X0303 4 2011-01-03 0 0001098972 ANTIGENICS INC /DE/ AGEN 0001274775 HATSOPOULOS JOHN ANTIGENICS 3 FORBES ROAD LEXINGTON MA 02421 1 0 0 0 Deferred Shares 2011-01-03 4 A 0 11291.646 0.952 A Common Stock 11291.646 203243.265 D Acquired under the Antigenics Inc. Deferred Compensation Plan, as amended. Deferred Shares represent an equal amount of shares of the Company's common stock to be distributed with the terms of the Plan, typically once the director ceases to serve as a director of the Company. Christine M. Klaskin, by Power of Attorney 2011-01-05