Aon plc (AON)

Aon plc is a leading global professional services firm delivering Risk Capital and Human Capital solutions to clients in over 120 countries across nearly every industry, leveraging data, analytics, and its "Aon United" strategy to help organizations navigate complex risk and workforce challenges. In 2024, the company reported consolidated total revenue of $15,698 million, comprising $10,517 million from Risk Capital and $5,209 million from Human Capital (before intercompany eliminations); beginning in Q4 2024, Aon shifted from a single reportable segment to these two segments to better reflect internal management and resource allocation. Risk Capital encompasses Commercial Risk Solutions (insurance/specialty brokerage, risk consulting, captives management, and Affinity programs organized by industry and product lines such as property, casualty, cyber, and construction) and Reinsurance Solutions (treaty and facultative reinsurance, strategic and technology consulting via tools like Tyche and ReMetrica, and capital markets/investment banking services including insurance-linked securities and M&A advisory).

Human Capital includes Health Solutions (health and benefits consulting/brokerage, consumer benefits platforms, and talent advisory covering workforce assessment, compensation, and ESG consulting) and Wealth Solutions (retirement consulting, pension administration, and investment advisory services including delegated investment management). The company generates revenue primarily through commissions, fees, and compensation from insurers/reinsurers, with earnings concentrated in the first and fourth quarters due to industry buying patterns; it also holds client funds in trust accounts, segregated from operating capital. Aon operates in a highly competitive, fragmented market, competing with major brokers like Marsh & McLennan, Willis Towers Watson, Arthur J. Gallagher, and Lockton, as well as direct-writing insurers and specialized consulting firms; no single client exceeded 1% of 2024 revenue, and no insurance carrier represented more than 10% of placed premiums, reflecting a diversified customer and carrier base.

The firm operates under extensive licensing and regulatory oversight globally, including U.S. federal/state agencies, the U.K. FCA, SEC, DOL, and FINRA, governing insurance brokerage, investment advisory, broker-dealer activities (via subsidiary Aon Securities LLC), and fiduciary fund management. As of December 31, 2024, Aon employed approximately 60,000 people worldwide, emphasizing an Inclusive People Leadership strategy, employee training and development, competitive total rewards, and diversity initiatives—its global workforce was 54% women, with a U.S. workforce that was 25% racially or ethnically diverse. The company also runs apprenticeship programs in the U.S. and U.K., having hired 802 apprentices since inception, and maintains transparency through SEC filings and governance materials accessible via its investor relations website.