SK Hynix

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
• AI-windfall labor precedent (the model Samsung’s deal built on): under union pressure, SK Hynix abolished its performance-bonus caps and allocated 10% of operating profit to employee bonuses — the precedent Samsung workers cited in 2026. Reported per-worker figures: ~$460K–$477K in 2026, with a next-year projection near ~$900K. This makes SK Hynix the first instance of the AI Windfall Sharing profit-share structure at a memory chokepoint; Samsung’s May 27 ratification is the second and larger one. Foreign Media Frame Samsung Strike as Haves vs Have-Mores — Seoul Economic Daily - 2026-05-20 Samsung Chip Workers Accept $340K Average Bonus — Tom’s Hardware - 2026-05-27
  • Dated origin (primary): the union ratified the deal on September 4, 2025 — 10% of annual operating profit into a bonus pool for 33,625 employees, a 6% wage increase, a 10-year term, and abolition of the prior 1,000%-of-base-salary cap (management had proposed merely raising it to 1,700%). Cost ~3.8 trillion won (~$2.7B), ~$80,000/employee average for 2025; 80% paid early 2026, 20% over the next two years. Bloomberg flagged at the time that it “could influence labor practices at other Korean companies, including rival Samsung” — and five Samsung affiliate unions promptly petitioned Jay Y. Lee. This is the authoritative source behind the “previous fall” precedent the June 5 flagship leans on. SK Hynix 2.7 Billion Bonus Deal Ratified — Bloomberg - 2025-09-04
• Reward burden vs. reinvestment (the cost-incidence data point): combined 2026 shareholder returns + employee bonuses ≈100 trillion won — up ~+450% YoY (shareholder returns 45–90T won, up to 7× last year; employee bonuses ~23T won at 10% of OP, ~5× last year) — while CAPEX + R&D grows only +20–30% (36.6T → ~50T won). Industry observers warn the reward pace “far exceeds the growth in CAPEX and R&D, which are directly tied to future competitiveness,” and question large bonus payouts during the pursuit of a U.S. ADR listing. This is the chip-layer AI Cost Incidence evidence: the windfall is a profit-share absorbed by shareholders/reinvestment headroom, not (mechanically) passed to memory buyers. SK Hynix 100 Trillion Won Reward Burden — Seoul Economic Daily - 2026-05-05

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
• Foreign Media Frame Samsung Strike as Haves vs Have-Mores — Seoul Economic Daily - 2026-05-20 — SK Hynix’s 10%-of-OP, bonus-cap-abolition precedent named as the model Samsung workers cited
• Samsung Chip Workers Accept $340K Average Bonus — Tom’s Hardware - 2026-05-27 — SK Hynix precedent referenced in the context of the Samsung ratification
• SK Hynix 100 Trillion Won Reward Burden — Seoul Economic Daily - 2026-05-05 — ~100T won shareholder+employee rewards (+450%) vs. CAPEX/R&D (+20–30%); competitiveness crowd-out
• SK Hynix 2.7 Billion Bonus Deal Ratified — Bloomberg - 2025-09-04 — dated primary on the Sept-4-2025 union ratification: 10%-of-OP / 33,625 employees / 6% wage / 10-year / cap abolished; the origin of the profit-share template Samsung’s deal scaled

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?