Filed Pursuant to Rule 424(b)(5)
Registration Statement No. 333-271834

PROSPECTUS

Kelly Services, Inc.

Direct Stock Purchase and

Dividend Reinvestment Plan

Kelly Services, Inc. (“Kelly” or the “Company”) is pleased to offer you the opportunity to participate in our Direct Stock Purchase and Dividend Reinvestment Plan, or the Plan. The Plan is designed to provide you with a convenient method to purchase shares of our Class A Common Stock, par value $1.00 per share, and to reinvest cash dividends in the purchase of additional shares.

The Plan is administered by Computershare Trust Company, N.A., an entity independent of, and not affiliated with, Kelly. The Plan Administrator, along with its designated affiliates, maintains records, prepares and sends account statements to participants, and performs other duties related to the Plan.

This prospectus relates to 1,000,000 shares of our Class A Common Stock to be offered for purchase under the Plan. Shares of Class A Common Stock are non-voting.

Shares of Class A Common Stock purchased under the Plan will be, at our option, newly-issued shares, shares held in our treasury or shares purchased in the open market by the Plan Administrator.

This prospectus contains a summary of the material provisions of the Plan and should be retained for future reference.

Our Class A Common Stock is traded on the Nasdaq Global Market under the symbol “KELYA.” The average of the high and low prices of the Class A Common Stock as reported on the Nasdaq Global Market on May 22, 2023 was $19.22 per share.

Investing in our Class A Common Stock involves risks that are referenced in “Risk Factors” beginning on page 8 of this prospectus.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved these securities, or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus is May 23, 2023.

Table of Contents

Information About Kelly

Founded by William Russell Kelly in 1946, Kelly pioneered an industry that connects people to work in ways that enrich their lives. Our inception helped usher in and embolden a workforce of women, opening doors and creating completely new opportunities. Over the next 75 years, as work evolved, Kelly equipped people with skills to master the technologies of the day: launching the first-of-its-kind online learning center for scientists; creating testing and training packages for breakthrough office programs; and launching skill builders that aligned with new light industrial protocols. With each advance, Kelly met the needs of the marketplace; empowering our people to reach their personal goals and enabling our clients to access skilled talent to move their businesses forward.

As work has evolved so has Kelly’s range of solutions, growing over the years to reflect the changing needs of businesses and the desires and lifestyles of talent. We have progressed from a traditional office staffing business to a creative, insightful and agile talent company delivering expertise in a portfolio of specialty services. In line with market demand, we are increasingly delivering a variety of outcome-based services in which we provide specialized talent and operational management of functions and departments on behalf of our clients.

We rank as one of the world’s largest scientific and clinical research staffing providers and place talent at various levels in engineering, IT and telecommunications specialties. We are also a leading education staffing provider in the U.S., as well as providing talent across the full education spectrum from early childhood education to higher education. These services complement our expertise in professional office services, contact center and light industrial staffing. As work has evolved and talent management has become more complex, we have also developed innovative solutions to help many of the world’s largest companies plan for and manage their workforce through recruitment outsourcing, payroll processing, talent advisory, career transition and supplier management services.

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We are a Delaware corporation with our principal executive offices located at 999 West Big Beaver Road, Troy, Michigan 48084. Our telephone number is (248) 362-4444.

Key Features of the Plan

Enrollment: If you currently own Class A Common Stock registered in your name, you may participate in the Plan by completing and returning an Enrollment Form. If you own Class A Common Stock, but your shares are currently held by a bank or broker in their name (i.e., “street name”), first you will need to register the shares in your name and then complete an Enrollment Form.

If you currently do not own any shares of Class A Common Stock, you can participate by making an initial cash investment of at least $250 to purchase Class A Common Stock. Alternatively, you may authorize the monthly investment feature and initiate your investment with only $50 and a commitment for at least five sequential purchases of Class A Common Stock.

Additional Investments: Once you have enrolled, you may make additional investments in any amount from $25 up to a maximum of $10,000 per transaction not to exceed $100,000 per year, by check or through automatic monthly deductions from a qualified U.S. bank account.

Dividend Reinvestments: You can reinvest all or a portion of your cash dividends in additional shares of Class A Common Stock, or the Plan Administrator will remit any cash dividends to you either by check or by automatic deposit to a U.S. bank account you designate. You may change your reinvestment election at any time.

Safekeeping of Shares: All shares of Class A Common Stock purchased through the Plan will be held by the Plan Administrator in book-entry form in your account. If you hold Class A Common Stock certificates outside of the Plan, you may deposit those certificates for safekeeping with the Plan Administrator and those shares will be reflected in your Plan account.

Sale of Shares: The Plan provides you with the ability to sell all or any portion of Class A Common Stock held in the Plan in book-entry form. You may also request to receive a certificate for these shares and sell the shares outside the Plan.

Fees: There are certain enrollment, investment, trading and sales fees associated with the Plan.

More Information: For more information about the Plan, please call the Plan’s toll free number, (866) 249-2607, or visit our website at kellyservices.com.

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Information About the Plan

1. How does a Kelly stockholder enroll in the Plan?

If you are already a Kelly stockholder of record (i.e., if you own shares that are registered in your name, not your broker’s), you may enroll in the Plan on line, by telephone, or by completing and returning an Enrollment Form to the Plan Administrator.

2. I already own shares, but they are held by my bank or broker and registered in “street name.” How can I participate?

If you currently own shares of Kelly stock that are held on your behalf by a bank or broker (i.e., “street name”), you will need to arrange with your bank or broker to have at least one share registered directly in your name in order to be eligible to participate in the Plan. Once the shares are registered in your name, you can enroll online, by telephone, or complete an Enrollment Form. Alternatively, you may enroll in the Plan in the same manner as someone who is not currently a stockholder.

3. I am not currently a stockholder. May I participate in the Plan?

You can make an initial cash investment in the Plan for as little as $250 but not more than $10,000. Your initial investment can be made:

Via online enrollment by:

Authorizing one deduction (minimum of $250) from your U.S bank account;

Authorizing a minimum of five monthly $50 automatic deductions from your U.S. bank account; or

Opening your account on-line and sending to the Plan Administrator your initial investment of $250 or more by check payable to Kelly Services, Inc./Computershare Trust Company, N.A.

Using the Enrollment Form and:

Making one payment (minimum of $250) by check payable to Kelly Services, Inc./Computershare Trust Company, N.A. or by authorizing a deduction from your U.S. bank account; or

By authorizing a minimum of five monthly $50 automatic deductions from your U.S. bank account.

4. Are there fees associated with enrollment?

Participation in the Plan is subject to the following fees. These fees may change at any time and you will be notified of any changes:

Cost to Participants

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Trading fees include any applicable brokerage commissions the Plan Administrator is required to pay. Any fractional share will be rounded up to a whole share for purposes of calculating the per share fee.

5. Who may participate in the Plan?

All U.S. citizens are eligible to participate, whether or not they are currently stockholders. Foreign citizens are eligible to participate as long as their participation would not violate any laws in their home countries.

6. What types of payments are acceptable?

All payments must be in U.S. funds and drawn on a U.S. bank. Cash, money orders, traveler’s checks or third party checks will not be accepted.

7. What are the minimum and maximum amounts for additional investments?

The minimum amount for additional investments is $25 per transaction and the maximum amount per transaction is $10,000 not to exceed $100,000 during any calendar year. 

8. How do I make an additional investment?

If you already own Class A Common Stock and are enrolled in the Plan and want to make additional purchases, you can authorize an individual automatic deduction from your U.S. bank account or send a check to the Plan Administrator for each purchase. If you choose to submit a check, please make sure to include the contribution form from your Plan statement and mail it to the address specified on the statement. If you wish to make regular monthly purchases, you may authorize automatic monthly deductions from your bank account. Additional cash purchases are subject to a minimum purchase requirement of $25 per transaction and a maximum of $10,000 per transaction not to exceed $100,000 annually.

9. May I have additional investments automatically deducted from my bank account?

You may authorize automatic monthly deductions from your U.S. bank account by completing and returning a direct debit authorization form, or you may submit a request online at computershare.com/investor. Initial set-up, changes and terminations to the automatic deduction will be made as soon as practicable. Once effective, funds will be deducted from your designated account on the 15th day of each month, or the next business day if the 15th is not a business day.

10. Will I be charged fees for additional investments?

No. Any service fees or trading fees for purchases after the initial purchase will be paid for by Kelly.

11. How are payments with “insufficient funds” handled?

If the Plan Administrator does not receive a payment because of insufficient funds or incorrect draft information, the requested purchase will be deemed void, and the Plan Administrator will immediately remove from your account any shares purchased in anticipation of receiving such funds. If the net proceeds from the sale of such shares are insufficient to satisfy the balance of the uncollected amounts, the Plan Administrator may sell additional shares from your account as necessary to satisfy the uncollected balance.

In addition, an “insufficient funds” fee of $35.00 will be charged. The Plan Administrator may place a hold on the Plan account until the “insufficient funds” fee is received from you, or may sell shares from your account to satisfy any uncollected amounts.

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12. When will shares be purchased?

The Plan Administrator will generally buy shares on Friday of each week (or the next business day) if your funds are received no later than one business day before that day. For automatic monthly purchases, shares will be purchased promptly after the 15th.

The Plan Administrator will wait up to three business days after receipt of the check or electronic funds transfer to ensure it receives good funds and will then seek to purchase shares from optional cash investments promptly on the investment date.

13. What is the price of shares purchased under the Plan?

If the shares are purchased in the open market, the Plan Administrator may combine your funds with funds of other participants and generally will batch purchase types (cash dividends and optional cash investments) for separate execution by its broker-dealer. At the Plan Administrator’s discretion, these batches may be combined and executed by its broker-dealer. The Plan Administrator may also direct its broker-dealer to execute each purchase type in several batches throughout a trading day. Depending on the number of shares being purchased and current trading volume in shares of Class A Common Stock, the Plan Administrator’s broker-dealer may execute purchases for any batch or batches in multiple transactions and over more than one day. If different purchase types are batched, the price per share of Class A Common Stock purchased for each participant’s account, whether purchased with reinvested cash dividends, with initial cash investments or with optional cash investments, will be the weighted average price of the specific batch for shares of our common stock purchased by the Plan Administrator’s broker-dealer on that investment date.

The purchase price for shares purchased from or sold to Kelly will be the average of the high and low sales price reported on the Nasdaq Global Market for the day of the transaction.

The Plan Administrator will use your investment to purchase as many full shares as possible and will use any amount remaining to purchase a fraction of a share.

14. Must my dividends be reinvested automatically?

No. You may elect full, partial or no reinvestment of your dividends by completing the appropriate enrollment form obtained from the Plan Administrator. If you choose partial reinvestment, you must specify the number of whole shares in your account on which you would like to receive cash payments for dividends.

15. When will my dividends be reinvested and at what price?

The reinvestment of your dividends will generally be completed within one week of the dividend payment date.

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16. What is the source of Kelly stock purchased through the Plan?

At our option, share purchases will be made in the open market or directly from Kelly. Share purchases on the open market may be made on any stock exchange where Class A Common Stock is traded or by negotiated transactions on such terms as the Plan Administrator may reasonably determine. Neither we nor any participant will have any authority or power to direct the date, time, selection of a broker-dealer or price at which shares may be purchased by the Plan Administrator.

17. How do I sell my shares?

You may request that the Plan Administrator sell shares credited to your Plan account in the manners described below:

Market Order: A market order is a request to sell securities promptly at the current market price. Market order sales are only available at www.computershare.com/investor, through Investor Center, or by calling the Plan Administrator directly at 1-866-249-2607. Market order sale requests received at www.computershare.com/investor, through Investor Center, or by telephone will be placed promptly upon receipt during market hours (normally 9:30 a.m. to 4:00 p.m., Eastern Time). Any orders received after 4:00 p.m., Eastern Time, will be placed promptly on the next day the market is open. Depending on the number of shares being sold and current trading volume in the shares, a market order may only be partially filled or not filled at all on the trading day in which it is placed, in which case the order, or remainder of the order, as applicable, will be cancelled at the end of such day. To determine if your shares were sold, you should check your account online

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at www.computershare.com/investor through Investor Center or call the Plan Administrator directly at (866) 249-2607. If your market order sale was not filled and you still want the shares sold, you will need to re-enter the sale request. The price shall be the market price of the sale obtained by the Plan Administrator’s broker, minus a trading fee of $0.12 per share sold. Each market order sale will also incur a service fee of $25.00.

Batch Order: A batch order is an accumulation of all sale requests for a security submitted together as a collective request. Batch orders are submitted on each market day, assuming there are sale requests to be processed. Sale instructions for batch orders received by Plan Administrator will be processed no later than five business days after the date on which the order is received (except where deferral is required under applicable federal or state laws or regulations), assuming the applicable market is open for trading and sufficient market liquidity exists. All sale requests received in writing will be submitted as batch order sales. In every case of a batch order sale, the proceeds to each selling Plan participant for each share sold will be the weighted average sale price obtained by the Plan Administrator’s broker for each aggregate order placed by the Plan Administrator and executed by the broker, minus a trading fee of $0.12 per share sold. Each batch order sale will also incur a service fee of $25.00.

Day Limit Order: A day limit order is an order to sell securities when and if they reach a specific trading price on a specific day. The order is automatically cancelled if the price is not met by the end of that day (or, for orders placed after-market hours, the next day the market is open). Depending on the number of securities being sold and the current trading volume in the securities, such an order may only be partially filled, in which case the remainder of the order will be cancelled. The order may be cancelled by the applicable stock exchange, by the Plan Administrator at its sole discretion or, if the Plan Administrator’s broker has not filled the order, at your request made online at www.computershare.com/investor through Investor Center or by calling the Plan Administrator directly at (866) 249-2607. Each day limit order sale will incur a service fee of $25.00 and a trading fee of $0.12 per share sold.

Good-Til-Cancelled (GTC) Limit Order: A GTC limit order is an order to sell securities when and if the securities reach a specific trading price at any time while the order remains open (generally up to 30 days). Depending on the number of securities being sold and current trading volume in the securities, sales may be executed in multiple transactions and over more than one day. If shares are traded on more than one day during which the market is open, a separate fee will be charged for each such day. The order (or any unexecuted portion thereof) is automatically cancelled if the trading price is not met by the end of the order period. The order may be cancelled by the applicable stock exchange, by the Plan Administrator at its sole discretion or, if the Plan Administrator’s broker has not filled the order, at your request made online at www.computershare.com/investor through Investor Center or by calling the Plan Administrator directly at (866)249-2607. Each GTC limit order sale will incur a service fee of $25.00 and a trading fee of $0.12 per share sold.

The Plan Administrator generally supports the sales options set forth above. All sales options, however, may not be available at all times.

If you prefer, you can withdraw shares from the Plan and sell them through a broker of your own choosing. Shares will normally be mailed to you within two business days of receipt of your instructions. If you sell a portion of your shares, the Plan Administrator will continue to reinvest the dividends on the whole shares previously authorized by you.

All trading fees include any brokerage commissions Computershare is required to pay. Any fractional share will be rounded up to a whole share for purposes of calculating the per share fee.

An additional $15.00 will be charged if the assistance of a Customer Service Representative is required when selling shares.

The Plan Administrator may, for various reasons, require a transaction request to be submitted in writing. Participants should contact the Plan Administrator to determine if their particular request, including any sales request, must be submitted in writing. The Plan Administrator reserves the right to decline to process a sale if it determines, in its sole discretion, that supporting legal documentation is required. In addition, no one will have any authority or power to direct the time or price at which shares for the Plan are sold (except for prices specified for day limit orders or GTC limit orders), and no one, other than the Plan Administrator, will select the broker(s) or dealer(s) through or from whom sales are to be made.

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You should be aware that the price of shares may rise or fall during the period between a request for sale, its receipt by the Plan Administrator and the ultimate sale on the open market. Instructions sent to the Plan Administrator to sell shares are binding and may not be rescinded.

If you elect to sell shares online at www.computershare.com/investor through Investor Center, you may utilize the Plan Administrator’s international currency exchange service to convert your sale proceeds to your local currency prior to being sent to you. Receiving your sales proceeds in a local currency and having your check drawn on a local bank avoids the timely and costly ‘‘collection’’ process required for cashing U.S. dollar checks. This service is subject to additional terms and conditions and fees, which you must agree to online.

18. How does the safekeeping service (book-entry shares) work?

All shares of Kelly stock that are purchased through the Plan will be held by the Plan Administrator and registered in book-entry form in your Plan account on the records of the Plan Administrator. If you hold Class A Common Stock certificates outside the Plan you may also, at any time, deposit those certificates for safekeeping with the Plan Administrator, and the shares represented by the deposited certificates will be included in book-entry form in your Plan account.

19. How do I deposit my Kelly Services stock certificates with the Plan Administrator?

If you own shares of Class A Common Stock in certificated form, you may deposit your certificates for those shares with the Plan Administrator, free of charge. Stock certificates can be mailed to Computershare Trust Company, N.A. at 150 Royall Street, Suite 101, Canton, Massachusetts 02021 , by USPS registered mail or by any overnight courier service, and properly insured.

20. Are there any charges associated with this custodial service?

No. There is no cost to you either for having the Plan Administrator hold the shares purchased for you through the Plan or for having the Plan Administrator deposit into your account the stock certificates you hold.

21. How can I receive a stock certificate?

Normally, stock certificates for shares purchased under the Plan will not be issued; rather shares will be registered in the name of the Plan Administrator or its nominee and credited to your Plan account. However, you may request a stock certificate by indicating your preference on the stub attached to your account statement and forwarding it to the Plan Administrator. Issuance of certificates is subject to an additional fee. Please contact the Plan Administrator to determine the certificate issuance fee. Stock certificates for fractional shares will not be issued under any circumstances.

22. Can I transfer shares that I hold in the Plan to someone else?

Yes. You may transfer ownership of some or all of your Plan shares by sending the Plan Administrator written transfer instructions. Your signature must be “Medallion Guaranteed” by a financial institution. Most banks and brokers participate in the Medallion Guarantee program. The Medallion Guarantee program ensures that the individual signing is in fact the owner of the participant’s account.

You may transfer shares to new or existing Kelly stockholders. However, a new Plan account will not be opened for a transferee as a result of a transfer of less than one full share. If you are opening a new Plan account for a transferee, you must include an Enrollment Form with the transfer instructions. If no indication is given, the new Plan account will be coded for full dividend reinvestment.

You may also obtain information about transferring your shares through the Computershare Transfer Wizard at www.computershare.com/transferwizard. The Transfer Wizard will guide you through the transfer process, assist you in completing the transfer form, and identify other necessary documentation you may need to provide.

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23. How do I close my Plan account?

You may terminate your participation in the Plan either by giving notice to the Plan Administrator or by completing the appropriate section of your account statement and returning it to the Plan Administrator. The Administrator will continue to hold your shares in book-entry form unless you request a certificate for the number of whole shares held in your Plan account and a check for the value of any fractional shares or have all of the shares in your Plan account sold for you as described above and pay applicable fees.

The Plan Administrator will send you your proceeds, without interest, or your certificates as soon as is practicable. If notice of termination is received near a record date for a Plan account whose dividends are to be reinvested, the Plan Administrator, in its sole discretion, may either distribute such dividends in cash or reinvest them in shares on your behalf. In the event reinvestment is made, the Plan Administrator will process the termination as soon as practicable, but in no event later than five business days after the investment is complete.

24. Who administers the Plan?

The Plan is administered by Computershare Trust Company, N.A., with certain administrative duties performed by its designated affiliates. The Plan Administrator acts as agent for Plan participants and keeps records, sends statements and performs other duties relating to the Plan. Purchases and sales of Class A Common Stock under the Plan are made by an independent broker-dealer acting as purchasing agent for Plan participants. To the extent required by applicable law in certain jurisdictions, shares offered under the Plan are offered through an independent broker-dealer.

25. How do I contact the Plan Administrator?

Enrollment, purchase or sale of share requests and other transactions or services offered by the Plan should be directed to the Plan Administrator through the following:

Internet

You can enroll, obtain information and perform certain transactions on your account online at computershare.com/investor.

Telephone

Telephone stockholder customer service, including sale of shares, toll-free within the United States and Canada:

(866) 249-2607

International Telephone Inquiries:

(781) 575-2723

An automated voice response system is available 24 hours a day, 7 days a week. Customer Service Representatives are available from 9:00 a.m. to 7:00 p.m., Eastern Standard Time, Monday through Friday (except holidays).

In Writing

You may also write to the Plan Administrator at one of the following addresses:

Computershare Trust Company, N.A.

P.O. Box 43006

Providence, Rhode Island 02940-3006

For overnight delivery services:

Computershare Trust Company, N.A.

150 Royall Street

Suite 101 Canton, Massachusetts 02021

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Be sure to include your name, address, daytime phone number, Alternate ID number and a reference to Kelly Services, Inc. on all correspondence. When communicating with the Plan Administrator, you should have available your account number and taxpayer identification number.

26. What kind of reports will be sent to participants in the Plan?

You will receive a quarterly statement of account activity. Supplemental account statements will be provided for any month in which you make a cash investment or deposit or transfer or withdraw shares. You will also receive transaction statements promptly after each sale of shares under the Plan. Each account statement will show the amount invested, the purchase or sale price, the number of shares purchased or sold and any applicable fees, as well as any activity associated with share deposits or withdrawals. The statement will also include specific cost basis information in accordance with applicable law. You should retain these statements in order to establish the cost basis of shares purchased under the Plan for income tax and other purposes.

27. How would a stock split or stock dividend affect my account?

Any shares resulting from a stock split or stock dividend paid on shares held in custody for you by the Plan Administrator will be credited to your book-entry position. Of course, you may request a certificate at any time for any or all of your shares.

28. Can I vote my Plan shares?

Under the Plan, participants may purchase only shares of Class A Common Stock. As a general rule, shares of Class A Common Stock are non-voting. As a result, you will generally not be sent a proxy statement in connection with meetings of Kelly Services stockholders, including the annual meeting, and will not be entitled to vote at those meetings.

Under the Delaware General Corporation Law, however, there are certain conditions where shares of Class A Common Stock would have a right to vote. Please refer to the section below entitled “Description of Capital Stock Voting” for more information on the limited voting rights of shares of Class A Common Stock. In that case, you will be sent a proxy statement, together with a proxy card. This proxy card, when duly signed and returned, will be voted as you indicate. Fractional shares will be aggregated and voted in accordance with the participant’s directions. If the proxy card is not returned or if it is returned unsigned, the shares will not be voted.

29. Can the Plan be changed?

We may add to, modify, or discontinue the Plan at any time. We will send you written notice of any significant changes.

Upon discontinuance of the Plan, we will return to you any uninvested automatic deductions from your bank account, any uninvested optional cash investments or initial investment, continue to keep your whole shares credited to your account in book-entry form free of charge and pay you in cash for any fractional shares credited to your account, less applicable fees.

The Plan Administrator also may terminate your Plan account if you do not own at least one whole share. In the event that your Plan account is terminated for this reason, a check for the cash value of the fractional share based upon the then-current market price, less any applicable fees and any other costs of sale will be sent to you and your account will be closed.

30. What are the responsibilities of Kelly and the Plan Administrator?

Neither Kelly nor the Plan Administrator, Computershare Trust Company, N.A., will be liable for any act or omission to act, which was done in good faith, including any claim of liability arising out of the failure to cease reinvestment of dividends for a participant’s account upon the participant’s death prior to receipt of notice in writing of the death along with a request to cease dividend reinvestment from a qualified representative of the deceased, the prices at which shares are purchased or sold (except for prices specified for day limit orders or GTC limit orders) for participants’ accounts, the times when purchases or sales are made, or fluctuations in the market value of shares. In no event shall , Kelly, the Plan Administrator or their agents have any liability as to any inability to purchase shares or as to the timing of any purchase

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Participants should recognize that neither Kelly nor the Plan Administrator can promise a profit or protect against a loss on the Class A Common Stock purchased under the Plan.

Although the Plan provides for the reinvestment of dividends, the declaration and payment of dividends will continue to be determined by our Board of Directors at its discretion, depending upon future earnings, the financial condition of Kelly and other factors. The amount and timing of dividends may be changed, or the payment of dividends terminated, at any time without notice.

Risk Factors

Before investing in shares of our Class A Common Stock, you should carefully consider the specific risks set forth under the caption “Risk Factors” in our Annual Report on Form 10-K for our fiscal year ended January 1, 2023 and in the other reports and documents we file with or furnish to the Securities and Exchange Commission, or SEC. See “Where You Can Find More Information” and “Incorporation of Certain Documents by Reference” for information on how to obtain a copy of our Annual Report and such other reports and documents.

Cautionary Note Regarding Forward-Looking Statements

Certain statements contained in this prospectus are “forward-looking” statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include statements which are predictive in nature, which depend upon or refer to future events or conditions, or which include words such as “expects,” “anticipates,” “intends,” “plans,” “believes,” “estimates,” or variations or negatives thereof or by similar or comparable words or phrases. In addition, any statements concerning future financial performance (including future revenues, earnings or growth rates), ongoing business strategies or prospects, and possible future actions by us that may be provided by management, including oral statements or other written materials released to the public, are also forward-looking statements. Forward-looking statements are based on current expectations and projections about future events and are subject to risks, uncertainties and assumptions about our Company and economic and market factors in the countries in which we do business, among other things. These statements are not guarantees of future performance, and we have no specific intention to update these statements.

Actual events and results may differ materially from those expressed or forecasted in forward-looking statements due to a number of factors. The principal important risk factors that could cause our actual performance and future events and actions to differ materially from such forward-looking statements include, but are not limited to, changing market and economic conditions, the impact of the novel coronavirus (COVID-19) outbreak, competitive market pressures including pricing and technology introductions and disruptions, disruption in the labor market and weakened demand for human capital resulting from technological advances, competition law risks, the impact of changes in laws and regulations (including federal, state and international tax laws), unexpected changes in claim trends on workers’ compensation, unemployment, disability and medical benefit plans, or the risk of additional tax liabilities in excess of our estimates, our ability to achieve our business strategy, our ability to successfully develop new service offerings, material changes in demand from or loss of large corporate customers as well as changes in their buying practices, risks particular to doing business with government or government contractors, the risk of damage to our brands, our exposure to risks associated with services outside traditional staffing, including business process outsourcing, services of licensed professionals and services connecting talent to independent work, our increasing dependency on third parties for the execution of critical functions, our ability to effectively implement and manage our information technology strategy, the risks associated with past and future acquisitions, including risk of related impairment of goodwill and intangible assets, exposure to risks associated with certain equity investments, including with separate strategic partners, risks associated with conducting business in foreign countries, including foreign currency fluctuations, risks associated with violations of anti-corruption, trade protection and other laws and regulations, availability of qualified full-time employees, availability of temporary workers with appropriate skills required by customers, liabilities for employment-related claims and losses, including class action lawsuits and collective actions, our ability to sustain critical business applications through our key data centers, risks arising from failure to preserve the privacy of information entrusted to us or to meet our obligations under global privacy laws, the risk of cyberattacks or other breaches of network or information technology security, our ability to realize value from our tax credit and net operating loss carryforwards, our ability to maintain specified financial covenants in our bank facilities to continue to access credit markets,

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and other risks, uncertainties and factors discussed in this report and in our other filings with the Securities and Exchange Commission. Actual results may differ materially from any forward-looking statements contained herein, and we undertake no duty to update any forward-looking statement to conform the statement to actual results or changes in the Company’s expectations. Certain risk factors are discussed more fully under “Risk Factors” in Part I, Item 1A of the Company’s Annual Report on Form 10-K.

Federal Income Tax Consequences

You should consult with your tax advisor for a complete analysis of the tax consequences of participating in the Plan. Cash dividends reinvested under the Plan will be taxable for U.S. federal income tax purposes as having been received by you even though you have not actually received them in cash plus, in the case where shares are purchased on the open market, your allocable portion of the trading fees paid by us to purchase those shares. Trading fees include any applicable brokerage commissions the Plan Administrator is required to pay. You will receive an annual statement from the Plan Administrator indicating the amount of reinvested dividends reported to the U.S. Internal Revenue Service as dividend income.

You will not realize a gain or loss for U.S. federal income tax purposes upon a transfer of shares to the Plan or the withdrawal of whole shares from the Plan. You will, however, generally realize a gain or loss when shares are sold. The amount of gain or loss will be the difference between the amount that you receive for the shares sold and your tax basis thereof. In order to determine the tax basis for shares in your account, you should retain all account and transaction statements.

Plan participants who are non-resident aliens or non-U.S. corporations, partnerships or other entities generally are subject to a withholding tax on dividends paid on shares held in the Plan. The Plan Administrator is required to withhold from dividends paid the appropriate amount determined in accordance with Internal Revenue Service regulations. Where applicable, this withholding tax is determined by treaty between the U.S. and the country in which the participant resides. In addition, dividends paid on shares in Plan accounts are subject to the backup withholding provisions of the Internal Revenue Code. Accordingly, the amount of any dividends, net of the applicable withholding tax, will be credited to participant Plan accounts for investment in additional shares of Class A Common Stock.

Use of Proceeds

Kelly will receive proceeds from the purchase of Class A Common Stock pursuant to the Plan only to the extent that such purchases are made directly from it and not from open market purchases by the Administrator. Proceeds received by Kelly (the amount of which cannot be estimated) will be used for general corporate purposes.

Plan of Distribution

At the Company’s option, share purchases pursuant to the Plan will be made in the open market or directly from Kelly. Share purchases on the open market may be made on any stock exchange where Class A Common Stock is traded or by negotiated transactions on such terms as the Plan Administrator may reasonably determine. Neither we nor any participant will have any authority or power to direct the date, time, selection of a broker-dealer or price at which shares may be purchased by the Plan Administrator.

The Plan Administrator will generally buy shares on Friday of each week (or the next business day) if funds are received no later than one business day before that day. For automatic monthly purchases, shares will be purchased promptly after the 15th. The Plan Administrator will wait up to three business days after receipt of the check or electronic funds transfer to ensure it receives good funds and will then seek to purchase shares from optional cash investments promptly on the investment date.

If shares are purchased in the open market, the Plan Administrator may combine funds of multiple Plan participants and generally will batch purchase types (cash dividends and optional cash investments) for separate execution by its broker-dealer. At the Plan Administrator’s discretion, these batches may be combined and executed by its broker-dealer. The Plan Administrator may also direct its broker-dealer to execute each purchase type in several batches throughout a trading day. Depending on the number of shares being purchased and current trading volume in shares of Class A Common Stock, the Plan Administrator’s broker-dealer may execute purchases for any batch or batches in multiple transactions and over more

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than one day. If different purchase types are batched, the price per share of Class A Common Stock purchased for each participant’s account, whether purchased with reinvested cash dividends, with initial cash investments or with optional cash investments, will be the weighted average price of the specific batch for shares of our common stock purchased by the Plan Administrator’s broker-dealer on that investment date.

The purchase price for shares purchased from or sold to Kelly will be the average of the high and low sales price reported on the Nasdaq Global Market for the day of the transaction.

The Plan Administrator will use participant investments to purchase as many full shares as possible and will use any amount remaining to purchase a fraction of a share.

Description of Capital Stock

This section contains a description of our capital stock. This description includes not only our Class A Common Stock, but also our Class B Common Stock, which affect the Class A Common Stock. This description summarizes some of the provisions of our Amended and Restated Certificate of Incorporation, a copy of which has been filed as Exhibit 3.1 to the Form 8-K filed with the SEC on November 7, 2018. If you want more complete information, you should read the provisions of our Amended and Restated Certificate of Incorporation that are important to you.

Our authorized capital stock consists of 100,000,000 shares of Class A Common Stock and 10,000,000 shares of Class B Common Stock. As of April 30, 2023, we had outstanding 34,590,876 shares of Class A Common Stock and 3,357,146 shares of Class B Common Stock.

Rights to Dividends and on Liquidation

Each share of Class A Common Stock and Class B Common Stock is entitled to share equally in dividends when and as declared by our Board of Directors; provided that (i) no cash dividend payable on the shares of the Class B Common Stock can be declared unless the Board of Directors at the same time declares a cash dividend on the shares of the Class A Common Stock at a rate which is not less than the rate of the cash dividend payable on the shares of the Class B Common Stock (but a cash dividend may be declared on the Class A Common Stock without declaring a cash dividend on the Class B Common Stock), and (ii) no dividend payable in shares of the Class B Common Stock can be declared on the Class A Common Stock (but a dividend payable in shares of Class A Common Stock may be declared on the Class A Common Stock or the Class B Common Stock and a dividend payable in shares of Class B Common Stock may be declared on the Class B Common Stock). Upon liquidation, each share of Class A Common Stock and Class B Common Stock is entitled to share equally in our assets available for distribution to the holders of those shares.

Voting

All voting power is vested exclusively in the holders of Class B Common Stock. Except as otherwise required by the Delaware General Corporation Law, shares of Class A Common Stock have no voting rights.

Conversion of Class B Common Stock

Each share of Class B Common Stock is convertible, at the option of the stockholder and at any time, into one share of Class A Common Stock.

Preemptive Rights

Holders of Class B Common Stock have the preemptive right to purchase additional shares of Class B Common Stock (or any other voting stock or any security convertible into voting stock) issued at any time by Kelly Holders of Class A Common Stock do not have preemptive rights to purchase additional securities if we issue additional securities.

Legal Matters

The legality and validity of the securities offered from time to time under this prospectus will be passed upon by Vanessa P. Williams, Senior Vice President, General Counsel and Assistant Secretary of the Company.

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Experts

The financial statements and management’s assessment of the effectiveness of internal control over financial reporting (which is included in Management’s Report on Internal Control over Financial Reporting) incorporated in this Prospectus by reference to the Annual Report on Form 10-K for the year ended January 1, 2023 have been so incorporated in reliance on the report (which contains a paragraph relating to the effectiveness of internal control over financial reporting due to the exclusion of Rocket Power Holdings LLC, Rocket Power Ops LLC and Pediatric Therapeutic Services because they were acquired by the Company in a purchase business combination during 2022) of PricewaterhouseCoopers LLP, an independent registered public accounting firm, given on the authority of said firm as experts in auditing and accounting.

Indemnification of Directors and Officers

Section 145 of the General Corporation Law of the State of Delaware and our Amended and Restated Certificate of Incorporation and By-laws provide for indemnification of directors and officers and other persons in certain circumstances.

Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers or persons controlling Kelly pursuant to the foregoing provisions, we have been informed that in the opinion of the SEC such indemnification is against public policy as expressed in the Securities Act of 1933 and is therefore unenforceable.

Where You Can Find More Information

We have filed with the SEC a Registration Statement on Form S-3 under the Securities Act of 1933 with respect to the shares offered by this Prospectus. This Prospectus, which is part of the Registration Statement, omits certain information, exhibits, schedules and undertakings set forth in the Registration Statement. For further information pertaining to us and our Class A Common Stock, reference is made to that Registration Statement and the exhibits and schedules to the Registration Statement. Statements contained in this prospectus as to the contents or provisions of any documents referred to in this prospectus are not necessarily complete, and in each instance where a copy of the document has been filed as an exhibit to the Registration Statement, reference is made to the exhibit for a more complete description of the matters involved.

We file annual, quarterly and current reports, proxy statements and other information with the SEC. Our SEC filings can be read and copied at the SEC’s Public Reference Room at 100 F Street, N.E., Washington, D.C. 20549. The public may obtain information on the operation of the public reference room by calling the SEC at 1-800-SEC-0330. In addition, the SEC maintains an Internet website at www.sec.gov that contains reports, proxy and information statements and other information regarding issuers that file electronically with the SEC, including Kelly.

Our Class A Common Stock is quoted on the Nasdaq Global Market under the symbol “KELYA.”

General information about our company, including our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K, as well as any amendments and exhibits to those reports, are available free of charge through our website at kellyservices.com as soon as reasonably practicable after we file them with, or furnish them to, the SEC. Information on our website is not incorporated into this prospectus or other securities filings and is not a part of these filings.

Incorporation of Certain Documents by Reference

The SEC allows us to “incorporate by reference” in this prospectus the information we file with it, which means that we can disclose important information to you by referring you to those documents. The information we incorporate by reference is an important part of this prospectus, and later information that we file with the SEC will automatically update and supersede some of this information. We incorporate by reference the documents listed below and any future filings we make with the SEC (other than current reports furnished under Item 2.02 or 7.01 of Form 8-K and exhibits filed on such form that are related to such items) under Section 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934 until we sell all of the shares covered by this prospectus or the sale of shares pursuant to this prospectus is terminated and all documents filed (excluding any information furnished rather than filed) between the date of filing of the registration statement of which this prospectus is a part and prior to the effectiveness of the registration statement. The documents we incorporate by reference are:

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All information incorporated by reference is deemed to be part of this prospectus except to the extent that the information is updated or superseded by information filed with the SEC after the date the incorporated information was filed (including later-dated reports listed above) or by the information contained in this prospectus or the applicable prospectus supplement. Any information that we subsequently file with the SEC that is incorporated by reference, as described above, will automatically update and supersede as of the date of such filing any previous information that had been part of this prospectus or the applicable prospectus supplement, or that had been incorporated herein by reference.

You may request a copy of these filings (other than an exhibit to any filing unless we have specifically incorporated that exhibit by reference into the filing), at no cost, by writing or calling us at the following address:

Kelly Services, Inc.

999 West Big Beaver Road

Troy, Michigan 48084

(248) 362-4444

Attention: James M. Polehna

Vice President & Corporate Secretary

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