Bharti will invest an additional $500 million (over Rs 3,700 crore) into OneWeb, to become the largest shareholder in the satellite communications company that billionaire Sunil Mittal-run Bharti Group along with the UK government had rescued from bankruptcy last year. The investment is a result of exercise of a 'call option' by Bharti. On completion of the transaction and with Eutelsat's $550 million investment, Bharti will hold 38.6 per cent. The UK government, Eutelsat and SoftBank will each own 19.3 per cent, OneWeb said in a statement.