M15X and the Fab PipelineNarrow moat
SK hynix (SKHY) — moat facet
A fab pipeline is the clearest statement a memory company ever makes about what it believes, because it cannot be revised once poured.
Memory capacity is decided years before it is needed, which makes the fab pipeline the clearest available statement of what a company believes.
SK hynix opened the cleanroom of M15X, an extension fab at Cheongju, in October 2025 and began wafer input in the first quarter of 2026, ramping through the year. It is aimed specifically at next-generation DRAM including HBM. Separately, construction of an integrated complex at Yongin began in February 2025, with the phase-one cleanroom of the first fab expected in the first quarter of 2027, and an advanced packaging plant is being built alongside1.
What this buys is the ability to serve demand that is currently constrained. HBM is capacity-limited, and capacity limits are the only reason a memory maker ever leaves revenue on the table.
What it costs is a commitment made at the top of the best cycle the industry has seen, on a forecast that must hold for years. That is the structure of the business rather than a criticism — a fab cannot be ordered after the demand appears — but it is also precisely how every previous memory glut was manufactured.
The number to watch is when the capacity actually produces saleable output relative to when industry bit supply growth overtakes demand growth. Arriving a year late into a softening market is the ordinary outcome.
Two fabs and a packaging plant are under construction at once, against a long-term plan sized at roughly ₩600 trillion for Yongin and ₩100 trillion for Cheongju.
M15X, the Yongin cleanroom due in early 2027 and P&T7 are being built at once. Commitments this large show the pipeline being funded; a cut would show SK hynix expecting the shortage to end.
Source: SK hynix semi-annual report, H1 2026 ↗- ReportedThe M15X cleanroom opened in October 2025 with wafer input from the first quarter of 2026; Yongin construction began in February 2025 with the first fab's phase-one cleanroom expected in the first quarter of 2027, and an advanced packaging plant is being built alongside.SK hynix Inc., Form 424B4 prospectus for its Nasdaq offering (SEC, CIK 2120882) — FY2025 revenue W 97,147bn, cost of sales W 38,456bn, gross profit W 58,691bn, S&A W 5,019bn, R&D W 6,466bn and profit for the year W 42,948bn, against FY2024 revenue W 66,193bn / profit W 19,797bn and FY2023 revenue W 32,766bn / cost of sales W 33,299bn / gross loss W 533bn / loss for the year W 9,138bn; Q1 2026 revenue W 52,576bn, gross profit W 41,679bn, profit W 40,346bn. IDC market shares for Q1 2026: second in DRAM at 29.1%, first in HBM at 56.4%, second in NAND at 18.5%, with the three DRAM producers together above 90% of revenue. DRAM products were 77.1% of total sales in 2025 and 77.3% in Q1 2026; NAND 21.3% and 22.0%. Competitors named: Samsung Electronics, Micron Technology and CXMT in DRAM; Samsung Electronics, Kioxia, Micron Technology and Sandisk in NAND; competitive factors listed as 'pricing; manufacturing costs, yields and product availability; product performance, quality and reliability'. First to develop HBM using TSV packaging, commercialised HBM3E in 2024 and developed HBM4 in 2025; HBM carried a per-gigabyte price premium of more than five times traditional DRAM in 2025. M15X cleanroom opened October 2025 with wafer input from Q1 2026; Yongin construction began February 2025 with the first fab's phase-one cleanroom expected Q1 2027; an advanced packaging plant (P&T7) is under construction in Cheongju and one is planned in Indiana for the second half of 2028. Intel's NAND business cost US$6.6bn in December 2021 plus US$2.2bn in March 2025, operated as Solidigm; NAND mass production is transitioning from 176-layer to 238- and 321-layer technologies. Gartner forecasts DRAM revenue of US$143bn in 2025 rising to US$401bn in 2027, HBM US$33bn to US$86bn and NAND US$68bn to US$341bn. A substantial portion of sales is attributable to a limited number of customers located in the United States and China; the two largest were 14.8% and 12.4% of revenue in Q1 2026 and the largest was 23.9% of revenue in 2025. The offering was 177,900,000 ADSs at US$149.00, each ADS one-tenth of a common share, representing 17,790,000 shares against 712,702,365 outstanding; Baillie Gifford, Coatue and Situational Awareness Partners indicated non-binding interest of up to US$7bn. — FY2023-FY2025 and Q1 2026 · publ. 2026-07-10 · source ↗