QCC’s expanded US analysis, using the updated NAIC cyber supplement data, highlights divergent strategies among leading carriers. Hartford Steam Boiler led the endorsements segment with $75 million in premium and a 26% share. In the primary market, Chubb heads the top five carriers, which collectively hold 30% of market share, while the surplus lines segment is led by Starr, with the top five carriers controlling 26%. Some insurers, such as Arch, spread exposure across multiple segments, while others, including At-Bay in primary and Fairfax in surplus, focus on narrower plays.