CXMT Jumped 470% on Its Shanghai Debut. China's Most Valuable Listed Company Now Makes RAM, Not Loans.

TL;DR

CXMT, China's biggest DRAM maker, listed on Shanghai's STAR Market on Monday and opened at 49.50 yuan against an IPO price of 8.66 yuan, a surge of roughly 470%, per the South China Morning Post and Nikkei Asia. That prices the company at about 3.31 trillion yuan, roughly $489 billion, making it the most valuable company listed on the mainland Chinese market, ahead of state banking giant ICBC. The fuel is the AI memory supercycle; the accelerant is a free float of just 6.73% of shares. For builders, the sharper question is what a fourth serious DRAM maker does to the RAM prices wrecking your homelab budget, and the honest answer is: not enough, not yet.

Day one, in two numbers

The Hefei-based company, listed as Changxin Technology Group, raised 57.92 billion yuan ($8.6 billion) at 8.66 yuan per share, with the raise climbing to 66.61 billion yuan if the over-allotment option is exercised in full, per The Standard. That makes it Asia's biggest IPO this year and, at the full amount, the largest in the STAR Market's history, past the 53.2 billion yuan foundry SMIC raised in 2020.

The resulting market cap does not just top every company listed in China. Nikkei notes it now exceeds Intel's. The previous domestic titleholder, ICBC, spent years accumulating the world's largest banking balance sheet; CXMT overtook it in a morning by selling memory chips into a shortage.

Why the market is this thirsty

The demand story is real even if the multiple is not. In its pre-IPO disclosures, CXMT reported first-quarter revenue up 719% year on year, swinging from a 2.83 billion yuan loss a year earlier to a net profit SCMP puts at 33 billion yuan. The AI buildout is devouring DRAM: every accelerator node ships with a mountain of DDR5 beside it, and CXMT says it now prices within 5 to 10% of the incumbents. It has started shipping DDR5 server memory to Tencent and ByteDance after completing their validation, per the same reporting.

Per its IPO prospectus, CXMT captured about 7.7% of global DRAM revenue in 2025, making it the fourth-largest supplier, and the first new entrant to crack that tier in decades. The three companies above it, Samsung, SK hynix, and Micron, still control over 90% of the market between them.

The float is doing the heavy lifting

Now the part the champagne headlines skip. Only 6.73% of CXMT's enlarged share capital was freely tradable at listing, per The Standard; the rest is locked up. Monday's price was discovered on that sliver, by retail investors who oversubscribed the deal by orders of magnitude, in a market that has been front-running the memory supercycle for months. It is like appraising an entire apartment building off the one unit that sold this morning, during a bidding war, to a buyer who camped outside overnight. The appraisal is arithmetically correct and economically fiction.

For calibration: at 8.66 yuan, the IPO itself valued CXMT at roughly $85 billion. The gap between that number and $489 billion is what one morning of scarcity and sentiment added. When lockups expire and the float widens, some of it will be handed back.

The letters missing from the prospectus: HBM

Here is the detail that matters most for AI and got the least airtime. Per DigiTimes, the IPO's funding list leaves high-bandwidth memory off entirely: the proceeds go to commodity DRAM capacity and technology, not an aggressive HBM push. SemiAnalysis estimates only about 5 of CXMT's roughly 265 thousand wafer starts per month were allocated to HBM at the end of 2025, and pegs its HBM3 8-high yields around 25%, low enough that every HBM wafer currently loses money against the commodity DRAM it displaces.

So China's most valuable listed company is an AI-boom stock that does not yet competitively make the one memory type AI accelerators are actually bottlenecked on. The valuation says HBM champion; the prospectus says DDR5 factory. Both cannot be right at these prices.

What it means for your RAM bill

The question that matters for anyone speccing a homelab inference box or a fleet of servers: does a fourth DRAM maker at scale finally break the shortage that has DDR5 prices at record highs? SemiAnalysis projects CXMT reaching about 350 thousand wafer starts per month by the end of 2026, near Micron's capacity, and 500 thousand by the end of 2028, roughly 17% of global DRAM supply. Its bit-shipment share rises from about 9% in 2025 to a projected 12% in 2027.

And yet SemiAnalysis still projects the DRAM market undersupplied by a high-single-digit percentage this year, widening to low-to-mid-teens bit undersupply next year. AI demand is growing faster than the newcomer can fab. Cheap DDR5 is not coming back because CXMT went public; if anything, the IPO confirms how durable the sellers' market looks from inside it.

There is a geographic wrinkle, too. CXMT's customer list, Alibaba Cloud, Lenovo, Xiaomi, Oppo, Vivo, Honor, is overwhelmingly domestic, and US export politics keep it that way. SCMP reports Apple has been lobbying Washington for clearance to buy CXMT memory. Until that changes, China's most valuable listed company makes a product most of the West cannot put in a server, which is its own kind of milestone.

The caveats, straight

• The 470% figure varies slightly by outlet and moment: SCMP counted 472% intraday, Nikkei 471%. All agree on the order of magnitude and the sub-7% float behind it.
• The $489 billion market cap is a day-one, thin-float number. Lockup expiries and wider trading will test it.
• The Q1 profit swing is drawn from CXMT's own pre-IPO disclosures as reported by SCMP; memory is a brutally cyclical business and 2026 margins are peak-cycle margins.
• SemiAnalysis's capacity and yield figures are third-party estimates, not company guidance.

Key Takeaways

• CXMT opened its STAR Market debut at 49.50 yuan against an 8.66 yuan IPO price, up roughly 470%, reaching a 3.31 trillion yuan (~$489 billion) market cap, the largest of any China-listed company and, per Nikkei, above Intel's.
• The 57.92 billion yuan ($8.6 billion) raise is Asia's biggest IPO of 2026 and, with the over-allotment, a STAR Market record ahead of SMIC's 2020 listing.
• The fundamentals are real (Q1 revenue up 719% year on year, 7.7% of global DRAM revenue in 2025, DDR5 shipping to Tencent and ByteDance), but the pop was engineered by a 6.73% free float.
• The IPO funds commodity DRAM, not HBM: CXMT's HBM allocation is tiny and its HBM3 yields are estimated around 25%, so the AI-critical memory tier stays a three-company market for now.
• Even with CXMT doubling capacity by 2028, SemiAnalysis projects DRAM undersupply widening into 2027. Do not wait for this IPO to make your RAM cheaper.

Sources: South China Morning Post, Nikkei Asia, CNBC, The Standard, SCMP IPO preview, Reuters (via US News), Bloomberg, DigiTimes, SemiAnalysis