LONDON--(BUSINESS WIRE)--A.M. Best has commented that the financial strength rating of A- (Excellent) and the issuer credit ratings of “a-” of Seguros Catalana Occidente, S.A. de Seguros y Reaseguros (SCO) and its wholly owned subsidiary, Bilbao, Compañía Anónima de Seguros y Reaseguros, S.A. (SB), are unchanged following the announcement on 29 May 2015 that SCO will acquire the remaining 51% of Plus Ultra Seguros Generales y Vida S.A. de Seguros y Reaseguros (Plus Ultra) from its ultimate majo