Picture a company that opens for trading and, before the lunch bell, is worth almost six times what the sharpest institutions agreed it was worth the previous Friday. That is what happened in Shanghai on Monday, 27 July.
ChangXin Memory Technologies, mercifully shortened to CXMT, makes DRAM. That is the fast, forgetful memory that sits beside every processor and holds whatever your phone or laptop is doing this exact second. Boring, essential, and until now dominated by three foreign giants. Shares priced at 8.66 yuan. They opened near 49. That is a jump of roughly 470 per cent on day one.
The numbers, before they get away from us
The listing on Shanghai’s tech-focused STAR Market raised about 57.92 billion yuan (around 8.6 billion dollars), the biggest mainland flotation since Agricultural Bank of China went public in 2010. The opening pop pushed CXMT’s market value to roughly 3.3 trillion yuan (about 480 billion dollars), enough to shove aside ICBC, a giant state bank, as the most valuable company listed in mainland China. A memory-chip maker is now, on paper, worth more than the banks.
CXMT is the world’s fourth-largest DRAM producer, with about 7.67 per cent of the global market as of late 2025. The other 90-odd per cent belongs to Samsung, SK Hynix and Micron, a cosy three-way that has set memory prices for the best part of a decade.
Who actually paid for this
This was not a bet on profits. It was a patriotic queue. Beijing wants to make its own memory rather than buy it from Korean and American firms it no longer trusts, and CXMT is the flagship of that programme. Domestic retail investors piled in, bidding the price to a level no cautious analyst would defend on fundamentals. The strategic goal is the state’s. The valuation risk, now that the shares trade at nosebleed multiples, sits with the households who chased them.
None of which means the chips are bad. CXMT genuinely closed a technology gap that Washington’s export controls were meant to keep prised open. But a 470 per cent first-day gain is a mood, not a measurement. When the mood cools, and first-day moonshots usually do, the people left marking their portfolios to reality tend not to be the ones who structured the deal.
The bigger board
Step back and the debut is really about supply. Memory has been in a brutal shortage as AI data centres hoover up every high-bandwidth chip going, and prices have climbed all year. A credible fourth supplier changes the maths for everyone, from Nvidia’s server builders to the three incumbents who have enjoyed the squeeze. That is the real story under the fireworks: not one day’s share price, but whether the memory oligopoly just gained a fourth member with a government behind it.
None of this is investment advice. It is a news story about a very large number.
Did you know: the Agricultural Bank of China listing that CXMT just beat had held the mainland record for over fifteen years before a memory-chip firm walked in and took it.