SK Hynix Pulls Forward Yongin Fab to Early 2027 as Yield Edge Over Samsung Hardens

SK Hynix shares soar 11% as Nvidia earnings fuel rally; company speeds Yongin clean room opening to Feb 2027, achieves 80% 1c DRAM yield, and reports record Q1 2026 revenue of 52.6 trillion Won.

South Korea’s chipmaking titan keeps delivering surprises. SK Hynix shares surged more than 11% on Thursday, riding a wave of Nvidia’s blowout quarterly numbers and sending the KOSPI to its biggest single-day point gain in history. The stock closed at 1,940,000 KRW, up 58.63% in the past month alone and an eye-popping 186.56% since the start of the year.

That rally has been fueled by more than just AI hype. Behind the scenes, SK Hynix is accelerating its factory buildout at a pace that caught even seasoned observers off guard. The company has pulled forward the opening of its first clean room at the massive Yongin semiconductor cluster from May 2027 to February 2027. For the Cheongju M15X DRAM facility, it is installing equipment roughly two months ahead of schedule and adding a second clean room dedicated to HBM3E and HBM4 production.

The urgency reflects a market that has run out of room. SK Hynix has openly stated that its DRAM, NAND and HBM lines are sold out, and not every customer order can be fulfilled. Goldman Sachs sees the undersupply persisting through at least the first half of 2027, while TrendForce expects DRAM contract prices to jump 58-63% in the second quarter of 2026 and NAND prices to surge 70-75%.

Yield Becomes the Real Bottleneck

Capacity expansion is only half the story. As HBM stacks more DRAM layers, any backend defect becomes extremely costly, so SK Hynix is converting part of its Cheongju campus into a wafer-testing hub. The company’s 1c DRAM yield has reached 80%, a sharp contrast to Samsung’s HBM4 yield, which remains stuck below 60%. That gap matters when every percentage point of yield improvement directly boosts both delivery capability and margins.

Samsung’s labor troubles are adding to SK Hynix’s tailwind. A potential 18-day strike looms at Samsung starting May 21. SK Hynix, meanwhile, has locked in a 10% profit-sharing agreement with its own workers, keeping the peace during the critical HBM4 ramp.

Record Results Finance the Blitz

The expansion comes with a price tag that SK Hynix can easily afford right now. First-quarter 2026 revenue hit 52.6 trillion Won, the first time quarterly sales have crossed the 50-trillion mark. Operating profit soared to 37.6 trillion Won, translating into a stunning 72% operating margin for a memory maker. Capital spending in the quarter reached 7.35 trillion Won, up 22% year-over-year, with much of that flowing into the Yongin complex.

Total investment for the first Yongin fab has now been raised to roughly 31 trillion Won, up from the 21.6 trillion announced earlier. At full capacity, the initial phase will add about 350,000 wafers per month, lifting SK Hynix’s total monthly output to around 900,000 wafers.

Next-Gen Memory on the Horizon

While construction crews race, the technology road map is equally aggressive. SK Hynix plans to deliver HBM4E samples in the second half of 2026 and start mass production in 2027. The core die already uses the mature 1c nanometer process that began volume output at the end of 2025, a crucial factor for AI customers who demand predictable supply.

The company is also making strides in low-power memory. LPDDR6 promises a 33% increase in data-processing speed and more than 20% better energy efficiency. Broad shipments are slated for the second half of 2026, initially targeting the next flagship smartphone from a major client.

Market Frenzy and a Cautionary Note

The stock’s meteoric rise has drawn in institutional investors in a big way. On Thursday alone, they net bought over 1.4 trillion Won of SK Hynix shares, even as foreign investors extended their selling spree to an 11th consecutive session. Retail investors, according to a Samsung Securities analysis, have been “pyramiding” their positions—adding to holdings as the price climbs—signaling strong conviction in the memory supercycle.

Nomura Securities has lifted its KOSPI target for 2026 to as high as 11,000 points, explicitly citing HBM demand as the primary engine. At the same time, SK Hynix’s relative strength index sits near 69, a level that often precedes a pullback. If foreign selling continues, the stock could face a rapid correction from these lofty valuations.

For now, the next catalysts are clear: HBM4E samples due later this year and the relocated Yongin opening in February 2027. If SK Hynix can hold its pace, protect its yield advantage and keep labor peace, it will remain firmly in the driver’s seat of the global AI memory market.