Icahn was a director of Blockbuster until January 2010 and the chairman of Imclone, Icahn Enterprises, XO Communications, WestPoint Home, Cadus, and American Railcar Industries. He is a beneficial owner of Adventrx Pharmaceuticals, and Vector Group. Icahn also tried to take over Marvel Comics. Icahn, through a subsidiary of his Icahn Enterprises LP, acquired the Fontainebleau property in Las Vegas for about $150 million in February 2010. In March he was one of a group of lenders who purchased Tropicana Casino & Resort Atlantic City, bringing the company out of bankruptcy for $200 million. Also in March he conducted a failed takeover bid for Lionsgate Films. In May he announced ownership of about 12% of Hain Celestial Group, Inc., and the purchase of an 8.54% stake in Lawson Software.
In May 2010, Icahn held a 6.9% stake in Mentor Graphics, increasing to 14 percent in July. Mentor's retaliation with a poison-pill provision failed to deter Icahn who, in February of the next year, made an offer to buy the company for about $1.86 billion in cash.
In 2010, Icahn joined the Giving Pledge list, pledging to give away more than half his fortune, yet has not decided on the specific beneficiaries.