Aon plc (AON)
Aon plc (AON) is a multinational professional services firm headquartered in London that specializes in risk management, insurance broking, and human capital consulting. Operating across more than 120 countries, Aon serves a broad range of enterprises—from multinational corporations to mid-market companies—helping them navigate complex risks and optimize their workforces.
What the company does
Aon operates across three main business segments. Its Risk Solutions division provides insurance broking, captive management, and risk consulting for corporate clients navigating property, casualty, and specialty insurance needs. The Health Solutions segment focuses on employee benefits consulting, health plan administration, and related services. Its Reinsurance Solutions unit serves as a broker between insurance companies and reinsurers, facilitating the placement of complex reinsurance contracts.
The firm serves a diverse client base including FTSE 100 and Fortune 500 companies, mid-market enterprises, public sector organizations, and not-for-profit institutions. Aon advises clients on everything from workplace safety and liability to employee retirement planning and compensation strategy.
How it makes money
Aon generates revenue primarily through commissions and fees. Insurance broking commissions—earned when Aon places policies with insurers on behalf of clients—form a substantial portion of revenue. Consulting fees for advisory services on risk management, benefits strategy, and organizational design provide a recurring revenue stream. Reinsurance commissions come from placing reinsurance contracts. The firm also earns fees from outsourced benefits administration services and payroll processing solutions.
Revenue is largely recurring due to ongoing client relationships and sticky multi-year contracts in benefits administration and consulting engagements.
Where it sits in its industry
Aon competes in a globally fragmented but increasingly consolidated insurance and professional services landscape. Major competitors include other large broking and consulting firms such as Marsh & McLennan and Willis Towers Watson. Aon distinguishes itself through its scale—operating in 120+ countries—and integrated service offering that spans risk, benefits, and reinsurance under one umbrella.
The insurance broking industry has consolidated significantly over decades through acquisition, and Aon has been both an active acquirer and a target. Its geographic diversification and cross-selling capabilities between divisions provide competitive advantages, though the industry faces ongoing pressure from digital disruption and direct-to-consumer insurance alternatives.
How to research it
Start with Aon’s annual 10-K filing with the SEC (CIK 315293), which details segment performance, client concentration, competitive landscape, and regulatory exposures. Quarterly 10-Q filings track earnings, cash flow, and operational trends throughout the year. Earnings calls with management provide color on market conditions, pricing dynamics, and strategic initiatives.
Industry research from brokerages and consulting firms (including boutiques focused on financial services) regularly covers the insurance broking sector and Aon’s competitive position. Trade publications like Insurance Journal and Best’s Insurance News report on market consolidation, regulatory changes, and client wins or losses.