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Sam Altman Invests $425M in AI and Fusion Startups

12/24/2025

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Summary

Story summary

Sam Altman, former president of Y Combinator, invested heavily in AI-driven security, biotechnology, and nuclear fusion startups in 2025.
Altman invested $425 million in Helion Energy to commercialize zero-carbon fusion by 2028.
Altman backed $8.5 million in MirrorTab, which develops security tools for web applications.
Altman invested $46 million in Campus, an online college offering affordable degrees with AI-generated tools.
Altman backed ConductorAI, which automates government compliance workflows using AI.

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Story summary

Sam Altman, former president of Y Combinator, invested heavily in AI-driven security, biotechnology, and nuclear fusion startups in 2025.
Altman invested $425 million in Helion Energy to commercialize zero-carbon fusion by 2028.
Altman backed $8.5 million in MirrorTab, which develops security tools for web applications.
Altman invested $46 million in Campus, an online college offering affordable degrees with AI-generated tools.
Altman backed ConductorAI, which automates government compliance workflows using AI.