Steve Ballmer, chief executive of Microsoft, has sold $1.3bn (£800m) worth of shares in the firm.
Ballmer disposed of 49.3 million shares in the past week, bringing his total ownership to 358.9 million shares, or 4.2% of the company, according to a filing with the Securities and Exchange Commission. This is the first time he has sold Microsoft stock in seven years.
By submitting your personal information, you agree that TechTarget and its partners may contact you regarding relevant content, products and special offers.
"Even though this is a personal financial matter, I want to be clear about this to avoid any confusion," he said in a statement.
"I am excited about our new products and the potential for our technology to change people's lives, and I remain fully committed to Microsoft and its success."
Ballmer said he hopes to sell up to 75 million shares by year-end.
Bill Gates also sold 1 million of shares, worth $27.2m.