Here’s a strange problem to have: your best investments are performing so well that you’re legally required to stop buying them.
That’s essentially the situation facing emerging-market equity fund managers right now. TSMC, Samsung Electronics, and SK Hynix have grown so dominant in EM portfolios that many managers are bumping up against their internal mandate limits on single-stock and sector concentration. The result is a forced rotation, not because anyone turned bearish on semiconductors, but because the rules say you can’t put all your eggs in three very expensive baskets.
The concentration problem
These three semiconductor giants now account for roughly 24% of the MSCI Emerging Markets Index weight. Nearly a quarter of an index designed to capture broad exposure across dozens of developing economies is sitting in three chip companies headquartered in Taiwan and South Korea.
A JPMorgan report from June 2026 flagged the issue directly, noting that many international EM fund managers were approaching or hitting their concentration ceilings. When a fund’s mandate says it can’t hold more than, say, 10% in a single name, and that name keeps appreciating, the math eventually forces your hand.
