The Pakistan Stock Exchange (PSX) opened the week on a bullish note, briefly crossing the 140,000-point mark, but failed to sustain momentum due to profit-taking. The benchmark KSE-100 index closed marginally higher at 139,380.06, gaining 172.77 points or 0.12 per cent on Monday. Ali Najib, Deputy Head of Trading at Arif Habib Ltd, said another attempt by the PSX to break past the 140,000 psy