Indexed logomarkindexed.vc

Sam Altman

Individual

OpenAI CEO and prolific angel investor known for early bets on Reddit, Stripe, Airbnb, and Helion Energy.

San Francisco, United States · 40+ investments · 33 portfolio companies

Pre-Seed
Early Stage
Seed
Growth
Artificial Intelligence
Education
Healthcare
Biotech
Energy
Infrastructure
enterprise software
internet hardware
Climate Tech
Fintech
Headquarters
San Francisco, United States
Website
blog.samaltman.com
Portfolio Companies
33
Total Investments
40
Last Investment
May 2026
Geographic Focus
United States

Indexed holds 33 portfolio companies and 40 funding rounds for this investor. The full record is or through the API.

Investment Thesis

Investing in AI, biotechnology, energy, and transformative technologies that will define the future, with concentration in companies solving the world's most important problems.

Sam Altman is an Individual based in San Francisco, United States. It has made 40 investments, including Retro Biosciences, Boom Supersonic and Theorem. Focus areas include Artificial Intelligence and Education.

Portfolio33

Co-investors24

Sign up to view co-investors

24 co-investors across 79 shared portfolio companies — who they back alongside, and how often they lead.

Venture Capital ×13 · Angel Investor ×6 · Corporate VC ×2 · 62 shared rounds

Investment History

Sign up to view investment history

Create a free account with 25 free credits every month, no card needed, to unlock deal history, amounts, and round details.

Your firm? Embed this profile

Add the live badge to your site — it stays current as your portfolio data updates.

Sam Altman on Indexed.vc
<a href="https://indexed.vc/investors/sam-altman"><img src="https://indexed.vc/api/badge/investor/sam-altman" alt="Sam Altman on Indexed.vc" width="260" height="76" /></a>