ChangXin Memory Technologies (CXMT), a Chinese manufacturer of dynamic random-access memory (DRAM) chips, experienced a dramatic surge in its stock price following its debut on the Shanghai Stock Exchange. On its first trading day, the company’s shares closed approximately 466% higher than the initial public offering (IPO) price, giving CXMT a market valuation of about 3.28 trillion yuan (roughly HK$3.8 trillion or £365 billion) and making it the most valuable mainland-listed company.
The Hefei-based chipmaker’s shares opened at 49.50 yuan, compared with the IPO price of 8.66 yuan. During the session, the stock reached a peak of 55.03 yuan before settling near 49.00 yuan at close. Turnover in the company’s shares exceeded 140 billion yuan, surpassing the 100 billion yuan single-day trading volume milestone for the first time in mainland China’s market history.
The company raised an estimated 57.9 billion yuan in the offering, a sum larger than the 53.2 billion yuan raised by Semiconductor Manufacturing International Corporation (SMIC) during its 2020 IPO. Prominent strategic investors such as Alibaba Cloud and electric vehicle maker Nio secured stakes in the offering, with Alibaba-related entities already holding just under 5% pre-IPO.
CXMT is China’s leading DRAM supplier, accounting for approximately 7.7% of global DRAM revenue in the last quarter of 2025, ranking it as the world’s fourth-largest memory chipmaker behind South Korean companies Samsung Electronics and SK Hynix, and US-based Micron Technology. The company operates three factories—two in Hefei and one in Beijing—with a fourth facility under construction in Shanghai. Major Chinese technology firms such as ByteDance and Huawei are among its customers.
The strong market debut occurred against a backdrop of rising global demand for memory chips, spurred in part by expanding artificial intelligence (AI) applications and data center infrastructure. This heightened demand has contributed to supply constraints, as leading chip producers have shifted focus toward advanced processors tailored to AI clients, reducing production of conventional DRAM chips used in smartphones and consumer electronics.
The rapid price increase and the scale of CXMT’s IPO have raised concerns among regulators and market participants regarding potential impacts on liquidity and market stability. The China Securities Regulatory Commission (CSRC) convened meetings with key stakeholders to address these worries and pledged to enhance mechanisms aimed at stabilizing the market. Analysts from securities firms acknowledged the possibility that CXMT’s large market value might temporarily draw investment funds away from other technology stocks but also noted that such pressures typically dissipate after the initial trading period.
Investor enthusiasm was particularly pronounced, with online subscriptions for CXMT shares oversubscribed by 244 times, prompting reallocation of shares from institutional to retail investors. Despite recent sell-offs in AI-related stocks triggered by concerns over emerging Chinese open-source AI models such as Moonshot’s Kimi K3, investor confidence in CXMT remained robust. This dynamic reflects sustained strategic interest in China’s semiconductor industry, which is a key element of Beijing’s “Made in China” initiative aimed at boosting domestic high-tech capabilities amid restrictions on access to advanced foreign technology.