South Koreans bought mostly Tesla, Apple, and AMC Entertainment among foreign stocks in the first half of the year.
Tesla drew $9.6 billion orders from South Korean investors from January to June, topping the list of actively traded foreign stocks.
Stocks of the US electric vehicle maker worth $7.9 billion were sold to South Korean traders over the period.
As of end-June, Tesla stocks closed at $679.70 each, plummeting nearly 7 percent over the six months.
Apple posted the second-most sales from South Koreans at $3.2 billion in the first half.
Other top purchases by South Koreans were Direxion Daily Semiconductor Bull 3X, theater chain AMC Entertainment, and Churchill Capital IV, a special purpose acquisition company that would merge with electric vehicle maker Lucid Motors.
All top five securities are listed in the US.
South Korean investors bought $103.4 billion of US-listed stocks, accounting for more than 93 percent of the total. The US was followed by Hong Kong, China, and Japan.
The non-US listed stock most bought by South Koreans was Z Holdings, a joint venture of Yahoo and Tokyo Stock Exchange-listed SoftBank.
South Korean investors ordered foreign stocks worth $110.8 billion in the first half, with sales of $96.9 billion, according to data by the Korea Securities Depository.
The size of orders increased rose threefold from the previous year.