Seoul’s circuit breakers fired before most U.S. investors finished their morning coffee, and a surprise inflation print from Washington is making a bad situation worse for anyone holding Korean chipmakers.
The Korea Exchange suspended program trading shortly after the open on Thursday, October 15, 2026, when benchmark futures breached the exchange’s trigger. That pause is a circuit breaker meant to slow computer-driven selling, and it made a long decline impossible to ignore.
The Kospi opened at 5,673.01, down 5.59%. By midday it was off nearly 8% at around 5,540. These are intraday figures, because the Seoul close lands overnight U.S. time, and they leave the index roughly 41% below its June 2026 record of 9,385.59.
A U.S. inflation report set off this leg of the decline. September consumer prices rose 0.6% for the month and 3.7% from a year earlier, above the 3.6% annual pace economists expected.
Most U.S. investors own this market through the iShares MSCI South Korea ETF (NYSEARCA:EWY). It closed at $159.83 on October 14, down 4.04%, and then fell another 2.90% to $155.20 after hours.
Foreign Sellers Keep Draining a Concentrated Market
The Kospi closed Wednesday at 6,008.81, down 0.44%, for its sixth straight losing session. If Thursday also closes lower, the run reaches seven sessions, the longest since September 2024.
Foreign investors have been net sellers for the eighth straight session, and they sold a net 284.7 billion won right after Thursday’s open. In an index this concentrated, that selling hits the same few stocks every day, and nothing else in the market is big enough to absorb it.
The S&P 500 fell 1.11%, and the Nasdaq fell 1.88% on October 14 as traders priced in U.S. interest rates staying higher for longer. The 10-year Treasury yield was already 5.21% on October 13.
Higher U.S. rates tend to push the won down, so a foreign owner of Korean stocks loses on the share price and the currency at the same time. When most foreign owners take that same double hit, they all try to sell at once.
Two Chipmakers Tie the Fund to AI Sentiment
Korean chipmakers are among the most volatile ways to own the AI spending boom. Foreign investors sold them on fresh expectations of rate hikes and growing questions about how the AI investment boom is being paid for.
Samsung Electronics fell 5.17% to 220,000 won early Thursday. At mid-session, SK hynix was down 11.06% to 1,262,000 won.
As of May 31, 2026, SK hynix made up 30.85% of EWY’s net assets, and Samsung made up 23.88%, for a combined 54.73%. With more than half its money in two memory chipmakers, the fund rises and falls with AI sentiment, which is why investors looking for AI exposure without that memory-chip concentration sometimes turn to the picks and shovels suppliers behind the data center expansion (we gathered seven of them, covering power and cooling, in a free report).
Taiwan Semiconductor Manufacturing (NYSE:TSM | TSM Price Prediction) is the largest contract chipmaker, so its outlook is the clearest check on AI chip demand. Seo Sang-young, managing director at Mirae Asset Securities, said: “TSMC earnings due later in the session will be the turning point that determines further volatility.” Even firm guidance will likely only slow foreign selling, because the U.S. rate outlook started this leg.
What EWY Holders Face Until Foreign Selling Stops
EWY will likely stay under pressure until foreign selling stops. You take the index move and the currency move together, and the after-hours drop had already priced in much of Thursday’s Seoul session before most U.S. investors were awake.
The fund is 16.7% below its October 2 close of $191.88 and 27.6% below its 52-week high of $220.89. It is still up 64.39% year to date, so foreign holders still have plenty of gains to lock in.
The iShares Core MSCI Emerging Markets ETF (NYSEARCA:IEMG) offers Korean exposure with less concentration. It spreads money across many countries, which reduces the two-stock concentration that drives EWY.
The selling in EWY will likely ease only once Seoul posts a session of net foreign buying and the fund climbs back above $191.88. Until both happen, nothing in the data shows the selling is over.
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