Celldex Therapeutics Inc

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This proxy statement contains information related to the Annual Meeting of Stockholders to be held on June 13, 2024 at 9:00 a.m. Eastern Time. We are holding the Annual Meeting virtually via the Internet. In order to attend our Annual Meeting, you must log in to www.virtualshareholdermeeting.com/CLDX2024 using the 16-digit control number on the notice, proxy card or voting instruction form that accompanied the proxy materials.

Our Annual Meeting could be adjourned or postponed to another date and/or time. A list of record holders of the Company’s common stock entitled to vote at the Annual Meeting will be available for examination by any stockholder, for any purpose germane to the Annual Meeting, at our principal offices at Perryville III Building, 53 Frontage Road, Suite 220, Hampton, New Jersey 08827, during normal business hours for ten days prior to the Annual Meeting.

The enclosed proxy is solicited by the Board of Directors of Celldex Therapeutics, Inc. (the “Board”). The proxy materials relating to the Annual Meeting are being mailed to stockholders entitled to vote at the meeting on or about May 1, 2024.

Important Notice of Availability of Proxy Materials for the Annual Meeting of Stockholders to be held on June 13, 2024.

Our proxy materials, including our Proxy Statement for the 2024 Annual Meeting, 2023 Annual Report to Stockholders (which contains our Annual Report on Form 10-K) and proxy card, are available on the Internet at www.proxyvote.com.