SAO PAULO (Reuters) -Payments company Cielo said on Monday a trio of Brazilian firms including its controlling shareholders had launched a tender offer to take it private in a deal that could be worth up to 5.90 billion reais ($1.18 billion). Lenders Bradesco and Banco do Brasil, which together hold almost 60% of Cielo, are making the offer together with their shared holding company, Grupo Elopar. The offer would be at 5.35 reais per share, a 6.4% premium from Monday's closing price, Banco do Brasil and Bradesco said in separate filings.