"Soared Right After Opening" Samsung Electronics and SK hynix Jump Over 20%, KOSPI Surges 15%

Foreign Investors Purchase 5 Trillion Won
KOSDAQ Also Rises 9%

With semiconductor-related stocks such as Samsung Electronics and SK hynix rising, the KOSPI index also surged by 15%. The KOSDAQ rose by 9% as well.

As of 9:58 a.m. on July 31, the KOSPI index was trading at 6,467.94, up 874.38 points (15.63%) from the previous trading day. The KOSPI opened at 5,657.79, up 64.23 points from the previous session, and as the sharp rally continued, a buy sidecar was triggered. At around 9:06 a.m., due to volatility in the KOSPI 200 futures index, program buy orders were suspended for 5 minutes on the KOSPI market. At the time the sidecar was triggered, the KOSPI 200 futures index had surged 129.90 points (14.97%) to 997.50 from the previous closing price. Just one second after the sidecar was activated on the KOSPI market, a buy sidecar was also triggered on the KOSDAQ market.

Net buying by foreign investors is driving the sharp rise in the index. Foreign investors purchased stocks amounting to 5.1693 trillion won. In contrast, individual investors and institutions were net sellers of 4.8464 trillion won and 238.8 billion won, respectively.

The KOSPI index opened at 5681.77, up 18.53 points from the previous trading day, displayed on the electronic board showing the domestic stock market status at the dealing room of Hana Bank headquarters in Jung-gu, Seoul on the 30th. 2026.7.30 Photo by Jinhyung Kang

By sector, the electrical and electronics category, including semiconductors, jumped by 24.66%. Medical and precision instruments (14.55%), machinery and equipment (11.28%), distribution (11.08%), and construction (9.53%) sectors also rose. On the other hand, food & beverages and tobacco (-3.44%) and pharmaceuticals (-2.28%) declined.

Among top-cap stocks, SK Square and Samsung Electro-Mechanics each jumped 29.9%. SK hynix (28.6%) and Samsung Electronics (24.6%) also surged. Doosan (27.5%), Hanmi Semiconductor (26.1%), Hyosung Heavy Industries (24.9%), LS ELECTRIC (22.2%), and SK Inc. (21.8%) also posted gains. Conversely, SK Innovation fell by 7.2%, while Samsung Biologics (-3.2%), KT&G (-3%), and Meritz Financial Group (-2.8%) also declined.

At the same time, the KOSDAQ index rebounded to the 700-point level, rising 57.54 points (8.92%) from the previous trading day to 702.32. The KOSDAQ also opened strong at 666.47, up 21.69 points from the previous session, and continued to gain. Foreign investors and institutions recorded net purchases of 80.2 billion won and 85.9 billion won, respectively, while individuals were net sellers of 166.1 billion won.

Among the top market cap KOSDAQ stocks, Tes jumped 30%, while TSE (29.9%), Simmtech (29.9%), VM (29.8%), Jusung Engineering (27.1%), PSK (27%), and Techwing (26.9%) also soared. In contrast, Pharmaresearch fell by 4.6%.

This content was produced with the assistance of AI translation services.