Management

The Adviser. Gabelli Funds, LLC

The Portfolio Managers. Mr. Mario J. Gabelli, CFA, Chief Investment Officer — Value Portfolios of the Adviser, has served as portfolio manager of the Fund since its inception on August 31, 1999. Mr. Timothy M. Winter, CFA, has served as an associate portfolio manager of the Fund since May 2018. Mr. Jose Garza has served as an associate portfolio manager of the Fund since January 1, 2020.

Purchase and Sale of Fund Shares

The minimum initial investment for Class AAA, Class A, and Class C shares is $1,000 ($250 for IRAs or Coverdell Education Savings Plans). There is no minimum initial investment for Class AAA, Class A, and Class C shares in an automatic monthly investment plan. Class I shares are available to investors with a minimum investment of $500,000 when purchasing the shares directly through G.distributors, LLC, the Fund’s distributor (“G.distributors” or the “Distributor”), or investors purchasing Class I shares through brokers or financial intermediaries that have entered into selling agreements with the Distributor specifically with respect to Class I shares, and which have different minimum investment amounts. If you transact in Class I shares through a broker or financial intermediary, you may be required to pay a commission and/or other forms of compensation to the broker or financial intermediary. The Distributor reserves the right to waive or change minimum investment amounts. There is no minimum for subsequent investments.

You can purchase or redeem shares of the Fund on any day the New York Stock Exchange (“NYSE”) is open for trading (a “Business Day”). You may purchase or redeem Fund shares by written request via mail (The Gabelli Funds, P.O. Box 219204, Kansas City, MO 64121-9204), personal or overnight delivery

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(The Gabelli Funds, c/o DST Asset Manager Solutions, Inc., 430 W 7th Street, STE 219204, Kansas City, MO 64105-1407), Internet, bank wire, or Automated Clearing House (“ACH”) system. You may also purchase Fund shares by telephone at 800-GABELLI (800-422-3554), if you have an existing account with banking instructions on file.

Fund shares can also be purchased or sold through registered broker-dealers or financial intermediaries that have entered into appropriate selling agreements with the Distributor. The broker-dealer or other financial intermediary will transmit these transaction orders to the Fund on your behalf and send you confirmation of your transactions and periodic account statements showing your investments in the Fund.

Tax Information

The Fund expects that distributions will generally be taxable as ordinary income or long term capital gains, unless you are investing through a tax deferred arrangement, such as a 401(k) plan or an IRA.

Payments to Broker-Dealers and Other Financial Intermediaries

If you purchase shares of the Fund through a broker-dealer or other financial intermediary (such as a bank), the Fund and its related companies may pay the intermediary for the sale of the Fund shares and related services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary’s website for more information.

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MANAGEMENT OF THE FUND

The Adviser.    Gabelli Funds, LLC, with its principal offices located at One Corporate Center, Rye, New York 10580-1422, is a New York limited liability company that serves as investment adviser to the Fund. The Adviser makes investment decisions for the Fund and continuously reviews and administers the Fund’s investment program and manages the Fund’s operations under the general supervision of the Fund’s Board. The Adviser also manages several other open-end and closed-end investment companies in the Gabelli/GAMCO family of funds (“Gabelli/GAMCO Fund Complex” or “Fund Complex”). The Adviser is a wholly owned subsidiary of GAMCO Investors, Inc. (“GBL”), a publicly held company listed on the NYSE.

As compensation for its services and related expenses borne by the Adviser for the fiscal year ended December 31, 2019, the Fund paid the Adviser a fee computed daily and payable monthly equal to 1.00% of the value of the Fund’s average daily net assets.

The Fund’s semiannual report to shareholders for the period ended June 30, 2019 contains a discussion of the basis of the Board’s determination to continue the investment advisory agreement.

The Portfolio Managers.    Mr. Mario J. Gabelli, CFA, is primarily responsible for the day to day investment management of the Fund. Mr. Gabelli is Chairman and Chief Executive Officer of GBL and Associated Capital Group, Inc.; Chief Investment Officer — Value Portfolios of GBL, Gabelli Funds, LLC, and GAMCO Asset Management, Inc., another wholly owned subsidiary of GBL; Chief Executive Officer and Chief Investment Officer of GGCP, Inc.; and an officer or director of other companies affiliated with GBL. The Adviser relies to a considerable extent on the expertise of Mr. Gabelli, who may be difficult to replace in the event of his death, disability, or resignation.

Mr. Timothy M. Winter, CFA, has served as portfolio manager of the Fund since May 2018. He joined Gabelli & Company in April of 2009 and covers the utility industry. He has over 20 years’ experience as an equity research analyst covering this industry, including the years 1992-2007 at AG Edwards from where he received industry recognition as a 3 time Wall Street Journal All-Star and was a senior member of the Institutional Investor (I.I.) #1 ranked Electric Utility Team for the years 2001, 2002, 2003, 2004 and 2005. He was most recently recognized in the 2017 Thomson Reuters US Analyst Awards as a “Top Stock Picker” in the gas utility industry. Mr. Winter received his B.A. in Economics in 1991 from Rollins College and M.B.A. in Finance from Notre Dame in 1992.

Mr. Jose Garza has served as portfolio manager of the Fund since January 1, 2020. He is a portfolio manager and analyst for Gabelli Funds. Mr. Garza began his career G.research, LLC in 2007 as a member of the Utilities research team and rejoined in July 2013 as a research analyst covering water, industrial gas, and analytical instrument companies. Mr. Garza graduated from Yale University with a dual B.A. in Economics and Biology and holds an M.B.A. from Columbia Business School.

The Fund’s SAI provides additional information about the portfolio managers’ compensation, other accounts managed by them, and their ownership of securities, if any, in the Fund.

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INDEX DESCRIPTIONS

The S&P 500 Utilities Index is an unmanaged market capitalization-weighted index consisting of the 49 gas, electric, and telephone stocks that are included in the S&P 500 Index, a market capitalization-weighted index of common stocks. The index figures do not reflect any deduction for fees, expenses, or taxes. You cannot invest directly in the S&P 500 Utilities Index.

The Lipper Utility Fund Average reflects the average performance of mutual funds classified in this particular category.

CLASSES OF SHARES

Four classes of the Fund’s shares are offered in this prospectus — Class AAA shares, Class A shares, Class C shares, and Class I shares. The Fund is not designed for market timers; see the section entitled “Redemption of Shares.” Each class of shares has different costs associated with buying, selling, and holding Fund shares. Your broker or other financial professional can assist you in selecting which class of shares best meets your needs based on such factors as the size of your investments and the length of time you intend to hold your shares.

The minimum initial investment for Class AAA, Class A, and Class C shares is $1,000.

The Fund’s Class AAA shares are offered only to (1) clients of broker-dealers or other financial intermediaries (i) that charge such clients an ongoing fee for advisory, investment, consulting, or similar service or (ii) where the Distributor has entered into an agreement permitting the financial intermediary to offer Class AAA shares through its mutual fund supermarket network or platform, and (2) customers of the Distributor.

Class I shares are available to investors with a minimum investment of $500,000 and purchasing shares directly through the Distributor, or investors purchasing Class I shares through brokers or financial intermediaries that have entered into selling agreements with the Distributor specifically with respect to Class I shares. Such brokers or financial intermediaries may have different requirements as to the investment minimum. If you transact in Class I shares through a broker or financial intermediary, you may be required to pay a commission and/or other forms of compensation to the broker or financial intermediary.

The Distributor or its affiliates may, in their discretion, accept investments from purchasers that do not meet the qualification requirements.

There is no minimum for subsequent investments.

The table that follows summarizes the differences among the classes of shares.

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In selecting a class of shares in which to invest, you should consider:

The following sections and Appendix A to this prospectus include important information about sales charges and sales charge reductions and waivers, and describe information or records you may need to provide to the Fund or your broker in order to be eligible for sales charge reductions and waivers. Intermediaries may have different policies and procedures regarding the availability of sales charge reductions and waivers; please refer to Appendix A to this prospectus, which describes all such intermediaries. Information about sales charges and sales charge reductions and waivers to the various classes of the Fund’s shares is also available free of charge and in a clear and prominent format on our

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website at www.gabelli.com. You should consider the information below as a guide only, as the decision on which share class is best for you depends on your individual needs and circumstances.

Sales Charge — Class A Shares.    Unless you are eligible for a sales charge reduction or a waiver as set forth in Appendix A to this prospectus, the sales charge is imposed on Class A shares at the time of purchase in accordance with the following schedule. It is the purchaser’s responsibility to notify the Fund, the Distributor, or the purchaser’s financial intermediary at the time of purchase of any relationship or other facts qualifying the purchaser for sales charge reductions or waivers.

No sales charge is imposed on reinvestment of dividends and distributions if you selected that option in advance of the distributions.

Breakpoints or Volume Discounts

The Fund offers you the benefit of discounts on the sales charges that apply to purchases of Class A shares in certain circumstances. These discounts, which are also known as breakpoints, can reduce or, in some instances, eliminate the initial sales charges that would otherwise apply to your Class A shares investment. Mutual funds are not required to offer breakpoints and different mutual fund groups may offer different types of breakpoints.

Breakpoints or volume discounts allow larger investments in Class A shares to be charged lower sales charges. If you invest $50,000 or more in Class A shares of the Fund, then you are eligible for a reduced sales charge. Initial sales charges are eliminated completely for purchases of $1,000,000 or more,

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although a 1% CDSC may apply if shares are redeemed up to and including the last day of the eighteenth month after purchase.

Sales Charge Reductions and Waivers — Class A Shares

Reduced sales charges are available to (1) investors who are eligible to combine their purchases of Class A shares to receive volume discounts and (2) investors who sign a Letter of Intent (“Letter”) agreeing to make purchases over time. Certain types of investors, as set forth below, are eligible for sales charge waivers.

Class A shares may be available for purchase by clients of certain financial intermediaries without the application of a front-end sales load, as described in Appendix A to the prospectus.

You may qualify for a reduced sales charge, or a waiver of sales charges, on purchases of Class A shares. The requirements are described in the following paragraphs. To receive a reduction that you qualify for, you may have to provide additional information to your broker or other service agent. For more information about sales charge discounts and waivers, consult with your broker or other service provider.

Volume Discounts/Rights of Accumulation.    In order to determine whether you qualify for a volume discount under the foregoing sales charge schedule, you may combine your new investment and your existing investments in Class A shares with those of your immediate family (spouse and children under age 21), your and their IRAs, and other employee benefit plans and trusts and other fiduciary accounts for your and their benefit. You may also include Class A shares of any other open-end investment company managed by the Adviser or its affiliates that are held in any of the foregoing accounts. The Fund uses the current net asset value per share (“NAV”) of these holdings when combining them with your new and existing investments for purposes of determining whether you qualify for a volume discount.

Letter of Intent.    If you initially invest at least $1,000 in Class A shares of the Fund and submit a Letter to your financial intermediary or the Distributor, you may make purchases of Class A shares of the Fund during a thirteen-month period at the reduced sales charge rates applicable to the aggregate amount of the intended purchases stated in the Letter. The Letter may apply to purchases made up to ninety days before the date of the Letter. If you fail to invest the total amount stated in the Letter, the Fund will retroactively collect the sales charge otherwise applicable by redeeming shares in your account at their then current NAV. For more information on the Letter, call your broker.

Required Shareholder Information and Records.    In order for you to take advantage of sales charge reductions, you or your broker must notify the Fund that you qualify for a reduction. Without notification, the Fund is unable to ensure that the reduction is applied to your account. You may have to provide information or records to your broker or the Fund to verify eligibility for breakpoint privileges or other sales charge waivers. This may include information or records, including account statements, regarding shares of the Fund or shares of any other open-end investment company managed by the Adviser or its affiliates held in:

You should therefore keep copies of these types of records.

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Investors Eligible for Sales Charge Waivers.    Class A shares of the Fund may be offered without a sales charge to: (1) employees of the Distributor and its affiliates, The Bank of New York Mellon Corporation, DST Asset Manager Solutions, Inc. (“DST” or the “Transfer Agent”), State Street Bank and Trust Company, (“State Street”), BNY Mellon Investment Servicing (US) Inc., and Soliciting Broker-Dealers, employee benefit plans for those employees and their spouses and minor children of such employees when orders on their behalf are placed by such employees (the minimum initial investment for such purchases is $500); (2) the Adviser, its affiliates and their officers, directors, trustees, general partners, and employees of other investment companies managed by the Adviser, employee benefit plans for such persons and their immediate family when orders on their behalf are placed by such persons (with no required minimum initial investment) — the term “immediate family” for this purpose refers to a person’s spouse, children and grandchildren (adopted or natural), parents, grandparents, siblings, a spouse’s siblings, a sibling’s spouse, and a sibling’s children; (3) any other investment company in connection with the combination of such company with the Fund by merger, acquisition of assets, or otherwise; (4) shareholders who have redeemed shares in the Fund and who wish to reinvest in the Fund, provided the reinvestment is made within ninety days of the redemption; (5) employee benefit plans; (6) any unit investment trusts registered under the 1940 Act which have shares of the Fund as a principal investment; (7) investment advisory clients of GAMCO Asset Management, Inc. and their immediate families; (8) financial institutions purchasing Class A shares of the Fund for clients participating in a fee based asset allocation program or wrap fee program; and (9) investment advisers or financial planners who place trades for their own accounts or the accounts of their clients and who charge a management, consulting, or other fee for their services; and clients of such investment advisers or financial planners who place trades for their own accounts if the accounts are linked to the master account of such investment adviser or financial planner on the books and records of a broker or financial intermediary.

Additional categories of sales charge reductions and waivers are also set out in Appendix A to this prospectus.

Investors who qualify under any of the categories described above or those set out in the Appendix A to this prospectus should contact their broker or financial intermediary. Some of these investors may also qualify to invest in Class I shares.

Contingent Deferred Sales Charges

You will pay a CDSC when you redeem:

The CDSCs payable upon redemption of Class A shares in the circumstances described above are 1.00% for investments of $1 million but less than $2 million, 0.50% for investments of $2 million but less than $5 million, and 0.25% for investments of $5 million or more. The CDSC payable upon redemption of Class C shares in the circumstances described above is 1.00%. In each case, the CDSC is based on the NAV at the time of your investment or the NAV at the time of redemption, whichever is lower.

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The Distributor pays sales commissions of up to 1.00% of the purchase price of Class C shares of the Fund at the time of sale to brokers and financial intermediaries that initiate and are responsible for purchases of such Class C shares of the Fund.

You will not pay a CDSC to the extent that the value of the redeemed shares represents reinvestment of distributions or capital appreciation of shares redeemed. When you redeem shares, we will assume that you are first redeeming shares representing reinvestment of dividends and capital gain distributions, then any appreciation on shares redeemed, and then any remaining shares held by you for the longest period of time. We will calculate the holding period of shares acquired through an exchange of shares of another fund from the date you acquired the original shares of the other fund. The time you hold shares in the Gabelli money market fund, however, will not count for purposes of calculating the applicable CDSC.

We will waive the CDSC payable upon redemptions of shares for:

The CDSC may be waived if you purchase your shares through intermediaries identified in Appendix A to this prospectus.

Rule 12b-1 Plan.    The Fund has adopted distribution plans under Rule 12b-1 for Class AAA, Class A, and Class C shares of the Fund (“Plans” or each, a “Plan”). Under these Plans, the Fund may use its assets to finance activities relating to the sale of its Class AAA, Class A, and Class C shares and the provision of certain shareholder services. To the extent any activity is one that the Fund may finance without a distribution plan, the Fund may also make payments to compensate for such activities outside a Plan and not be subject to its limitations.

The Class AAA and Class A Plans authorize payments by the Fund at an annual rate of 0.25% of its average daily net assets attributable to Class AAA and Class A shares to finance distribution of its Class AAA and Class A shares or pay shareholder service fees. The Class C Plan authorizes payments by the Fund at an annual rate of 0.75% of its average daily net assets attributable to Class C shares to finance distribution of its Class C shares and 0.25% for shareholder service fees.

Because the Rule 12b-1 fees are higher for Class C shares than for Class AAA or Class A shares, Class C shares will have higher annual expenses. Because Rule 12b-1 fees are paid out of the Fund’s assets on an ongoing basis, over time these fees will increase the cost of your investment and may cost you more than paying other types of sales charges. Due to the payment of Rule 12b-1 fees, long term shareholders may indirectly pay more than the equivalent of the maximum permitted front-end sales charge.

Redemption Fee.    Generally, if you sell or exchange your shares within seven days or less after the purchase date, you will be charged a redemption fee of 2.00% of the total redemption amount which is payable to the Fund. See “Redemption of Shares” herein.

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PURCHASE OF SHARES

You can purchase the Fund’s shares on any Business Day.

You can obtain a subscription order form by calling 800-GABELLI (800-422-3554). Checks made payable to a third party and endorsed by the shareholder are not acceptable. For additional investments, send a check to the above address with a note stating your exact name and account number, the name of the fund(s), and class of shares you wish to purchase.

State Street Bank and Trust Company

225 Franklin Street, Boston, MA 02110

ABA #011-0000-28 REF DDA #99046187

Re: The Gabelli Utilities Fund

Account #                            

Account of [Registered Owners]

If you are making an initial purchase, you should also complete and mail a subscription order form to the address shown under “By Mail.” Note that banks may charge fees for wiring funds, although the Fund’s transfer agent, DST, will not charge you for receiving wire transfers.

You may purchase shares directly through registered broker-dealers or other financial intermediaries that have entered into appropriate selling agreements with the Distributor.

Your broker-dealer or financial intermediary can obtain a subscription order form by calling 800-GABELLI (800-422-3554). The broker-dealer or other financial intermediary will transmit a purchase order and payment to DST on your behalf. Broker-dealers or other financial intermediaries may send you confirmations of your transactions and periodic account statements showing your investments in the Fund.

Share Price.    The Fund sells its shares based on the NAV next determined after the time as of which the Fund receives your completed subscription order form but does not issue the shares to you until it receives full payment, subject to a front-end sales charge in the case of Class A shares. See “Pricing of Fund Shares” herein for a description of the calculation of the NAV, as described under “Classes of Shares — Sales Charge — Class A Shares.”

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Minimum Investments.    The minimum initial investment for Class AAA, Class A, and Class C shares is $1,000 ($250 for IRAs or Coverdell Education Savings Plans). The minimum initial investment for Class I shares is $500,000 for investors purchasing Class I shares directly through the Distributor. Investors who wish to purchase Class I shares through brokers or financial intermediaries that have entered into selling agreements with the Distributor specifically with respect to Class I shares should consult their broker or financial intermediary with respect to any minimum investment amount required for their account. The Distributor or its affiliates may, in their discretion, waive the minimum investment requirement under certain circumstances. There is no minimum for subsequent investments. Broker-dealers and financial intermediaries may have different minimum investment requirements.

General.    DST will not issue share certificates unless you request them. The Fund reserves the right to (i) reject any purchase order if, in the opinion of the Fund’s management, it is in the Fund’s best interest to do so, (ii) suspend the offering of shares for any period of time, and (iii) waive the Fund’s minimum purchase requirements. Except for differences attributable to these arrangements, the shares of all classes are substantially the same.

Customer Identification Program.    Federal law requires the Fund to obtain, verify, and record identifying information, which may include the name, residential or business address, date of birth (for an individual), social security or taxpayer identification number, or other identifying information, for each investor who opens or reopens an account with the Fund. Applications without the required information may be rejected or placed on hold until the Fund verifies the account holder’s identity.

Third Party Arrangements.    In addition to, or in lieu of amounts received by broker-dealers or other financial intermediaries as reallowances of a portion of sales commissions, the Adviser and its affiliates may utilize a portion of their assets, which may include revenues received under the Plans, to pay all or a portion of the charges of various programs that make shares of the Fund available to their customers. These payments, sometimes referred to as “revenue sharing,” do not change the price paid by investors to purchase the Fund’s shares or the amount the Fund receives as proceeds from such sales. Revenue sharing payments may be made to broker-dealers and other financial intermediaries that provide services to the Fund or to shareholders in the Fund, including (without limitation) the following programs: shareholder servicing to Fund shareholders, transaction processing, sub-accounting services, marketing support, access to sales meetings, sales representatives, and management representatives of the broker-dealer or other financial intermediaries. Revenue sharing payments may also be made to broker-dealers and other financial intermediaries for inclusion of the Fund on a sales list, including a preferred or select sales list, and in other sales programs. These payments take a variety of forms, including (without limitation) compensation for sales, “trail” fees for shareholder servicing and maintenance of shareholder accounts, and finders’ fees that vary depending on the share class and the dollar amount of shares sold. Revenue sharing payments may be structured: (i) as a percentage of sales; (ii) as a percentage of net assets; and/or (iii) as a fixed dollar amount.

The Adviser may also provide non-cash compensation to broker-dealers or other financial intermediaries in accordance with applicable rules of the Financial Industry Regulatory Authority, Inc. (“FINRA”), such as the reimbursement of travel, lodging, and meal expenses incurred in connection with attendance at educational and due diligence meetings or seminars by qualified registered representatives of those firms and, in certain cases, their families; meeting fees; certain entertainment; advertising or other promotional expenses; or other permitted expenses as determined in accordance with applicable FINRA rules. In certain cases these other payments could be significant.

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Subject to tax limitations and approval by the Board, the Fund may also make payments to third parties out of its own assets (other than Rule 12b-1 payments) for a portion of the charges for those programs that generally represent savings of expenses experienced by the Fund resulting from shareholders investing in the Fund through such programs rather than investing directly in the Fund.

The Adviser negotiates the level of payments described above to any particular broker-dealer or other financial intermediary. Currently, such payments (expressed as a percentage of net assets) range from 0.10% to 0.40% per year of the average daily net assets of the Fund attributable to the particular firm depending on the nature and level of services and other factors. In the case of Class I shares, the Fund may not make any payments for distribution related services.

In addition, in certain cases, broker-dealers or other financial intermediaries, may have agreements pursuant to which shares of the Fund owned by their clients are held of record on the books of the Fund in omnibus accounts maintained by each intermediary, and the intermediaries provide those Fund shareholders with sub-administration and sub-transfer agency services. Pursuant to the Fund’s transfer agency agreement, the Fund pays the transfer agent a fee for each shareholder account. As a result, the use of one omnibus account for multiple beneficial shareholders can create a cost savings to the Fund. The Board may, from time to time, authorize the Fund to pay for a portion of the fees charged by these intermediaries if (i) a cost savings to the Fund can be demonstrated and (ii) the omnibus account of the intermediary has net assets in the Fund in excess of $10 million. In these cases, the Board may authorize the Fund to pay a portion of the fees to the intermediary in an amount no greater than the lower of the transfer agency cost savings relating to the particular omnibus account or 0.10% of the average daily net assets of that omnibus account. These payments compensate these intermediaries for the provision of sub-administration and sub-transfer agency services associated with their clients whose shares are held of record in this manner.

Additional Purchase Information

Retirement Plans/Education Savings Plans.    The Fund makes available IRAs and Coverdell Education Savings Plans for investment in Fund shares. Applications may be obtained from the Distributor by calling 800-GABELLI (800-422-3554). Self-employed investors may purchase shares of the Fund through tax-deductible contributions to existing retirement plans for self-employed persons, known as “Keogh” or “H.R.-10” plans. The Fund does not currently act as a sponsor to such plans. Fund shares may also be a suitable investment for other types of qualified pension or profit sharing plans which are employer sponsored, including deferred compensation or salary reduction plans known as “401(k) Plans.” For Class AAA, A, and C shares, the minimum initial investment in all such retirement and education savings plans is $250. There is no minimum subsequent investment for retirement or education savings plans.

Automatic Investment Plan.    The Fund offers an automatic monthly investment plan. For Class AAA, A, and C shares, there is no minimum initial investment for accounts establishing an automatic investment plan. Call your financial intermediary or the Distributor at 800-GABELLI (800-422-3554) for more details about the plan.

Telephone or Internet Investment Plan.    You may purchase additional shares of the Fund by telephone and/or over the Internet if your bank is a member of the ACH system. You must have a completed and approved Account Options Form on file with the Transfer Agent. There is a minimum of

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$100 for each telephone or Internet investment. However, you may split the $100 minimum between two funds. To initiate an ACH purchase, please call your financial intermediary or 800-GABELLI (800-422-3554) or 800-872-5365 or visit our website at www.gabelli.com.

Voluntary Conversion.    Shareholders may be able to convert shares to Class I shares of the Fund, which have a lower expense ratio, provided certain conditions are met. For Class A and Class C shares, this conversion feature is intended for shares held through a financial intermediary offering a fee-based or wrap fee program that has an agreement with the Adviser or the Distributor specific for this purpose. Shareholders who currently hold Class AAA shares and are eligible to purchase Class I shares may convert existing Class AAA shares of the same Fund through their financial intermediary if their financial intermediary has a specific agreement with the Distributor. In such instances, Class AAA, Class A, and Class C shares may be converted under certain circumstances. Generally, Class C shares are not eligible for conversion until the applicable CDSC period has expired. Under current interpretation of applicable federal income tax law by the Internal Revenue Service, voluntary conversions to a different class of shares generally should not be treated as a taxable event. Please contact your financial intermediary for additional information. Not all share classes are available through all financial intermediaries.

If shares of the Fund are converted to a different share class of the Fund, the transaction will be based on the respective NAV of each class as of the trade date of the conversion. Consequently, a shareholder may receive fewer shares or more shares than originally owned, depending on that day’s NAVs. Please contact your tax adviser regarding the tax consequences of any conversion.

Conversion of Class C shares to Class A shares.    Investors whose accounts are held at the Fund’s transfer agent are eligible to hold Class C shares of the Fund only until the month of the 10-year anniversary of the purchase date. In the month of the 10-year anniversary of the purchase date, the Fund will convert such an investor’s Class C shares into Class A shares. This conversion will not be subject to any sales charge, fee, or other charge, and will be based on the relative net asset values of the two classes in question. The Internal Revenue Service currently takes the position that such conversions are not taxable. Should its position change, the conversion feature may be suspended. If this were to happen, you would have the option of instructing the Fund to continue to convert your Class C shares of the Fund to Class A shares of the Fund at the anniversary date described above. This conversion would also be based on the relative net asset values of the two classes in question, without the imposition of a sales charge or fee, but you might face certain tax consequences as a result. Shareholders should consult with their tax advisor regarding the state and local tax consequences of such conversions.

Investors holding Class C shares of the Fund through a financial intermediary in “street name” may be subject to different eligibility requirements regarding the holding of Class C shares of the Fund. In this regard, a financial intermediary may sponsor and/or control accounts, programs or platforms that impose a different conversion schedule or different eligibility requirements for the conversion of Class C shares into Class A shares. In these cases, Class C shares of the Fund may be converted to Class A shares under the policies of the financial intermediary and the conversion may be structured as an exchange of Class C shares for Class A shares of the Fund. Financial intermediaries will be responsible for making such exchanges in those circumstances. Please consult with your financial intermediary if you have any questions regarding your shares’ conversion from Class C shares to Class A shares. To the extent a financial intermediary’s policies provide for no such conversion, or for a conversion schedule that extends beyond the month of the 10-year anniversary of the purchase date, investors holding Class C shares

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through such financial intermediary may be disadvantaged relative to investors holding Class C shares either at the Fund’s transfer agent or through another financial intermediary. Because Class C shares pay higher ongoing asset-based distribution and shareholder servicing fees than Class A shares, financial intermediaries may have a conflict of interest in establishing their relevant conversion schedules and eligibility requirements. Additional information can be found in Appendix A, “Sales Charge Reductions and Waivers Available Through Certain Intermediaries,” attached to the Fund’s Prospectus.

REDEMPTION OF SHARES

You can redeem shares of the Fund on any Business Day. The Fund may temporarily stop redeeming its shares beyond seven (7) days when the NYSE is closed, when trading on the NYSE is restricted (as determined by the SEC), or when an emergency exists (as determined by the SEC), and the Fund cannot sell its portfolio securities or accurately determine the value of its assets, or if the SEC orders the Fund to suspend redemptions.

The Fund redeems its shares based on the NAV per share next determined after the time as of which the Fund or, if applicable, its authorized designee, receives your redemption request in proper form, subject in some cases to a redemption fee or a CDSC, as described under “Classes of Shares — Contingent Deferred Sales Charges” or a redemption fee as described below in this section. See “Pricing of Fund Shares” herein for a description of the calculation of NAV. A redemption is a taxable event to you on which you would realize gain or loss (subject to certain limitations on the deductibility of losses). In instances where a redemption fee is triggered, a CDSC may also apply, as described in greater detail in other parts of this prospectus.

You may redeem shares through a broker-dealer or other financial intermediary that has entered into a selling agreement with the Distributor. The broker-dealer or other financial intermediary will transmit a redemption order to DST on your behalf. The redemption request will be effected at the NAV next determined (less any applicable CDSC) after the Fund or, if applicable, its authorized designee, receives the request in proper form. If you hold share certificates, you must present the certificates endorsed for transfer.

The Fund is intended for long term investors and not for those who wish to trade frequently in Fund shares. The Fund believes that excessive short term trading of Fund shares creates risks for the Fund and its long term shareholders, including interference with efficient portfolio management, increased administrative and brokerage costs, and potential dilution in the value of Fund shares.

In addition, because the Fund may invest in foreign securities traded primarily on markets that close prior to the time the Fund determines its NAV, frequent trading by some shareholders may, in certain circumstances, dilute the value of Fund shares held by other shareholders. This may occur when an event that affects the value of the foreign securities takes place after the close of the primary foreign market, but before the time that the Fund determines its NAV. Certain investors may seek to take advantage of the fact that there will be a delay in the adjustment of the market price for a security caused by this event until the

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foreign market reopens (referred to as price arbitrage). If this occurs, frequent traders who attempt this type of price arbitrage may dilute the value of the Fund’s shares to the extent they receive shares or proceeds based upon NAVs that have been calculated using the closing market prices for foreign securities, if those prices have not been adjusted to reflect a change in the fair value of the foreign securities. In an effort to prevent price arbitrage, the Fund has procedures designed to adjust closing market prices of foreign securities before it calculates its NAV when it believes such an event has occurred that will have more than a minimal effect on the NAV. Prices are adjusted to reflect what the Fund believes are the fair values of these foreign securities at the time the Fund determines its NAV (called fair value pricing). Fair value pricing, however, involves judgments that are inherently subjective and inexact since it is not always possible to be sure when an event will affect a market price and to what extent. As a result, there can be no assurance that fair value pricing will always eliminate the risk of price arbitrage.

In order to discourage frequent short term trading in Fund shares, the Fund has adopted policies and procedures that impose a 2.00% redemption fee (short term trading fee) on Class AAA, Class A, Class C, and Class I shares that are redeemed or exchanged within seven days of a purchase. This fee is calculated based on the shares’ aggregate NAV on the date of redemption and deducted from the redemption proceeds. The redemption fee is not a sales charge; it is retained by the Fund and does not benefit the Fund’s Adviser, the Distributor, or any third party. For purposes of computing the redemption fee, shares will be redeemed in reverse order of purchase (the latest shares acquired will be treated as being redeemed first). Redemptions to which the fee applies include redemption of shares resulting from an exchange made pursuant to the Fund’s exchange privilege. The redemption fee will not apply to redemptions of shares where (i) the shares were purchased through automatic reinvestment of dividends or other distributions, (ii) the redemption is initiated by the Fund, (iii) the shares were purchased through programs that collect the redemption fees at the program level and remit them to the Fund, or (iv) the shares were purchased through programs that the Adviser determines to have appropriate anti-short term trading policies in place or as to which the Adviser has received assurances that look through redemption fee procedures or effective anti-short term trading policies and procedures are in place.

While the Fund has entered into information sharing agreements with financial intermediaries which contractually require such financial intermediaries to provide the Fund with information relating to their customers investing in the Fund through non-disclosed or omnibus accounts, the Fund cannot guarantee the accuracy of the information provided to it from financial intermediaries and may not always be able to track short term trading effected through these financial intermediaries. In addition, because the Fund is required to rely on information provided by the financial intermediary as to the applicable redemption fee, the Fund cannot guarantee that the financial intermediary is always imposing such fee on the underlying shareholder in accordance with the Fund’s policies. Subject to the exclusions discussed above, the Fund seeks to apply these policies uniformly.

Certain financial intermediaries may have procedures which differ from those of the Fund to collect the redemption fees or that prevent or restrict frequent trading. Investors should refer to their intermediary’s policies on frequent trading restrictions.

The Fund continues to reserve all rights, including the right to refuse any purchase request (including requests to purchase by exchange) from any person or group who, in the Fund’s view, is likely to engage in excessive trading or if such purchase is not in the best interest of the Fund and to limit, delay, or impose other conditions on exchanges or purchases. The Fund has adopted a policy of seeking to

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minimize short term trading in its shares and monitors purchase and redemption activities to assist in minimizing short term trading.

If you hold shares directly through the Distributor, you may redeem shares:

If you redeem shares through your broker or other financial intermediary, the broker or financial intermediary will transmit a redemption order to DST on your behalf. The redemption request will be effected at the NAV per share next determined (less any applicable CDSC and redemption fee, if applicable) after a Fund receives the request in proper form. If you hold share certificates, you must present the certificates endorsed for transfer.

Automatic Cash Withdrawal Plan.    You may automatically redeem shares on a monthly, quarterly, or annual basis if you have at least $10,000 in your account and if your account is directly registered with DST. Please call 800-GABELLI (800-422-3554) for more information about this plan.

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Involuntary Redemption.    The Fund may redeem all shares in your account (other than an IRA or Coverdell education savings account) if the value falls below $1,000 as a result of redemptions (but not as a result of a decline in NAV). You will be notified in writing before the Fund initiates such action and you will be allowed thirty days to increase the value of your account to at least $1,000.

Reinstatement Privilege.    A shareholder in the Fund who has redeemed Class A shares may reinvest, without a sales charge, up to the full amount of such redemption at the NAV determined at the time of the reinvestment within ninety days of the original redemption. A redemption is a taxable transaction and a gain or loss may be recognized for federal income tax purposes even if the reinstatement privilege is exercised. However, any loss realized upon the redemption will not be recognized as to the number of shares acquired by reinstatement within thirty days of the redemption, in which case an adjustment will be made to the tax basis of the shares so acquired.

Redemption Proceeds.    The Fund expects to meet redemption requests typically by selling portfolio assets, with holdings of cash and cash equivalents, or by drawing on its line of credit. In certain circumstances, the Fund may meet a redemption request in-kind, as described under “Redemption In Kind.” These methods of meeting redemption requests are expected to be used in both normal and stressed market conditions. A redemption request received by the Fund will be effected based on the NAV per share next determined after the time as of which the Fund or, if applicable, its authorized designee, receives the request. If you request redemption proceeds by wire, the Fund will normally wire the funds according to the wire instructions you provide, within three business days after receipt of your redemption request. If you request redemption proceeds by check, the Fund will normally mail the check to you within seven days after receipt of your redemption request. If you purchased your Fund shares by check or through the Automatic Investment Plan you may not receive proceeds from your redemption until the check clears or ten days following the purchase, whichever is earlier. While the Fund will delay the processing of the redemption payment until the check clears, your shares will be valued at the next determined NAV after receipt of your redemption request. Typically, the Fund receives redemption requests through the National Securities Clearing Corporation (“NSCC”) system, which is utilized by financial intermediaries to submit requests on behalf of their clients or customers who hold shares of the Fund in “street name.” In such circumstances, the Fund expects redemption proceeds to be delivered via the NSCC system within three business days after receipt of a redemption request. The NSCC system is not used for shareholders whose accounts are held at the Fund’s transfer agent (as opposed to shareholders whose accounts are held in “street name” at a broker or other financial intermediary).

Redemption In Kind.    The Fund may pay your redemption proceeds wholly or partially in portfolio securities. Specifically, the Fund may pay your redemption proceeds in portfolio securities if you redeem more than $250,000 over the preceding three months, and the Adviser believes that economic conditions exist which would make payments in cash detrimental to the best interests of the Fund. In such an instance, the Fund would communicate to you its intention to meet your redemption request in portfolio securities. Securities received in kind will remain subject to the risk of market fluctuations until sold; however, the Fund would distribute to you from its portfolio of investments only securities that the Adviser determines are readily marketable. The specific security or securities to be distributed will be selected at the discretion of the Board or its designee(s), subject to any applicable laws or regulations, and could be individual securities, a representative basket of securities or a pro-rata slice of the Fund’s portfolio. Any additional remainder in value owed to you between such securities and Fund shares that you submitted for redemption would be paid to you in cash. Payments would be made in portfolio securities only in

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instances where the Fund’s Board (or its delegate) believes that it would be in the Fund’s best interest not to pay the redemption proceeds in cash. A redemption in kind would be a taxable event to you on which you would realize a capital gain or capital loss on your shares redeemed. Additionally, you may incur brokerage costs in converting any of the securities received to cash. The foregoing considerations apply in both normal and stressed market considerations. Please see “Redemption of Shares” in the SAI for additional information.

EXCHANGE OF SHARES

You can exchange shares of the Fund for shares of the same class of certain other funds managed by the Adviser or its affiliates based on their relative NAVs at the time of exchange. To obtain a list of the funds whose shares you may acquire through an exchange, call 800-GABELLI (800-422-3554) or contact your broker. Class C shares will continue to age from the date of the original purchase of such shares and will assume the CDSC rate such shares had at the time of exchange. You may also exchange your shares for shares of the same class of a money market fund managed by the Adviser or its affiliates, without imposition of any CDSC at the time of exchange. Upon subsequent redemption from such money market fund or the Fund (after re-exchange into the Fund), such shares will be subject to the CDSC calculated by excluding the time such shares were held in a Gabelli money market fund. The Fund may impose limitations on, or terminate, the exchange privilege with respect to any investor at any time. You will be given notice at least sixty days prior to any material change in the exchange privilege. An exchange of shares is a taxable event to you on which you would realize a capital gain or capital loss (subject to possible limitations of deductibility).

In effecting an exchange:

You may exchange shares through the Distributor, directly through the Transfer Agent, or through a financial intermediary that has entered into the appropriate selling agreement with the Distributor.

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Your financial intermediary may charge you a processing fee for assisting you in purchasing or redeeming shares of the Fund. This charge is set by your financial intermediary and does not benefit the Fund, the Distributor, or the Adviser in any way. It would be in addition to the sales charges and other costs, if any, described in this prospectus and must be disclosed to you by your broker-dealer or other financial intermediary.