 PEMBROKE, Bermuda--BUSINESS WIRE--Arch Capital Group Ltd. ArchNASDAQ: ACGL, along with investment partners Kelso Company Kelso and Warburg Pincus, today announced the completion of the previously disclosed acquisition of Watford Holdings Ltd. Watford. Watford and Arch originally announced the signing of a definitive merger agreement on Nov. 2, 2020, through an affiliated entity of which Arch owns approximately 40, and funds managed by Kelso and Warburg Pincus each own approxi 