元 OpenAI 研究者が設立した AI ヘッジファンド、株式売却も Anthropic 株は保有

Situational Awareness, a hedge fund formed by former OpenAI researcher Leopold Aschenbrenner, has sold the majority of its public stock portfolio to Ken Griffin’s Citadel following steep losses over the past month, The Wall Street Journal reported earlier on Thursday. It’s a big comedown for the rising star who has been described as both “scarily smart,” and “brash.”

German-born Aschenbrenner, who is 25, had no prior trading experience before launching the fund in 2024. He gained prominence for his investment thesis after publishing essays arguing that scaling AI would require a major build-up in semiconductors, compute, memory, and energy infrastructure.

He joined OpenAI’s “superalignment” team in 2023, two years after graduating as valedictorian from Columbia at 19 (he enrolled at age 15). But he was dismissed from the company a year later over what it described as an improper disclosure of internal information. At the time, that team was led by OpenAI co-founder Ilya Sutskever and AI researcher Jan Leike. Soon after, Sutskever left to start his own company, Leike joined rival Anthropic, and Aschenbrenner launched his fund.

Things couldn’t have been going better for Situational Awareness until very recently. The fund returned 439% for the year through June, Financial Times reported. Assets under management reportedly grew to as much as $45 billion during their peak before the fund’s positions began dropping sharply amid a broader decline in AI infrastructure investments, CNBC reported.

Even after losses mounted, Aschenbrenner didn’t flinch. In a July 24 letter to investors seen by FT, he called the selloff one of the best buying opportunities since early last year and invited clients to commit fresh capital starting August 1. According to Bloomberg, the appeal didn’t garner the commitments he’d hoped would materialize.

Some of the hardest-hit stocks held by the fund included memory chip producers SK Hynix and Sandisk, clean energy developer Bloom Energy, and neocloud provider Nebius Group, all of which have plummeted by more than 30% over the past month. AI infrastructure equities fell as public investors grew concerned that massive capital expenditures weren’t translating into near-term revenue. The fund’s losses were amplified by leverage, a common hedge fund strategy of using borrowed money to buy stocks.

After Citadel bought the bulk of those holdings, Situational Awareness’ overall assets fell to roughly $10 billion, Bloomberg reported, down from around $20 billion in recent months, per an earlier WSJ report.

Situational Awareness raised several hundred million dollars at its outset. Early backers of the fund include quant-trading firm Jane Street, Stripe co-founders Patrick and John Collison, and Meta executives Daniel Gross and Nat Friedman.

Citadel’s purchase fits a familiar pattern for Citadel. Ken Griffin’s hedge fund has a reputation for stepping in to snap up attractive assets when leveraged players are having to unwind themselves. Even before picking up some of Situational Awareness’ holdings, Citadel’s portfolio featured some of the same AI infrastructure bets, suggesting that, like Aschenbrenner, Griffin expects the sector to recover and has the ability to wait it out.

Situational Awareness did not, however, sell its investments in private companies, according to multiple reports. Most notably, it continues to hold a stake in Anthropic that’s right now valued at $5 billion, according to Bloomberg, and which many would view as an asset that continues to appreciate. Indeed, Anthropic was last valued at $965 billion in a Series H round in May, and it’s expected to go public as soon as October, potentially at an even higher valuation. It’s conceivable that a windfall from the sale of those shares could offset some of the hedge fund’s public-market losses.

Other private investments in the portfolio of Situational Awareness include chipmaker MatX and AI data center startup Fluidstack, which was reportedly in talks in April to raise a new round at an $18 billion valuation.

TechCrunch has reached out to Aschenbrenner for comment.

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Marina Temkin is a venture capital and startups reporter at TechCrunch. Prior to joining TechCrunch, she wrote about VC for PitchBook and Venture Capital Journal. Earlier in her career, Marina was a financial analyst and earned a CFA charterholder designation.

You can contact or verify outreach from Marina by emailing marina.temkin@techcrunch.com or via encrypted message at +1 347-683-3909 on Signal.

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