The Indian stock market traded under pressure on March 26, putting an end to a seven-session gaining spree. Both the headline indices closed flat with a negative bias. The Sensex shed 728.69 points, or 0.93 per cent to close at 77,288.5 levels. The Nifty 50 index also closed lower at 23,486.85 levels, down by 181.8 points, or 0.77 per cent.