The benchmark Korea Composite Stock Price Index inched up 0.71 point, or 0.03 percent, to 2,360.89 as of 11:20 a.m.
On Wednesday (local time), US stocks closed at fresh record highs, with the S&P 500 inching up 0.1 percent and the Dow gaining 0.2 percent.
Most large caps traded mixed, with market kingpin Samsung Electronics adding 0.89 percent and SK hynix, a major chipmaker, advancing 1.06 percent.
The local currency was trading at 1,132.2 won against the US dollar, down 3.7 won from the previous session's close. (Yonhap)