Gains in index heavyweights such as Bharti Airtel Ltd, Infosys Ltd, Tata Consultancy Services Ltd (TCS), HCLTechnologies Ltd, ITC Ltd, Sun Pharmaceutical Industries Ltd, ICICI Bank Ltd, Tech Mahindra Ltd, Hindustan Unilever Ltd (HUL) and Kotak Mahindra Bank Ltd supported the benchmarks, helping them move into positive territory after a weak start.