SK Hynix’s High-Wire Act: Balancing HBM Dominance with Diversification as Rivals Ramp Up

SK Hynix shares hit 52-week high on AI memory leadership, but analysts forecast market share erosion by 2027 as Samsung invests heavily in HBM capacity.

The memory giant’s stock closed Wednesday at 1,976,000 Won, a 7.68% daily gain that cemented a fresh 52-week high. The shares have nearly tripled since the start of the year, pushing SK Hynix’s market capitalisation to roughly 1,408 trillion Won. Behind the headline rally lie two competing forces: an unassailable lead in high-bandwidth memory for AI accelerators, and mounting evidence that its grip may loosen as competitors and product mix shift.

The immediate catalyst was a meeting that underscores the company’s privileged position in the AI food chain. Chief Executive Kwak Noh-Jung is in Redmond for the Microsoft CEO Summit, where talks with Satya Nadella and Bill Gates are expected to run until May 14. SK Hynix remains the exclusive supplier of HBM3E memory for Microsoft’s Maia 200 AI accelerator, a chip that boasts 216 GB capacity and 7 TB/s bandwidth — a 30% improvement over its predecessor. Beyond the bespoke high-performance parts, the company is also negotiating long-term supply deals for standard DRAM and NAND flash. That ecosystem already includes Google and AWS, positioning SK Hynix as the go-to memory partner for the hyperscaler club.

Yet even as the stock hits records, analysts are flagging a potential inflection point in the very market that sparked the surge. UBS strategists led by Nicolas Gaudois project that by 2027, SK Hynix and Samsung Electronics will each control roughly 40% of the HBM bit market, with Micron Technology taking the remaining 20%. That would be a marked change from today’s landscape, where SK Hynix commands an estimated 57% of HBM revenue and is forecast to hold between 50% and 62% market share through early 2026, largely thanks to its deep ties with Nvidia.

The shift, according to UBS, comes down to strategy. Samsung is ramping capital expenditure on additional HBM capacity, allowing it to close the gap faster. SK Hynix, meanwhile, is diverting more production lines toward DDR5 and LPDDR5X memory as customers continue to place heavy orders for those mainstream products. The move is operationally sensible — these segments generate reliable revenue today — but it could cede incremental HBM share tomorrow. UBS has lowered its HBM expectations for SK Hynix in the outer years while raising Samsung’s.

Complicating the competitive calculus is labour unrest at Samsung. TrendForce analysts warn that a strike planned for May 21 could prompt clients to redirect orders toward SK Hynix and Micron, temporarily reinforcing SK Hynix’s dominance at a time when it is otherwise expected to concede ground.

The broader memory market provides a supportive tailwind regardless of market share shifts. UBS expects server DDR contract prices to climb nearly 60% in the current quarter, with NAND flash prices rising at a similar pace. JPMorgan forecasts those elevated price levels will persist through 2027 or 2028. For HBM specifically, the bank has lifted its average-selling-price assumptions, projecting a 30% year-on-year increase in 2027. That pricing power helps cushion the impact of any volume market-share loss.

SK Hynix’s financials already reflect the boom. In the first quarter of 2026 — a period widely expected to be another blockbuster — the company recorded record revenue of more than 50 trillion Won and an operating profit of 37.6 trillion Won, propelled by AI memory demand. The numbers also explain why Citigroup recently raised its price target to 3,100,000 Won, implying roughly 57% upside from current levels.

A notable side-effect of the stock’s ascent is a valuation milestone: for the first time in its history, SK Hynix trades at a higher forward price-to-earnings ratio than Samsung. The margin is razor-thin — 6.79 times estimated 2026 earnings versus 6.77 times for Samsung — but the crossover signals that investors are now pricing SK Hynix as the pure-play AI memory champion, not merely the underdog rival.

On the technology front, the company is testing Intel’s EMIB packaging for future HBM generations, a move to secure its long-term leadership in high-performance memory. Yet external risks are gathering. Rising oil prices and a domestic debate in South Korea over profit-sharing from AI-related earnings could darken the mood. The Korea Institute of Finance has lifted its 2026 growth forecast to 2.8%, citing semiconductor exports — overwhelmingly driven by SK Hynix — as the primary engine.

The central question for shareholders is whether SK Hynix can maintain its HBM pole position while satisfying surging demand for standard DRAM and NAND. With Samsung pouring money into capacity, Micron advancing, and customers pressing for diversified supply, the company’s next strategic moves will determine whether the current valuation premium is justified by enduring market leadership.