SK hynix — 000660.KS

Technology · Semiconductors · KRX (local listing)

About SK hynix

SK hynix Inc. through its subsidiaries, engages in research, develops, manufactures, distributes, and sells semiconductor devices in Korea, China, rest of Asia, the United States, Europe, and internationally. It offers DRAM, such as server memory, graphics memory, mobile memory, PC memory, consumer memory; NAND flash memory; SSD; and MCP products. It also engages in foundry business, produces non-memory semiconductors. The company serves its products for server, networking, mobile, personal computer, consumer, and automotive applications. The company was formerly known as Hynix Semiconductor Inc. and changed its name to SK hynix Inc. in March 2012. SK hynix Inc. was incorporated in 1949 and is headquartered in Icheon-si, South Korea.

The global AI memory chain

Memory is where the AI build-out is most supply-constrained: high-bandwidth memory (HBM) feeds the accelerators, and data-center DRAM and NAND scale with every new cluster. The industry is a tight oligopoly — Samsung, SK hynix and Micron in DRAM; those plus Kioxia and Sandisk in NAND — famous for brutal boom-bust cycles: shortages mint record profits, then capacity catches up and prices collapse. SK hynix is the world's #2 DRAM maker and the early leader in high-bandwidth memory (HBM) for AI accelerators — Nvidia's primary HBM supplier through the AI build-out, which puts it at the very center of the AI-memory upcycle and squarely inside memory's boom-bust cycle.

Key data · local session close, delayed · as of 8 July 2026

Valuation read

What the price implies: after the global AI-memory run (+744% in a year on the local line), SK hynix trades on a forward P/E near 5× — like the rest of the memory complex, the market is treating current earnings as close to a cycle peak rather than a new baseline. Cyclicals at peak earnings can look deceptively cheap on multiples; that's the cycle speaking, not automatically value. Compare the US-listed peers with the fair-value calculator.

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The memory complex

SamsungKioxiaNanyaWinbondMUDRAM ETF

See the full picture on the AI stocks bubble map, or gauge froth with the AI bubble-risk index — and stress-test your memory exposure with the portfolio stress test.

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