Afternoon update 5:12 PM ET

Memory Report — 2026-07-15

SK Hynix's official 12-layer HBM4 volume production for Vera Rubin, the ADR record high with US options launch, Samsung's early-stage ADR exploration, and Barclays' initiation. These are distinct from the earlier brief. Writing the article.

SK Hynix moved from sample to final specification, kicking off volume shipments of its 12-layer HBM4 to Nvidia's Vera Rubin platform, the first HBM4 delivered under full production terms rather than as qualified samples.

The chip is now in a capacity ramp. SK Hynix announced it has officially initiated mass production and shipments of 12-layer HBM4 to Nvidia, and unlike previous supply that was classified as samples, this is the first time HBM4 is being delivered with final specifications that have completed all quality certifications for Nvidia's next-generation Vera Rubin platform. The 12-layer HBM4 chips have already passed Nvidia's quality certification, and the company plans to sharply accelerate deliveries from September onward to meet demand for high-end AI hardware. That timeline matters because HBM4 is the memory Nvidia's Q3 platform depends on, and SK Hynix enters the ramp from a position of dominance: in the first quarter of 2026, SK Hynix commanded a 56.4% revenue share of the global HBM market, a lead no rival has come close to challenging.

The market reaction was immediate on the US tape. On July 14, the SK Hynix ADR surged 17% to a record high of $178.66, driven by robust investor interest and active options trading, particularly in short-term calls, as the company commenced mass production and shipments of 12-layer HBM4 for Vera Rubin. The ADR erased all losses since its debut, and options on the stock began trading that day on the US options exchange. The listing has now drawn a second Korean giant toward Wall Street: Samsung Electronics may also seek a US listing, with media reports indicating it is in the early stages of exploring the possibility of issuing American Depositary Receipts, having held preliminary discussions with banks but not yet decided whether to proceed.

Sentiment got a further push from a fresh sell-side call. SK Hynix stock jumped 12.8% and SK Square surged 20% as Barclays predicted the stock would double. The bull case rests on scarcity that is deepening, not fading: SK Hynix CEO Kwak Noh-jung expects the global memory industry to face its worst-ever supply shortage in 2027, with demand continuing to exceed the company's production capacity well beyond 2030 despite aggressive expansion.

On the storage side, the leading edge keeps advancing. On July 3, Kioxia and Sandisk announced the start of production for their 10th-generation 3D flash memory at the Fab2 facility in Kitakami, Japan, part of a multi-year effort to increase capacity to meet rising demand for NAND flash, particularly for AI-driven applications. The new BiCS10 TLC NAND is aimed at density and performance-sensitive data center applications, featuring a 332-layer architecture, greater than 29 Gb/mm2 density, and a 4,800 MT/s transfer rate for SSDs with PCIe 5.0 and 6.0 interfaces.

Watch the September HBM4 delivery ramp for confirmation that SK Hynix can convert its lead into shipped volume, and whether Samsung's ADR exploration hardens into a filing.

July 15th, 2026

Memory Report — 2026-07-15

Sources