Three trillion-dollar chipmakers, and still not enough memory
The AI rally that pushed Samsung, SK Hynix, and Micron past US$1 trillion is the same force driving memory prices up 63%, and there's no relief in sight before 2028.
It takes a particular kind of supply crisis to mint three trillion-dollar companies in three weeks. Samsung crossed the mark on May 6. Micron followed on May 27. SK Hynix completed the set on Wednesday with shares swinging as high as 14.9% before settling at a 9.3% gain and a US$1.12 trillion valuation. The common thread is not innovation or a product launch. It is scarcity, and the AI industry's near-total dependence on high-bandwidth memory (HBM) that the world's biggest chipmakers still cannot produce fast enough.
South Korea is now the first country outside the United States to have more than one trillion-dollar company. There are only three Asian firms in that club at all, TSMC, Samsung, and SK Hynix, and every one of them is a semiconductor business. That concentration is not coincidental. It reflects where the global technology stack has placed its deepest dependency.
A rally built on scarcity
The numbers tell the story plainly. Memory chip prices doubled in the first quarter of 2026 compared to the previous period and are forecast to climb a further 63% this quarter, driven by data centre demand that has simultaneously squeezed supply for consumer devices–smartphones, laptops, automobiles. The chipmakers are posting record profits.
Everyone further down the chain is absorbing record costs. Kim Young-gun, an analyst at Mirae Asset Securities in Seoul, expects memory chip demand to continue exceeding supply through 2028, a outlook that led the firm to raise its target prices for SK Hynix and Samsung by nearly 19% and 15% respectively.
UBS, meanwhile, more than tripled its Micron target price in a single report, pointing to how AI has fundamentally reordered the economics of the entire memory market. Samsung shares have risen 149% this year. SK Hynix is up 215%. Micron has climbed 245%. These are not incremental re-ratings. They reflect a market that has stopped treating memory as a commodity and started pricing it as critical infrastructure.
The concentration risk hiding in plain sight
Wednesday's session deserves a closer read. South Korea's KOSPI hit an all-time high of 8,457.09, briefly triggering a sidecar curb that halted algorithmic trading. Samsung and SK Hynix alone accounted for half the index by market capitalisation. And yet of the 918 regular shares traded on the benchmark, only 75 advanced. 826 declined.
The retail frenzy that followed only sharpened that contrast.South Korea launched its first single-stock leveraged ETFs linked to Samsung and SK Hynix on Wednesday, and they immediately posted double-digit gains. Demand was so intense that the Korea Financial Investment Association's website, which hosts mandatory courses required before accessing leveraged ETFs, crashed under the traffic.
Financial investment firms were net buyers of 1.3 trillion won in KOSPI shares. Foreign investors were net sellers. The dynamic is familiar: domestic retail capital chasing momentum in a structurally narrow rally, amplified by leverage products that accelerate both the upside and the eventual correction.
What the milestone actually signals
Three memory chipmakers crossing US$1 trillion in three weeks is less a celebration than a signal. The AI infrastructure build-out is real, the demand is structural, and the supply constraints will not resolve quickly. But a rally of this scale, built on a forecast that demand will outstrip supply for at least two more years, is simultaneously a valuation story and a warning about what happens downstream when the cost of a critical component rises 63% in a single quarter.
Memory has moved from the back of the bill of materials to the front of every AI infrastructure conversation. The companies that control it are now worth a trillion dollars each. The industry that depends on it is still doing the arithmetic.