Leopold Aschenbrenner’s Situational Awareness fund disclosed an extraordinary concentration in AI infrastructure by June 30, according to a Form 13F filed on August 14. Then,it reportedly sold its public-equity portfolio to Citadel after severe July losses and margin pressure. Axios attributed the sale to an unnamed source. Its Q2 Form 13F showed approximately 2.5 million shares of Sandisk Corporation (NASDAQ:SNDK) and 4.8 million shares of Micron Technology, Inc. (NASDAQ:MU). Together, the memory names represented more than half of the disclosed U.S. equity book. The subsequent sale proves the portfolio structure failed. It does not, by itself, prove the companies’ operating theses were wrong.
Source: Sandisk Corporation
SanDisk’s bull case is AI storage demand. The company reported $2.98 billion of fiscal Q4 data-center revenue and 437% full-year growth in that business, illustrating how quickly flash requirements expanded. The bear case is violent cyclicality, price competition, and a share price that can outrun normalized earnings. Sandisk Corporation (NASDAQ:SNDK) lost more than 40% during the July unwind, showing how little fundamental conviction protects a leveraged holder from forced selling.
Micron supplies the high-bandwidth memory that feeds AI accelerators. Tight supply and customer commitments support the bull case, while capital intensity, inventory cycles, export controls, and new capacity support the bear case. Micron Technology, Inc. (NASDAQ:MU) fell by more than one-third during the same period. When a fund uses substantial leverage, falling long positions can trigger margin calls before their multiyear demand thesis has time to play out.
Other hedge funds became more positive on both stocks in Q2. Insider Monkey counted 128 funds holding SanDisk, up from 114, and 184 holding Micron, up from 154. Wells Fargo increased its SanDisk position 172% to 839,305 shares, while Soros Fund Management raised its Micron stake about 694% to 22,422 shares. Those moves do not validate Aschenbrenner’s sizing, but they show the underlying ideas were not isolated.
At the August 14 settlement, 7.68 million SanDisk shares were sold short, 5.32% of the reported float and about one day of average volume. The episode is best read as a warning about leverage and concentration. Good assets can still become disastrous positions when financing dictates the exit date.
There is a second lesson in the timing. The 13F captured the portfolio near its peak but reached the public after much of the liquidation had occurred. Anyone copying the filing without newer reporting would have followed a position the manager no longer controlled. Fundamental research must therefore sit beside balance-sheet analysis, liquidity, and an understanding that delayed disclosures can describe yesterday’s risk rather than today’s ownership.
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