W.R. Berkley is a holding company for roughly 60 specialty property & casualty insurance and reinsurance businesses. Berkley focuses on commercial insurance for businesses that need coverage for complex, hard-to-place, or specialized risks — exposures that fall outside standard carrier appetite (E&S lines) or require deep industry expertise (specialty lines). Common coverage types include general and professional liability, workers' compensation, commercial auto, property, and specialty lines like cyber, environmental, life sciences, and entertainment. Berkley operates through two segments: Insurance (~88% of net premiums written), covering E&S, industry specialty, product specialty, and regional commercial lines; and Reinsurance & Monoline Excess (~12%), providing treaty and facultative reinsurance plus excess workers' comp. Berkley sells through independent agents, wholesale brokers, and MGAs, with a growing direct-to-customer channel. Like all P&C insurers, Berkley earns underwriting profit when premiums exceed claims and expenses, and investment income on the float. Berkley targets combined ratios in the low 90s and manages a ~$33B investment portfolio, primarily investment-grade fixed income with ~3-year duration. Berkley's growth model is organic — 53 of 60 businesses were built from scratch. Current growth priorities include Berkley One (high-net-worth personal lines, now over $500M in premiums), specialty casualty and E&S liability, and accident & health. Berkley is also investing in AI and automation across underwriting and claims, with meaningful financial returns expected from 2027 onward.