Citadel’s purchase of the public equity portfolio of collapsed AI hedge fund Situational Awareness removed one of Wall Street’s largest forced sellers from the market and helped stabilize a semiconductor rout that had erased roughly $3 trillion in value across AI-related stocks, according to people familiar with the transaction.

Ken Griffin’s firm acquired a significant portion of the fund’s approximately $16 billion public-equity portfolio, easing fears that billions more in concentrated AI positions would be dumped into an already fragile market. The transaction calmed investors and was followed by a rebound across many semiconductor and AI infrastructure stocks, reducing the immediate risk of a broader cascade of forced selling.

The collapse unfolded with stunning speed. Situational Awareness lost 67% of its portfolio value during July, forcing the fund to unwind most of its public-equity holdings. “We let you down,” founder Leopold Aschenbrenner wrote to investors after the losses mounted.

Behind the collapse was leverage. Goldman Sachs, JPMorgan Chase and Bank of America, the fund’s three prime brokers, issued margin calls after a portfolio leveraged roughly four-to-one plunged in value. With few alternatives remaining, Aschenbrenner was forced to liquidate positions that only days earlier he had described as some of the market’s most attractive buying opportunities. Just six days before the margin calls, he urged investors to commit additional capital by Aug. 1. The money never came. What remains is an estimated $5 billion private stake in Anthropic, leaving Situational Awareness to continue primarily as a private investment vehicle.

The distinction between public and private assets proved critical. Public stocks are marked to market every trading day, allowing lenders to demand additional collateral as prices fall. Private holdings such as Anthropic are not subject to the same daily pricing, shielding them from immediate margin calls and allowing that portion of the portfolio to survive.

July’s AI correction was severe by any measure. The Philadelphia Semiconductor Index fell nearly 29% from its June peak, while the Morgan Stanley Momentum TMT Index dropped more than 50%, underscoring how rapidly investor sentiment reversed after months of extraordinary gains.

For Griffin, the rescue followed a familiar playbook. Working alongside co-chief investment officer Pablo Salame, chief operating officer Gerald Beeson, head of equity quantitative research Perry Vais and chief legal officer Shawn Fagan, Citadel reportedly analyzed the portfolio through the night before agreeing to absorb much of the risk. Market participants said few firms possessed the capital, liquidity and trading infrastructure necessary to execute a transaction of that size without creating additional market disruption.

It was not the first time Citadel stepped into a distressed situation. The firm previously acquired positions from Amaranth Advisors after the hedge fund’s historic natural-gas collapse and later absorbed assets from Sowood Capital, reinforcing Griffin’s reputation for buying complex portfolios when other investors are forced to sell.

Reuters has not determined how much Citadel ultimately earned from the transaction, although many AI-related holdings have recovered since the sale. Neither Citadel nor Situational Awareness commented publicly on the deal.

The fund’s rise made its collapse even more remarkable. Aschenbrenner launched Situational Awareness after leaving OpenAI in 2024 following a dispute over an alleged information leak that he denies. The fund quickly grew to roughly $20 billion in assets under management, backed by prominent technology investors including Stripe co-founders Patrick and John Collison, former GitHub CEO Nat Friedman and investor Daniel Gross.

The market’s recovery may still prove temporary. Analysts continue to warn that leverage remains elevated across AI-focused investment strategies, while rising Treasury yields and growing scrutiny over returns on massive AI infrastructure spending could trigger renewed volatility if expectations fail to match earnings over the coming quarters.

The broader lesson extends well beyond one hedge fund. The collapse of a single overleveraged investor intensified a selloff that erased roughly $3 trillion in value across AI and semiconductor companies before one buyer with the balance sheet to absorb the risk stepped in. Businesses across the economy have committed billions of dollars to AI infrastructure, hiring plans and long-term technology investments. July demonstrated how quickly financial leverage—not weakening demand for artificial intelligence—can threaten the stability of one of the market’s most important growth themes.

JBizNews Desk | New York

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