SK Hynix Navigates Gas Scare at Key Facility While Cementing Role in Nvidia’s Vera Rubin Era

A fire and hydrogen fluoride leak at SK Hynix's Cheongju campus forces evacuation of 3,600 workers, yet shares close at 52-week high amid AI-driven HBM demand and Nvidia partnership.

A fire and hydrogen fluoride leak at SK Hynix’s Cheongju campus on Monday forced the evacuation of roughly 3,600 workers from its M15 and M15X plants, yet the stock still closed at a fresh 52-week high of 2,363,000 won. The juxtaposition of a safety incident with a record-breaking share price underscores the conflicting forces shaping the Korean chipmaker’s narrative: operational risk versus an AI-driven demand cycle that shows no sign of cooling.

The trouble began at 10:32 local time in a gas room on the sixth floor of Campus 4, a facility that connects the M15 and M15X production lines. Sprinklers quickly extinguished the blaze, but sensors detected hydrogen fluoride at 5 parts per million — above the legal threshold of 3 ppm. Between six and eleven employees were taken to a company hospital with eye irritation; none suffered serious injuries. SK Hynix evacuated M15 and M15X as a precaution, though workers later returned and the company stressed that operations remained stable and production was uninterrupted. The incident raises questions about potential regulatory follow-up, especially since M15X is earmarked for next-generation DRAM, including the high-bandwidth memory (HBM) that is the profit engine of the current AI investment cycle.

That profit engine just got a powerful new ignition source. At Nvidia’s GTC Taipei 2026, CEO Jensen Huang officially named SK Hynix as one of three HBM4 suppliers — alongside Samsung Electronics and Micron — for the upcoming Vera Rubin platform. The system, now in full production, targets “agentic AI factories” and promises ten times the throughput of the Grace-Blackwell generation. Deliveries are slated to begin this autumn. SK Hynix chairman Chey Tae-won and CEO Kwak Noh-jung sat in the front row during the keynote, a visible signal of the company’s intent to deepen its already close ties with Nvidia.

But the real strategic pivot lies beyond standard HBM. SK Hynix is repositioning itself as a “full-stack AI memory creator” with a heavy emphasis on custom HBM, or cHBM. The goal is to design memory solutions tailored to individual customer architectures, embedding the company into clients’ early design phases. This shift from commodity to value-added, higher-margin products — supplemented by technologies like High Bandwidth Flash and 3D Stacked DRAM on Logic — is meant to pull SK Hynix out of a pure supplier race and lock in differentiation against Samsung and Micron.

The financials provide ample ammunition for that ambition. In the first quarter of 2026, SK Hynix posted revenue of 52.6 trillion won and an operating profit of 37.6 trillion won, fueled by HBM, high-capacity server DRAM modules, and enterprise SSDs. Management is pushing ahead with expansion plans around the M15X ramp, the Yongin cluster, and new EUV installations. The broader South Korean export data for May reinforced the tailwind: total exports surged 53.2% year-on-year, while semiconductor shipments rocketed 169.4%.

That momentum has supercharged the stock. With a year-to-date gain of 249%, SK Hynix shares have more than tripled, pushing the relative strength index to 68.9 — elevated but not yet in overbought territory. The KOSPI index itself hit a record high on Monday, with Samsung leaping 9.70% and SK Hynix adding 1.29%.

The open question is whether the gas leak will trigger any lasting operational constraints. Korean authorities could impose additional safety conditions on cleanroom operations or chemical handling, especially after a hydrogen fluoride breach at a core facility. For now, SK Hynix has kept both M15 (NAND flash) and M15X (future DRAM) running smoothly. The market is betting that the Vera Rubin ramp — and the allocation of HBM4 business — will be decided by yield, qualification rates, and the ability to mass-produce custom solutions, not by a single safety incident. The cHBM strategy is the linchpin: if the first custom orders materialize as planned, SK Hynix will have successfully climbed the value chain. If not, the competition from Samsung and Micron remains fierce. Monday’s fire and the Vera Rubin announcement both made clear that the stakes could not be higher.