Summary Prospectus by Investment Company - Form 497K

Investment Goal

This Fund seeks to maximize total return.

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 table and Examples below. The table and Examples below also do not reflect expenses and charges that are imposed under your variable annuity contract or variable life insurance policy. For information on these expenses and charges, please refer to the applicable contract or policy prospectus. If these fees and expenses were included, the fees and expenses shown would be higher.

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

Examples

The Examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other Funds of the Trust or other mutual funds. The Examples assume that you invest $10,000 for the time periods indicated, that your investment has a 5% return each year and that the Fund's annual operating expenses remain as stated in the previous table for the time periods shown. Although your actual costs may be higher or lower, the Examples show what your costs would be based on these assumptions.

These Examples do not reflect fees and expenses of any variable annuity contract or variable life insurance policy. If these were included, the expenses (in dollars) shown would be higher. Keep in mind that this is only an estimate; actual expenses and performance may vary.

Your expenses (in dollars) if you buy, sell/redeem or hold all of your shares at the end of each period

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its holdings). During the fiscal year ended December 31, 2023, the portfolio turnover rate was 27% of the average value of the Fund. A higher portfolio turnover rate reflects a greater number of securities being bought or sold, which may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Examples, affect the Fund's performance.

Principal Investment Strategies

Under normal circumstances, this Fund invests at least 80% of its assets in debt securities. These debt securities will be focused on investment grade intermediate-term debt securities (5 to 10 years to maturity) in order for the Fund to maintain a dollar-weighted average maturity between 3 and 10 years, but may also be invested in long-term debt securities (over 10 years to maturity). These debt securities are comprised of corporate bonds issued by U.S. entities, U.S. treasury obligations and other U.S. government and agency securities, and asset-backed and mortgage-related securities. The Fund may invest a substantial portion of its assets in mortgage-related debt securities in the sub-adviser's discretion.

The Fund may invest up to 15% of its assets in U.S. dollar-denominated debt securities issued by a foreign corporation or a U.S. affiliate of a foreign corporation or a foreign government or its agencies and instrumentalities. The Fund may focus its investments in one country, in one or more regions, or small groups of countries.

The sub-adviser buys and sells securities and investments for the Fund based on its view of individual securities and market sectors.

Taking a long-term approach, the sub-adviser looks for individual fixed income investments that it believes will perform well over a market cycle. The sub-adviser is value oriented and makes decisions to purchase and sell individual securities and instruments after performing a risk/reward analysis that includes an evaluation of interest rate risk, credit risk, duration, liquidity, legal provisions in offering documents (like term to maturity) of the debt security or instrument and the legal structure (such as priority of payments in a multi-class structure) of the debt security.

Principal Risks

As with any mutual fund, the value of the Fund's investments, and therefore the value of your shares, may go up or down and you could lose money. There is no guarantee that the Fund will achieve its investment goal. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Italicized terms refer to separate Principal Risks that are each defined in the Principal Risks section below.

While the Fund may be subject to various risk exposures at any given time depending on market conditions and other factors impacting holdings and investment strategies, the Fund under normal circumstances is subject to the following principal risks:

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Debt Securities Risk: Debt securities and other debt instruments are subject to many risks, including interest rate risk and credit risk, which may affect their value.

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Interest Rate Risk: When interest rates rise, the value of debt investments will generally decrease. The Fund may be subject to heightened levels of interest rate risk because the Federal Reserve has raised, and may continue to raise, interest rates. During periods when interest rates are low or there are negative interest rates, the Fund's yield (and total return) also may be low and the Fund may experience low or negative returns. Debt instruments with longer durations tend to be more sensitive to changes in interest rates, making them more volatile than debt instruments with shorter durations or floating or adjustable interest rates.

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Credit Risk: An issuer or guarantor of a debt instrument might be unable or unwilling to meet its financial obligations and might not make interest or principal payments on an instrument when those payments are due ("default"). The risk of a default is higher for debt instruments that are non-investment grade and lower for debt instruments that are of higher quality. Defaults may potentially reduce the Fund's income or ability to recover amounts due and may reduce the value of the debt instrument, sometimes dramatically.

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Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related and other asset-backed securities are subject to certain risks affecting the housing market or the market for the assets underlying such securities. These securities are also subject to extension risk (the risk that rising interest rates extend the duration of fixed mortgage-related and other asset-backed securities, making them more sensitive to changes in interest rates), interest rate risk (the risk that rising interest rates will cause a decline in the value of a fixed income security), subprime risk (the risk that these securities have exposure to borrowers with lower credit risk, increasing

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potential default), prepayment risk (when interest rates decline, borrowers may pay off their mortgages sooner than expected which can reduce the Fund's returns because the Fund may have to reinvest its assets at lower interest rates), call risk (similar to prepayment risk, an issuer may pay its obligations under a security sooner than expected), U.S. government securities risk (securities backed by different U.S. government agencies are subject to varying levels of credit rating risk), issuer risk (the risk that a private issuer cannot meet its obligations) and stripped mortgage-related securities risk (these securities are particularly sensitive to changes in interest rates).

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U.S. Government Securities Risk: Not all U.S. government securities are backed or guaranteed by the U.S. government and different U.S. government securities are subject to varying degrees of credit risk. There is a risk that the U.S. government will not make timely payments on its debt or provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if those entities are not able to meet their financial obligations.

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Active Management Risk: A portfolio manager's judgments about the potential value or price appreciation of an investment may prove to be incorrect or fail to have the intended results, which could negatively impact the Fund's performance.

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Foreign (Non-U.S.) Markets Risk: Investing in foreign issuers (companies or other entities) can involve more risks than investing in U.S. issuers, such as risks relating to market, economic, political, regulatory and geopolitical conditions relevant to that market. These factors can make investments in foreign issuers more volatile and less liquid than U.S. investments. Less stringent regulatory, accounting, and disclosure requirements and general supervision for issuers and markets are more common in certain foreign countries. Enforcing legal rights can be difficult, costly, and slow in certain foreign countries, and can be particularly difficult against foreign governments. In addition, foreign markets can react differently to these conditions than the U.S. market. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in, or foreign exchange rates with, another market, country or region.

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Geographic Focus Risk: If the Fund invests a significant portion of its assets in a single country, limited number of countries, or particular geographic region, then the risk increases that economic, political, social, or other conditions in those countries or that region will have a significant impact on the Fund's performance. As a result, the Fund's performance may be more volatile than the performance of more geographically diversified funds.

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Underlying Fund Risk: Because the Fund is available for investment by one or more "fund of funds" of the Trust and thus may have a significant percentage of its outstanding shares held by such fund of funds, a change in asset allocation by the fund of funds could result in large redemptions out of the Fund, causing the sale of securities in a short timeframe and

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potential increases in expenses to the Fund and its remaining shareholders, both of which could negatively impact performance.

Performance

The bar chart and Average Annual Total Returns table below provide some indication of the risk of investing in the Fund by showing changes in the performance of the Fund from year to year and showing how the Fund's average annual total returns compare to a broad-based domestic debt market index. The bar chart shows the performance of the Fund's Class P shares. Returns do not reflect fees and expenses of any variable annuity contract or variable life insurance policy; if these fees and expenses were included, the returns shown would be lower. Past performance is not necessarily an indication of how the Fund will perform in the future. Performance reflects fee waivers or expense limitations, if any, that were in effect during the periods presented.

Calendar Year Total Returns (%)

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Best and worst quarterly performance reflected within the bar chart: Q4 2023: 6.57%; Q1 2022: (5.82%)

Management

Investment Adviser - Pacific Life Fund Advisors LLC

Sub-Adviser - J. P. Morgan Investment Management Inc. The persons jointly and primarily responsible for day-to-day management of the Fund are:

Purchase and Sale of Fund Shares

The Fund is offered at net asset value ("NAV") and is available as an underlying investment option for variable life insurance policies and variable annuity contracts ("variable products")

issued by Pacific Life and PL&A. You do not buy, sell or exchange shares of the Fund - you choose investment options through your variable product. The life insurance companies then invest in the Fund if you choose it as an investment option and redeem shares of the Fund if you choose to decrease that investment option. Any minimum initial or subsequent investment requirements and procedures for purchase or redemption of shares of the Fund that apply to your variable product are described in the prospectus for the variable product.

Tax Information

Because the only shareholders of the Fund are the insurance companies offering the variable products and as applicable certain funds of funds of the Trust, no discussion is included here about the federal income tax consequences at the shareholder level. The federal income tax consequences for purchasers of a variable product are described in the prospectus for the variable product.

Payments to Broker-Dealers and Other Financial Intermediaries

Pacific Select Distributors, LLC ("PSD"), the distributor for the Fund and for the variable products, may pay broker-dealers or other financial intermediaries (such as insurance companies) for the sale of the variable products and related services, including shareholder servicing. The Fund's service fee or distribution/​service fee, as applicable, which is paid to PSD, can be used for a part of these payments. These payments may create a conflict of interest by influencing the financial intermediary and your salesperson to recommend the variable product, a share class and/or the Fund over another investment. Ask your salesperson or visit your financial intermediary's website for more information. Class P shares do not pay a service or distribution/service fee to PSD.