Tata Consultancy Services Limited (TCS) is an Indian multinationalinformation technology (IT) service, consulting and business solutions company headquartered in Mumbai, Maharashtra.^[4][5] It is a subsidiary of the Tata Group and operates in 46 countries.^[6]TCS is one of the largest Indian companies by market capitalization ($80 billion).^[7][8] TCS is now placed among the ‘Big 4’ most valuable IT services brands worldwide.^[9] In 2015, TCS is ranked 64th overall in the Forbes World's Most Innovative Companies ranking, making it both the highest-ranked IT services company and the first Indian company.^[10] It is the world's 10th largest IT services provider, measured by the revenues.^[11] As of December 2015, it is ranked 10th on the Fortune India 500 list