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SK hynix designs and manufactures memory semiconductors — DRAM, NAND flash and, since 2023, high-bandwidth memory (HBM) stacks used in AI accelerators. It is the second-largest memory maker in the world after Samsung Electronics and the primary HBM supplier to Nvidia.
Samsung Electronics is two businesses under one ticker, and in 2026 one of them is carrying the other. Device Solutions (DS) is the chip half: it makes memory — DRAM and NAND flash, plus the stacked high-bandwidth memory (HBM) that sits beside Nvidia's AI accelerators — and it also runs a foundry, a contract manufacturing arm that builds other companies' chip designs in competition with TSMC, and System LSI, which designs Samsung's own Exynos processors and image sensors.
Hanmi Semiconductor makes the thermo-compression bonders used to stack HBM dies. SK hynix is its largest customer, so its order book is a read on HBM capacity..
Leeno Industrial makes test probes and sockets used to test memory and logic chips. It sells into the back end of the same supply chain..
Wonik IPS builds deposition and etch equipment for memory fabs. Its revenue tracks Korean memory capex..