China's homegrown DRAM champion raised $8.6B in Asia's largest semiconductor IPO ever, then surged 466% on its Shanghai debut — becoming China's most valuable listed company at $488B. The message to Western memory investors was clear, and the selloff was immediate.
CXMT (ChangXin Memory Technologies, ticker 688825.SH) is China's answer to Micron and SK Hynix. Backed by the PRC government through the National Integrated Circuit Investment Fund (Big Fund) and headquartered in Hefei, Anhui, it is the world's fourth-largest DRAM producer with a 7.67% global market share in 2025.
On July 27–28, CXMT completed Asia's largest semiconductor IPO in history — raising ¥57.92B ($8.6B) and debuting on the Shanghai STAR Market. The stock opened at 8.66 yuan and closed its first session at approximately 49 yuan: a 466% single-day gain that generated ¥141B in trading volume, a record for any A-share stock in a single day.
At $488B market cap, CXMT surpassed ICBC (the world's largest bank by assets) as China's most valuable onshore-listed company. For context: Micron Technology's market cap is ~$110B. CXMT's debut valuation is 4× its primary US competitor on a market-cap basis — an extraordinary signal of domestic investor confidence and government backing.
| Ticker | Company | Move | Reason | |
|---|---|---|---|---|
| 🇨🇳 | CXMT | ChangXin Memory (688825.SH) | +466% | Shanghai IPO debut — Asia's largest semiconductor offering ($8.6B raised); market cap $488B on day one |
| 🇺🇸 | SNDK | SanDisk | −14.25% | 2nd straight crash: −11.02% Mon Jul 27, −14.25% Tue Jul 28; 2-day loss −23.7% from Friday close of $1,436.56 |
| 🇰🇷 | 000660.KS | SK Hynix | −14.65% | World's #2 DRAM producer; CXMT attacks its core market with government-backed scale |
| 🇰🇷 | 005930.KS | Samsung Electronics | −13.39% | Largest global DRAM and NAND producer; highest absolute revenue exposure to Chinese memory competition |
| 🇺🇸 | MU | Micron Technology | −8.85% | DRAM direct competitor; Apple reportedly testing CXMT chips for China devices undercuts MU's customer base |
| 🇺🇸 | MRVL | Marvell Technology | −7.77% | Storage controller chips face indirect risk from Chinese memory ecosystem; semi sector risk-off |
| 🇺🇸 | LRCX | Lam Research | −7.55% | Memory etch equipment demand at risk; CXMT self-sufficiency reduces long-term Western equipment dependency |
| 🇳🇱 | ASML | ASML | −4.37% | 2-day drop (−5.79% Mon, −4.37% Tue); The Information: Chinese firm mass-producing chipmaking equipment |
| 🇺🇸 | MPWR | Monolithic Power Systems | −4.26% | AI power management pulled lower in broad semiconductor risk-off; no direct memory exposure |
| 🇹🇼 | TSM | TSMC | −1.70% | Muted reaction — TSMC manufactures for CXMT too; limited direct competitive overlap with memory |
CXMT's 466% debut is not just a Chinese stock market event — it is a signal about the trajectory of the global memory market. Three specific fears drove today's Western selloff:
The most alarming headline of the day: Apple is reportedly testing CXMT-produced DRAM chips for iPhones and iPads sold in China. Apple has historically sourced memory from Micron, Samsung, and SK Hynix. A switch to CXMT in China would directly cost Micron its single largest DRAM customer relationship in the region.
A $488B market cap and government backing means CXMT can price aggressively, invest in capacity, and absorb losses in ways that pure-commercial players cannot. Micron at ~$110B market cap has 4× less capital market firepower than its new competitor. This is an asymmetric competition with a state-backed adversary.
CXMT is a DRAM company; SanDisk (SNDK) makes NAND flash. Investors fear that China's success in DRAM — using exactly the Big Fund + domestic procurement playbook — will be replicated in NAND. YMTC (Yangtze Memory Technologies) already has NAND production capacity, and a CXMT-style IPO for YMTC cannot be ruled out.
Semiconductor stocks had already fallen 20%+ from their 2026 highs before today, amid concerns about AI spending sustainability and hyperscaler capex peaking. CXMT's debut landed on a sector already primed for further selling. The combination of structural fear (China competition) and technical weakness (bear market momentum) amplified the move.
SanDisk suffered a two-day collapse: −11.02% on Monday July 27 (closing at $1,278.23) then another −14.25% today closing at $1,096.10 — a combined −23.7% from Friday's close of $1,436.56. It was the worst performer in the Russell 1000 both days. Several factors make SNDK more exposed than Micron:
Micron fell 8.85% today (closing at $820.53 vs yesterday's $900.20) — painful, but less than SK Hynix (−14.65%) and Samsung (−13.39%). That difference matters: Micron's highest-margin exposure is to HBM3E (High Bandwidth Memory for NVIDIA AI accelerators), where CXMT has explicitly said it targets production only by 2027–2028.
Separate from the CXMT IPO, The Information reported today that a Chinese state-backed company has begun mass-producing a key piece of semiconductor manufacturing equipment — believed to be an advanced deep-UV immersion lithography system. ASML fell on the news.
This matters for three reasons:
ASML confirmed it is monitoring the reports but noted that mass production of DUV tools does not replicate High-NA EUV capability. The leading-edge node gap (ASML can do <2nm via EUV; Chinese DUV equivalents are limited to ~28nm at scale) remains substantial.
HBM3E is Micron's crown jewel — CXMT cannot touch it for 2+ years. Today's -5% is sentiment, not a fundamental impairment. The China DRAM risk is real but concentrated in commodity DDR5, not the high-margin AI memory that drives MU's thesis.
An 11% drop after a 574% YTD run is a valuation reset, not a business collapse. The $1,000 level is key. Watch whether AI storage demand data (from hyperscaler earnings) holds up — that's the real thesis test.
TSMC still manufactures Cambricon and CXMT's advanced chips. ASML's EUV monopoly at leading nodes is intact. Both fell on sentiment; neither has a fundamental change to near-term earnings from today's news.
If Apple qualifies CXMT DRAM for China iPhones, that is a concrete revenue event — not a fear. This is the data point to watch in coming weeks. An Apple qualification would confirm the near-term bear case for MU China revenue.
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