<Tr> <Th> Key people </Th> <Td> Natarajan Chandrasekaran (Chairman) </Td> </Tr> <Tr> <Th> Website </Th> <Td> www.tata.com </Td> </Tr> <P> Tata Sons Limited is the holding company of the Tata Group and holds the bulk of shareholding in these companies . It was established as a trading enterprise in 1868 . About 86% of the equity capital of Tata Sons is held by philanthropic trusts endowed by members of the Tata family . The biggest two of these trusts are the Sir Dorabji Tata Trust and Sir Ratan Tata Trust . Tata Sons is the owner of the Tata name and the Tata trademarks, which are registered in India and several other countries . TCS alone generates 70% revenues of its parent company, Tata Sons . Natarajan Chandrasekaran took over as Chairman of Tata Sons on 21 February 2017 . </P> <P> The company is registered and located in Mumbai, India . </P>

Who become the chairmen of tata sons in 2017