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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1405495	Interdigital Inc.	IDCC	Patent Owners & Lessors (6794)	231882087

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1193108	A Mark Lemmo	781 Third Avenue King Of Prussia PA 19406	Exec. Vp, Corp. Development	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2010-03-11	20,000	$25.25	97,125	No	4	M	Direct
Common Stock	Disposition	2010-03-11	20,000	$27.80	77,125	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Options (Right-to-Buy)	Disposition	2010-03-11	20,000	$0.00	20,000	$25.25

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2010-03-29	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	3,137	Indirect	By 401(k) Plan

Footnotes

The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.
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.
The option became exercisable in two equal installments on December 31, 2000 and June 30, 2001 and was set to expire on March 29, 2010.