CXMT, China’s largest maker of DRAM — the memory that sits next to every AI accelerator on earth — began trading Monday on the Shanghai Stock Exchange’s STAR Market. The IPO priced at 8.66 yuan, roughly $1.30 a share. The stock opened at 49.50 yuan, a gain of about 472%, and was still up around 466% by early afternoon. The offering raised at least $8.6 billion, with reports putting the figure near $9.8 billion once the over-allotment option is counted — Asia’s largest listing of 2026 and mainland China’s biggest since 2010.
The number that matters is not the pop. It is the distance between two valuations of the same company, one week apart. During the IPO process CXMT was carried at roughly $85 billion. Within minutes of the open it was worth about $487 billion, which makes it the most valuable company listed on a mainland exchange — ahead of the state banks that have held that title for a generation.
The demand is not imaginary. Memory is the tightest link in the AI supply chain: customers are asking for up to 100% more capacity in 2027 than anyone has agreed to build, contract prices have been climbing for a year, and Beijing has spent the cycle pushing hard for self-sufficiency in exactly this component. CXMT is the company inside the country best positioned to supply it.
What $487 billion doesn’t buy
Lithography. CXMT operates under US-led restrictions on advanced chipmaking equipment, which means its roadmap is constrained not by capital — it now has more of that than almost anyone — but by the tools it is permitted to purchase. A war chest of $8.6 billion buys fabs, wafers, engineers and years of losses. It does not buy an EUV machine, and no amount of domestic enthusiasm changes the export-control list.
That is the tension the price is papering over. Every dollar of the valuation assumes CXMT closes the process gap against Samsung, SK hynix and Micron on schedule. The restrictions exist precisely to make that schedule slip.
Our take: A 472% first-day move is not a verdict on the company, it is a measurement of trapped capital. Mainland retail money has limited places to express an AI view, and Beijing just handed it the purest one available with a deliberately modest float. Read the debut as policy succeeding, not as price discovery: China set out to build a national memory champion and now has one capitalized at half a trillion dollars. But the containment worked too — that is why the company is worth so much domestically and can still only buy the second-best machines. Both things are true, and the gap between them is the entire investment case.
What to watch
- Where it settles. Opening prints on the STAR Market are set by a thin float and a queue. The number that means something is the one four weeks from now, after lockups and index inclusion get argued out.
- 2027 DRAM contract prices. If CXMT adds real capacity into an already tight market, it changes the shortage math for everyone. If it can’t, the shortage gets worse and Western memory keeps its pricing power.
- Whether Western memory reprices. Micron is committing $250 billion to US memory and SK hynix raised $26.5 billion on the same shortage thesis. A credible new supplier is the one thing that thesis did not assume.
- The equipment list. Any loosening or tightening of export controls on advanced tools moves this stock more than any earnings report will.
Export controls were meant to keep a company like this small. Instead they made it strategically indispensable, and Monday the domestic market priced it accordingly. Containment and valuation are not opposites here. One caused the other.