KOSPI roars back 4.33% — now the buy curb fires on the main board
KOSPI surged 4.33% to 6,634.55, tripping a buy-side sidecar 24 minutes after the open
The three lines
- KOSPI jumped 275.60 points (4.33%) to 6,634.55, reclaiming the 6,600 level
- A buy-side sidecar fired on the main board 24 minutes into the session
- Wall Street records, Iran draft-deal news and a chip rebound converged
Key questions
- Why did Korean stocks surge
- Three tailwinds landed at once: overnight records on Wall Street (Dow above 54,000 for the first time), news that a draft US-Iran deal is circulating, and a semiconductor rebound — Samsung Electronics up 4%+ and SK hynix 7%+ — with foreigners and institutions buying together.
- What is a sidecar and why does it matter here
- A five-minute pause on program trading triggered by sharp futures moves. It fired on KOSDAQ three straight sessions — and now on KOSPI itself, 24 minutes after the open. That spread is the measure of this market's volatility. A standing explainer published today covers the mechanics.
- So what was Monday's crash about
- A three-day round trip: -5.12% Monday (profit-taking), about -1% Tuesday, +4.33% Wednesday. The index is roughly back where it started — the violence of the path is the story of Korea's 2026 market.
Three days after its 5% plunge, Seoul swung back just as hard. KOSPI closed Wednesday up 275.60 points (4.33%) at 6,634.55, reclaiming 6,600 — and at 9:24am, 24 minutes into the session, the exchange fired a buy-side sidecar on the main board, the program-trading curb that had already tripped three straight days on KOSDAQ.
1. What pushed the index
New York first: overnight, the Dow closed above 54,000 for the first time and the S&P 500 set another record. Iran second: word of a circulating draft deal shaved another layer off the oil-and-war premium. Chips third: US tech strength translated directly into Samsung Electronics (+4%+) and SK hynix (+7%+), with foreigners (321bn won) and institutions (98bn won) buying from the open.
2. The three-day round trip
| Day | KOSPI | Event |
|---|---|---|
| Fri (Jul 31) | +17.91% record | historic surge |
| Mon | -5.12% (6,257.45) | profit-taking; KOSDAQ +2% |
| Tue | ~-1% (6,180s) | KOSDAQ +5.31%, sidecar |
| Wed | +4.33% (6,634.55) | KOSPI buy sidecar |
| KOSDAQ | up ~6%, above 800 | fourth straight gain |
The conclusion of the round trip: the index is back near its starting point, and the violence of the path is the real story. This week alone has added four sidecar halts to a year already setting activation records — today's standing explainer covers what the mechanism actually does.
3. What is still open
This rebound, like the US rally it imported, rests on the Iran assumption — whether the draft becomes a signature (world section) — and on AI earnings holding up (AMD, SpaceX pieces). Whether KOSDAQ's rotation survives KOSPI's recovery is the week's remaining question.