Stagwell Inc

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

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Preliminary Proxy Statement

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Definitive Proxy Statement

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Soliciting Material Pursuant to §240.14a-12

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One World Trade Center, Floor 65

New York, NY 10007

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

To Be Held on June 11, 2026

To the Stockholders of Stagwell Inc.:

You are cordially invited to attend the Annual Meeting of Stockholders of Stagwell Inc. (the “Company”). The Annual Meeting will be held on Thursday, June 11, 2026 at 11:30 am Eastern Time at the Company’s headquarters, One World Trade Center, Floor 65, New York, NY 10007, for the following purposes:

To vote upon the election of nine (9) directors nominated by our Board of Directors to hold office until the 2027 Annual Meeting of Stockholders.

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To vote upon the approval, on an advisory basis, of the 2025 compensation of our named executive officers.

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To vote upon the ratification of the selection of PricewaterhouseCoopers LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2026.

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To conduct any other business properly brought before the Annual Meeting or any adjournment or postponement thereof.

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These items of business are more fully described in the Proxy Statement accompanying this Notice.

The record date for the Annual Meeting is April 13, 2026. Only stockholders of record at the close of business on that date may vote at the Annual Meeting or any adjournment thereof.

By Order of the Board of Directors

/s/ Edmund D. Graff

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Edmund D. Graff

Senior Vice President, Deputy General Counsel and Corporate Secretary

New York, NY

April 28, 2026

You are cordially invited to attend the Annual Meeting in person. Advance registration is required to attend the Annual Meeting. Admission information can be found on page 1 of the Proxy Statement. Whether or not you expect to attend the Annual Meeting, PLEASE VOTE YOUR SHARES. As an alternative to voting in person at the Annual Meeting, you may vote your shares in advance online, by telephone or, if you receive a paper proxy card in the mail, by mailing the completed proxy card. Voting instructions are provided in the Notice of Internet Availability of Proxy Materials or, if you receive a paper proxy card by mail, the instructions are printed on your proxy card. Even if you have voted by proxy, you may still vote in person if you attend the Annual Meeting. Please note, however, that if your shares are held of record by a broker, bank or other nominee and you wish to vote at the Annual Meeting, you must obtain a proxy issued in your name from that record holder.