NTPC, One 97 Communications (PayTM), Amara Raja Batteries, Gati, HeidelbergCement India, Indiabulls Housing Finance, IDFC, Indigo Paints, Indian Railway Finance Corporation, JK Tyre and Industries, CE Info Systems, Metro Brands, Narayana Hrudayalaya, Nuvoco Vistas Corporation, Paras Defence and Space Technologies, Pfizer, SML Isuzu, Sobha, Thermax, and Zydus Lifesciences will report their March quarter earnings on May 20.