KOSPI Plummets Following Samsung Earnings and Failed Canadian Contract

The Korea Composite Stock Price Index (KOSPI) experienced severe volatility between July 6 and July 7, 2026, culminating in a 4.91 percent plunge to 7,656.31 on Tuesday. The decline followed a session on Monday where the index initially rose 2.45 percent before closing lower as institutional and foreign investors offloaded stocks.

Samsung Electronics triggered a broad market sell-off on Tuesday after reporting a preliminary second-quarter operating profit of 89.4 trillion won. Despite beating market forecasts, the news prompted significant profit-taking, causing Samsung shares to drop 6.92 percent. This downturn extended to other technology leaders; SK hynix shares fell 6.06 percent ahead of a planned $29 billion U.S. listing. The volatility was so acute that the Korea Exchange activated a circuit breaker, suspending trading for 20 minutes after the index dipped more than 8 percent during the session.

Other sectors faced steep losses on Tuesday, with Hyundai Motor Company shares dropping 4.48 percent. Hanwha Ocean saw the most dramatic decline, plummeting 22.65 percent after a South Korean consortium failed to secure a multibillion-dollar submarine procurement project in Canada. Concurrent with the market crash, the Korean won declined against the U.S. dollar, trading at 1,528.20 won per dollar by Tuesday afternoon. This followed a Monday initiative to transition the won to 24-hour trading to attract foreign investors and support a potential MSCI developed-market index upgrade.