Shares plunged 4.8% to $857.14 in pre-market trading as investors digested a one-two punch: Michael Burry expanded his short bet against Micron, and China's largest memory chipmaker just went public in a blockbuster debut. The selloff caps a brutal stretch — Micron is now down roughly 31% from its all-time closing high of $1,213 hit just five weeks ago.
• Burry Is Betting the AI Chip Boom Is a Bubble, Not a Trend. On July 24, Burry disclosed on his Substack that he sold short more shares of Micron at $933.86, adding to a bearish position he has been building across the semiconductor sector.
He initially shorted the stock directly at $1,051.87 after calling options "too expensive."
His bear case is structural: he argues current AI demand is not driven by real end customers, and believes the cycle that produced these gains may be nearing its end. With the stock now at $857, Burry is sitting on a significant paper gain — roughly 18% on his first tranche — lending his thesis fresh credibility among momentum-chasing traders.
• China Just Minted a Memory Chip Giant Overnight. CXMT shares soared nearly 466% on their Shanghai debut Monday, closing at 49 yuan and giving the company a market cap of about 3.3 trillion yuan (~$490 billion).
CXMT held a 7.67% share of the global DRAM market in 2025.
Its revenue surged over 700% year-on-year in Q1 2026, fueled by AI demand. For Micron shareholders, this matters because a well-capitalized Chinese rival flush with $8.6 billion in IPO cash intends to spend it on expanding memory chip production — a threat to the pricing power that underpins Micron's record earnings.
• The Insiders Who Know Micron Best Have Been Selling, Too. Micron is seeing insider selling at the highest level on record since 2010, per Oppenheimer.
SEC filings show 1 insider buy against 36 sells over the past year.
A valuation model from GF Value pegs fair value at roughly $489 — labeling the stock 99% overvalued at recent levels.
• The Bull Case Is Still Alive, But Narrowing. Micron's high-bandwidth memory production is sold out through 2026, and the four largest cloud providers are expected to spend more than $700 billion on AI infrastructure this year.
Consensus analyst price targets sit near $1,486 , implying 73% upside — but that gap between Wall Street optimism and the tape's reality is widening by the day. The $810–$860 zone is the key technical support level to watch ; a break below $800 could open the door to $700, a potential 44% decline from highs.