Sam Altman on Tuesday stated his funding in nuclear power startup Helion, which is deep in talks on an influence buying settlement with OpenAI, has climbed to over $1.6 billion in worth.
That is up from the $375 million he invested within the firm in November 2021, main its Sequence E spherical.
Whereas testifying on the trial over OpenAI’s for-profit ambitions, Altman was offered with a doc he’d signed on April 24. The exhibit gave an unusually clear image of Altman’s monetary standing, exhibiting the worth of his holdings in a slate of buzzy startups.
Altman confirmed on the witness stand that he had a stake in Helion value greater than $1.6 billion as of the tip of 2025. He stated his first funding within the nuclear startup was in 2015, and that he is participated in a number of funding rounds since. He estimated that he owns round a 3rd of the corporate, and stated he additionally owns warrants to buy extra shares.
The exhibit additionally confirmed multimillion-dollar stakes in different tech corporations. It stated Altman owns $632 million of Stripe, the dear fintech startup, and a $258 million stake within the antiaging analysis agency Retro Biosciences. It additionally listed smaller stakes, together with $19 million in Trialspark, a pharmaceutical firm that is rebranded to the identify Formation Bio, and $3 million in Cerebras, an AI chipmaker at the moment making ready its IPO.
Altman’s investments have come into focus on the trial, the place Elon Musk is searching for to show that Altman and different founders have taken to “looting” the charity, which Musk helped begin in 2015, by becoming a member of forces with Microsoft to generate profits from ChatGPT.
Former OpenAI board member Shivon Zilis testified that she was on the board when she first heard a few potential OpenAI deal with Helion. She stated she was involved in regards to the pitch as a result of each Altman and Greg Brockman had been traders.
It “felt tremendous out of left subject,” she stated. “How is it the case that we wish to place a serious guess on a speculative know-how?”
On Tuesday, Musk lawyer Steven Molo grilled Altman a few deliberate energy deal between Helion and OpenAI, and whether or not Altman was enjoying each side of the settlement. Altman stated that he spoke with folks at OpenAI in regards to the deal, however that he recused himself on each side: “I did not signal it, I feel OpenAI signed it.”
“Do you suppose recusal means solely that you just did not signal it?” Molo stated.
“No, I feel recusal means the choice to proceed, and the ultimate approval of phrases,” Altman replied. He stepped down as Helion’s board chair in March 2026.
Molo jumped subsequent to Altman’s ties to Reddit, the place he as soon as briefly served as interim CEO; he additionally constructed up a large stake immediately and in enterprise funds. After establishing that Altman managed someplace within the ballpark of $300 million in Reddit shares round its March 2024 IPO, Molo pointed to a serious content material licensing deal that Reddit and OpenAI introduced a few months later.
“You had an apparent battle in regard to that deal, proper?” Molo requested.
“Sure,” Altman stated. He defined that he went by means of a recusal course of together with his firm, and Molo’s prepare of questions was lower off by the decide’s name for recess.





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