Equity benchmarks the Sensex and the Nifty ended flat on September 11 as gains in shares of TCS, Hindustan Unilever and Infosys were offset by losses in HDFC twins, Bharti Airtel and Asian Paints. The 30-share pack Sensex closed 14 points, or 0.04 percent, up at 38,854.55 with 10 stocks in the green. The Nifty ended 15 points, or 0.13 percent, higher at 11,464.45. BSE midcap and smallcap indices outperformed the benchmark Sensex, closing 0.58 percent and 0.52 percent higher.