Safe Harbor Statement Under the Private Securities Litigation Reform Act of 1995: This announcement contains " forward-looking statements" such as those, among others, relating to Celldex's expectations regarding the completion and timing of the closing of the public offering and its anticipated use of net proceeds from the offering. These statements are subject to significant risks and uncertainties; actual results could differ materially from those projected and Celldex cautions investors not to place undue reliance on the forward-looking statements contained in this release. These risks and uncertainties include, without limitation, risks and uncertainties related to market conditions and satisfaction of customary closing conditions related to the underwriters' option to purchase additional shares. There can be no assurance that Celldex will be able to complete the public offering on the anticipated terms, or at all. Risks and uncertainties relating to Celldex and its business can be found in the "Risk Factors" section of Celldex's Form 10-K, filed with the SEC on March 8, 2012, and in the prospectus supplement and related prospectus relating to the proposed offering filed with the SEC on February 4, 2013. Celldex undertakes no duty or obligation to update any forward-looking statements contained in this release as a result of new information, future events or changes in Celldex's expectations.

CONTACT: Sarah Cavanaugh         Vice President of IR & Corp Communications         Celldex Therapeutics, Inc.         (781) 433-3161         scavanaugh@celldextherapeutics.com

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