Massive buying was observed at the Pakistan Stock Exchange (PSX), with the benchmark KSE-100 Index gaining nearly 4,400 points during the opening minutes of trading on Monday, as investors rejoiced over the peace deal between the United States and Iran. At 9:35am, the benchmark index was hovering at 176,767.01, up by 4,367.11 points or 2.53%. Across-the-board buying was seen in key sectors,