Global semiconductor shares tumbled on October 13, 2026, after Broadcom CEO Hock Tan warned that AI investors resemble casino gamblers with unrealistic expectations. The rout intensified as Chinese memory chipmaker CXMT announced technical advances in high-density RAM chips, threatening market leaders. South Korea's Kospi index fell up to 7% as Samsung Electronics and SK Hynix plunged, erasing billions in market value and billionaire net wealth.
Global semiconductor stock selloff
- ▪Global semiconductor stocks declined sharply in Asia and U.S. premarket trading on October 13, 2026, triggered by advances from Chinese chipmaker CXMT and Broadcom CEO Hock Tan's warnings about AI investing
- ▪U.S. chipmakers Micron, Nvidia, AMD, Intel, and Broadcom experienced premarket share declines on October 13, 2026, following losses on October 12, 2026
- ▪Japanese flash memory manufacturer Kioxia Holdings Corp. shares dropped over 12% on October 13, 2026, while SoftBank Group shares fell 8.5%
- ▪In South Korea, Samsung Electronics shares dropped between 7.4% and 8.8%, and SK Hynix fell between 9.4% and 10.1% on October 13, 2026
- ▪Taiwan Semiconductor Manufacturing Co. (TSMC) shares dropped nearly 2% on October 13, 2026, as Taiwan's benchmark Taiex index fell as much as 2.5%
Broadcom CEO AI investor warnings
- ▪Broadcom CEO Hock Tan stated at a Singapore event on October 12, 2026, that artificial intelligence investors are acting like casino gamblers who lack technical understanding and set unrealistic expectations
- ▪Broadcom CEO Hock Tan criticized corporate spending on artificial intelligence initiatives and questioned the long-term financial viability of loss-making artificial intelligence laboratories
Chinese chipmaker CXMT memory advances
- ▪Research firm TrendForce indicated that Chinese chipmaker CXMT's new RAM design could increase memory density by 30% to 50% within the same physical chip surface area
- ▪Chinese memory chipmaker CXMT announced on October 12, 2026, progress on a new high-density RAM chip architecture designed to challenge rivals Samsung Electronics, SK Hynix, and Micron
- ▪Elon Musk posted on October 12, 2026, that China's capacity to scale manufacturing exceeds the rest of the world combined once China determines how to manufacture a product
Capital constraints in AI development
- ▪Broadcom CEO Hock Tan stated on October 12, 2026, that frontier laboratories Anthropic and OpenAI have demonstrated significant revenue generation from artificial intelligence personal assistant models
- ▪Broadcom CEO Hock Tan stated on October 12, 2026, that capital availability will be Broadcom's primary constraint during artificial intelligence expansion, rather than memory or wafer supply shortages
South Korean market performance
- ▪South Korea's Kospi index was the world's worst-performing stock market in the third quarter of 2026, after more than tripling from early 2025 to its mid-July 2026 peak
- ▪Samsung Electronics and SK Hynix lost almost 15% of their stock market valuation over the five trading days preceding October 13, 2026
- ▪South Korea's benchmark Kospi index fell as much as 7% on October 13, 2026, dragged down by Samsung Electronics and SK Hynix, which represent nearly half of the index weight
Billionaire wealth impact
- ▪Samsung executive chair Jay Y. Lee's net worth declined by $2.8 billion to $29.4 billion on October 13, 2026, while he maintained his position as South Korea's richest person
- ▪The semiconductor selloff on October 13, 2026, reduced SoftBank founder Masayoshi Son's estimated net worth by $5.5 billion to $64.3 billion, according to Forbes estimates
Debatable claims
- ▪Chinese memory chip advances pose a fundamental threat to established global semiconductor manufacturers
- ▪Current market valuations for artificial intelligence chipmakers reflect speculative gambling rather than economic fundamentals
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