In the regular Korean trading session (09:00–15:30) on September 8, 2026, the KOSPI fell 40.87 points (-0.58%) from the previous trading day to 6,954.52 points, while the KOSDAQ declined 10.31 points (-1.25%) to 811.88 points. Although the indexes ended lower, SK hynix and SK Square, among the tracked stocks, rose 0.56% and 0.53%, respectively, showing closing moves that differed from the indexes.

Index September 8, 2026 regular-session close Change from previous trading day September 8, 2026 intraday high · low
KOSPI 6,954.52 points -40.87 points (-0.58%) 7,171.52 points · 6,951.78 points
KOSDAQ 811.88 points -10.31 points (-1.25%) 830.21 points · 811.88 points

KOSPI closes lower after reaching 7,171.52 points intraday

The KOSPI opened at 7,045.79 points on September 8, 2026, climbed as high as 7,171.52 points during the session, and closed the regular session at 6,954.52 points. Its intraday low was 6,951.78 points, placing the close 2.74 points above the low. The intraday high and closing level clearly differed substantially, but these figures alone cannot identify intraday trading participants or the cause of the pullback. KOSPI closing data

The KOSDAQ opened at 825.03 points on September 8, 2026, rose to 830.21 points intraday, and closed at 811.88 points. Both its intraday low and closing level were 811.88 points, and its -1.25% decline from the previous trading day was larger than the KOSPI’s -0.58% decline. This is a relative result from comparing the two regular-session closes; closing data alone cannot establish why the indexes recorded different rates of change. KOSDAQ closing data

Semiconductor tracking stocks close differently from the indexes

SK hynix closed at 1,793,000원 on September 8, 2026, up 10,000원 (+0.56%) from the previous trading day. It opened at 1,785,000원, reached an intraday high of 1,889,000원 and a low of 1,773,000원, and traded 6,788,348 shares. It is possible to compare its gain with the declines in both the KOSPI and KOSDAQ, but that comparison alone does not explain what caused its move in the opposite direction from the indexes. Historical analysis is available through SK hynix closing data and the SK hynix stock hub.

SK Square rose 6,000원 (+0.53%) to 1,131,000원 on September 8, 2026. It recorded an opening price of 1,124,000원, an intraday high of 1,199,000원, an intraday low of 1,111,000원, and trading volume of 862,990 shares. SK hynix’s +0.56% and SK Square’s +0.53% were same-day closing results that contrasted with the KOSPI’s -0.58% and the KOSDAQ’s -1.25%. See SK Square closing data and the SK Square stock hub.

Samsung Electronics fell 500원 (-0.19%) to 269,500원 on September 8, 2026. It recorded an opening price of 270,000원, an intraday high of 279,000원, an intraday low of 267,500원, and trading volume of 34,830,542 shares; its same-day decline was smaller than the KOSPI’s -0.58%. Previous analysis of the stock is available through Samsung Electronics closing data and the Samsung Electronics stock hub.

Hyundai Motor closed at 385,000원 on September 8, 2026, down 8,000원 (-2.04%). It recorded an opening price of 393,000원, an intraday high of 394,000원, an intraday low of 384,000원, and trading volume of 810,286 shares. Its -2.04% decline was larger than the declines in both the KOSPI and KOSDAQ on the same trading day. See Hyundai Motor closing data and the Hyundai Motor stock hub for continuing coverage.

Separating investor-flow figures from article interpretations

The collected investor net-trading tally for September 8, 2026, showed individuals at -30,332억원, foreign investors at +6,316억원, and institutions at +6,427억원. These investor-flow figures and the KOSPI’s -0.58% and KOSDAQ’s -1.25% closing declines were facts observed on the same trading day, but net buying and selling alone cannot establish that a specific investor group determined the indexes’ closing levels. September 8, 2026 investor-flow data

A pre-market Market View report by Yonhap News presented the continued impact of positive Astra news and profit-taking selling following the previous trading day’s sharp rise as possible factors that could affect the day’s KOSPI. This was the report’s expectation and market interpretation; September 8, 2026 closing data do not prove a causal relationship for that explanation. Original Market View article

Another pre-market report presented semiconductor-related expectations in its headline and market context, while a morning brief described expectations for AI memory demand as background for large-cap semiconductor stocks. However, the same-day closing combination of gains in SK hynix and SK Square and declines in Samsung Electronics and the indexes cannot by itself verify this interpretation or establish it as a direct cause. Original opening-check article Original morning brief article

Three items to check in the next regular session

  • For the KOSPI, the September 8, 2026 close of 6,954.52 points can be compared with the next regular-session close in terms of its position between that day’s intraday high of 7,171.52 points and low of 6,951.78 points.

  • For tracked stocks, the September 8, 2026 closing changes—SK hynix +0.56%, SK Square +0.53%, Samsung Electronics -0.19%, and Hyundai Motor -2.04%—can be compared with the next regular session’s index moves.

  • Investor net trading on September 8, 2026—individuals -30,332억원, foreign investors +6,316억원, and institutions +6,427억원—can be compared with the next regular-session tally. Investor flows and closing levels can be reviewed together, while maintaining a standard that does not treat simultaneous changes on a single trading day as a causal relationship.