Aschenbrenner's AI Hedge Fund Collapses to Fire Sale

Just one day after reports that Leopold Aschenbrenner's hedge fund was seeking fresh capital, the situation escalated into something far more severe. Situational Awareness, the AI-themed hedge fund launched by the former OpenAI researcher, collapsed from roughly $45 billion in assets to around $10 billion after mounting margin calls forced a distressed sale of its entire leveraged public stock portfolio to Ken Griffin's Citadel, according to CNBC's reporting on the collapse, a rapid escalation from the capital search we covered just days earlier.

The fund had used leverage reported as high as 400% to amplify its bets on AI infrastructure, and that leverage is exactly what turned a bad month into a forced liquidation. Public filings showed large positions in Nebius, Bloom Energy, Sandisk, CoreWeave, SharonAI, and IREN as of March 31, according to CNBC's separate analysis of the fund's holdings, all names that were hit hard in the broader AI infrastructure selloff.

Aschenbrenner built his reputation on a 165-page essay published in 2024 that became required reading across Silicon Valley, positioning him as one of the few people who saw the AI transition clearly. Before this month's collapse, Situational Awareness had racked up gains of more than 1,000% since inception, and was up approximately 439% net through June 2026 alone, a track record that made the fund's quarterly filings closely watched for clues on which AI stocks were about to move.

Jerry Diao, who runs a Wall Street coaching firm, offered a blunt postmortem: "A lot of people saw this blow-up as a matter of not if, but when. Maybe his views on AI are correct in the long run, but in the public markets, you have to be prepared for the short-term," according to CNBC's reporting. Critics have separately noted Aschenbrenner had no experience managing money before launching the fund and previously worked at the collapsed crypto firm FTX under Sam Bankman-Fried, details that resurfaced quickly once the fund began unwinding.

Perhaps the most notable detail buried in this collapse is what the fund is reportedly still trying to sell. Prime brokers have also been marketing private-company holdings, including a stake in Anthropic, according to Yahoo Finance's reporting on the unwind. Situational Awareness participated in Anthropic's $65 billion Series H round in May, which valued the company at $965 billion post-money, and Aschenbrenner's own July investor letter had identified a potential Anthropic IPO as a key catalyst for the fund's recovery, a bet that remains unresolved even as the fund's public equities book has already been liquidated.

This collapse is a stark, real-time illustration of the risk embedded in concentrated, leveraged bets on AI infrastructure, even when the underlying thesis about AI's long-term trajectory may prove entirely correct. The distinction between being right about a technology's future and surviving the volatility along the way is exactly what separated Aschenbrenner's fund from a durable, decade-defining investment vehicle.

For businesses and investors evaluating exposure to AI infrastructure names, this collapse is worth treating as a cautionary data point on how quickly leveraged conviction can unwind, independent of whether the fund's underlying AI thesis ultimately holds up.

Leopold Aschenbrenner's Situational Awareness hedge fund collapsed from roughly $45 billion to around $10 billion in assets after margin calls forced a distressed sale of its entire leveraged public stock portfolio to Citadel. The fund had used leverage as high as 400% to amplify concentrated bets on AI infrastructure names including Nebius, CoreWeave, and Bloom Energy. The fund is separately still trying to sell a private stake in Anthropic, which Aschenbrenner's own investor letter had identified as a key catalyst for recovery.