Korea's benchmark snapped a three-day rally hard. The Kospi closed at 6,562.72, down 273.08 points or 3.99%, and the Kosdaq fell 2.10% to 803.98, as reported by Seoul Economic Daily. Japan's Nikkei lost 2.9% and MSCI's Asia-Pacific ex-Japan index dropped 2%, per Reuters.

Two names did most of the damage

Samsung Electronics closed at ₩250,500, down 4.02%. SK hynix closed at ₩1,613,000, down 4.73%. Those two are now more than half the Kospi's entire market cap, so on the arithmetic alone they explain a bit over half the index's 3.99% fall. The rest came from SK Square -7.97% — a holding company whose main asset is its SK hynix stake, which is why it falls harder than hynix itself — plus Hyundai Motor -5.62%, LG Energy Solution -5.31% and Samsung C&T -4.48%.

Nothing broke in Korea. Two numbers broke elsewhere

The US launched airstrikes on Iran on Tuesday. Brent rose 0.9% to $95.45, a five-week high, and the US 10-year Treasury yield hit 4.8122% intraday — its highest in almost three years (Reuters). Expensive oil plus the highest long rates since 2023 is about the worst possible pairing for an index this concentrated in richly-valued chip stocks.

The buybacks lost

Foreigners sold a net ₩1.91 trillion and institutions ₩2.04 trillion; retail investors absorbed it, buying ₩2.30 trillion. Samsung (₩15tn programme) and SK hynix (₩40tn) have been buying roughly ₩1.6 trillion of their own stock a day — and since late August, foreign and institutional selling has run to ₩13.9 trillion, about 92% of everything the companies bought. Corporate bids are big, but they are not the marginal buyer right now.

The ripple worth naming

Hyundai Motor's 5.62% drop is the clean oil transmission: $95 Brent means higher US pump prices, and Hyundai's profit engine is the larger SUVs it sells in America. LG Energy Solution takes the second-order hit through the same channel — it runs a $4.3bn battery cell joint venture in Georgia built to supply Hyundai's US plants, so a softer Hyundai volume outlook is a softer order book for LGES.

What flips it

Friday. The US August jobs report lands at 8:30am ET on Sept 4. Today's move is priced off a 10-year that will not come down; a soft payroll print pulls it back off 4.81% and the foreign money that sold ₩1.9tn today has an obvious reason to come back. Watch the two levels that caused this: whether Brent holds $95, and whether the 10-year holds above 4.80%.

As of 2 Sep 2026, ~7:40pm IST / 10:10am ET. Sources: Seoul Economic Daily, Seoul Economic Daily (flows), Reuters, LG Energy Solution. For discussion and education only — not investment advice. Verify before acting.