Founders Fund is an American San Francisco-based venture capital firm investing in companies building revolutionary technologies. The firm invests at all stages across a wide variety of sectors, including aerospace, artificial intelligence, advanced computing, energy, health, and consumer Internet, with a portfolio that includes Airbnb, Knewton, Lyft, Spotify, Stripe, and ZocDoc. Founders Fund was the first institutional investor in Space Exploration Technologies (SpaceX) and Palantir Technologies, and one of the earliest investors in Facebook. The firm’s four General Partners, Peter Thiel, Ken Howery, Luke Nosek, and Brian Singerman, have been founders and early employees of companies including PayPal, Google, Palantir Technologies, and SpaceX. Formed in 2005, Founders Fund had more than $3 billion in aggregate capital under management as of 2016.