Reliance Industries, Hindustan Unilever, Bajaj Finserv, HDFC Life Insurance Company, JSW Steel, SBI Life Insurance Company, Ambuja Cements, Hindustan Zinc, Amber Enterprises India, CSB Bank, DLF, Finolex Industries, IDBI Bank, IRB Infrastructure Developers, and United Spirits will be in focus ahead of quarterly earnings on October 21.