SK Hynix Channels AI Super-Cycle with Record Capacity Build and Vera-Rubin Tie-Up

SK Hynix partners with Nvidia for Vera-Rubin supercomputers, plans two new fabs by 2027; stock jumps 16% as HBM dominance solidifies.

The stars are aligning for SK Hynix in a way that blends operational heft with strategic dealmaking. As the memory chip giant gears up to fire two new fabrication plants in the next eighteen months, a freshly inked partnership with Nvidia has sent its shares racing 16% higher in a single session — a snapshot of the volatile, high-stakes game that defines today’s AI semiconductor market.

South Korea’s KOSPI benchmark surged more than 8% on Tuesday, rebounding from a brutal sell-off the previous day, and SK Hynix led the charge. The stock closed at 2,215,000 KRW, trimming the gap to its 52-week high to just 8% — a sharp improvement from the 14% deficit that had persisted only days earlier. Year-to-date, the shares have now piled on 227%, a blistering run that underscores just how aggressively the market is pricing the AI memory cycle.

The Vera-Rubin Pact Goes Deeper Than Memory

At the heart of the latest leg up is a multi-year technology collaboration with Nvidia. Under the deal, SK Hynix will develop customised memory chips for Nvidia’s next-generation Vera-Rubin supercomputers, extending the partnership beyond the current HBM4 roadmap into robotics platforms and broader AI infrastructure. The agreement locks SK Hynix even more tightly into the booming demand for data-centre hardware, precisely as it races to expand production.

Those expansion plans are already taking concrete shape. The Fab M15X in Cheongju is scheduled to start operations in the second half of 2026, initially processing 40,000 wafers per month and doubling that to 80,000 by 2027. A second facility, housed in the Yongin Semiconductor Cluster, will begin equipment installation in the first clean room in February 2027. Together, the two projects represent one of the largest capacity build-outs in the company’s history, timed to capture what analysts see as DRAM shortages extending through the end of the decade.

Dominance in High Bandwidth Memory

SK Hynix already commands a 58% share of the global high-bandwidth memory (HBM) segment as of the first quarter of 2026 — a dominant position that makes it an indispensable supplier for Nvidia and other AI chipmakers. HBM is the critical enabler for large language models and graphics processors; without it, the most advanced AI systems grind to a halt. The capacity ramp-up is designed to lock in long-term supply contracts and pricing power, ensuring that SK Hynix remains at the centre of the AI supply chain for years to come.

Yet the ride is anything but smooth. The stock’s annualised volatility hovers around 99% — a hair below the 102% level seen earlier this year — reflecting how quickly sentiment can flip. A week-on-week basis still shows a 3.6% decline despite Tuesday’s surge, evidence that the recent correction is not fully retraced.

Foreign Flows Tell a Different Story

The rally on Tuesday was broad: 774 stocks advanced on the KOSPI against just 133 decliners. But beneath the surface, a familiar pattern persisted. Foreign investors continued to pull capital out of the market, net selling approximately two trillion won. Domestic institutions stepped in as net buyers, propping up prices. That split suggests the current recovery is being driven by short-term positioning rather than a fundamental return of international confidence.

The trading range remains extreme. SK Hynix now trades 47% above its 50-day moving average, a stretched gap that makes the stock vulnerable to sharp reversals. With the Nvidia partnership reinforcing the long-term narrative but foreign selling unresolved, the stock is likely to remain a high?octane play — one where every new headline from Cheongju or Santa Clara can send the price swinging.