The stock markets opened Monday’s session on a negative note, with S&P BSE Sensex dipping 56.31 points. BSE Sensex tumbled 0.16 per cent and opened at 35,633.29. The Nifty50 index fell 17.25 points or 0.16 per cent and opened at 10,807. Domestic indices were down in early trade due to passive global cues. Asian shares also started on a cautious note on Monday on escalating trade tensions between the United States and major economies. Oil prices gave up some of their hefty gains made after major oil producers agreed to a modest increase in production.