Aschenbrenner's Entire Stock Book Reportedly Sold to Citadel in One Block

Leopold Aschenbrenner's AI-focused hedge fund Situational Awareness reportedly unloaded its entire public stock portfolio in a single block trade to Ken Griffin's Citadel after steep losses on its levered AI book. The former OpenAI researcher's fund was scrambling to raise cash to meet margin requirements before Citadel stepped in to buy the publicly traded assets.

What actually happened

Situational Awareness LP ran roughly $225 million into as much as $45 billion in under two years, printed a 439% net return through June 2026, and then lost control of all of it in six trading days, selling its entire public book — longs and shorts together — in a single block trade to Citadel before the market opened on July 30.

Bloomberg reported the fund was forced to liquidate to meet margin calls after suffering large losses in AI-related names. The fund had used gross leverage of nearly four times and got run over as many of its top AI longs fell 40–50% this month while its software shorts rose sharply.

How a $45B fund unwound in a week

The fund reportedly hit a $45 billion net asset value by early July on 450% year-to-date gains from leveraged AI infrastructure and semiconductor bets. A mid-July selloff, worsened by that 4x leverage, triggered margin calls and the forced sale of the public equity portfolio to Citadel at discounted prices.

Even after the blowup, the manager is not wiped out. The fund kept its unlevered holdings and private stakes, including Anthropic, and remains up substantially year-to-date.

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Why Citadel is the winner here

Every core position Situational Awareness was forced out of bottomed on July 29, the day the margin calls crested, and bounced violently on July 30 the moment the block hit Citadel. In short, Griffin's shop got size on the AI trade near the lows while a forced seller was on the other side.

The optics are also loud. Other reports have noted Citadel was flagging surprise-rate-hike risk in the days before the AI trade cracked, right before it stepped in as the buyer of the forced unwind.

The bigger lesson for traders

This is a leverage story, not a thesis story. The 24-year-old who wrote the AGI decade's defining investment memo was undone by four times gross leverage — a portfolio that was not wrong, but early and levered, which markets punish identically to wrong.

For anyone running concentrated AI exposure, the read-through is simple: forced sellers can move your book more than fundamentals for days at a time, and margin math does not care about your five-year view.

Options market and stocks to watch

Names tied to the AI infrastructure trade that Situational Awareness was reportedly long are worth watching for follow-through flow now that the forced selling pressure appears to be cleared.

• NVDA: Watch for whether AI-infrastructure demand narratives regain control of the tape post-unwind.
• MU: Memory names were flagged as part of the rebound alongside the block; watch for continuation or fade.
• WDC: SanDisk-linked exposure was cited in the rebound narrative; watch flow and IV crush.
• CRWV: AI infrastructure name tied to the leveraged long thesis; watch for institutional repositioning.
• IREN: Named among the fund's exposure; watch for unusual options activity as the book changes hands.

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