South Korean stocks closed a tad higher Friday to extend their winning streak to a fourth session to a new record high as investors scooped of artificial intelligence (AI) shares despite concerns over a bubble. The local currency fell against the greenback. The benchmark Korea Composite Stock Price Index (KOSPI) inched up 3.11 points, or 0.06 percent, to close at 5,224.3, after rising as high as to 5,321.68. Trade volume was heavy at 852 million shares worth 34.7 trillion won (US$24.1 billion).