During Korea’s regular trading session (09:00–15:30) on September 7, 2026, the KOSPI closed at 6,995.39 points, up 308.18 points (+4.61%) from the previous trading day and approaching 7,000. The KOSDAQ also rose 8.69 points (+1.07%) to 822.19 points, but its gain was 3.54 percentage points lower than that of the KOSPI. Among the tracked stocks, SK Hynix and SK Square recorded particularly large closing gains.
| Index | September 7, 2026 regular-session close | Change from previous trading day | Data |
|---|---|---|---|
| KOSPI | 6,995.39 points | +308.18 points (+4.61%) | Closing data |
| KOSDAQ | 822.19 points | +8.69 points (+1.07%) | Closing data |
KOSPI Ends Just Below 7,000
The KOSPI opened at 6,910.78 points on September 7, 2026, hit an intraday low of 6,867.91 points, and then extended its gains. Its intraday high was 6,995.40 points, while the regular-session close was 6,995.39 points, 0.01 points below the intraday high. The day’s closing gain of +4.61% was substantially higher than the KOSDAQ’s +1.07%. KOSPI closing data for September 7, 2026
The KOSDAQ opened at 822.91 points, traded between an intraday high of 828.85 points and a low of 819.78 points, and closed at 822.19 points. The close was 0.72 points below the open, but was up 8.69 points (+1.07%) from the previous trading day’s close. While both indexes are confirmed to have closed higher on the same trading day, their simultaneous closing movements alone cannot determine the reason for the gains or a causal relationship between the indexes. KOSDAQ closing data for September 7, 2026
SK Hynix and SK Square Post Closing Gains Above 8%, Outpacing the Index
SK Hynix closed at 1,783,000 won on September 7, 2026, up 136,000 won (+8.26%) from the previous trading day. It opened at 1,714,000 won, which was also its intraday low, and finished the regular session at 1,783,000 won, close to its intraday high of 1,785,000 won. Trading volume was 5,583,892 shares. Its closing gain of +8.26% exceeded both the KOSPI’s +4.61% and the KOSDAQ’s +1.07%. Past analysis is available through SK Hynix closing data for September 7, 2026 and the SK Hynix stock hub.
SK Square rose 84,000 won (+8.07%) to 1,125,000 won. It recorded an open of 1,075,000 won, an intraday high of 1,125,000 won, an intraday low of 1,069,000 won, and trading volume of 773,479 shares; its close matched the intraday high. SK Hynix’s +8.26% and SK Square’s +8.07% both exceeded the KOSPI’s gain for the day, but these closing results alone cannot establish a direct causal relationship between the two stocks. See SK Square closing data for September 7, 2026 and the SK Square stock hub.
Samsung Electronics rose 14,500 won (+5.68%) to 270,000 won and closed at its intraday high. Its open was 268,000 won, its intraday low was 263,500 won, and trading volume was 28,023,353 shares. Its +5.68% gain was 1.07 percentage points higher than the KOSPI’s gain. Individual-stock movements are available through Samsung Electronics closing data for September 7, 2026 and the Samsung Electronics stock hub.
Hyundai Motor Rose but Trailed the KOSPI
Hyundai Motor rose 9,500 won (+2.48%) from the previous trading day to 393,000 won on September 7, 2026. It recorded an open of 386,000 won, an intraday high of 395,000 won, an intraday low of 385,500 won, and trading volume of 754,974 shares. While the close was higher than the previous trading day, it fell short of the KOSPI’s +4.61% and the gains of Samsung Electronics, SK Hynix, and SK Square. This is only a relative comparison of closes from the same regular session; the figures alone cannot determine the cause of differences in each stock’s rate of change. Past analysis is available through Hyundai Motor closing data for September 7, 2026 and the Hyundai Motor stock hub.
Separating Flow Figures From Reported Interpretations
Collected investor net-buying and net-selling figures for September 7, 2026 were -68,373억원 for retail investors, +25,525억원 for foreign investors, and +26,496억원 for institutions. On the same trading day, the KOSPI moved +308.18 points (+4.61%) and the KOSDAQ moved +8.69 points (+1.07%). Foreign and institutional net buying and retail net selling are confirmed to have occurred alongside index gains, but these flow figures alone cannot establish that trading by a specific participant drove the direction of the close. Investor flow data for September 7, 2026
Market-preview reports published before the opening cited foreign and institutional buying during the previous trading day and the performance of large semiconductor stocks as factors behind gains in the domestic market, while also mentioning the direction of US interest rates. This is the market interpretation presented in those articles; the September 7, 2026 regular-session closing data itself does not establish that causal relationship. Original market preview article Original opening check article
Three Items to Check in the Next Regular Session
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For the KOSPI, compare the relationship between the September 7, 2026 close of 6,995.39 points and intraday high of 6,995.40 points with the next regular-session close. For the KOSDAQ, compare the relationship between the close of 822.19 points and intraday high of 828.85 points with the next regular-session close.
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For the tracked stocks, check how the September 7, 2026 closing changes of SK Hynix +8.26%, SK Square +8.07%, Samsung Electronics +5.68%, and Hyundai Motor +2.48% differ from index movements in the next regular session.
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Compare investor net buying and net selling of retail investors -68,373억원, foreign investors +25,525억원, and institutions +26,496억원 on September 7, 2026 with the next regular-session figures. It is necessary to view investor flows and closing prices together while avoiding the assumption that simultaneous changes on a single trading day establish causality.