Shares in the world’s leading memory chipmakers fell for a second straight session on Tuesday, after a little-known Chinese rival said it is moving into one of the industry’s most lucrative segments.
ChangXin Memory Technologies, known as CXMT, announced over the weekend that it had made progress on a new chip architecture that packs more data into a smaller area. At a chip conference in Shanghai, its president said a denser server memory product would launch by the end of the year.
The announcement unsettled investors who had assumed the sector’s top three producers were largely safe from competition.
A selloff across continents
The reaction started in Asia. Shares in South Korea’s SK Hynix and Samsung Electronics have lost roughly 13% to 15% since Monday’s open, according to Morningstar. South Korea’s main stock index sank by more than 6% on Tuesday by some market reports, and Japan’s Nikkei fell nearly 3%.
The slide spread to the US. Micron Technology fell between roughly 4% and 5% in Tuesday trading, while SanDisk, Seagate and Western Digital also dropped. In Europe, equipment maker ASML and other chip stocks slipped.
Why server memory matters
Memory chips are components that store data, and the type used in servers is central to the construction of AI data centres. It is also the segment that has produced the industry’s fattest profit margins.
A denser design lets a manufacturer fit more capacity onto each chip, which is the main economic lever in the business. A credible new supplier could therefore push down prices across the whole high-end market, a risk investors have rushed to price in.
From obscure to a market force
CXMT was little known outside China until its recent listing on Shanghai’s technology-focused STAR Market. Its shares have slipped about 4% from their first-day price of 49 yuan, but the company is still valued at roughly 3.46 trillion yuan, or about $520 billion. That is not far behind the technology group Tencent.
Market reports suggest CXMT’s share of the global DRAM market is climbing towards 10%. One open question after the listing was whether it could close the technology gap with Micron, Samsung and SK Hynix, particularly in high-bandwidth memory, a key component in advanced AI systems.
Fears about AI spending add fuel
The CXMT news arrived on a market already on edge. Hock Tan, chief executive of Broadcom, had recently compared investing in artificial intelligence to a casino, a remark that rippled through Asian trading.
Analysts said the timing amplified the damage. Vey-Sern Ling, a senior equity adviser at UBP, said investors were looking for reasons to take profits on AI-linked shares that had performed strongly this year, memory stocks in particular. He also pointed out that Chinese memory makers still face technology hurdles in the short run, especially in advanced products such as high-bandwidth memory.
Elon Musk added to the debate on social media, arguing that when China learns to build a product, its ability to scale often exceeds that of the rest of the world combined.
What happens next
Memory makers have had a strong run. Micron reported record results for its latest fiscal quarter at the end of September, and it forecast an even stronger current quarter, driven by demand from AI data centres.
That strength makes the question facing investors more pointed. Is the selloff an overreaction by crowded trades, or an early signal that pricing power is eroding?
The answer will depend on whether CXMT delivers on its year-end launch, how quickly it can ramp production, and whether demand from cloud providers stays strong. For now, the incumbents’ shares reflect a sudden loss of confidence rather than any change in their earnings.
