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SK hynix makes memory chips—the fast working memory and long-term storage inside phones, computers, and data centers—and sells them to the companies that build those devices.
SK hynix is one of the world's biggest makers of memory chips, the component that lets your phone hold apps open and your laptop store files. It sells two main things: DRAM, the fast short-term memory a computer uses while it's working, and NAND flash, the slower storage that keeps data when the power is off. Its customers are the companies that build phones, computers, and servers—and, increasingly, the giant data centers training and running AI.
The memory business is brutally cyclical. When demand is hot, chip prices soar and everyone makes money; when demand cools, prices crash and the same factories that printed profits can bleed losses. SK hynix has ridden that rollercoaster for decades. What changed its fortunes recently was high-bandwidth memory, or HBM—a special stacked version of DRAM that sits right next to AI processors and feeds them data fast enough to keep up. SK hynix bet early on HBM and became the leading supplier to Nvidia, the dominant maker of AI chips, which turned it from a commodity memory maker into a key player in the AI boom. That bet came with a story. SK hynix nearly went bankrupt in the early 2000s and was rescued by a consortium of Korean banks, later coming under the SK Group umbrella. It also weathered a major price-fixing scandal that brought fines from regulators. Today its biggest competitive threats are Samsung, its hometown rival, and Micron, plus the ever-present risk that memory prices turn down again or that AI spending slows. The company pours cash into new factories—chip plants cost tens of billions—because falling behind on capacity or technology can be fatal in this business.
The company started life as a construction firm, but in 1983 it jumped into microchips, phones and disk drives under the name Hyundai Electronics — at a time when American and Japanese giants already owned the semiconductor market. Early technical problems nearly killed it, but it bet on hiring good people and spending on research, and by 1987 it had its own memory chip, followed by its first profit a year later. The pattern was set: come late, struggle, then catch up by outworking and outspending.
When the Asian financial crisis hit, Hyundai grabbed LG Group's chip operations, briefly creating one of the biggest semiconductor companies in the world. But the merger was a mess — losses and debt piled up fast, and the combined firm was soon fighting for its life.
To stay alive, the company went through painful restructuring: cost cuts, job losses, and a new name — Hynix Semiconductor, a blend of "high" and "electronics" — to show chips were now the whole point. It split from Hyundai and finally began turning a profit.
A brutal recession, crushing debt, and the dot-com collapse forced the company into a creditor rescue program. Employees gave back salaries and took unpaid leave, and locals launched campaigns to support the recovery — the experience forged the "one-team" spirit the company later credited for its comebacks.
Hynix lacked the cash for the investments survival required, so telecoms conglomerate SK Group bought it and renamed it SK hynix. Its former engineer CEO poured resources into high-bandwidth memory, or HBM — a type of chip that was unprofitable at the time but would later become essential to AI servers.
The SK hynix launch began a decade of heavy spending on factories and acquisitions. Market value grew from 13 trillion won to almost 100 trillion, and the company went from a smaller memory maker to a flagship of SK Group.
SK hynix announced the biggest deal in its history: buying Intel's NAND and solid-state drive business. The move was meant to lift its flash memory business into the global top tier, and the acquired assets later became a subsidiary called Solidigm.
Solidigm had lost money for years, with cumulative losses over 7 trillion won. Then in one quarter of 2024 it posted its first profit in twelve quarters, as AI data centers hungered for high-capacity enterprise SSDs — which joined HBM as the two pillars of SK hynix's AI memory business.
SK hynix became the first company to finish developing HBM4 and set up mass production, shipping from late 2025. It was also the first in the memory industry to use production High NA EUV, the most advanced chip-making equipment.
SK hynix listed on Nasdaq, raising roughly $26.5-28 billion in one of the largest share sales ever by a foreign company. The goal was to fix its lower valuation on the Korean exchange versus US peers, and the money was earmarked for new chip factories, including a cluster in southwestern South Korea.
The stock soared 12.8% on its Nasdaq debut, then crashed 15.4% in Seoul two trading days later — its steepest one-day fall on record. The drop triggered a market-wide halt as the Kospi plunged 9%, a sharp reminder of how much of the AI rally ran on hype.
SK hynix dropped a planned $10 billion US listing of its Solidigm unit after regulators and shareholders objected over dilution and group ownership structure. The reversal was seen as a major positive for Korean corporate governance and minority shareholders, and the company said Solidigm's growth prospects and investment needs were unchanged.
Revenue passed 100 trillion won for the first time in a quarter, with operating profit up 632% year on year on AI demand and HBM4 shipments. Management said AI memory capacity is effectively sold out through 2029, expects shortages through 2030, and announced an unprecedented shareholder return plan of about $75 billion for the year.
So the simple version: SK hynix sells the memory that makes modern computing possible, and right now the AI gold rush has made its fastest chips scarce and valuable. The catch is that memory is a boom-and-bust business, and the same plants cranking out record profits today could be a drag when the cycle turns.
Saved answer · last researched 19 Oct 2026