SK Hynix’s 200% Surge and 14% Whipsaw: How the Nvidia Co-Development Pact and Massive CapEx Plan Are Reshaping the Trade

SK Hynix posts record Q1 2026 revenue and profit, fueled by deep Nvidia HBM4 partnership, but stock volatility highlights AI trade risks.

The numbers from SK Hynix’s first quarter of 2026 are almost dizzying. Revenue hit 52.58 trillion won, up 198 percent from a year earlier, while operating profit soared 405 percent to 37.61 trillion won. The stock has more than doubled since January, gaining a staggering 200 percent. Yet in a single week, the shares shed between 11 and 15 percent, a vivid reminder that even the hottest AI trade comes with violent oscillations.

The contrasting signals encapsulate the paradox facing investors. On one hand, SK Hynix has locked in an unprecedented strategic partnership with Nvidia, cementing its role as the primary memory co-developer for the chip giant’s Vera Rubin platform. On the other, the stock sits at 2,070,000 won, roughly 15 percent below its 52-week high of 2,407,000 won reached on June 2, and the annualized volatility of around 80 percent marks it as one of the most churning large-cap names in Asia.

A Partnership That Goes Deep Into the Chip

The agreement signed on June 7 goes far beyond a standard supply contract. SK Hynix will co-develop memory solutions for Nvidia’s Vera Rubin architecture, Vera CPUs, RTX Spark PCs, and Jetson Thor robotics chips. Each Vera Rubin NVL72 rack requires 20.7 terabytes of HBM4 memory, delivering aggregate bandwidth of 1.6 petabytes per second — a more than 2.7-fold leap over HBM3E. Morgan Stanley estimates that memory now accounts for a cost share 435 percent higher than in the previous generation, and industry sources peg SK Hynix’s allocation of HBM4 for Vera Rubin at 60 to 70 percent.

The collaboration extends into manufacturing itself. Nvidia will integrate CUDA-X libraries and PhysicsNeMo into SK Hynix’s fabrication workflows to accelerate semiconductor simulations and engineering codes. In parallel, SK Hynix is building digital twins of its factories using Nvidia’s Omniverse, OpenUSD, and cuOpt platforms, with the ultimate goal of a fully autonomous fab by 2030.

Capacity Expansion at Breakneck Speed

To back up the ambition, SK Hynix is spending aggressively. Chief executive Chey Tae-won has pledged to double the company’s wafer production capacity within five years. Major projects are under way in Cheongju and Yongin in South Korea, alongside an advanced packaging facility in the United States. Capital expenditure this year will comfortably exceed the 30.2 trillion won spent in 2025, though management has not given a precise figure.

Already, the company has started shipping samples of the seventh-generation HBM4E, with mass production planned for 2027. The current HBM3E and upcoming HBM4 capacity is sold out well into next year, a reflection of the insatiable demand from the leading GPU developers. That pricing power has pushed margins sharply higher, since premium memory products command significantly better returns than standard DRAM.

The Divergent Forces Driving the Momentum

Among the five momentum stocks tracked in a recent ranking of Asian equities, SK Hynix posted the highest 30-day return at 20.3 percent, followed by Samsung Electronics at 16 percent. The broader picture shows a clear rotation: capital is flooding into AI infrastructure plays while abandoning the once-darling electric-vehicle sector, exemplified by CATL’s 9.5 percent decline over the same period.

SK Hynix’s technology edge is clear — it delivers high volumes of premium memory while competitors still struggle with defect rates — but the concentration of revenue among a small number of AI customers remains a vulnerability. The stock now trades far above its 50-day moving average, and the relative strength index has recently dipped into the 38–40 range, indicating oversold conditions after the pullback.

What Comes Next: Samsung’s Shadow and the Market’s Patience

The biggest near-term risk may come from Samsung Electronics. Its HBM4 qualification with Nvidia is widely expected to be decided in the fourth quarter of 2026. If Samsung succeeds in ramping production on schedule, the premium valuation SK Hynix currently enjoys could come under pressure. If delays persist, SK Hynix’s pricing power and allocation share may expand further.

For now, the market is pricing in a best-case scenario: continued earnings upgrades and sustained demand from Nvidia’s next-generation platforms. But the 14 percent weekly loss that occurred even as the Vera Rubin deal was announced suggests that extreme volatility is baked into the stock. Investors betting on momentum must be prepared for sharp reversals. The next set of quarterly results will confirm whether the aggressive pricing strategy at the high end of the memory market can hold — and whether the rotation into AI chips has further to run.