Indian equity benchmark indices, BSE Sensex and NSE Nifty50, may start today's trading session on a weak note following the downtrend in SGX Nifty50 futures. The contract was down 0.6 percent at 17,429.5 as of Shares of Vedanta, Lupin, Hero MotoCorp, Ruchi Soya Industries, Sterlite Technologies and Future Retail among others will be closely tracked today.