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
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Current Investing Position
Angel
Investment Range
$100K - $5.0M
Sweet Spot
$1.5M
Investments On Record
175

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: Viviana Faga (Felicis Ventures), Katherine Boyle (Andreessen Horowitz), Aydin Senkut (Felicis Ventures), Rayyan Islam (8090 Industries), Jack Abraham (Atomico), Andre De Baubigny (Modern Venture Partners), Leonardo DiCaprio
Preventive
Series UnknownOct 2025$30M
$30M
Arcadia Medicine
SeedOct 2025$9M
$9M
Co-investors: Fred Ehrsam (Paradigm), Dylan Field
Coco
Series BJun 2025$80M
Series AAug 2021$36M
$120M
Co-investors: Max Altman (Saga), Dick Boyce (TPG Biotech), Jeff Kearl (Pelion Venture Partners), Kevin Mahaffey (Lookout), Paige Craig (Outlander VC), Tom Steyer, Sam Nazarian, Abe Burns
Rescale
Series DApr 2025$120M
Series CNov 2021$55M
Series BJul 2018$32M
Series UnknownJul 2015$6M
SeedJan 2012
$280M
Co-investors: Peter Thiel (Founders Fund), Ullas Naik (Streamlined Ventures), Garry Tan (Initialized Capital), Chris Dixon (Andreessen Horowitz), Ron Conway (SV Angel), Lorenzo Thione (Gaingels), Wei Guo (UpHonest Capital), Nagraj Kashyap (SoftBank Investment Advisers), Shankar Chandran (Walden Catalyst Ventures), Dr. E. Bora Uygun (Bora&Sons), Raj Sandhu (Great Oaks Venture Capital), Paulina Szyzdek (E12 Ventures), Peter Bordes (Trajectory Ventures), Wolfgang Seibold (AGIC Capital), Ronald Conway Sr. (NewCo), Jeff Bezos, Paul Graham, Richard Branson
Campus
Series BMar 2025$46M
Series AMay 2023$29M
$100M
Co-investors: Trae Stephens (Founders Fund), Joe Lonsdale (8VC), Rob Hayes (First Round Capital), Elizabeth Weil (Scribble Ventures), Wayee Chu (Reach Capital), Lachy Groom (Physical Intelligence), Max Altman (Saga), Thomson Nguyen (Courant Institute of Mathematical Sciences, New York University), Ben Braverman (Saga), Jason Citron, Emil Michael, Dylan Field, Akshay Kothari, Ron Pragides
Helion Energy
Series FJan 2025$430M
Series ENov 2021$500M
Series DSep 2020$40M
SeedAug 2014$1M
$1.4B
Co-investors: Raviraj Jain (Lightspeed Venture Partners), Brandon Reeves (Lux Capital), Ravi Mhatre (Anthropic), Bill Ford (Fontinalis Partners), Ajay Royan (Mithril Capital Management), Dustin Moskovitz

Sam Altman's Experience

President Y Combinator2016 - 2019