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
108 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), Rayyan Islam (8090 Industries), Jack Abraham (Atomico), Andre De Baubigny (Modern Venture Partners), 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), Jeff Kearl (Pelion Venture Partners), Paige Craig (Outlander VC), Sam Nazarian (sbe Lifestyle Hospitality), Dick Boyce (TPG Biotech), Kevin Mahaffey (Lookout), Abe Burns, Tom Steyer
Rescale
Series DApr 2025$120M
Series CNov 2021$55M
Series BJul 2018$32M
SeedJul 2015$6M
SeedJan 2012
$270M
Co-investors: Garry Tan (Initialized Capital), Ullas Naik (Streamlined Ventures), Lorenzo Thione (Gaingels), Wei Guo (UpHonest Capital), Ron Conway (Angel Investors LP Funds), Peter Thiel (The Founders Fund), Chris Dixon (Curated), Nagraj Kashyap (SoftBank Investment Advisers), Shankar Chandran (Samsung Catalyst Fund), Dr. E. Bora Uygun (Planet Ventures Inc.), Raj Sandhu (Great Oaks Venture Capital), Peter Bordes (Trajectory Ventures), Wolfgang Seibold (AGIC Capital), Ronald Conway Sr. (NewCo), 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), Elizabeth Weil (Andreessen Horowitz), Rob Hayes (First Round Capital), Wayee Chu (Reach Capital), Lachy Groom (Physical Intelligence), Dylan Field (Figma, Inc.), Ron Pragides (GTMFund), Max Altman (Saga), Thomson Nguyen (Courant Institute of Mathematical Sciences, New York University), Ben Braverman (Saga), Emil Michael, Akshay Kothari, Jason Citron
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 (Kamanu Ventures & Lightspeed Venture Partners Scout), Bill Ford (Fontinalis Partners), Ajay Royan (Mithril Capital Management LLC), Dustin Moskovitz

Sam Altman's Experience

President Y Combinator2016 - 2019

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