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Taiwan’s retail investors are loading up on borrowed money to ride the AI wave. Margin debt has climbed by more than $13 billion, reaching its highest level since September 2000.
The catalyst is no mystery. TSMC, the chipmaker that manufactures the silicon brains powering the global AI boom, now accounts for more than 40% of Taiwan’s benchmark index. Its shares have more than doubled over the past year.
The margin debt surge
The pace of borrowing has been staggering. Around late May and early June 2026, margin debt spiked by NT$21.3 billion, roughly $680 million, in a single day.
To put that in context, Taiwan’s total equity market capitalization has reached approximately $4.95 trillion. That’s enough to briefly surpass India’s stock market cap, a country with about 60 times Taiwan’s population. The benchmark index touched records near 45,614 points in early June, its highest level in 25 years.
Regulatory fuel on the fire
Taiwan’s Financial Supervisory Commission made a notable policy change in April 2026, allowing equity funds to hold up to 25% of their net assets in a single stock. Previously, concentration limits were tighter. The move was practically tailor-made for TSMC, the only stock large and liquid enough for most funds to even consider loading up to that threshold.
Why the bubble debate is complicated
Taiwan’s market P/E ratio hovers around 21, which is actually below Nasdaq levels. That’s partly because TSMC’s earnings have been so strong that the stock’s valuation, while elevated, isn’t detached from fundamentals. Some analysts have argued that calling this an AI bubble in 2026 overstates the case, precisely because the earnings growth is real and substantial.
Geopolitics adds another layer of complexity. Taiwan sits at the center of US-China tensions, and heavy foreign selling has already been a feature of recent months, even as domestic retail investors have been borrowing to buy what foreigners are selling.
When more than 40% of an index is one company, diversification becomes an illusion. The comparison to September 2000 matters because margin debt peaks reliably appear near market tops, representing the final wave of buyers who have exhausted their cash and turned to credit. Whether Taiwan’s AI-fueled rally has more room to run depends largely on TSMC’s ability to keep delivering earnings beats. If the next few quarters show any deceleration in AI chip demand, or if geopolitical tensions flare, the $13 billion in additional margin debt becomes kindling rather than fuel.
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