Thiel sold over $1 billion worth of Palantir stock over the last few days of September and the first day of October, according to Securities and Exchange Commission ( SEC) filings. Those sales came after the company officially joined the S&P 500 on Sept. 23. Thiel also shed about $400 million worth of Palantir stock earlier this year.

Peter Thiel sold almost $600 million of Palantir Technologies Inc. stock this week, bringing his total disposals this year to more than $1 billion. He sold more than 16 million shares over three days this week, according to a regulatory filing, adding to the 20 million shares he sold in March and May.

Palantir Technologies, Inc. (NYSE:PLTR) stock may not have seen explosive growth but it has become a quite favorite with retail investors and as the company celebrates its fourth anniversary as a public company,

Co-founder and Chairman Peter Thiel sold 12.4 million Palantir shares. His trading plan is now out of stock to sell.