Investing Profile

Sam Altman

AngelInvestorFounder

Co-founder and CEO of OpenAI

blog.samaltman.comSan Francisco, California

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Networks Sam is a member of

Y Combinator Network

38 CONNECTIONS

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Current Investing Position

Angel

Investment Range

$100K - $5.0M

Sweet Spot

$1.5M

Investments On Record

171

Sam Altman is on these Sector & Stage Rankings

Games (Seed)Insurance (Seed)TransportationTech (Seed)EnergyTech (Seed)Web3/Blockchain (Seed)AI (Seed)Investors who invested in female founders Web3/Crypto (Seed)San Francisco Bay Area Angel, Scout, and Solo-Capitalists Generative Tech/AI (Seed)SaaS (Seed)

Sam Altman's Investments On Record (127)

Company	StageDateRound Size	Total Raised
Red Queen Bio	SeedNov 2025$15M	$15M
Exowatt	Series ANov 2025$50M Series AApr 2025$35M SeedApr 2024$20M	$110M
Co-investors: Aydin Senkut (Felicis Ventures), Katherine Boyle (Andreessen Horowitz), Viviana Faga (Felicis Ventures), Jack Abraham (Atomic), Andre De Baubigny (Modern Venture Partners), Rayyan Islam (8090 Industries), Leonardo DiCaprio
Arcadia Medicine	SeedOct 2025$9M	$9M
Co-investors: Fred Ehrsam (Paradigm), Dylan Field
Coco	Series BJun 2025$80M Series AAug 2021$36M	$120M
Co-investors: Jeff Kearl (Pelion Venture Partners), Paige Craig (Outlander Labs), Max Altman (Saga), Kevin Mahaffey (SNR), Dick Boyce (TPG), Tom Steyer, Sam Nazarian, Abe Burns
Rescale	Series DApr 2025$120M Series CNov 2021$55M Series BJul 2018$32M Series UnknownJul 2015$6M SeedJan 2012	$270M
Co-investors: Nagraj Kashyap (Softbank Group), Chris Dixon (Andreessen Horowitz), Peter Thiel (Founders Fund), Lorenzo Thione (Gaingels), Ron Conway (SV Angel), Ullas Naik (Streamlined Ventures), Ronald Conway Sr. (SV Angel), Wei Guo (UpHonest Capital), Garry Tan (Y Combinator), Shankar Chandran (Walden Catalyst Ventures), Peter Bordes (Trajectory Ventures), Wolfgang Seibold (Hitachi Ventures), Dr. E. Bora Uygun (Bora&Sons), Raj Sandhu (Great Oaks Venture Capital), Jeff Bezos, Richard Branson, Paul Graham
Campus	Series BMar 2025$46M Series AMay 2023$29M	$100M
Co-investors: Trae Stephens (Founders Fund), Joe Lonsdale (8VC), Rob Hayes (First Round Capital), Elizabeth Weil (Scribble Ventures), Lachy Groom (LGF), Thomson Nguyen (Saga), Ben Braverman (Saga), Max Altman (Saga), Akshay Kothari, Jason Citron, Emil Michael, Dylan Field, Ron Pragides
Helion Energy	Series FJan 2025$430M Series ENov 2021$500M Series DSep 2020$40M SeedAug 2014$1M	$970M
Co-investors: Ravi Mhatre (Lightspeed Venture Partners), Dustin Moskovitz
Boom Supersonic	Series ADec 2024$100M Series BApr 2019$100M Series AMar 2017$33M SeedMar 2016$6M	$330M
Co-investors: Avichal Garg (Electric Capital), Josh Buckley (Buckley Ventures), Reid Hoffman (Greylock), Wei Guo (UpHonest Capital), Eric Lefkofsky (Lightbank), Alexander Piskunov (KAAN Ventures), Jude Gomila (Jude Gomila Rolling Fund), Harshul Sanghi (American Express Ventures), Michael Marks (Celesta), Zia Huque (Prime Movers Lab), Max Altman (Saga), Luigi Bajetti (LombardStreet Ventures), Matthew Bellamy (Helium-3 Ventures), Louis Beryl, Michael Moritz, Alexander Gerko, Paul Graham, Mattia Astori, Sahin Boydas, Matt Bellamy