Summary Prospectus by Investment Company - Form 497K

Investment Goal

This Fund seeks a high level of current income.

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 108% 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

This Fund invests principally in income producing floating rate loans and floating rate debt securities. Under normal circumstances, this Fund invests at least 80% of its assets in floating rate loans and floating rate debt securities. Floating rate loans and floating rate debt securities are those with interest rates which float, adjust or vary periodically based upon a benchmark indicator, a specified adjustment schedule or prevailing interest rates. Floating rate loans and floating rate debt securities in which the Fund invests consist of senior secured and unsecured floating rate loans, secured and unsecured second lien floating rate loans, and floating rate debt securities of domestic and foreign issuers. Senior floating rate loans and some floating rate debt securities are debt instruments that may have a right to payment that is senior to most other debts of the borrowers. Second lien loans are generally second in line in terms of repayment priority with respect to the pledged collateral. Borrowers may include corporations, partnerships and other entities that operate in a variety of industries and geographic regions. Generally, secured floating rate loans are secured by specific assets of the borrower.

Floating rate loans will generally be purchased from banks or other financial institutions through assignments or participations. A direct interest in a floating rate loan may be acquired directly from the agent of the lender or another lender by assignment or an indirect interest may be acquired as a participation in another lender's portion of a floating rate loan.

The Fund is expected to invest substantially all of its assets in floating rate loans and other debt instruments that are rated non-investment grade or, if unrated, are of comparable quality as determined by the sub-adviser. The Fund may invest up to 20% of its assets in other types of debt instruments or securities including non-investment grade (high yield/high risk, sometimes called "junk bonds") debt instruments.

The Fund may invest up to 25% of its assets in U.S. dollar-denominated foreign investments, principally in developed markets.

The sub-adviser normally invests the Fund's assets across different groups of industries/sectors, but may invest a significant percentage of the Fund's assets in issuers in a single sector at its investment discretion in seeking the investment goal of the Fund. As of December 31, 2023, a significant portion of the Fund is represented by securities of companies in the Industrial sector.

Fundamental Research Process. Individual investment selection is based on the sub-adviser's fundamental research process. The sub-adviser's fundamental research process combines a bottom-up issuer analysis and top-down market assessment. A bottom-up issuer analysis relies upon the sub-adviser's fundamental research analysis of individual issuers. A top-down market assessment provides a framework for portfolio risk positioning and sector allocations. Once this is determined, the sub-adviser looks for companies that it believes have sustainable competitive positions, strong management teams and the ability to repay or refinance its debt obligations. The sub-adviser performs a credit analysis on each potential issuer and a relative value analysis for each potential investment. When selecting investments, the sub-adviser may invest in instruments that it believes have the potential for capital appreciation.

An investment is generally sold when the issue has realized its price appreciation target, the issue no longer offers relative value, or an adverse change in corporate or sector fundamentals has occurred.

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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Floating Rate Loan Risk: Floating rate loans (or bank loans) are usually rated below investment grade and thus are subject to high yield/high risk or "junk" securities risk. The market for floating rate loans is a private interbank resale market and thus may be subject to irregular trading activity, wide bid/ask spreads and delayed settlement periods. Purchases and sales of loans are generally subject to contractual restrictions that must be fulfilled before a loan can be bought or sold. These restrictions may hamper the Fund's ability to buy or sell loans and negatively affect the transaction price. A significant portion of the floating rate loans held by the Fund may be "covenant lite" loans that contain fewer or less restrictive constraints on the borrower or other borrower-friendly characteristics and offer less protections for investors than covenant loans. It may take longer than seven days for transactions in loans to settle. This may result in cash proceeds not being immediately available to the Fund, requiring the Fund to borrow cash which would increase the Fund's expenses. The Fund is also subject to credit risk with respect to the issuer of the loan. Investments in junior loans involve a higher degree of overall risk.

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U.S. federal securities laws afford certain protections against fraud and misrepresentation in connection with the offering or sale of a security, as well as against manipulation of trading markets for securities. However, it is unclear whether these protections are available to an investment in a loan.

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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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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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High Yield/High Risk or "Junk" Securities Risk: High yield/​high risk securities are typically issued by companies that are highly leveraged, less creditworthy or financially distressed and are considered to be mostly speculative in nature (high risk), subject to greater liquidity risk, and subject to a greater risk of default than higher rated securities. High yield/high risk securities (including loans) may be more volatile than investment grade securities.

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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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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

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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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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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Liquidity Risk: Certain holdings may be difficult to purchase, sell and value, particularly during adverse market conditions, because there is a limited market for the investment or there are restrictions on resale. The Fund may not be able to sell a holding quickly at the price it has valued the holding, may be unable to take advantage of market opportunities or may be forced to sell other more desirable, more liquid securities or sell less liquid or illiquid securities at a loss if needed to raise cash to conduct operations, including to meet redemption requests.

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Industrial Sector Risk: Industrial companies are affected by supply and demand both for their specific product or service and for industrial sector products in general. Government regulation, world events, exchange rates and economic conditions will likewise affect the performance of these companies. For example, aerospace and defense companies can be significantly affected by government spending policies because they rely significantly on government demand for their products and services. Transportation securities, another component of the industrial sector, are cyclical and have occasional sharp price movements which may result from changes in the economy, fuel prices, labor agreements and insurance costs.

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

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Performance

The bar chart and Average Annual Total Returns table below show performance information for the Fund and 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 the returns of:

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a broad-based securities market index that represents the overall domestic debt market (the "Regulatory Benchmark") which the Fund has added to comply with new regulatory requirements and thus may not necessarily represent the Fund's principal investment strategies; and

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a leveraged loan market index that the Investment Adviser considers to be representative of the leveraged loan markets and the Fund's principal investment strategies. The Investment Adviser considers the leveraged loan index to continue to be the appropriate benchmark index for the Fund for performance comparison.

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The bar chart shows the performance of the Fund's Class I 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.

Aristotle Pacific Capital, LLC began managing the Fund on April 17, 2023. Other firms managed the Fund before that date.

Calendar Year Total Returns (%)

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Best and worst quarterly performance reflected within the bar chart: Q2 2020: 7.06%; Q1 2020: (7.68%)