Aon vs Mercer
Updated onCompare Aon and Mercer side-by-side. See how they stack up on features, pricing, and target market.
Aon
Aon plc is a global professional services firm providing risk, retirement and human capital solutions, including insurance brokerage, reinsurance, and consulting.
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Mercer
Mercer is a global professional services firm that provides consulting and solutions in health & benefits, retirement and investments, talent and workforce transformation to help organizations optimize employee outcomes and financial results.
Which should you choose?
Aon
Choose Aon if you want a single global provider that combines large‑scale insurance and reinsurance broking with human capital services such as health & benefits, retirement and talent so that risk and people decisions can be coordinated under one firm.
Mercer
Choose Mercer if your top priorities are employee health & benefits, retirement and investment strategy, and workforce/talent transformation, and you do not need (or already have) a separate property and casualty insurance broker.
Key differences
| Category | Aon | Mercer | Why? |
|---|---|---|---|
| Ideal Client & Use Cases | Given these different emphases, enterprises seeking a unified partner for global insurance broking, reinsurance and risk analytics plus benefits and rewards tend to be better aligned with Aon, whereas organizations whose main needs are health and benefit plan design, retirement and investment strategy, or workforce transformation—especially if they already use another P&C broker—are typically a stronger fit for Mercer. | ||
| Breadth of Risk & Insurance Services | Aon is a global professional services firm whose Risk Capital division makes it one of the world’s largest insurance and reinsurance brokers across industries, whereas Mercer concentrates on employee benefits and HR consulting while most property and casualty insurance brokerage for its clients is handled by sister company Marsh within Marsh McLennan. | ||
| HR / Workforce Transformation & Talent | Mercer’s portfolio prominently features HR transformation, workforce and organization transformation, and talent & rewards solutions (such as job architecture, skills-based talent and global pay transparency), whereas Aon’s human capital practice is more centered on benefits, wellbeing, rewards and analytics, so Mercer usually has the edge for large-scale people and organization change programs. | ||
| Integrated Risk + People Platform | Aon explicitly organizes the firm around “Risk Capital” and “Human Capital” and markets an integrated platform delivering both risk and people solutions through one global team in over 120 countries, while Mercer is the people and investment arm inside Marsh McLennan where risk brokerage primarily sits with Marsh, so clients often engage multiple sister brands rather than a single combined platform. | ||
| Investment & Retirement Advisory Depth | Mercer operates one of the world’s largest institutional investment advisory and OCIO platforms, with over US$300 billion of assets under management and around US$16 trillion under advisement, giving it deeper dedicated pension and wealth management capabilities than Aon’s investment services, which sit within its broader human capital offering. |
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