CXMT surges 466% in Shanghai debut, sparking global memory stock selloff

Chinese memory chipmaker CXMT Corp surged more than 460% in its Shanghai debut on Monday, catapulting to the top of China's stock market by valuation — but the blockbuster listing sent shockwaves through global memory stocks, with SanDisk ↘ 3.73% plunging over 12%, SK Hynix ADRs falling sharply, and Micron ↘ 2.22% and Western Digital ↗ 1.96% sliding in tandem.

CXMT's Record Debut

CXMT, formally ChangXin Memory Technologies, opened at 49.50 yuan on the Shanghai STAR Market, roughly 472% above its IPO price of 8.66 yuan, giving the company a market capitalization of approximately 3.3 trillion yuan ($487 billion). The Hefei-based DRAM maker raised 57.92 billion yuan ($8.6 billion) in Asia's largest IPO of 2026, with proceeds earmarked for expanding production capacity and funding research.reuters+3

The listing instantly made CXMT China's most valuable listed firm, surpassing Industrial and Commercial Bank of China, according to Investing.com.investing

Global Memory Names Under Pressure

The debut renewed investor fears that Beijing-backed memory manufacturers could erode the pricing power of incumbent DRAM and NAND makers. SanDisk was Monday's worst-performing stock in the Russell 1000, tumbling about 12% and extending its decline to more than 45% from its June record high, according to Benzinga. The sell-off followed Friday's 10.8% drop as investors grew increasingly concerned about Chinese competition in the NAND market.benzinga

SK Hynix ADRs, which began trading on the Nasdaq ↗ 0.99% on July 10 at $170 per share and closed their first day at $168.01, have now fallen well below their $149 IPO price. According to Investing.com data, the ADRs closed Friday at $143.02, having traded as low as $139.01 during the session. The decline marks a stark reversal for what was the largest first-time U.S. share sale by a foreign company, which raised $26.5 billion just weeks ago.reuters+2

Monday's rout also dragged Micron and Western Digital lower, extending a punishing stretch for the sector. Memory stocks had already shed ground in recent weeks — SanDisk and Micron are down roughly 45% and 27% respectively from record highs hit last month, according to Investopedia, even as both remain up several hundred percent year-to-date.investopedia

Broader Context

The selloff caps a volatile period for memory stocks that have been the face of the AI rally through much of 2026. The Philadelphia Semiconductor Index PHLX Semiconductor Index ↘ 1.19% fell about 8.5% in the week ending July 18, its sharpest weekly decline since tariff-driven selling in April 2025, according to Morningstar. Morgan Stanley analysts had argued on July 21 that the pullback created "a strong entry point" to memory names benefiting from chip shortages "that show no signs of abating" — but CXMT's massive debut appears to have overwhelmed that optimism, at least for now.global.morningstar+1

The global DRAM market remains dominated by Samsung Electronics, SK Hynix, and Micron, but CXMT's arrival as a publicly traded company with nearly half a trillion dollars in market value underscores just how quickly China's memory ambitions have scaled.reuters+1