Why is Micron Technology stock selling off 5% today?

Micron Technology's stock plunged 5.3% in mid-day trading, dropping to $936.68 and extending a multi-session decline as investors grappled with competitive threats and legal risks. The primary driver was Chinese memory manufacturer ChangXin Memory Technologies, which unveiled progress on a compact 4F² DRAM cell design that could increase storage density, potentially challenging Micron's server-memory dominance.

This posed a significant risk to the company's high-margin business segment. Additionally, patent licensing firm Netlist filed complaints with the U.S. International Trade Commission, alleging that Micron infringed on high-bandwidth memory patents, potentially leading to import restrictions on key products. Short-seller Michael Burry's repositioning into long-dated put options further fueled bearish sentiment, signaling a conviction that the AI memory boom may not be sustainable.

The broader semiconductor sector also declined, with Nasdaq and S&P 500 falling modestly, as global risk-off sentiment persisted due to concerns over AI investment sustainability and China's chipmaking advancements. Despite strong recent financials and a record buyback authorization, investor confidence in Micron's competitive edge has waned as geopolitical tensions and legal uncertainties cast a shadow over the company's growth prospects.