OpenAI's Sam Altman Quietly Built $1B Fortune with Big Bets on Stripe, Reddit, Nuclear and Longevity Startups

Sam Altman became famous as CEO of OpenAI but has quietly amassed a $1B personal fortune from startup investments like Reddit, Stripe, and Helion.

Altman invested early in hits like Stripe and Reddit, mainly through his funds Hydrazine Capital and Apollo Projects.

His boldest bets were $375M personally into nuclear startup Helion and $180M into longevity startup Retro Biosciences.

Altman still actively invests in personal capacity despite OpenAI role, with founders citing his decisiveness and connectivity.

His investment strategy aligns with his vision of abundance enabled by AI, with focus areas of energy, biomedicine and further AI companies.