Saving AI Trades? Citadel Takes Over 'AI Stock Guru' Positions; Investment Bank Strategists: 'Finally Understand the Cause of the Plunge, Now We Can Look Forward'

Citadel's acquisition of the public equity portfolio of hedge fund Situational Awareness is widely regarded by market participants as a key step in curbing the recent plunge in AI stocks. This transaction eliminated a known forced seller, providing support to the semiconductor sector, which had been in free fall.

Citadel, led by Ken Griffin, purchased approximately $16 billion worth of public equities held by Situational Awareness on Thursday at a discount of more than 10%. Several market participants believe this deal prevented the fund from massively dumping its AI holdings, thereby avoiding further panic selling. Following the news, US tech stocks recorded their largest single-day gain in nearly four months, while Korea's chip-heavy stock market rebounded by as much as 18% on Friday.

The market's rapid reversal was not solely due to Situational Awareness being "bailed out." Investors and analysts also pointed out that Microsoft's strong earnings report released on Wednesday helped alleviate concerns about the sustainability of tech giants' massive AI investments. However, the predicament of Situational Awareness gave investors "a welcome narrative" to explain the root cause of the continued pressure on chip stocks.

The Three-Week Mystery: Who Was Driving the Second Round of Declines?

Situational Awareness, founded by Leopold Aschenbrenner, had concentrated its holdings in semiconductor and AI infrastructure companies that led the Wall Street AI rally in the first half of 2026. During this period, AI infrastructure suppliers, such as chip manufacturers, took the baton from large tech "hyperscalers" to lead the market.

However, this trade direction had become extremely crowded. A July survey by Bank of America showed that 82% of respondents listed "going long global semiconductors" as the most crowded trade globally. The Philadelphia Semiconductor Index doubled from the beginning of the year to its peak in late June, before correcting by nearly 20%; the Nasdaq index, composed of global semiconductor stocks, had lost $3 trillion in market value by its low point this week.

Situational Awareness's concentrated positions, combined with leveraged financing, made it particularly vulnerable when market sentiment shifted abruptly in July. Stocks heavily held by the fund, such as Sandisk and CoreWeave, saw declines approaching 60% at one point, and expectations that the fund might be forced to sell off massively likely exacerbated the decline further.

"If a highly leveraged major player starts being forced to liquidate, some participants in the market will know in advance," said Mike Zigmont, Co-Head of Trading at Visdom Investment Group, "They will front-run the sales to profit from it."

Max Kettner, Chief Multi-Asset Strategist at HSBC, stated that the plight of Situational Awareness provided the market with a "narrative" to explain the continuous decline in momentum stocks over the past three weeks:

"We were confused for three weeks, not knowing who was driving the second leg of this decline. Now we have found the answer and can look forward."

Citadel Steps In, "Known Seller" Exits

The direct effect of Citadel's intervention was immediate. Stocks previously heavily held by Situational Awareness led the rebound—Nebius, a Dutch AI infrastructure company, rebounded more than 30% from its Wednesday low; the fund held a 5.6% stake in it as of May. Energy company Bloom Energy rose by as much as 40% during the same period, having previously held about a 2% stake by Situational Awareness.

Charles-Henry Monchau, Chief Investment Officer at Syz Bank in Switzerland, stated, "Removing a known forced seller is essentially bullish."

The structure of the deal also drew attention. According to insiders, Citadel acquired the aforementioned stock portfolio at a discount of over 10%. For Citadel, this was both an opportunity to buy the dip and a role in stabilizing the market.

Lingering Concerns: The Questions of Leverage and AI Valuation

Despite the noticeable repair in market sentiment, some analysts remain cautious about the sustainability of the rebound.

Peter Tchir, Head of Macro Strategy at Academy Securities, warned, "Removing that seller from the market certainly helps, but there is too much money in this space carrying leverage. I think we will see selling pressure again in the next two weeks."

He further pointed out structural issues in the market:

"We rose more than we should have, and fell deeper... The questions about whether AI spending is justified will not disappear."

Meanwhile, concerns that the continued rise in US Treasury yields will further suppress high-valuation tech stocks have not been fundamentally resolved. Citadel's move may have eliminated the most direct "trigger" of this AI stock turmoil, but the structural pressures hanging over the market still await the test of time.