Investing Profile

Sam Altman

AngelInvestorFounder
Co-founder and CEO of OpenAI
blog.samaltman.comSan Francisco, California
Photo of Sam Altman, Angel

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Y Combinator Network
38 CONNECTIONS
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Angel
$100K - $5.0M
$1.5M
167
CompanyStageDateRound SizeTotal Raised
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: Paige Craig (Outlander Labs), Kevin Mahaffey (SNR), Jeff Kearl (Pelion Venture Partners), Max Altman (Saga), Dick Boyce (TPG), Abe Burns, Sam Nazarian, Tom Steyer
Exowatt
Series AApr 2025$35M
SeedApr 2024$20M
$110M
Co-investors: Katherine Boyle (Andreessen Horowitz), Aydin Senkut (Felicis Ventures), Viviana Faga (Felicis Ventures), Jack Abraham (Atomic), Rayyan Islam (8090 Industries), Leonardo DiCaprio
Rescale
Series DApr 2025$120M
Series CNov 2021$55M
Series BJul 2018$32M
Series UnknownJul 2015$6M
SeedJan 2012
$270M
Co-investors: Peter Thiel (Founders Fund), Nagraj Kashyap (Softbank Group), Ullas Naik (Streamlined Ventures), Lorenzo Thione (Gaingels), Ron Conway (SV Angel), Ronald Conway Sr. (SV Angel), Chris Dixon (Andreessen Horowitz), Wei Guo (UpHonest Capital), Peter Bordes (Trajectory Ventures), Garry Tan (Y Combinator), Wolfgang Seibold (Hitachi Ventures), Shankar Chandran (Walden Catalyst 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: Joe Lonsdale (8VC), Trae Stephens (Founders Fund), Rob Hayes (First Round Capital), Thomson Nguyen (Saga), Ben Braverman (Saga), Elizabeth Weil (Scribble Ventures), Max Altman (Saga), Lachy Groom (LGF), Jason Citron, Dylan Field, Ron Pragides, Akshay Kothari, Emil Michael
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: Reid Hoffman (Greylock), Avichal Garg (Electric Capital), Josh Buckley (Buckley Ventures), Wei Guo (UpHonest Capital), Michael Marks (Celesta), Zia Huque (Prime Movers Lab), Eric Lefkofsky (Lightbank), Alexander Piskunov (KAAN Ventures), Max Altman (Saga), Luigi Bajetti (LombardStreet Ventures), Matthew Bellamy (Helium-3 Ventures), Jude Gomila (Jude Gomila Rolling Fund), Harshul Sanghi (American Express Ventures), Matt Bellamy, Louis Beryl, Sahin Boydas, Mattia Astori, Michael Moritz, Alexander Gerko, Paul Graham
GALY
Series BSep 2024$33M
$34M
Co-investors: Carmichael Roberts (Breakthrough Energy Ventures), Tim Draper (Draper Associates), Jamie Goldstein (Pillar VC)
President Y Combinator2016 - 2019