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
61 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: Katherine Boyle (Andreessen Horowitz), Aydin Senkut (Felicis Ventures), Sahin Boydas (Angel investor), Andre De Baubigny (Modern Venture Partners)
Preventive
Series UnknownOct 2025$30M
$30M
Arcadia Medicine
SeedOct 2025$9M
$9M
Coco
Series BJun 2025$80M
Series AAug 2021$36M
$120M
Co-investors: Kevin Mahaffey (Lookout), Paige Craig (Outlander VC), Abe Burns
Rescale
Series DApr 2025$120M
Series CNov 2021$55M
Series BJul 2018$32M
Series UnknownJul 2015$6M
SeedJan 2012
$270M
Co-investors: Chris Dixon (Andreessen Horowitz), Peter Thiel (Founders Fund), Lorenzo Thione (Gaingels), Garry Tan (Initialized Capital), Ullas Naik (Streamlined Ventures), Ron Conway (SV Angel), Wei Guo (UpHonest Capital), Nagraj Kashyap (SoftBank Investment Advisers), Raj Sandhu (Great Oaks Venture Capital), Peter Bordes (Trajectory Ventures), Jeff Bezos, Richard Branson
Campus
Series BMar 2025$46M
Series AMay 2023$29M
$100M
Co-investors: Trae Stephens (Founders Fund), Rob Hayes (First Round Capital), Ben Braverman (Saga), Akshay Kothari
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), Dustin Moskovitz

Sam Altman's Experience

President Y Combinator2016 - 2019