The Numbers Come First
Leopold Aschenbrenner built Situational Awareness into a $45 billion fund on a concentrated, leveraged bet — three to four dollars borrowed for every dollar of capital — on memory chip and data center names including CoreWeave and SK Hynix. For two years, the thesis printed money. Then the week of his wedding, it nearly printed ruin.
Traders agitated over AI infrastructure spending without clear returns pushed memory stocks and Big Tech names like SK Hynix and SanDisk down 30%. The semiconductor sector logged its worst month since 2002, according to Fortune's reporting. Rival traders identified Aschenbrenner's positions and shorted them, betting he would be forced to sell. Banks demanded more collateral. He sold stock to meet the calls, which pushed prices lower still. In a Thursday letter to investors — first reported by Reuters — Aschenbrenner compared the dynamic to a bank run: 'vulnerability begetting more vulnerability.'
The Rescue
By Wednesday, Aschenbrenner was selling whatever he could. Bloomberg reported he approached Sequoia and Greenoaks about purchasing private stakes, including a $3.5 billion slice of his Anthropic position. That deal fell apart. His backers Patrick and John Collison — the Stripe founders who seeded the fund — spent hours at his offices as he negotiated with Citadel and Millennium well past midnight, according to the Wall Street Journal.
Citadel won the auction. Before Thursday's open, Ken Griffin purchased the bulk of Aschenbrenner's public portfolio at more than 10% below market value, the Journal reported. Aschenbrenner used the proceeds to pay off his lenders. The fund survived with $10 billion in capital, keeping its Anthropic stake intact.
In a second letter to investors that Thursday, Aschenbrenner disclosed the fund was down 67% on the month but still up 80% on the year. His leverage and short positions were gone. The fund would not shut down. He offered investors one-on-one calls the following week — the same week scheduled for his spa honeymoon. 'I take full responsibility for these events,' he wrote.
The Wedding Proceeds
As guests began arriving in Carmel, California, Aschenbrenner was preparing to marry Avital Balwit, chief of staff to Anthropic CEO Dario Amodei. Fortune first reported their engagement in October. The Wall Street Journal described the event as a lavish affair: a colloquium of panels and breakouts, a ceremony at a Tuscan-style villa, and a honeymoon at a forest spa retreat. Balwit had previously joked on X that their wedding planners 'think we have lost it' after she requested a European Garden aesthetic 'on the cusp of the singularity.'
Neither Situational Awareness nor Anthropic responded to Fortune's request for comment.
What the Market Voted
The market has already voted — and its verdict on 3-to-4x leverage in a concentrated, illiquid book is unambiguous. Aschenbrenner's thesis may yet prove correct: AI infrastructure is real, Anthropic's valuation held, and the fund survived. But the episode is a clean-cut lesson in what happens when conviction outpaces risk management. Free enterprise rewards bold bets and punishes reckless ones in equal measure. Citadel, disciplined and liquid, bought distressed assets at a discount and walked away with value. That is how capital markets are supposed to work — no bailout, no regulator riding to the rescue, just a forced seller and a patient buyer settling the price. The groom got his wedding. His investors got a 67% drawdown and a phone call.
