South Korean shares rose for a third straight session on Tuesday as investors bought major semiconductor stocks, following an overnight Wall Street rally fueled by renewed optimism over artificial intelligence. The Korea Composite Stock Price Index gained 10.19 points, or 0.15%, to 7,017.91 after reaching as high as 7,171.44. The index opened more than 2% higher but gave up much of those gains as individual and institutional investors sold technology heavyweights.