SK Hynix’s iHBM Cooling Tech and Anthropic Alliance Create a Dual Moat Against Mounting Competition

SK Hynix surpasses $1 trillion market cap, debuts iHBM cooling for next-gen HBM5, reports record profits, but faces price war from Chinese rival CXMT.

SK Hynix has just notched a pair of milestones that, together, tell the story of a company at the apex of its power — yet still facing a two-front competitive threat. The South Korean chipmaker crossed the trillion-dollar market capitalisation threshold for the first time, and simultaneously unveiled a novel cooling technology designed to lock in its lead in the next generation of high-bandwidth memory.

The heart of that technology is iHBM. SK Hynix embeds non-conductive silicon cooling elements directly into the die-to-die physical layer — the high-speed interface between the HBM base die and the AI processor where thermal stress peaks under extreme data throughput. The architecture cuts thermal resistance by 30%, allowing stable operation even in racks consuming up to 230 kilowatts, the kind Nvidia’s upcoming Rubin Ultra and Feynman accelerators will demand. Critically, iHBM can be manufactured using existing packaging lines based on SK Hynix’s MR-MUF process, meaning clients can adopt the solution with minimal design changes. The technology is slated for HBM5 and subsequent generations.

The cooling advance arrived during a banner week for the stock. Shares closed Friday at 2,333,000 Won, a new 52-week high, after gaining 1.92% on the day. The year-to-date rally now stands at roughly 245% — more than tripling the stock. That run has lifted SK Hynix into the trillion-dollar club alongside Samsung Electronics and Micron Technology. Together, Samsung and SK Hynix now account for more than 40% of the KOSPI index, which itself has surged 95% this year to a record close of 8,476 points.

The financial momentum behind the valuation is towering. In the first quarter of 2026, SK Hynix posted an operating profit of 37.6 trillion Won, a 400% leap from a year earlier. Revenue doubled to 52.6 trillion Won, and the operating margin hit 72%. DRAM prices rose 100% in the quarter, with a further 63% increase expected in the second quarter. HBM capacity is sold out for the entire year, and the order book for 2026 is already full, with supply tightness stretching into 2027. Goldman Sachs has called the projected DRAM supply deficit for 2026 the worst in 15 years, noting that building a new fabrication plant takes four to five years.

Yet even at these heights, two threats are converging. On the commodity front, Chinese rival ChangXin Memory Technologies (CXMT) has doubled its global DRAM market share to 8% in just one year, from 3% previously. On 27 May, CXMT passed its IPO review for the Shanghai STAR Market, aiming to raise about 295 billion Yuan — equivalent to roughly 6.5 trillion Won. CXMT is undercutting standard DRAM products from Korean makers by 15–20%, a flanking attack that targets the volume segments while SK Hynix and Samsung focus on high-bandwidth memory for AI.

SK Hynix countered that threat the very next day. On 28 May, it was confirmed as a partner in Anthropic’s Series H financing round, which raised $65 billion and valued the AI company at $965 billion. The chipmaker supplies the essential HBM modules for Anthropic’s language models, locking in long-term revenue that reduces exposure to the volatile standard-chip business.

The second threat comes from Samsung, which is scrambling to close the gap in HBM. Samsung’s HBM4 yield currently sits below 60%, while SK Hynix has already reached 80%. Should Samsung bring HBM4 into mass production in the second half of 2026, SK Hynix could see its market share slip to 50–60%, hitting its premium valuation. Analyst Peter Kim of KB Securities noted to CNBC that SK Hynix and Samsung trade at roughly six to seven times annual earnings, while Micron fetches twice that multiple. Kim Young-gun of Mirae Asset Securities has raised his price target by nearly 19% to 3.8 million Won, betting that memory chip demand will outstrip supply until at least 2028.

But the sheer weight of the two Korean giants in the KOSPI is a vulnerability in itself. With two stocks constituting almost half of the benchmark, any disruption in the supply chain or a pullback in global data-centre investment would ricochet through the entire index. SK Hynix is also exploring a US listing to broaden its investor base.

For now, the company is operating from a position of maximum strength: record profits, sold-out capacity, a cooling innovation that raises the bar for HBM5, and a strategic AI alliance with Anthropic. The open question is how long the margins in the commodity chip business can hold against CXMT’s price war — and whether Samsung can finally turn its yield problem around.