FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * KLASKIN CHRISTINE M   2. Issuer Name and Ticker or Trading Symbol ANTIGENICS INC /DE/ [AGEN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) VP, Finance (Last) (First) (Middle) 162 FIFTH AVE., SUITE 900 3. Date of Earliest Transaction (Month/Day/Year) 07/15/2009 (Street) NEW YORK, NY 10010 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 07/14/2009   A(1) V 66,600 A (1) 95,057 D   Common Stock 07/15/2009   S(2)   7,672 D $ 1.763 87,385 D   Common Stock 07/16/2009   S(2)   19,905 D $ 1.618 67,480 D   Common Stock               195 I by husband

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Underlying Securities (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option, right to buy	$ 13.5	07/16/2009		J(3)			1,000	(3)	07/16/2009	Common Stock	1,000	$ 13.5	189,511	D
Stock Option, right to buy	$ 14.52	07/16/2009		J(3)			1,000	(3)	07/16/2009	Common Stock	1,000	$ 14.52	188,511	D
Stock Option, right to buy	$ 9	07/16/2009		J(3)			5,000	(3)	07/16/2009	Common Stock	5,000	$ 9	183,511	D
Stock Option, Right to buy	$ 8.99	07/16/2009		J(3)			5,000	(3)	07/16/2009	Common Stock	5,000	$ 8.99	178,511	D
Stock Option, right to buy	$ 10.36	07/16/2009		J(3)			6,800	(3)	07/16/2009	Common Stock	6,800	$ 10.36	171,711	D
Stock Option, right to buy	$ 6.3	07/16/2009		J(3)			7,500	(3)	07/16/2009	Common Stock	7,500	$ 6.3	164,211	D
Stock Option, right to buy	$ 5.13	07/16/2009		J(3)			10,000	(3)	07/16/2009	Common Stock	10,000	$ 5.13	154,211	D
Stock Option, right to buy	$ 1.58	07/16/2009		A		27,225		10/16/2009(4)	07/16/2019	Common Stock	27,225	$ 1.58	181,436	D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
KLASKIN CHRISTINE M 162 FIFTH AVE., SUITE 900 NEW YORK, NY 10010			VP, Finance

Signatures

Christine M. Klaskin		07/17/2009
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Represents settlement of restricted stock which was granted on January 14, 2009 in lieu of an annual cash bonus for 2008 performance.
(2)	Represents exclusively, shares sold to cover minimum federal, state and local tax withholding requirement upon the vesting of the restricted shares granted in lieu of a cash bonus for 2008 performance.
(3)	Options cancelled pursuant to terms of the offer by Antigenics Inc. to exchange certain outstanding options granted under the Antigenics 1999 Equity Incentive Plan, as amended for options to be granted under the 2009 Equity Incentive Plan.
(4)	Options vest in 6 equal annual installments over an 18 month period beginning October 16, 2009.

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