“Construction of the M15X fab in Cheongju has started, for completion in November 2025, with mass production from the third quarter of 2026.”

SK hynixCEO

Korean memory chipmaker; M15X investment plan presented by Kim Yeongsik, Head of Manufacturing Technology, at the company's AI-era vision press conference

Construction finished essentially on schedule (cleanroom opened and equipment installation began in October 2025, completion at end-2025 rather than November), and the fab's HBM3E/HBM4 ramp was pulled forward into the first half of 2026 — ahead of the promised third-quarter 2026 start.