During the July 30, 2026 regular session, the KOSPI fell 1.23% and the KOSDAQ dropped 2.70%, failing to recover from the previous trading day’s sharp declines. Among the stocks tracked, SK hynix and SK Square fell 5.64% and 6.00%, respectively, while Samsung Electronics and Hyundai Motor declined less than 1%, highlighting clear differences in losses across individual stocks.

KOSDAQ Decline More Than Double the KOSPI’s

Index July 30, 2026 Close July 30, 2026 Change
KOSPI 5,593.56 points -69.68 points (-1.23%)
KOSDAQ 644.78 points -17.90 points (-2.70%)

The KOSPI closed the July 30, 2026 regular session at 5,593.56 points, down 69.68 points, or 1.23%. On the same trading day, it opened at 5,681.77 points, reached an intraday high of 5,976.82 points and an intraday low of 5,547.41 points. The close was 88.21 points below the opening level and 46.15 points above the intraday low. The difference between the intraday high and low was 429.41 points. KOSPI closing data

The KOSDAQ closed July 30, 2026 at 644.78 points, down 17.90 points, or 2.70%. On the same trading day, it opened at 654.72 points, reached an intraday high of 677.19 points and an intraday low of 642.95 points. The close remained just 1.83 points above the low and was 9.94 points below the opening level. The intraday range, measured as the difference between the high and low, was 34.24 points. KOSDAQ closing data

Based solely on closing data, the KOSDAQ’s decline on July 30, 2026 was 1.47 percentage points greater than the KOSPI’s. The KOSPI closed some distance above its intraday low, while the KOSDAQ finished near its low. This is an editorial interpretation based on the relative positions of the open, high, low and close, and does not identify the cause of the difference in losses between the two markets.

SK Square and SK hynix Fall More Than the Indexes

SK Square closed the July 30, 2026 regular session at 799,000 won, down 51,000 won, or 6.00%. This was the largest percentage decline among the stocks tracked. On the same trading day, it opened at 841,000 won, reached a high of 872,000 won and a low of 770,000 won, with trading volume of 1,695,877 shares. The close was 42,000 won below the opening price and 29,000 won above the intraday low. Its decline was 4.77 percentage points greater than the KOSPI’s and 3.30 percentage points greater than the KOSDAQ’s that day. SK Square closing data Previous stock analysis is available at the SK Square stock hub.

SK hynix closed July 30, 2026 at 1,322,000 won, down 79,000 won, or 5.64%. On the same trading day, it opened at 1,371,000 won, reached an intraday high of 1,459,000 won and an intraday low of 1,287,000 won, with trading volume of 14,193,328 shares. The close was 49,000 won below the opening price and 35,000 won above the low. The difference between the high and low was 172,000 won. SK hynix closing data Its historical performance is available at the SK hynix stock hub.

The fact that both stocks declined by similar amounts is confirmed by the closing data. However, their simultaneous moves alone do not establish that SK hynix’s share price affected SK Square or that a specific industry development caused both stocks to fall.

Samsung Electronics and Hyundai Motor Fall Less Than 1% as Foreign Investors Buy on Net

Samsung Electronics closed the July 30, 2026 regular session at 207,000 won, down 1,500 won, or 0.72%. On the same trading day, it opened at 204,000 won, reached a high of 226,000 won and a low of 202,000 won, with trading volume of 75,207,850 shares. The close was 3,000 won above the opening price but 19,000 won below the high. Samsung Electronics’ decline was 0.51 percentage points smaller than the KOSPI’s and 4.92 percentage points smaller than SK hynix’s. Samsung Electronics closing data Related records are compiled at the Samsung Electronics stock hub.

Hyundai Motor closed July 30, 2026 at 351,000 won, down 2,500 won, or 0.71%. On the same trading day, it opened at 348,000 won, reached a high of 369,000 won and a low of 341,000 won, with trading volume of 1,344,214 shares. The close was 3,000 won above the opening price and 10,000 won above the low. This was the smallest percentage decline among the stocks tracked and was 0.52 percentage points less than the KOSPI’s decline. Hyundai Motor closing data Previous analysis is available at the Hyundai Motor stock hub.

Investor-flow data for July 30, 2026 showed net purchases of 13,427 hundred million won by foreign investors and 660 hundred million won by institutions, while retail investors recorded net sales of 14,311 hundred million won. Combined net purchases by foreign and institutional investors totaled 14,087 hundred million won, 224 hundred million won less than retail investors’ net sales. Investor flow data The fact that foreign net buying and an index decline occurred during the same trading session is confirmed, but trading by any single investor group cannot by itself explain the direction of an index or the extent of an individual stock’s decline.

News reports cited the market environment after two consecutive days of steep declines, with the market continuing to move by around 1–2% on July 30, 2026. The report also said that the Nasdaq had fallen 1.74% in the preceding US session. This was the market context presented by the article and does not mean that US stock-market movements directly caused the Korean market’s closing decline that day. Original Yonhap News report

A separate report on the US market attributed the mixed close in New York on July 28, 2026 local time to a combination of shifting investor sentiment following a decline in international oil prices and a correction in semiconductor stocks. This was also the report’s interpretation and does not provide a basis for determining, from closing data alone, the cause of the Korean market’s or SK hynix’s decline on July 30, 2026. Original report on the New York market

Three Items to Watch in the Next Regular Session

  • It will be important to check whether the KOSPI moves outside the narrow range between its July 30, 2026 close of 5,593.56 points and its intraday low of 5,547.41 points. Because the KOSDAQ’s close of 644.78 points that day was near its intraday low of 642.95 points, another item to monitor is whether the difference in the closing positions of the two indexes continues.

  • Another point to watch is whether SK Square’s 6.00% decline on July 30, 2026 and SK hynix’s 5.64% decline that day narrow toward the indexes’ percentage moves. Whether their gap with Samsung Electronics’ 0.72% decline that day persists is also relevant when comparing volatility across individual stocks.

  • It will be necessary to check whether foreign net purchases of 13,427 hundred million won and institutional net purchases of 660 hundred million won on July 30, 2026 continue during the next regular session, and whether the direction of investor flows and index closing levels diverge again. This is an item for observing the relationship between closing levels and investor flows, not a basis for predicting the next trading day’s direction or recommending trades.