01 Tata Consultancy Services ( TCS )

One of the world ’ s ‘ Big Four ’ IT services companies , Tata Consultancy Services ( TCS ) accounts for as much as 70 percent of Tata Sons ’ revenues . With a whopping 67 subsidiary companies , TCS has a range of technological capabilities which include building and maintaining applications , engineering , business consulting and outsourcing , as well as IT infrastructure and asset leveraging . With well over 370,000 employees in 46 countries , TCS is a truly global employer , partnering with a number of leading universities at home and abroad , particularly in the US .