Shares cratered as Bloomberg reported that construction at Micron Technology's Fab 11E in Taoyuan, Taiwan, has "all but halted" over a labor dispute — and the sell-off snowballed into the worst single-day rout the stock has seen in years. Micron closed 17.5% lower at $656.39 on Nov. 5 , dragging its Buenos Aires-listed shares down a comparable 16.7% to ARS 223,450. The stock now sits more than 40% below its June all-time closing high of $1,213.56.

  • A $4.5 Billion Project Frozen Over a Pay Fight Nobody Expected. The trigger was an October 22 warning strike by the Taoyuan union — the first strike in Taiwan's semiconductor sector.

Fewer than 3,000 workers are demanding 15% of Micron's global operating profit in cash , and management fears the deal already struck with the larger Taichung union could unravel. Fab 11E, a $3–4.5 billion project slated to start producing chips in 2028 , is now frozen with no restart date. The plant was not scheduled to produce wafers until 2028 — so no current output is lost — but the delay clouds Micron's ability to meet surging demand for AI-grade memory.

  • Taiwan Makes 60% of Micron's Chips — That Concentration Now Looks Risky. Taiwan accounts for roughly 60% of Micron's global DRAM output and a substantial share of its high-bandwidth memory.

Micron is the largest foreign investor in Taiwan, with about $50 billion invested and ~15,000 employees locally.

The dispute has raised the possibility that Micron may reconsider its Taiwan-centered manufacturing strategy. The company is hedging with facilities in Japan, Singapore, and the U.S., but those are years from offsetting Taiwan's share.

  • The Market Traded This as More Than a Labor Story. Analysts argue the market didn't just trade the labor dispute — it traded the possibility that the dispute is a proxy for something larger: a slowdown in AI memory demand.

Investor anxiety over political gridlock in Washington and heightened scrutiny on data-center permitting rattled the entire semiconductor complex.

Western Digital and AMD fell almost as far.

  • Valuation Has Compressed — But the Earnings Question Lingers. At the Nov. 3 close, Micron traded at just 11.4× trailing earnings, versus 22.8× for the S&P 500 — a discount that only holds if profits stay near record levels. Management concedes it doesn't yet have "line of sight to when supply and demand will return to balance." Until the Taoyuan dispute is resolved and AI spending fears subside, the cheap multiple may simply reflect the uncertainty shareholders are being asked to absorb.