SK Hynix's AI Boom Fuels Historic Rally as US Tech Titans Front Expansion Costs

A strategic pivot is reshaping South Korea's semiconductor landscape. Faced with capacity sold out across DRAM, NAND, and HBM lines, SK Hynix has started courting its own customers to fund factory expansion. Reports indicate Microsoft, Google, and Amazon are prepared to bankroll capacity additions in exchange for guaranteed future allocations—a direct vote of confidence that has turbocharged the stock and pushed the chipmaker to the brink of a historic valuation milestone.

The shares have soared 191% since the start of the year and roughly 79% in the past month alone, touching a record 1,976,000 won before pulling back slightly on Thursday. That rally lifted the market capitalisation above 1,400 trillion won, closing the gap with arch?rival Samsung Electronics, which stands at around 1,669 trillion won. Some market watchers reckon SK Hynix could overtake Samsung as early as May if the current trajectory holds.

The valuation crossover is equally striking. For the first time, SK Hynix's forward price?to?earnings ratio for 2026, at 6.79, has nudged past Samsung’s 6.77. The gap was far wider a mere three months ago. The reversal reflects SK Hynix's commanding position in high?bandwidth memory (HBM) chips, the specialized components that are indispensable for AI servers and have become the sector’s hottest commodity.

Supply constraints underpin the frenzy. Management has declared that all manufacturing capacity—for DRAM, NAND, and HBM—is fully booked, with some customer orders going unfilled. Goldman Sachs expects the undersupply to persist at least until mid?2027, while officials from the SK Group warn it could stretch into 2030. That long squeeze is precisely why US tech giants are opting to bypass ordinary procurement contracts and invest directly in new fabrication lines.

Should investors sell immediately? Or is it worth buying SK Hynix?

Samsung, meanwhile, faces a different kind of headwind. The national labour mediation authority halted wage negotiations on Wednesday, pushing its union toward an 18?day strike scheduled from 21 May to 7 June. Analysts estimate that any wage increases could cut Samsung’s operating profit by 7% to 12%, and the broader risk of delivery delays or customer defections hangs over the stock. An escalation in the labour dispute would only widen the gulf between the two Korean chip titans.

For all its recent gains, SK Hynix still trades at only six times expected earnings, a fraction of the multiples commanded by US peers in the Philadelphia Semiconductor Index. This so?called “Korea discount” is partly geopolitical, and the company is exploring an ADR listing in the United States later this year to narrow the gap. An American listing would also give institutional investors a more familiar vehicle to bet on the AI memory story.

Competition is already sharpening. Samsung has secured qualification for Nvidia’s new Vera?Rubin platform, and if it successfully ramps production of the next memory generation in the second half of 2026, SK Hynix’s HBM market share could drop to between 50% and 60%. Goldman Sachs advises that the era of extreme outperformance is likely nearing its close, as the valuation discount to Samsung has largely been erased.

SK Hynix at a turning point? This analysis reveals what investors need to know now.

For now, the technical indicators flash caution rather than alarm. The relative?strength index sits near 69, suggesting the stock is richly priced but not yet overheating. The next leg higher depends on whether the Samsung strike materialises and how quickly the customer?financed capacity comes online.

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SK Hynix Stock: New Analysis - 14 May

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