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
165
CompanyStageDateRound SizeTotal Raised
Coco
Series BJun 2025$80M
Series AAug 2021$36M
$120M
Co-investors: Paige Craig (Outlander Labs), Kevin Mahaffey (SNR), Max Altman (Saga), Dick Boyce (TPG), Jeff Kearl (Pelion Venture Partners), Abe Burns, Sam Nazarian, Tom Steyer
Exowatt
Series AApr 2025$35M
SeedApr 2024$20M
$55M
Co-investors: Viviana Faga (Felicis Ventures), Katherine Boyle (Andreessen Horowitz), Aydin Senkut (Felicis Ventures), 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: 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), Dr. E. Bora Uygun (Bora&Sons), Raj Sandhu (Great Oaks Venture Capital), Garry Tan (Y Combinator), Shankar Chandran (Walden Catalyst Ventures), Wolfgang Seibold (Hitachi Ventures), Peter Bordes (Trajectory Ventures), Richard Branson, Jeff Bezos, 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), Lachy Groom (LGF), Thomson Nguyen (Saga), Max Altman (Saga), Ben Braverman (Saga), Elizabeth Weil (Scribble Ventures), 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: Josh Buckley (Buckley Ventures), Reid Hoffman (Greylock), Avichal Garg (Electric Capital), Wei Guo (UpHonest Capital), Zia Huque (Prime Movers Lab), Alexander Piskunov (KAAN Ventures), Jude Gomila (Jude Gomila Rolling Fund), Max Altman (Saga), Luigi Bajetti (LombardStreet Ventures), Matthew Bellamy (Helium-3 Ventures), Eric Lefkofsky (Lightbank), Harshul Sanghi (American Express Ventures), Michael Marks (Celesta), 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)
Beacon AI
Series AAug 2024$15M
SeedOct 2021$5M
$20M
Co-investors: Jackson Moses (Afore Capital), Jim Lockheed (JetBlue Technology Ventures), Zach Perret (Mischief Venture Capital), Lauren Farleigh (Mischief Venture Capital), Jai Malik (Countdown Capital), Greg Sands (Costanoa Ventures), Bradley C. Harrison (Scout Ventures)
President Y Combinator2016 - 2019