Founders Fund is a San Francisco-based venture capital firm established in 2005, specializing in investing across all stages and sectors, including aerospace, artificial intelligence, advanced computing, energy, health, and consumer internet. The firm has approximately $12 billion in assets under management as of 2023. Notable investments include SpaceX, Palantir Technologies, Facebook, Airbnb, Lyft, Spotify, Stripe, and Anduril Industries.

The firm's partners have been founders, early employees, and investors in companies such as PayPal, Google, Palantir Technologies, and SpaceX.