AI trade rebounds as Citadel absorbs $16 billion forced unwind

Citadel's $16 billion purchase removed the market's largest forced seller, but the July unwind showed how leverage turns a correct thesis into a liquidity event.

KOSPI surged a record 18% on July 31 as Citadel's $16 billion purchase of a collapsed AI fund's portfolio ended forced-selling in chip stocks.

"The levered unwinds are mostly over for now," said Calvin Yeoh, co-manager of the Merlion Fund at Blue Edge Advisors.

Samsung Electronics and SK Hynix each jumped about 30 percent, the Philadelphia Semiconductor Index posted its biggest gain since April 2025, and the VIX fell to 15.99 from above 20 earlier in the week. The rebound capped a brutal July in which the Nasdaq Composite fell about 3 percent, its worst month since March, and Goldman Sachs's high-beta momentum basket posted its worst monthly performance since November 2000.

The question now is whether the rebound marks a durable bottom or a pause before further deleveraging, with J.P. Morgan estimating hedge-fund unwinding is about 90 percent complete while warning that value, quality, and low-volatility factors may keep outperforming momentum into August and September, historically the weakest months of the year.

The collapse of Situational Awareness, the hedge fund run by former OpenAI researcher Leopold Aschenbrenner, was the trigger. The fund, which returned 439 percent in the first half of 2026 on roughly four-times leverage concentrated in AI infrastructure names, lost about 67 percent in July as its long positions in SK Hynix, SanDisk, Nebius, CoreWeave, and Bloom Energy fell more than 35 percent while shorted software stocks such as Adobe rebounded. Margin calls forced the fund to sell, and prime brokers Goldman Sachs, JPMorgan, Bank of America, and Citi coordinated the transfer of most of its $16 billion public portfolio to Citadel at a discount.

The deal removed a price-insensitive seller from the market, letting short covering and dip buying drive the rebound. But the episode was not isolated. U.S.-listed leveraged and inverse ETFs saw assets shrink to just under $150 billion by July 30, down nearly $60 billion from a June peak, while Korean stock leveraged ETFs fell to about $15 billion from a $53 billion high. J.P. Morgan data showed hedge-fund long-short leverage ratios dropping to 3.2 times from 5.7 times.

Momentum's worst month since 2000

The rotation out of momentum was historic. The Goldman high-beta momentum basket's daily swings approached 10 percent even as the S&P 500 moved less than 1 percent a day. Value, quality, and low-volatility factors rebounded, and the S&P 500 equal-weight index, the low-volatility index, and an S&P 500 index stripped of AI components all hit record highs this week. "Recent momentum weakness looks more like rotation than a crash," said Wai Lee, head of systematic equity research at Allspring Global Investments.

The selling extended beyond one fund. A Federal Reserve meeting that raised doubts about new Chair Kevin Warsh's resolve to curb inflation pushed long-end Treasury yields higher, with the five-to-30-year curve slope widening the most since August 2025. Wolfe Research quant analyst Yin Luo attributed the move to rising inflation expectations and higher term premiums rather than economic strength.

Fundamentals intact, but can the rally hold?

Underlying demand for AI infrastructure remains strong. Microsoft's Azure revenue rose 43 percent, beating the 39.98 percent consensus, and Amazon's AWS revenue climbed 37 percent to $42.2 billion with backlogged orders jumping to $496 billion from $364 billion. Lam Research guided next-quarter revenue to a midpoint of $8.1 billion, above the $7.09 billion Street consensus.

Still, the Philadelphia Semiconductor Index remains down more than 20 percent in July, its worst month since the global financial crisis, and KOSPI is off 22 percent for the month even after the record surge. "If there's already one Situational Awareness, how many more similar institutions are out there?" said Cusson Leung, chief investment officer at KGI International Wealth Management, comparing the relief rally to JPMorgan's 2008 purchase of Bear Stearns before Lehman Brothers collapsed.

Goldman's Pasquariello struck a more optimistic tone, arguing the market's fundamental base remains solid with more than $1 trillion of AI capital expenditure flowing into the system, while advising investors to "increase liquidity, reduce complexity" over the coming weeks. Simplify Asset Management's Paisley Nardini warned that July showed "simply buying the index" is no longer enough, and that active management is regaining value.

This article is for informational purposes only and does not constitute investment advice.