X0303 4 2011-01-10 0 0001405495 InterDigital, Inc. IDCC 0001193108 LEMMO MARK A 781 THIRD AVENUE KING OF PRUSSIA PA 19406 0 1 0 0 Exec. VP, Corp. Development Common Stock 2011-01-10 4 S 0 14113 46.14 D 38319 D Common Stock 3381 I By 401(k) Plan The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person. The price reported is the weighted average sale price for the transactions reported. The sale prices ranged from $46.00 to $46.52. Full information about the transactions reported will be provided upon request. 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. /s/ Claire H. Hanna, Attorney-in-Fact for Mark A. Lemmo 2011-01-11