Buyout firms including CVC Capital Partners and KKR are considering bids for Toshiba, people familiar with the matter said, after the Japanese conglomerate said it would open the door to potential buyers. Suitors have been holding high-level discussions with Toshiba and its advisers, the people said. Bain Capital has also been studying a potential deal. Toshiba’s buyout, which has a market capitalisation of almost $18 billion, would possibly be private equity’s biggest ever deal in the country.