In Korea’s regular session on August 28, 2026, the KOSPI fell 1.79% to 6,788.88 points, while the KOSDAQ rose 0.09% to 838.41 points. Among tracked stocks, SK hynix, SK Square, and Samsung Electronics fell by more than the KOSPI, while Hyundai Motor moved in the opposite direction, edging higher on a day when the index declined.
KOSPI Falls to the 6,788 Range After an Intraday High
| Index | August 28, 2026 Regular-Session Close | Change From Previous Trading Day on August 28, 2026 |
|---|---|---|
| KOSPI | 6,788.88 points | -123.49 points(-1.79%) |
| KOSDAQ | 838.41 points | +0.76 points(+0.09%) |
The KOSPI opened at 6,846.54 points on August 28, 2026, reached an intraday high of 6,901.78 points and a low of 6,780.13 points, then closed at 6,788.88 points. The close was 57.66 points below the opening level, 112.90 points below the intraday high, and 8.75 points above the low. KOSPI closing data for August 28, 2026
The KOSDAQ opened at 835.23 points on August 28, 2026, recorded an intraday high of 840.85 points and a low of 829.59 points, then closed at 838.41 points. The close was 3.18 points above the opening level and 2.44 points below the intraday high. The two indexes closed in opposite directions, but this simultaneous movement alone cannot identify causes by sector or investor group. KOSDAQ closing data for August 28, 2026
SK hynix and Samsung Electronics Fall More Than the Index
SK hynix closed at 1,653,000 won on August 28, 2026, down 77,000 won(-4.45%) from the previous trading day. This was a decline 2.66 percentage points larger than the KOSPI’s -1.79% decline on the same trading day. It recorded an opening price of 1,714,000 won, an intraday high of 1,725,000 won, a close matching its intraday low of 1,653,000 won, and trading volume of 4,227,629 shares. Closing data confirm that the close matched the intraday low, but this alone cannot determine the cause of trading near the market close or the direction of the next trading day. Previous analysis is available through SK hynix closing data for August 28, 2026 and the SK hynix stock hub.
Samsung Electronics closed at 257,000 won on August 28, 2026, down 9,000 won(-3.38%) from the previous trading day. This was a decline 1.59 percentage points larger than the KOSPI’s decline. It recorded an opening price of 262,500 won, an intraday high of 266,000 won, an intraday low of 256,000 won, and trading volume of 22,121,817 shares; the close was 5,500 won below the opening price and 1,000 won above the intraday low. Previous analysis records are available through Samsung Electronics closing data for August 28, 2026 and the Samsung Electronics stock hub.
Hyundai Motor Rises While SK Square Falls More Than 3%
Hyundai Motor closed at 399,500 won on August 28, 2026, up 1,500 won(+0.38%) from the previous trading day. It moved in the opposite direction from the KOSPI on a day when the index recorded -1.79%, with a relative price-change gap of 2.17 percentage points versus the KOSPI. It recorded an opening price of 400,000 won, an intraday high of 404,750 won, an intraday low of 397,500 won, and trading volume of 749,521 shares; the close was 500 won below the opening price. This is only a comparison of relative performance based on closing prices and does not indicate a causal relationship between the KOSPI’s decline and Hyundai Motor’s gain. Hyundai Motor closing data for August 28, 2026 and the Hyundai Motor stock hub can be viewed together.
SK Square closed at 1,028,000 won on August 28, 2026, down 40,000 won(-3.75%) from the previous trading day. Its decline was 1.96 percentage points larger than the KOSPI’s on the same trading day, and the close was 46,000 won and 49,000 won below the opening price of 1,074,000 won and the intraday high of 1,077,000 won, respectively. The intraday low was 1,026,000 won, and trading volume was 571,952 shares. Previous analysis of the individual stock is available through SK Square closing data for August 28, 2026 and the SK Square stock hub.
Separate Investor Flows From Interpretations in Pre-Market Reports
Investor-flow figures collected on August 28, 2026, were individuals +4,241억원, foreign investors -17,562억원, and institutions -2,841억원. Based on the signs, individuals were net buyers, while foreign investors and institutions were net sellers. These flow figures and the KOSPI’s decline were results from the same trading day, but the aggregate figures alone cannot establish that trading by a specific investor group caused moves in the index or individual stocks. Investor-flow data for August 28, 2026
The background presented in news reports should be read separately from regular-session closing data. In a pre-market outlook report dated August 28, 2026, Yonhap News identified the Federal Reserve chair’s Jackson Hole speech and developments related to Nvidia as items to watch in its headline. This was the market observation and interpretation presented by that report and cannot be established as the direct cause of the KOSPI’s -1.79% move and declines in semiconductor stocks. Original Yonhap News article
In addition, an Investing.com pre-market report dated August 28, 2026, identified the U.S. stock market and Nvidia’s guidance as matters of focus for the Korean market in its headline. The background explanation in the pre-market report should be distinguished from the regular-session closing result, and one day’s simultaneous movements alone cannot verify the validity of the explanation or a causal relationship. Original Investing.com article
Three Items to Check in the Next Regular Session
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For the next regular-session close, the KOSPI’s August 28, 2026 close of 6,788.88 points and intraday low of 6,780.13 points, as well as the KOSDAQ’s close of 838.41 points and intraday high of 840.85 points, can serve as reference points.
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Among tracked stocks, relative moves of Samsung Electronics -3.38%, SK hynix -4.45%, Hyundai Motor +0.38%, and SK Square -3.75% on August 28, 2026, can be monitored for changes in the next regular session. These are observation reference points only and do not indicate the direction of the next trading day.
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It can be checked whether the investor-flow directions of individuals +4,241억원, foreign investors -17,562억원, and institutions -2,841억원 on August 28, 2026, continue in the next regular-session tally. Investor flows and closing prices can be compared together, but figures from a single trading day alone cannot establish a causal relationship.