Management

Manager and subadviser

Legg Mason Partners Fund Advisor, LLC (“LMPFA” or the “manager”) is the fund’s investment manager. LMPFA, with offices at 620 Eighth Avenue, 49th Floor, New York, New York 10018, is a recently-organized investment adviser that has been formed to serve as the investment manager of the fund and other Legg Mason-sponsored funds. LMPFA provides administrative and certain oversight services to the fund and manages the fund’s cash and short-term instruments. As of September 30, 2007, LMPFA’s total assets under management were approximately $190 billion. ClearBridge Advisors, LLC (“ClearBridge” or the “subadviser”) provides the day-to-day portfolio management of the fund, except for the management of cash and short-term instruments, as subadviser.

ClearBridge has offices at 620 Eighth Avenue, 48th Floor, New York, New York 10018 and is a recently-organized investment adviser that has been formed to succeed to the equity securities portfolio management business of Citigroup Asset Management (“CAM”), which was acquired by Legg Mason, Inc. (“Legg Mason”) in December 2005. As of September 30, 2007, ClearBridge’s total assets under management were approximately $107.6 billion.

LMPFA and ClearBridge are wholly-owned subsidiaries of Legg Mason. Legg Mason, whose principal executive offices are at 100 Light Street, Baltimore, Maryland 21202, is a global asset management company. As of September 30, 2007, Legg Mason’s asset management operation had aggregate assets under management of approximately $992 billion.

Prior to August 1, 2006, Smith Barney Fund Management LLC (“SBFM”) was the fund’s investment manager. SBFM is also a wholly-owned subsidiary of Legg Mason.

Portfolio manager

The fund is managed by Peter Luke who is supported by a team of highly qualified investment professionals. Mr. Luke has been responsible for the fund’s day-to-day management and oversight since 2001. Prior to 2001, Mr. Luke was employed as a portfolio manager by General Motors Investment Management Corporation. Mr. Luke is an investment officer of ClearBridge with over 34 years of investment management experience.

The SAI provides information about the compensation of the portfolio manager, other accounts managed by the portfolio manager and any fund shares held by the portfolio manager.

Management fee

For the fiscal year ended July 31, 2007, the fund paid a fee, after waivers and reimbursements, of 0.54% of the fund’s average daily net assets for management services.

A discussion regarding the basis for the Board’s approval of the fund’s management agreement and subadvisory agreement is available in the fund’s Annual Report for the fiscal year ended July 31, 2006.

Distribution plan

Legg Mason Investor Services, LLC (“LMIS”), a wholly-owned broker/dealer subsidiary of Legg Mason, and Citigroup Global Markets Inc. (“CGMI”) serve as the fund’s distributors.

8         Legg Mason Partners Funds

The fund has adopted a shareholder services and distribution plan for each of its Class A, B and C shares. Under the plan, the fund pays distribution and/or service fees. The plan provides for payments, based on annualized percentages of average daily net assets, of up to 0.25% for Class A shares; up to 0.75% for Class B shares; and up to 1.00% for Class C shares. These fees are an ongoing expense and, over time, will increase the cost of your investment and may cost you more than other types of sales charges.

In addition, the distributors may make payments for distribution and/or shareholder servicing activities out of their past profits and other available sources. A distributor may also make payments to dealers for marketing, promotional or related expenses. The amount of these payments is determined by the distributors and may be substantial. The manager or an affiliate may make similar payments under similar arrangements.

The payments described in the paragraph above are often referred to as “revenue sharing payments.” The recipients of such payments may include the fund’s distributors, affiliates of the manager, broker/dealers, financial institutions and other financial intermediaries through which investors may purchase shares of the fund. In some circumstances, such payments may create an incentive for an intermediary or its employees or associated persons to recommend or sell shares of the fund to you. Please contact your financial intermediary for details about revenue sharing payments it may receive.

Recent developments

On May 31, 2005, the SEC issued an order in connection with the settlement of an administrative proceeding against SBFM, the then-investment adviser or manager to the fund, and CGMI, relating to the appointment of an affiliated transfer agent for the Smith Barney family of mutual funds, including the fund (the “Affected Funds”).

The SEC order found that SBFM and CGMI willfully violated Section 206(1) of the Investment Advisers Act of 1940, as amended, and the rules promulgated thereunder (the “Advisers Act”). Specifically, the order found that SBFM and CGMI knowingly or recklessly failed to disclose to the boards of the Affected Funds in 1999 when proposing a new transfer agent arrangement with an affiliated transfer agent that: First Data Investors Services Group (“First Data”), the Affected Funds’ then-existing transfer agent, had offered to continue as transfer agent and do the same work for substantially less money than before; and that CAM, the Citigroup business unit that, at the time, included the Affected Funds’ investment manager and other investment advisory companies, had entered into a side letter with First Data under which CAM agreed to recommend the appointment of First Data as sub-transfer agent to the affiliated transfer agent in exchange for, among other things, a guarantee by First Data of specified amounts of asset management and investment banking fees to CAM and CGMI. The order also found that SBFM and CGMI willfully violated Section 206(2) of the Advisers Act by virtue of the omissions discussed above and other misrepresentations and omissions in the materials provided to the Affected Funds’ boards, including the failure to make clear that the affiliated transfer agent would earn a high profit for performing limited functions while First Data continued to perform almost all of the transfer agent functions, and the suggestion that the proposed arrangement was in the Affected Funds’ best interests and that no viable alternatives existed.

SBFM and CGMI do not admit or deny any wrongdoing or liability. The settlement does not establish wrongdoing or liability for purposes of any other proceeding. The SEC

Legg Mason Partners Convertible Fund         9

censured SBFM and CGMI and ordered them to cease and desist from violations of Sections 206(1) and 206(2) of the Advisers Act. The order required Citigroup to pay $208.1 million, including $109 million in disgorgement of profits, $19.1 million in interest, and a civil money penalty of $80 million. Approximately $24.4 million has already been paid to the Affected Funds, primarily through fee waivers. The remaining $183.7 million, including the penalty, has been paid to the U.S. Treasury and will be distributed pursuant to a plan submitted for the approval of the SEC. At this time, there is no certainty as to how the above-described proceeds of the settlement will be distributed, to whom such distributions will be made, the methodology by which such distributions will be allocated, and when such distributions will be made. The order also required that transfer agency fees received from the Affected Funds since December 1, 2004, less certain expenses, be placed in escrow and provided that a portion of such fees might be subsequently distributed in accordance with the terms of the order. On April 3, 2006, an aggregate amount of approximately $9 million held in escrow was distributed to the Affected Funds.

The order required SBFM to recommend a new transfer agent contract to the Affected Funds’ boards within 180 days of the entry of the order; if a Citigroup affiliate submitted a proposal to serve as transfer agent or sub-transfer agent, SBFM and CGMI would have been required, at their expense, to engage an independent monitor to oversee a competitive bidding process. On November 21, 2005, and within the specified timeframe, the Affected Funds’ Boards selected a new transfer agent for the Affected Funds. No Citigroup affiliate submitted a proposal to serve as transfer agent. Under the order, SBFM also must comply with an amended version of a vendor policy that Citigroup instituted in August 2004.

Although there can be no assurance, the manager does not believe that this matter will have a material adverse effect on the Affected Funds.

On December 1, 2005, Citigroup completed the sale of substantially all of its global asset management business, including SBFM, to Legg Mason.

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Choosing a class of shares to buy

Individual investors can generally choose among three classes of shares: Class A ⁽¹⁾ , B and C shares. Individual investors that held Class I (formerly Class Y) shares prior to November 20, 2006, may continue to invest in Class I shares. Institutional and retirement plan investors and clients of financial intermediaries should refer to “Retirement and institutional investors” below for a description of the classes available to them. Each class has different sales charges and expenses, allowing you to choose the class that best meets your needs.

When choosing which class of shares to buy, you should consider:

If you are choosing between Class A and Class B shares, it will in almost all cases be the more economical choice for you to purchase Class A shares if you plan to purchase shares in an amount of $100,000 or more (whether in a single purchase or through aggregation of eligible holdings). This is because of the reduced sales charge available on larger investments of Class A shares and the lower ongoing expenses of Class A shares compared to Class B shares.

If you intend to invest for only a few years, the effect of Class B contingent deferred sales charges on redemptions made within five years of purchase, as well as the effect of higher expenses of that class, might make an investment in Class C shares more appropriate. There is no initial sales charge on Class C shares, and the contingent deferred sales charge does not apply to shares redeemed one year or more after purchase.

However, if you plan to invest a large amount and your investment horizon is five years or more, Class C shares might not be as advantageous as Class A shares. The annual distribution and service fees on Class C shares may cost you more over the longer term than the front-end sales charge you would have paid for larger purchases of Class A shares.

You may buy shares from:

Different types of shareholder services may be available to you under arrangements offered by different Service Agents. In addition, these services may vary depending on the share class in which you choose to invest. In making your decision regarding which share class to buy, please keep in mind that your Service Agent may receive different compensation depending on the share class in which you invest. Investors should consult with their Service Agent about comparative pricing of shareholder services available to them under each available share class, the compensation that will be received by their Service Agent in connection with each available share class, and other factors that may be relevant to the investor’s choice of share class in which to invest.

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Not all Classes of shares are available through each Service Agent. You should contact your Service Agent for further information about available share classes.

Investment minimums

Minimum initial and additional investment amounts vary depending on the class of shares you buy and the nature of your investment.

More information about the fund’s classes of shares is available through the Legg Mason Partners Funds’ website. You’ll find detailed information about sales charges and ways you can qualify for reduced or waived sales charges, including:

To access the website, go to http://www.leggmason.com/InvestorServices and click on the name of the fund.

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Comparing the fund’s classes

The following table compares key features of the fund’s classes. You should review the Fee table and Example at the front of this Prospectus carefully before choosing your share class. Your Service Agent can help you decide which class meets your goals. Your Service Agent may receive different compensation depending upon which class you choose.

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Sales charges

Class A shares

You buy Class A shares at the offering price, which is the net asset value plus a sales charge. You pay a lower rate as the size of your investment increases to certain levels called breakpoints. You do not pay a sales charge on the fund’s distributions or dividends you reinvest in additional Class A shares.

The table below shows the rate of sales charge you pay, depending on the amount you purchase. The table below also shows the amount of broker/dealer compensation that will be paid out of the sales charge if you buy shares from a Service Agent. For Class A shares sold directly by LMIS, LMIS will receive the sales charge imposed on purchases of Class A shares (or any contingent deferred sales charge paid on redemptions) and will retain the full amount of such sales charge. For Class A shares sold by CGMI, CGMI will receive the sales charge imposed on purchases of Class A shares and will retain an amount equal to the broker/dealer commission paid out of the sales charge. LMIS will receive any portion not retained by CGMI. Service Agents (including CGMI) will also receive a service fee payable on Class A shares at an annual rate of up to 0.25% of the average daily net assets represented by the Class A shares serviced by them.

Investments of $1,000,000 or more

You do not pay an initial sales charge when you buy $1,000,000 or more of Class A shares. However, if you redeem these Class A shares within one year of purchase, you will pay a contingent deferred sales charge of 1.00%.

Qualifying for a reduced Class A sales charge

There are several ways you can combine multiple purchases of Class A shares of Legg Mason Partners Funds to take advantage of the breakpoints in the sales charge schedule. In order to take advantage of reductions in sales charges that may be available to

14         Legg Mason Partners Funds

you when you purchase fund shares, you must inform your Service Agent or Legg Mason Partners Shareholder Services if you are eligible for a letter of intent or a right of accumulation and if you own shares of other Legg Mason Partners Funds that are eligible to be aggregated with your purchases. Certain records, such as account statements, may be necessary in order to verify your eligibility for reduced sales charges.

with the dollar amount of your next purchase of Class A shares for purposes of calculating the initial sales charge.

Shares of certain money market funds advised by the manager or its affiliates (other than money market fund shares acquired by exchange from other Legg Mason Partners Funds offered with a sales charge), Legg Mason Partners S&P 500 Index Fund and Class O shares of Legg Mason Partners Equity Fund may not be combined.

If you hold shares of Legg Mason Partners Funds in accounts at two or more Service Agents, please contact your Service Agents to determine which shares may be combined.

Certain trustees and fiduciaries may be entitled to combine accounts in determining their sales charge.

are eligible for inclusion under the letter, based on the public offering price at the time of the purchase, and any capital appreciation on those shares. Purchases made 90 days prior to the 13-month period are also eligible to be treated as purchases made under the letter of intent. In addition, you can include towards your asset goal amount the current value of any eligible purchases that were made prior to the date of entering into the letter of intent and are still held.

Shares of certain money market funds advised by the manager or its affiliates (other than money market fund shares acquired by exchange from other Legg Mason Partners Funds offered with a sales charge), Legg Mason Partners S&P 500 Index Fund and Class O shares of Legg Mason Partners Equity Fund may not be credited toward your letter of intent asset goal.

If you hold shares of Legg Mason Partners Funds in accounts at two or more Service Agents, please contact your Service Agents to determine which shares may be credited toward your letter of intent asset goal.

If you do not meet your asset goal amount, shares in the amount of any sales charges due based on the amount of your actual purchases will be redeemed from your account.

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Waivers for certain Class A investors

Class A initial sales charges are waived for certain types of investors, including:

If you qualify for a waiver of the Class A initial sales charge, you must notify your Service Agent or the transfer agent at the time of purchase and provide sufficient information at the time of purchase to permit verification that the purchase qualifies for the initial sales charge waiver.

If you want to learn about additional waivers of Class A initial sales charges, contact your Service Agent, consult the SAI or access the Legg Mason Partners Funds’ website, http://www.leggmason.com/InvestorServices, and click on the name of the fund.

Class B shares

You buy Class B shares at net asset value without paying an initial sales charge. However, if you redeem your Class B shares within 5 years of your purchase payment, you will pay a contingent deferred sales charge. The contingent deferred sales charge decreases as the number of years since your purchase payment increases.

LMIS will generally pay Service Agents, including CGMI, selling Class B shares a commission of up to 4.00% of the purchase price of the Class B shares they sell, and LMIS will retain the contingent deferred sales charges. Service Agents also receive an annual distribution/service fee of up to 0.25% of the average daily net assets represented by the Class B shares serviced by them.

16         Legg Mason Partners Funds

Class B conversion

After approximately 8 years, Class B shares automatically convert into Class A shares. This helps you because Class A shares have lower annual expenses. Your Class B shares will convert to Class A shares as follows:

Class C shares

You buy Class C shares at net asset value without paying an initial sales charge. However, if you redeem your Class C shares within one year of purchase, you will pay a contingent deferred sales charge of 1.00%.

LMIS will generally pay Service Agents selling Class C shares a commission of up to 1.00% of the purchase price of the Class C shares they sell, and LMIS will retain the contingent deferred sales charges and an annual distribution/service fee of up to 1.00% of the average daily net assets represented by the Class C shares serviced by these Service Agents until the thirteenth month after purchase. Starting in the thirteenth month after purchase, these Service Agents will receive an annual distribution/service fee of up to 1.00% of the average daily net assets represented by the Class C shares serviced by them.

Class I shares (formerly Class Y shares)

Class I shares are purchased at net asset value with no initial sales charge and no contingent deferred sales charge when redeemed.

Legg Mason Partners Convertible Fund         17

More about contingent deferred sales charges

The contingent deferred sales charge is based on the net asset value at the time of purchase or redemption, whichever is less, and therefore you do not pay a sales charge on amounts representing appreciation or depreciation.

In addition, you do not pay a contingent deferred sales charge:

Each time you place a request to redeem shares, the fund will first redeem any shares in your account that are not subject to a contingent deferred sales charge and then the shares in your account that have been held the longest.

If you redeem shares of a Legg Mason Partners Fund and pay a contingent deferred sales charge, you may, under certain circumstances, reinvest all or part of the redemption proceeds within 60 days and receive pro rata credit for any contingent deferred sales charge imposed on the prior redemption. Please contact your Service Agent for additional information.

The fund’s distributors receive contingent deferred sales charges as partial compensation for their expenses in selling shares, including the payment of compensation to your Service Agent.

Contingent deferred sales charge waivers

The contingent deferred sales charge for each share class will generally be waived:

If you want to learn more about additional waivers of contingent deferred sales charges, contact your Service Agent, consult the SAI or access the Legg Mason Partners Funds’ website, http://www.leggmason.com/InvestorServices, and click on the name of the fund.

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Retirement and institutional investors

Eligible investors

Retirement Plans

Retirement Plans with omnibus accounts held on the books of the fund can generally choose among three classes of shares: Class C, Class A and Class I (formerly Class Y) shares.

“Retirement Plans” include 401(k) plans, 457 plans, employer-sponsored 403(b) plans, profit-sharing plans, non-qualified deferred compensation plans and other similar employer-sponsored retirement plans. Retirement Plans do not include individual retirement vehicles, such as traditional and Roth individual retirement accounts, Coverdell education savings accounts, individual 403(b)(7) custodial accounts, Keogh plans, SEPs, SARSEPs, SIMPLE IRAs, or Section 529 savings accounts. Although Retirement Plans with omnibus accounts held on the books of the fund are not subject to minimum initial investment requirements for any of these share classes, certain investment minimums may be imposed by a financial intermediary.

Other Retirement Plans

Other Retirement Plans can generally choose among three classes of shares: Class A, Class B and Class C. “Other Retirement Plans” include Retirement Plans investing through brokerage accounts, and also include certain Retirement Plans with direct relationships to the fund that are neither Institutional Investors nor investing through omnibus accounts. Individual retirement vehicles, such as IRAs, may also choose among these share classes. Other Retirement Plans and individual retirement vehicles are treated like individual investors for purposes of determining sales charges and any applicable sales charge reductions or waivers.

Clients of Eligible Financial Intermediaries

Clients of Eligible Financial Intermediaries may generally choose between two classes of shares: Class A and Class I. “Clients of Eligible Financial Intermediaries” are investors who invest in the fund through financial intermediaries that offer their clients fund shares through investment programs as authorized by LMIS. Such investment programs may include fee-based advisory account programs and college savings vehicles such as Section 529 plans. The financial intermediary may impose separate investment minimums.

Institutional Investors

Institutional Investors may invest in Class I shares if they meet the $1,000,000 minimum initial investment requirement. Institutional Investors may also invest in Class A, B and C shares, which have different investment minimums and fees and expenses. “Institutional Investors” generally include corporations, banks, insurance companies, foundations, retirement plans and other similar entities with direct relationships to the fund.

Class C — Retirement Plans

Retirement Plans with omnibus accounts held on the books of the fund may buy Class C shares without paying a contingent deferred sales charge. LMIS does not pay Service

Legg Mason Partners Convertible Fund         19

Agents selling Class C shares to retirement plans with omnibus accounts held on the books of a fund a commission on the purchase price of Class C shares sold by them. Instead, immediately after purchase, LMIS will pay these Service Agents an annual distribution/service fee of up to 1.00% of the average daily net assets represented by the Class C shares serviced by them.

Class A—Retirement Plans

Retirement Plans with omnibus accounts held on the books of the fund may purchase Class A shares through programs sponsored by financial intermediaries. Under these programs, the initial sales charge and contingent deferred sales charge for Class A shares are waived where:

LMIS does not pay Service Agents selling Class A shares to Retirement Plans with a direct omnibus relationship with the fund a commission on the purchase price of Class A shares sold by them. However, for certain Retirement Plans that are permitted to purchase shares at net asset value, LMIS may pay Service Agents commissions of up to 1.00% of the purchase price of the Class A shares that are purchased with regular ongoing plan contributions. Please contact your Service Agent for more information.

Class I shares

On November 20, 2006, Class Y shares were renamed Class I shares. Class I shares are offered only to Institutional Investors who meet the $1,000,000 minimum initial investment requirement, Clients of Eligible Financial Intermediaries, and other investors as authorized by LMIS. However, investors that held Class Y shares prior to that date will continue to be permitted to make additional investments in Class I shares.

Other considerations

Plan sponsors, plan fiduciaries and other financial intermediaries may choose to impose qualification requirements for plans that differ from the fund’s share class eligibility standards. In certain cases, this could result in the selection of a share class with higher service and distribution-related fees than otherwise would have been charged. The fund is not responsible for, and has no control over, the decision of any plan sponsor, plan fiduciary or financial intermediary to impose such differing requirements. Please consult with your plan sponsor, plan fiduciary or financial intermediary for more information about available share classes.

With respect to Class A and Class C shares, as applicable, the fund may pay a fee for recordkeeping services performed for the share class.

Not all share classes may be made available by your Service Agent. Please contact your Service Agent for additional details.

20         Legg Mason Partners Funds

Buying shares

The fund’s transfer agent or Legg Mason Partners Shareholder Services will employ reasonable procedures to confirm that any telephone exchange or redemption request is genuine, which may include recording calls, asking the caller to provide certain personal identification information, sending you a written confirmation or requiring other confirmation procedures from time to time. If these procedures are followed, neither the fund nor its agents will bear any liability for such transactions.

Signature guarantees

To be in good order, your redemption request must include a signature guarantee if you:

You can obtain a signature guarantee from most banks, dealers, brokers, credit unions and federal savings and loan institutions, but not from a notary public.

The fund has the right to:

Small account balances/Mandatory redemptions

If at any time the aggregate net asset value of the fund shares in your account is less than $500 for any reason (including solely due to declines in net asset value and/or failure to invest at least $500 within a reasonable period), the fund reserves the right to ask you to bring your account up to the applicable minimum investment amount as determined by

26         Legg Mason Partners Funds

your Service Agent. In such case, you shall be notified in writing and will have 60 days to make an additional investment to bring your account value up to the required level. If you choose not to do so within this 60-day period, the fund may close your account and send you the redemption proceeds. In the event your account is closed due to a failure to increase your balance to the minimum required amount, you will not be eligible to have your account subsequently reinstated without imposition of any sales charges that may apply to your new purchase. The fund may, with prior notice, change the minimum size of accounts subject to mandatory redemption, which may vary by class, or implement fees for small accounts.

Subject to applicable law, the fund may, with prior notice, adopt other policies from time to time requiring mandatory redemption of shares in certain circumstances.

For more information, please contact your Service Agent or Legg Mason Partners Shareholder Services or consult the SAI.

Frequent purchases and redemptions of fund shares

Frequent purchases and redemptions of fund shares may interfere with the efficient management of a fund’s portfolio by its portfolio manager, increase portfolio transaction costs, and have a negative effect on the fund’s long-term shareholders. For example, in order to handle large flows of cash into and out of the fund, the portfolio manager may need to allocate more assets to cash or other short-term investments or sell securities, rather than maintaining full investment in securities selected to achieve the fund’s investment objective. Frequent trading may cause the fund to sell securities at less favorable prices. Transaction costs, such as brokerage commissions and market spreads, can detract from the fund’s performance. In addition, the return received by long-term shareholders may be reduced when trades by other shareholders are made in an effort to take advantage of certain pricing discrepancies, when, for example, it is believed that the fund’s share price, which is determined at the close of the NYSE on each trading day, does not accurately reflect the value of the fund’s portfolio securities. Funds investing in foreign securities have been particularly susceptible to this form of arbitrage, but other funds could also be affected.

Because of the potential harm to funds in the Legg Mason Partners Funds complex and their long-term shareholders, the Board of the fund has approved policies and procedures that are intended to discourage and prevent excessive trading and market timing abuses through the use of various surveillance techniques. Under these policies and procedures, the fund may limit additional exchanges or purchases of fund shares by shareholders who are believed by the manager to be engaged in these abusive trading activities in the fund or in other funds within the fund complex. In the event that an exchange request is rejected, the shareholder may nonetheless redeem its shares. The intent of the policies and procedures is not to inhibit legitimate strategies, such as asset allocation, dollar cost averaging, or similar activities that may nonetheless result in frequent trading of fund shares.

Under the fund’s policies and procedures, the fund reserves the right to restrict or reject purchases of shares (including exchanges) without prior notice whenever a pattern of excessive trading by a shareholder is detected within the fund complex. A committee established by the manager administers the policy. The policy provides that the committee will use its best efforts to restrict a shareholder’s trading privileges in the Legg Mason Partners

Legg Mason Partners Convertible Fund         27

Funds if that shareholder has engaged in a total of four or more “Round Trips” across all Legg Mason Partners Funds during any rolling 12-month period. However, the committee has the discretion to determine that restricting a shareholder’s trading privileges is not necessary (or that a new limit on Round Trips should be established for the shareholder) if it is determined that the pattern of trading is not abusive or harmful. In making such a determination, the committee will consider, among other things, the nature of the shareholder’s account, the reason for the frequent trading, the amount of trading and the particular funds in which the trading has occurred. Additionally, the committee has the discretion to make inquiries or to take action against any shareholder whose trading appears inconsistent with the frequent trading policy. Examples of the types of actions the committee may take to deter excessive trading in a shareholder account include restricting the shareholder from purchasing additional shares in a fund altogether or imposing other restrictions (such as requiring purchase orders to be submitted by mail) that would deter the shareholder from trading frequently in the funds.

A “Round Trip” is defined as a purchase (including subscriptions and exchanges) into a fund followed by a sale (including redemptions and exchanges) of the same or a similar number of shares out of the fund within 30 days of such purchase. Purchases and sales of the fund’s shares pursuant to an automatic investment plan or similar program for periodic transactions are not considered in determining Round Trips. For purposes of these policies and procedures, the Legg Mason Partners Funds complex also includes certain Western Asset funds and Barrett Opportunity Fund, but does not include money market funds in the fund complex.

The policies apply to any account, whether an individual account, accounts with financial intermediaries such as investment advisers, broker/dealers or retirement plan administrators, commonly called omnibus accounts, where the intermediary holds fund shares for a number of its customers in one account. The fund’s ability to monitor trading in omnibus accounts may, however, be severely limited due to the lack of access to an individual investor’s trading activity when orders are placed through these types of accounts. There may also be operational and technological limitations on the ability of the fund’s service providers to identify or terminate frequent trading activity within the various types of omnibus accounts. The fund’s distributors have entered into agreements with intermediaries requiring the intermediaries to, among other things, help identify frequent trading activity and to prohibit further purchases or exchanges by a shareholder identified as having engaged in frequent trading. These agreements took effect on October 16, 2007.

The fund’s policies also require personnel such as portfolio managers and investment staff to report any abnormal or otherwise suspicious investment activity, and prohibits short-term trades by such personnel for their own account in mutual funds managed by the manager and its affiliates, other than money market funds. The fund has also adopted policies and procedures to prevent the selective release of information about the fund’s portfolio holdings, as such information may be used for market-timing and similar abusive practices.

The fund’s policies provide for ongoing assessment of the effectiveness of current policies and surveillance tools, and the Board reserves the right to modify these or adopt additional policies and restrictions in the future. Shareholders should be aware, however, that any surveillance techniques currently employed by the fund or other techniques that may

28         Legg Mason Partners Funds

be adopted in the future may not be effective, particularly where the trading takes place through certain types of omnibus accounts. As noted above, if the fund is unable to detect and deter trading abuses, the fund’s performance, and its long-term shareholders, may be harmed. In addition, shareholders may be harmed by the extra costs and portfolio management inefficiencies that result from frequent trading of fund shares, even when the trading is not for abusive purposes. Furthermore, the fund may not apply its policies consistently or uniformly, resulting in the risk that some shareholders may be able to engage in frequent trading while others will bear the costs and effects of that trading. The fund will provide advance notice to shareholders and prospective investors of any specific restrictions on the trading of fund shares that the Board may adopt in the future.

Share certificates

The fund does not issue share certificates. If you currently hold share certificates of the fund, such certificates will continue to be honored. If you would like to return your share certificates to the fund and hold your shares in uncertificated form, please contact your Service Agent or Legg Mason Partners Shareholder Services.

Record ownership

If you hold shares through a Service Agent, your Service Agent may establish and maintain your account and be the shareholder of record. In the event that the fund holds a shareholder meeting, your Service Agent, as record holder, will vote your shares in accordance with your instructions. If you do not give your Service Agent voting instructions, your Service Agent may nonetheless, under certain circumstances, be entitled to vote your shares.

Legg Mason Partners Convertible Fund         29

Dividends, distributions and taxes

Dividends and distributions

The fund generally pays dividends, if any, monthly, and makes capital gain distributions, if any, typically once or twice a year. The fund may pay additional distributions and dividends at other times if necessary for the fund to avoid a federal tax. The fund expects distributions to be from both income and capital gain. Capital gain distributions and dividends are reinvested in additional fund shares of the same class you hold. You do not pay a sales charge on reinvested distributions or dividends. Alternatively, you can instruct your Service Agent or Legg Mason Partners Shareholder Services to have your distributions and/or dividends paid in cash. You can change your choice at any time to be effective as of the next distribution or dividend.

Taxes

The following discussion is very general. Because each shareholder’s circumstances are different and special tax rules may apply, you should consult your tax adviser about your investment in the fund.

In general, you will have to pay federal income taxes, as well as any state and local taxes, when you redeem shares, exchange shares or receive a distribution (whether paid in cash or reinvested in additional shares). Any tax liability that you owe as a result of any of these taxable events is your responsibility. The federal income tax treatment of redemptions, exchanges and distributions is summarized in the following table:

Distributions of net capital gain are taxable to you as long-term capital gain regardless of how long you have owned your shares. Distributions of qualified dividend income received by a non-corporate shareholder may qualify for a reduced tax rate, provided that the shareholder satisfies certain holding period requirements. Qualified dividend income generally is income derived from dividends from a U.S. corporation; dividends from certain foreign corporations may also qualify. You may want to avoid buying shares when the fund is about to declare a capital gain distribution or a dividend, because it will be taxable to you even though it may effectively be a return of a portion of your investment.

After the end of each year, your Service Agent or the fund will provide you with information about the distributions and dividends you received and any redemptions of shares during the previous year. If you are neither a citizen nor a resident of the United States, the fund will withhold federal income tax at the rate of 30% (or such lower rate as may be determined in accordance with any applicable treaty) on ordinary dividends and

30         Legg Mason Partners Funds

other payments that are subject to such withholding. If you do not provide the fund with your correct taxpayer identification number and any required certifications, you will be subject to backup withholding at the rate of 28% on your distributions, dividends, and redemption proceeds. Backup withholding will not, however, be applied to payments that have been subject to the 30% withholding tax on shareholders who are neither citizens nor residents of the United States.

Legg Mason Partners Convertible Fund         31

Share price

You may buy, exchange or redeem shares at their net asset value next determined after receipt of your request in good order, plus any applicable sales charge. The fund’s net asset value per share is the value of its assets minus its liabilities divided by the number of shares outstanding. Net asset value is calculated separately for each class of shares. The fund calculates its net asset value every day the NYSE is open. This calculation is done when regular trading closes on the NYSE (normally 4:00 p.m., Eastern time). The NYSE is closed on certain holidays listed in the SAI.

The Board has approved procedures to be used to value the fund’s securities for the purposes of determining the fund’s net asset value. The valuation of the securities of the fund is determined in good faith by or under the direction of the Board. The Board has delegated certain valuation functions for the fund to the manager.

The fund generally values its securities based on market prices determined at the close of regular trading on the NYSE. The fund’s currency valuations, if any, are done as of when the London Stock Exchange closes, which is usually at 12 noon Eastern time, as the manager believes that these valuations typically reflect the largest trading volume in the foreign currency markets. A material change in the value of currency during the period between the close of the London Stock Exchange and the calculation of the fund’s net asset value on the same date is considered a significant event, as described below, in response to which the fund may use fair valuation procedures to value the affected investments. For equity securities that are traded on an exchange, the market price is usually the closing sale or official closing price on that exchange. In the case of securities not traded on an exchange, or if such closing prices are not otherwise available, the market price is typically determined by independent third party pricing vendors approved by the fund’s Board using a variety of pricing techniques and methodologies. The market price for debt obligations is generally the price supplied by an independent third party pricing service approved by the Board, which may use a matrix, formula or other objective method that takes into consideration market indices, yield curves and other specific adjustments. Short-term debt obligations that will mature in 60 days or less are valued at amortized cost, unless it is determined that using this method would not reflect an investment’s fair value. If vendors are unable to supply a price, or if the price supplied is deemed by the manager to be unreliable, the market price may be determined using quotations received from one or more broker/dealers that make a market in the security. When such prices or quotations are not available, or when the manager believes that they are unreliable, the manager may price securities using fair value procedures approved by the Board. Because the fund invests in securities rated below investment grade — some of which may be thinly traded, for which market quotations may not be readily available or may be unreliable — the fund may use fair valuation procedures more frequently than funds that invest primarily in securities that are more liquid, such as securities of large capitalization domestic issuers. The fund may also use fair value procedures if the manager determines that a significant event has occurred between the time at which a market price is determined and the time at which the fund’s net asset value is calculated. In particular, the value of foreign securities may be materially affected by events occurring after the close of the market on which they are valued, but before the fund prices its shares. The fund uses a fair value model

32         Legg Mason Partners Funds

developed by an independent third party pricing service to price foreign equity securities on days when there is a certain percentage change in the value of a domestic equity security index, as such percentage may be determined by LMPFA from time to time.

Valuing securities at fair value involves greater reliance on judgment than valuation of securities based on readily available market quotations. A fund that uses fair value to price securities may value those securities higher or lower than another fund using market quotations or its own fair value methodologies to price the same securities. There can be no assurance that the fund could obtain the fair value assigned to a security if it were to sell the security at approximately the time at which the fund determines its net asset value.

In order to buy, redeem or exchange shares at that day’s price, you must place your order with your Service Agent or the transfer agent before the NYSE closes. If the NYSE closes early, you must place your order prior to the actual closing time.

It is the responsibility of the Service Agents to transmit all orders to buy, exchange or redeem shares to the transfer agent on a timely basis.

Legg Mason Partners Convertible Fund         33

Financial highlights

The financial highlights tables are intended to help you understand the performance of each class for the past five years. Certain information reflects financial results for a single share. Total return represents the rate that a shareholder would have earned (or lost) on a fund share assuming reinvestment of all dividends and distributions. The information in the following tables has been derived from the fund’s and the predecessor fund’s financial statements. These financial statements have been audited by KPMG LLP, independent registered public accounting firm, whose report, along with the fund’s financial statements, is included in the annual report (available upon request). The financial information shown below for the periods prior to April 16, 2007 is that of the fund’s predecessor. As of April 29, 2004, Class L shares of the fund were renamed Class C shares. As of April 21, 2006, all Class O shares converted to Class A shares. As of November 20, 2006, Class Y shares were renamed Class I shares.

34         Legg Mason Partners Funds

36         Legg Mason Partners Funds

Legg Mason Partners Convertible Fund         37

(Investment Company Act file no. 811-6444)

FD04050 11/07

Legg Mason Partners Convertible Fund

You may visit the fund’s website at http://www.leggmason.com/InvestorServices for a free copy of a Prospectus, Statement of Additional Information (“SAI”) or an Annual or Semi-Annual Report, or to request other information.

Shareholder Reports Additional information about the fund’s investments is available in the fund’s Annual and Semi-Annual Reports to shareholders. In the fund’s Annual Report, you will find a discussion of the market conditions and investment strategies that significantly affected the fund’s performance.

The fund sends only one report to a household if more than one account has the same last name and same address. Contact your Service Agent or Legg Mason Partners Shareholder Services if you do not want this policy to apply to you.

Statement of additional information The SAI provides more detailed information about the fund and is incorporated by reference into (is legally a part of) this Prospectus.

You can make inquiries about the fund or obtain shareholder reports or the SAI (without charge) by contacting your Service Agent, by calling Legg Mason Partners Shareholder Services at 800-451-2010, or by writing to the fund at Legg Mason Partners Funds, 125 Broad Street, New York, New York 10004.

Information about the fund (including the SAI) can be reviewed and copied at the Securities and Exchange Commission’s (the “SEC”) Public Reference Room in Washington, D.C. Information on the operation of the Public Reference Room may be obtained by calling the SEC at 1-202-551-8090. Reports and other information about the fund are available on the EDGAR Database on the SEC’s Internet site at http://www.sec.gov . Copies of this information may be obtained for a duplicating fee by electronic request at the following E-mail address: publicinfo@sec.gov , or by writing the SEC’s Public Reference Section, Washington, D.C. 20549-0102.

If someone makes a statement about the fund that is not in this Prospectus, you should not rely upon that information. Neither the fund nor the distributors are offering to sell shares of the fund to any person to whom the fund may not lawfully sell its shares.

Filed under Rule 497(c)

File Nos. 33-43446 and 811-6444

November 1, 2007