10:00verdict at this hour
Wall Street selloff ripples into Seoul open — KOSDAQ gaps lower as defense and power stocks retreat
The KOSPI opened at 6,759.95 on Friday, August 21 (2026), dipping below the prior close before recovering toward 6,910 by 09:48, then retreating; the KOSDAQ gapped down at 824.05 and ground lower through the opening hour, touching 807.05 by 09:52.The overnight backdrop included S&P 500 futures off 0.97%, Nasdaq 100 futures off 1.20%, and Nikkei 225 futures (CME, yen-denominated) down 1.18% as of 05:00 KST, alongside a U.S. 10-year Treasury yield that climbed 0.92% to 4.70% — multiple macro cross-currents were in play simultaneously.
10:00Snapshot
A window that records the market at that hour, like a photograph
KOSPI opens with a ₩4.04 gap below prior close and recovers toward 6,910 by 09:48 before retreating; KOSDAQ presses lower through the first hour
Top by trading value10— snapshot
A window on how the top trading-value names have moved up to this hour
SK hynix and Samsung Electronics drive KOSPI turnover to ₩2.22tn combined in the first hour; Kumho names and SK Securities dominate the active movers list
By 09:52 KST, SK hynix led KOSPI turnover at ₩1.30tn and Samsung Electronics followed at ₩918.2bn, together accounting for the bulk of activity; both stocks reached their intraday highs at 09:48, with SK hynix touching ₩1,771,000 and Samsung Electronics reaching ₩276,000.On the KOSDAQ, Ingenia Therapeutics (Reg.S) led turnover at ₩148.7bn, followed by Gido Industry at ₩87.8bn and Danal at ₩57.1bn; HPSP, Alteogen, and Jusung Engineering were also active, with Alteogen trading at ₩28.6bn and falling 5.15% from its open by the 09:52 snapshot.
| Stock | Prior close | Open | Opening GapThe difference between the previous session’s closing price and today’s opening price; a gap down means the market opened below yesterday’s close without trading the levels in between.A gap signals information that arrived overnight — earnings, macro data, geopolitical news — and its size and subsequent fill pattern are early indicators of session tone. | High (time) | Last at 10:00 | Change | Low (time) |
|---|---|---|---|---|---|---|---|
| Samsung Electronics | 271,000 | 267,000 | −1.48% | 276,000 (09:48) | 272,500 (10:00) | +0.55% | 266,000 (09:03) |
| SK hynix | 1,691,000 | 1,675,000 | −0.95% | 1,773,000 (09:52) | 1,754,000 (10:00) | +3.73% | 1,671,000 (09:01) |
| Samsung Electronics (Pref.) | 191,200 | 190,100 | −0.58% | 207,500 (09:49) | 204,000 (10:00) | +6.69% | 190,200 (09:01) |
| Samsung Electro-Mechanics | 1,396,000 | 1,345,000 | −3.65% | 1,348,000 (09:11) | 1,326,000 (10:00) | −5.01% | 1,321,000 (09:01) |
| SK Square | 1,123,000 | 1,096,000 | −2.40% | 1,141,000 (09:48) | 1,118,000 (10:00) | −0.45% | 1,079,000 (09:01) |
| Kumho E&C | 15,650 | 15,650 | +0.00% | 18,200 (09:25) | 16,120 (10:00) | +3.00% | 14,810 (09:02) |
| Kakao | 38,700 | 38,150 | −1.42% | 38,650 (09:04) | 36,350 (10:00) | — | 36,100 (09:32) |
| Samsung Life Insurance | 296,989 | 291,500 | −1.85% | 306,500 (09:52) | 298,000 (10:00) | — | 287,000 (09:01) |
| SK Securities | 2,810 | 2,920 | +3.91% | 3,555 (09:05) | 3,220 (10:00) | +14.59% | 3,000 (09:01) |
| Kumho Electric | 7,460 | 8,000 | +7.24% | 9,690 (09:24) | 9,120 (10:00) | +22.25% | 7,810 (09:02) |
Among individual trajectories, Kumho Electric opened at ₩8,220, reached its session high of ₩9,690 at 09:24, then pulled back — a wide intraday range of ₩1,880 in under 25 minutes.SK Eternix moved in the opposite direction, opening at ₩54,100, peaking at ₩55,700 at the open, then sliding to an intraday low of ₩51,000 at 09:49 — a decline from open to low of ₩3,100; Doosan Enerbility similarly opened near its high of ₩77,900 at 09:00 and reached its low of ₩73,700 at 09:35.
Gainers5· Decliners5— snapshot
A window on the biggest gainers and decliners, and the reasons behind them
Broad-based declines across 10 of 12 sectors; financials and select chipmakers hold positive ground as defense, power, and small-cap tech retreat
On the KOSPI, the advance side was narrow: Kumho Electric surged +28.95%, SK Securities +15.30%, and Kumho Construction +12.65% — all concentrated in names with company-specific catalysts rather than sector themes — while SK hynix added +1.42% and Samsung Electronics preferred shares gained +3.66%.The decline side was broader and heavier: Doosan Fuel Cell fell -10.46%, LIG Defense & Aerospace -8.64%, OCI Holdings -7.59%, SK Eternix -7.14%, and Hanwha Solutions -6.96%; on the KOSDAQ, Komico surged +27.52% but the decline list included SPG -7.54%, D&D Pharmatech -7.44%, Robotis -7.24%, and Gido Industry -7.22%.Physical-AI sub-themes reflected the broader pressure: robotics names tracked at -5.23% (n=2) and humanoid names at -5.04% (n=3), while autonomous driving slipped -1.62% (n=2); sector-level flow data for each group was not collected in this data run.