SHANGHAI — Shares of CXMT Corp climbed 6.19% to close at 53.52 yuan on Wednesday, adding 3.12 yuan, as investors responded to reports that the Chinese memory chipmaker had pushed yields on its 17-nanometer-class DDR5 products above 90% and that major technology companies continued testing or adopting its chips amid a persistent global shortage of dynamic random-access memory.

Trading volume remained elevated on the Shanghai Stock Exchange's STAR Market, where CXMT, formerly known as ChangXin Memory Technologies, has been one of the most closely watched stocks since its blockbuster debut in late July. The move lifted the company's market capitalization to roughly 3.4 trillion yuan, reinforcing its position among the most valuable listed firms on China's mainland exchanges.

Chinese technology outlet MyDrivers reported that CXMT's DDR5 manufacturing yield had surpassed 90%, a level said to sit only a few percentage points behind comparable Samsung Electronics products of a similar generation. The report, which has not been independently verified by major international outlets, linked the improvement to better overall supply conditions. Higher yields typically allow producers to ship more usable chips from each wafer, an important factor when industry capacity remains tight.

At the same time, reports indicated that Apple has been testing CXMT memory chips for products including iPhones and MacBooks. Laptop makers HP and Acer have already begun using limited volumes of CXMT DRAM in devices sold outside the United States, primarily in mainland China and some emerging markets, according to multiple media accounts citing industry sources. ASUS has also incorporated the chips selectively, while Dell has reportedly maintained a ban. Adoption volumes remain modest, and CXMT's output for the year is largely committed to existing customers.

The developments come less than........

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