In Korea’s regular trading session (09:00–15:30) on September 1, 2026, the KOSPI closed at 6,835.80 points, up 15.78 points (+0.23%) from the previous trading day, while the KOSDAQ fell 13.04 points (-1.56%) to 821.25 points. Among the tracked stocks, SK Square (+2.89%) and SK hynix (+1.14%) outperformed the KOSPI’s gain, while Hyundai Motor (-0.74%) closed in the opposite direction of the index.
| Index | September 1, 2026 regular-session close | Change from previous trading day |
|---|---|---|
| KOSPI | 6,835.80 points | +15.78 points (+0.23%) |
| KOSDAQ | 821.25 points | -13.04 points (-1.56%) |
KOSPI Rebounds, While KOSDAQ Closes Near Its Intraday Low
The KOSPI opened at 6,784.29 points in the September 1, 2026 regular session, rose as high as 6,857.35 points intraday, and reached a low of 6,732.47 points. Its close of 6,835.80 points was 51.51 points above the open and 21.55 points below the intraday high. It was a regular-session close up +0.23% from the previous trading day. KOSPI closing data for September 1, 2026
The KOSDAQ opened at 831.96 points, recorded an intraday high of 833.52 points and low of 815.52 points, and closed at 821.25 points. The close was 10.71 points below the open and 5.73 points above the intraday low, with a -1.56% decline from the previous trading day. The KOSPI and KOSDAQ closed in opposite directions, but simultaneous moves on a single trading day alone cannot establish capital flows between the two markets or sector-specific causes. KOSDAQ closing data for September 1, 2026
SK Square Rises 2.89%, the Largest Gain Among Tracked Stocks
SK Square closed at 1,067,000 won on September 1, 2026, up 30,000 won (+2.89%) from the previous trading day. It recorded the largest percentage move among the four tracked stocks and outpaced the KOSPI’s +0.23% gain on the same trading day by 2.66 percentage points. Its regular-session open was 1,035,000 won, intraday high was 1,072,000 won, intraday low was 1,010,000 won, and volume was 567,994 shares. The close was 32,000 won above the open and 5,000 won below the intraday high. Previous analysis is available through SK Square closing data for September 1, 2026 and the SK Square stock hub.
SK hynix rose 19,000 won (+1.14%) from the previous trading day to 1,693,000 won. It recorded a regular-session open of 1,670,000 won, high of 1,713,000 won, low of 1,652,000 won, and volume of 3,532,528 shares. The close was 23,000 won above the open but 20,000 won below the intraday high. Its gain exceeded the KOSPI’s by +0.91 percentage points, but this relative comparison alone does not establish that semiconductor stocks drove the index. SK hynix closing data for September 1, 2026 and the SK hynix stock hub can be viewed together.
Samsung Electronics Edges Higher; Hyundai Motor Moves Opposite the KOSPI
Samsung Electronics rose 1,000 won (+0.38%) from the previous trading day to 261,000 won on September 1, 2026. This was 0.15 percentage points higher than the KOSPI’s gain. Its regular-session open was 259,500 won, intraday high was 262,500 won, intraday low was 254,000 won, and volume was 17,966,613 shares. The close was 1,500 won above the open and 1,500 won below the intraday high. Past analysis is available through Samsung Electronics closing data for September 1, 2026 and the Samsung Electronics stock hub.
Hyundai Motor closed at 400,500 won, down 3,000 won (-0.74%) from the previous trading day. It moved in the opposite direction on the same trading day that the KOSPI rose +0.23%, with a relative performance gap of -0.97 percentage points versus the KOSPI. Its regular-session open was 404,000 won, high was 408,000 won, low was 396,500 won, and volume was 626,092 shares. The close was 3,500 won below the open and 4,000 won above the intraday low. Individual stock performance can be followed through Hyundai Motor closing data for September 1, 2026 and the Hyundai Motor stock hub.
Investor Flow Figures and Explanations Cited in Articles Should Be Read Separately
Investor flow figures for September 1, 2026 were listed as retail investors -5,398 hundred million won, foreign investors -4,919 hundred million won, and institutional investors -6,340 hundred million won. On a day when all three investor categories were shown as negative, the KOSPI closed +0.23% higher and the KOSDAQ closed -1.56% lower. However, the fact that these investor flow figures and index closes were observed on the same trading day alone does not establish that transactions by a particular investor group caused the closing direction of the indexes or individual stocks. Investor flow data by investor type for September 1, 2026
Article explanations about the reasons for the regular-session close should also be considered separately from the data. A Yonhap News pre-market outlook report dated September 1, 2026 cited Middle East tensions and weakness in U.S. equities in its headline. This was the article’s market interpretation presented before the regular-session close and cannot be established as a direct cause of the KOSPI’s closing gain or the KOSDAQ’s decline. Original Yonhap News article
An opening-market report the same day cited renewed U.S.-Iran conflict in its headline as a backdrop for weakness in Korean equities, while another report addressed a surge in oil prices and inflation concerns following renewed armed conflict with Iran. However, the collected data do not include regular-session comparison figures for oil prices, exchange rates, or interest rates on September 1, 2026, so these are not linked as explanations for that day’s index and tracked-stock closing prices. Original opening-market article Original oil-price and inflation article
Three Items to Check in the Next Regular Session
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For the KOSPI, the next regular-session close can be compared against the September 1, 2026 close of 6,835.80 points and intraday high of 6,857.35 points; for the KOSDAQ, it can be compared against the close of 821.25 points and intraday low of 815.52 points. These are observation benchmarks, not directional forecasts.
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For the tracked stocks, the next regular session can be used to check how the gaps between the September 1, 2026 moves of SK Square +2.89%, SK hynix +1.14%, Samsung Electronics +0.38%, Hyundai Motor -0.74%, and the KOSPI’s +0.23% change.
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Investor flow figures listed as retail investors -5,398 hundred million won, foreign investors -4,919 hundred million won, and institutional investors -6,340 hundred million won on September 1, 2026 can be compared with the next regular-session figures alongside closing prices. The premise remains that causation should not be established from investor flow figures for a single trading day alone.