Leopold Aschenbrenner’s AI Fund Was Forced to Sell. Were Micron and SanDisk Wrong—or Just the Leverage?

The AI-focused Situational Awareness fund of Leopold Aschenbrenner had to divest its holdings in Micron Technology and SanDisk Corporation after experiencing significant losses and margin pressure, according to a Form 13F filed on August 14. The fund had amassed a substantial exposure to AI infrastructure, with over half of its U.S. equity book allocated to SanDisk and Micron.

However, the concentrated portfolio structure ultimately proved unsuccessful. While SanDisk reported robust revenue growth in the data-center sector driven by AI storage demand, Micron's high-bandwidth memory supplies are crucial for AI accelerators. Nonetheless, capital intensity, inventory cycles, export controls, and capacity expansions introduced bearish factors.

When a fund employs substantial leverage, falling long positions can lead to margin calls, potentially precipitating forced selling before the company's demand thesis unfolds. Consequently, the episode serves as a cautionary tale about the perils of leverage and portfolio concentration. The timing of the disclosed sale, occurring near the peak of the investment, underscores the importance of fundamental research complemented by an analysis of balance sheets, liquidity, and an awareness that delayed disclosures may reflect past risks rather than the current ownership situation.