In South Korea’s regular trading session on August 4, 2026, the KOSDAQ surged 5.88%, far outpacing the KOSPI’s 1.62% gain. Among the stocks tracked, SK Square rose 3.41%, while Samsung Electronics and SK Hynix each gained less than 1%. Hyundai Motor fell 0.13%, closing in the opposite direction from the indexes.

KOSDAQ Closes at 780.72 Points, Rising More Than Three Times as Much as the KOSPI

Index August 4, 2026 Close August 4, 2026 Change
KOSPI 6,358.95 points +101.50 points (+1.62%)
KOSDAQ 780.72 points +43.37 points (+5.88%)

The KOSPI closed the regular session from 09:00 to 15:30 on August 4, 2026, at 6,358.95 points, up 101.50 points, or 1.62%, from the previous trading day. It opened at 6,351.38 points, reached a regular-session high of 6,389.40 points and fell to a low of 6,080.25 points. The close was 7.57 points above the open and 278.70 points above the low, but 30.45 points below the high. The spread between the regular-session high and low was 309.15 points on August 4, 2026. KOSPI closing data

The KOSDAQ closed the regular session on August 4, 2026, at 780.72 points, up 43.37 points, or 5.88%, from the previous trading day. Both the open and low were 748.19 points, while the high was 780.85 points. The close was 32.53 points above the open and just 0.13 points below the regular-session high. KOSDAQ closing data

The difference between the two indexes’ gains on August 4, 2026, was 4.26 percentage points. The KOSDAQ’s close near its intraday high, while the KOSPI closed between its intraday high and low, supports the editorial interpretation that the KOSDAQ showed stronger closing momentum. However, this price structure alone does not explain what drove the gains in the two markets.

SK Square Rises 3.41%, While Two Semiconductor Stocks Post Limited Rebounds

SK Square closed the regular session on August 4, 2026, at 1,060,000 won, up 35,000 won, or 3.41%, from the previous trading day. It opened at 1,052,000 won, reached a high of 1,096,000 won and fell to a low of 999,000 won, with trading volume of 1,295,094 shares. The close was 8,000 won above the open, and SK Square recorded the largest gain among the stocks tracked. SK Square closing data Historical coverage of the stock is available on the SK Square stock hub.

Samsung Electronics closed the regular session on August 4, 2026, at 240,000 won, up 500 won, or 0.21%, from the previous trading day. It opened at 239,000 won, reached a high of 246,500 won and fell to a low of 227,500 won, with trading volume of 49,120,872 shares. The close was 1,000 won above the open, but the stock’s gain was 1.41 percentage points below the KOSPI’s and 5.67 percentage points below the KOSDAQ’s. Samsung Electronics closing data Previous analysis is available on the Samsung Electronics stock hub.

SK Hynix closed the regular session on August 4, 2026, at 1,577,000 won, up 10,000 won, or 0.64%, from the previous trading day. It opened at 1,580,000 won, reached a high of 1,630,000 won and fell to a low of 1,483,000 won, with trading volume of 8,462,948 shares. The close was 3,000 won below the open, and its gain was 0.98 percentage points smaller than the KOSPI’s. SK Hynix closing data Previous analysis of the stock is available on the SK Hynix stock hub.

SK Square and the two semiconductor stocks all closed higher on August 4, 2026, but their simultaneous gains alone are not enough to conclude that a common factor determined their prices. What the closing data directly show is that SK Square’s gain was 3.20 percentage points larger than Samsung Electronics’ and 2.77 percentage points larger than SK Hynix’s.

Hyundai Motor Falls 0.13%, Diverging From the Rising Indexes

Hyundai Motor closed the regular session on August 4, 2026, at 392,500 won, down 500 won, or 0.13%, from the previous trading day. It opened at 390,000 won, reached a high of 402,500 won and fell to a low of 376,000 won, with trading volume of 1,093,620 shares. Although the close was 2,500 won above the open, its direction relative to the previous trading day’s close differed from that of the KOSPI, the KOSDAQ and the other stocks tracked. Hyundai Motor closing data Historical analysis is available on the Hyundai Motor stock hub.

The difference between Hyundai Motor’s and the KOSPI’s returns on August 4, 2026, was 1.75 percentage points, while the difference between Hyundai Motor and the KOSDAQ was 6.01 percentage points. This is an editorial interpretation comparing relative closing performance against the market. It is not evidence that Hyundai Motor faced a separate negative factor or an explanation of why it did not participate in the indexes’ gains.

Individuals Post Net Purchases as Foreign and Institutional Investors Sell

By investor type on August 4, 2026, individuals recorded net purchases of 8,185 hundred million won, while foreign investors recorded net sales of 3,706 hundred million won and institutional investors recorded net sales of 5,394 hundred million won. It is confirmed that the net selling by foreign and institutional investors and the net buying by individuals occurred on the same trading day as the KOSPI’s 1.62% gain. However, these figures alone are not enough to conclude that a specific investor category produced the KOSPI’s 101.50-point gain or the KOSDAQ’s 43.37-point gain. Investor trading-flow data

A Yonhap News report published before the market opened on August 4, 2026, presented US stock-market trends and falling oil prices as background for assessing a potential rebound attempt by the South Korean market. The same report noted a 2.00% gain in the MSCI South Korea ETF and a 1.05% rise in the Philadelphia Semiconductor Index. However, these figures described conditions in overseas markets before the domestic session and do not establish the cause of the gains at the South Korean regular-session close. Original Yonhap News market-view report

Infostock Daily’s market-opening review on August 4, 2026, also cited easing US-Iran tensions and a sharp drop in international oil prices as overseas-market background. However, the article was published before the market opened, and its discussion of domestic investor flows and indexes covered the previous trading day. It therefore should not be interpreted as identifying either the direct cause of the August 4, 2026, regular-session close at 15:30 or that day’s final investor flows. Original Infostock Daily article

Three Items to Watch in the Next Regular Session

  • It will be important to see whether the KOSDAQ again closes near its August 4, 2026, close of 780.72 points and regular-session high of 780.85 points in the next regular session. For the KOSPI, the comparison will be how the 4.26-percentage-point performance gap with the KOSDAQ changes relative to its August 4, 2026, close of 6,358.95 points.

  • It will be important to watch whether the gap between SK Square’s 3.41% gain on August 4, 2026, and Samsung Electronics’ and SK Hynix’s gains of 0.21% and 0.64% on the same trading day widens or narrows at the next regular-session close. Another item to monitor is whether Hyundai Motor continues to move in the opposite direction from the market relative to its August 4, 2026, close of 392,500 won and decline of 0.13%.

  • The direction of individuals’ net purchases of 8,185 hundred million won, foreign investors’ net sales of 3,706 hundred million won and institutional investors’ net sales of 5,394 hundred million won on August 4, 2026, should be compared with the next regular-session close. This is not a basis for predicting the next trading day’s direction or recommending purchases, but a checkpoint for reviewing the relationship between prices and investor flows after the fact.