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Kospi Jumps 3.7% as Samsung, SK Hynix Lead Chip Rebound
Why is the Kospi up today?
The Kospi (KS11) rose 3.7% to 5,206 on Tuesday as Samsung and SK Hynix led a chip-stock rebound after a US chip rally, tripping a buy sidecar at the open.
Key numbers
| Kospi close | 5,206+3.75% (another report: +3.6%) |
|---|---|
| Kospi open | 5,247.22+4.55% vs Monday's 5,018.85 |
| US chip index (SOX), Monday | +6.85%AMD +13.26%, Broadcom +8.78% |
| Samsung Electronics, early trade | 199,400 won+5.00% |
| SK hynix, early trade | 1,216,000 won+7.04% |
| Foreign net buying | 136.2B wonper [6] |
What happened
The Kospi (KS11) rose 3.7% to 5,206 on Tuesday as Samsung and SK Hynix led a chip-stock rebound after a US chip rally, tripping a buy sidecar at the open. A buy sidecar is a five-minute pause on automated buy orders that calms sharp jumps; it kicked in at 9:06 a.m. after futures rose over 5%. Samsung ended up 3.7% and SK hynix 5.3%, after the Kospi lost about 11% last week on fears of tighter US AI rules. Foreign investors bought a net 136.2 billion won of shares.
Why it matters
The Kospi, South Korea's main stock index, leans heavily on Samsung Electronics and SK hynix, so Tuesday's chip-led jump moved the whole market. The swings show how sensitive prices are to news about AI spending and US rules. Cheaper oil on hopes of an end to the US-Iran war also eased inflation worries. One analyst thinks a sideways trend is likelier than a sharp recovery.
Who this affects
- MarketbullishMedium impact
- Korean stock investors win back part of last week's losses.
- CompanybullishMedium impact
- Samsung and SK hynix shareholders gain after a sharp selloff.
- CompetitorsbullishLow impact
- US chip rivals AMD, Broadcom and Micron also jumped overnight.
- IndustrymixedMedium impact
- AI chip makers still face US regulation worries.
Kospi vs Nikkei 225, Taiex, Hang Seng
| KospiKS11 | 5,219 | +4.0% |
|---|---|---|
| Nikkei 225N225 | 60,279 | +2.6% |
| TaiexTWII | — | +3.4% |
| Hang SengHSI | 24,536 | +0.4% |
As of 2026-11-10T03:44:00Z
How we got here
Democrats win US midterms, raising worries about tighter AI rules and weaker chip demand.
Kospi closes down 0.81% at 5,018.85 as foreigners sell a net 658 billion won.
Wall Street rebounds: S&P 500 up 2.3%, Nasdaq up 2.7%, as oil prices fall.
Kospi opens 4.55% higher; buy sidecar triggers at 9:06 a.m..
What to watch
- Whether foreign investors keep buying Korean shares after Tuesday's net 136.2 billion won purchase.2026-11-11
- Whether chip stocks hold gains or drift sideways, as one analyst expects.2026-11-11
- Nvidia, down 4.3% Monday amid controversy over its CEO, and its effect on Korean chip stocks.Q4 2026
Educational content only. Not investment advice.
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