The document ranks the 100 largest U.S. brokerage firms by their 2015 revenue, with Marsh & McLennan Companies at the top, generating over $6.3 billion. Notable increases include Willis Towers Watson, which saw a 129.7% rise, and Acrisure with a 114.7% increase. Overall, the report reveals varying degrees of revenue growth across the firms listed, reflecting the competitive landscape of the brokerage industry.