Franklin Strategic Series

09/03/2024 | Press release | Distributed by Public on 09/03/2024 06:14

Summary Prospectus by Investment Company - Form 497K

SUMMARY PROSPECTUS

FRANKLIN STRATEGIC INCOME FUND

Franklin Strategic Series

September 1, 2024

Class A

Class C

Class R

Advisor Class

FRSTX

FSGCX

FKSRX

FKSAX

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, statement of additional information, reports to shareholders and other information about the Fund online at www.franklintempleton.com/prospectus. You can also get this information at no cost by calling (800) DIAL BEN/342-5236 or by sending an e-mail request to [email protected]. The Fund's prospectus and statement of additional information, both dated September 1, 2024, as may be supplemented, are all incorporated by reference into this Summary Prospectus.

FRANKLIN STRATEGIC INCOME FUND
SUMMARY PROSPECTUS

Investment Goal

To earn a high level of current income. A secondary goal is capital appreciation over the long term.

Fees and Expenses of the Fund

These tables describe the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees (including on Class R6 and Advisor Class shares), 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 in Class A if you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton funds and certain other funds distributed through Franklin Distributors, LLC, the Fund's distributor. More information about these and other discounts is available from your financial professional and under "Your Account" on page 47 in the Fund's Prospectus and under "Buying and Selling Shares" on page 86 of the Fund's Statement of Additional Information. In addition, more information about sales charge discounts and waivers for purchases of shares through specific financial intermediaries is set forth in Appendix A - "Intermediary Sales Charge Discounts and Waivers" to the Fund's prospectus.

Shareholder Fees

(fees paid directly from your investment)

Class A

Class C

Class R

Class R6

Advisor
Class

Maximum Sales Charge (Load)
Imposed on Purchases (as percentage of offering price)

3.75%

None

None

None

None

Maximum Deferred Sales Charge
(Load) (as percentage of the lower of original purchase price or sale proceeds)

None

1

1.00%

None

None

None

1.

There is a 1% contingent deferred sales charge that applies to investments of $500,000 or more (see "Investments of $500,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without an initial sales charge on shares sold within 18 months of purchase.

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Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Class A

Class C

Class R

Class R6

Advisor
Class

Management fees

0.46%

0.46%

0.46%

0.46%

0.46%

Distribution and service (12b-1) fees

0.25%

0.65%

0.50%

None

None

Other expenses

0.23%

0.23%

0.23%

0.12%

0.23%

Acquired fund fees and expenses

0.02%

0.02%

0.02%

0.02%

0.02%

Total annual Fund operating expenses1

0.96%

1.36%

1.21%

0.60%

0.71%

Fee waiver and/or expense reimbursement2

-0.02%

-0.02%

-0.02%

-0.03%

-0.02%

Total annual Fund operating expenses after fee waiver and/or expense reimbursement1

0.94%

1.34%

1.19%

0.57%

0.69%

1. Total annual Fund operating expenses differ from the ratio of expenses to average net assets shown in the Financial Highlights, which reflect the operating expenses of the Fund and do not include acquired fund fees and expenses.

2. The investment manager has agreed to reduce its fees to reflect reduced services resulting from the Fund's investments in Franklin Templeton affiliated funds. In addition, the transfer agency fees on Class R6 shares of the Fund have been capped so that transfer agency fees for that class do not exceed 0.03%. These arrangements are expected to continue until August 31, 2025. During the terms, the fee waiver and expense reimbursement agreements may not be terminated or amended without approval of the board of trustees except to add series or classes, to reflect the extension of termination dates or to lower the waiver and expense limitation (which would result in lower fees for shareholders).

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 that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of the period. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The Example reflects adjustments made to the Fund's operating expenses due to the fee waivers and/or expense reimbursements by management for the 1 Year numbers only. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

1 Year

3 Years

5 Years

10 Years

Class A

$467

$667

$883

$1,506

Class C

$236

$429

$743

$1,525

Class R

$121

$382

$663

$1,464

Class R6

$58

$189

$332

$747

Advisor Class

$70

$225

$393

$880

If you do not sell your shares:

Class C

$136

$429

$743

$1,525

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FRANKLIN STRATEGIC INCOME FUND
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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 Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 65.73% of the average value of its portfolio.

Principal Investment Strategies

Under normal market conditions, the Fund invests at least 65% of its assets in U.S. and foreign debt securities, including those in emerging markets. Debt securities include all varieties of fixed, variable and floating rate income securities, including bonds, U.S. and foreign government and agency securities, corporate loans (and loan participations) and mortgage-backed securities and other asset-backed securities. The Fund shifts its investments among various classes of debt securities and at any given time may have a substantial amount of its assets invested in any class of debt security.

The Fund may invest up to 100% of its assets in high yield, lower-quality debt securities (also known as "junk bonds"). The below-investment grade debt securities in which the Fund invests are generally rated at least Caa by Moody's Investors Service (Moody's) or CCC by S&P Global Ratings (S&P) or are unrated securities the Fund's investment manager determines are of comparable quality.

The Fund may invest in many different securities issued or guaranteed by the U.S. government or by non-U.S. governments, or their respective agencies or instrumentalities, including mortgage-backed securities and inflation-indexed securities issued by the U.S. Treasury. Mortgage-backed securities represent an interest in a pool of mortgage loans made by banks and other financial institutions to finance purchases of homes, commercial buildings and other real estate. The individual mortgage loans are packaged or "pooled" together for sale to investors. As the underlying mortgage loans are paid off, investors receive principal and interest payments. These securities may be fixed-rate or adjustable-rate mortgage-backed securities (ARMS). The Fund may purchase or sell mortgage-backed securities on a delayed delivery or forward commitment basis through the "to-be-announced" (TBA) market. With TBA transactions, the particular securities to be delivered must meet specified terms and standards. The Fund may also invest a small portion of its assets directly in mortgage loans.

For purposes of pursuing its investment goals, the Fund regularly enters into various currency-related transactions involving derivative instruments, including

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currency and cross currency forwards, currency swaps, currency and currency index futures contracts and currency options. The Fund regularly enters into interest rate and credit-related transactions involving derivative instruments, including interest rate, fixed income total return and credit default swaps and interest rate and/ or bond futures contracts. The use of these derivative transactions may allow the Fund to obtain net long or net short exposures to selected currencies, interest rates, countries, durations or credit risks. These derivative instruments may also be used for hedging purposes, to enhance Fund returns or to obtain exposure to various market sectors.

The Fund may invest a significant portion of its assets in complex fixed income securities, such as collateralized debt obligations ("CDOs"), which are generally a type of asset-backed securities. The Fund's investments in CDOs may include investments in collateralized loan obligations (CLOs), which are a type of CDO.

The Fund's investment manager is a research driven, fundamental investor that relies on a team of analysts to provide in-depth industry expertise and uses both qualitative and quantitative analysis to evaluate issuers. The Fund uses an active asset allocation strategy to try to achieve its investment goals. The investment manager uses a "top-down" analysis of macroeconomic trends combined with a "bottom-up" fundamental analysis of market sectors, industries, and issuers to try to take advantage of varying sector reactions to economic events.

Principal Risks

You could lose money by investing in the Fund. Mutual fund shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. government.

Credit: An issuer of debt securities may fail to make interest payments or repay principal when due, in whole or in part. Changes in an issuer's financial strength or in a security's or government's credit rating may affect a security's value.

High-Yield Debt Instruments: Issuers of lower-rated or "high-yield" debt instruments (also known as "junk bonds") are not as strong financially as those issuing higher credit quality debt instruments. High-yield debt instruments are generally considered predominantly speculative by the applicable rating agencies as their issuers are more likely to encounter financial difficulties because they may be more highly leveraged, or because of other considerations. In addition, high yield debt instruments generally are more vulnerable to changes in the relevant economy, such as a recession or a sustained period of rising interest rates, that could affect their ability to make interest and principal payments when due. The prices of high-yield debt instruments generally fluctuate more than those of higher

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credit quality. High-yield debt instruments are generally more illiquid (harder to sell) and harder to value.

Interest Rate: When interest rates rise, debt security prices generally fall. The opposite is also generally true: debt security prices rise when interest rates fall. Interest rate changes are influenced by a number of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, and supply of and demand for bonds. In general, securities with longer maturities or durations are more sensitive to interest rate changes.

Market: The market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly or unpredictably. The market value of a security or other investment may be reduced by market activity or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more buyers than sellers, prices tend to rise.

Income: The Fund's distributions to shareholders may decline when prevailing interest rates fall, when the Fund experiences defaults on debt securities it holds or when the Fund realizes a loss upon the sale of a debt security.

Variable Rate Securities: Because changes in interest rates on variable rate securities (including floating rate securities) may lag behind changes in market rates, the value of such securities may decline during periods of rising interest rates until their interest rates reset to market rates. During periods of declining interest rates, because the interest rates on variable rate securities generally reset downward, their market value is unlikely to rise to the same extent as the value of comparable fixed rate securities.

Foreign Securities (non-U.S.): Investing in foreign securities typically involves more risks than investing in U.S. securities, and includes risks associated with: (i) internal and external political and economic developments - e.g., the political, economic and social policies and structures of some foreign countries may be less stable and more volatile than those in the U.S. or some foreign countries may be subject to trading restrictions or economic sanctions; diplomatic and political developments could affect the economies, industries, and securities and currency markets of the countries in which the Fund is invested, which can include rapid and adverse political changes; social instability; regional conflicts; sanctions imposed by the United States, other nations or other governmental entities, including supranational entities; terrorism; and war; (ii) trading practices - e.g., government supervision and regulation of foreign securities and currency markets, trading systems and brokers may be less than in the U.S.; (iii) availability of information - e.g., foreign issuers may not be subject to the same disclosure, accounting and financial reporting standards and practices as U.S. issuers; (iv) limited markets -

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e.g., the securities of certain foreign issuers may be less liquid (harder to sell) and more volatile; and (v) currency exchange rate fluctuations and policies - e.g., fluctuations may negatively affect investments denominated in foreign currencies and any income received or expenses paid by the Fund in that foreign currency.

Sovereign Debt Securities: Sovereign debt securities are subject to various risks in addition to those relating to debt securities and foreign investments generally, including, but not limited to, the risk that a governmental entity may be unwilling or unable to pay interest and repay principal on its sovereign debt, or otherwise meet its obligations when due because of cash flow problems, insufficient foreign reserves, the relative size of the debt service burden to the economy as a whole, the government's policy towards principal international lenders such as the International Monetary Fund, or the political considerations to which the government may be subject. If a sovereign debtor defaults (or threatens to default) on its sovereign debt obligations, the indebtedness may be restructured. Some sovereign debtors have in the past been able to restructure their debt payments without the approval of some or all debt holders or to declare moratoria on payments. In the event of a default on sovereign debt, the Fund may also have limited legal recourse against the defaulting government entity.

Emerging Market Countries: The Fund's investments in emerging market countries are subject to all of the risks of foreign investing generally, and have additional heightened risks due to a lack of established legal, political, business and social frameworks to support securities markets, including: delays in settling portfolio securities transactions; currency and capital controls; greater sensitivity to interest rate changes; pervasiveness of corruption and crime; currency exchange rate volatility; and inflation, deflation or currency devaluation.

Floating Rate Corporate Investments: Floating rate corporate loans and corporate debt securities generally have credit ratings below investment grade and may be subject to resale restrictions. They are often issued in connection with highly leveraged transactions, and may be subject to greater credit risks than other investments including the possibility of default or bankruptcy. In addition, a secondary market in corporate loans may be subject to irregular trading activity, wide bid/ask spreads and extended trade settlement periods, which may impair the ability to accurately value existing and prospective investments and to realize in a timely fashion the full value upon the sale of a corporate loan. A significant portion of floating rate investments may be "covenant lite" loans that may contain fewer or less restrictive constraints on the borrower or other borrower-friendly characteristics.

Mortgage Securities and Asset-Backed Securities: Mortgage securities differ from conventional debt securities because principal is paid back periodically over

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the life of the security rather than at maturity. The Fund may receive unscheduled payments of principal due to voluntary prepayments, refinancings or foreclosures on the underlying mortgage loans. Because of prepayments, mortgage securities may be less effective than some other types of debt securities as a means of "locking in" long-term interest rates and may have less potential for capital appreciation during periods of falling interest rates. A reduction in the anticipated rate of principal prepayments, especially during periods of rising interest rates, may increase or extend the effective maturity and duration of mortgage securities, making them more sensitive to interest rate changes, subject to greater price volatility, and more susceptible than some other debt securities to a decline in market value when interest rates rise. Mortgage securities purchased on a delayed delivery or forward commitment basis through the TBA (to-be-announced) market are subject to the risk that the actual securities received by the Fund may be less favorable than anticipated, or that a counterparty will fail to deliver the security.

Issuers of asset-backed securities may have limited ability to enforce the security interest in the underlying assets, and credit enhancements provided to support the securities, if any, may be inadequate to protect investors in the event of default. Like mortgage securities, asset-backed securities are subject to prepayment and extension risks.

Focus: To the extent that the Fund focuses on particular countries, regions, industries, sectors or types of investments from time to time, the Fund may be subject to greater risks of adverse developments in such areas of focus than a fund that invests in a wider variety of countries, regions, industries, sectors or investments.

Derivative Instruments: The performance of derivative instruments depends largely on the performance of an underlying instrument, such as a currency, security, interest rate or index, and such instruments often have risks similar to their underlying instrument, in addition to other risks. Derivative instruments involve costs and can create economic leverage in the Fund's portfolio which may result in significant volatility and cause the Fund to participate in losses (as well as gains) in an amount that exceeds the Fund's initial investment. Other risks include illiquidity, mispricing or improper valuation of the derivative instrument, and imperfect correlation between the value of the derivative and the underlying instrument so that the Fund may not realize the intended benefits. When a derivative is used for hedging, the change in value of the derivative may also not correlate specifically with the currency, security, interest rate, index or other risk being hedged. With over-the-counter derivatives, there is the risk that the other party to the transaction will fail to perform.

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Collateralized Debt Obligations (CDOs): The risks of an investment in a CDO, a type of asset backed security, and which includes CLOs, depend largely on the type of collateral held by the special purpose entity (SPE) and the tranche of the CDO in which the Fund invests and may be affected by the performance of a CDO's collateral manager. CDOs may be deemed to be illiquid and subject to the Fund's restrictions on investments in illiquid investments. In addition to the normal risks associated with debt securities and asset backed securities (e.g., interest rate risk, credit risk and default risk), CDOs carry additional risks including, but not limited to: (i) the possibility that distributions from collateral securities will not be adequate to make interest or other payments; (ii) the quality of the collateral may decline in value or quality or go into default or be downgraded; (iii) the Fund may invest in tranches of a CDO that are subordinate to other classes; and (iv) the complex structure of the security may not be fully understood at the time of investment.

Inflation:The market price of debt securities generally falls as inflation increases because the purchasing power of the future income and repaid principal is expected to be worth less when received by the Fund. Debt securities that pay a fixed rather than variable interest rate are especially vulnerable to inflation risk because variable-rate debt securities may be able to participate, over the long term, in rising interest rates which have historically corresponded with long-term inflationary trends.

Currency Management Strategies: Currency management strategies may substantially change the Fund's exposure to currency exchange rates and could result in losses to the Fund if currencies do not perform as the investment manager expects. In addition, currency management strategies, to the extent that they reduce the Fund's exposure to currency risks, also reduce the Fund's ability to benefit from favorable changes in currency exchange rates. Using currency management strategies for purposes other than hedging further increases the Fund's exposure to foreign investment losses. Currency markets generally are not as regulated as securities markets. In addition, currency rates may fluctuate significantly over short periods of time, and can reduce returns.

Liquidity: The trading market for a particular security or type of security or other investments in which the Fund invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the Fund's ability to sell such securities or other investments when necessary to meet the Fund's liquidity needs, which may arise or increase in response to a specific economic event or because the investment manager wishes to purchase particular investments or believes that a higher level of liquidity would be advantageous. Reduced liquidity will also generally lower the value of such securities or other investments. Market prices for such securities or other investments may be relatively volatile.

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Management: The Fund is subject to management risk because it is an actively managed investment portfolio. The Fund's investment manager applies investment techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee that these decisions will produce the desired results.

Cybersecurity: Cybersecurity incidents, both intentional and unintentional, 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 investment manager, 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 or receiving distributions. The investment manager has 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 or the investment manager. Cybersecurity incidents may result in financial losses to the Fund and its shareholders, and substantial costs may be incurred in an effort to prevent or mitigate 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.

Because technology is frequently changing, new ways to carry out cyber attacks are always developing. Therefore, 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. Like other funds and business enterprises, the Fund, the investment manager, and their service providers are subject to the risk of cyber incidents occurring from time to time.

Performance

The following 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 how the Fund's average annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You can obtain updated performance information at www.franklintempleton.com or by calling (800) DIAL BEN/342-5236.

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

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Class A Annual Total Returns

Best Quarter:

2020, Q2

7.40%

Worst Quarter:

2020, Q1

-9.59%

As of June 30, 2024, the Fund's year-to-date return was 1.23%.

Average Annual Total Returns

(figures reflect sales charges)

For periods ended December 31, 2023

1 Year

5 Years

10 Years

Franklin Strategic Income Fund - Class A

Return before taxes

4.39%

1.27%

1.38%

Return after taxes on distributions

2.42%

-0.45%

-0.30%

Return after taxes on distributions and sale of Fund shares

2.54%

0.24%

0.32%

Franklin Strategic Income Fund - Class C

6.94%

1.63%

1.38%

Franklin Strategic Income Fund - Class R

8.05%

1.77%

1.53%

Franklin Strategic Income Fund - Class R6

8.66%

2.40%

2.16%

Franklin Strategic Income Fund - Advisor Class

8.53%

2.29%

2.03%

Bloomberg US Aggregate Index (index reflects no deduction for fees, expenses or taxes)

5.53%

1.10%

1.81%

The figures in the average annual total returns table above reflect the Class A shares maximum front-end sales charge of 3.75%. Prior to March 1, 2019, Class A shares were subject to a maximum front-end sales charge of 4.25%. If the prior maximum front-end sales charge of 4.25% was reflected, performance for Class A

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shares in the average annual total returns table would be lower for periods prior to March 1, 2019.

No one index is representative of the Fund's portfolio.

The after-tax returns presented in the table 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. After-tax returns 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 are shown only for Class A and after-tax returns for other classes will vary.

Investment Manager

Franklin Advisers, Inc. (Advisers or investment manager)

Portfolio Managers

Sonal Desai, Ph.D.
Executive Vice President and Director of Advisers and portfolio manager of the Fund since 2018.

Patrick Klein, Ph.D.
Senior Vice President of Advisers and portfolio manager of the Fund since 2022.

Patricia O'Connor, CFA
Vice President of Advisers and portfolio manager of the Fund since 2016.

Thomas Runkel, CFA
Vice President of Advisers and portfolio manager of the Fund since 2022.

Benjamin Cryer, CFA
Portfolio Manager of Advisers and portfolio manager of the Fund since 2022.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of the Fund on any business day online through our website at www.franklintempleton.com, by mail (Franklin Templeton Investor Services, P.O. Box 997152, Sacramento, CA 95899-7152), or by telephone at (800) 632-2301. For Class A, C and R, the minimum initial purchase for most accounts is $1,000 (or $25 under an automatic investment plan). Class R6 and Advisor Class are only available to certain qualified investors and the minimum initial investment will vary depending on the type of qualified investor, as described under "Your Account - Choosing a Share Class - Qualified Investors - Class R6" and "- Advisor Class" in the Fund's prospectus. There is no minimum investment for subsequent purchases.

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Taxes

The Fund's distributions are generally taxable to you as ordinary income, capital gains, or some combination of both, unless you are investing through a tax-advantaged arrangement, such as a 401(k) plan or an individual retirement account, in which case your distributions would generally be taxed when withdrawn from the tax-advantaged account.

Payments to Broker-Dealers and Other Financial Intermediaries

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

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Franklin Distributors, LLC

One Franklin Parkway

San Mateo, CA 94403-1906

franklintempleton.com

Franklin Strategic Income Fund

Investment Company Act file #811-06243

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