Summary Prospectus March 1, 2024

Share class (Symbol): A (LAAAX), C (LAACX), FI (LAFIX), I (LAOIX), IS (LAOSX)

WESTERN ASSET

MACRO OPPORTUNITIES FUND

Before you invest, you may want to review the fund’s Prospectus, which contains more information about the fund and its risks. You can find the fund’s Prospectus and other information about the fund, including the fund’s statement of additional information and shareholder reports, online at www.franklintempleton.com/mutualfundsliterature. You can also get this information at no cost by calling the fund at 877-6LM-FUND/656-3863 or by sending an e-mail request to prospectus@franklintempleton.com, or from your financial intermediary. The fund’s Prospectus and statement of additional information, each dated March  1, 2024 (as may be amended or supplemented from time to time), and the independent registered public accounting firm’s report and financial statements in the fund’s annual report to shareholders, dated October 31, 2023, are incorporated by reference into this Summary Prospectus.

INVESTMENT PRODUCTS: NOT FDIC INSURED • NO BANK GUARANTEE • MAY LOSE VALUE

Investment objective

Maximize total return.

Fees and expenses of the fund

The accompanying table describes the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in funds distributed through Franklin Distributors, LLC (“Franklin Distributors” or the “Distributor”), the fund’s distributor. More information about these and other discounts is available from your Service Agent, in the fund’s Prospectus on page 34 under the heading “Additional information about each share class,” in the appendix titled “Appendix: Waivers and Discounts Available from Certain Service Agents” on page A-1 of the fund’s Prospectus and in the fund’s Statement of Additional Information (“SAI”) on page 75 under the heading “Sales Charge Waivers and Reductions for Class A Shares.” “Service Agents” include banks, brokers, dealers, insurance companies, investment advisers, financial consultants or advisers, mutual fund supermarkets and other financial intermediaries that have entered into an agreement with the Distributor to sell shares of the fund.

If you purchase Class I shares or Class IS shares through a Service Agent acting solely as an agent on behalf of its customers, that Service Agent may charge you a commission. Such commissions, if any, are not charged by the fund and are not reflected in the fee table or expense example below.

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Shareholder fees
(fees paid directly from your investment)
	Class A	Class C	Class FI	Class I	Class IS
Maximum sales charge (load) imposed on purchases (as a % of offering price)	3.751,2	None	None	None	None
Maximum deferred sales charge (load) (as a % of the lower of net asset value at purchase or redemption)3	None4	1.00	None	None	None
Small account fee5	$15	$15	None	None	None
Annual fund operating expenses (%)
(expenses that you pay each year as a percentage of the value of your investment)
	Class A	Class C	Class FI	Class I	Class IS
Management fees	1.15	1.15	1.15	1.15	1.15
Distribution and/or service (12b-1) fees	0.25	1.00	0.25	None	None
Other expenses	0.176	0.15	0.22	0.17	0.09
Total annual fund operating expenses	1.57	2.30	1.62	1.32	1.24

¹  The sales charge is waived for shareholders purchasing Class A shares through accounts where Franklin Distributors is the broker-dealer of record (“Distributor Accounts”).

² Shareholders purchasing Class A shares through certain Service Agents or in certain types of accounts may be eligible for a waiver of the sales charge. For additional information, see “Additional information about each share class — Sales charges” in the Prospectus.

³  Maximum deferred sales charge (load) may be reduced over time.

⁴  You may buy Class A shares in amounts of $500,000 or more at net asset value (without an initial sales charge), but if you redeem those shares within 18 months of their purchase, you will pay a contingent deferred sales charge of 1.00%.

⁵  If the value of your account is below $1,000 ($250 for retirement plans that are not employer-sponsored), the fund may charge you a fee of $3.75 per account that is determined and assessed quarterly by the fund or your Service Agent (with an annual maximum of $15.00 per account). Please contact your Service Agent or the fund for more information.

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⁶  Other expenses for Class A shares have been restated to exclude fees recaptured pursuant to the fund’s expense limitation arrangements. For the fiscal year ended October 31, 2023, amounts recaptured totaled 0.01% for Class A shares.

Example

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes:

● You invest $10,000 in the fund for the time periods indicated

● Your investment has a 5% return each year and the fund’s operating expenses remain the same (except that any applicable fee waiver or expense reimbursement is reflected only through its expiration date)

● You reinvest all distributions and dividends without a sales charge

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Number of years you own your shares ($)
	1 year	3 years	5 years	10 years
Class A (with or without redemption at end of period)	529	852	1,198	2,172
Class C (with redemption at end of period)	333	718	1,230	2,453
Class C (without redemption at end of period)	233	718	1,230	2,453
Class FI (with or without redemption at end of period)	165	511	881	1,922
Class I (with or without redemption at end of period)	134	418	723	1,589
Class IS (with or without redemption at end of period)	126	393	680	1,500

Portfolio turnover. The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 117% of the average value of its portfolio.

Principal investment strategies

Under normal circumstances, the fund seeks to achieve its investment objective by implementing an opportunistic investing strategy. The fund attempts to identify and capitalize on attractive relative-value opportunities principally in fixed income markets around the globe by investing in a variety of securities and other instruments (for example, by comparing spreads with a subadviser’s assessment of an issuer’s creditworthiness or by seeking to profit from the relative values of two related financial instruments by taking a single long or short position or by taking a long position with respect to one and a short position with respect to the other). Although the fund does not expect to invest in individual equities it may also invest in equity-related strategies, such as equity index futures and swaps, to the extent a subadviser believes those strategies are consistent with the fund’s overall objective and strategy. The fund’s trading strategy is expected to include positions based on longer-term outlooks, such as the subadvisers’

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views on long-term macroeconomic themes, and shorter-term circumstances. The fund has fewer restrictions than other fixed income funds and expects to trade actively.

The fund may enter into various derivative transactions for both hedging and non-hedging purposes, including for purposes of enhancing returns. These derivative transactions include, but are not limited to, futures, options, swaps and foreign currency futures, forwards and options.

In particular, the fund may use certain derivatives, including bond and interest rate futures, options on bonds, options on bond and interest rate futures, interest rate options, interest rate swaps, credit default swaps (on individual securities and/or baskets of securities), other options (including options on credit default swaps and options on currency forwards, futures and swaps), other futures, swaps, forwards, options on swaps, options on forwards, and mortgage-backed securities to a significant extent, although the amounts invested in these instruments may change from time to time.

Non-dollar securities may be held on a currency-hedged or -unhedged basis. The fund may engage (although it may choose not to) in currency exchange transactions to protect against uncertainty in the level of future exchange rates or to enhance returns. The fund may also engage in short sales or may otherwise hold short positions.

The derivatives used by the fund may represent a form of investment leverage in that the potential exposure of the fund may exceed its net assets. See “Leverage Risk” below for further discussion of related risks.

Although the fund may invest in securities of any maturity, the fund normally expects to maintain a dollar-weighted average effective duration (including futures positions), as estimated by the fund’s subadvisers, within the range of -5 to 10 years. Effective duration seeks to measure the expected sensitivity of market price to changes in interest rates, taking into account the anticipated effects of structural complexities (for example, some bonds can be prepaid by the issuer). The fund may invest in debt and fixed income securities of any credit quality, including securities that are in default.

In addition, under normal circumstances, at the time of purchase:

● No more than 75% of the fund’s net assets may be invested in non-dollar denominated securities.

● No more than 50% of the fund’s net assets may be invested in un-hedged non-U.S. dollar denominated securities, currency futures, forwards, or options measured at notional value, excluding instruments used for hedging purposes.

● No more than 50% of the fund’s net assets may be invested in debt and other fixed income securities rated below the Baa or BBB categories at the time of purchase by one or more Nationally Recognized Statistical Rating Organizations (“NRSROs”) or unrated securities of comparable quality at the time of purchase (as determined by the subadvisers). Securities rated below investment grade (i.e., securities rated below the Baa/BBB categories) are commonly known as “junk bonds” or “high yield securities.”

● No more than 50% of the fund’s net assets may be invested in securities of issuers in emerging markets.

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The fund considers a country to be an emerging market country if, at the time of investment, it is represented in the J.P. Morgan Emerging Market Bond Index Global or the J.P. Morgan Corporate Emerging Market Bond Index Broad or categorized by the World Bank in its annual categorization as middle- or low-income.

The fund is permitted to invest in securities issued or guaranteed by the government of the United States or any of the G-7 countries, including their agencies, instrumentalities and political sub-divisions, without limit; however, (i) no more than 10% of the fund’s net assets may be invested in securities issued or guaranteed by a single government that is a non-G-7 country, including its agencies, instrumentalities and sub-divisions; and (ii) other than as described above, no more than 5% of the fund’s net assets may be invested in the obligations of any single issuer, excluding investments in commingled investment vehicles.

The fund is “non-diversified” within the meaning of the Investment Company Act of 1940, as amended. As a result, the value of its shares will be more susceptible to any single economic, political or regulatory event affecting one or a small number of issuers than shares of a diversified fund. Because the fund may focus a significant portion of its investments in a single country or currency, it will be more susceptible to factors adversely affecting such currency or issuers within that country than would a more diversified portfolio of securities. The fund’s likely focus on a limited number of investment strategies at any given time subjects it to similar risks.

Principal risks

Risk is inherent in all investing. The value of your investment in the fund, as well as the amount of return you receive on your investment, may fluctuate significantly. You may lose part or all of your investment in the fund or your investment may not perform as well as other similar investments.

The fund’s investment strategies and portfolio investments differ from those of many other mutual funds. The subadvisers may devote a significant portion of the fund’s assets to pursuing an investment opportunity or strategy, including through the use of derivatives that create a form of investment leverage in the fund. This approach to investing may make the fund a more volatile investment than other mutual funds and cause the fund to perform less favorably than other mutual funds under similar market or economic conditions. The fund’s flexible investment strategy may make it difficult for an investor to evaluate the future risk profile of an investment in the fund because of the subadvisers’ ability to significantly change the composition of the fund’s investments. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or by any bank or government agency. The following is a summary description of certain risks of investing in the fund. The relative significance of the risks of investing in the fund may change over time.

Market and interest rate risk. The market prices of securities held by the fund may go up or down, sometimes rapidly or unpredictably. If the market prices of the fund’s securities fall, the value of your investment in the fund will decline. The market price of a security may fall due to general market conditions, such as real or perceived adverse economic or political conditions or trends, tariffs and trade disruptions, inflation, substantial economic downturn or recession, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. Changes in market conditions will not typically have the same impact on all types of securities.

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The value of your investment will generally go down when interest rates rise. A rise in rates tends to have a greater impact on the prices of longer term or duration securities. A general rise in interest rates may cause investors to move out of fixed income securities on a large scale, which could adversely affect the price and liquidity of fixed income securities and could also result in increased redemptions from the fund. Recently, there have been inflationary price movements. As a result, fixed income securities markets may experience heightened levels of interest rate volatility and liquidity risk. The U.S. Federal Reserve has raised interest rates from historically low levels. It may continue to raise interest rates. In addition, changes in monetary policy may exacerbate the risks associated with changing interest rates. Any additional interest rate increases in the future could cause the value of the fund’s holdings to decrease. It cannot be predicted when inflation will return to more normalized levels or how long financial authorities will counter inflationary pressures with monetary tightening.

The maturity of a security may be significantly longer than its duration. A security’s maturity and other features may be more relevant than its duration in determining the security’s sensitivity to other factors affecting the issuer or markets generally such as changes in credit quality or in the yield premium that the market may establish for certain types of securities.

Credit risk. If an issuer or guarantor of a security held by the fund or a counterparty to a financial contract with the fund defaults or its credit is downgraded, or is perceived to be less creditworthy, or if the value of the assets underlying a security declines, the value of your investment will typically decline. Changes in actual or perceived creditworthiness may occur quickly. The fund could be delayed or hindered in its enforcement of rights against an issuer, guarantor or counterparty. Subordinated securities (meaning securities that rank below other securities with respect to claims on the issuer’s assets) are more likely to suffer a credit loss than non-subordinated securities of the same issuer and will be disproportionately affected by a default, downgrade or perceived decline in creditworthiness.

High yield (“junk”) bonds risk. High yield bonds are generally subject to greater credit risks than higher-grade bonds, including the risk of default on the payment of interest or principal. High yield bonds are considered speculative, typically have lower liquidity and are more difficult to value than higher grade bonds. High yield bonds tend to be volatile and more susceptible to adverse events, credit downgrades and negative sentiments and may be difficult to sell at a desired price, or at all, during periods of uncertainty or market turmoil.

Derivatives risk. Using derivatives can increase fund losses and reduce opportunities for gains, such as when market prices, interest rates, currencies, or the derivatives themselves behave in a way not anticipated by the fund’s subadviser. Using derivatives also can have a leveraging effect and increase fund volatility. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. Derivatives may not be available at the time or price desired, may be difficult to sell, unwind or value, and the counterparty may default on its obligations to the fund. Derivatives are generally subject to the risks applicable to the assets, rates, indices or other indicators underlying the derivative. The value of a derivative may fluctuate more than the underlying assets, rates, indices or other indicators to which it relates. Use of derivatives may have different tax consequences for the fund than an investment in the underlying asset, and those differences may affect the amount, timing and character of income distributed to shareholders. The U.S. government and foreign governments have adopted and implemented regulations governing derivatives markets, including mandatory clearing of certain derivatives,

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margin and reporting requirements. The ultimate impact of the regulations remains unclear. Additional regulation of derivatives may make derivatives more costly, limit their availability or utility, otherwise adversely affect their performance or disrupt markets.

Credit default swap contracts involve heightened risks and may result in losses to the fund. Credit default swaps may be illiquid and difficult to value. When the fund sells credit protection via a credit default swap, credit risk increases since the fund has exposure to both the issuer whose credit is the subject of the swap and the counterparty to the swap.

Leverage risk. The value of your investment may be more volatile if the fund borrows or uses instruments, such as derivatives, that have a leveraging effect on the fund’s portfolio. Other risks described in the Prospectus also will be compounded because leverage generally magnifies the effect of a change in the value of an asset and creates a risk of loss of value on a larger pool of assets than the fund would otherwise have had. The fund may also have to sell assets at inopportune times to satisfy its obligations created by the use of leverage or derivatives. The use of leverage is considered to be a speculative investment practice and may result in the loss of a substantial amount, and possibly all, of the fund’s assets. In addition, the fund’s portfolio will be leveraged if it exercises its right to delay payment on a redemption, and losses will result if the value of the fund’s assets declines between the time a redemption request is deemed to be received by the fund and the time the fund liquidates assets to meet redemption requests.

Illiquidity risk. Some assets held by the fund may be or become impossible or difficult to sell and some assets that the fund wants to invest in may be impossible or difficult to purchase, particularly during times of market turmoil or due to adverse changes in the conditions of a particular issuer. These illiquid assets may also be volatile and difficult to value. Markets may become illiquid quickly. Markets may become illiquid when, for instance, there are few, if any, interested buyers or sellers or when dealers are unwilling or unable to make a market for certain securities. As a general matter, dealers have been less willing to make markets in recent years. Federal banking regulations may also cause certain dealers to reduce their inventories of certain securities, which may further decrease the fund’s ability to buy or sell such securities. During times of market turmoil, there have been, and may be, no buyers or sellers for securities in entire asset classes. If the fund is forced to sell an illiquid asset to meet redemption requests or other cash needs, or to try to limit losses, the fund may be forced to sell at a substantial loss or may not be able to sell at all. The fund may not receive its proceeds from the sale of certain securities for an extended period (for example, several weeks or even longer). The liquidity of certain assets, particularly of privately-issued and non-investment grade mortgage-backed securities, asset-backed securities and collateralized debt obligations, may be difficult to ascertain and may change over time.

Foreign investments and emerging markets risk. The fund’s investments in securities of foreign issuers or issuers with significant exposure to foreign markets involve additional risk as compared to investments in U.S. securities or issuers with predominantly U.S. exposure, such as less liquid, less transparent, less regulated and more volatile markets. The value of the fund’s investments may decline because of factors affecting the particular issuer as well as foreign markets and issuers generally, such as unfavorable or unsuccessful government actions, reduction of government or central bank support, inadequate accounting standards and auditing and financial recordkeeping requirements, lack of information, political, economic, financial or social instability, terrorism, armed conflicts and other geopolitical events, and the impact of

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tariffs and other restrictions on trade or economic sanctions. Geopolitical or other events such as nationalization or expropriation could even cause the loss of the fund’s entire investment in one or more countries.

In addition, there may be significant obstacles to obtaining information necessary for investigations into or litigation against issuers located in or operating in certain foreign markets, particularly emerging market countries, and shareholders may have limited legal remedies. To the extent the fund focuses its investments in a single country or only a few countries in a particular geographic region, economic, political, regulatory or other conditions affecting such country or region may have a greater impact on fund performance relative to a more geographically diversified fund.

The value of investments in securities denominated in foreign currencies increases or decreases as the rates of exchange between those currencies and the U.S. dollar change. Currency conversion costs and currency fluctuations could erase investment gains or add to investment losses. Currency exchange rates can be volatile, and are affected by factors such as general economic and political conditions, the actions of the U.S. and foreign governments or central banks, the imposition of currency controls and speculation. The fund may be unable or may choose not to hedge its foreign currency exposure.

Less developed markets are more likely to experience problems with the clearing and settling of trades and the holding of securities by local banks, agents and depositories. Settlement of trades in these markets can take longer than in other markets and the fund may not receive its proceeds from the sale of certain securities for an extended period (possibly several weeks or even longer).

The risks of foreign investments are heightened when investing in issuers in emerging market countries. Emerging market countries tend to have economic, political and legal systems that are less developed and are less stable than those of more developed countries. Their economies tend to be less diversified than those of more developed countries. They typically have fewer medical and economic resources than more developed countries, and thus they may be less able to control or mitigate the effects of a pandemic or a natural disaster. They are often particularly sensitive to market movements because their market prices tend to reflect speculative expectations. Low trading volumes may result in a lack of liquidity and in extreme price volatility.

Sovereign debt risk. Sovereign government and supranational debt involve many of the risks of foreign and emerging markets investments as well as the risk of debt moratorium, repudiation or renegotiation, and the fund may be unable to enforce its rights against the issuers. Sovereign debt risk is increased for emerging market issuers.

Risks of Investing in China Interbank Bond Market through Bond Connect. Chinese debt instruments trade on the China Interbank Bond Market (“CIBM”) and may be purchased through a market access program that is designed to, among other things, enable foreign investment in the People’s Republic of China (“Bond Connect”). There are distinct operational and regulatory risks inherent in investing in debt instruments traded on the CIBM in addition to the risks typically associated with investments in emerging market countries. The prices of debt instruments traded on the CIBM may fluctuate significantly due to low trading volume and potential lack of liquidity. The rules to access debt instruments that trade on the CIBM through Bond Connect are relatively new and subject to change, which may adversely affect the fund’s ability to invest in these

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instruments and to enforce its rights as a beneficial owner of these instruments. Trading through Bond Connect is subject to a number of restrictions that may affect the fund’s investments and returns.

Prepayment or call risk. Many issuers have a right to prepay their fixed income securities. Issuers may be more likely to prepay their securities if interest rates fall. If this happens, the fund may not benefit from the rise in the market price of the securities that normally accompanies a decline in interest rates, and will be forced to reinvest prepayment proceeds at a time when yields on securities available in the market are lower than the yield on prepaid securities. The fund may also lose any premium it paid to purchase the securities.

Extension risk. When interest rates rise, repayments of fixed income securities, particularly asset- and mortgage- backed securities, may occur more slowly than anticipated, extending the effective duration of these fixed income securities at below market interest rates and causing their market prices to decline more than they would have declined due to the rise in interest rates alone. This may cause the fund’s share price to be more volatile.

Non-diversification risk. The fund is classified as “non-diversified,” which means it may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund. To the extent the fund invests its assets in a smaller number of issuers, the fund will be more susceptible to negative events affecting those issuers than a diversified fund.

Valuation risk. The sales price the fund could receive for any particular portfolio investment may differ from the fund’s valuation of the investment, particularly for securities that trade in thin or volatile markets or that are valued using a fair value methodology. These differences may increase significantly and affect fund investments more broadly during periods of market volatility. Investors who purchase or redeem fund shares on days when the fund is holding fair-valued securities may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the fund had not fair-valued securities or had used a different valuation methodology. The fund’s ability to value its investments may be impacted by technological issues and/or errors by pricing services or other third party service providers. The valuation of the fund’s investments involves subjective judgment, which may prove to be incorrect.

Market events risk. The market values of securities or other assets will fluctuate, sometimes sharply and unpredictably, due to factors such as economic events, governmental actions or intervention, actions taken by the U.S. Federal Reserve or foreign central banks, market disruptions caused by trade disputes, labor strikes or other factors, political developments, armed conflicts, economic sanctions and countermeasures in response to sanctions, major cybersecurity events, the global and domestic effects of widespread or local health, weather or climate events, and other factors that may or may not be related to the issuer of the security or other asset. Economies and financial markets throughout the world are increasingly interconnected. Economic, financial or political events, trading and tariff arrangements, public health events, terrorism, wars, natural disasters and other circumstances in one country or region could have profound impacts on global economies or markets. As a result, whether or not the fund invests in securities of issuers located in or with significant exposure to the countries or markets directly affected, the value and liquidity of the fund’s investments may be negatively affected. Following Russia’s invasion of Ukraine in 2022, Russian stocks lost all, or nearly all, of

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their market value. Other securities or markets could be similarly affected by past or future geopolitical or other events or conditions. Furthermore, events involving limited liquidity, defaults, non-performance or other adverse developments that affect one industry, such as the financial services industry, or concerns or rumors about any events of these kinds, have in the past and may in the future lead to market-wide liquidity problems, may spread to other industries, and could negatively affect the value and liquidity of the fund’s investments.

Raising the ceiling on U.S. government debt has become increasingly politicized. Any failure to increase the total amount that the U.S. government is authorized to borrow could lead to a default on U.S. government obligations, with unpredictable consequences for economies and markets in the U.S. and elsewhere. Recently, inflation and interest rates have increased and may rise further. These circumstances could adversely affect the value and liquidity of the fund’s investments, impair the fund’s ability to satisfy redemption requests, and negatively impact the fund’s performance.

The United States and other countries are periodically involved in disputes over trade and other matters, which may result in tariffs, investment restrictions and adverse impacts on affected companies and securities. For example, the United States has imposed tariffs and other trade barriers on Chinese exports, has restricted sales of certain categories of goods to China, and has established barriers to investments in China. Trade disputes may adversely affect the economies of the United States and its trading partners, as well as companies directly or indirectly affected and financial markets generally. The United States government has prohibited U.S. persons from investing in Chinese companies designated as related to the Chinese military. These and possible future restrictions could limit the fund’s opportunities for investment and require the sale of securities at a loss or make them illiquid. Moreover, the Chinese government is involved in a longstanding dispute with Taiwan that has included threats of invasion. If the political climate between the United States and China does not improve or continues to deteriorate, if China were to attempt unification of Taiwan by force, or if other geopolitical conflicts develop or get worse, economies, markets and individual securities may be severely affected both regionally and globally, and the value of the fund’s assets may go down.

Hedging risk. There can be no assurance that the fund will engage in hedging transactions at any given time, even under volatile market conditions, or that any hedging transactions the fund engages in will be successful. Hedging transactions involve costs and may reduce gains or result in losses.

Commodities risk. Commodity prices can be extremely volatile and are affected by many factors. Exposure to commodities can cause the value of the fund’s shares to decline or fluctuate in a rapid and unpredictable manner. Investments in commodity-linked instruments may subject the fund to greater volatility than investments in traditional securities or the commodity, commodities or commodity index to which they relate. The value of commodities and commodity-linked instruments may be affected, for example, by changes in overall market movements, real or perceived inflationary trends, commodity index volatility, prolonged or intense speculation by investors, changes in interest rates or factors affecting a particular industry or commodity, such as drought, floods, other weather phenomena, livestock disease, embargoes, tariffs, economic sanctions, armed conflicts and international economic, political and regulatory developments. The prices of commodities can also fluctuate widely due to supply and demand disruptions in major producing or consuming regions. The fund’s ability to gain exposure to commodities using

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derivatives or other means may be limited by tax considerations. If the fund has taken a long or short position in a commodity using futures contracts or other derivatives, it might be required to take or make delivery of the underlying commodity under undesirable circumstances. This would cause the fund to incur a number of costs. To the extent the fund focuses its investments in a particular commodity, the fund will be more susceptible to risks associated with the particular commodity. No active trading market may exist for certain commodities investments.

Commodity regulatory risk. The fund is a “commodity pool” and the fund’s manager is registered as a “commodity pool operator” under the Commodity Exchange Act with respect to the fund. As a result, additional disclosure, reporting and recordkeeping obligations mandated by the U.S. Commodity Futures Trading Commission (“CFTC”) apply with respect to the fund. The fund’s manager is therefore subject to dual regulation by the Securities and Exchange Commission and the CFTC. Notwithstanding the foregoing, the CFTC has adopted rules that allow for substituted compliance with certain CFTC disclosure and shareholder reporting requirements based on compliance with comparable SEC requirements. This means that for most of the CFTC’s disclosure and shareholder reporting applicable to the manager as the fund’s commodity pool operator, the manager’s and the fund’s compliance with SEC disclosure and shareholder reporting requirements will be deemed to fulfill the manager’s CFTC compliance obligations. The CFTC has neither reviewed nor approved the fund, its investment strategies, or this Prospectus.

Investment in loans risk. Investments in loans are generally subject to the same risks as investments in other types of debt obligations, including, among others, credit risk, interest rate risk, prepayment risk, and extension risk. In addition, in many cases loans are subject to the risks associated with below-investment grade securities. This means loans are often subject to significant credit risks, including a greater possibility that the borrower will be adversely affected by changes in market or economic conditions and may default or enter bankruptcy. This risk of default will increase in the event of an economic downturn or a substantial increase in interest rates (which will increase the cost of the borrower’s debt service). Transactions in loans may settle on a delayed basis. As a result, the proceeds from the sale of a loan may not be available to make additional investments or to meet the fund’s redemption obligations. Because junior loans are unsecured and subordinated and thus lower in priority of payment to senior loans, they are subject to the additional risk that the cash flow of the borrower and property securing the loan or debt, if any, may be insufficient to meet scheduled payments after giving effect to the senior secured obligations of the borrower. Bank loans may not be considered securities under federal securities laws and therefore, the fund may not have the protections afforded by U.S. federal securities laws with respect to such investments.

Covenant lite loans risk. Covenant lite loans contain fewer maintenance covenants, or no maintenance covenants at all, than traditional loans and may not include terms that allow the lender to monitor the financial performance of the borrower and declare a default if certain criteria are breached. Accordingly, the fund may have fewer rights against a borrower when it invests in or has exposure to covenant lite loans. This may expose the fund to greater credit risk associated with the borrower and reduce the fund’s ability to restructure a problematic loan and mitigate potential loss. As a result, the fund’s exposure to losses on such investments may be increased, especially during a downturn in the credit cycle.

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Risks relating to inflation-indexed securities. The value of inflation-indexed fixed income securities generally fluctuates in response to changes in real interest rates, which are in turn tied to the relationship between nominal interest rates and the rate of inflation. If nominal interest rates increase at a faster rate than inflation, real interest rates might rise, leading to a decrease in value of inflation-indexed securities. The fund may also experience a loss on an inflation-indexed security if there is deflation. If inflation is lower than expected during the period the fund holds an inflation-indexed security, the fund may earn less on the security than on a conventional bond.

Mortgage-backed and asset-backed securities risk. When market interest rates increase, the market values of mortgage-backed securities decline. At the same time, mortgage refinancings and prepayments slow, which lengthens the effective duration of these securities. As a result, the negative effect of the interest rate increase on the market value of mortgage-backed securities is usually more pronounced than it is for other types of fixed income securities, potentially increasing the volatility of the fund. Conversely, when market interest rates decline, while the value of mortgage-backed securities may increase, the rate of prepayment of the underlying mortgages also tends to increase, which shortens the effective duration of these securities. Mortgage-backed securities are also subject to the risk that underlying borrowers will be unable to meet their obligations and the value of property that secures the mortgage may decline in value and be insufficient, upon foreclosure, to repay the associated loan. Investments in asset-backed securities are subject to similar risks. The ability of an issuer of asset-backed securities to enforce its security interest in the underlying assets may be limited, and therefore certain asset-backed securities present a heightened level of risk.

Convertible securities risk. Convertible securities are subject to stock market and other risks associated with equity securities, as well as the credit, interest rate and other risks associated with fixed income securities. Credit risk is the risk that the issuer or obligor will not make timely payments of principal or interest or that its credit may be downgraded or perceived to be less creditworthy. Interest rate risk is the risk that the value of a fixed income security will fall when interest rates rise. A rise in rates tends to have a greater impact on the prices of longer term or duration securities. A general rise in interest rates may cause investors to move out of fixed income securities on a large scale, which could adversely affect the price and liquidity of fixed income securities. As the market price of the equity security underlying a convertible security falls, the convertible security tends to trade on the basis of its yield and other fixed income characteristics. As the market price of the equity security underlying a convertible security rises, the convertible security tends to trade on the basis of its equity conversion features.

Contingent convertible securities (“CoCos”) risk. CoCos are hybrid securities most commonly issued by banking institutions that present risks similar to debt securities and convertible securities. CoCos are a form of hybrid security that are intended to either convert into equity or have their principal written down upon the occurrence of certain triggers. When an issuer’s capital ratio falls below a specified trigger level, or in a regulator’s discretion depending on the regulator’s judgment about the issuer’s solvency prospects, a CoCo may be written down, written off or converted into an equity security. Due to the contingent write-down, write-off and conversion feature, CoCos may have substantially greater risk than other securities in times of financial stress. If the trigger level is breached, the issuer’s decision to write down, write off or convert a CoCo may be outside its control, and the fund may suffer a complete loss on an

Western Asset Macro Opportunities Fund   13

investment in CoCos with no chance of recovery even if the issuer remains in existence. The value of CoCos is unpredictable and may be influenced by many factors including, without limitation: the creditworthiness of the issuer and/or fluctuations in such issuer’s applicable capital ratios; supply and demand for CoCos; general market conditions and available liquidity; and economic, financial and political events that affect the issuer, its particular market or the financial markets in general.

Portfolio management risk. The value of your investment may decrease if the subadvisers’ judgment about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, or about interest rates or other market factors, is incorrect or does not produce the desired results, or if there are imperfections, errors or limitations in the models, tools and data used by the subadvisers. In addition, the fund’s investment strategies or policies may change from time to time. Those changes may not lead to the results intended by the subadvisers and could have an adverse effect on the value or performance of the fund.

Redemption risk. The fund may experience heavy redemptions that could cause the fund to liquidate its assets at inopportune times or unfavorable prices or increase or accelerate taxable gains or transaction costs and may negatively affect the fund’s net asset value, performance, or ability to satisfy redemptions in a timely manner, which could cause the value of your investment to decline.

Cybersecurity risk. Like other funds and business enterprises, the fund, the manager, the subadvisers and their service providers are subject to the risk of cyber incidents occurring from time to time. Cybersecurity incidents, whether intentionally caused by third parties or otherwise, may allow an unauthorized party to gain access to fund assets, fund or customer data (including private shareholder information) or proprietary information, cause the fund, the manager, the subadvisers and/or their service providers (including, but not limited to, fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) to suffer data breaches, data corruption or loss of operational functionality, or prevent fund investors from purchasing, redeeming or exchanging shares, receiving distributions or receiving timely information regarding the fund or their investment in the fund. The fund, the manager, and the subadvisers have limited ability to prevent or mitigate cybersecurity incidents affecting third party service providers, and such third party service providers may have limited indemnification obligations to the fund, the manager, and/or the subadvisers. Cybersecurity incidents may result in financial losses to the fund and its shareholders, and substantial costs may be incurred in order to prevent or mitigate any future cybersecurity incidents. Issuers of securities in which the fund invests are also subject to cybersecurity risks, and the value of these securities could decline if the issuers experience cybersecurity incidents.

New ways to carry out cyber attacks continue to develop. There is a chance that some risks have not been identified or prepared for, or that an attack may not be detected, which puts limitations on the fund’s ability to plan for or respond to a cyber attack.

These and other risks are discussed in more detail in the Prospectus or in the Statement of Additional Information.

  14 Western Asset Macro Opportunities Fund

Performance

The accompanying bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund’s performance from year to year for Class A shares. The table shows the average annual total returns of each class of the fund that has been in operation for at least one full calendar year and also compares the fund’s performance with the average annual total returns of an index or other benchmark. Performance for classes other than those shown may vary from the performance shown to the extent the expenses for those classes differ. The fund makes updated performance information, including its current net asset value, available at www.franklintempleton.com/mutualfunds (select fund and share class), or by calling the fund at 877-6LM-FUND/656-3863.

The fund’s past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future.

Sales charges are not reflected in the accompanying bar chart, and if those charges were included, returns would be less than those shown.

Best Quarter (12/31/2023): 17.78 Worst Quarter (03/31/2022): (18.03)

Western Asset Macro Opportunities Fund   15

Average annual total returns (%)
(for periods ended December 31, 2023)
Class A	1 year	5 years	10 years
Return before taxes	11.38	1.43	3.01
Return after taxes on distributions	11.35	0.53	1.81
Return after taxes on distributions and sale of fund shares	6.74	0.79	1.88
Other Classes (Return before taxes only)
Class C	13.82	1.58	2.72
Class FI	15.73	2.30	3.43
Class I	16.06	2.61	3.73
Class IS	16.09	2.69	3.83
ICE BofA 3-Month U.S. Treasury Bill Index (reflects no deduction for fees, expenses or taxes)	5.02	1.88	1.25
ICE BofA US Dollar 3-Month Deposit Offered Rate Constant Maturity Index (reflects no deduction for fees, expenses or taxes)	5.12	2.02	1.44

The after-tax returns are shown only for Class A shares, are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns for classes other than Class A will vary from returns shown for Class A.

Management

Investment manager: Franklin Templeton Fund Adviser, LLC (“FTFA”) (formerly known as Legg Mason Partners Fund Advisor, LLC)

Subadvisers: Western Asset Management Company, LLC (“Western Asset”), Western Asset Management Company Limited in London (“Western Asset London”), Western Asset Management Company Pte. Ltd. in Singapore (“Western Asset Singapore”) and Western Asset Management Company Ltd in Japan (“Western Asset Japan”). References to the “subadviser” include each applicable subadviser.

Investment professionals: Primary responsibility for the day-to-day management of the fund lies with the following investment professionals. These investment professionals, all of whom are employed by Western Asset, work together with a broader investment management team.

Investment professional	Title	Investment professional of the fund since
S. Kenneth Leech	Co-Chief Investment Officer	2013*
Gordon Brown	Head of Global Portfolios	March 2024
Michael C. Buchanan	Co-Chief Investment Officer	March 2024

  16 Western Asset Macro Opportunities Fund

Prashant Chandran	Portfolio Manager	2013
Amit Chopra	Portfolio Manager	March 2024
Mark S. Lindbloom	Portfolio Manager	March 2024

* In addition, Mr. Leech had previously served as a member of the portfolio management team of the fund.

Purchase and sale of fund shares

You may purchase, redeem or exchange shares of the fund each day the New York Stock Exchange is open, at the fund’s net asset value determined after receipt of your request in good order, subject to any applicable sales charge.

The fund’s initial and subsequent investment minimums generally are set forth in the accompanying table:

Investment minimum initial/additional investment ($)
	Class A	Class C1	Class FI2	Class I	Class IS
General	1,000/50	1,000/50	N/A	1 million/None3	N/A
Uniform Gifts or Transfers to Minor Accounts	1,000/50	1,000/50	N/A	1 million/None3	N/A
IRAs	250/50	250/50	N/A	1 million/None3,4	N/A4
SIMPLE IRAs	None/None	None/None	N/A	1 million/None3	N/A
Systematic Investment Plans	25/25	25/25	N/A	1 million/None3,5	N/A5
Clients of Eligible Financial Intermediaries	None/None	N/A	None/ None	None/None6	None/None6
Eligible Investment Programs	None/None	N/A	None/ None	None/None	None/None
Omnibus Retirement Plans	None/None	None/None	None/ None	None/None	None/None
Individual Retirement Plans except as noted	None/None	None/None	N/A	1 million/None3	N/A
Institutional Investors	1,000/50	1,000/50	N/A	1 million/None	1 million/None

¹  Class C shares are not available for purchase through Distributor Accounts.

²  Class FI shares are not available for purchase through Distributor Accounts.

³  Available to investors investing directly with the fund.

⁴  IRA accountholders who purchase Class I or Class IS shares through a Service Agent acting as agent on behalf of its customers are subject to the initial and subsequent minimums of $250/$50. If a Service Agent does not have this arrangement in place with the Distributor, the initial and subsequent minimums listed in the table apply. Please contact your Service Agent for more information.

⁵  Investors investing through a Systematic Investment Plan who purchase Class I or Class IS shares through a Service Agent acting as agent on behalf of its customers are subject to the initial and subsequent minimums of $25/$25. If a Service Agent does not have this arrangement in place with the Distributor, the initial and subsequent minimums listed in the table apply. Please contact your Service Agent for more information.

Western Asset Macro Opportunities Fund   17

⁶  Individual investors who purchase Class I shares or Class IS shares through a Service Agent acting as agent on behalf of its customers are subject to the initial and subsequent minimums of $1,000/$50. If a Service Agent does not have this arrangement in place with the Distributor, the initial and subsequent minimums listed in the table apply. Please contact your Service Agent for more information.

Your Service Agent may impose higher or lower investment minimums, or may impose no minimum investment requirement.

For more information about how to purchase, redeem or exchange shares, and to learn which classes of shares are available to you, you should contact your Service Agent, or, if you hold your shares or plan to purchase shares through the fund, you should contact the fund by phone at 877-6LM-FUND/656-3863, by regular mail at Legg Mason Funds, P.O. Box 33030, St. Petersburg, FL 33733-8030 or by express, certified or registered mail at Legg Mason Funds, 100 Fountain Parkway, St. Petersburg, FL 33716-1205.

Tax information

The fund’s distributions are generally taxable as ordinary income or capital gains.

Payments to broker/dealers and other financial intermediaries

The fund’s related companies pay Service Agents for the sale of fund shares, shareholder services and other purposes. These payments create a conflict of interest by influencing your Service Agent or its employees or associated persons to recommend the fund over another investment. Ask your financial adviser or salesperson or visit your Service Agent’s or salesperson’s website for more information.

  18 Western Asset Macro Opportunities Fund

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