Summary Prospectus by Investment Company (Form 497K)

Before you invest, you may want to review the Fund's prospectus and statement of additional information, which contain more information about the Fund and its risks. The current prospectus and statement of additional information, dated January 1, 2026, are incorporated by reference into this summary prospectus. You can find the Fund's prospectus, statement of additional information, reports to shareholders, and other information about the Fund online at www.americanbeaconfunds.com/resource_center/MutualFundForms.aspx. You can also get this information at no cost by calling 1-800-658-5811 or by sending an email request to [email protected].

Investment Objective

The Fund's investment objective is to seek to provide a high level of current income consistent with strong risk-adjusted returns.

Fees and Expenses of the Fund

This 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 discounts if you and your eligible family members invest, or agree to invest in the future, at least $50,000 in all classes of the American Beacon Funds on an aggregated basis. More information about these and other discounts is available from your financial professional and in "Choosing Your Share Class" on page  28 of the Prospectus and "Additional Purchase and Sale Information for A Class Shares" on page  45  of the Statement of Additional Information ("SAI"). With respect to purchases of shares through specific intermediaries, you may find additional information regarding sales charge discounts and waivers in Appendix A to the Fund's Prospectus entitled "Intermediary Sales Charge Discounts, Waivers and Other Information."

Shareholder Fees (fees paid directly from your investment)

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 those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same, except that the Example reflects the fee waiver/expense reimbursement arrangement for each share class through December 31, 2026. C Class shares automatically convert to A Class shares 8 years after purchase, if the conversion is available through your financial intermediary. This Example reflects your costs as though C Class shares were held for the full 10-year period. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

DLFR01012026

American Beacon DoubleLine Floating Rate Income Fund - Summary Prospectus1

Assuming no redemption of shares:

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 217% of the average value of its portfolio.

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in income-producing floating-rate loans, other income-producing floating-rate debt securities and exchange-traded funds ("ETFs") that invest in such instruments.

Floating-rate loans and other floating-rate debt securities (collectively, "floating-rate investments") pay income in the form of interest that is payable at variable (i.e., floating) rates, often on a daily, monthly, quarterly, or semiannual basis by reference to a base lending rate, such as the Secured Overnight Financing Rate ("SOFR"), among others, plus a premium. The Fund considers any security or instrument to be a floating-rate investment if it has a maturity of six months or less even if it pays a rate of interest that does not reset or adjust prior to maturity.

Floating-rate investments include, without limitation, bank loans, including assignments and  participations; floating-rate debt securities; inflation-indexed securities; certain mortgage- and asset-backed securities, and collateralized bond obligations ("CBOs"), collateralized debt obligations ("CDOs"), collateralized loan obligations ("CLOs") and collateralized mortgage obligations ("CMOs"), and real estate mortgage investment conduits ("REMICs"), backed by floating-rate instruments or structured as floating-rate investments and having, in the judgment of DoubleLine Capital LP ("DoubleLine Capital" or the "sub-advisor"), characteristics similar to those of other floating-rate investments; adjustable rate mortgages; floaters; inverse floaters; money market securities of all types; repurchase agreements; debentures, shares of money market and short-term bond funds; and other floating-rate loans of any kind (including, among others, subordinated loans, debtor in possession financings, exit financing facilities, delayed funding loans and revolving credit facilities). The Fund may invest in obligations of any maturity, and to a lesser extent, the Fund may invest in fixed-rate instruments as well. The Fund may invest in foreign investments, including obligations of issuers in emerging markets, without limit. The Fund may invest in floating-rate obligations considered "covenant-lite" based on the types of lender protections and borrower obligations in the loan agreements. To obtain exposure to eligible instruments, the Fund may invest in one or more ETFs that invest in such instruments. A significant portion of the Fund's investments may be unregistered, restricted as to their resale, and may trade in decentralized markets. DoubleLine Capital monitors the duration of the Fund's portfolio securities to seek to assess and, in its discretion, adjust the Fund's exposure to interest rate risk.

A floating-rate loan may be structured and administered by a financial institution that acts as the agent of the lenders participating in the loan. Such loans may be acquired through the agent or from the borrower, as an assignment from another lender who holds a direct interest in the loan, or as a participation interest in another lender's portion of the loan. Floating-rate loans are generally senior in the borrowing companies' capital structures and are typically wholly or partially secured by assets of the borrowing company, although the Fund may also invest in obligations that are unsecured.  

DoubleLine Capital considers a wide variety of factors in purchasing and selling investments for the Fund, including, without limitation, the liquidity of the investment, fundamental analysis of the issuer, the credit quality of the issuer and any collateral securing the investment, the issuer's management, capital structure, leverage, and operational performance, and the business outlook for the industry of the issuer. DoubleLine Capital may also consider available credit ratings in making investment decisions, although the portfolio managers typically perform their own investment analysis and generally do not rely upon the independent credit rating agencies in making investment decisions.

The Fund may invest in securities or instruments of any credit quality. The Fund expects that many or all of the Fund's investments will have below investment-grade credit ratings (commonly referred to as "high yield" or "junk" quality obligations) or may be unrated but deemed by the Sub-Advisor to be of equivalent quality. Credit investments rated below investment grade are generally regarded as having speculative characteristics and entail high risk with respect to the issuer's capacity to pay interest and repay principal. The Fund may hold instruments issued by stressed, distressed, and defaulted issuers, including issuers involved in bankruptcy proceedings, reorganizations, financial  restructurings, rescue financing, or otherwise experiencing financial hardship.

The Fund's investments may include loans issued in an offering that has been oversubscribed, and the Fund may be able to sell such investments at a gain shortly after those investments are made. If the Fund seeks to take advantage of such opportunities, it may lead to higher levels of portfolio turnover, increased transaction costs and greater amounts of taxable distributions to shareholders. There can be no assurance that the Sub-Advisor will be able to identify such opportunities successfully or sell any investments at a gain.  DoubleLine Capital generally sells an investment when it believes its projected future return becomes unattractive relative to the rest of the portfolio or the investable universe, including when the portfolio managers perceive deterioration in the credit fundamentals of the issuer, or when the individual investment has reached the portfolio managers' sell target. Proceeds from the sale of a loan may not be available to the Fund for a substantial period of time after the sale. As a result, it is possible that, during a period of substantial shareholder redemptions, proceeds from sales of loans by the Fund will not be available to the Fund on a timely basis for payment to redeeming shareholders. The Fund might, as a result, incur significant borrowing or other expenses, be forced to sell other securities with shorter settlement periods at unfavorable times or prices, or be forced to delay payment of redemption proceeds beyond the customary period, to the extent permissible under applicable regulations.  

The Fund may invest cash balances in a government money market fund advised by the Manager, with respect to which the Manager receives a management fee. Any such instruments held by the Fund for cash management or defensive investing purposes can fluctuate in value.

Principal Risks

There is no assurance that the Fund will achieve its investment objective and you could lose part or all of your investment in the Fund. The Fund is not designed for investors who need an assured level of current income and is intended to be a long-term investment. The Fund is not a complete investment program and may not be appropriate for all investors. Investors should carefully consider their own investment goals and risk tolerance before investing in the Fund. The principal risks of investing in the Fund listed below are presented in alphabetical order and not in order of importance or potential

2American Beacon DoubleLine Floating Rate Income Fund - Summary Prospectus

exposure. Among other matters, this presentation is intended to facilitate your ability to find particular risks and compare them with the risks of other funds. Each risk summarized below is considered a "principal risk" of investing in the Fund, regardless of the order in which it appears.

Asset-Backed Securities Risk
Investments in asset-backed securities are influenced by factors affecting the assets underlying the securities, including the broader market sector and individual markets, such as the auto markets. These securities may be more sensitive to changes in interest rates than other types of debt securities. Investments in asset-backed securities also are subject to risks of fixed-income securities, which include, but are not limited to, credit risk, interest rate risk, prepayment and extension risk, callable securities risk, valuation risk, liquidity risk, and restricted securities risk. A decline in the credit quality of the issuers of asset-backed securities or instability in the markets for such securities may affect the value and liquidity of such securities, which could result in losses to the Fund. These securities are also subject to the risk of default on the underlying assets, particularly during periods of market downturn, and an unexpectedly high rate of defaults on the underlying assets will adversely affect the security's value.

Asset Selection Risk
Assets selected for the Fund may not perform to expectations. This could result in the Fund's underperformance compared to other funds with similar investment objectives.

Callable Securities Risk
The Fund may invest in fixed-income securities with call features. A call feature allows the issuer of the security to redeem or call the security prior to its stated maturity date. In periods of falling interest rates, issuers may be more likely to call in securities that are paying higher coupon rates than prevailing interest rates. In the event of a call, the Fund would lose the income that would have been earned to maturity on that security, and the proceeds received by the Fund may be invested in securities paying lower coupon rates and may not benefit from any increase in value that might otherwise result from declining interest rates.  

Collateralized Debt Obligations ("CDO") Risk
The risks of an investment in a CDO, including a CBO or CLO, depend largely on the quality and type of the collateral and the tranche of the CDO in which the Fund invests. Normally, collateralized bond obligations, CLOs and other CDOs are privately offered and sold, and thus are not registered under the securities laws. As a result, investments in CDOs maybe illiquid. In addition to the risks associated with debt instruments (e.g., interest rate risk and credit risk), CDOs carry additional risks including, but not limited to: (i) the possibility that distributions from collateral will not be adequate to make interest or other payments; (ii) the quality of the collateral may decline in value or default; (iii) the possibility that the Fund may invest in CDOs that are subordinate to other classes of the issuer's securities; and (iv) the complex structure of the security may not be fully understood at the time of investment and may produce disputes with the issuer or unexpected investment results.

Collateralized Loan Obligations ("CLOs") Risk
The risks of an investment in a CLO depend largely on the type of underlying collateral and the class or seniority of CLO in which the Fund invests. The Fund typically will invest in CLOs collateralized by bank loans.   Therefore, the CLOs in which the Fund invests will be subject to loan interests risk. In addition, CLOs typically are privately offered and sold, and thus, are not registered under the securities laws. As a result, investments in CLOs may be characterized as illiquid securities. The Fund's investments in CLOs and other similarly structured investments may expose the Fund to heightened credit risk, interest rate risk, liquidity risk, market risk, and prepayment and extension risk. In addition to these risks, CLOs may also 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 risk that the quality of the collateral may decline in value or default; (iii) the risk that the Fund may invest in CLOs that are subordinate to other classes; (iv) the risk that the complex structure of the security may not be fully understood at the time of investment and may produce disputes with the issuer or unexpected investment results; and (v) the possibility that the CLO's manager may perform poorly. CLOs may charge management and other administrative fees, which are in addition to those of the Fund. CLOs may be difficult to value and may be highly leveraged, which could make them highly volatile.

Confidential Information Access Risk
In managing the Fund or other client assets, the Manager or Sub-Advisor may be in possession of material non-public information about the issuers of certain investments, including, without limit, loans, high yield bonds and related investments being considered for acquisition by the Fund or held in the Fund's portfolio. Because of prohibitions on trading in securities of issuers while in possession of such information, the Fund might be unable to enter into a transaction in a security of that issuer when it would otherwise be advantageous to do so. In such circumstances, the Fund may be disadvantaged in comparison to other investors, including with respect to the price the Fund pays or receives when it buys or sells an investment. Pursuant to applicable policies and procedures, the Manager or Sub-Advisor may, but is not required to, seek to avoid receipt of confidential information from the issuer so as to avoid possible restrictions on its ability to purchase and sell investments on behalf of the Fund.

Counterparty Risk
The Fund is subject to the risk that a party or participant to a transaction, such as a broker, will be unwilling or unable to satisfy its obligation to make timely principal, interest or settlement payments or to otherwise honor its obligations to the Fund.

"Covenant-Lite" Obligations Risk
Certain investments, such as loans in which the Fund may invest directly or have exposure to through its investments in structured securities, may be "covenant-lite." Covenant-lite obligations contain fewer maintenance covenants than other obligations, or no maintenance covenants at all, and may not include terms which allow the lender to monitor the financial performance of the borrower and declare a default if certain criteria are breached. The Fund's exposure to losses on such investments may be increased, especially during a downturn in the credit cycle.

Credit Risk
The Fund is subject to the risk that the issuer, guarantor or insurer of an obligation, or the counterparty to a transaction, may fail, or become less able or unwilling, to make timely payment of interest or principal or otherwise honor its obligations or default completely. Changes in the actual or perceived creditworthiness of an issuer, or a downgrade or default affecting any of the Fund's securities, could affect the Fund's performance. Generally, the longer the maturity and the lower the credit quality of a security, the more sensitive it is to credit risk.

Currency Risk
The Fund may have exposure to foreign currencies. Foreign currencies may fluctuate significantly over short periods of time, may be affected unpredictably by intervention, or the failure to intervene, of the  U.S. or foreign governments or central banks, and may be affected by currency controls or political developments in the U.S. or abroad. Foreign currencies may also decline in value relative to the U.S. dollar and other currencies and thereby affect the Fund's investments.

Cybersecurity and Operational Risk
Operational risks arising from, among other problems, human errors, systems and technology disruptions or failures, or cybersecurity incidents may negatively impact the Fund, its service providers and third-party fund distribution platforms, including the ability of shareholders to transact in the Fund's shares, and result in financial losses. Cybersecurity incidents may allow an unauthorized party to gain access to Fund assets, shareholder data, or proprietary information, or cause the Fund or its service providers, as well as securities trading venues and their service providers, to suffer data corruption or lose operational functionality. Cybersecurity incidents can result from deliberate attacks or unintentional events. It is not possible for the Fund or its service providers to identify all of the operational risks that may affect the Fund or to develop processes and controls to completely eliminate or mitigate their occurrence or effects. The Fund cannot

American Beacon DoubleLine Floating Rate Income Fund - Summary Prospectus3

control the cybersecurity and operational plans and systems of its service providers, its counterparties or the issuers of securities in which the Fund invests. The issuers of the Fund's investments are likely to be dependent on computers for their operations and require ready access to their data and the internet to conduct their business. Thus, cybersecurity incidents could also affect issuers of the Fund's investments, leading to significant loss of value.

Debentures Risk
Debentures are unsecured debt securities. The holder of a debenture is protected only by the general creditworthiness of the issuer. The Fund may invest in both corporate and government debentures.  

Debtor-in-Possession ("DIP") Financing, Rescue Financing, and Exit Financing Risk
The Fund may invest in obligations of companies that have filed for protection under Chapter 11 of the United States Bankruptcy Code. DIP financings allow the entity to continue its business operations while reorganizing under Chapter 11, and such financings must be approved by the bankruptcy court. DIP financings are typically fully secured by a lien on the debtor's otherwise unencumbered assets or secured by a junior lien on the debtor's encumbered assets (so long as the obligation is fully secured based on the most recent current valuation or appraisal report of the debtor). There is a risk that the borrower will not emerge from Chapter 11 bankruptcy proceedings and be forced to liquidate its assets under Chapter 7 of the U.S. Bankruptcy Code. In the event of liquidation, the Fund's only recourse will be against the property securing the DIP financing.

The Fund may invest in exit financing, also known as an exit facility, which is the financing provided to companies that have filed for protection under Chapter 11 of the United States Bankruptcy Code to allow them to emerge from bankruptcy. The Fund may also invest in obligations of companies receiving rescue financing to address liquidity shortfalls, temporary operational problems, pending debt maturities or over-leveraged balance sheets. These financial difficulties may never be overcome and may lead to uncertain outcomes, including causing such issuer to become subject to bankruptcy proceedings.  

Defaulted Securities Risk
There is a significant risk related to the uncertainty of repayment of defaulted securities (e.g., a security on which a principal or interest payment is not made when due) and obligations of distressed issuers (including insolvent issuers or issuers in payment or covenant default, in workout or restructuring or in bankruptcy or similar proceedings). Such investments entail high risk and have speculative characteristics.  

Delayed Funding Loans and Revolving Credit Facilities Risk
The Fund's investments in delayed funding loans and revolving credit facilities are subject to credit risk, interest rate risk, liquidity risk and loan interests risk. There may be circumstances in which the borrower's credit risk may be deteriorating and yet the Fund may be obligated to make loans to the borrower as the borrower's credit continues to deteriorate, including at a time when the borrower's financial condition makes it unlikely that such amounts will be repaid.

Emerging Markets Risk
When investing in emerging markets, the risks of investing in foreign securities are heightened. Emerging markets are generally smaller, less developed, less liquid and more volatile than the securities markets of the U.S. and other developed markets. There are also risks of: greater political or economic uncertainties; an economy's dependence on revenues from particular commodities or on international aid or development assistance; currency transfer restrictions; a limited number of potential buyers for such securities resulting in increased volatility and limited liquidity for emerging market securities; trading suspensions and other restrictions on investment; delays and disruptions in securities clearing and settlement procedures; and significant limitations on investor rights and recourse. The governments of emerging market countries may also be more unstable and more likely to impose capital controls, nationalize a company or industry, place restrictions on foreign ownership and on withdrawing sale proceeds of securities from the country, intervene in the financial markets, and/or impose burdensome taxes that could adversely affect security prices. In addition, there may be less publicly available information about issuers in emerging markets than would be available about issuers in more developed capital markets, and such issuers may not be subject to accounting, auditing, financial reporting and recordkeeping standards and requirements comparable to those to which U.S. companies are subject.

Foreign Investing Risk
Non-U.S. investments carry potential risks not associated with U.S. investments. Such risks may include, but are not limited to: (1) currency exchange rate fluctuations, (2) political and financial instability, (3) less liquidity, (4) lack of uniform accounting, auditing, recordkeeping and financial reporting standards, (5) greater volatility, (6) different government regulation and supervision of foreign stock exchanges, brokers and listed companies, and (7) delays or failures in transaction payment and settlement in some foreign markets. Additionally, trading in foreign markets generally involves higher transaction costs than trading in U.S. markets. The Fund's investment in a foreign issuer may subject the Fund to regulatory, political, currency, security, economic and other risks associated with that country, including tariffs, trade disputes and sanctions. Global economic and financial markets have become increasingly interconnected and conditions (including recent volatility, terrorism, war and political instability) and events (including natural disasters) in one country, region or financial market may adversely impact issuers in a different country, region or financial market.

High Portfolio Turnover Risk
Portfolio turnover is a measure of the Fund's trading activity over a one-year period. A portfolio turnover rate of 100% would indicate that the Fund sold and replaced the entire value of its securities holdings during the period. The Fund may engage in active and frequent trading and may have a high portfolio turnover rate, which could increase the Fund's transaction costs, have a negative impact on performance, and generate higher capital gain distributions to shareholders than if the Fund had a lower portfolio turnover rate.

High-Yield Securities Risk
Exposure to high-yield, below investment-grade securities (commonly referred to as "junk bonds") generally involves significantly greater risks than an investment in investment grade securities. High-yield debt securities may fluctuate more widely in price and yield and may fall in price when the economy is weak or expected to become weak. These securities also may be difficult to sell at the time and price the Fund desires. High-yield securities are considered to be speculative with respect to an issuer's ability to pay interest and principal and carry a greater risk that the issuers of lower-rated securities will default on the timely payment of principal and interest. High-yield securities may experience greater price volatility and less liquidity than investment grade securities. Issuers of securities that are in default or have defaulted may fail to resume principal or interest payments, in which case the Fund may lose its entire investment.

Inflation Index-Linked Securities Risk
Unlike a conventional bond, whose issuer makes regular fixed interest payments and repays the face value of the bond at maturity, an inflation index-linked security provides principal payments and interest payments that vary as the principal and/or interest are adjusted over time to reflect a rise or a drop in the reference inflation-related index. For inflation index-linked debt securities for which repayment of the original principal upon maturity (as adjusted for inflation) is not guaranteed, the adjusted principal value of the securities repaid at maturity may be less than the original principal value. The value of inflation index-linked securities is expected to change in response to real interest rates, which are in turn tied to the relationship between nominal interest rates and the rate of inflation. There can be no assurance that an inflation index that is used will accurately measure the real rate of inflation. The price of an inflation index-linked security generally falls when real interest rates rise and rises when real interest rates fall. Interest payments on such securities are unpredictable and will fluctuate as the principal and interest are adjusted to reflect movements in the inflation-related index. In periods of deflation, the Fund may have no income at all from such investments. The principal value of an investment in the Fund is not protected or otherwise guaranteed by the value of the Fund's investments in inflation index-linked securities.

4American Beacon DoubleLine Floating Rate Income Fund - Summary Prospectus

Interest Rate Risk
Generally, the value of investments with interest rate risk, such as fixed-income securities, will move in the opposite direction as movements in interest rates. Factors including central bank monetary policy, rising inflation rates, and changes in general economic conditions may cause interest rates to rise, which could cause the value of the Fund's investments to decline. Interest rate increases, including significant or rapid increases, may result in a decline in the value of bonds held by the Fund, make issuers less willing or able to make principal and interest payments on fixed-income investments when due, lead to heightened volatility in the fixed-income markets and adversely affect the liquidity of certain fixed-income investments, any of which may result in substantial losses to the Fund. When interest rates decline, issuers may prepay higher-yielding securities held by the Fund, resulting in the Fund reinvesting in securities with lower yields, which may cause a decline in its income.   Interest rate changes may have a more pronounced effect on the market value of fixed-rate instruments than on floating-rate instruments. The value of floating rate and variable securities may decline if their interest rates do not rise as quickly, or as much, as general interest rates.  The prices of fixed-income securities are also affected by their durations. Fixed-income securities with longer durations generally have greater sensitivity to changes in interest rates than those with shorter durations. Rising interest rates may cause the value of the Fund's investments with longer durations and terms to maturity to decline, which may adversely affect the value of the Fund. For example, if a bond has a duration of two years, a 1% increase in interest rates could be expected to result in a 2% decrease in the value of the bond. Fluctuations in interest rates may also affect the liquidity of fixed income securities and instruments held by the Fund.

Investment Risk
An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. When you sell your shares of the Fund, they could be worth less than what you paid for them. Therefore, you may lose money by investing in the Fund.

Issuer Risk
The value of, and/or the return generated by, a security may decline for a number of reasons that directly relate to the issuer, such as management performance, financial leverage and reduced demand for the issuer's goods or services, as well as the historical and prospective earnings of the issuer and the value of its assets.

Liquidity Risk
The Fund is susceptible to the risk that certain investments held by the Fund may have limited marketability, be subject to restrictions on sale, be difficult or impossible to purchase or sell at favorable times or prices or become less liquid in response to market developments or adverse credit events that may affect issuers or guarantors of a security. An inability to sell a portfolio position can adversely affect the Fund's value or prevent the Fund from being able to take advantage of other investment opportunities. Market prices for such instruments may be volatile. During periods of substantial market volatility, an investment or even an entire market segment may become illiquid, sometimes abruptly, which can adversely affect the Fund's ability to limit losses. The Fund could lose money if it is unable to dispose of an investment at a time that is most beneficial to the Fund. The Fund may be required to dispose of investments at unfavorable times or prices to satisfy obligations, which may result in losses or may be costly to the Fund. Unexpected redemptions may force the Fund to sell certain investments at unfavorable prices to meet redemption requests or other cash needs.  Judgment plays a greater role in pricing illiquid investments than in investments with more active markets.

Litigation, Bankruptcy, and Other Proceedings Risk
Investments in stressed, distressed or bankrupt companies include a material risk of involving the Fund in a related litigation. Such litigation can be time consuming and expensive, and can frequently lead to unpredicted delays or losses. Litigation expenses, including payments pursuant to settlements or judgments, generally will be borne by the Fund. A bankruptcy filing may have adverse and permanent effects on a company. Further, if the proceeding is converted to a liquidation, the liquidation value of the company may not equal the liquidation value that was believed to exist at the time of the investment. In addition, a creditor's return on investment can be impacted adversely by delays while a plan of reorganization is being negotiated, approved by the creditors, confirmed by the bankruptcy court (if applicable), and becomes effective. Certain fixed-income securities invested in by the Fund could be subject to U.S. federal, state or non-U.S. bankruptcy laws or fraudulent transfer or conveyance laws if such securities were issued with the intent of hindering, delaying or defrauding creditors or, in certain circumstances, if the issuer receives less than reasonably equivalent value or fair consideration in return for issuing such securities. If the Fund, the Manager or the Sub-Advisor were to be found to have interfered with the affairs of a company in which the Fund holds a debt investment, to the detriment of other creditors or common stockholders of such company, the Fund could be held liable for damages to injured parties or a bankruptcy court. Changes in bankruptcy laws (including U.S. federal and state laws and applicable non-U.S. laws) may adversely impact the Fund's securities.

Loan Interests Risk
In making investments in bank loans or senior loans, the Fund will depend primarily on the creditworthiness of the borrower for payment of principal and interest and will also rely on the financial institution to make principal and interest payments to the Fund once it receives payment on the underlying loan. The Fund will also rely on the financial institution to pursue appropriate remedies against a borrower in the event that the borrower defaults. As such, the Fund may be exposed to the credit risk of both the financial institution that made the loan and the underlying borrower.

Unlike publicly traded common stocks, which trade on national exchanges, there is no central place or exchange for loans, including bank loans and senior loans, to trade. There is a risk that the value of any collateral securing a loan in which the Fund has an interest may decline and that the collateral may not be sufficient to cover the amount owed on the loan. In the event that the borrower defaults, the Fund's access to the collateral may be limited or delayed by bankruptcy or other insolvency laws. Loans trade in an over-the-counter market, and confirmation and settlement, which are effected through standardized procedures and documentation, may take significantly longer than seven days to complete. Extended trade settlement periods may, in unusual market conditions with a high volume of shareholder redemptions, present a risk to shareholders with respect to the Fund's ability to pay redemption proceeds within the allowable time periods stated in the Prospectus. The secondary market for loans also may be subject to irregular trading activity and wide bid/ask spreads. The lack of an active trading market for certain loans may impair the ability of the Fund to sell its loan interests at a time when it may otherwise be desirable to do so or may require the Fund to sell them at prices that are less than what the Fund regards as their fair market value and may make it difficult to value such loans. Accordingly, loan interests may at times be illiquid. Interests in loans made to finance highly leveraged companies or transactions, such as corporate acquisitions, may be especially vulnerable to adverse changes in economic or market conditions.

Market Risk
The Fund is subject to the risk that the securities markets will move down, sometimes rapidly and unpredictably, based on overall economic conditions and other factors, which may negatively affect the Fund's performance. The financial markets generally move in cycles, with periods of rising prices followed by periods of declining prices. The value of your investment may reflect these fluctuations. During a general downturn in the securities markets, multiple asset classes may decline in value simultaneously. Even when certain securities prices have generally increased over time, there have been periods of price decreases during those times, resulting in losses for investors, which are likely to occur again in the future.

Geopolitical and other events, including war, terrorism, trade disputes, pandemics, public health crises, natural disasters, and  cybersecurity incidents, have led, and in the future may continue to lead, to general instability in world economies and markets and reduced liquidity in securities, which may negatively affect the value of your investment.

American Beacon DoubleLine Floating Rate Income Fund - Summary Prospectus5

Policies established by the  U.S. government and/or Federal Reserve and economic and political circumstances within the U.S. and abroad, such as inflation, changes in interest rates, recessions, changes in government leadership, a government's inability to agree on a budget, high public debt, the threat or occurrence of a federal government shutdown and threats or the occurrence of a failure to increase the federal government's debt limit, which could result in a default on the government's obligations, may negatively affect investor and consumer confidence and may negatively impact financial markets and the broader economy, perhaps suddenly and to a significant degree.

Markets and market participants are increasingly reliant upon public and proprietary data and systems. Data or technology malfunctions and inaccuracies may disrupt markets and lead to negative consequences for market participants like the Fund.  

Market Timing Risk
The Fund is subject to the risk of market timing activities by investors due to the nature of the Fund's investments, which requires the Fund, in certain instances, to fair value certain of its investments. Some investors may engage in frequent short-term trading in the Fund to take advantage of any price differentials that may be reflected in the net asset value ("NAV") of the Fund's shares. Frequent trading by Fund shareholders poses risks to other shareholders in the Fund, including (i) the dilution of the Fund's NAV, (ii) an increase in the Fund's expenses, and (iii) interference with the ability to execute efficient investment strategies.

Mortgage-Backed and  Mortgage-Related Securities Risk
Investments in mortgage-backed and mortgage-related securities are influenced by the factors affecting the mortgages underlying the securities or the housing market. These securities tend to be more sensitive to changes in interest rates than other types of debt securities. Investments in mortgage-backed and mortgage-related securities also are subject to market risks for fixed-income securities, which include, but are not limited to, credit risk, interest rate risk, prepayment and extension risk, callable securities risk, valuation risk, liquidity risk, and restricted securities risk. A decline in the credit quality of the issuers of mortgage-backed and mortgage-related securities or instability in the markets for such securities may affect the value and liquidity of such securities, which could result in losses to the Fund. These securities are also subject to the risk of default on the underlying mortgages, particularly during periods of market downturn, and an unexpectedly high rate of defaults on the underlying assets will adversely affect the security's value.

Other Investment Companies Risk
To the extent that the Fund invests in shares of other registered investment companies, the Fund will indirectly bear the fees and expenses charged by those investment companies in addition to the Fund's direct fees and expenses. To the extent the Fund invests in other investment companies that invest in equity securities, fixed-income securities and/or foreign securities, or that track an index, the Fund is subject to the risks associated with the underlying investments held by the investment company or the index fluctuations to which the investment company is subject. The Fund will be subject to the risks associated with investments in those companies, including but not limited to the following:

6American Beacon DoubleLine Floating Rate Income Fund - Summary Prospectus

Prepayment and Extension Risk
Prepayment and extension risk is the risk that a bond or other fixed-income security or investment might, in the case of prepayment risk, be called or otherwise converted, prepaid or redeemed before maturity and, in the case of extension risk, that the investment might not be prepaid as expected. Due to a decline in interest rates or excess cash flow into the issuer, a debt security may be called or otherwise converted, prepaid or redeemed before maturity. If this occurs, no additional interest will be paid on the investment. The Fund may have to reinvest the proceeds in another investment at a lower rate, may not benefit from an increase in value that may result from declining interest rates, and may lose any premium it paid to acquire the security, any of which could result in a reduced yield to the Fund. The rate of prepayments tends to increase as interest rates fall, which could cause the average maturity of the portfolio to shorten. Conversely, extension risk is the risk that a decrease in prepayments may, as a result of higher interest rates or other factors, result in the extension of a security's effective maturity, increase the risk of default or delayed payment, heighten interest rate risk and increase the potential for a decline in an investment's price. In addition, as a consequence of a decrease in prepayments, the amount of principal available to the Fund for investment would be reduced. Extensions of obligations could cause the Fund to exhibit additional volatility and hold securities paying lower-than-market rates of interest. Either case could hurt the Fund's performance.

Redemption Risk
The Fund may experience periods of high levels of redemptions that could cause the Fund to sell assets at inopportune times or at a loss or depressed value. Heavy redemptions could hurt the Fund's performance. The sale of assets to meet redemption requests may create net capital gains, which could cause the Fund to have to distribute substantial capital gains. Redemption risk is greater to the extent that one or more investors or intermediaries control a large percentage of investments in the Fund. In addition, redemption risk is heightened during periods of declining or illiquid markets. A rise in interest rates or other market developments may cause investors to move out of fixed-income securities on a large scale. During periods of heavy redemptions, the Fund may borrow funds through the interfund credit facility or from a bank line of credit, which may increase costs.

Reliance on Corporate Management and Financial Reporting  Risk
The Sub-Advisor may select investments for the Fund in part on the basis of information and data made directly available to the Sub-Advisor by the issuers of securities or through sources other than the issuers such as collateral pool servicers. The Sub-Advisor has no ability to independently verify such information and data and is therefore dependent upon the integrity of the management of these issuers and of such servicers and the financial and collateral performance reporting processes in general. Information and data provided regarding a particular issuer may not necessarily contain information that the Sub-Advisor normally considers when evaluating the investment prospects of a company.

Repurchase Agreement Risk
The use of repurchase agreements involves counterparty risk and credit risk. The obligations of a counterparty to a repurchase agreement are not guaranteed. The Fund permits various forms of securities as collateral whose values fluctuate and that are not issued or guaranteed by the U.S. government. There are risks that a counterparty may default at a time when the collateral has declined in value, or a counterparty may become insolvent and subject to liquidation, which may affect the Fund's right to control the collateral.

Restricted Securities Risk
Securities not registered in the U.S. under the Securities Act of 1933, as amended (the "Securities Act"), or in non-U.S. markets pursuant to similar regulations, including "Section 4(a)(2)" securities and "Rule 144A" securities, are restricted as to their resale. Such securities may not be listed on an exchange and may have no active trading market. The prices of these securities may be more difficult to determine than publicly traded securities and these securities may involve heightened risk as compared to investments in securities of publicly traded companies. They may be more difficult to purchase or sell at an advantageous time or price because such securities may not be readily marketable in broad public markets or may have to be held for a certain time period before they can be resold. The Fund may not be able to sell a restricted security when the sub-advisor considers it desirable to do so and/or may have to sell the security at a lower price than the Fund believes is its fair market value. In addition, transaction costs may be higher for restricted securities and the Fund may receive only limited information regarding the issuer of a restricted security. The Fund may have to bear the expense of registering restricted securities for resale and the risk of substantial delays in effecting the registration.

Secured, Partially Secured and Unsecured Obligation Risk
Debt obligations may be secured, partially secured or unsecured. Interests in secured and partially-secured obligations have the benefit of collateral and, typically, of restrictive covenants limiting the ability of the borrower to further encumber its assets. However, there is no assurance that the liquidation of collateral from a secured or partially-secured obligation would satisfy the borrower's obligation, or that the collateral can be liquidated. Furthermore, there is a risk that the value of any collateral securing an obligation in which the Fund has an interest may decline and that the collateral may not be sufficient to cover the amount owed on the obligation. In the event the borrower defaults, the Fund's access to the collateral may be limited or delayed by bankruptcy or other insolvency laws. Unsecured debt, including senior unsecured and subordinated debt, will not be secured by any collateral and will be effectively subordinated to a borrower's secured indebtedness (to the extent of the collateral securing such indebtedness). With respect to unsecured obligations, the Fund lacks any collateral on which to foreclose to satisfy its claim in whole or in part. Such instruments generally have greater price volatility than that of fully secured holdings and may be less liquid.

Securities Selection Risk
Securities selected for the Fund may not perform to expectations. This could result in the Fund's underperformance compared to its performance index(es), or other funds with similar investment objectives or strategies.

Stressed, Distressed, and Defaulted Securities Risk
The Fund may invest in the debt securities of financially stressed or distressed issuers, including those that are in default or the issuers of which are in bankruptcy. Investments in the securities of financially stressed or distressed issuers are speculative and involve substantial risks. These securities may present a substantial risk of default or may be in default at the time of investment. In addition, these securities may fluctuate more in price, and are typically less liquid than other higher-rated debt securities. The Fund may incur additional expenses to the extent it is required to seek recovery upon a default in the payment of principal or interest on its portfolio holdings. The Fund is also subject to significant uncertainty as to when, and in what manner, and for what value obligations evidenced by securities of financially stressed or distressed issuers will eventually be satisfied (e.g., through a liquidation of the issuer's assets, an exchange offer or plan of reorganization, or a payment of some amount in satisfaction of the obligation). Defaulted obligations might be repaid only after lengthy workout or bankruptcy proceedings, during which the issuer might not make any interest or other payments. In any such proceeding relating to a defaulted obligation, the Fund may lose its entire investment or may be required to accept cash or securities with a value substantially less than its original investment. Among the risks inherent in investments in a troubled issuer is that it frequently may be difficult to obtain information as to the true financial condition of the issuer.

The level of analytical sophistication, both financial and legal, necessary for successful investment in stressed or distressed assets is particularly high. There is no assurance that the Fund will correctly evaluate the value of the assets collateralizing the Fund's investments or the prospects for a successful reorganization or similar action in respect of any company. In any reorganization or liquidation proceeding relating to a company in which the Fund invests, the Fund may lose its entire investment, may be required to accept cash or securities with a value less than the Fund's original investment and/or may be required to accept payment over an extended period of time.

American Beacon DoubleLine Floating Rate Income Fund - Summary Prospectus7

Structured Products and Structured Notes Risk
The risk that an investment in a structured product, which includes, among other things, collateralized debt obligations, mortgage-backed securities, other types of asset-backed securities and certain types of structured notes, may decline in value due to changes in the underlying instruments, indexes, interest rates or other factors on which the product is based ("reference measure"). Depending on the reference measure used and the use of multipliers or deflators (if any), changes in interest rates and movement of the reference measure may cause significant price and cash flow fluctuations. Application of a multiplier is comparable to the use of financial leverage, a speculative technique. Holders of structured products indirectly bear risks associated with the reference measure, are subject to counterparty risk and typically do not have direct rights against the reference measure. Structured products are generally privately offered and sold, and thus, are not registered under the securities laws and may be thinly traded or have a limited trading market and may have the effect of increasing the Fund's illiquidity, reducing the Fund's income and the value of the investment. At a particular point in time, the Fund may be unable to find qualified buyers for these securities. Investments in structured notes involve risks including interest rate risk, credit risk and market risk.

Unrated Securities Risk
Because the Fund may purchase securities that are not rated by any rating organization,  the Sub-Advisor, after assessing their credit quality, may internally assign ratings to certain of those securities in categories similar to those of rating organizations. Unrated securities are subject to the risk that the Sub-Advisor may not accurately evaluate the security's comparative credit rating. Some unrated securities may not have an active trading market or may be difficult to value, which means the Fund might have difficulty selling them promptly at an acceptable price. Unrated securities may be subject to greater liquidity risk and price volatility.

U.S. Government Securities and Government-Sponsored Enterprises Risk
A security backed by the U.S. Treasury or the full faith and credit of the United States is guaranteed only as to the timely payment of coupons and the face value at maturity, not its current market price. The market prices for such securities are not guaranteed and will fluctuate. Certain securities held by the Fund that are issued by government-sponsored enterprises, such as the Federal National Mortgage Association (''Fannie Mae''), Federal Home Loan Mortgage Corporation (''Freddie Mac''), Federal Home Loan Bank (''FHLB''), and Federal Farm Credit Bank ("FFCB"), are not guaranteed by the U.S. Treasury and are not backed by the full faith and credit of the U.S. government, and no assurance can be given that the U.S. government will provide financial support if these organizations do not have the funds to meet future payment obligations. U.S. government securities and securities of government-sponsored enterprises are also subject to credit risk, interest rate risk and market risk. The rising U.S. national debt may lead to adverse impacts on the value of U.S. government securities due to potentially higher costs for the U.S. government to obtain new financing. It is possible that the U.S. government and government-sponsored enterprises will not have the funds to meet their payment obligations in the future.

Valuation Risk
Certain of the Fund's assets may be valued at a price different from the price at which they can be sold. This risk may be especially pronounced for investments that are illiquid or may become illiquid, or securities that trade in relatively thin markets and/or markets that experience extreme volatility. The valuation of the Fund's investments in an accurate and timely manner may be impacted by technological issues and/or errors by third party service providers, such as pricing services or accounting agents.

Variable and Floating Rate Securities Risk
The coupons on variable and floating-rate securities are not fixed and may fluctuate based upon changes in market rates. A variable rate security has a coupon that is adjusted at pre-designated periods in response to changes in the market rate of interest on which the coupon is based. The coupon on a floating rate security is generally based on an interest rate, such as a money-market index, Secured Overnight Financing Rate ("SOFR"), or a Treasury bill rate. Variable and floating rate securities are subject to interest rate risk and credit risk. As short-term interest rates decline, the coupons on variable and floating-rate securities typically decrease. Alternatively, during periods of rising short-term interest rates, the coupons on variable and floating-rate securities typically increase. Changes in the coupons of variable and floating-rate securities may lag behind changes in market rates or may have limits on the maximum increases in the coupon rates. The value of variable and floating-rate securities may decline if their coupons do not rise as much, or as quickly, as interest rates in general. Conversely, variable and floating rate securities will not generally increase in value if interest rates decline. Certain types of variable and floating rate instruments may be subject to greater liquidity risk than other debt securities.

Fund Performance

The bar chart and table below provide an indication of risk by showing changes in the Fund's performance over time. The bar chart shows how the Fund's performance has varied from year to year. The table shows how the Fund's average annual total returns compare to a broad-based securities market index, as well as an additional market index with characteristics that are similar to those of the Fund, for the periods indicated. The current sub-advisor began managing the Fund on June 21, 2025. Performance through June 20, 2025 reflects the Fund's performance under the management of the sub-advisors that managed the Fund from (i) December 11, 2015 through December 30, 2022, and (ii) December 31, 2022 through June 20, 2025, respectively.

On December 11, 2015, the Fund acquired all the assets and assumed all the liabilities of the Fund's predecessor. The R5 Class shares of the Fund have adopted the performance history and financial statements of the Institutional Class shares of the Fund's predecessor.

In the bar chart and table below, as applicable, for the period prior to December 11, 2015, the performance of the Fund's R5 Class, Investor Class, A Class, C Class and Y Class shares reflects the returns of the Institutional Class shares of the Fund's predecessor. The newer share classes would have had similar annual returns to the Institutional Class shares of the Fund's predecessor because the shares of each class represent investments in the same portfolio securities. However, the Institutional Class shares of the Fund's predecessor had different expenses than the newer share classes, which would affect performance. To the extent that the Institutional Class shares of the Fund's predecessor had lower expenses than the newer share classes, the performance of the Institutional Class shares of the Fund's predecessor would likely have been higher than the newer share class would have realized during the same period. The R5 Class, Investor Class, A Class, C Class, and Y Class performance shown in the table has not been adjusted for differences in operating expenses between those share classes and the Institutional Class shares of the Fund's predecessor, but the A Class and C Class shares performance has been adjusted for the impact of the maximum applicable sales charge.

C Class shares automatically convert to A Class shares 8 years after purchase, if the conversion is available through your financial intermediary. In the table below, the performance for C Class shares reflects the performance as though C Class shares were held for the full 10-year period. You may obtain updated performance information on the Fund's website at www.americanbeaconfunds.com. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

8American Beacon DoubleLine Floating Rate Income Fund - Summary Prospectus

Average annual total returns for periods ended December 31, 2024

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local income taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. The return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period. If you are a tax-exempt entity or hold your Fund shares through a tax-deferred arrangement, such as an  individual retirement account ("IRA") or a 401(k) plan, the after-tax returns do not apply to your situation. After-tax returns are shown only for R5 Class shares of the Fund; after-tax returns for other share classes will vary.

Management

The Manager
The Fund has retained American Beacon Advisors, Inc. to serve as its Manager.

Sub-Advisor
The Fund's investment sub-advisor is DoubleLine Capital LP.

Portfolio Managers

Purchase and Sale of Fund Shares

You may buy or sell shares of the Fund through a retirement plan, an investment professional, a broker-dealer, or other financial intermediary. You may purchase or redeem shares of the Fund on any day the New York Stock Exchange ("NYSE") is open, at the Fund's net asset value ("NAV") per share next calculated after your order is received in proper form, subject to any applicable sales charge. The Manager may, in its sole discretion, allow certain individuals to invest directly in the Fund. For more information regarding eligibility to invest directly please see "About Your Investment - Purchase and Redemption of Shares." Direct mutual fund account shareholders may buy subsequent shares or sell shares in various ways:

American Beacon DoubleLine Floating Rate Income Fund - Summary Prospectus9

Tax Information

Dividends, capital gains distributions, and other distributions, if any,  that you receive as a result of your investment in the Fund are subject to federal income tax and may also be subject to state and local income taxes, unless you are a tax-exempt entity or your account is  tax-deferred,  such as an individual retirement account ("IRA") or a 401(k) plan (in which case you may be taxed later, upon the withdrawal of your investment from such account or plan).

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 the Fund's distributor, Resolute Investment Distributors, Inc., or the Manager 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 individual financial professional to recommend the Fund over another investment. Ask your individual financial professional or visit your financial intermediary's website for more information.

10American Beacon DoubleLine Floating Rate Income Fund - Summary Prospectus