Investing Profile

Sam Altman

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

Signal uses Gmail to reveal intro paths. Email content is never read.

Sign in with Google →
Y Combinator Network
37 CONNECTIONS
cb
Angel
$100K - $5.0M
$1.5M
161
CompanyStageDateRound SizeTotal Raised
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: Ronald Conway Sr. (SV Angel), Nagraj Kashyap (Softbank Group), Chris Dixon (Andreessen Horowitz), Ullas Naik (Streamlined Ventures), Peter Thiel (Founders Fund), Lorenzo Thione (Gaingels), Ron Conway (SV Angel), Wei Guo (UpHonest Capital), Shankar Chandran (Walden Catalyst Ventures), Raj Sandhu (Great Oaks Venture Capital), Garry Tan (Y Combinator), Wolfgang Seibold (Hitachi Ventures), Peter Bordes (Trajectory Ventures), Dr. E. Bora Uygun (Bora&Sons), Paul Graham, Jeff Bezos, Richard Branson
Campus
Series BMar 2025$46M
Series AMay 2023$29M
$100M
Co-investors: Joe Lonsdale (8VC), Trae Stephens (Founders Fund), Rob Hayes (First Round Capital), Max Altman (Saga), Lachy Groom (LGF), Elizabeth Weil (Scribble Ventures), Dylan Field, Jason Citron, Emil Michael, 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: Josh Buckley (Buckley Ventures), Avichal Garg (Electric Capital), Reid Hoffman (Greylock), 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), 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), 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: Rebecca Kaden (Union Square Ventures), Darian Shirazi (Gradient Ventures), Marcelo Lima (monashees), John Buttrick (Union Square Ventures), Donald Stalter (Global Founders Capital), Surbhi Sarna (Y Combinator), Brad Flora (Y Combinator), Jack Altman (Alt Capital), Jared Friedman (Y Combinator), Max Altman (Saga), David Helgason (foobar.vc), Alex Bouaziz (Sarona Ventures), Mathilde Collin, Drew Houston, Arash Ferdowsi, Stanley Tang, William Hockey, Tim Griffin, Eric Wu
President Y Combinator2016 - 2019