|Headquarters||Letterman Digital Arts Center
San Francisco, California
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 $2 billion in aggregate capital under management as of 2014.
The firm was organized by Peter Thiel, Ken Howery, and Luke Nosek in early 2005 and raised its first fund of $50 million from individual entrepreneurs and angel investors in January of that year. Sean Parker, an early employee of Napster and ex-president of Facebook, joined in 2006. In 2007, the firm raised a new fund of $220 million.
In 2014, Founders Fund raised a $1 billion fifth suite of funds, bringing the firm's aggregate capital under management to more than $2 billion. 
As of the fall of 2014, the firm was made up of the following partners:
- Peter Thiel, founder and former CEO and chairman of PayPal
- Ken Howery, founder and former CFO of PayPal
- Luke Nosek, founder and former vice president of PayPal
- Brian Singerman, creator of iGoogle
- biotechnology and health
- consumer Internet and media
- advanced machines and artificial intelligence
- aerospace and transportation
- analytics and software
Some of the firm's investments include Facebook, SpaceX, Spotify, Palantir Technologies, Airbnb, Lyft, Yammer, Stripe, 140 Proof, Knewton, Practice Fusion, Quantcast, Nanotronics Imaging, ZocDoc, Planet Labs, Pathway Genomics, Vicarious Systems, Flexport and Transatomic Power.
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- Jessica Guynn (December 18, 2007). "Facebook backer now a rival to venture capitalists". Los Angeles Times. Archived from the original on 2007-12-19. Retrieved 2007-11-23.
- Founders Fund raises $250M vehicle (July 19, 2010). "Founders Fund raises $250M vehicle". San Francisco Business Times. Retrieved August 27, 2013.
- Founders Fund Closes Fourth Suite of Funds - SAN FRANCISCO, Dec. 1, 2011 /PRNewswire/. Prnewswire.com (2011-12-01). Retrieved on 2013-10-23.
- Rusli, Evelyn M. (December 1, 2011). "Peter Thiel's Founders Fund Raises $625 Million". New York Times.
- VentureBeat (March 5, 2014). "Founders Fund raises a big $1B fund to plunk into startups". VentureBeat. Retrieved September 16, 2014.
- "Founders Fund Closes Fourth Suite of Funds". PRNewswire. December 1, 2011.
- Founders Fund. Founders Fund. Retrieved on 2013-10-23.
- Gray, Kevin. "Peter Thiel Goes Nuclear". Popular Science. Retrieved 20 February 2016.
- Arrington, Michael (December 17, 2007). "Founders Fund Closes $220 Million Second Fund". TechCrunch.
- Founders Fund (official website)