Sam Altman

Sam Altman's investment footprint spans OpenAI (Stargate co-architect), Helion Energy (lead investor in the fusion company most aggressive on commercial timelines), and a network of related plays. His personal capital is a leading indicator of where OpenAI's institutional partnerships go next.

The Helion-Microsoft PPA target of 2028 is the most aggressive commercial fusion timeline in the industry — and Sam is personally exposed if it slips. Watch for additional fusion follow-ons and any SMR investments; if they appear, it'll be a signal about OpenAI's long-term power strategy.