After Gas Leak Scare, SK Hynix Doubles Down on Custom HBM as Record Cash Piles Fuel AI Ambitions

SK Hynix announces custom HBM (cHBM) at GTC Taipei, shifting from commodity supplier to full-stack AI memory creator. Despite a factory fire, production unaffected. Record Q1 2026 revenue of 52.6T won, 72% margin, net cash 35T won. Shares near 52-week high.

SK Hynix is rewriting its playbook. At NVIDIA’s GTC Taipei conference on June 1, SK Group Chairman Chey Tae-won and SK Hynix CEO Kwak Noh-jung laid out a vision that shifts the company from a commodity memory supplier to a “Full-Stack AI Memory Creator.” The centrepiece is customised High Bandwidth Memory, or cHBM, designed to embed itself into the architecture of individual AI accelerators rather than serving as a one-size-fits-all chip. The message arrived just days after a factory incident tested, but failed to disrupt, the company’s operational momentum.

That incident occurred on Monday morning at 10:32 local time in Cheongju, when a fire broke out in a gas room at the M15 facility. A hydrogen fluoride leak of 5.3 ppm triggered the evacuation of 3,600 workers from the M15 and M15X buildings. The blaze was extinguished within ten minutes, but eleven employees sustained injuries — five of them reporting eye irritation. SK Hynix confirmed later that day that production equipment had not been affected and no delays were expected. Crews returned to the halls by 13:38, though the cause of the fire remains under investigation.

The market took the news in stride. SK Hynix shares closed Monday at 2,363,000 won, a 1.29 per cent gain, as investors bought into the company’s assurance that output was unscathed. The stock now trades around 2,360,000 won, less than 0.2 per cent from its 52-week high, with a relative strength index of 68.9 — strong but not yet in overbought territory. Since the start of 2026, the equity has climbed more than 240 per cent.

That breathtaking rally rests on financial results that are equally striking. In the first quarter of 2026, SK Hynix posted revenue of 52.6 trillion won and an operating profit of 37.6 trillion won, translating to a 72 per cent operating margin. Net profit reached 40.3 trillion won. Cash on hand ballooned to 54.3 trillion won, while net debt turned negative as the company now holds 35 trillion won in net cash against interest-bearing borrowings of just 19.3 trillion won.

The record cash pile opens the door for aggressive investment. Management has flagged a marked increase in capital spending during 2026, focused on the ramp-up of the M15X line, infrastructure for the Yongin cluster, and key equipment such as EUV lithography tools. The spending is aimed squarely at securing SK Hynix’s position in the AI memory arms race.

The strategic pivot outlined at GTC Taipei is designed to make those investments count. Rather than competing purely on wafer output, SK Hynix now wants to be involved earlier in the design phase of its customers’ systems. Alongside cHBM, the company is developing HBM4, High Bandwidth Flash, and 3D stacked DRAM on Logic — technologies that merge memory and processing. The goal is to embed SK Hynix memory so deeply into next-generation chips that rivals cannot easily replicate the relationship.

NVIDIA remains the most critical partner in that effort. At GTC Taipei, Kwak attended a separate “Korean Partner Night” hosted by Jensen Huang, where executives from major South Korean companies discussed not only HBM but also robotics, automotive, cloud and IT services. Chey Tae-won watched Huang’s presentation on the Vera Rubin roadmap, signalling close alignment between SK Hynix and NVIDIA’s future platforms.

For investors, the calculus is shifting. The days of valuing SK Hynix solely on DRAM and NAND pricing are fading. The new metric is design wins — how deeply the company’s custom memory technologies are wired into the next generation of AI accelerators. The recent fire, while contained and without production impact, serves as a reminder that operational snafus can still rattle sentiment in a market that hungers for every bit of AI memory. The company’s official findings on the cause will be watched closely. For now, SK Hynix has three things working in its favour: a safety incident that caused no downtime, a record balance sheet, and a strategic shift that positions it as a design partner rather than a mere supplier.