"I Do" and "I Owe": The AI Prodigy Whose $45 Billion Hedge Fund Collapsed Days Before His Lavish California Wedding

 "I Do" and "I Owe": The AI Prodigy Whose $45 Billion Hedge Fund Collapsed Days Before His Lavish California Wedding

**Leopold Aschenbrenner spent his wedding week fighting margin calls and negotiating a fire sale to Ken Griffin's Citadel. The fund lost 67% in July, but the ceremony—and the Anthropic stake—survived.**

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## A Wedding to Remember for All the Wrong Reasons

Leopold Aschenbrenner was supposed to be having the best week of his life. The 24-year-old former OpenAI researcher, dubbed the "Nostradamus of AI" for his prescient predictions about the artificial intelligence boom, was set to marry Avital Balwit—chief of staff to Anthropic CEO Dario Amodei—in a lavish Carmel, California ceremony . The multi-day affair was to begin with a "colloquium of panels and breakouts," followed by a ceremony at a Tuscan-style villa and a honeymoon at a forest spa retreat .

Instead, he spent his wedding week fighting to save his hedge fund .

Aschenbrenner's **Situational Awareness** fund, which had swelled to an estimated $45 billion at its peak on a concentrated, highly leveraged bet on AI infrastructure names, imploded spectacularly in a matter of days . The fund was forced to sell the bulk of its public holdings to Ken Griffin's Citadel at a discount after margin calls from its prime brokers came due .

## The Numbers That Tell the Story: A $35 Billion Wipeout

The scale of the collapse is staggering:

| Metric | Value |

|--------|-------|

| **Peak AUM (July 2026)** | $45 billion  |

| **Post-Citadel Sale AUM** | $10 billion  |

| **July Performance** | -67%  |

| **YTD Performance (post-July)** | +80%  |

| **Leverage Used** | 3x to 4x  |

| **Fund Inception (2024)** | ~$225 million  |

| **Pre-Crash Returns** | +1,000%+ since inception  |

The fund's concentrated portfolio of AI infrastructure names—including SK Hynix, CoreWeave, Sandisk, and Nebius—each shed more than 30% of their value in July . At the same time, Aschenbrenner's bearish bets on software companies went the wrong way, creating losses on both sides of a leveraged, concentrated book .

## The Forced Sale to Citadel

As positions deteriorated through late July, banks began demanding more collateral . Aschenbrenner sold stock to meet the calls, only pushing prices down further—a dynamic he later compared to a bank run, with "vulnerability begetting more vulnerability" .

On Wednesday night, the fund was forced to act. Citadel, Millennium, and Jane Street—an existing Situational Awareness investor—all submitted competing bids for the fund's public equities book . Citadel won, buying the bulk of the portfolio at more than 10% below market value .

**The fund kept its best asset.** Situational Awareness did not sell its private portfolio, which includes a significant stake in Anthropic—a holding estimated at roughly $5 billion . That position now accounts for about half of the fund's remaining assets .

## The Backstory: From OpenAI to Hedge Fund Star

Aschenbrenner's journey to Wall Street was anything but conventional. He graduated as valedictorian from Columbia University at 19, worked for Sam Bankman-Fried's FTX Future Fund, and joined OpenAI in 2023 to work on AI safety .

In 2024, he was fired from OpenAI and published a 165-page essay titled **"Situational Awareness: The Decade Ahead"** . The essay turned the 22-year-old into a celebrity. Within weeks, he raised $225 million from Silicon Valley heavyweights including Stripe co-founders Patrick and John Collison, former GitHub CEO Nat Friedman, and investor Daniel Gross .

His fund, named after the essay, placed concentrated and heavily leveraged bets on companies linked to memory chips, data centers, and other AI infrastructure . By the end of June, the fund had generated cumulative gains exceeding 1,000% .

**Then came July.**

## The Irony: Right About AI, Wrong About Leverage

The collapse of Situational Awareness is a case study in Wall Street's oldest lesson: **leverage magnifies losses as much as gains.**

Aschenbrenner was running three to four times leverage on his positions—borrowing three to four dollars for every dollar of investor capital . That kind of gearing turns an ordinary sector pullback into a solvency event.

The irony is that his AI thesis appears to have been correct. The stocks he was forced to sell rallied sharply the day after the liquidation, with Sandisk surging 26% and CoreWeave jumping 21.5% . The market didn't care about his long-term views—it cared that he needed to sell right now.

## What Happens Next

Aschenbrenner's fund is not shutting down. It remains operating with roughly $10 billion in assets, mostly in private holdings—including the Anthropic stake . Aschenbrenner has vowed to run the public stock portfolio **without leverage** going forward .

**"We let you down this month,"** he wrote in his investor letter. **"I take full responsibility for these events."** 

As for the wedding? It proceeded as planned. Guests arrived in Carmel as the fund collapsed, and Aschenbrenner reportedly hosted the ceremony despite the turmoil .

The markets may have won the week. But the groom—and his Anthropic stake—survived to fight another day.

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## Disclaimer

**IMPORTANT:** This article is for informational and educational purposes only and does not constitute financial, investment, or trading advice. The information contained herein is based on publicly available sources and reflects the author's understanding as of the publication date. Market conditions, stock prices, and fund performance are subject to rapid change. Past performance is not indicative of future results. You should consult with a qualified financial advisor before making any investment decisions.