Buying returned to the Pakistan Stock Exchange (PSX), with the benchmark KSE-100 Index gaining nearly 1,000 points during the opening minutes of trading on Thursday. At 9:45am, the benchmark index was hovering at 171,181.56, up by 990.92 points or 0.58%. Buying was observed in key sectors, including automobile assemblers, cement, commercial banks, fertilizer, oil and gas exploration companie