Buying, Selling and Exchanging Shares

Share Price Determination

The price you pay or receive when you buy, sell or exchange shares is the Fund’s next determined net asset value (or NAV) per share for a given share class. The Fund calculates the NAV per share for each class of shares of the Fund at the end of each business day.

Business Days

A business day is any day that the New York Stock Exchange (NYSE) is open. A business day ends at the close of regular trading on the NYSE, usually at 4:00 p.m. Eastern time. If the NYSE closes early, the business day ends as of the time the NYSE closes. On holidays and other days when the NYSE is closed, the Fund’s NAV is not calculated and the Fund does not accept buy or sell orders. However, the value of the Fund’s assets may still be affected on such days to the extent that the Fund holds foreign securities that trade on days that foreign securities markets are open.

Equity securities are valued primarily on the basis of market quotations reported on stock exchanges and other securities markets around the world. If an equity security is listed on a national exchange, the security is valued at the closing price or, if the closing price is not readily available, the mean of the closing bid and asked prices. Certain equity securities, debt securities and other assets are valued differently. For instance, bank loans trading in the secondary market are valued primarily on the basis of indicative bids, fixed-income investments maturing in 60 days or less are valued primarily using the amortized cost method and those maturing in excess of 60 days are valued at the readily available market price, if available. Investments in other open-end funds are valued at their NAVs. Both market quotations and indicative bids are obtained from outside pricing services approved and monitored pursuant to a policy approved by the Fund’s Board. For a money market fund, the Fund’s investments are valued at amortized cost, which approximates market value.

If a market price isn’t readily available or is deemed not to reflect market value, the Fund will determine the price of the security held by the Fund based on a determination of the security’s fair value pursuant to a policy approved by the Fund’s Board. In addition, the Fund may use fair valuation to price securities that trade on a foreign exchange when a significant event has occurred after the foreign exchange closes but before the time at which the Fund’s share price is calculated. Foreign exchanges typically close before the time at which Fund share prices are calculated, and may be closed altogether on some days when the Fund is open. Such significant events affecting a foreign security may include, but are not limited to: (1) corporate actions, earnings announcements, litigation or other events impacting a single issuer; (2) governmental action that affects securities in one sector or country; (3) natural disasters or armed conflicts affecting a country or region; or (4) significant domestic or foreign market fluctuations. The Fund uses various criteria, including an evaluation of U.S. market moves after the close of foreign markets, in determining whether a foreign security’s market price is readily available and reflective of market value and, if not, the fair value of the security. To the extent the Fund has significant holdings of small cap stocks, high yield bonds, floating rate loans, or tax-exempt, foreign or other securities that may trade infrequently, fair valuation may be used more frequently than for other funds.

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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 (as described below) for amounts greater than $100,000 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

A Medallion Signature Guarantee helps assure that a signature is genuine and not a forgery. The selling agent providing the Medallion Signature Guarantee is financially liable for the transaction if the signature is a forgery.

A Medallion Signature Guarantee is required if:

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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 address(es)) 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

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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, 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 address(es)) 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

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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.

These limits generally do not apply to automated transactions or transactions by registered investment companies that invest in the Fund using 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.

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 and 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:

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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 don’t work fully, investors engaging in price arbitrage may cause dilution in the value of the Fund’s shares held by other shareholders.

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 the 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 buy or exchange transactions. In addition, Columbia Money Market Fund reserves the right to impose or modify restrictions on purchases, exchanges or trading of the Fund shares at any time.

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.

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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 one of these selling agents to carry out its obligations to its customers.

The Fund may engage selling agents to receive purchase orders and exchange (and sale) 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.

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 columbiamanagement.com 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.

Mail your check and completed application to the Transfer Agent at its 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.

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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 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 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.

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 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 electronic fund transfers, a bank authorization, or check that are not guaranteed may take up to 10 or more 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

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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.

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 transact directly with the Fund or the Transfer Agent through a third party administrator or third party recordkeeper. The 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):

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 their 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.

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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-fund 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 Internal Revenue 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 Internal Revenue 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.

Prior to October 25, 2012, Class K shares were named Class R4 shares.

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.

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Prior to October 31, 2012, Class R4 shares were named Class R3 shares.

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 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 various Legacy Columbia Funds (formerly 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 below, are available only to (i) omnibus retirement plans with plan assets of at least $10 million as of the date of funding the Fund account (without a minimum initial investment amount) and (ii) omnibus retirement plans with plan assets of less than $10 million as of the date of funding the Fund account, provided that such plans invest $500,000 or more in Class Y shares of the Fund. As with other minimum initial investment requirements, the Distributor may, in its sole discretion, waive the minimum initial investment requirement for Class Y shares.

Prior to November 8, 2012, Class Y shares were offered only to certain former shareholders of series of the former Columbia Funds Institutional Trust (together, Former CFIT Shareholders). Former CFIT Shareholders who opened and funded a Class Y account with a Fund as of the close of business on November 7, 2012 may continue to make additional purchases of Class Y shares even if they do not satisfy the current eligibility requirements but may not establish new Class Y shares accounts and will not be eligible to exchange Class Y shares of a Fund into Class Y shares of other Funds. Former CFIT Shareholders may exchange Class Y shares of a Fund for Class Z shares of the same Fund or Class Z shares of another Fund, subject to applicable minimum investments.

Class Z Shares

Class Z shares are available only to the categories of eligible investors described below under Class Z Shares Minimum Initial Investments . 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

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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 continuously hold Class Z shares in such account after March 28, 2013, 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 after March 28, 2013 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 after March 28, 2013 so long as the initial Class Z account is funded by July 2, 2013.

Effective March 29, 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 have received specific written notice from the Transfer Agent of the termination 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). Effective March 29, 2013, 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.

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Minimum Initial Investments

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

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.