Renowned investor Michael Burry has dramatically escalated his bearish positioning against the semiconductor sector, doubling down on the conviction that the memory market's supply-demand dynamics are about to flip decisively.

In a recent Substack post, Burry revealed he has significantly expanded short positions against Micron Technology, AI infrastructure firm NEBIUS, the iShares Semiconductor ETF, and Palantir Technologies Inc., describing the move as "quite substantial" in scale. The immediate catalyst for this action was a public warning from Acer CEO Jason Chen, who cautioned that memory inventories are already accumulating, with fresh supply from multiple regions poised to hit the market and put downward pressure on prices by late 2027.

Despite the bearish thesis, semiconductor stocks rallied on the day of the disclosure—Micron Technology climbed over 2% intraday, the SOXX ETF gained roughly 1.5%, and both Nebius and Palantir edged higher. While this short-term price action puts pressure on Burry's positions, he noted that the Acer CEO's comments "align with what I believe to be true."

The Bear Case: AI Drives HBM Demand, But Conventional Memory Supply Is Rebounding

Burry's core argument centers on the premise that the recent memory shortage was not a structural demand boom, but rather a temporary supply-side dislocation. He explained that major manufacturers like Samsung, SK Hynix, and Micron Technology diverted substantial production capacity from traditional DRAM to high-bandwidth memory (HBM) to satisfy the voracious appetite of AI data centers, thereby creating tightness in conventional memory supply.

However, as these manufacturers restore conventional memory output and new capacity comes online across multiple geographies, Burry believes "normal DRAM" production is now rebounding. This means the supply-demand gap will gradually narrow, ultimately exerting downward pressure on prices.

Acer CEO Jason Chen's remarks provide fresh validation for this thesis. In an interview, Chen pointed out that memory inventories are already building up, with suppliers from various regions releasing more capacity into the market—challenging the mainstream expectation that shortages will persist for years. Burry, citing the interview, wrote that while interpreting this signal is "fraught with uncertainty," its direction aligns with his own assessment.

Short Strategy: From NVIDIA to Micron, The Bearish Footprint Keeps Expanding

Burry's bearish positioning on semiconductors did not materialize overnight. Disclosures show his firm Scion Asset Management had already established substantial put option positions on NVIDIA and Palantir Technologies Inc. during the third quarter of 2025, shortly before the fund was shuttered.

Entering 2026, Burry continued and expanded this trade in his personal capacity. In late June 2026, he initiated shorts against NVIDIA, Applied Materials, and the iShares Semiconductor ETF, rolling the SOXX put options out to March 2027. Two days later, he added Micron Technology to his short book, establishing a direct short position at roughly $1,051 per share. He explained the decision to short the stock outright rather than buy puts was driven by the prohibitive cost of Micron Technology's option premiums.

This latest escalation builds on those foundations, signaling that Burry's conviction in an impending memory cycle peak is growing stronger.

Retail Sentiment Stands in Direct Opposition to Burry's Thesis

The immediate market reaction suggests retail investors are not buying Burry's bearish narrative. According to Stocktwits data, retail sentiment for Micron Technology and the SOXX ETF was firmly in "bullish" territory on the day of Burry's disclosure. Sentiment for Nebius also leaned positive, while only Palantir Technologies Inc. showed a bearish retail reading.

This divergence highlights the prevailing optimism surrounding AI-related semiconductor stocks, which stands in stark contrast to Burry's bet on oversupply and falling prices. For investors, the pivotal question remains: when will semiconductor capacity expansion truly catch up with demand—the very variable upon which Burry's entire trade hinges.