Thomson Reuters is in advanced discussions for a sale of part of its financial and risk business, its largest unit by revenues, to US private equity firm Blackstone. The company confirmed in a statement on Tuesday that it was considering a sale of a stake in the business to Blackstone but would retain an interest in the unit. It will also retain full ownership of Reuters News and its legal, tax and accounting businesses. The talks with Blackstone were for a 55 per cent stake in the financial and risk business, valuing the unit at C$20bn ($16.17bn), a person with knowledge of the matter said.