verdict at the close
KOSPI Closes +0.73% at 6,345.53 as Samsung Electronics Surges 4.13%
The KOSPI added +0.73% on Tuesday, August 11 (2026), closing at 6,345.53 after swinging across a 192.03-point intraday range — from a session low of 6,213.78 at 09:07 to a high of 6,405.81 in the early afternoon.The KOSDAQ gained +0.39% to close at 857.84, having traded within a 34.71-point band (low 840.45, high 875.16); foreign investor flow data for KOSDAQ was not collected today.
The day’s path
A window marking the hours when direction turned during the session
KOSPI Trough at 6,213.78 (09:07), Rally to 6,405.81 by Early Afternoon, Fade to Close at 6,345.53
Top by trading value10— snapshot
A window on how the top trading-value names have moved up to this hour
Samsung Electronics Printed Its Session High of ₩243,000 at 13:00; KOSPI Peaked at 6,405.81 Around 13:32
| Stock | Prior close | Open | Gap | High (time) | Close | Change | Low (time) |
|---|---|---|---|---|---|---|---|
| Samsung Electronics | 230,001 | 229,500 | −0.22% | 243,000 (13:00) | 239,500 | +4.13% | 227,500 (09:15) |
| SK hynix | 1,420,030 | 1,405,000 | −1.06% | 1,455,000 (13:50) | 1,425,000 | +0.35% | 1,373,000 (10:05) |
| Samsung Electro-Mechanics | 1,273,975 | 1,238,000 | −2.82% | 1,297,000 (13:35) | 1,262,000 | −0.94% | 1,191,000 (10:05) |
| SK Square | 948,986 | 929,000 | −2.11% | 960,000 (13:35) | 945,000 | −0.42% | 901,000 (09:00) |
| Samsung Electronics (Pref.) | 171,996 | 170,000 | −1.16% | 181,700 (13:40) | 180,200 | +4.77% | 169,400 (09:00) |
| Hanwha Solutions | 35,250 | 34,200 | −2.98% | 38,250 (09:15) | 36,350 | +3.12% | 32,900 (09:00) |
| Daewon Cable | 14,951 | 15,050 | +0.66% | 16,160 (09:10) | 14,520 | −2.88% | 14,520 (14:30) |
| Samwha Capacitor | 81,203 | 79,200 | −2.47% | 92,800 (13:55) | 84,500 | +4.06% | 77,000 (09:05) |
| Celltrion | 200,993 | 200,000 | −0.49% | 212,000 (11:10) | 210,500 | +4.73% | 199,100 (09:00) |
| KB Financial Group | 171,699 | 172,600 | +0.52% | 172,700 (09:00) | 166,600 | −2.97% | 166,000 (13:55) |
Samsung Electronics opened at ₩229,500, dipped to a low of ₩227,500 at 09:15, then rallied to ₩243,000 at 13:00 before closing at ₩239,750 (per intraday data; the daily-prices table shows ₩239,500) on ₩5.51tn in turnover.SK hynix moved from an open of ₩1,405,000 to a low of ₩1,373,000 at 10:05 and a high of ₩1,455,000 at 13:50, closing at ₩1,428,000; the broad KOSPI index reached its day high of 6,405.81 shortly after 13:30 before fading to the 6,345 area into the close.
Flow summary
A window on how much foreign investors, retail investors, investment firms and pension funds each bought and sold
Foreigners Provisionally Net Buy ₩44.5bn on KOSPI Today but Remain Net Sellers of ₩101.33tn for the Quarter
The stocks that moved the market — top by turnover10
A window on which investor groups backed the most heavily traded stocks
Samsung Electronics (₩5.51tn) and SK Hynix (₩5.21tn) Capture Over Half of KOSPI’s Top-Ten Turnover
Samsung Electronics (₩5.51tn) and SK hynix (₩5.21tn) together accounted for the two heaviest KOSPI tickets on the day, followed by Samsung Electro-Mechanics at ₩904.6bn.On KOSDAQ, Jusung Engineering led with ₩519.0bn, followed by Jeju Semiconductor at ₩282.9bn and Alteogen at ₩245.4bn — the latter closing down -5.89%.
| Stock | Close | Change | Turnover | Foreign investors | Institutions | Investment firms | Pension funds | Retail investors |
|---|---|---|---|---|---|---|---|---|
| Samsung Electronics | ₩239,500 | +4.13% | ₩5.51tn | — | — | — | — | — |
| SK hynix | ₩1,425,000 | +0.35% | ₩5.21tn | — | — | — | — | — |
| Samsung Electro-Mechanics | ₩1,262,000 | −0.94% | ₩904.7bn | — | — | — | — | — |
| SK Square | ₩945,000 | −0.42% | ₩443.7bn | — | — | — | — | — |
| Samsung Electronics (Pref.) | ₩180,200 | +4.77% | ₩422.7bn | — | — | — | — | — |
| Hanwha Solutions | ₩36,350 | +3.12% | ₩332.0bn | — | — | — | — | — |
| Daewon Cable | ₩14,520 | −2.88% | ₩265.6bn | — | — | — | — | — |
| Samwha Capacitor | ₩84,500 | +4.06% | ₩201.7bn | — | — | — | — | — |
| Celltrion | ₩210,500 | +4.73% | ₩184.9bn | — | — | — | — | — |
| KB Financial Group | ₩166,600 | −2.97% | ₩174.8bn | — | — | — | — | — |
Gainers5· Decliners5 — KOSPI & KOSDAQ
A window on the biggest gainers and decliners, and the reasons behind them
Defense Stocks Dominate KOSPI Decliners; KOSDAQ’s Bon Neu Hits +30% Upper Limit
On the KOSPI losers board, defense and aerospace names clustered near the bottom: Korea Aerospace Industries -12.07%, LIG Defence & Aerospace -7.65%, Hanwha Ocean -5.72%, Hyundai Rotem -5.86%, and Hanwha Systems -5.57% — all with turnover above ₩100bn.On the KOSDAQ advance list, Bon Neu hit the daily Daily Price Limit (Upper)Korean exchanges cap single-day gains at +30% from the previous close; a stock hitting that ceiling is said to have reached the upper limit.Bon Neu closed exactly at the +30% upper limit on KOSDAQ today, making it the headline mover on the small-cap board. at +30.00% on ₩105.2bn in turnover, while Jusung Engineering gained +12.15% on ₩519.0bn; Alteogen was the session’s heaviest KOSDAQ decliner with ₩245.4bn traded, closing -5.89%.
After-Hours Outlook
A window on what to watch in after-hours trade once the regular session ends
Overnight S&P 500 Futures Down 0.13%, Nikkei Futures Down 0.57% — Tokyo Market Reopens Wednesday After Holiday Closure
As of the 05:00 KST snapshot, S&P 500 futures were off -0.13% at 7,777.25 and Nasdaq 100 futures were down -0.48% at 29,764.25; Nikkei CME futures were -0.57% at 66,705, with Tokyo set to reopen Wednesday after today’s Mountain Day holiday.In the 2026 regime, on the 46 sessions where both Korean and US markets moved in the same direction simultaneously (two-way follow-through), the pattern has been observed in 46 of 139 trading days year-to-date; no brokerage reports were collected for this session, so sector-level context for after-hours positioning is not available today.