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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Networks Sam is a member of
Y Combinator Network
160 CONNECTIONS

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Current Investing Position
Angel
Investment Range
$100K - $5.0M
Sweet Spot
$1.5M
Investments On Record
176

Sam Altman is on these Sector & Stage Rankings

Sam Altman's Investments On Record (131)

CompanyStageDateRound SizeTotal Raised
Red Queen Bio
SeedNov 2025$15M
$15M
Exowatt
Series ANov 2025$50M
Series AApr 2025$35M
SeedApr 2024$20M
$110M
Co-investors: Aydin Senkut (Felicis Ventures), Katherine Boyle (Andreessen Horowitz), Viviana Faga (Felicis Ventures), Tristan Schaeffer (Worldview Capital), Rayyan Islam (8090 Industries), Jack Abraham (Atomico), Andre De Baubigny (MVP Ventures), Leonardo DiCaprio (Unknown Ventures)
Preventive
Series UnknownOct 2025$30M
$30M
Arcadia Medicine
SeedOct 2025$9M
$9M
Co-investors: Fred Ehrsam (Paradigm), Dylan Field (Figma, Inc.)
Coco
Series BJun 2025$80M
Series AAug 2021$36M
$120M
Co-investors: Max Altman (Saga Ventures), Sam Nazarian (sbe Lifestyle Hospitality), Tom Steyer (Galvanize Climate Solutions LLC), Dick Boyce (TPG Biotech), Jeff Kearl (Pelion Venture Partners), Kevin Mahaffey (Lookout), Paige Craig (Outlander VC), Abe Burns
Rescale
Series DApr 2025$120M
Series CNov 2021$55M
Series BJul 2018$32M
SeedJul 2015$6M
SeedJan 2012
$270M
Co-investors: Ullas Naik (Streamlined Ventures), Lorenzo Thione (Gaingels), Wei Guo (UpHonest Capital), Nagraj Kashyap (SoftBank Investment Advisers), Garry Tan (Y Combinator), Peter Thiel (The Founders Fund), Chris Dixon (Curated), Ron Conway (Angel Investors LP Funds), Shankar Chandran (Samsung Catalyst Fund), Dr. E. Bora Uygun (Planet Ventures Inc.), Raj Sandhu (Great Oaks Venture Capital), Peter Bordes (Trajectory Ventures), Wolfgang Seibold (Hitachi Ventures), Ronald Conway Sr. (NewCo), Jeff Bezos, Paul Graham, Richard Branson
Campus
Series BMar 2025$46M
Series AMay 2023$29M
$100M
Co-investors: Joe Lonsdale (8VC), Elizabeth Weil (Andreessen Horowitz), Trae Stephens (Founders Fund), Rob Hayes (First Round Capital), Wayee Chu (Reach Capital), Lachy Groom (Physical Intelligence), Dylan Field (Figma, Inc.), Ron Pragides (GTMFund), Max Altman (Saga Ventures), Thomson Nguyen (Saga Ventures), Akshay Kothari (Sdl Ventures), Ben Braverman (Saga), Jason Citron, Emil Michael
Helion Energy
Series FJan 2025$430M
Series ENov 2021$500M
Series DSep 2020$40M
SeedAug 2014$1M
$1.4B
Co-investors: Brandon Reeves (Lux Capital), Ravi Mhatre (Kamanu Ventures & Lightspeed Venture Partners Scout), Bill Ford (Fontinalis Partners), Ajay Royan (Mithril Capital Management LLC), Raviraj Jain (Kamanu Ventures & Lightspeed Venture Partners Scout), Dustin Moskovitz

Sam Altman's Experience

President Y Combinator2016 - 2019

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