CXMT Closes Up 466% in Shanghai Debut With No HBM Project in Its Prospectus

ChangXin Technology Group closed 465.82% above its issue price in its Shanghai trading debut Monday, the Shanghai Stock Exchange's first-day record shows, making the memory chipmaker the most valuable company listed on a mainland Chinese exchange. The offering behind the debut raised 57.92 billion yuan, about $8.6 billion, the largest mainland semiconductor share sale on record. CXMT's prospectus assigns its named projects to conventional DRAM wafer lines and process upgrades, and SemiAnalysis said the document discloses no dedicated high-bandwidth memory project.

The 49-yuan close

The exchange's tape put CXMT, code 688825, at 49 yuan at the close. The shares had sold at 8.66 yuan and traded between 38.11 yuan and 55.03 yuan during the session. At that price the Associated Press put the market value at about 3.3 trillion yuan, more than $487 billion, ahead of Industrial and Commercial Bank of China. STAR Market rules impose no price limit on a new listing during its first five trading days.

The exchange recorded 141.19 billion yuan in first-day turnover, with 66.4% of the free float changing hands.

The retail tranche of the offering was 212 times oversubscribed, with individual investors submitting 9.4 million orders for 7.07 trillion yuan of shares, Bloomberg reported. Listing documents showed only 6.73% of CXMT's enlarged share capital was freely tradable, because most shares were locked up.

The prospectus's 29.5 billion yuan

CXMT said it would deploy 29.5 billion yuan across three named projects. Nearly 70%, or 20.5 billion yuan, goes to wafer lines and upgrades to DRAM processes already in operation. The remainder supports what the company calls forward-looking DRAM research. SemiAnalysis wrote that the prospectus "discloses no dedicated HBM project and does not mention HBM."

CXMT has been developing HBM-related capabilities, TechNode reported, and commercial production would require further advances in stacking, packaging, testing and customer validation. What the filing does not carry is IPO money behind a near-term expansion. The listing "primarily strengthens CXMT's core DRAM manufacturing and technology base, with no disclosed funding commitment to a near-term HBM expansion," the research firm wrote.

The base offering was nearly twice the sum assigned to those three projects. CXMT said the balance would support working capital without specifying an allocation. Proceeds could rise to 66.61 billion yuan if the over-allotment is exercised.

SemiAnalysis's 85,000-wafer estimate

CXMT ranks fourth among DRAM producers worldwide. Counterpoint Research put its 2025 shipment share at roughly 8%, against 36% for Samsung, 29% for SK Hynix and about 24% for Micron.

"The industry-wide supply-demand imbalance should persist through 2027 and likely into 2028," Ray Wang, who leads memory coverage at SemiAnalysis, told The Korea Herald. He attributed the shortage to wafer capacity shifting toward HBM, which slows overall DRAM bit growth. Each gigabyte of HBM consumes about three times the wafer area of ordinary DRAM. The firm expects CXMT to add 85,000 wafers a month this year. Its estimates for the three leaders are 15,000 at Samsung, 60,000 at SK hynix and 30,000 at Micron. UBS measured a nearly 95% quarter-on-quarter rise in DRAM contract prices in early 2026.

DigiTimes cited supply-chain sources saying CXMT's output is booked through the end of 2027, with Dell, HP, Lenovo and Apple first in line. Reuters reported that its DDR5 sells at parity with the three leaders and recently cost more than Samsung's comparable server modules. "As of today, CXMT's technology still lags that of the leading memory suppliers," Wang said. "However, in an extremely supply-constrained environment, CXMT's output has become increasingly valuable as customers seek to secure as much DRAM allocation as possible."

Wu Zhou exits at the open

Wu Zhou, a fund manager at Shenzhen Deyuan Investment, bought IPO shares and sold all of them when trading began. "At such a price, I don't dare to hold, or buy the stock," he said. Yuan Yuwei of Trinity Synergy Investments called the stock "too expensive" and said it "smells of speculation."

SemiAnalysis estimates CXMT's cost per bit on DDR5 runs more than 30% above the three leaders, and models its HBM3 8-high yield at about 25%. Morningstar's Jing Jie Yu wrote that CXMT's lack of access to the most advanced chipmaking equipment is "a significant technological barrier to the progression of commercial and economically sound technologies."

"Trade restrictions on tools are remaining as the key challenge for CXMT," said MS Hwang, a research director covering memory semiconductors at Counterpoint. The company carries a Pentagon designation as a Chinese Military Company, and a U.S. interagency committee has approved adding it to the Commerce Department entity list, a step that has not been implemented. CXMT may become eligible for Stock Connect at the third-quarter review in late August, with inclusion taking effect in mid-September at the earliest, according to Bloomberg.

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Marcus Schuler

San Francisco

Editor-in-Chief and founder of Implicator.ai. Former ARD correspondent and senior broadcast journalist with 10+ years covering tech. Writes daily briefings on policy and market developments. Based in San Francisco. E-mail: editor@implicator.ai