SUMMARY PROSPECTUS — MAY 1, 2023, AS REVISED OCTOBER 5, 2023

Guardian Core Fixed Income VIP Fund

This Summary Prospectus is intended for use in connection with variable annuity contracts and variable life insurance policies issued by The Guardian Insurance & Annuity Company, Inc. and is not intended for use by other investors. Before you invest, you may want to review the Fund's Statutory Prospectus, which contains more information about the Fund and its risks. You can find the Statutory Prospectus and other information about the Fund, including the Fund's Statement of Additional Information (SAI) and most recent annual and semi-annual reports to shareholders, online at http://guardianvpt.onlineprospectuses.net/GuardianVPT/Prospectuses. You can also obtain this information at no cost by calling our Customer Service Office Contact Center at 1-888-GUARDIAN (1-888-482-7342) or from your financial intermediary. This Summary Prospectus incorporates by reference the Fund's Prospectus and SAI, each dated May 1, 2023, as may be amended or supplemented from time to time.

Investment Objective

The Fund seeks to provide a high level of current income and capital appreciation without undue risk to principal.

Fees and Expenses of the Fund

This table shows the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. The table does not reflect charges, fees or expenses that are, or may be, imposed under your variable annuity contract or variable life insurance policy through which Fund shares are offered as an investment option. If those charges, fees or expenses were reflected, the fees and expenses shown in the table would be higher. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the fee table or example below. For information about these charges, fees and expenses, please refer to the applicable contract or policy prospectus.

Annual Fund Operating Expenses

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

Management Fees					0.43	%
Distribution and Service (12b-1) Fees					None
Other Expenses					0.09	%
Total Annual Fund Operating Expenses					0.52	%
Fee Waiver and/or Expense Reimbursement1​					-0.02	%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement					0.50	%

¹​   Park Avenue Institutional Advisers LLC, the Fund's investment manager (the "Manager"), has contractually agreed through April 30, 2024 to waive certain fees and/or reimburse certain expenses incurred by the Fund to the extent necessary to limit the Fund's Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement to 0.50% of the Fund's average daily net assets (excluding, if applicable, any acquired fund fees and expenses, taxes, interest, transaction costs and brokerage commissions, litigation and extraordinary expenses). The limitation may not be increased or terminated prior to this time without action by the Board of Trustees.

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. This Example does not reflect charges, fees or expenses that are, or may be, imposed under your variable annuity contract or variable life insurance policy, and would be higher if it did. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

				1 Year				3 Years				5 Years				10 Years
Guardian Core Fixed Income VIP Fund				$	51			$	165			$	289			$	651

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. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance. As of the end of its most recent fiscal year, the Fund's portfolio turnover rate was 90% of the average value of its portfolio.

Principal Investment Strategies

Park Avenue Institutional Advisers LLC (the "Manager") pursues the Fund's investment objective by investing, under normal circumstances, at least 80% of its net assets plus any borrowings for investment purposes (measured at the time of investment) in investment grade debt securities. The Fund's debt securities may include without limitation: long- and short-term corporate debt obligations; mortgage-backed, mortgage-related, and other asset-backed securities; convertible bonds; U.S. government securities, including securities issued by agencies or instrumentalities of the U.S. government; and U.S. dollar-denominated obligations of foreign governments, corporations and banks (i.e., Yankee Bonds).

The Manager uses bond market sector allocation, comprehensive credit analysis and yield curve positioning to select securities for the Fund. Yield curve positioning represents the relationship between the interest rates of bonds having the same credit quality but different maturity dates. Under normal market conditions, the average duration of the Fund's portfolio is expected to be between 3 and 10 years. Duration is a measure of a bond price's sensitivity to changes in interest rates. The Fund may lengthen or shorten its duration within the intermediate range to reflect changes in the overall composition of the investment grade debt markets. An investment grade security is one that is rated Baa3 and higher by Moody's Investors Service, Inc. or BBB- and higher by Standard & Poor's Ratings Group or, if unrated, has been determined by the Manager to be of comparable quality.

Although the Fund will primarily be invested in domestic securities, up to 20% of the Fund's assets may be invested in foreign debt securities, which may be denominated in foreign currencies. The Fund may purchase or sell securities on a when-issued, to-be-announced (TBA), delayed delivery or forward commitment basis and may engage in short-term trading of portfolio securities. There is no limitation on the maturity of any specific security the Fund may purchase, and the Fund may sell any security before it matures. The Fund may also utilize dollar roll transactions to obtain market exposure to certain types of securities, particularly mortgage-backed securities. A mortgage dollar roll transaction involves a sale by a Fund of a mortgage-backed security concurrently with an agreement by the Fund to repurchase a similar security at a later date at an agreed-upon price.

The Fund may enter into exchange-traded or over-the-counter derivatives transactions of any kind, such as futures contracts (both long and short positions), options on futures, and swap contracts, including, for example, interest rate swaps and credit default swaps. The Fund also may enter into exchange-traded or over-the-counter foreign currency exchange transactions, including currency futures, forward, and option transactions. The Fund may enter into any of these transactions for a variety of purposes, including, but not limited to, hedging various risks such as credit risk, interest rate risk, currency risk, and liquidity risk; taking a net long or short position in certain investments or markets; providing liquidity in the Fund; equitizing cash; minimizing transaction costs; generating income; adjusting the Fund's sensitivity to interest rate risk, currency risk, or other risk; replicating certain direct investments; and asset and sector allocation.

The Fund may also invest in other investment companies, including exchange-traded funds (ETFs), for cash management purposes or to seek exposure to a particular asset class. The Manager regularly reviews the Fund's investments and may sell investments when it believes the securities are no longer attractive due to valuation, changes in the fundamental outlook of the company or if it considers other investments more attractive.

Principal Investment Risks

The risks summarized below are the principal risks of investing in the Fund. There is no guarantee that the Fund will achieve its investment objective and it is possible to lose money by investing in the Fund.

Market Risk. The financial and securities markets are very volatile and may be affected by political, regulatory, social, economic, and other global market developments and disruptions, including those arising out of geopolitical events, public health emergencies (such as the spread of infectious diseases, pandemics and epidemics), natural disasters, terrorism, and governmental or quasi-governmental actions. The market value of securities in which the Fund invests is based upon the market's perception of value and is not necessarily an objective measure of the securities' value. Such changes may be rapid and unpredictable. These events may negatively affect issuers, industries and markets worldwide and adversely affect the Fund and its investments. The price, value or liquidity of the Fund's investments may decline and will fluctuate, sometimes rapidly and unpredictably, in response to general market conditions or other factors. Different

sectors of the fixed income market, issuers, and security types may react differently to such developments. The fixed income investments in which the Fund invests may underperform other segments of the fixed income market or the fixed income market as a whole. Although prices of fixed income investments tend to rise and fall less dramatically than those of equity securities, they may experience heightened volatility and limited liquidity during certain market and economic conditions.

Issuer Risk. The Fund's investments may be adversely affected by a number of factors that directly relate to the issuer of securities held by the Fund, such as its earnings prospects and overall financial position. In addition, an issuer in which the Fund invests, or to which it has exposure, may perform poorly because of poor management decisions or other events, conditions, or factors, which could also negatively affect the Fund.

Active Management Risk. The Fund is actively managed by the Manager. There is no guarantee that the Manager's investment techniques, risk analysis, and judgment implemented in making investment decisions for the Fund will be accurate or will produce the desired outcome. As a result, the Fund may be adversely affected and may underperform its benchmark index or funds with similar investment objectives. The Fund may actively and frequently trade portfolio securities, which may lead to higher transaction costs that may negatively affect the Fund's performance.

Credit Risk. The Fund may lose money if the issuer or guarantor of a fixed income or debt instrument is unable or unwilling, or is perceived as unable or unwilling, to pay interest or repay principal on time or otherwise to honor its obligations. A fixed income or debt instrument held by the Fund may be adversely affected by changes in, or the market's perception of, the financial strength (or credit rating) of its issuer or guarantor or the credit rating of the instrument. Credit ratings may decrease rapidly and may not be an accurate assessment of liquidity or credit risk. Actual or perceived changes in economic, social, health, financial or political conditions in general or that affect a particular type of instrument, issuer, guarantor or counterparty can reduce the ability of the party to meet its obligations, which can affect the credit quality, liquidity and/or value of an instrument. The value of an instrument also may decline for reasons that relate directly to the issuer, guarantor or counterparty, such as management performance, financial leverage and reduced demand for goods and services.

Interest Rate Risk. The value of the Fund's investments may decline because of a change in interest rates. The negative impact on fixed income and debt instruments from potential interest rate changes could be swift and significant, including falling market values, increased redemptions and reduced liquidity. The value of an instrument with a longer duration will be more sensitive to changes in interest rates than a similar instrument with a shorter duration. Very low or negative interest rates may magnify interest rate risk. Low interest rates (or negative interest rates) may magnify the risks associated with rising interest rates. The Fund may also be subject to heightened interest rate risk when the Federal Reserve raises interest rates. Duration is a measure of a bond price's sensitivity to a given change in interest rates. For example, the price of a bond with a duration of three years would be expected to fall approximately 3% if interest rates were to rise by one percentage point. In addition, the Fund is subject to the risk that the Fund's income will decline because of falling interest rates, including negative interest rates, if the Fund holds floating or variable rate debt securities or if an issuer fails to pay interest and principal in a timely manner.

Mortgage-Backed and Other Asset-Backed Securities Risk. Mortgage-backed and other asset-backed securities are subject to the risks associated with fixed income investments. The value of mortgage-backed and other asset-backed securities held by the Fund may be adversely affected by, among other things, changes or perceived changes in interest rates and may exhibit additional volatility during periods of rising interest rates as a result of extended duration. In addition, mortgage-backed and other asset-backed securities are subject to the risk that underlying obligations will be repaid sooner (known as "prepayment risk") or later (known as "extension risk") than expected because of changes in interest rates, either of which may result in lower than expected returns for the Fund. Because mortgage-backed securities are backed by mortgage loans, they also are subject to risks associated with the ownership of real estate and the real estate industry.

Convertible Securities Risk. Debt securities that are convertible into preferred or common stocks are subject to the risks of both debt and equity securities. The market value of a convertible security performs like that of a regular debt security but because a portion of the convertible security's value is based on common stock into which it may be converted, a convertible security is also subject to the same types of market and issuer risks that apply to the underlying common stock.

U.S. Government Securities Risk. U.S. government securities may or may not be backed by the full faith and credit of the U.S. government and are subject to the risks associated with fixed-income instruments, particularly interest rate risk and credit risk. The Fund is subject to the 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.

Counterparty Risk. Certain investments or investment transactions are subject to the risk that the Fund's counterparty will become insolvent or otherwise be unwilling or unable to perform its obligations in a timely manner or at all. As a result, the Fund may be unable to recover its investment from the counterparty or may obtain a limited recovery, and/or recovery may be delayed, which may result in a loss to the Fund.

Derivatives Risk. Derivatives are instruments whose value depends on (or is derived from) the value of an underlying security, asset, or other benchmark. Derivatives (including short exposures through derivatives) pose risks in addition to and greater than those associated with investing directly in other investments, including potentially heightened liquidity and valuation risk, counterparty risk, market risk, operational risk and legal risk. In addition, certain derivatives result in leverage, which can result in losses substantially greater than the amount invested in the derivatives by the Fund.

Foreign Investment and Currency Risk. Foreign investments, or exposure to foreign markets, present greater risks than investing in securities of U.S. issuers. Foreign securities are particularly susceptible to liquidity and valuation risk and may be especially volatile. These investments are subject to additional risks, including: smaller markets; differing reporting, accounting, and auditing standards; nationalization, expropriation, or confiscatory taxation; foreign currency fluctuations, currency blockage, or replacement; potential for default on sovereign debt; and political changes or diplomatic developments, which may include the imposition of economic sanctions or other measures by the United States or other governments and supranational organizations. Economic sanctions may be, and have been, imposed against certain countries, organizations, companies, entities and/or individuals. Economic sanctions and other similar governmental actions or developments could, among other things, adversely impact the value and liquidity of the Fund's foreign investments and the Fund's ability to invest in foreign investments. The Fund's foreign investments that are denominated in or provide exposure to a foreign currency may be negatively affected by a decline in the foreign currency's value relative to the U.S. dollar. The value of foreign currencies may fluctuate quickly and significantly. Foreign investments may also be subject to risk of loss because of more or less foreign government regulation, less public information, and less stringent investor protections and disclosure standards.

Forwards and Futures Contracts Risk. Forwards and futures contracts are derivative contracts that obligate a purchaser to purchase, and a seller to sell, a specific amount of an asset (e.g., a currency or security) at a specified future date and price. In addition to the risks generally applicable to derivatives, these contracts are particularly subject to the risk of imperfect correlation between the change in market value of the asset underlying a contract or the asset held by the Fund being hedged and the price of the forward or futures contract, as well as losses caused by unanticipated market movements, which are potentially unlimited.

Liquidity and Valuation Risk. The Fund's investments may be difficult to sell at a favorable time or price. To meet redemption requests or otherwise raise cash, the Fund may be forced to sell investments at a disadvantageous time and/or price. In addition, it may be difficult for the Fund to accurately value investments or purchase or sell investments within a reasonable time at the price at which it has been valued for purposes of the Fund's net asset value. Certain investments, including thinly-traded securities, are particularly susceptible to liquidity and valuation risk. The Fund's fixed-income instruments may experience reduced liquidity as a result of the lack of an active market or limited dealer market-making capacity. Liquidity risk may be magnified during periods of rising interest rates or periods of significant shareholder redemptions.

New/Small Fund Risk. The Fund has limited or no operating history and may initially operate with a small asset base. There can be no assurance that the Fund will be successful or grow to or maintain a viable size.

Options Risk. An option is a derivative contract where, for a premium payment or fee, the purchaser of the option is given the right but not the obligation to buy (a call option) or sell (a put option) the underlying asset (or settle for cash an amount based on an underlying asset, rate or index) at a specified price (the exercise price) during a period of time or on a specified date or dates. In addition to the risks generally applicable to derivatives, the prices of options can be highly volatile and the Fund's use of options can lower total returns and may affect the Fund's portfolio turnover rate and the amount of brokerage commissions paid by the Fund.

Other Investment Companies Risk. To the extent the Fund invests in other investment companies (such as ETFs), the Fund will incur a pro rata share of the expenses of these investment companies and the Fund will be subject to the risks associated with these investment companies. An ETF may trade in the secondary market at a price below or above the value of its underlying portfolio and may not be liquid. In addition, an ETF may not replicate exactly the performance of the index it seeks to track for a number of reasons.

Sovereign Debt Risk. The debt securities issued by sovereign entities may decline as a result of default or other adverse credit event resulting from a sovereign debtor's unwillingness or inability to repay principal and pay interest in a timely manner, which may be affected by a variety of factors, including its cash flow situation, the extent of its reserves, the

availability of sufficient foreign exchange on the date a payment is due, the relative size of the debt service burden to the economy as a whole, the sovereign debtor's policy toward international lenders, and the political constraints to which a sovereign debtor may be subject. Sovereign debt risk is increased for emerging market issuers.

Swaps Risk. Swap agreements are derivatives contracts where the parties agree to exchange the returns (or differentials in rates of return) earned or realized on particular predetermined investments or instruments. In addition to the risks generally applicable to derivatives, risks associated with swap agreements include adverse changes in the returns of the underlying instruments, failure of the counterparties to perform under the agreement's terms and the possible lack of liquidity with respect to the agreements.

Performance

No performance history is presented for the Fund because it does not yet have a full calendar year of performance. Updated performance information will be available at www.guardianlife.com or by calling the phone number on the back of the Prospectus.

Management

Park Avenue Institutional Advisers LLC serves as the Fund's manager. The following persons are jointly and primarily responsible for the day-to-day management of the Fund:

Portfolio Manager				Title with the Manager				Managed Fund Since
Andrew Liggio, CFA				Senior Managing Director				March 16, 2023
Danielle DePippo, CFA				Managing Director				October 5, 2023
John Gargana				Managing Director				Inception (May 1, 2022)
David Padulo, CFA				Managing Director				Inception (May 1, 2022)
Demetrios Tsaparas, CFA				Senior Director				October 5, 2023

Purchase and Sale of Fund Shares

The Fund offers its shares only as underlying investment options to variable annuity contracts or variable life insurance policies issued by The Guardian Insurance & Annuity Company, Inc. ("GIAC"). You choose investment options through your contract or policy. You do not purchase Fund shares directly from, or redeem Fund shares directly with, the Fund. Please refer to your contract or policy prospectus for more information regarding the purchase and sale of Fund shares.

Tax Information

No tax information is provided because the Fund's shareholders are separate accounts of GIAC. For information concerning the tax consequences applicable to your variable annuity contract or variable life insurance policy, please refer to your contract or policy prospectus or consult with your tax advisor.

Financial Intermediary Compensation

If you purchase your variable annuity contract or variable life insurance policy through a broker-dealer or other financial intermediary, GIAC, the Fund or their affiliates may pay the intermediary for the sale of the contract or policy, the selection of the Fund and certain related services. These payments may create a conflict of interest by influencing the intermediary and your salesperson to recommend the contract or policy over another investment or annuity or insurance product, or to recommend the Fund over another investment option available under the contract or policy. Ask your salesperson or visit your financial intermediary's website for more information.

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