Lock HBM Supply Now: SK Hynix IPO Buys Capacity, Not Time

SK Hynix recently completed the largest-ever foreign company IPO in U.S. history, raising $26.5 billion by pricing 177.9 million ADRs at $149 each. The offering was seven times oversubscribed, with demand from over 500 investment firms, including Baillie Gifford, Coatue Management, and Situational Awareness Partners, which showed interest of up to $7 billion. The proceeds, led by a 13-bank syndicate, are primarily allocated for expanding high-bandwidth memory (HBM) and advanced-packaging capacity. SK Hynix, the world's leading HBM supplier with a 56.4% market share, has already sold out its 2026 output of HBM, DRAM, and NAND — a commitment confirmed in the company's Q3 2025 earnings, where SK Hynix stated that demand for all DRAM and NAND products for 2026 had been secured by its key customers months before the IPO.

The capital will fund a multi-year expansion plan. Per the company's SEC F-1 filing, construction at the Yongin semiconductor cluster began in February 2025, with the phase-one cleanroom opening accelerated to February 2027 — three months ahead of the original May schedule. The first fab will house six cleanrooms, with up to three additional fabs planned, subject to evolving market conditions. A new P&T7 advanced-packaging line in Cheongju is expected to be operational by the end of 2027, and EUV lithography equipment worth approximately $7.8 billion is scheduled for delivery by December 2027. In the U.S., SK Hynix is investing $4 billion in an advanced-packaging plant in West Lafayette, Indiana, with production targeted for around 2028. The plant is eligible for $458 million in CHIPS Act grants and $570 million in federal loans. According to the company's SEC filing, HBM accounted for 42% of 2025 revenue, approximately $18.6 billion, while U.S. customers represented 68.8% of total revenue.

Gartner projects the HBM market to grow from $33 billion in 2025 to $86 billion in 2027, a 60.5% CAGR. DRAM average selling prices are forecast to increase 136.4% year-over-year in Q1 2026 and 198.1% in Q2 2026. SK Hynix posted record 2025 results: 97.15 trillion KRW in revenue (~$68.1 billion USD) and 47.21 trillion KRW in operating profit (~$33 billion USD, 49% margin) — nearly doubling operating profit year-over-year. The Q1 2026 operating profit already hit 37.6 trillion KRW (~$26 billion USD) at a 72% margin, putting the company on a run-rate consistent with analyst estimates of approximately 133 trillion KRW in full-year 2026 operating profit. The company warned in its SEC filing that long-term growth depends on increasing production capacity, indicating that capital is no longer the binding constraint — cleanroom space and advanced-packaging throughput are.

For AI architects, this record raise addresses a 2028 supply problem, not a 2026 one. With 2026 output already committed and new Yongin capacity not available until Q1 2027, the shortage is expected to continue into next year. Some supply-chain estimates suggest tightness could extend toward 2030 given fab lead times. Inference clusters being provisioned now must be designed around fixed HBM allocations and elevated memory costs for at least the next four to six quarters. The concentration risk is immediate: any yield regression in advanced packaging or delay in EUV tool installation directly impacts GPU cluster delivery timelines.

Treat HBM procurement with the same urgency as GPU procurement. Lock in supplier commitments now and model memory costs as sticky through at least 2027 — a record IPO buys fabs, but not time.