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Micron Reportedly Plans ¥1.5 Trillion HBM Fab in Hiroshima Backed by Japanese Subsidies

Japan is poised to fund roughly a third of the build to strengthen its AI‑chip ecosystem.

Overview

  • Nikkei Asia reports Micron plans a new EUV-enabled DRAM and high-bandwidth memory facility at its Hiroshima site with about ¥1.5 trillion in investment.
  • Government support is reported at roughly ¥500–536 billion, though neither Micron nor Japan’s METI has confirmed the plan.
  • Timelines in the coverage diverge, with one account pointing to construction starting in May 2026 for 2028 shipments and another suggesting 2027 mass output.
  • The factory would focus on HBM for AI accelerators as supply remains tight and industry trackers show Micron approaching roughly 20% of HBM shipments.
  • Micron shares rose about 2.7% after the subsidy reports, signaling investor optimism about expanded capacity.