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
63 CONNECTIONS

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Current Investing Position
Angel
Investment Range
$100K - $5.0M
Sweet Spot
$1.5M
Investments On Record
172

Sam Altman is on these Sector & Stage Rankings

Sam Altman's Investments On Record (128)

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), Aydin Senkut (Felicis Ventures), Katherine Boyle (Andreessen Horowitz), Jack Abraham (Atomico), Sahin Boydas (Angel investor), 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: Jeff Kearl (Pelion Venture Partners), Paige Craig (Outlander VC), Dick Boyce (TPG), Kevin Mahaffey (Lookout), Sam Nazarian, Tom Steyer, Abe Burns
Rescale
Series DApr 2025$120M
Series CNov 2021$55M
Series BJul 2018$32M
Series UnknownJul 2015$6M
SeedJan 2012
$270M
Co-investors: Garry Tan (Initialized Capital), Peter Thiel (Founders Fund), Ullas Naik (Streamlined Ventures), Chris Dixon (Andreessen Horowitz), Ron Conway (SV Angel), Lorenzo Thione (Gaingels), Wei Guo (UpHonest Capital), Nagraj Kashyap (SoftBank Investment Advisers), Ronald Conway Sr. (NewCo), Shankar Chandran (Walden Catalyst Ventures), Peter Bordes (Trajectory Ventures), Dr. E. Bora Uygun (Bora&Sons), Raj Sandhu (Great Oaks Venture Capital), Jeff Bezos, 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), Thomson Nguyen (Courant Institute of Mathematical Sciences, New York University), Ben Braverman (Saga), Elizabeth Weil (Scribble Ventures), Lachy Groom (Stripe), Jason Citron, Dylan Field, Ron Pragides, Akshay Kothari, Emil Michael
Helion Energy
Series FJan 2025$430M
Series ENov 2021$500M
Series DSep 2020$40M
SeedAug 2014$1M
$970M
Co-investors: Raviraj Jain (Lightspeed Venture Partners), Ravi Mhatre (Lightspeed Venture Partners), Ajay Royan (Mithril Capital Management), Dustin Moskovitz

Sam Altman's Experience

President Y Combinator2016 - 2019