After a brief positive start, profit-taking returned to the Pakistan Stock Exchange (PSX) with the benchmark KSE-100 Index shedding over 800 points during intra-day trading on Tuesday. At 10:25am, the benchmark index was hovering at 166,914.96, an increase of 837.44 points or 0.5%. Selling pressure was observed in key sectors including cement, commercial banks, fertiliser, oil and gas explor