Tata Consultancy Services (TCS) is an Indian multinational information technology (IT) services and consulting company headquartered in Mumbai, Maharashtra, India with its largest campus located in Chennai, Tamil Nadu, India. As of February 2021, TCS is the largest IT services company in the world by market capitalisation ($200 billion). It is a subsidiary of the Tata Group and operates in 149 locations across 46 countries.
TCS is the second largest Indian company by market capitalisation and is among the most valuable IT services brands worldwide. In 2015, TCS was ranked 64th overall in the Forbes World`s Most Innovative Companies ranking, making it both the highest-ranked IT services company and the top Indian company. As of 2018, it is ranked eleventh on the Fortune India 500 list. In April 2018, TCS became the first Indian IT company to reach $100 billion in market capitalisation and second Indian company ever (after Reliance Industries achieved it in 2007) after its market capitalisation stood at 6.793 trillion (equivalent to 7.7 trillion or US$100 billion in 2020) on the Bombay Stock Exchange.