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
163
CompanyStageDateRound SizeTotal Raised
Exowatt
Series AApr 2025$35M
SeedApr 2024$20M
$55M
Co-investors: Viviana Faga (Felicis Ventures), 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: Ullas Naik (Streamlined Ventures), Peter Thiel (Founders Fund), Nagraj Kashyap (Softbank Group), Chris Dixon (Andreessen Horowitz), Ronald Conway Sr. (SV Angel), Lorenzo Thione (Gaingels), Ron Conway (SV Angel), Wei Guo (UpHonest Capital), Wolfgang Seibold (Hitachi Ventures), Garry Tan (Y Combinator), Dr. E. Bora Uygun (Bora&Sons), Raj Sandhu (Great Oaks Venture Capital), Peter Bordes (Trajectory Ventures), Shankar Chandran (Walden Catalyst Ventures), Jeff Bezos, Richard Branson, Paul Graham
Campus
Series BMar 2025$46M
Series AMay 2023$29M
$100M
Co-investors: Joe Lonsdale (8VC), Rob Hayes (First Round Capital), Thomson Nguyen (Saga), Ben Braverman (Saga), Max Altman (Saga), Lachy Groom (LGF), Elizabeth Weil (Scribble Ventures), 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: Reid Hoffman (Greylock), Josh Buckley (Buckley Ventures), Wei Guo (UpHonest Capital), Max Altman (Saga), Luigi Bajetti (LombardStreet Ventures), Zia Huque (Prime Movers Lab), Matthew Bellamy (Helium-3 Ventures), Eric Lefkofsky (Lightbank), Harshul Sanghi (American Express Ventures), Michael Marks (Celesta), Alexander Piskunov (KAAN Ventures), Jude Gomila (Jude Gomila Rolling Fund), Louis Beryl, Matt Bellamy, Sahin Boydas, Mattia Astori, Paul Graham, Alexander Gerko, Michael Moritz
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), Greg Sands (Costanoa Ventures), Bradley C. Harrison (Scout Ventures), Zach Perret (Mischief Venture Capital), Lauren Farleigh (Mischief Venture Capital), Jai Malik (Countdown Capital)
Slope
Series UnknownJul 2024$15M
Series ASep 2023$30M
$77M
Co-investors: Marcelo Lima (monashees), Rebecca Kaden (Union Square Ventures), John Buttrick (Union Square Ventures), Darian Shirazi (Gradient Ventures), Donald Stalter (Global Founders Capital), Jack Altman (Alt Capital), Jared Friedman (Y Combinator), Surbhi Sarna (Y Combinator), Brad Flora (Y Combinator), Max Altman (Saga), David Helgason (foobar.vc), Alex Bouaziz (Sarona Ventures), Drew Houston, Arash Ferdowsi, Stanley Tang, William Hockey, Tim Griffin, Eric Wu, Mathilde Collin
President Y Combinator2016 - 2019