⚠ Concentration Runs Through the Same Two CountriesHigh threat

SK hynix (SKHY) — threat to the moat

A limited number of customers, in the two economies conducting a technology dispute with each other -- an exposure no amount of manufacturing excellence answers.

SK hynix states that a substantial portion of its sales is attributable to a limited number of customers located in the United States and China, with the two largest at 14.8% and 12.4% of revenue in the first quarter of 2026 and the largest at 23.9% of revenue for 20251.

Revenue by customer, Q1 2026Largest — 15%Second — 12%Everyone else — 73%The filing places them in the United States and China, and names neither.
Two customers, two countries, and a technology dispute running between them.

That sentence contains two exposures that behave differently and are worth separating.

The first is ordinary concentration. A quarter of revenue in one relationship is a material dependency anywhere, and here the customer is several times the size of the supplier and is buying against a capital budget it can revise in an afternoon.

The second is geographic, and it is why the disclosure names countries rather than industries. A Korean supplier whose demand sits almost entirely in two economies conducting a technology dispute with each other has an exposure no amount of manufacturing excellence answers. Export rules govern what may be sold and what equipment may be installed; SK hynix operates fabs in Dalian and Wuxi and sells into both markets, which places it inside a disagreement it has no standing in.

Being Korean is a partial defence — Korea is not the subject of the dispute, and a Korean supplier is in some respects the neutral option for buyers on both sides.

Watch the revenue derived from Chinese customers and the equipment rules applying to the Chinese fabs. Both are set by governments and neither gives notice.

References
  1. ReportedA 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 the first quarter of 2026 and the largest 23.9% of revenue for 2025.
    SK hynix Inc., Form 424B4 prospectus — risk factors and the offering (SEC, CIK 2120882). 'A substantial portion of our sales is attributable to a limited number of customers located in the United States and China. Our two largest customers represented 14.8% and 12.4%, respectively, of our total revenue in the first quarter of 2026 and our largest customer represented 23.9% of our total revenue in 2025.' DRAM products were 77.3% of total sales in Q1 2026 and 77.1% in 2025; NAND flash 22.0% and 21.3%. NAND mass production is transitioning from 176-layer technology to 238- and 321-layer technologies. The offering was 177,900,000 ADSs at US$149.00 each, representing 17,790,000 common shares against 712,702,365 outstanding, each ADS one-tenth of a share; Baillie Gifford Overseas, funds managed by Coatue Management and Situational Awareness Partners indicated a non-binding interest of up to US$7 billion. — FY2025 and Q1 2026 · publ. 2026-07-10 · source ↗
Sources
Generated September 23, 2026