Micron breaks ground on $9.3B HBM fab in Japan; adds subsidized capacity for AI

Micron Technology broke ground on a $9.3 billion memory-chip manufacturing facility expansion in Hiroshima Prefecture, Japan, to significantly scale production of high-bandwidth memory (HBM) and advanced DRAM for AI processors. Japan's Ministry of Economy, Trade and Industry is providing up to $3.1 billion in subsidies to support the project. Commercial shipments from the expanded facility are expected to begin in summer 2028, adding critical HBM capacity to the global AI infrastructure supply chain.

This expansion complements Micron's broader domestic push: the company is also building two leading-edge fabs in Boise, Idaho, and broke ground in January on a $100 billion semiconductor campus near Syracuse, New York, aimed at strengthening U.S. memory-chip supply-chain resilience. Micron CEO Sanjay Mehrotra noted that the Hiroshima facility's first HBM production wafer was manufactured on-site, demonstrating the strength of combining American innovation with Japanese manufacturing. Japan's government is aggressively courting overseas chipmakers, with PM Sanae Takaichi unveiling a $630 billion combined public-private investment roadmap through 2041.

The Hiroshima project positions Micron as the only domestic DRAM producer in Japan, filling a critical gap. HBM remains the bottleneck in AI server buildout—backlog extends into 2027, and three suppliers (SK Hynix, Micron, Samsung) are racing to add capacity. Micron's 2026 DRAM sales hit $31.3 billion in Q2, up 343% year-over-year, confirming acute supply constraints. The Japan site offers cost efficiency (via subsidies), geography arbitrage (shorter routes to customers), and manufacturing expertise partnership.

For infrastructure buyers and operators, Micron's Japan gamble signals committed supply diversification away from Taiwan/Korea bottlenecks. The 2028 ramp aligns with early-2030s AI demand scaling, suggesting Micron expects sustained HBM growth through end-of-decade. Subsidy structures are becoming standard across U.S./Japan/EU fab buildout—this shifts the competitive equation toward integrated players with geopolitical backing, not pure-play designs.