Adeia Inc — Additional Proxy Materials (DEFA14A)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a)

of the Securities Exchange Act of 1934 (Amendment No. __ )

Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

☐ Definitive Proxy Statement

☒ Definitive Additional Materials

☐ Soliciting Material Pursuant to Section 240.14a-12

ADEIA INC.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

☒ No fee required

☐ Fee paid previously with preliminary materials

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

Notice of Annual Meeting

of Stockholders

Thursday, May 7, 2026

10:00 a.m., Pacific Time

The 2026 Annual Meeting of the Stockholders (“Annual Meeting”) of Adeia Inc. (the “Company”) will be held on Thursday, May 7, 2026 at 10:00 a.m. Pacific Time. The Annual Meeting will be held virtually, via live webcast at www.virtualshareholdermeeting.com/ADEA2026. To provide a consistent and convenient experience to all stockholders regardless of location, the Annual Meeting will be held in a virtual meeting format only, via live webcast on the Internet, with no physical in-person meeting. Stockholders virtually attending the Annual Meeting will be afforded the same rights and opportunities to participate as they would at an in-person meeting. We encourage you to attend online and participate in the Annual Meeting, where you will be able to listen to the meeting live, submit questions and vote. The webcast will open 15 minutes before the 10:00 a.m. Pacific Time start of the Annual Meeting and we recommend that you log in early to ensure you are logged in when the Annual Meeting starts.

The Annual Meeting will be held for the following purposes:

These items of business are more fully described in the proxy statement accompanying this notice. The Board of Directors of the Company (the “Board”) has fixed the close of business on March 9, 2026 as the record date for the determination of stockholders entitled to receive notice of, and to vote at, the Annual Meeting, or at any adjournments of the Annual Meeting.

We are pleased to be furnishing proxy materials to stockholders primarily over the Internet. We believe that this process expedites stockholders’ receipt of proxy materials and lowers the costs of printing and distributing our Annual Meeting materials. On or about March 25, 2026, a Notice of Internet Availability of Proxy Materials (the “Notice”) was mailed to our stockholders containing instructions on how to access our 2026 proxy statement and our 2025 Annual Report on Form 10-K, and how to vote online. The Notice also included instructions on how you can receive a copy of your Annual Meeting materials, including the notice of Annual Meeting, proxy statement, and proxy card by mail, via e-mail or by downloading them online. If you choose to receive your Annual Meeting materials by mail, the notice of Annual Meeting, proxy statement from the Board, proxy card and annual report will be enclosed. If you choose to receive your Annual Meeting materials via e-mail, the e-mail will contain voting instructions and links to the annual report and the proxy statement on the Internet, both of which are available at http://www.proxyvote.com and on our website at http://investors.adeia.com. If you access http://www.proxyvote.com using the instructions on the Notice, you will also be given the option to elect to receive future proxy materials by e-mail or in printed form by mail. If you choose to receive future proxy materials by e-mail, you will receive an e-mail next year with instructions containing a link to the annual meeting materials and a link to the proxy voting site. Your election to receive future proxy materials by e-mail or in printed form by mail will remain in effect until you terminate such election.

In order to ensure your representation at the Annual Meeting, you are requested to submit your proxy over the Internet, by telephone or by mail.

All stockholders are cordially invited to attend the Annual Meeting.

voted in the manner directed herein. If no such direction is made, this proxy will be voted in accordance with the Board of Directors' recommendations. Continued and to be signed on reverse side