Microsoft Corp. MSFT, +0.25% Chief Executive Satya Nadella sold $35.9 million of the tech titan's stock, according to a Securities and Exchange Commission filing late Friday. The 328,000 shares was not part of a pre-planned stock sale and represents roughly one third of Nadella's previous total holdings. Nadella now holds 778,596 Microsoft shares. The company did not immediately respond to a request for comment. Microsoft stock is up less than 0.1% in after hours trading Friday. It closed down 0.6% to $109 during the regular session as the S&P 500 index SPX, -0.06% dropped 0.7%.