Overview
SK Hynix is a South Korean semiconductor company and one of the world’s largest producers of DRAM and NAND flash memory. Together with Samsung, it controls roughly 70% of global DRAM supply and leads global production of high-bandwidth memory (HBM) critical to AI accelerators. As of Q3 2025, SK Hynix holds the top DRAM market share position globally.
Key Facts
- Global DRAM leader: Q3 2025 market share 33.2% ($13.75B revenue, +12.4% QoQ) — edging out Samsung (32.6%) TrendForce DRAM Market Share Q3 2025
- HBM dominance: Holds leading position in HBM production; current capacity ~160,000 wafers/month OpenAI Stargate 900K DRAM Wafers — TrendForce
- HBM operating margin: ~70% on HBM products, versus razor-thin margins on commodity DRAM Memory Shortage Driving Higher Costs — Sourceability
- Together with Samsung, accounts for ~70% of global DRAM; combined with Micron, the top three control ~91.5% of global DRAM revenue TrendForce DRAM Market Share Q3 2025
- Shares South Korea’s ~64.7% helium import dependency on Qatar Helium Crisis Tightens Grip On Global Chip Supply Chain
- Signed non-binding LOI with OpenAI (Oct 1, 2025) for massive DRAM wafer supply — simultaneously with Samsung, neither knowing about the other’s deal. Combined LOIs: ~900K wafers/month, ~40% of global output, $71.3B over 4 years (analyst estimate) OpenAI Stargate 900K DRAM Wafers — TrendForce OpenAI Orders 71B in Korean Memory Chips — Light Reading
- Fab expansion plans: Cheongju M15X fab completion end of 2025; Yongin Semiconductor Cluster Phase 1 May 2027 OpenAI Stargate 900K DRAM Wafers — TrendForce
- Q4 2025 DRAM contract price outlook: +45-50% QoQ (conventional); +50-55% QoQ total (including HBM) TrendForce DRAM Market Share Q3 2025
Newsletter Relevance
Same exposure as Samsung to helium supply disruption. SK Hynix’s HBM market leadership places it at the center of the AI infrastructure supply chain — it was the co-target of OpenAI’s LOI strategy and stands to profit most from sustained elevated DRAM prices. The concentration of leading-edge HBM production in two South Korean companies creates a single-country chokepoint for AI accelerator supply chains. The helium crisis doubles down on this concentration risk.
Connections
- Samsung — competitor and fellow South Korean memory giant; co-signed OpenAI LOIs; shares Qatar helium dependency
- OpenAI — signed non-binding LOI for DRAM supply (Oct 2025)
- Qatar — primary helium supplier, currently offline
- Micron — the third member of the DRAM oligopoly
- TSMC — different logic-chip role but shared helium vulnerability
- Air Liquide — primary industrial gas supplier
Source Appearances
- Helium Crisis Tightens Grip On Global Chip Supply Chain — identified as acutely exposed to helium disruption
- OpenAI Stargate 900K DRAM Wafers — TrendForce — co-target of OpenAI LOI; HBM capacity details; fab expansion plans
- OpenAI Orders 71B in Korean Memory Chips — Light Reading — co-recipient of $71.3B LOI with Samsung
- TrendForce DRAM Market Share Q3 2025 — Q3 2025 market share leader at 33.2%
- Memory Shortage Driving Higher Costs — Sourceability — 70% HBM operating margin cited
- Sam Altman’s Dirty DRAM Deal — signed LOI alongside Samsung; neither knew about the other
- The Letter That Moved a Market — Medium — LOI mechanism and price cascade
- IDC Global Memory Shortage Crisis Market Analysis 2026 — named as one of the three oligopoly members deliberately shifting capacity from consumer to AI
- Samsung SK Hynix Surge 10 Percent as Tech Rebounds — Investing.com — rallied 9.5% on Apr 1, 2026, rebounding from 20%+ March losses driven by TurboQuant panic
Open Questions
- What is SK Hynix’s helium recycling capability compared to Samsung’s HeRS system?
- How did SK Hynix’s LOI with OpenAI change after OpenAI’s 57% spending cut and Stargate cancellation? Are the LOIs being quietly renegotiated?
- If CXMT or YMTC reach commodity DRAM scale in 2027-2028, how does SK Hynix compete — double down on HBM or defend commodity share?