A 24-year-old former OpenAI researcher built one of Wall Street's biggest new hedge funds on an AI bet. Miami's own Citadel just cleaned up the wreckage.
Leopold Aschenbrenner launched Situational Awareness in 2024, named after the 165-page manifesto that made him Silicon Valley famous. The fund paired aggressive long positions in AI hardware stocks with shorts against software companies.
A Bet That Worked, Until It Didn't
Through June, that bet had returned 439% for the year. Assets under management hit roughly $45 billion by early July.
Then AI hardware names including SK Hynix, Nebius and CoreWeave fell sharply. The fund's software shorts moved against it at the same time. Just a week earlier, Aschenbrenner had told investors the selloff looked like a buying opportunity.
Instead, the fund lost roughly 67% of its value in July. Prime brokers Bank of America, Goldman Sachs and JPMorgan Chase pushed for margin calls to be met fast.
"We let you down this month," Aschenbrenner wrote to investors, taking what he called full responsibility.
Miami's Own Fund Steps In
Ken Griffin's Citadel bought roughly $16 billion of Situational Awareness's public holdings, reportedly at close to a 10% discount. Citadel is headquartered in Miami, where Griffin relocated the firm from Chicago in 2022.
Citadel then moved fast. It resold more than 80% of that exposure through nearly 100 block trades worth over $4 billion, according to reports.
24/7 Wall St called the sequence a "master class," pointing to Griffin's ability to provide liquidity under pressure, then quickly cut his own exposure once conditions shifted.
Situational Awareness survived. It retained roughly $10 billion in assets, including private stakes such as Anthropic. The fund says it will stop borrowing from banks to leverage public market bets.
The Tower Behind the Trade
Citadel's Miami footprint goes well beyond this one trade. The firm is building a 54-story, roughly $1 billion headquarters tower at 1201 Brickell Bay Drive. It's expected to become one of the tallest buildings on the Miami skyline.
Griffin's presence in Miami isn't limited to office towers either. In 2024, he donated $50 million to Baptist Health's Miami Neuroscience Institute. The gift helped establish a center for neurological care and research at the Kendall hospital.
What the Trade Signals
Griffin's Citadel didn't out-forecast Aschenbrenner's AI thesis. It had the capital and liquidity to act once his fund had no other options left.
For Miami's growing hedge fund and family office community, that's the more durable lesson than any single quarter's returns. Conviction alone doesn't survive a margin call. Capital positioned to act when others can't, does.
