Buying returned to the Pakistan Stock Exchange (PSX) with the US and Iran headed for a third round of nuclear talks, easing concerns about a potential conflict. The benchmark KSE-100 Index gained nearly 500 points during the opening minutes of trading on Monday. At 9:30am, the benchmark index was hovering at 173,640.80, an increase of 471.09 points or 0.27%. Buying interest was observed in k