Does he think Microsoft is close to peak valuation or that the markets are frothy?<p>Or maybe he just wants to diversify or buy personal toys and real estate.<p>He still has about $300 million in shares.<p>There also seems to be a potential tax element to it:<p>“Satya sold approximately 840,000 shares of his holdings of Microsoft stock for personal financial planning and diversification reasons,” a Microsoft spokesman said in a written statement. “He is committed to the continued success of the company and his holdings significantly exceed the holding requirements set by the Microsoft Board of Directors.”<p>Analysts said the move could be related to Washington state instituting a 7% tax for long-term capital gains beginning at the start of next year for anything exceeding $250,000 a year.