 Cannae Holdings, Inc. NYSE:CNNE Cannae today announced that Black Knight, Inc. Black Knight, a leading provider of integrated software, data and analytics to the mortgage and real estate industries, has entered into a definitive equity purchase agreement with affiliates of private equity firm GTCR, LLC, to purchase Optimal Blue, a leading provider of secondary market solutions and actionable data services, for an enterprise value of 1.8 billion, subject to customary purchase price adjustments. 