China's CXMT Popped 466% on Its Debut; Memory Stocks Fell
Monday, August 310 Min Read
China's largest memory chipmaker began trading in Shanghai on July 27 in a record IPO and closed its first session up 466%. Seven days later came word that it was negotiating a second plant in Beijing, and the entire memory shelf, from Micron to Seagate, sold off.
466%
CXMT's First-day Gain in Shanghai
$8.6B
Raised in the IPO
600,000
Targeted Monthly Wafer Capacity
39%
Micron's Drawdown From Its 2026 High
In This Piece6 Sections
China's Most Valuable Company in a Single Session
On July 27, ChangXin Memory Technologies — CXMT — opened on Shanghai's STAR Market at 8.66 yuan a share. It cleared 54 yuan intraday and closed worth 3.66 trillion yuan, close to $500 billion — China's most valuable listed company. The offering raised 57.92 billion yuan, roughly $8.6 billion, the second-largest mainland IPO since Agricultural Bank of China in 2010.
Seven days later Reuters reported talks over a second memory fab in Beijing. Within the hour Micron fell 4% in the premarket to $790.50, with Seagate and Western Digital shedding more than 7%. Memory is a commodity, and in commodities the price is set by whichever producer is most willing to sell.
From Hefei to Shanghai: Ten Years of a State Project
CXMT was founded in Hefei in 2016 as Innotron and made 20,000 wafers a month in 2019. Today three 12-inch fabs run at roughly 100,000 wafers a month each; once the Shanghai and Hefei projects come online the target exceeds 600,000.
Its five largest holders are Qinghui Jidian (21.67%), ChangXin Integrated (11.71%) and the second phase of the China Integrated Circuit Industry Investment Fund (8.73%). Hefei Jixin (8.37%) and Anhui Investment (7.91%) complete the list.
There is no controlling shareholder, but the weight sits with local governments and state funds.
The constraints are as clear. Since 2022 it has been barred from US federal procurement, and in June 2026 it joined the Pentagon's military-ties list. It cannot buy the most advanced equipment, and it burns roughly 30% more wafers than rivals for the same output.
Even so its global DRAM share climbed from 3% in the first quarter of 2025 to 8% a year later, making it the world's fourth-largest maker. The three ahead — Samsung, SK Hynix and Micron — held close to 90% between them, per Counterpoint.
The Arithmetic of the Marginal Unit: Why 10% Excess Supply Cuts Prices 50%
The spot price of a DDR5 chip was $6.84 in September 2025 and $27.20 by December, with Counterpoint putting the first-quarter 2026 rise at 80% to 90%. AI data centers did buy enormous amounts of memory — but demand did not rise 300%.
Why doesn't a producer cut output when it sees a surplus? Most of the cost is already paid.
A unit selling for 100 carries 45 of cash cost and 30 of depreciation, for 25 of profit. A 30% price fall leaves revenue at 70 against 75 of cost, a loss of 5 units. Idle the fab and sales go to zero while depreciation still runs, for a loss of 30 instead.
Producing at a loss beats not producing. Everyone runs that calculation, so memory downturns are deep and long.
July: The Month the Market Remembered the Arithmetic
The information is in the distribution, not the size: the Nasdaq finished July down 3% while memory names lost between a third and a half. For semiconductors it was the worst month since 2008, and Micron closed at $823 on July 31, 39% below its high for the year.
July 27 - August 3
- July 27CXMT begins trading on Shanghai's STAR Market at 8.66 yuan; the intraday gain tops 466%. Market value: 3.66 trillion yuan.
- July 28Memory selling deepens: SanDisk halves from its high, Western Digital sits 42% below; South Korea's Kospi is down roughly 29% in a month.
- July 30Situational Awareness, whose core positions sit in memory and AI infrastructure, changes hands in one block trade. Details.
- July 31The Nasdaq ends the month down 3%; semiconductors post their worst month since 2008. Micron at $823.
- August 3Reuters: CXMT is in talks over a second DRAM fab in Beijing's Yizhuang. Micron slips to $790.50 in the premarket.
That last item has limits. Reuters reports early-stage talks, with the company seeking at least 60 million yuan (about $8.9 million) from the district government. That is tiny next to the cost of a DRAM fab.
It is a statement of intent, not a capacity commitment.
The Other Side: Two Readings of the Same News
| Issue | Bull Case | Bear Case |
|---|---|---|
| CXMT's strength | Equipment restrictions force it to burn 30% more wafers; its costs are high | Market share went from 3% to 8% in a year, and capacity is doubling |
| Capital | $8.6 billion is modest for a single fab cycle | A state-funded producer can keep making chips for years without turning a profit |
| Product | Absent in HBM; the profitable end of AI memory belongs to Micron | As Micron and Samsung retreat from legacy DRAM, CXMT fills the gap |
| Demand | The supply deficit is expected to persist through 2028 | Samsung's and SK Hynix's capacity plans are being discussed in the $575B to $1.3T range |
| Valuation | Micron's forward P/E of 19.8 is not historically expensive | For a commodity producer, a low P/E marks the top of the cycle |
What Is Left
CXMT makes roughly one-twelfth of global DRAM output, does not yet make the high-bandwidth memory AI servers demand, and its technology gap is measured in years. All of that is true. But price is set by the marginal producer, and who that is depends on who endures longest, not who is largest.
What was repriced in July was not Micron's earnings but the assumption that memory prices would stay elevated through 2028. It may still prove correct — but it can now be questioned on the strength of one company's fab plans, which was not the case last winter. That is where volatility comes from: news that changes not the price but the assumption the price rests on.
This article draws on information reported by Reuters, Counterpoint Research, SCMP, TechNode and the company's IPO prospectus. The report of a second plant in Beijing rests on two unnamed sources familiar with the matter cited by Reuters and has not been confirmed by the company. Price and market share figures are as of the date of publication. This is not investment advice.
Correction (September 13, 2026): prose tightened for rhythm; figures and sources unchanged.
Companies in This Piece
Since The Event
MUMicron Technology Inc
SNDKSanDisk Corporation
WDCWestern Digital Corp
STXSeagate Technology Holdings PLC
SKHYSK Hynix Inc
NVDANVIDIA Corp
+1 More Companies