SK Hynix Pushes Past Packaging Logjam as HBM Capacity Is Spoken For Through 2026

SK Hynix scrambles for HBM packaging capacity as 2026 sold out, tests Intel EMIB with 90% yields; hyperscalers offer to finance expansion.

The memory maker riding Korea’s most spectacular rally is running into an unusual problem: it cannot pack its chips fast enough. With high-bandwidth memory already sold out for all of next year and demand bleeding into 2027, SK Hynix is now scrambling for packaging routes beyond its own facilities and the dominant TSMC ecosystem. That search has led straight to Intel.

The chipmaker is testing Intel’s EMIB (embedded multi-die interconnect bridge) technology, a 2.5D packaging approach that uses tiny silicon bridges embedded in the substrate rather than the large interposer required by TSMC’s CoWoS. Industry sources indicate EMIB substrates have reached yields as high as 90% in recent trials, a figure that makes the technology economically viable for high-volume production. The catch is that EMIB’s bridge area and line density are limited, keeping CoWoS the superior option for top-end GPUs where bandwidth and latency are paramount.

Still, in a market where every bit of packaging capacity is contested, an additional route matters. TSMC’s CoWoS lines have been under pressure for years, with Nvidia alone consuming an estimated 60% of global supply. Broadcom and AMD together account for another 26%, leaving little room for smaller ASIC developers or internal AI chip projects at the hyperscalers. Intel’s EMIB could offer them an opening.

This packaging bottleneck is the reason SK Hynix’s customers are behaving unusually. Alphabet, Meta and Microsoft have reportedly offered to help finance new production lines, including the costly EUV machines needed for advanced nodes. For SK Hynix, the arrangement brings capital and planning certainty, but it also risks capping pricing power through long-term supply contracts — a potential drag on margins in a market that remains acutely tight.

The tightness is real. SK Hynix’s chief financial officer confirmed in October that the company’s entire HBM capacity for 2026 is already allocated. Management has signaled that supply will remain constrained well into 2027, just as the company prepares to ship samples of its next-generation HBM4E memory in the second half of 2026, with mass production slated for 2027. The company is already moving to expand: construction of the second phase of its first Yongin fab cluster, a 31 trillion won ($20.8 billion) project in Gyeonggi Province, begins in August, and a new packaging and test facility in Cheongju is in the pipeline. A separate plant in West Lafayette, Indiana is scheduled to come online in 2028.

The stock closed Thursday at 1,970,000 won, just 0.3% below its most recent high and within striking distance of a $1 trillion market valuation. The year-to-date gain stands at roughly 191%, with a 73% advance over the past 30 days alone. The relative strength index at 68.9 suggests the stock is approaching overbought territory but has not yet overshot, while the spread to the 50-day moving average — over 70% — underscores the velocity of the move.

Samsung remains the biggest competitive variable. Its yield on the newest HBM generation is still below 60%, compared with SK Hynix’s roughly 80% on its latest DRAM process. If Samsung manages to ramp mass production of the new HBM generation in the second half of 2026, the dynamics could shift, potentially trimming SK Hynix’s market share to between 50% and 60%. Brokerages, however, continue to pencil in rising average selling prices for DRAM products this quarter and strong operating margins through 2027 — fundamentals that support the current valuation even after such a steep climb.

Packaging, then, is the frontier that will determine how much of that demand SK Hynix can actually capture. The Intel EMIB tests offer a potential second lane through the bottleneck, but the story will only hold weight if those tests translate into real production capacity. For now, the market is pricing in the promise.