Ownership Submission
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 *
LEMMO MARK A
   2. Issuer Name and Ticker or Trading Symbol
InterDigital, Inc. [IDCC] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
EVP, Corp.& Bus. Development
(Last)
(First)
(Middle)
781 THIRD AVENUE		 3. Date of Earliest Transaction (Month/Day/Year)
01/01/2012
(Street)

KING OF PRUSSIA, PA 19406		 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 01/01/2012   F(1)   1,634 D $ 43.57 36,755.7754 D  
Common Stock 01/01/2012   D(2)   0.3463 D $ 43.57 36,755.4291 D  
Common Stock 01/01/2012   A(3)   1,617.5036 A $ 0 38,372.9327 D  
Common Stock 01/01/2012   F(4)   562 D $ 43.57 37,810.9327 D  
Common Stock 01/01/2012   D(5)   0.5036 D $ 43.57 37,810.4291 D  
Common Stock 01/01/2012   A(6)   1,668 A $ 0 39,478.4291 D  
Common Stock               3,578 (7) I By 401(k) Plan

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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

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
LEMMO MARK A
781 THIRD AVENUE
KING OF PRUSSIA, PA 19406		       EVP, Corp.& Bus. Development  

Signatures

 /s/ Claire H. Hanna, Attorney-in-Fact for Mark A. Lemmo   01/04/2012
**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) The transaction reported reflects the withholding of restricted stock units in satisfaction of the reporting person's tax liability. The restricted stock units were part of an award granted to the reporting person on January 1, 2009 pursuant to the company's 1999 Restricted Stock Plan in accordance with the company's Long-Term Compensation Program that vested, in full, on January 1, 2012 together with accrued dividend equivalents.
(2) The transaction reported reflects the cash settlement of a fractional share in connection with the vesting of restricted stock units, as described in Note (1).
(3) The transaction reported represents the vesting of an award of performance-based restricted stock units granted to the reporting person on January 1, 2009 pursuant to the company's 1999 Restricted Stock Plan in accordance with the 2009-2012 cycle under the company's Long-Term Compensation Program. Based on the achievement level of the 2009-2012 cycle performance goals, 31% of the reporting person's target performance-based restricted stock unit award, or 1,605 restricted stock units, vested on January 1, 2012, together with 12.5036 additional shares representing accrued dividend equivalents.
(4) The transaction reported reflects the withholding of restricted stock units in satisfaction of the reporting person's tax liability in connection with the transaction described in Note (3).
(5) The transaction reported reflects the cash settlement of a fractional share in connection with the vesting of restricted stock units, as described in Note (3).
(6) Restricted stock units granted pursuant to the company's 2009 Stock Incentive Plan in accordance with the company's Long-Term Compensation Program.
(7) As of the most recently published account statement, the reporting person beneficially owned this number of whole shares of common stock pursuant to the InterDigital Savings and Protection Plan.

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