Aschenbrenner's Situational Awareness Hedge Fund Sells Public Portfolio to Citadel After Steep AI Infrastructure Losses

How Aschenbrenner's High-Stakes AI Bet Forced a Sale to Citadel

Leopold Aschenbrenner, the 25-year-old former OpenAI researcher, launched hedge fund Situational Awareness in 2024 with a concentrated thesis: scaling artificial intelligence would demand a massive build-out of semiconductors, memory, energy infrastructure and compute. The fund raised hundreds of millions of dollars from backers including Jane Street, Stripe co-founders Patrick and John Collison, and Meta executives Daniel Gross and Nat Friedman, then deployed that capital in a portfolio of public stocks linked to that AI build-out—and amplified those bets with borrowed money.

That strategy unravelled in recent weeks as investors grew wary that enormous AI-related capital expenditures were not yet translating into near-term revenue. Key holdings such as memory chip producers SK Hynix and SanDisk, clean energy developer Bloom Energy, and neocloud provider Nebius Group each fell more than 30% over the past month. The losses were magnified by leverage, and the fund, which reportedly peaked at a notional value in the tens of billions of dollars, was forced to unwind its public positions.

Ken Griffin's Citadel stepped in to purchase the bulk of those public equities—a familiar move for the firm, which has a reputation for acquiring attractive assets when leveraged players are under duress. Even before this transaction, Citadel already held some of the same names. While Situational Awareness sold its listed stocks, it did not part with its private-company investments, most notably a stake in Anthropic that Bloomberg values at $5 billion. Anthropic, which last raised a Series H round in May, has been reported to be considering a public offering, leaving open the possibility that a future windfall from those shares could partly offset the fund's public-market losses.

Citadel Picks Up the Pieces as the Anthropic Stake Emerges as a Potential Lifeline

Citadel's Strategic Distressed-Asset Play

Citadel's purchase fits a well-established pattern. When leveraged players are forced to sell, Citadel often acts as a liquidity provider, acquiring positions at prices far below their pre-selloff levels. In this case, the acquired stocks are tied to the AI infrastructure build-out—a theme that, if structurally sound over the medium term, could recover sharply once sentiment shifts. By buying from a distressed seller, Citadel locks in a low-cost basis and positions itself for outsized returns if the thesis proves correct. The fact that it already held some of these names suggests Citadel views the sell-down as a pricing anomaly, not a repudiation of the underlying companies.

Anthropic: A $5 Billion Hedge Against Total Collapse

Retaining the Anthropic stake gives Situational Awareness's investors a potential lifeline. Anthropic has been among the most richly valued private AI companies; a successful public listing could allow the fund to monetise its position at a valuation well above the carrying value implied by the $5 billion figure. Yet private markets are also under pressure. If the broader repricing of AI investments extends to pre-IPO rounds, the eventual exit multiple could be lower than hyped. The fund’s ability to hold on to that stake without further liquidity pressure is a crucial element of its recovery path.

The Leverage Trap: When AI Conviction Meets Margin Calls

Aschenbrenner’s background in AI research, not trading, was part of his fund’s allure. But the episode illustrates the danger of pairing a high-conviction macro thesis with large amounts of borrowed money. The same bets that soared on early AI euphoria became unmanageable when the market abruptly questioned the near-term payoff of massive capex. The fund’s attempt to raise fresh capital from August 1—after characterising the selloff as a buying opportunity—failed to attract sufficient commitments, leaving forced liquidation as the only option. This dynamic is a stark reminder that even a correct long-term thesis cannot survive a cash crunch triggered by short-term mark-to-market losses on leveraged positions.

What the Unwind Means for AI-Focused Funds and Private Holdings

• For hedge fund investors: The 30%-plus drawdown in AI infrastructure names and the subsequent forced unwind underscore the risk of concentrated, leveraged bets in sectors where revenue timelines are uncertain. Even funds backed by prominent backers can face acute liquidity crises.
• For other AI-focused funds: The episode is a live stress test. Managers holding a mix of public equities and private AI stakes should re-evaluate their liquidity buffers and margin capacity to avoid a similar forced exit if the current repricing persists.
• For Citadel: The purchase at distressed prices creates a direct path to significant gains if the infrastructure names recover—but that recovery hinges on evidence that AI capex will generate concrete returns, a narrative that remains unproven in the short term.
• For holders of private AI shares: Situational Awareness's unsold Anthropic stake is now a bellwether. If the company proceeds to a public offering, a strong debut could validate the residual value of AI private holdings; a tepid reception would signal that the discount applied to public AI assets is bleeding into private markets.