ChangXin Memory Technologies (CXMT), China's dominant DRAM manufacturer, saw its shares climb 12 per cent on Monday, 17 August 2026, closing at a record 61.80 yuan (US$9.16) and pushing its market capitalisation to 4.13 trillion yuan — cementing its position as China's most valuable listed company. The Hefei-based chipmaker's ascent reflects a broader global memory sector rally fuelled by surging artificial intelligence (AI) infrastructure demand.

From IPO to record: A historic market debut

CXMT made its trading debut on July 27 on mainland exchanges, with shares surging 466 per cent on the first day — one of the most dramatic listings in recent Chinese market history. Monday's close placed the stock more than seven times above its initial public offering price of 8.66 yuan. The company had already overtaken Hong Kong-listed Tencent Holdings the previous Thursday, when its market value reached approximately 3.54 trillion yuan.

Why it matters: SanDisk and the AI memory upcycle

The latest leg of CXMT's rally was largely sector-driven. Shares of SanDisk surged nearly 30 per cent across Thursday and Friday after its investor day reinforced expectations that AI demand could keep memory supplies tight for an extended period. Micron Technology also gained 6.7 per cent last Friday, adding further momentum to the global memory trade.

SanDisk had reported strong quarterly results earlier in August 2026 and, at its investor day, forecast solid long-term growth and margins. The NAND maker projected that solid-state drive (SSD) shipments for AI data centres could reach 1,200 exabytes by 2030 — equivalent to 1.2 billion terabytes — according to research firm Nomura, which said the event provided greater long-term visibility into the NAND market.

The competitive backdrop: Memory goes 'memory-centric'

Wall Street research firm Bernstein said SanDisk's investor day presentation made it more bullish on the stock, arguing that AI is shifting from a 'compute-centric' to a more 'memory-centric' architecture as larger models and longer context windows raise memory requirements. Bernstein also noted that SanDisk's planned high-bandwidth flash technology could consume substantially more wafer capacity than conventional NAND, potentially keeping supplies tight for longer.

Global memory peers including Samsung Electronics, SK Hynix, and Micron Technology are all navigating the same structural shift, but CXMT's domestic positioning gives it a distinct advantage as China's government continues to prioritise semiconductor self-sufficiency.

What's next for CXMT and China's chip sector

With CXMT's valuation now exceeding that of Tencent — long the benchmark for China's most valuable companies — investor attention will turn to whether the chipmaker can translate market enthusiasm into sustained earnings growth. The trajectory of AI data centre buildouts globally, and the pace at which CXMT can scale advanced DRAM production, will be the key variables to watch heading into the second half of 2026.