Washington, D.C. 20549
(Rule 14a-101)
Proxy Statement Pursuant to Section 14(a)
of the Securities Exchange Act of 1934
Filed by the Registrant þ
Filed by a Party other than the Registrant o
Check the appropriate box:
o   Preliminary Proxy Statement
o   Confidential, for Use of the Commission Only (as permitted by Rule 14a- 6(e)(2) )
o   Definitive Proxy Statement
þ   Definitive Additional Materials
o   Soliciting Material Pursuant to §240.14a-12
(Name of Registrant as Specified In Its Charter)
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)
Payment of Filing Fee (Check the appropriate box):
þ   No fee required.
o   Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.
  (1)   Title of each class of securities to which transaction applies:
  (2)   Aggregate number of securities to which transaction applies:
  (3)   Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):
  (4)   Proposed maximum aggregate value of transaction:
  (5)   Total fee paid:
o   Fee paid previously with preliminary materials.
o   Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.
  (1)   Amount Previously Paid:
  (2)   Form, Schedule or Registration Statement No.:
  (3)   Filing Party:
  (4)   Date Filed:


*** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting to Be Held on June 2, 2011. INTERDIGITAL, INC. INTERDIGITAL, INC. 781 THIRD AVE. KING OF PRUSSIA, PA 19406-1409 Meeting Information Meeting Type: Annual Meeting For holders as of: April 5, 2011 Date: June 2, 2011 Time: 11:00 AM ET Location: Crowne Plaza Hotel 260 Mall Boulevard King of Prussia, PA 19406 You are receiving this communication because you hold shares in the above named company. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials, which contain important information and are available to you on the Internet or by mail. You may view the proxy materials online at or easily request a paper copy (see reverse side for instructions). We encourage you to access and review all of the information contained in the proxy materials before voting. See the reverse side of this notice to obtain proxy materials and voting instructions. M33119-P11061



Before You Vote How to Access the Proxy Materials Proxy Materials Available to VIEW or RECEIVE: 1. COMBINED DOCUMENT (INCLUDES NOTICE OF MEETING, PROXY STATEMENT AND ANNUAL REPORT) How to View Online: Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX (located on the following page) and visit: How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request: 1) BY INTERNET: 2) BY TELEPHONE: 1-800-579-1639 3) BY E-MAIL*: * If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow XXXX XXXX XXXX (located on the following page) in the subject line. Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before May 19, 2011 to facilitate timely delivery. How To Vote Please Choose One of the Following Voting Methods Vote In Person: Many shareholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares. Vote By Internet: To vote now by Internet, go to Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX (located on the following page) available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card. M33120-P11061



Voting Items The Board of Directors recommends you vote FOR the following: 1. Election of Directors Nominees 01) Gilbert F. Amelio 02) Steven T. Clontz 03) Edward B. Kamins 04) Jean F. Rankin The Board of Directors recommends you vote FOR proposals 2 and 3. 2. Amendment of the articles of incorporation to implement a majority voting standard for all director elections other than contested elections. 3. Approval of advisory resolution on executive compensation. The Board of Directors recommends you vote 1 YEAR on the following proposal: 4. Approval, on an advisory basis, of the frequency of future advisory votes on executive compensation. The Board of Directors recommends you vote FOR the following proposal: 5. Ratification of PricewaterhouseCoopers LLP as the independent registered public accounting firm of InterDigital, Inc. for the year ending December 31, 2011. M33121-P11061