Mumbai: Taking a cue from global markets, the key Indian equity market indices opened flat on Friday. The Sensitive Index (Sensex) of the BSE, which had closed at 27,774.88 points on Wednesday, opened higher at 27,805.94. Minutes into trading, it was quoting at 27,723.11 points, down 51.77 points, or 0.19 per cent. At the National Stock Exchange (NSE), the broader 51-scrip Nifyy, which had closed at 8,575.30 points, was trading at 8,562.60 points, down 12.70 points or 0.15 per cent. On Wednesday, the Sensex was down 310.28 points at the closing but it touched a high of 28,143.28 points and a low of 27,736.62 points during the intra-day trade. The Nifty too fell by 102.95 points. Profit booking, along with negative global cues and caution over upcoming quarterly results, dragged the Indian equity markets lower on Wednesday. Asian markets showed a mixed trading cue on Thursday after the US stocks incurred losses on account of falling oil prices. Hang Seng was up by 0.07 per cent while Kospi was quoting at 0.42 per cent lower. Shanghai Composite was trading in green, up 0.16 per cent.