Seoul shares closed nearly unchanged on Monday as investors took profits amid heightened uncertainties.

The benchmark Korea Composite Stock Price Index(KOSPI) fell six-point-22 points, or zero-point-16 percent, to close at three-thousand-920-point-37.

Turnover was light at 293-point-seven million shares worth eleven-point-69 trillion won, or seven-point-95 billion U.S. dollars, with gainers outnumbering losers 489 to 380.

The main bourse opened higher, tracking overnight U.S. gains as Wall Street extended its winning streak to a fifth day.

Heavy institutional selling later trimmed the KOSPI's early gains.

Most large caps ended mixed.

Samsung Electronics rose zero-point-three percent to 100-thousand-800 won, and SK hynix advanced one-point-51 percent to 538-thousand won.

LG Energy Solution and Samsung Biologics added one-point-23 and two-point-61 percent, respectively.

In contrast, defense giant Hanwha Aerospace lost four-point-58 percent, and automaker Hyundai Motor dropped two-point-68 percent.

The tech-heavy KOSDAQ rose nine-point-71 points, or one-point-06 percent, to close at 922-point-38.

The South Korean won strengthened against the U.S. dollar by zero-point-seven won, trading at one-thousand-469-point-nine won as of 3:30 p.m.