Ryan Specialty, an international specialty insurance firm, agreed to acquire Castel Underwriting Agencies, a managing general underwriting platform, from Arch, a global financial services company. Financial terms were not disclosed. “Castel is a first-class organization with a history of exceptional performance on all metrics, including underwriting profit and growth. Bringing Castel into Ryan Specialty expands our UK and European footprint in delegated authority, and the lines of business underwritten by these MGUs are both complementary and accretive to our firm. We are very much looking forward to further expanding with this very talented team,” Patrick G. Ryan, Founder, Ryan Specialty Chairman and CEO.