The chief executive officer of Red Hat Inc. sold another $4.1 million in company stock on Monday, according to a filing with the Securities and Exchange Commission.

James Whitehurst sold 47,608 shares at prices ranging from $87.68 to $88.35 on Monday, according to the filing. He still owns more than 397,000 shares in the open source software company that is worth approximately $35 million.

Whitehurst has been selling shares regularly in recent months. On April 20, he sold 26,250 shares of the company’s stock at an average price of $86.85, for a total value of $2.3 million.

And in late March, he sold sold 12,000 shares of company stock at a price of $86.50 per share.

Whitehurst has worked for Red Hat since joining in 2008. During his tenure with the company, Red Hat was added to the S&P 500 index, more than doubled its revenue, and was named to Forbes’ list of “The World’s Most Innovative Companies” in 2015.

Red Hat’s shares closed Tuesday at $88.18, down 11 cents.

Note: This story is from the North Carolina Business News Wire, a service of UNC-Chapel Hill’s School of Media and Journalism