Korea’s stock rocket is really an AI chip trade

The “diversified” ETF that isn’t

South Korea’s stock market has been on a heater: the KOSPI jumped 31% in April and is up about 55% year to date, with the country’s market cap now around $4.2 trillion. That’s enough to push Korea past the U.K. and into the world’s eighth-largest equity market. Not bad for a month that usually doesn’t make headlines unless something is on fire.

The catch: it’s mostly chips

Here’s the twist: a lot of the rally is being driven by a very small slice of the market. Samsung Electronics and SK Hynix dominate the index and make up roughly 45% of the iShares MSCI South Korea ETF (EWY), so buying Korea exposure right now is a lot like ordering a “mixed” fruit bowl that somehow contains mostly bananas.

The real story is AI demand. Tight supply in high-end memory and DRAM chips, plus the ongoing data-center buildout, has been lifting the semiconductor complex. That’s great if you’re bullish on the AI supply chain. It’s less great if you thought you were just buying a broad bet on the South Korean economy.

Why ETF investors should care

Money has been pouring into EWY anyway — roughly $6.4 billion in inflows this year — and investors have also been spreading some cash into broader funds like EEM, VWO, VEA, and EFA. But the concentration risk is the headline: if the memory cycle cools or AI spending slows, this trade could unwind faster than a TikTok trend.

Big picture: South Korea’s rally may look broad on the surface, but for ETF investors it’s still mostly a high-stakes wager on semiconductors, not a full-country victory lap.