Taiwanese retail investors have piled on borrowing to chase a TSMC-led rally in AI-related stocks, pushing margin debt up 160% over the past 12 months. The level now exceeds what preceded the 2000 dot-com bubble, fueling concern that the market has overheated.
May 2026 · Taiwan Equity Market
Retail Leverage Fuels a TSMC-Led AI Rally — and Bubble Fears
Borrowed money is pouring into AI chip stocks as the TAIEX hits records. Margin debt is nearing levels last seen in September 2000, even as TSMC's earnings stay strong and its CEO warns he is "very nervous."
42%
of the entire TAIEX is TSMC alone — a key source of fragility
+$13B
year-on-year rise in margin debt cited
$4.95T
Taiwan market cap, surpassing India (May 2026)
One stock dominates the index
Share of the TAIEX — TSMC vs. every other listed company combined
The earnings are real — Q1 2026
+35.1%
Revenue YoY — NT$1,134.1B (~US$35.9B)
66.2%
Gross margin (operating 58.1%)
$52–56B
FY2026 CapEx; revenue outlook +30%+ in USD
Bull case
TSMC is the "bottleneck of AI" — a tollbooth on the AI highway. Domestic retail investors view AI demand as structural , not a passing cycle, and argue its near-monopoly means it is not a bubble.
Bear case
Single-stock concentration and excessive leverage. Margin trading magnifies losses on small declines and can trigger cascading selling . Foreign investors stay cautious on geopolitical and bubble risk.
From the top
CEO C.C. Wei: "very nervous" about AI bubble concerns
Investing without verifying whether demand is truly real, he warned, could be disastrous for the company — even as taxi drivers, insurance agents and families pour borrowed money into chip stocks.
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