InterDigital Inc (IDCC)

[olddog967]

chinook: If you want historical information for a particular institution you can go to the SEC site and look up the institution's quarterly reports ( SEC Form 13F-HR).

http://www.sec.gov/edgar/searchedgar/companysearch.html

If you want historical listings of institutional ownership for a particular stock, I cannot think of any site. Most of the sites that I am familiar with are essentially on a real time basis, and change their listings as reports are received.