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
159
CompanyStageDateRound SizeTotal Raised
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), Nagraj Kashyap (Softbank Group), Peter Thiel (Founders Fund), Ullas Naik (Streamlined Ventures), Ron Conway (SV Angel), Ronald Conway Sr. (SV Angel), Lorenzo Thione (Gaingels), Wei Guo (UpHonest Capital), Peter Bordes (Trajectory Ventures), Garry Tan (Y Combinator), Raj Sandhu (Great Oaks Venture Capital), Dr. E. Bora Uygun (Bora&Sons), Wolfgang Seibold (Hitachi Ventures), Shankar Chandran (Walden Catalyst 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), Max Altman (Saga), Lachy Groom (LGF), Elizabeth Weil (Scribble Ventures), Jason Citron, Emil Michael, Dylan Field, Akshay Kothari, Ron Pragides
Helion Energy
Series FJan 2025$430M
Series ENov 2021$500M
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), Luigi Bajetti (LombardStreet Ventures), Eric Lefkofsky (Lightbank), Zia Huque (Prime Movers Lab), Harshul Sanghi (American Express Ventures), Max Altman (Saga), Michael Marks (Celesta), Matthew Bellamy (Helium-3 Ventures), Alexander Piskunov (KAAN Ventures), Jude Gomila (Jude Gomila Rolling Fund), Alexander Gerko, Michael Moritz, Paul Graham, Sahin Boydas, Matt Bellamy, Louis Beryl, Mattia Astori
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), Bradley C. Harrison (Scout Ventures), Zach Perret (Mischief Venture Capital), Lauren Farleigh (Mischief Venture Capital), Jai Malik (Countdown Capital), Jim Lockheed (JetBlue Technology Ventures), Greg Sands (Costanoa Ventures)
Slope
Series UnknownJul 2024$15M
Series ASep 2023$30M
$77M
Co-investors: John Buttrick (Union Square Ventures), Marcelo Lima (monashees), Rebecca Kaden (Union Square Ventures), Darian Shirazi (Gradient Ventures), Donald Stalter (Global Founders Capital), Jack Altman (Alt Capital), Jared Friedman (Y Combinator), Max Altman (Saga), David Helgason (foobar.vc), Alex Bouaziz (Sarona Ventures), Surbhi Sarna (Y Combinator), Brad Flora (Y Combinator), Mathilde Collin, Drew Houston, Arash Ferdowsi, Stanley Tang, William Hockey, Tim Griffin, Eric Wu
ValueBase
SeedJun 2024$6M
Pre SeedFeb 2023$2M
$8M
Co-investors: Erik Torenberg (Village Global), Julian Weisser (Kepler Operator’s Fund), Nat Friedman (C2 Investment), Sahil Lavingia
President Y Combinator2016 - 2019