How TSMC and One Regulatory Change Lifted Taiwan's Stock Market Past India

Over the past year, that movement has been almost entirely upward. Fueled by insatiable global demand for advanced AI chips, TSMC's share price surged approximately 87% . As the exclusive manufacturer of Nvidia's Blackwell accelerators, AMD's MI-series chips, and Apple's custom silicon, TSMC sits at the single point of failure—and success—for the world's AI infrastructure buildout . By late April 2026, TSMC's market cap alone stood at around $1.8 trillion . The stock's rally pushed the TAIEX benchmark to six new all-time highs in 2025 and added roughly NT$20 trillion (over $600 billion) to Taiwan's total market value that year .

The rule change that lit the fuse

The AI boom provided the fuel, but a specific regulatory decision provided the spark for overtaking India. On April 23-24, 2026, Taiwan's Financial Supervisory Commission (FSC) eased a critical investment restriction. Local equity funds and actively managed ETFs were suddenly permitted to invest up to 25% of their net assets in any single listed company whose weight exceeds 10% of the exchange—up from a previous 10% cap .

Because TSMC was the only stock above that 10% threshold, it was the rule's sole beneficiary . The change mechanically unlocked billions of dollars in potential new domestic fund inflows that had previously been blocked by the concentration limit. The market reaction was immediate: TSMC shares surged more than 5% on April 24, helping drive the broader Taiwanese market up 3.23% in a single session . The rule change didn't just fuel TSMC's rally—it gave the stock a new, structural bid from domestic institutional money that foreign investors were already chasing.

The AI flywheel underneath it all

While the fund-cap rule provided the final push past India, the fundamental engine is the global AI buildout. TSMC holds a roughly 70% share of the global semiconductor foundry market and essentially 100% of the market for the most advanced nodes used in cutting-edge AI accelerators . Every major AI chip designed in Silicon Valley flows through its fabs in Hsinchu. This structural monopoly on AI compute manufacturing has turned TSMC into a leveraged bet on the entire AI industry, and by extension, turned Taiwan's stock market into a proxy for AI infrastructure spending.

The numbers bear this out. TSMC's weighting in the TAIEX has roughly tripled over the past decade . In the Year of the Snake alone, its shares soared almost 69% . By February 2026, its market capitalization had crossed the $2 trillion mark . Investor enthusiasm for AI-linked technology stocks has been so extreme that Taiwan's total market cap rose from eighth place globally at the end of 2025 to seventh, then sixth, and finally fifth within a matter of months .

The concentration paradox: strength and fragility

Taiwan's ascent exposes a structural paradox. Strip out TSMC, and the remaining 1,000-plus listed Taiwanese companies would collectively rank around fifteenth globally in market value . The market's strength is almost entirely co-located with a single company and a single technology theme. This makes Taiwan's equity market exceptionally powerful during AI upswings—but also uniquely fragile. A sustained downturn in semiconductor demand, a geopolitical disruption affecting TSMC's operations, or simply a rotation out of AI stocks could unwind the ranking gains as quickly as they appeared.

India's market, by contrast, reflects a much more diversified economy. The IMF estimates India's overall GDP at $4.15 trillion, more than four times Taiwan's $977 billion economy . Its stock market draws strength from a broad mix of sectors—financials, IT services, conglomerates, and consumer goods—none of which carries a 44% index weight. India lacks a comparable single-stock AI catalyst, but it also lacks the single-stock concentration risk that now defines Taiwan's market.

Broader reforms that laid the groundwork

The fund-cap change was the most direct and impactful regulatory move, but it didn't happen in isolation. Taiwan has been systematically opening its capital markets. Offshore foreign institutional investors (FINIs) can now appoint multiple local custodians, a rule that took effect in February 2025 . Securities borrowing and collateral rules were relaxed in August 2024, giving foreign investors more flexibility with their onshore assets . The TWSE has publicly pursued an "Asian Nasdaq" strategy, easing listing requirements for foreign startups and companies with no mainland Chinese capital involvement . These reforms improved overall market accessibility and likely increased foreign participation over time, but none had the immediate, mechanical price impact of letting domestic funds double their maximum TSMC allocation overnight.

The lesson from Taiwan's climb is a concentrated one: in a market where one company represents nearly half the value, a single regulatory tweak aimed at that company can move an entire country's global ranking. The AI boom set the stage. The fund-cap rule change crossed the finish line. And the world's fifth-largest stock market now rests, more than anywhere else, on a single bet that the world will keep needing more advanced chips.