Seoul — October 02, 2026. Published after the market close. Korean index and single-stock prices are official exchange closing values; currency, crude and bond-yield quotes are time-stamped readings taken around the Seoul close, since those instruments trade continuously.
The 30-second version
- The KOSPI rose 0.46% to 7,003.74, reclaiming the 7,000 line for the first time in five sessions. The KOSDAQ slipped 0.11% to 893.29, pausing after Thursday’s 4.48% surge.
- It was an institution-led rebound: institutions bought a net KRW 410.4 billion (roughly $300 million) of KOSPI shares while retail investors sold a net KRW 1.81 trillion (about $1.3 billion) and foreigners sold KRW 83.4 billion.
- Oil refiners carried the index. SK Innovation jumped around 10% intraday and S-Oil about 7% after reports that Chinese refiners are halting refined-product exports from October; in readings around the Seoul close, WTI was quoted up 2.18% at $92.39 and Brent was back above $100 — though WTI later reversed and ended its session lower.
- The won strengthened: USD/KRW stood at 1,351.38 on the local 3:30 pm snapshot, down 5.4 won on the day.
A soft open, an institutional afternoon
The KOSPI opened slightly lower and chopped around for most of the morning. The turn came in the afternoon, when buying from institutions and other corporate accounts pushed the index into positive territory and held it there into the close — enough to finish back above 7,000, a level it had not closed above in five sessions.
A quick word on who these players are, since Korean flow data is unusually transparent. The exchange reports daily net buying by three groups: retail investors (individuals), foreign investors, and domestic institutions (pension funds, asset managers, insurers and the like). Today’s pattern was a textbook institution-led rebound: institutions net bought KRW 410.4 billion of KOSPI shares while individuals dumped KRW 1.81 trillion and foreigners sold a modest KRW 83.4 billion. In plain terms, domestic professional money stepped in front of heavy retail selling and won the day.
The KOSDAQ told the opposite story. Individuals (+KRW 132.3 billion) and institutions (+KRW 90.4 billion) were buyers there, but foreigners sold KRW 226.8 billion, and the index eased 0.11% to 893.29. That is less a reversal than a breather: the KOSDAQ had just surged 4.48% on Thursday to close at 894.29, so some profit-taking near the 900 line was unsurprising. One caveat on all of today’s flow and single-stock figures: they are compiled from intraday-to-close press reports, and tallies can differ slightly depending on whether they were taken at 3:30 pm or at the final settlement — per Newspim’s closing recap.
Why refiners stole the show
The day’s clear leadership came from oil refining. The trigger: reports that Chinese refiners are effectively halting exports of gasoline, diesel and other refined products from October, citing the need to rebuild domestic inventories. Layer on renewed Middle East tensions, and crude spiked: in quotes taken around the Seoul close, WTI was up 2.18% at $92.39 and Brent up 2.4% at $100.36, back above the $100-a-barrel mark. Crude trades around the clock, so these are time-stamped readings rather than official daily settlements — and indeed WTI subsequently gave back the gain and finished its own session lower.
Why does that help Korean refiners? Think of refining margins as the spread between the crude a refiner buys and the fuel it sells. If China — a major exporter of refined products in Asia — pulls its supply off the regional market, that spread widens for everyone still selling. The market priced that in fast: SK Innovation gained around 10% at one point, the day’s biggest large-cap move, S-Oil rose about 7%, and GS, the holding company with refining exposure, added somewhere between 2% and 6% depending on the tally.
Beyond energy, large-cap gainers included SK hynix (+0.44%), SK Square, Samsung Electro-Mechanics, LG Energy Solution, KB Financial and Samsung Life. On the losing side, Samsung Biologics fell 4.51%, Samsung Electronics preferred shares lost 1.71%, and Hyundai Motor slipped 0.72%. On the KOSDAQ, Cosmo Robotics dropped 5.66% as the previous session’s robotics-theme spike unwound.
The risk list has not gone away
Today’s rebound came with several unresolved worries attached. First, US rates: the 10-year Treasury yield spiked as high as 5.34% intraday in the previous session before pulling back after the Treasury announced a $6 billion buyback — relief, but not resolution. Second, the same oil rally that lifted refiners is a double-edged sword for Korea, a major energy importer: crude above $100 feeds import prices and revives inflation concerns. Third, investors are holding their breath ahead of the US September jobs report, which kept risk appetite in check today. Finally, local commentators continue to flag a structural quirk in the KOSDAQ rally: flows concentrated into large-cap semiconductor names via single-stock leveraged ETFs — funds that amplify one stock’s daily move — which can magnify volatility in both directions.
Key closing numbers
| Measure | Close | Change |
|---|---|---|
| KOSPI | 7,003.74 | +32.39 (+0.46%) |
| KOSDAQ | 893.29 | -0.98 (-0.11%) |
| USD/KRW (Seoul 3:30 pm snapshot) | 1,351.38 | -5.4 won (-0.40%) |
| WTI crude (quote near Seoul close; later reversed to end its session lower) | $92.39 | +2.18% |
| Brent crude (quote near Seoul close) | $100.36 | +2.4% |
| Russell 2000 (prior US session) | 2,817.55 | +0.74% |
What to watch next
- The US September jobs report — the main event markets were bracing for today.
- Whether Brent holds above $100 and how long China’s refined-product export halt actually lasts.
- US 10-year Treasury yields after the intraday spike to 5.34% and the $6 billion buyback response.
- Whether the KOSDAQ can retake the 900 line, and whether single-stock leveraged ETF concentration in semiconductors amplifies the next swing.
- Foreign investor flows — foreigners were net sellers on both boards today.
- Follow-through from the US Treasury’s newly announced sanctions on the “A7” Iran-linked financial network, given the Middle East angle in oil.
FAQ
Why did the KOSPI rise above 7,000 today?
Domestic institutions net bought KRW 410.4 billion of KOSPI shares in the afternoon, and together with other corporate accounts they absorbed the KRW 1.81 trillion of retail selling. That institutional bid, plus a strong rally in oil refiners, pushed the index up 0.46% to close at 7,003.74 — its first close above 7,000 in five sessions.
Why did Korean refiner stocks like SK Innovation and S-Oil jump?
Reports said Chinese refiners are halting refined-product exports from October to rebuild inventories. Less Chinese supply in Asia means better refining margins for Korean producers, and crude’s jump — Brent back above $100 in quotes around the Seoul close — amplified the move. SK Innovation rose around 10% intraday, S-Oil about 7%.
Why did the KOSDAQ fall while the KOSPI rose?
Profit-taking. The KOSDAQ had surged 4.48% the previous day to 894.29, so a 0.11% dip to 893.29 is a pause, not a reversal. Foreigners sold a net KRW 226.8 billion there while locals kept buying.
Is oil at $100 good or bad for the Korean market?
Both, depending on the sector. Refiners benefit from wider margins, which is why they led today. But Korea imports nearly all its energy, so sustained $100-plus crude raises import prices and inflation risk for the broader economy — one of the risk factors flagged at today’s close.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.
Related reading
Also on Seoul Closing Bell
A companion piece on the same session, written from a different angle: Why SK Innovation Rose Near 10% as China Halted Fuel Exports.