SK Hynix’s Historic Nasdaq Haul Spurs a Tactical Production Pivot as Bulls and Bears Clash Over the HBM4 Timeline

SK Hynix pivots HBM4 capacity to DDR5 for near-term margins up to 90%, stock falls 36% from record high after $26.5B IPO. ADRs surged then profit-taking hit; analysts debate HBM4 pace.

Just days after SK Hynix pulled off the largest initial offering by a non?American company on Wall Street – raising around $26.5 billion through American Depositary Receipts on the Nasdaq – the South Korean memory giant has set off a fresh debate among investors. Reports from late June suggest the chipmaker has redirected some of its planned High?Bandwidth Memory 4 (HBM4) production capacity back to conventional DDR5 memory, a tactical shift that prioritises immediate margins of up to 90% amid acute supply shortages. That pivot, combined with a euphoric?to?sceptical mood swing in Seoul, has left the stock nursing a 36.32% decline from its June 25 record high of 2,987,000 won.

The ADRs themselves debuted at $149 apiece on July 10 and promptly jumped 14% to $170, closing the first session up 12.8%. But the celebration was short?lived. On Monday, the ordinary shares listed on the Korea Exchange slid as much as 11% in intraday trading, with traders attributing the move to straightforward profit?taking. Many of the same institutions that had piled into the US listing were cashing out of the domestic stock, a rotation that compounded an already nervous market: the broader KOSPI index shed 2.8% on the same day.

The selling pressure went beyond mere rebalancing. Ryu Young?ho, an analyst at NH Investment & Securities, pointed to growing doubts about the upcoming quarterly results. Investors had expected a sharp sequential increase in HBM4 shipments, but according to his assessment, the ramp?up is turning out weaker than hoped. Meanwhile, SK Hynix’s heavy exposure to the HBM segment – it commands a 58% revenue share in that market, versus 21% each for Samsung Electronics and Micron Technology – means it benefits less than its rivals from the recent price recovery in standard DRAM chips.

The tactical reallocation to DDR5, first flagged in industry reports around late June, adds another layer of complexity. Critics argue that shifting capacity away from HBM4 to chase near?term profits from DDR5 could signal a slower HBM4 cadence – exactly the sort of window Samsung needs to close the technology gap. Proponents counter that the move is a rational use of the new war chest. The $26.5 billion raised in the US offering is meant to fund a multi?year capacity arms race, and squeezing maximum cash from the current product cycle gives SK Hynix more firepower for the HBM4 ramp in the second half of 2026, when mass production is due to begin.

The technical backdrop mirrors the fundamental uncertainty. The stock closed Friday at 2,180,000 won, leaving it 11.71% below its 50?day moving average of 2,154,260 won. The 14?day relative strength index stands at 39.7, brushing the lower edge of the oversold threshold but not yet breaking decisively into it. Annualised 30?day volatility has soared to 120.43%, a level that underscores how violently the shares are swinging as the market reassesses what growth is already priced in.

A key catalyst lies ahead. Finalised yield data from HBM4 qualification tests with Nvidia, conducted under the multi?year technology partnership announced on June 7, are expected toward the end of the third quarter. If the results hit internal targets, the bull case – anchored by a projected near?doubling of HBM4 prices to $5 per gigabit by 2027 – could regain momentum. If they fall short, the bear scenario gains traction: a valuation air pocket after a 180.95% year?to?date gain, a broken short?term trend, and the risk that the current consolidation gives way to a deeper pullback toward the 100?day moving average of 1,576,760 won.

For now, SK Hynix remains the world’s second?largest DRAM supplier and the dominant force in the cutting?edge memory that powers Nvidia’s AI factories. The market capitalisation has settled around €904 billion. But the whipsaw price action of the past week – from record debut to double?digit daily loss – shows how quickly the narrative can flip when a company’s product roadmap faces even a tactical detour.