Positive sentiments returned to the Pakistan Stock Exchange (PSX), with the benchmark KSE-100 index gaining nearly 300 points during the opening minutes of trading on Thursday. At 9:45am, the benchmark index was hovering at 166,416.18, an increase of 270.84 points or 0.16 percent. Across-the-board buying was observed in key sectors, including commercial banks, cement, fertilizer, oil and gas