Texas oilman adds another 10 million Yahoo shares to Icahn's causeJoining John Paulson in support of corporate raider Carl Icahn's plot to force a Microsoft-Yahoo merger, Texas oilman and longtime Icahn ally T. Boone Pickens purchased 10 million shares of Yahoo. Pickens told CNBC he plans to support Icahn in a proxy fight. By our count, PIckens's addition puts 30 percent of Yahoo shares in control of those favoring a merger with Microsoft — a merger that Microsoft, having been rebuffed the last time, has yet to propose.