497K

Summary Prospectus

October 1, 2026

VALIC Company I

Mid Cap Strategic Growth Fund

(Ticker: VMSGX)

The Fund’s Statutory Prospectus and Statement of Additional Information, each dated October 1, 2026, as amended and supplemented from time to time, and the most recent shareholder reports are incorporated into and made part of this Summary Prospectus by reference. The Fund is offered only to registered and unregistered separate accounts of The Variable Annuity Life Insurance Company and its affiliates and to qualifying retirement plans and IRAs 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 the above-incorporated information online at https://www.corebridgefinancial.com/rs/prospectus-and-reports/annuities#underlyingfunds. You can also get this information at no cost by calling 800-448-2542 or by sending an e-mail request to Forms.Request@valic.com.

The Securities and Exchange Commission has not approved or disapproved these securities, nor has it determined that this Summary Prospectus is accurate or complete. It is a criminal offense to state otherwise.

Investment Objective

The Fund seeks long-term capital growth.

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. The table and the example below do not reflect the separate account fees charged in the variable annuity or variable life insurance policy (“Variable Contracts”) in which the Fund is offered. If separate account fees were shown, the Fund’s annual operating expenses would be higher. Please see your Variable Contract prospectus for more details on the separate account fees.

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

Management Fees	0.63%
Other Expenses	0.10%
Total Annual Fund Operating Expenses	0.73%

Expense 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 or hold 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 incorporates any applicable fee waiver and/or expense limitation arrangements for only the first year). The Example does not reflect charges imposed by the Variable Contract. If the separate account fees were reflected, the expenses would be higher. See the Variable Contract

prospectus for information on such charges. Although your actual costs may be higher or lower, based on these assumptions and the net expenses shown in the fee table, your costs would be:

1 Year	3 Years	5 Years	10 Years
$75	$233	$406	$906

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). 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 58% of the average value of its portfolio.

Principal Investment Strategies of the Fund

The Subadvisers seek long-term capital growth by investing primarily in growth-oriented equity securities of domestic and foreign mid-cap companies.

Under normal circumstances, at least 80% of the Fund’s net assets will be invested in securities of mid-cap growth companies.For purposes of the Fund’s 80% investment policy, a company is considered to be a growth company if it: (i) issues securities that are represented in a third-party growth-style index or that are classified as a growth company by a third-party vendor; or (ii) meets a relevant equity market measurement in at least one “growth metric” similar to those commonly used by third-party index providers or third-party vendors in growth classifications, such as earnings growth, price-to-earnings or sales growth, among others. Generally, mid-cap companies will include companies whose market capitalizations, at the

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time of purchase, range from the market capitalization of the smallest company included in the Russell Midcap® Growth Index to the market capitalization of the largest company in the Russell Midcap® Growth Index during the most recent 12-month period. As of August 31, 2026 , the median stock by market capitalization in the Index was approximately $2.321 billion, and the largest stock was approximately $114.575 billion. The size of the companies in the Index changes with market conditions and the composition of the Index.

The Fund may invest up to 25% of its net assets in securities of foreign issuers, which may include emerging market securities. The securities in which the Fund may invest may be denominated in U.S. dollars or in currencies other than U.S. dollars. The Fund may also invest in private placements.

As part of its investment process, portfolio management considers environmental, social, and governance (“ESG”) risks and opportunities (“ESG Factors”) that it believes are financially material, alongside other fundamental investment factors. Examples of potential financially material ESG Factors include: corporate governance, company culture, exposure to climate change, and human capital management. To assess ESG Factors, portfolio management uses issuer reports, third-party data, and internally-generated analyses and may engage directly with issuers. ESG Factors are one of many considerations in the investment decision-making process, may not be determinative in deciding to include or exclude an investment from the portfolio, and may not be considered for every investment decision.

In order to generate additional income, the Fund may lend portfolio securities to broker-dealers and other financial institutions provided that the value of the loaned securities does not exceed 30% of the Fund’s total assets. These loans earn income for the Fund and are collateralized by cash and securities issued or guaranteed by the U.S. Government or its agencies or instrumentalities.

Principal Risks of Investing in the Fund

As with any mutual fund, there can be no assurance that the Fund’s investment objective will be met or that the net return on an investment in the Fund will exceed what could have been obtained through other investment or savings vehicles. Shares of the Fund are not bank deposits and are not guaranteed or insured by any bank, government entity or the Federal Deposit Insurance Corporation. If the value of the assets of the Fund goes down, you could lose money.

The following is a summary of the principal risks of investing in the Fund.

Management Risk. The investment style or strategy used by a subadviser may fail to produce the intended result. A subadviser’s assessment of a particular security or company may prove incorrect, resulting in losses or underperformance.

Currency Risk. Because the Fund’s foreign investments are generally held in foreign currencies, the Fund could experience gains or losses based solely on changes in the exchange rate between foreign currencies and the U.S. dollar. Such gains or losses may be substantial.

Equity Securities Risk. The Fund invests primarily in equity securities and is therefore subject to the risk that stock prices will fall and may underperform other asset classes. Individual stock prices fluctuate from day-to-day and may decline significantly. The prices of individual stocks may be negatively affected by poor company results or other factors affecting individual prices, as well as industry and/or economic trends and developments affecting industries or the securities market as a whole.

ESG Investment Risk. The Fund’s adherence to its ESG criteria and application of related analyses when selecting investments may impact the Fund’s performance, including relative to similar funds that do not adhere to such criteria or apply such analyses. Additionally, the Fund’s adherence to its ESG criteria and application of related analyses in connection with identifying and selecting investments may require subjective analysis and may be more difficult if data about a particular company or market is limited, such as with respect to issuers in emerging markets countries. The Fund may invest in companies that do not reflect the beliefs and values of any particular investor. Socially responsible norms differ by country and region, and a company’s ESG practices or the subadviser’s assessment of such may change over time. ESG characteristics may not be the only factors considered in selecting investments and as a result, the Fund’s investments may not have favorable ESG characteristics or high ESG ratings.

Foreign Investment Risk. Investment in foreign securities involves risks due to several factors, such as illiquidity, the lack of public information, changes in the exchange rates between foreign currencies and the U.S. dollar, unfavorable political, social and legal developments, or economic and financial instability. Foreign companies are not subject to the U.S. accounting and financial reporting standards and may have riskier settlement procedures. U.S. investments that are denominated in foreign currencies or that are traded in foreign markets, or securities of U.S. companies that have significant foreign operations may be subject to foreign investment risk.

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Mid Cap Strategic Growth Fund

Emerging Markets Risk. In addition to the risks associated with investments in foreign securities, emerging market securities are subject to additional risks, which cause these securities generally to be more volatile than securities of issuers located in developed countries.

Growth Style Risk. Generally, “growth” stocks are stocks of companies that have anticipated earnings ranging from steady to accelerated growth. Many investors buy growth stocks because of anticipated superior earnings growth, but earnings disappointments often result in sharp price declines. Growth companies usually invest a high portion of earnings in their own businesses so their stocks may lack the dividends that can cushion share prices in a down market. In addition, the value of growth stocks may be more sensitive to changes in current or expected earnings than the value of other stocks, because growth stocks trade at higher prices relative to current earnings.

Market Risk. The Fund’s share price can fall because of weakness in the broad market, a particular industry, or specific holdings or due to adverse social, political or economic developments here or abroad, changes in investor psychology, technological disruptions, or heavy institutional selling and other conditions or events (including, for example, military confrontations, war, terrorism, trade wars, disease/virus outbreaks and epidemics). The prices of individual securities may fluctuate, sometimes dramatically, from day to day. The prices of stocks and other equity securities tend to be more volatile than those of fixed-income securities.

Mid-Cap Company Risk. Investing in mid-cap companies carries the risk that due to current market conditions these companies may be out of favor with investors. Stocks of mid-cap companies may be more volatile than those of larger companies due to, among other reasons, narrower product lines, more limited financial resources and fewer experienced managers.

Privately Placed Securities Risk. The Fund’s investments may also include privately placed securities, which are subject to resale restrictions. These securities will have the effect of increasing the level of Fund illiquidity to the extent the Fund may be unable to sell or transfer these securities due to restrictions on transfers or on the ability to find buyers interested in purchasing the securities. The illiquidity of the market, as well as the lack of publicly available information regarding these

securities, may also adversely affect the ability to arrive at a fair value for certain securities at certain times and could make it difficult for the Fund to sell certain securities.

Securities Lending Risk. Engaging in securities lending could increase the market and credit risk for Fund investments. The Fund may lose money if it does not recover borrowed securities, the value of the collateral falls, or the value of investments made with cash collateral declines. The Fund’s loans will be collateralized by securities issued or guaranteed by the U.S. Government or its agencies and instrumentalities, which subjects the Fund to the credit risk of the U.S. Government or the issuing federal agency or instrumentality. If the value of either the cash collateral or the Fund’s investments of the cash collateral falls below the amount owed to a borrower, the Fund also may incur losses that exceed the amount it earned on lending the security. Securities lending also involves the risks of delay in receiving additional collateral or possible loss of rights in the collateral if the borrower fails. Another risk of securities lending is the risk that the loaned portfolio securities may not be available to the Fund on a timely basis and the Fund may therefore lose the opportunity to sell the securities at a desirable price.

Performance Information

The below bar chart and table illustrate the risks of investing in the Fund by showing changes in the Fund’s performance from calendar year to calendar year and comparing the Fund’s average annual returns to those of the Russell 3000® Index (a broad-based securities market index) and the Russell Midcap® Growth Index, which is relevant to the Fund because it has characteristics similar to the Fund’s investment strategies. Fees and expenses incurred at the contract level are not reflected in the bar chart or table. If these amounts were reflected, returns would be less than those shown. Of course, past performance of the Fund is not necessarily an indication of how the Fund will perform in the future.

Janus Henderson Investors US LLC (“Janus”) assumed sub-advisory duties of the Fund effective December 7, 2015. Allianz Global Investors U.S. LLC (“AllianzGI”) served as a subadviser from March 22, 2011 through July 25, 2022. Voya Investment Management Co. LLC (“Voya IM”) assumed sub-advisory duties of the Fund from AllianzGI effective July 25, 2022.

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Mid Cap Strategic Growth Fund

The percentage of the Fund’s assets that each subadviser manages may, at the adviser’s discretion, change from time to time.

During the period shown in the bar chart:

Highest Quarterly Return:	June 30, 2020	27.28%
Lowest Quarterly Return:	March 31, 2020	-21.73%
Year to Date Most Recent Quarter:	June 30, 2026	14.56%

Average Annual Total Returns (For the periods ended December 31, 2025)

	1 Year	5 Years	10 Years
Fund	11.34%	7.88%	13.56%
Russell 3000® Index (reflects no deduction for fees, expenses or taxes)	17.15%	13.15%	14.29%
Russell Midcap® Growth Index (reflects no deduction for fees, expenses or taxes)	8.66%	6.65%	12.49%

Investment Adviser

The Fund’s investment adviser is The Variable Annuity Life Insurance Company.

The Fund is subadvised by Janus and Voya IM.

Portfolio Managers

Name and Title	Portfolio Manager of the Fund Since
Janus
Brian Demain, CFA1 Portfolio Manager	2015
Cody Wheaton, CFA Portfolio Manager	2016
Voya IM
Jeffrey D. Parker, CFA, MBA2 Portfolio Manager, Head of Thematic Equities	2020
Raymond F. Cunha, CFA, MBA Senior Portfolio Manager and Equity Analyst	2020
John Coyle, Jr. Portfolio Manager, Equity Analyst	2025

Effective October 31, 2027, Mr. Demain will no longer serve as a portfolio manager to the Fund.

Effective December 31, 2026, Mr. Parker will no longer serve as a portfolio manager to the Fund.

Purchases and Sales of Fund Shares

Shares of the Funds may only be purchased or redeemed through Variable Contracts offered by the separate accounts of VALIC or other participating life insurance companies and through qualifying retirement plans (“Plans”) and IRAs. Shares of each Fund may be purchased and redeemed each day the New York Stock Exchange is open, at the Fund’s net asset value determined after receipt of a request in good order.

The Funds do not have any initial or subsequent investment minimums. However, your insurance company may impose investment or account value minimums. The prospectus (or other offering document) for your Variable

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Mid Cap Strategic Growth Fund

Contract contains additional information about purchases and redemptions of the Funds’ shares.

Tax Information

A Fund will not be subject to U.S. federal income tax so long as it qualifies as a regulated investment company and distributes its income and gains each year to its shareholders. However, contractholders may be subject to federal income tax (and a federal Medicare tax of 3.8% that applies to net income, including taxable annuity payments, if applicable) upon withdrawal from a Variable Contract. Contractholders should consult the prospectus (or other offering document) for the Variable Contract for additional information regarding taxation.

Payments to Broker-Dealers and
Other Financial Intermediaries

The Funds are not sold directly to the general public but instead are offered to registered and unregistered separate accounts of VALIC and its affiliates and to Plans and IRAs. The Funds and their related companies may make payments to the sponsoring insurance company or its affiliates for recordkeeping and distribution. These payments may create a conflict of interest as they may be a factor that the insurance company considers in including the Funds as underlying investment options in a variable contract. Visit your sponsoring insurance company’s website for more information.

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