"http://dealbook.blogs.nytimes.com/2008/05/15/paulson-takes-stake-in-yahoo/"

"Another big investor may become a major player in the showdown at Yahoo.

Paulson & Company, the hedge fund that famously bet against subprime mortgages — and earned billions of dollars in the process — holds 50 million shares in Yahoo, according to a regulatory filing. The fund began building up shares around the time that Microsoft made its unsolicited offer for the company in February, people briefed on the matter told DealBook."