Cobalt parts with CEO; Faraday US cat departures; Mango leaves Guy Carpenter; BP Marsh backs Ruggieri start-up; Willis Re chief risk officer leaves; CTMA's Schirmer to leave; Arch Re Canada head; R&Q in $46.5mn LPT; Scor enters US medical market; Ogden to cost £3.5bn; Allstate cat losses; Mark Boleat knighted; Sure raises $8mn; UPC exhausts cat retention; Pipoly stays at AmTrust; FCA rebukes Admiral; CBL Insurance backs MGA; Lightning losses climb; CNA creates MGA unit