. The automatic sale of Fund shares of accounts under the applicable Minimum Account Balance does not apply to individual retirement plans.

Small Account Policy — Broker-Dealer and Wrap Fee Accounts

The Funds may automatically redeem, at any time, broker-dealer networked accounts and wrap fee accounts that have account balances of $20 or less or have less than one share.

Information Sharing Agreements

As required by Rule 22c-2 under the 1940 Act, the Funds or certain of their service providers will enter into information sharing agreements with selling agents, including participating life insurance companies and selling agents that sponsor or offer retirement plans through which shares of the Funds are made available for purchase. Pursuant to Rule 22c-2, selling agents are required, upon request, to: (i) provide shareholder account and transaction information; and (ii) execute instructions from the Fund to restrict or prohibit further purchases of Fund shares by shareholders who have been identified by the Fund as having engaged in transactions that violate the Fund's excessive trading policies and procedures.

Excessive Trading Practices Policy of Non-Money Market Funds

Right to Reject or Restrict Share Transaction Orders — The Fund is intended for investors with long-term investment purposes and is not intended as a vehicle for frequent trading activity (market timing) that is excessive. Investors should transact in Fund shares primarily for investment purposes. The Board has adopted excessive trading policies and procedures that are designed to deter excessive trading by investors (the Excessive Trading Policies and Procedures). The Fund discourages and does not accommodate excessive trading.

The Fund reserves the right to reject, without any prior notice, any purchase or exchange order for any reason, and will not be liable for any loss resulting from rejected orders. For example, the Fund may in its sole discretion restrict or reject a purchase or exchange order even if the transaction is not subject to the specific limitation described below if the Fund or its agents determine that accepting the order could interfere with efficient management of the Fund's portfolio or is otherwise contrary to the Fund's best interests. The Excessive Trading Policies and Procedures apply equally to purchase or exchange transactions communicated directly to the Transfer Agent and to those received by selling agents.

Specific Buying and Exchanging Limitations — If a Fund detects that an investor has made two “material round trips” in any 28-day period, it will generally reject the investor's future purchase orders, including exchange purchase orders, involving any Fund.

For these purposes, a “round trip” is a purchase or exchange into the Fund followed by a sale or exchange out of the Fund, or a sale or exchange out of the Fund followed by a purchase or exchange into the Fund. A “material” round trip is one that is deemed by the Fund to be material in terms of its amount or its potential detrimental impact on the Fund. Independent of this limit, the Fund may, in its sole discretion, reject future buy orders by any person, group or account that appears to have engaged in any type of excessive trading activity.

46	Prospectus 2016

Columbia Convertible Securities Fund

Buying, Selling and Exchanging Shares (continued)

These limits generally do not apply to automated transactions or transactions by registered investment companies in a “fund-of-funds” structure. These limits do not apply to payroll deduction contributions by retirement plan participants, transactions initiated by a retirement plan sponsor or certain other retirement plan transactions consisting of rollover transactions, loan repayments and disbursements, and required minimum distribution redemptions. They may be modified or rescinded for accounts held by certain retirement plans to conform to plan limits, for considerations relating to the Employee Retirement Income Security Act of 1974 or regulations of the Department of Labor, and for certain asset allocation or wrap programs. Accounts known to be under common ownership or control generally will be counted together, but accounts maintained or managed by a common intermediary generally will not be considered to be under common ownership or control. The Fund retains the right to modify these restrictions at any time without prior notice to shareholders. In addition, the Fund may, in its sole discretion, reinstate trading privileges that have been revoked under the Fund's Excessive Trading Policies and Procedures.

Limitations on the Ability to Detect and Prevent Excessive Trading Practices — The Fund takes various steps designed to detect and prevent excessive trading, including daily review of available shareholder transaction information. However, the Fund receives buy, sell or exchange orders through selling agents, and cannot always know of or reasonably detect excessive trading that may be facilitated by selling agents or by the use of the omnibus account arrangements they offer. Omnibus account arrangements are common forms of holding shares of mutual funds, particularly among certain selling agents such as broker-dealers, retirement plans and variable insurance products. These arrangements often permit selling agents to aggregate their clients' transactions and accounts, and in these circumstances, the identity of the shareholders is often not known to the Fund.

Some selling agents apply their own restrictions or policies to underlying investor accounts, which may be more or less restrictive than those described here. This may impact the Fund's ability to curtail excessive trading, even where it is identified. For these and other reasons, it is possible that excessive trading may occur despite the Fund's efforts to detect and prevent it.

Although these restrictions and policies involve judgments that are inherently subjective and may involve some selectivity in their application, the Fund seeks to act in a manner that it believes is consistent with the best interests of shareholders in making any such judgments.

Risks of Excessive Trading — Excessive trading creates certain risks to the Fund's long-term shareholders and may create the following adverse effects:

■	negative impact on the Fund's performance;

■	potential dilution of the value of the Fund's shares;

■	interference with the efficient management of the Fund's portfolio, such as the need to maintain undesirably large cash positions, the need to use its line of credit or the need to buy or sell securities it otherwise would not have bought or sold;

■	losses on the sale of investments resulting from the need to sell securities at less favorable prices;

■	increased taxable gains to the Fund's remaining shareholders resulting from the need to sell securities to meet sell orders; and

■	increased brokerage and administrative costs.

To the extent that the Fund invests significantly in foreign securities traded on markets that close before the Fund's valuation time, it may be particularly susceptible to dilution as a result of excessive trading. Because events may occur after the close of foreign markets and before the Fund's valuation time that influence the value of foreign securities, investors may seek to trade Fund shares in an effort to benefit from their understanding of the value of foreign securities as of the Fund's valuation time. This is often referred to as price arbitrage. The Fund has adopted procedures designed to adjust closing market prices of foreign securities under certain circumstances to reflect what the Fund believes to be the fair value of those securities as of its valuation time. To the extent the adjustments do not work fully, investors engaging in price arbitrage may cause dilution in the value of the Fund's shares held by other shareholders.

Prospectus 2016

47

Columbia Convertible Securities Fund

Buying, Selling and Exchanging Shares (continued)

Similarly, to the extent that the Fund invests significantly in thinly traded high-yield bonds (junk bonds) or equity securities of small-capitalization companies, because these securities are often traded infrequently, investors may seek to trade Fund shares in an effort to benefit from their understanding of the value of these securities. This is also a type of price arbitrage. Any such frequent trading strategies may interfere with efficient management of the Fund's portfolio to a greater degree than would be the case for mutual funds that invest in highly liquid securities, in part because the Fund may have difficulty selling those portfolio securities at advantageous times or prices to satisfy large and/or frequent sell orders. Any successful price arbitrage may also cause dilution in the value of Fund shares held by other shareholders.

Excessive Trading Practices Policy of Columbia Money Market Fund

A money market fund is designed to offer investors a liquid cash option that they may buy and sell as often as they wish. Accordingly, the Board has not adopted policies and procedures designed to discourage excessive or short-term trading of Columbia Money Market Fund shares. However, since frequent purchases and sales of Columbia Money Market Fund shares could in certain instances harm shareholders in various ways, including reducing the returns to long-term shareholders by increasing costs (such as spreads paid to dealers who trade money market instruments with Columbia Money Market Fund) and disrupting portfolio management strategies, Columbia Money Market Fund reserves the right, but has no obligation, to reject any purchase or exchange transaction at any time. Except as expressly described in this prospectus (such as minimum purchase amounts), Columbia Money Market Fund has no limits on purchase or exchange transactions. In addition, Columbia Money Market Fund reserves the right to impose or modify restrictions on purchases, exchanges or trading of Fund shares at any time.

48	Prospectus 2016

Columbia Convertible Securities Fund

Buying, Selling and Exchanging Shares (continued)

Opening an Account and Placing Orders

We encourage you to consult with a financial advisor who can help you with your investment decisions and who can help you open an account. Once you have an account, you can buy, sell or exchange shares by contacting your financial advisor who will send your order to the Transfer Agent or your selling agent. As described below, once you have an account you can also communicate your orders directly to the Transfer Agent by mail, by telephone or online.

The Funds are generally available directly and through broker-dealers, banks and other selling agents or institutions, and through certain qualified and non-qualified plans, wrap fee products or other investment products sponsored by selling agents. You may exchange or sell shares through your selling agent. If you maintain your account directly with your selling agent, you must contact that agent to process your transaction.

Not all selling agents offer the Funds and certain selling agents that offer the Funds may not offer all Funds on all investment platforms or programs. Please consult with your financial advisor to determine the availability of the Funds. If you set up an account at a selling agent that does not have, and is unable to obtain, a selling agreement with the Distributor, you will not be able to transfer Fund holdings to that account. In that event, you must either maintain your Fund holdings with your current selling agent, find another selling agent with a selling agreement, or sell your Fund shares, paying any applicable CDSC. Please be aware that transactions in taxable accounts are taxable events and may result in income tax liability.

Selling agents that offer the Funds may charge you additional fees for the services they provide and they may have different policies that are not described in this prospectus. Some policy differences may include different minimum investment amounts, exchange privileges, Fund choices and cutoff times for investments. Additionally, recordkeeping, transaction processing and payments of distributions relating to your account may be performed by the selling agents through which your shares of the Fund are held. Since the Fund (and its service providers) may not have a record of your account transactions, you should always contact the financial advisor employed by the selling agent through which you purchased or at which you maintain your shares of the Fund to make changes to your account or to give instructions concerning your account, or to obtain information about your account. The Fund and its service providers, including the Distributor and the Transfer Agent, are not responsible for the failure of these selling agents to carry out their obligations to its customers.

The Fund may engage selling agents to receive purchase, exchange and sell orders on its behalf. Accounts established directly with the Fund will be serviced by the Transfer Agent. The Funds, the Transfer Agent and the Distributor do not provide investment advice.

Fund Closing

With limited exceptions, the Fund will no longer accept new investors at the time that the Fund's total assets under management reach $2 billion. Following the closing date, any investors that maintain an investment in the Fund will continue to be able to purchase additional shares of the Fund; however, in the event that an order to purchase shares is received after the closing date from a potential investor that does not already hold shares of the Fund, the order will be refused and any money that the Fund has received will be returned to the investor or their selling agent, as appropriate. Retirement plans and certain investment funds managed by the Investment Manager that currently offer or employ the Fund as an investment option will continue to be able to purchase or offer shares of the Fund after the closing date.

Accounts Established Directly with the Fund

You or the financial advisor through which you buy shares may establish an account with the Fund. To do so, complete a Fund account application with your financial advisor or investment professional, and mail the account application to the Transfer Agent. Account applications may be obtained at columbiathreadneedle.com/us or may be requested by calling 800.345.6611. Make your check payable to the Fund. You will be assessed a $15 fee for any checks rejected by your financial institution due to insufficient funds or other reasons. The Funds do not accept cash, credit card convenience checks, money orders, traveler's checks, starter checks, third or fourth party checks, or other cash equivalents.

Prospectus 2016

49

Columbia Convertible Securities Fund

Buying, Selling and Exchanging Shares (continued)

Mail your check and completed application to the Transfer Agent at its regular or express mail address that can be found at the beginning of the section Choosing a Share Class. You may also use these addresses to request an exchange or redemption of Fund shares. When a written order to buy, sell or exchange shares is sent to the Transfer Agent, the share price used to fill the order is the next price calculated by the Fund after the Transfer Agent receives the order at its transaction processing center in Canton, Massachusetts, not the P.O. Box provided for regular mail delivery.

You will be sent a statement confirming your purchase and any subsequent transactions in your account. You will also be sent quarterly and annual statements detailing your transactions in the Fund and the other Funds you own under the same account number. Duplicate quarterly account statements for the current year and duplicate annual statements for the most recent prior calendar year will be sent to you free of charge. Copies of year-end statements for prior years are available for a fee. Please contact the Transfer Agent for more information.

Written Transactions

Once you have an account, you can communicate written buy, sell or exchange orders to the Transfer Agent at its address that can be found at the beginning of the section Choosing a Share Class . When a written order to buy, sell or exchange shares is sent to the Transfer Agent, the share price used to fill the order is the next price calculated by the Fund after the Transfer Agent receives the order at its transaction processing center in Canton, Massachusetts, not the P.O. Box provided for regular mail delivery.

Include in your letter: your name; the name of the Fund(s); your account number; the class of shares to be exchanged or sold; your SSN or other TIN; the dollar amount or number of shares you want to exchange or sell; specific instructions regarding delivery of redemption proceeds or exchange destination; signature(s) of registered account owner(s); and any special documents the Transfer Agent may require in order to process your order.

Corporate, trust or partnership accounts may need to send additional documents. Payment will be mailed to the address of record and made payable to the names listed on the account, unless your request specifies differently and is signed by all owners.

Telephone Transactions

For Class A, Class B, Class C, Class R, Class T, Class Y and Class Z shares, once you have an account, you may place orders to buy, sell or exchange shares by telephone. To place orders by telephone, call 800.422.3737. Have your account number and SSN or TIN available when calling.

You can sell Fund shares via the telephone, by electronic funds transfer or by check to the address of record, up to and including an aggregate of $100,000 of shares per day, per Fund account, if you qualify for telephone orders. Wire redemptions requested via the telephone are subject to a maximum of $3 million of shares per day, per Fund. You can buy up to and including $100,000 of shares per day, per Fund account through your bank account as an Automated Clearing House (ACH) transaction via the telephone if you qualify for telephone orders.

Telephone orders may not be as secure as written orders. The Fund will take reasonable steps to confirm that telephone instructions are genuine. For example, we require proof of your identification before we will act on instructions received by telephone and may record telephone conversations. However, the Fund and its agents will not be responsible for any losses, costs or expenses resulting from an unauthorized telephone instruction when reasonable steps have been taken to confirm that telephone instructions are genuine. Telephone orders may be difficult to complete during periods of significant economic or market change or business interruption.

Online Transactions

For Class A, Class B, Class C, Class R, Class T, Class Y and Class Z shares, once you have an account, you may contact the Transfer Agent at 800.345.6611 for more information on account trading restrictions and the special sign-up procedures required for online transactions. The Transfer Agent has procedures in place to authenticate electronic orders you deliver through the internet. You will be required to accept the terms of an online agreement and to establish and utilize a password in order to access online account services. You can sell up to and including an aggregate of $100,000 of shares per day, per Fund account through the internet if you qualify for internet orders.

50	Prospectus 2016

Columbia Convertible Securities Fund

Buying, Selling and Exchanging Shares (continued)

Wire Transactions

You may buy (or redeem) Class A, Class B (redemptions only), Class C, Class T, Class W (redemptions only), Class Y and Class Z shares of a Fund by wiring money from (or to) your bank account to (or from) your Fund account by calling the Transfer Agent at 800.422.3737. You must set up this feature prior to your request unless you are submitting your request in writing with a Medallion Signature Guarantee. The Transfer Agent charges a fee for shares sold by Fedwire. The Transfer Agent may waive the fee for certain accounts. In the case of a redemption, the receiving bank may charge an additional fee. The minimum amount that can be redeemed by wire is $500. The maximum amount that can be redeemed over the telephone is $3 million per day, per Fund account.

Electronic Funds Transfer

You may buy (or redeem) Class A, Class B (redemptions only), Class C, Class T, Class Y and Class Z shares of a Fund by electronically transferring money from (or to) your bank account to (or from) your Fund account up to and including an aggregate of $100,000 of shares per day, per Fund account by calling the Transfer Agent at 800.422.3737. An electronic funds transfer may take up to three business days to settle and be considered in “good form.” You must set up this feature by contacting the Transfer Agent prior to your request to obtain any necessary forms.

Important: Payments sent by an electronic fund transfer, a bank authorization, or check that are not guaranteed may take up to 10 or more calendar days to clear. If you request a redemption before the purchase funds clear, this may cause your redemption request to fail to process if the requested amount includes unguaranteed funds. If you purchased your shares by check or from your bank account as an ACH transaction, the Fund may hold the redemption proceeds when you sell those shares for a period of time after the trade date of the purchase.

Buying Shares

Eligible Investors

Class A and Class C Shares

Class A and Class C shares are available to the general public for investment. Once you have opened an account, you can buy Class A and Class C shares in a lump sum, through our Systematic Investment Plan, by dividend diversification, by wire or by electronic funds transfer. As described in this prospectus, Class A shares but not Class C shares are generally subject to a front-end sales charge, which reduces the dollar amount invested in a Fund. However, Class C shares are generally subject to higher fees than Class A shares, which will reduce any returns on Class C shares relative to Class A shares. You may be eligible to purchase Class A shares without a front-end sales charge if the value of your Columbia Fund shares held in eligible accounts reaches $1,000,000 (in the case of a purchase of Class A shares of a Taxable Fund) or $500,000 (in the case of a purchase of Class A shares of a Tax-Exempt Fund). If you are eligible to invest in Class A shares without a front-end sales charge, you should discuss your options with your selling agent. For more information, see Choosing a Share Class – Reductions/Waivers of Sales Charges . A purchase order for Class C shares of a Taxable or Tax-Exempt Fund is limited to $999,999 and $499,999, respectively. Your selling agent may impose additional limits on investments in Class C shares.

For Columbia Money Market Fund, new investments must be made in Class A, Class I, Class W or Class Z shares, subject to eligibility. Class C and Class R shares of Columbia Money Market Fund are available as a new investment only to investors in the Distributor's proprietary 401(k) products, provided that such investor is eligible to invest in the class and transacts directly with the Fund or the Transfer Agent through a third party administrator or third party recordkeeper. Columbia Money Market Fund offers other classes of shares only to facilitate exchanges with other Funds offering these classes of shares.

Class B Shares (Closed)

The Funds no longer accept investments from new or existing investors in Class B shares, except for certain limited transactions involving existing investors in Class B shares as described in more detail below.

Additional Class B shares will be issued only to existing investors in Class B shares and only through the following two types of transactions (Qualifying Transactions):

■	Dividend and/or capital gain distributions may continue to be reinvested in Class B shares of a Fund.

Prospectus 2016

51

Columbia Convertible Securities Fund

Buying, Selling and Exchanging Shares (continued)

■	Shareholders invested in Class B shares of a Fund may exchange those shares for Class B shares of other Funds offering such shares. Certain exceptions apply, including that not all Funds may permit exchanges.

Any initial purchase orders for the Fund's Class B shares will be rejected (other than through a Qualifying Transaction that is an exchange transaction).

Unless contrary instructions are received in advance by the Fund, any purchase orders (except those submitted by a selling agent through the National Securities Clearing Corporation (NSCC) as described in more detail below) that are orders for additional Class B shares of the Fund received from existing investors in Class B shares, including orders made through an active systematic investment plan, will automatically be invested in Class A shares of the Fund, without regard to the normal minimum initial investment requirement for Class A shares, but subject to the front-end sales charge that generally applies to Class A shares. See Choosing a Share Class — Sales Charges and Commissions — Class A Shares — Front-End Sales Charge for additional information. Your selling agent may have different policies not described here, including a policy to reject purchase orders for a Fund's Class B shares or to automatically invest the purchase amount in Columbia Money Market Fund. Please consult your selling agent to understand its policy.

Additional purchase orders for a Fund's Class B shares by an existing Class B shareholder, submitted by such shareholder's selling agent through the NSCC, will be rejected due to operational limitations of the NSCC. Investors should consult their selling agent if they wish to invest in the Fund by purchasing a share class of the Fund other than Class B shares.

Dividend and/or capital gain distributions from Class B shares of a Fund will not be automatically invested in Class B shares of another Fund. Unless contrary instructions are received in advance of the date of declaration, such dividend and/or capital gain distributions from Class B shares of a Fund will be reinvested in Class B shares of the same Fund that is making the distribution.

Class I Shares

Class I shares are available only to the Funds (i.e., fund-of-funds investments).

Class K Shares (Closed)

Class K shares are closed to new investors and new accounts, subject to certain limited exceptions described below.

Shareholders who opened and funded a Class K account with the Fund as of the close of business on December 31, 2010 (including accounts once funded that subsequently reached a zero balance) may continue to make additional purchases of Class K shares. Plans may continue to make additional purchases of Fund shares and add new participants, and new plans sponsored by the same or an affiliated sponsor may invest in the Fund (and add new participants) if an initial plan so sponsored invested in the Fund as of December 31, 2010 (or had approved the Fund as an investment option as of December 31, 2010 and funded its initial account with the Fund prior to March 31, 2011) and holds Fund shares at the plan level.

An order to purchase Class K shares received by the Fund or the Transfer Agent after the close of business on December 31, 2010 (other than as described above) from a new investor or a new account that is not eligible to purchase shares will be refused by the Fund and the Transfer Agent and any money that the Fund or the Transfer Agent received with the order will be returned to the investor or the selling agent, as appropriate, without interest.

Class K shares are designed for qualified employee benefit plans, trust companies or similar institutions, charitable organizations that meet the definition in Section 501(c)(3) of the Code, non-qualified deferred compensation plans whose participants are included in a qualified employee benefit plan described above, state sponsored college savings plans established under Section 529 of the Code, and health savings accounts created pursuant to public law 108-173. Class K shares may be purchased, sold or exchanged only through the Distributor or an authorized selling agent.

52	Prospectus 2016

Columbia Convertible Securities Fund

Buying, Selling and Exchanging Shares (continued)

Class R Shares

Class R shares are available only to eligible health savings accounts sponsored by third party platforms, including those sponsored by Ameriprise Financial affiliates, eligible retirement plans and, in the sole discretion of the Distributor, other types of retirement accounts held through platforms maintained by selling agents approved by the Distributor. Eligible retirement plans include any retirement plan other than individual 403(b) plans. Class R shares are generally not available for investment through retail nonretirement accounts, traditional and Roth IRAs, Coverdell Education Savings Accounts, SEPs, SAR-SEPs, Simple IRAs or 529 tuition programs. Contact the Transfer Agent or your retirement plan or health savings account administrator for more information about investing in Class R shares.

Class R4 Shares

Class R4 shares are available only to (i) omnibus retirement plans, (ii) trust companies or similar institutions, (iii) broker-dealers, banks, trust companies and similar institutions that clear Fund share transactions for their client or customer investment advisory or similar accounts through designated selling agents and their mutual fund trading platforms that have been granted specific written authorization from the Transfer Agent with respect to Class R4 eligibility apart from selling, servicing or similar agreements, (iv) 501(c)(3) charitable organizations, (v) 529 plans and (vi) health savings accounts.

Class R5 Shares

Class R5 shares are available only to (i) certain registered investment advisers that clear Fund share transactions for their client or customer accounts through designated selling agents and their mutual fund trading platforms that have been granted specific written authorization from the Transfer Agent with respect to Class R5 eligibility apart from selling, servicing or similar agreements and (ii) omnibus retirement plans. Prior to November 8, 2012, Class R5 shares were closed to new investors and new accounts, subject to certain exceptions. Existing shareholders who do not satisfy the new eligibility requirements for investment in Class R5 may not establish new Class R5 accounts but may continue to make additional purchases of Class R5 shares in accounts opened and funded prior to November 8, 2012; provided, however, that investment advisory programs and similar programs that opened a Class R5 account as of May 1, 2010, and continuously hold Class R5 shares in such account after such date, may generally not only continue to make additional purchases of Class R5 shares but also open new Class R5 accounts for such pre-existing programs and add new shareholders in the program.

Class T Shares

Class T shares are available only to investors who received (and who have continuously held) Class T shares in connection with the merger of certain Galaxy funds into certain Funds that were then named Liberty funds.

Class W Shares

Class W shares are available only to investors purchasing through authorized investment programs managed by investment professionals, including discretionary managed account programs. Class W shares may be purchased, sold or exchanged only through the Distributor or an authorized selling agent. Shares originally purchased in a discretionary managed account may continue to be held in Class W outside of a discretionary managed account, but no additional Class W purchases may be made and no exchanges to Class W shares of another Fund may be made outside of a discretionary managed account.

Class Y Shares

Class Y shares, except as noted in Appendix S to the SAI, are available only to retirement plans that maintain plan-level or omnibus accounts with the Fund (through the Transfer Agent).

Prospectus 2016

53

Columbia Convertible Securities Fund

Buying, Selling and Exchanging Shares (continued)

Class Z Shares

Class Z shares are available only to the categories of eligible investors described below under Class Z Shares Minimum Initial Investments . Selling agents that clear Fund share transactions through designated selling agents and their mutual fund trading platforms that were given specific written notice from the Transfer Agent of the termination, effective March 29, 2013, of their eligibility for new purchases of Class Z shares and omnibus retirement plans are not permitted to establish new Class Z accounts, subject to certain exceptions described below.

Omnibus retirement plans that opened and, subject to certain exceptions, funded a Class Z account with the Fund as of the close of business on March 28, 2013, and have continuously held Class Z shares in such account after such date, may generally continue to make additional purchases of Class Z shares, open new Class Z accounts and add new participants. In addition, an omnibus retirement plan affiliated with a grandfathered plan may, in the sole discretion of the Distributor, open new Class Z accounts in a Fund if the affiliated plan opened a Class Z account on or before March 28, 2013. If an omnibus retirement plan invested in Class Z shares changes recordkeepers after March 28, 2013, any new accounts established for that plan may not be established in Class Z shares, but such a plan may establish new accounts in a different share class for which the plan is eligible. The Distributor may, in its sole discretion, delay the funding requirement described above for omnibus retirement plans to allow an omnibus retirement plan that opened a Class Z account (the initial Class Z account) with the Fund as of the close of business on March 28, 2013 to make additional purchases of Class Z shares, open new Class Z accounts and add new participants so long as the initial Class Z account was funded by July 2, 2013.

Accounts of selling agents (other than omnibus retirement plans, which are discussed above) that clear Fund share transactions for their client or customer accounts through designated selling agents and their mutual fund trading platforms that received specific written notice from the Transfer Agent of the termination, effective March 29, 2013, of their eligibility for new purchases of Class Z shares will not be permitted to establish new Class Z accounts or make additional purchases of Class Z shares (other than through reinvestment of distributions). Such accounts may, at their holder’s option, exchange Class Z shares of a Fund, without the payment of a sales charge, for Class A shares of the same Fund.

Additional Eligible Investors

In addition, the Distributor, in its sole discretion, may accept investments in any share class from investors other than those listed in this prospectus.

Minimum Initial Investments

The table below shows the Fund's minimum initial investment requirements, which may vary by Fund, class and type of account.

    

54	Prospectus 2016

Columbia Convertible Securities Fund

Buying, Selling and Exchanging Shares (continued)

(a)

If your Class A, Class B, Class C, Class T or Class Z shares account balance falls below the minimum initial investment amount for any reason, including a market decline, you may be asked to increase it to the minimum initial investment amount or establish a monthly Systematic Investment Plan. If you do not do so, your account will be subject to a $20 annual low balance fee and/or shares may be automatically redeemed and the proceeds mailed to you if the account falls below the minimum account balance. See Buying, Selling and Exchanging Shares — Transaction Rules and Policies above.

(b)	Columbia Money Market Fund — $2,000

(c)	Columbia Money Market Fund — $1,000

(d)

There is no minimum initial investment in Class R5 shares for omnibus retirement plans. A minimum initial investment of $100,000 applies to aggregate purchases of Class R5 shares of a Fund for combined underlying accounts of any registered investment adviser that clears Fund share transactions for their client or customer accounts through designated selling agents and their mutual fund trading platforms that have been granted specific written authorization from the Transfer Agent with respect to Class R5 eligibility apart from selling, servicing or similar agreements.

(e)

The minimum initial investment amount for Class Z shares is $0, $1,000 or $2,000 depending upon the category of eligible investor. See — Class Z Shares Minimum Initial Investments below. The minimum initial investment amount for systematic investment plan accounts is the same as the amount set forth in the first two rows of the table, as applicable.

The minimum initial investment requirements may be waived for accounts that are managed by an investment professional, for accounts held in approved discretionary or non-discretionary wrap programs, or for accounts that are a part of an employer-sponsored retirement plan. The Distributor, in its sole discretion, may also waive minimum initial investment requirements for other account types.

Minimum investment and related requirements may be modified at any time, with or without prior notice. If your account is closed and then re-opened with a systematic investment plan, your account must meet the then-current applicable minimum initial investment.

Class Z Shares Minimum Initial Investments

There is no minimum initial investment in Class Z shares for the following categories of eligible investors:

■

Any person investing all or part of the proceeds of a distribution, rollover or transfer of assets into a Columbia Management Individual Retirement Account, from any deferred compensation plan which was a shareholder of any of the Funds of Columbia Acorn Trust on September 29, 2000, in which the investor was a participant and through which the investor invested in one or more of the Funds of Columbia Acorn Trust immediately prior to the distribution, transfer or rollover.

■	Any health savings account sponsored by a third party platform.

■

Any investor participating in a wrap program sponsored by a selling agent or other entity that is paid an asset-based fee by the investor and that is not compensated by the Fund for those services, other than payments for shareholder servicing or sub-accounting performed in place of the Transfer Agent.

The minimum initial investment in Class Z shares for the following categories of eligible investors is $1,000:

■	Any individual retirement plan for which a selling agent or other entity provides services and is not compensated by the Fund for those services, other than in the form of payments for shareholder servicing or sub-accounting performed in place of the Transfer Agent.

■

Any employee of Columbia Management Investment Advisers, LLC, the Distributor or the Transfer Agent and immediate family members of any of the foregoing who share the same address and any persons employed as of April 30, 2010 by Columbia Management Advisors, LLC, Columbia Management Distributors, Inc., or Columbia Management Services, Inc., the adviser, distributor and transfer agent of series of CFST and CFST I prior to May 1, 2010 (the Previous Service Providers) and immediate family members of any of the foregoing who share the same address are eligible to make new and subsequent purchases in Class Z shares through an individual retirement account. If you maintain your account with a selling agent, you must contact that selling agent each time you seek to purchase shares to notify them that you qualify for Class Z shares.

The minimum initial investment in Class Z shares for the following categories of eligible investors is $2,000:

■

Any shareholder (as well as any family member of a shareholder or person listed on an account registration for any account of the shareholder) of another fund distributed by the Distributor (i) who holds Class Z shares; (ii) who held Primary A shares prior to the share class redesignation of Primary A shares as Class Z shares that occurred on

Prospectus 2016

55

Columbia Convertible Securities Fund

Buying, Selling and Exchanging Shares (continued)

August 22, 2005; (iii) who holds Class A shares that were obtained by an exchange of Class Z shares; or (iv) who bought shares of certain mutual funds that were not subject to sales charges and that merged with a series of CFST or CFST I distributed by the Distributor.

■

Any investor participating in an account offered by a selling agent or other entity that provides services to such an account, is paid an asset-based fee by the investor and is not compensated by the Fund for those services, other than payments for shareholder servicing or sub-accounting performed in place of the Transfer Agent (each investor buying shares through a financial intermediary must independently satisfy the minimum investment requirement noted above).

■	Any institutional investor who is a corporation, partnership, trust, foundation, endowment, institution, government entity, or similar organization, which meets the respective qualifications for an accredited investor, as defined under the Securities Act of 1933.

■	Certain financial institutions and intermediaries, such as insurance companies, trust companies, banks, endowments, investment companies or foundations, buying shares for their own account, including Ameriprise Financial and its affiliates and/or subsidiaries.

■

Any employee of Columbia Management Investment Advisers, LLC, the Distributor or the Transfer Agent and immediate family members of any of the foregoing who share the same address and any persons employed as of April 30, 2010 by the Previous Service Providers and any of their immediate family members who share the same address are eligible to make new and subsequent purchases in Class Z shares through a non-retirement account. If you maintain your account with a selling agent, you must contact that selling agent each time you seek to purchase shares to notify them that you qualify for Class Z shares.

■	Certain other investors as set forth in more detail in the SAI.

Systematic Investment Plan

The Systematic Investment Plan allows you to schedule regular purchases via automatic transfers from your bank account to the Fund on a monthly, quarterly or semiannual basis. Contact the Transfer Agent or your selling agent to set up the plan. Systematic Investment Plans may not be available for all share classes.

Dividend Diversification

Generally, you may automatically invest distributions made by another Fund into the same class of shares (and in some cases certain other classes of shares) of a Fund at no additional sales charge. A sales charge may apply when you invest distributions made with respect to shares that were not subject to a sales charge at the time of your initial purchase. Call the Transfer Agent at 800.345.6611 for details. The ability to invest distributions from one Fund to another Fund may not be available to accounts held at all selling agents.

Other Purchase Rules You Should Know

■	Once the Transfer Agent or your selling agent receives your buy order in “good form,” your purchase will be made at the next calculated public offering price per share, which is the net asset value per share plus any sales charge that applies.

■	You generally buy Class A and Class T shares at the public offering price per share because purchases of these share classes are generally subject to a front-end sales charge.

■	You buy Class B, Class C, Class I, Class K, Class R, Class R4, Class R5, Class W, Class Y and Class Z shares at net asset value per share because no front-end sales charge applies to purchases of these share classes.

■	The Distributor and the Transfer Agent reserve the right to cancel your order if the Fund does not receive payment within three business days of receiving your buy order. The Fund will return any payment received for orders that have been cancelled, but no interest will be paid on that money.

■	Selling agents are responsible for sending your buy orders to the Transfer Agent and ensuring that we receive your money on time.

■	Shares purchased are recorded on the books of the Fund. The Fund does not issue certificates.

56	Prospectus 2016

Columbia Convertible Securities Fund

Buying, Selling and Exchanging Shares (continued)

Selling Shares

When you sell your shares, the Fund is effectively buying them back from you. This is called a redemption. The payment will be sent within seven days after your request is received in “good form.” When you sell shares, the amount you receive may be more or less than the amount you invested.

Your sale price will be the next NAV calculated after your request is received in “good form,” minus any applicable CDSC.

Systematic Withdrawal Plan

The Systematic Withdrawal Plan allows you to schedule regular redemptions from your account any business day on a monthly, quarterly or semiannual basis. Currently, Systematic Withdrawal Plans are generally available for Class A, Class B, Class C, Class R4, Class R5, Class T, Class W, Class Y and Class Z share accounts. Contact the Transfer Agent or your financial advisor to set up the plan. To set up the plan, your account balance must meet the class minimum initial investment amount. A Systematic Withdrawal Plan cannot be set up on an account that already has a Systematic Investment Plan established. If you set up the plan after you've opened your account, we may require your signature to be Medallion Signature Guaranteed.

You can choose to receive your withdrawals via check or direct deposit into your bank account. The Fund will deduct any applicable CDSC from the withdrawals before sending the balance to you. You can cancel the plan by giving the Fund 30 days’ notice in writing or by calling the Transfer Agent at 800.422.3737. It’s important to remember that if you withdraw more than your investment in the Fund is earning, you'll eventually withdraw your entire investment.

Check Redemption Service (for Columbia Money Market Fund)

Class A and Class Z shares of Columbia Money Market Fund (which is not offered in this prospectus) offer check writing privileges. If you have $2,000 in Columbia Money Market Fund, you may request checks which may be drawn against your account. The amount of any check drawn against your Columbia Money Market Fund must be at least $100. You can elect this service on your initial application or thereafter. Call 800.345.6611 for the appropriate forms to establish this service. If you own Class A shares that were originally purchased in another Fund at NAV because of the size of the purchase, and then exchanged into Columbia Money Market Fund, check redemptions may be subject to a CDSC. A $15 charge will be assessed for any stop payment order requested by you or any overdraft in connection with checks written against your Columbia Money Market Fund account. Note that a Medallion Signature Guarantee may be required if this service is established after the account is opened.

In-Kind Redemptions

The Fund reserves the right to honor redemption orders with in-kind distributions of portfolio securities instead of cash. In the event the Fund distributes portfolio securities in-kind, you may incur brokerage and transaction costs associated with converting the portfolio securities you receive into cash. Also, the portfolio securities you receive may increase or decrease in value before you convert them into cash. For U.S. federal income tax purposes redemptions paid in securities are generally treated the same as redemptions paid in cash.

Other Redemption Rules You Should Know

■	Once the Transfer Agent or your selling agent receives your redemption order in “good form,” your shares will be sold at the next calculated NAV per share. Any applicable CDSC will be deducted from the amount you're selling and the balance will be remitted to you.

■

If you sell your shares that are held directly with the Funds (through the Transfer Agent), we will normally send the redemption proceeds by mail or electronically transfer them to your bank account within three business days after the Transfer Agent or your selling agent receives your order in “good form.”

■	If you sell your shares through a selling agent, the Funds will normally send the redemption proceeds by Fedwire within three business days after the Transfer Agent or your selling agent receives your order in “good form.”

■	If you paid for your shares by check or from your bank account as an ACH transaction, the Funds will hold the redemption proceeds when you sell those shares for ten calendar days after the trade date of the purchase.

Prospectus 2016

57

Columbia Convertible Securities Fund

Buying, Selling and Exchanging Shares (continued)

■	No interest will be paid on uncashed redemption checks.

■	The Funds can delay payment of the redemption proceeds for up to seven days and may suspend redemptions and/or further postpone payment of redemption proceeds when the NYSE is closed or trading thereon is restricted or during emergency or other circumstances, including as determined by the SEC.

■	Other restrictions may apply to retirement accounts. For information about these restrictions, contact your retirement plan administrator.

■	For broker-dealer and wrap fee accounts: The Fund reserves the right to redeem your shares if your account falls below the Fund's minimum initial investment requirement. The Fund will notify your broker-dealer prior to redeeming shares, and will provide details on how to avoid such redemption.

■	Also keep in mind the Funds' Small Account Policy, which is described above in Buying, Selling and Exchanging Shares — Transaction Rules and Policies.

Exchanging Shares

You can generally sell shares of your Fund to buy shares of another Fund, in what is called an exchange. You should read the prospectus of, and make sure you understand the investment objective, principal investment strategies, risks, fees and expenses of, the Fund into which you are exchanging.

You may be subject to a sales charge if you exchange from Columbia Money Market Fund or any other Fund that does not charge a front-end sales charge into a non-money market Fund. If you hold your Fund shares through certain selling agents, including Ameriprise Financial Services, Inc., you may have limited exchangeability among the Funds. Please contact your selling agent for more information.

You can generally make exchanges between like share classes of any Fund and, subject to eligibility requirements, other share classes of any Fund. Some exceptions apply. Although the Funds allow certain exchanges from one share class to another share class with higher expenses, you should consider the expenses of each class before making such an exchange.

Systematic Exchanges

You may buy Class A, Class C, Class T, Class W, Class Y and/or Class Z shares of a Fund by exchanging each month from another Fund for shares of the same class of the Fund at no additional cost, subject to the following exchange amount minimums: $50 each month for individual retirement accounts (i.e. tax qualified accounts); and $100 each month for non-retirement accounts. Contact the Transfer Agent or your selling agent to set up the plan. If you set up your plan to exchange more than $100,000 each month, you must obtain a Medallion Signature Guarantee.

Exchanges will continue as long as your balance is sufficient to complete the systematic monthly transfers, subject to the Funds' Small Account Policy described above in Buying, Selling and Exchanging Shares — Transaction Rules and Policies. You may terminate the program or change the amount you would like to exchange (subject to the $50 and $100 minimum requirements noted immediately above) by calling the Transfer Agent at 800.345.6611. A sales charge may apply when you exchange shares of a Fund that were not assessed a sales charge at the time of your initial purchase.

Other Exchange Rules You Should Know

■	Exchanges are made at the NAV next calculated after your exchange order is received in “good form.”

■	Once the Fund receives your exchange request, you cannot cancel it after the market closes.

■	The rules for buying shares of a Fund generally apply to exchanges into that Fund, including, if your exchange creates a new Fund account, it must satisfy the minimum investment amount, unless a waiver applies.

■	Shares of the purchased Fund may not be used on the same day for another exchange or sale.

■

If you exchange shares from Class A shares of Columbia Money Market Fund to a non-money market Fund, any further exchanges must be between shares of the same class. For example, if you exchange from Class A shares of Columbia Money Market Fund into Class C shares of a non-money market Fund, you may not exchange from Class C shares of that non-money market Fund back to Class A shares of Columbia Money Market Fund.

58	Prospectus 2016

Columbia Convertible Securities Fund

Buying, Selling and Exchanging Shares (continued)

■

A sales charge may apply when you exchange shares of a Fund that were not assessed a sales charge at the time of your initial purchase. For example, if your initial investment was in Columbia Money Market Fund and you exchange into a non-money market Fund, your transaction is subject to a front-end sales charge if you exchange into Class A shares and to a CDSC if you exchange into Class C shares of the Funds.

■	If your initial investment was in Class A shares of a non-money market Fund and you exchange shares into Columbia Money Market Fund, you may exchange that amount to another Fund, including dividends earned on that amount, without paying a sales charge.

■

If your shares are subject to a CDSC, you will not be charged a CDSC upon the exchange of those shares. Any CDSC will be deducted when you sell the shares you received from the exchange. The CDSC imposed at that time will be based on the period that begins when you bought shares of the original Fund and ends when you sell the shares of the Fund you received from the exchange. The applicable CDSC will be the CDSC of the original Fund.

■	You may make exchanges only into a Fund that is legally offered and sold in your state of residence. Contact the Transfer Agent or your selling agent for more information.

■	You generally may make an exchange only into a Fund that is accepting investments.

■	The Fund may change or cancel your right to make an exchange by giving the amount of notice required by regulatory authorities (generally 60 days for a material change or cancellation).

■	Unless your account is part of a tax-advantaged arrangement, an exchange for shares of another Fund is a taxable event, and you may recognize a gain or loss for tax purposes.

■	Changing your investment to a different Fund will be treated as a sale and purchase, and you will be subject to applicable taxes on the sale and sales charges on the purchase of the new Fund.

■

Class Z shares of a Fund may be exchanged for Class A or Class Z shares of another Fund. In certain circumstances, the front-end sales charge applicable to Class A shares may be waived on exchanges of Class Z shares for Class A shares. See Buying, Selling and Exchanging Shares — Buying Shares — Eligible Investors — Class Z Shares for details.

■	You may generally exchange Class T shares of a Fund for Class A shares of another Fund if the other Fund does not offer Class T shares. Class T shares exchanged into Class A shares cannot be exchanged back into Class T shares.

■	Class W shares originally purchased, but no longer held, in a discretionary managed account, may not be exchanged for Class W shares of another Fund.

■	Former CFIT Shareholders may not exchange Class Y shares of a Fund into Class Y shares of another Fund.

Same-Fund Exchange Privilege

Certain shareholders of a Fund may be or become eligible to invest in other classes of shares of the same Fund. Upon a determination of such eligibility, such shareholders may be eligible to exchange their shares for shares of the other share class, if offered. Such exchanges include exchanges of shares of one class for shares of another share class with higher expenses. Before making such an exchange, you should consider the expenses of each class. Investors should contact their selling agents to learn more about the details of the exchange privilege.

Note the following rules relating to same-Fund exchanges:

■	No sales charges or other charges will apply to any such exchange, except that when Class B shares are exchanged, any CDSC applicable to Class B shares will be applied.

■	Ordinarily, shareholders will not recognize a gain or loss for U.S. federal income tax purposes upon such an exchange. You should consult your tax advisor about your particular exchanges.

Prospectus 2016

59

Columbia Convertible Securities Fund

Columbia Convertible Securities Fund

Distributions and Taxes (continued)

Unless you are a tax-exempt investor or holding Fund shares through a tax-advantaged account (such as a 401(k) plan or IRA), you should consider avoiding buying Fund shares shortly before the Fund makes a distribution (other than distributions of net investment income that are declared daily) of net investment income or net realized capital gain, because doing so can cost you money in taxes to the extent the distribution consists of taxable income or gains. This is because you will, in effect, receive part of your purchase price back in the distribution. This is known as “buying a dividend.” To avoid “buying a dividend,” before you invest check the Fund's distribution schedule, which is available at the Funds' website and/or by calling the Funds' telephone number listed at the beginning of the section entitled Choosing a Share Class .

Taxes

You should be aware of the following considerations applicable to all Funds (unless otherwise noted):

■

The Fund intends to qualify and to be eligible for treatment each year as a regulated investment company. A regulated investment company generally is not subject to tax at the fund level on income and gains from investments that are distributed to shareholders. However, the Fund's failure to qualify for treatment as a regulated investment company would result in Fund-level taxation, and consequently, a reduction in income available for distribution to you and in the net asset value of your shares. Even if the Fund qualifies for treatment as a regulated investment company, the Fund may be subject to federal excise tax on certain undistributed income or gains.

■

Otherwise taxable distributions generally are taxable to you when paid, whether they are paid in cash or automatically reinvested in additional Fund shares. Dividends paid in January are deemed paid on December 31 of the prior year if the dividend was declared and payable to shareholders of record in October, November, or December of such prior year.

■

Distributions of the Fund's ordinary income and net short-term capital gain, if any, generally are taxable to you as ordinary income. Distributions of the Fund's net long-term capital gain, if any, generally are taxable to you as long-term capital gain. Whether capital gains are long-term or short-term is determined by how long the Fund has owned the investments that generated them, rather than how long you have owned your shares.

■

From time to time, a distribution from the Fund could constitute a return of capital, which is not taxable to you so long as the amount of the distribution does not exceed your tax basis in your Fund shares. A return of capital reduces your tax basis in your Fund shares, with any amounts exceeding such basis generally taxable as capital gain.

■

If you are an individual and you meet certain holding period and other requirements for your Fund shares, a portion of your distributions may be treated as “qualified dividend income” taxable at the lower net long-term capital gain rates instead of the higher ordinary income rates. Qualified dividend income is income attributable to the Fund's dividends received from certain U.S. and foreign corporations, as long as the Fund meets certain holding period and other requirements for the stock producing such dividends.

■	Certain high-income individuals (as well as estates and trusts) are subject to a 3.8% tax on net investment income. For individuals, the 3.8% tax applies to the lesser of (1) the amount (if any) by which the taxpayer's modified adjusted gross income exceeds certain threshold amounts or (2) the taxpayer's “net investment income.”
	Net investment income generally includes for this purpose dividends, including any capital gain dividends, paid by the Fund, and net gains recognized on the sale, redemption or exchange of shares of the Fund.

■

Certain derivative instruments when held in the Fund's portfolio subject the Fund to special tax rules, the effect of which may be to, among other things, accelerate income to the Fund, defer Fund losses, cause adjustments in the holding periods of Fund portfolio securities, or convert capital gains into ordinary income, short-term capital losses into long-term capital losses or long-term capital gains into short-term capital gains. These rules could therefore affect the amount, timing and/or character of distributions to shareholders.

■	Generally, a Fund realizes a capital gain or loss on an option when the option expires, or when it is exercised, sold or otherwise terminated. However, if an option is a “section 1256 contract,” which includes most traded options

Prospectus 2016

61

Columbia Convertible Securities Fund

Distributions and Taxes (continued)

on a broad-based index, and the Fund holds such option at the end of its taxable year, the Fund is deemed to sell such option at fair market value at such time and recognize any gain or loss thereon, which is generally deemed to be 60% long-term and 40% short-term gain or loss, as described further in the SAI.

■

Income and proceeds received by the Fund from sources within foreign countries may be subject to foreign taxes. If at the end of the taxable year more than 50% of the value of the Fund's assets consists of securities of foreign corporations, and the Fund makes a special election, you will generally be required to include in your income for U.S. federal income tax purposes your share of the qualifying foreign income taxes paid by the Fund in respect of its foreign portfolio securities. You may be able to claim a foreign tax credit or deduction in respect of this amount, subject to certain limitations. There is no assurance that the Fund will make this election for a taxable year, even if it is eligible to do so.

■

A sale, redemption or exchange of Fund shares is a taxable event. This includes redemptions where you are paid in securities. Your sales, redemptions and exchanges of Fund shares (including those paid in securities) usually will result in a taxable capital gain or loss to you, equal to the difference between the amount you receive for your shares (or are deemed to have received in the case of exchanges) and your adjusted tax basis in the shares, which is generally the amount you paid (or are deemed to have paid in the case of exchanges) for them. Any such capital gain or loss generally will be long-term capital gain or loss if you have held your Fund shares for more than one year at the time of sale or exchange. In certain circumstances, capital losses may be converted from short-term to long-term; in other circumstances, capital losses may be disallowed under the “wash sale” rules.

■

For sales, redemptions and exchanges of shares that were acquired in a non-qualified account after 2011, the Fund generally is required to report to shareholders and the Internal Revenue Service (IRS) cost basis information with respect to those shares. The Fund uses average cost basis as its default method of calculating cost basis. For more information regarding average cost basis reporting, other available cost basis methods, and selecting or changing to a different cost basis method, please see the SAI, columbiathreadneedle.com/us, or contact the Fund at 800.345.6611. If you hold Fund shares through a selling agent (e.g., a brokerage firm), you should contact your selling agent to learn about its cost basis reporting default method and the reporting elections available to your account.

■

The Fund is required by federal law to withhold tax on any taxable or tax-exempt distributions and redemption proceeds paid to you (including amounts paid to you in securities and amounts deemed to be paid to you upon an exchange of shares) if: you have not provided a correct TIN or have not certified to the Fund that withholding does not apply, the IRS has notified us that the TIN listed on your account is incorrect according to its records, or the IRS informs the Fund that you are otherwise subject to backup withholding.

62	Prospectus 2016

Columbia Convertible Securities Fund

Columbia Convertible Securities Fund

Financial Highlights (continued)

	Year Ended February 29,	Year Ended February 28,			Year Ended February 29,
Class B	2016	2015	2014	2013	2012
Per share data
Net asset value, beginning of period	$19.15	$18.86	$15.40	$14.72	$15.28
Income from investment operations:
Net investment income	0.23	0.14	0.21	0.30	0.30
Net realized and unrealized gain (loss)	(3.17)	0.90	3.51	0.72	(0.55)
Total from investment operations	(2.94)	1.04	3.72	1.02	(0.25)
Less distributions to shareholders:
Net investment income	(0.61)	(0.29)	(0.26)	(0.34)	(0.31)
Net realized gains	(0.87)	(0.46)	—	—	—
Total distributions to shareholders	(1.48)	(0.75)	(0.26)	(0.34)	(0.31)
Proceeds from regulatory settlements	0.03	—	—	—	—
Net asset value, end of period	$14.76	$19.15	$18.86	$15.40	$14.72
Total return	(16.05%) (a)	5.65%	24.37%	7.10%	(1.53%)
Ratios to average net assets (b)
Total gross expenses	1.98% (c)	2.05% (c)	2.10%	2.13%	2.04%
Total net expenses (d)	1.86% (c)(e)	1.85% (c)(e)	1.88% (e)	1.89% (e)	1.88% (e)
Net investment income	1.29%	0.74%	1.23%	2.07%	2.04%
Supplemental data
Net assets, end of period (in thousands)	$326	$726	$911	$1,335	$3,102
Portfolio turnover	71%	78%	76%	71%	66%

  

Columbia Convertible Securities Fund

Financial Highlights (continued)

	Year Ended February 29,	Year Ended February 28,			Year Ended February 29,
Class C	2016	2015	2014	2013	2012
Per share data
Net asset value, beginning of period	$19.46	$19.16	$15.63	$14.95	$15.51
Income from investment operations:
Net investment income	0.25	0.14	0.21	0.30	0.31
Net realized and unrealized gain (loss)	(3.24)	0.91	3.58	0.72	(0.56)
Total from investment operations	(2.99)	1.05	3.79	1.02	(0.25)
Less distributions to shareholders:
Net investment income	(0.61)	(0.29)	(0.26)	(0.34)	(0.31)
Net realized gains	(0.87)	(0.46)	—	—	—
Total distributions to shareholders	(1.48)	(0.75)	(0.26)	(0.34)	(0.31)
Proceeds from regulatory settlements	0.03	—	—	—	—
Net asset value, end of period	$15.02	$19.46	$19.16	$15.63	$14.95
Total return	(16.06%) (a)	5.62%	24.46%	6.99%	(1.51%)
Ratios to average net assets (b)
Total gross expenses	1.99% (c)	2.05% (c)	2.10%	2.14%	2.02%
Total net expenses (d)	1.87% (c)(e)	1.85% (c)(e)	1.87% (e)	1.90% (e)	1.87% (e)
Net investment income	1.38%	0.74%	1.21%	2.05%	2.10%
Supplemental data
Net assets, end of period (in thousands)	$47,322	$54,655	$32,250	$17,617	$20,127
Portfolio turnover	71%	78%	76%	71%	66%

  

Columbia Convertible Securities Fund

Financial Highlights (continued)

	Year Ended February 29,	Year Ended February 28,			Year Ended February 29,
Class I	2016	2015	2014	2013	2012
Per share data
Net asset value, beginning of period	$19.58	$19.27	$15.72	$15.02	$15.58
Income from investment operations:
Net investment income	0.45	0.37	0.42	0.48	0.47
Net realized and unrealized gain (loss)	(3.24)	0.91	3.58	0.72	(0.57)
Total from investment operations	(2.79)	1.28	4.00	1.20	(0.10)
Less distributions to shareholders:
Net investment income	(0.83)	(0.51)	(0.45)	(0.50)	(0.46)
Net realized gains	(0.87)	(0.46)	—	—	—
Total distributions to shareholders	(1.70)	(0.97)	(0.45)	(0.50)	(0.46)
Proceeds from regulatory settlements	0.03	—	—	—	—
Net asset value, end of period	$15.12	$19.58	$19.27	$15.72	$15.02
Total return	(15.06%) (a)	6.88%	25.90%	8.29%	(0.43%)
Ratios to average net assets (b)
Total gross expenses	0.81% (c)	0.81% (c)	0.85%	0.89%	0.84%
Total net expenses (d)	0.71% (c)	0.68% (c)	0.69%	0.74%	0.77%
Net investment income	2.51%	1.91%	2.43%	3.21%	3.28%
Supplemental data
Net assets, end of period (in thousands)	$92,808	$97,006	$150,494	$180,374	$186,160
Portfolio turnover	71%	78%	76%	71%	66%

  

Columbia Convertible Securities Fund

Financial Highlights (continued)

	Year Ended February 29,	Year Ended February 28,			Year Ended February 29,
Class R	2016	2015	2014	2013	2012 (a)
Per share data
Net asset value, beginning of period	$19.51	$19.21	$15.67	$14.99	$13.80
Income from investment operations:
Net investment income	0.34	0.24	0.30	0.38	0.11
Net realized and unrealized gain (loss)	(3.24)	0.90	3.58	0.72	1.20 (b)
Total from investment operations	(2.90)	1.14	3.88	1.10	1.31
Less distributions to shareholders:
Net investment income	(0.71)	(0.38)	(0.34)	(0.42)	(0.12)
Net realized gains	(0.87)	(0.46)	—	—	—
Total distributions to shareholders	(1.58)	(0.84)	(0.34)	(0.42)	(0.12)
Proceeds from regulatory settlements	0.03	—	—	—	—
Net asset value, end of period	$15.06	$19.51	$19.21	$15.67	$14.99
Total return	(15.63%) (c)	6.13%	25.08%	7.55%	9.57%
Ratios to average net assets (d)
Total gross expenses	1.49% (e)	1.55% (e)	1.60%	1.64%	1.28% (f)
Total net expenses (g)	1.37% (e)(h)	1.35% (e)(h)	1.37% (h)	1.40% (h)	1.20% (f)
Net investment income	1.91%	1.24%	1.72%	2.56%	2.64% (f)
Supplemental data
Net assets, end of period (in thousands)	$2,429	$2,412	$2,423	$1,894	$2,068
Portfolio turnover	71%	78%	76%	71%	66%

  

Columbia Convertible Securities Fund

Financial Highlights (continued)

	Year Ended February 29,	Year Ended February 28,
Class R4	2016	2015	2014	2013 (a)
Per share data
Net asset value, beginning of period	$19.69	$19.37	$15.80	$14.75
Income from investment operations:
Net investment income	0.45	0.33	0.37	0.14
Net realized and unrealized gain (loss)	(3.29)	0.93	3.62	1.04
Total from investment operations	(2.84)	1.26	3.99	1.18
Less distributions to shareholders:
Net investment income	(0.80)	(0.48)	(0.42)	(0.13)
Net realized gains	(0.87)	(0.46)	—	—
Total distributions to shareholders	(1.67)	(0.94)	(0.42)	(0.13)
Proceeds from regulatory settlements	0.03	—	—	—
Net asset value, end of period	$15.21	$19.69	$19.37	$15.80
Total return	(15.21%) (b)	6.71%	25.68%	8.05%
Ratios to average net assets (c)
Total gross expenses	1.00% (d)	1.05% (d)	1.10%	1.24% (e)
Total net expenses (f)	0.87% (d)(g)	0.85% (d)(g)	0.85% (g)	0.92% (e)
Net investment income	2.59%	1.74%	2.09%	2.96% (e)
Supplemental data
Net assets, end of period (in thousands)	$14,556	$3,027	$685	$3
Portfolio turnover	71%	78%	76%	71%

  

Columbia Convertible Securities Fund

Financial Highlights (continued)

	Year Ended February 29,	Year Ended February 28,
Class R5	2016	2015	2014	2013 (a)
Per share data
Net asset value, beginning of period	$19.68	$19.37	$15.80	$14.75
Income from investment operations:
Net investment income	0.45	0.35	0.40	0.14
Net realized and unrealized gain (loss)	(3.27)	0.92	3.62	1.04
Total from investment operations	(2.82)	1.27	4.02	1.18
Less distributions to shareholders:
Net investment income	(0.82)	(0.50)	(0.45)	(0.13)
Net realized gains	(0.87)	(0.46)	—	—
Total distributions to shareholders	(1.69)	(0.96)	(0.45)	(0.13)
Proceeds from regulatory settlements	0.03	—	—	—
Net asset value, end of period	$15.20	$19.68	$19.37	$15.80
Total return	(15.13%) (b)	6.80%	25.86%	8.08%
Ratios to average net assets (c)
Total gross expenses	0.87% (d)	0.86% (d)	0.90%	1.01% (e)
Total net expenses (f)	0.76% (d)	0.73% (d)	0.71%	0.79% (e)
Net investment income	2.48%	1.86%	2.25%	3.09% (e)
Supplemental data
Net assets, end of period (in thousands)	$38,717	$35,859	$946	$3
Portfolio turnover	71%	78%	76%	71%

  

Columbia Convertible Securities Fund

Financial Highlights (continued)

	Year Ended February 29,	Year Ended February 28,			Year Ended February 29,
Class W	2016	2015	2014	2013	2012 (a)
Per share data
Net asset value, beginning of period	$19.48	$19.20	$15.66	$14.98	$13.80
Income from investment operations:
Net investment income	0.38	0.31	0.34	0.42	0.14
Net realized and unrealized gain (loss)	(3.23)	0.87	3.58	0.72	1.17 (b)
Total from investment operations	(2.85)	1.18	3.92	1.14	1.31
Less distributions to shareholders:
Net investment income	(0.76)	(0.44)	(0.38)	(0.46)	(0.13)
Net realized gains	(0.87)	(0.46)	—	—	—
Total distributions to shareholders	(1.63)	(0.90)	(0.38)	(0.46)	(0.13)
Proceeds from regulatory settlements	0.03	—	—	—	—
Net asset value, end of period	$15.03	$19.48	$19.20	$15.66	$14.98
Total return	(15.43%) (c)	6.33%	25.41%	7.87%	9.56%
Ratios to average net assets (d)
Total gross expenses	1.23% (e)	1.25% (e)	1.35%	1.39%	0.85% (f)
Total net expenses (g)	1.11% (e)(h)	1.05% (e)(h)	1.12% (h)	1.15% (h)	0.77% (f)
Net investment income	2.07%	1.55%	1.98%	2.83%	3.44% (f)
Supplemental data
Net assets, end of period (in thousands)	$79	$130	$28,153	$26,640	$28,830
Portfolio turnover	71%	78%	76%	71%	66%

  

Columbia Convertible Securities Fund

Financial Highlights (continued)

Class Y	Year Ended February 29, 2016	Year Ended February 29, 2015 (a)
Per share data
Net asset value, beginning of period	$19.81	$19.21
Income from investment operations:
Net investment income	0.51	0.13
Net realized and unrealized gain (loss)	(3.34)	0.90
Total from investment operations	(2.83)	1.03
Less distributions to shareholders:
Net investment income	(0.83)	(0.13)
Net realized gains	(0.87)	(0.30)
Total distributions to shareholders	(1.70)	(0.43)
Proceeds from regulatory settlements	0.03	—
Net asset value, end of period	$15.31	$19.81
Total return	(15.09%) (b)	5.48%
Ratios to average net assets (c)
Total gross expenses	0.84% (d)	0.81% (d)(e)
Total net expenses (f)	0.72% (d)	0.69% (d)(e)
Net investment income	3.01%	1.88% (e)
Supplemental data
Net assets, end of period (in thousands)	$812	$61
Portfolio turnover	71%	78%

  

Columbia Convertible Securities Fund

Financial Highlights (continued)

	Year Ended February 29,	Year Ended February 28,			Year Ended February 29,
Class Z	2016	2015	2014	2013	2012
Per share data
Net asset value, beginning of period	$19.56	$19.25	$15.70	$15.01	$15.58
Income from investment operations:
Net investment income	0.42	0.33	0.38	0.45	0.45
Net realized and unrealized gain (loss)	(3.24)	0.92	3.59	0.73	(0.57)
Total from investment operations	(2.82)	1.25	3.97	1.18	(0.12)
Less distributions to shareholders:
Net investment income	(0.80)	(0.48)	(0.42)	(0.49)	(0.45)
Net realized gains	(0.87)	(0.46)	—	—	—
Total distributions to shareholders	(1.67)	(0.94)	(0.42)	(0.49)	(0.45)
Proceeds from regulatory settlements	0.03	—	—	—	—
Net asset value, end of period	$15.10	$19.56	$19.25	$15.70	$15.01
Total return	(15.21%) (a)	6.70%	25.72%	8.10%	(0.56%)
Ratios to average net assets (b)
Total gross expenses	0.98% (c)	1.05% (c)	1.10%	1.14%	1.02%
Total net expenses (d)	0.86% (c)(e)	0.85% (c)(e)	0.87% (e)	0.90% (e)	0.87% (e)
Net investment income	2.27%	1.74%	2.18%	3.06%	3.08%
Supplemental data
Net assets, end of period (in thousands)	$203,574	$816,941	$465,328	$120,906	$130,380
Portfolio turnover	71%	78%	76%	71%	66%

  

72	Prospectus 2016

[This page intentionally left blank]

  

[This page intentionally left blank]

  

[This page intentionally left blank]

Columbia Convertible Securities Fund

P.O. Box 8081
Boston, MA 02266-8081

Prospectus

July 1, 2016

 

Columbia Large Cap Enhanced Core Fund

    

Class		Ticker Symbol
Class A Shares		NMIAX
Class I Shares		CCEIX
Class R Shares		CCERX
Class R4 Shares		CECFX
Class R5 Shares		CLNCX
Class Y Shares		CECYX
Class Z Shares		NMIMX

As with all mutual funds, the Securities and Exchange Commission (SEC) has not approved or disapproved these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

Columbia Large Cap Enhanced Core Fund

Summary of the Fund

Columbia Large Cap Enhanced Core Fund

Summary of the Fund (continued)

Convertible Securities Risk. Convertible securities are subject to the usual risks associated with debt instruments, such as interest rate risk and credit risk. Convertible securities also react to changes in the value of the common stock into which they convert, and are thus subject to market risk. The Fund may also be forced to convert a convertible security at an inopportune time, which may decrease the Fund’s return.

Derivatives Risk. Derivatives may involve significant risks. Derivatives are financial instruments with a value in relation to, or derived from, the value of an underlying asset(s) or other reference, such as an index, rate or other economic indicator (each an underlying reference). Derivatives may include those that are privately placed or otherwise exempt from SEC registration, including that certain Rule 144A eligible securities may be derivatives. Derivatives could result in Fund losses if the underlying reference does not perform as anticipated. Use of derivatives is a highly specialized activity that can involve investment techniques, risks, and tax planning different from those associated with more traditional investment instruments. A Fund’s derivatives strategy may not be successful and use of certain derivatives could result in substantial, potentially unlimited, losses to the Fund regardless of the Fund’s actual investment. A relatively small movement in the price, rate or other economic indicator associated with the underlying reference may result in substantial loss for the Fund. Derivatives may be more volatile than other types of investments. The value of derivatives may be influenced by a variety of factors, including national and international political and economic developments. Potential changes to the regulation of the derivatives markets may make derivatives more costly, may limit the market for derivatives, or may otherwise adversely affect the value or performance of derivatives. Derivatives can increase the Fund’s risk exposure to underlying references and their attendant risks, such as credit risk, market risk, foreign currency risk and interest rate risk, while exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Derivatives Risk – Futures Contracts Risk. A futures contract is an exchange-traded derivative transaction between two parties in which a buyer (holding the “long” position) agrees to pay a fixed price (or rate) at a specified future date for delivery of an underlying reference from a seller (holding the “short” position). The seller hopes that the market price on the delivery date is less than the agreed upon price, while the buyer hopes for the contrary. Certain futures contract markets are highly volatile, and futures contracts may be illiquid. Futures exchanges may limit fluctuations in futures contract prices by imposing a maximum permissible daily price movement. The Fund may be disadvantaged if it is prohibited from executing a trade outside the daily permissible price movement. At or prior to maturity of a futures contract, the Fund may enter into an offsetting contract and may incur a loss to the extent there has been adverse movement in futures contract prices. The liquidity of the futures markets depends on participants entering into offsetting transactions rather than making or taking delivery. To the extent participants make or take delivery, liquidity in the futures market could be reduced. Because of the low margin deposits normally required in futures trading, a high degree of leverage is typical of a futures trading account. As a result, a relatively small price movement in a futures contract may result in substantial losses to the Fund, exceeding the amount of the margin paid. For certain types of futures contracts, losses are potentially unlimited. Futures markets are highly volatile and the use of futures may increase the volatility of the Fund’s net asset value. Futures contracts executed on foreign exchanges may not provide the same protection as U.S. exchanges. Futures contracts can increase the Fund’s risk exposure to underlying references and their attendant risks, such as credit risk, market risk, foreign currency risk and interest rate risk, while also exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Issuer Risk. An issuer in which the Fund invests or to which it has exposure may perform poorly, and the value of its securities may therefore decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors.

Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or long periods.

Quantitative Model Risk. Investments selected using quantitative methods may perform differently from the market as a whole. There can be no assurance that these methodologies will enable the Fund to achieve its objective.

Prospectus 2016

5