RMBS Rambus Inc

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

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Rambus Inc.

(Name of Registrant as Specified In Its Charter)

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Your Vote Counts!RAMBUS INC.2025 Annual MeetingVote by April 23, 2025 11:59 PM ETATTN: SECRETARY4453 NORTH FIRST STREET, SUITE 100 SAN JOSE, CALIFORNIA 95134You invested in RAMBUS INC. and it’s time to vote!You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the stockholder meeting to be held on April 24, 2025.Get informed before you voteView the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to April 10, 2025. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy.For complete information and to vote, visit www.ProxyVote.com Control #Smartphone users Vote Virtually at the Meeting*Point your camera here and April 24, 20259:00 a.m. Pacific Timevote without entering a control numberVirtually at: www.virtualshareholdermeeting.com/RMBS2025*Please check the meeting materials for any special requirements for meeting attendance.

Vote at www.ProxyVote.comTHIS IS NOT A VOTABLE BALLOTThis is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters.Board Voting Items Recommends1. Election of Directors. Nominees:1a. Emiko Higashi For1b. Steven Laub For1c. Eric Stang For2. Ratification of KPMG LLP as the Company’s independent registered public accounting firm for the fiscal year ending ForDecember 31, 2025.3. Advisory vote to approve named executive officer compensation. For NOTE: Such other business as may properly come before the meeting or any adjournment or postponement thereof.Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Delivery Settings”.V63569-P25470