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SK hynix Inc.

SK hynix makes memory chips that store and move data inside computers, phones, and massive AI data centers.

SK hynix sells memory chips. There are two big kinds. The first is DRAM, the fast working memory your computer uses right now while it's on. The second is NAND flash, the storage that holds your photos and files even after the power goes off. Around 80% of revenue comes from DRAM and the rest mostly from NAND. Its customers are not you and me. They are the giant device makers and server builders: companies making smartphones, laptops, and the vast data centers that run everything from search to AI. When you ask an AI chatbot a question, huge amounts of memory are working behind the scenes, which is why this business is suddenly booming.

Think of it as the short-term desk space and long-term filing cabinet inside every computer. DRAM is the desk: the bigger it is, the more tasks a machine can juggle at once. NAND is the filing cabinet: the bigger it is, the more stuff you can keep. The company's big bet today is a premium kind of DRAM called HBM, or high-bandwidth memory. It stacks memory chips vertically and wires them directly next to powerful AI processors, letting data flow far faster. AI chips like those from NVIDIA need HBM the way a race car needs a bigger fuel line, and SK hynix has been the leading supplier. That has turned a historically brutal, boom-and-bust chip business into something closer to a gold rush.

Memory chips are a commodity, so prices swing hard. When demand is hot, profits soar; when it cools, the industry bleeds. SK hynix survives these cycles by staying at the front of the technology curve, spending heavily on new factories and next-generation chips, and keeping tight ties with the biggest buyers. The company is headquartered in Icheon, South Korea, and has grown from a troubled chipmaker into one of the two or three most important memory suppliers on Earth. Its free cash flow mostly goes right back into building fabs and developing denser, faster chips, because in this game falling behind on the technology is far more dangerous than a bad quarter.

Saved answer · last researched 13 Oct 2026