Billionaire tech investor Peter Thiel is stepping down from the board of Facebook’s parent company Meta, it was announced on Monday.

This comes after Meta’s stock price dropped 26 percent last Wednesday and the social media giant reported that last quarter, for the first time in its history, it lost daily users.

Thiel was Facebook’s first outside investor, and joined the company’s board in 2005. Meta said he will remain on the board until the next annual meeting. In a statement, Meta Chairman and CEO Mark Zuckerberg said he was “deeply grateful” for everything Thiel has done for Facebook, “from believing in us when few others would, to teaching me so many lessons about business, economics, and the world.”

The conservative Thiel is an enthusiastic supporter of former President Donald Trump, donating to his campaigns and serving as an advisor during his presidency. A person with knowledge of the matter told The Wall Street Journal that Thiel plans on spending the next several months doing what he can to help elect J.D. Vance, a Republican running for Senate in Ohio, and Blake Masters, a Republican running for Senate in Arizona. Masters is president of the Thiel Foundation, while Vance is a partner at a venture capital fund that has invested alongside Thiel.