Stock Facts

Q.	I hold a stock certificate for International Mobile Machines. How do I change it to InterDigital Communications Corporation?
A.	It is not necessary to change an International Mobile Machines stock certificate to an InterDigital Communications Corporation stock certificate. If you would like to change the certificates, contact our Transfer Agent at +1 800 937 5449 or visit www.amstock.com.

Q.

How do I make changes to my InterDigital Communications Corporation account?

A.

If you purchased your shares through a broker, your shares are held in Street name. You need to contact that broker to make changes to your account. If you have your stock certificate, you are a Shareholder of Record. You may contact InterDigital’s transfer agent, American Stock Transfer & Trust, at +1 800 937 5449 or visit www.amstock.com. Be sure to inform the transfer agent if you have a change of address.

Q.	What is the CUSIP for InterDigital’s Common Stock?
A.	InterDigital’s Common Stock CUSIP number is 45866A105.

Q.	Does InterDigital pay a dividend?
A.	InterDigital’s Common Stock does not pay a dividend.

Q.	When was InterDigital’s initial public offering and what was the opening price?
A.	InterDigital went public (as International Mobile Machines Corporation) on November 12, 1981 at an initial price of $3.00 per share.

Q.

Did InterDigital’s stock trade under any symbols other than IDCC?

A.

InterDigital went public (as International Mobile Machines Corporation) on November 12, 1981 and the Company’s Common Stock began trading on the Nasdaq Global Select Market system under the ticker symbol IMMC. On May 26, 1992, Company’s Common stock began trading on the American Stock Exchange under the ticker symbol IMM. In 1992, the Company changed its name to InterDigital Communications Corporation and on October 19, 1992, the Company’s ticker symbol changed to IDC. On April 26, 2000, the Company’s Common Stock began trading on the Nasdaq Global Select Market under the symbol IDCC.