The trade war between the United States and China, now in its seventh month, has dealt a blow to South Korean stocks.
The country's main index, the KOSPI, lost nearly 7 percent of its value from late March until last Friday.
Among markets of the G20 countries, it ranked 16th in terms of performance.
Korean companies rely heavily on trade with both China and the U.S., so it was inevitable that they would be affected by the tit-for-tat tariffs between them.
Foreigners sold shares worth more than 3 billion dollars.
Of those, more than 1-point-4 billion were shares of market leader Samsung Electronics... whose price as a result fell almost 8-and-a-half percent.