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
37 CONNECTIONS
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Angel
$100K - $5.0M
$1.5M
167
CompanyStageDateRound SizeTotal Raised
Arcadia Medicine
SeedOct 2025$9M
$9M
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
Exowatt
Series AApr 2025$35M
SeedApr 2024$20M
$55M
Co-investors: Viviana Faga (Felicis Ventures), Aydin Senkut (Felicis Ventures), Katherine Boyle (Andreessen Horowitz), Jack Abraham (Atomic), Leonardo DiCaprio
Rescale
Series DApr 2025$120M
Series CNov 2021$55M
Series BJul 2018$32M
Series UnknownJul 2015$6M
SeedJan 2012
$270M
Co-investors: Chris Dixon (Andreessen Horowitz), Peter Thiel (Founders Fund), Nagraj Kashyap (Softbank Group), Lorenzo Thione (Gaingels), Ron Conway (SV Angel), Ronald Conway Sr. (SV Angel), Ullas Naik (Streamlined Ventures), 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, Paul Graham, Richard Branson
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), Ron Pragides, Akshay Kothari, Jason Citron, Emil Michael, Dylan Field
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), Matthew Bellamy (Helium-3 Ventures), 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), Louis Beryl, Michael Moritz, Alexander Gerko, Paul Graham, Mattia Astori, Matt Bellamy, Sahin Boydas
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