The S&P BSE Sensex plunged 155.14 points, or 0.41 per cent, to end at 37,869.23, as investors booked profits amid lacklustre global cues. The NSE's Nifty50 index skidded 41.20 points or 0.36 per cent to settle at 11,429.50, snapping it's five-day winning streak.