| Name | Country | Market Cap (US$) |
|---|
| AOMORIKEN MUTUAL AID ASSOCIATION | Japan | Private |
| AON ADJUDICATION SERVICES LTD | United Kingdom | Private |
| AON ALEXANDER HOWDEN LTD | United Kingdom | Private |
| Aon Belgium SA | Belgium | Private |
| AON CONSEIL ET COURTAGE | France | Private |
| Aon Consulting & Insurance Services | United States | Private |
| AON CONSULTING LTD | United Kingdom | Private |
| Aon Consulting Worldwide, Inc | United States | Private |
| Aon Finance N.S.1 ULC | Canada | Private |
| AON FORFAITING LTD | United Kingdom | Private |
| Aon France S.A. | France | Private |
| AON GIL Y CARVAJAL CORREDURIA DE SEGUROS SA | Spain | Private |
| Aon Group Ltd. | United Kingdom | Private |
| Aon Group, Inc | United States | Private |
| Aon Jauch & Hübener GmbH | Germany | Private |
| AON Limited | United Kingdom | Private |
| Aon Ltd | United Kingdom | Private |
| AON Market Services Pty. Ltd. | Australia | Private |
| Aon Portugal - Corretores de Seguros, S.A. | Portugal | Private |
| Aon Re (Thailand) Ltd | Thailand | Private |
| Aon Re Global Fac | United States | Private |
| Aon Re Inc | United States | Private |
| Aon Re, Inc. | United States | Private |
| AON Reed Stenhouse Inc | Canada | Private |
| AON RISK RESOURCES LTD | United Kingdom | Private |
| Aon Risk Services Agente de Seguros y de Fianzas, S.A. de C.V. | Mexico | Private |
| Aon Risk Services Inc of Northern California Insurance Services | United States | Private |
| Aon Risk Services Ltd | United Kingdom | Private |
| Aon Risk Services New Zealand Limited | New Zealand | Private |
| Aon Risk Services of Texas, Inc | United States | Private |
| AON RISK SERVICES U K LTD | United Kingdom | Private |
| Aon Risk Services, Inc. Of Florida | United States | Private |
| Aon Risk Services, Inc. of the Carolinas | United States | Private |
| Aon Risk Services, Inc. Of Utah | United States | Private |
| Aon Select, Inc | United States | Private |
| AON SERVICES GROUP LTD | United Kingdom | Private |
| Aon Services Inc | United States | Private |
| AON SPA INSURANCE & REINSURANCE BROKERS | Italy | Private |
| Aon Specialty Re | United States | Private |
| AP Skadeforsikring Aktieselskab | Denmark | Private |
| APCapital Group | United States | Private |
| Apex Lloyds Insurance Company | United States | Private |
| APK-Pensionskasse AG | Austria | Private |
| Apocalipsis Funerarios Reunidos, S.A. de Seguros | Spain | Private |
| Apollo Casualty Company | United States | Private |
| Apollo Mutual Fire Insurance Company | United States | Private |
| Apoteket ABs Pensionsstiftelse | Sweden | Private |
| Appalachian Insurance Company | United States | Private |
| Appenzeller Versicherungen | Switzerland | Private |
| Appleclaim Ltd | United Kingdom | Private |
| Appliance Manufacturers Assurance Company Risk Retention Group | United States | Private |
| Applied Medico-Legal Solutions Risk Retention Group, Inc | United States | Private |
| Applied Underwriters, Inc. | United States | Private |
| APRA | Belgium | Private |
| APRA Leven n.v. | Belgium | Private |
| APRA Ongevallen n.v. | Belgium | Private |
| April Assurances | France | Private |
| APRIL SOLUTIONS | France | Private |
| APS CHEMICALS SUPERANNUATION PTY LIMITED | Australia | Private |
| APS Financial Corporation | United States | Private |
| APS Seguradora S.A. | Brazil | Private |
| APSpecialty Insurance Corporation | United States | Private |
| Apulia Assicurazioni Spa | Italy | Private |
| Apulia Previdenza Spa | Italy | Private |
| AquaGuardian Insurance Company, Inc. | United States | Private |
| Aquilo plc | United Kingdom | Private |
| Ara Casualty Insurance Co | United States | Private |
| ARA Casualty Insurance Company | United States | Private |
| Arab Investment and Export Credit Guarantee Corporation, The | Kuwait | Private |
| Arab Misr Insurance Group | Egypt | Private |
| Arab Reinsurance Company S.A.L. | Lebanon | Private |
| ARAG | Belgium | Private |
| ARAG Allgemeine Rechtsschutz-Versicherungs-Aktiengesellschaft | Germany | Private |
| ARAG Allgemeine Rechtsschutzvers. AG | Switzerland | Private |
| Arag Allgemeine Versicherungs-Ag | Germany | Private |
| ARAG Assicurazioni S.p.a. | Italy | Private |
| Arag Insurance Company Inc | United States | Private |
| Arag Krankenversicherungs-Ag | Germany | Private |
| Arag Lebensversicherungs-Ag | Germany | Private |
| ARAG Osterreich Allgemeine Rechtsschutzversicherings-AG | Austria | Private |
| ARAG, Compania Internacional de Seguros y Reaseguros, S.A. | Spain | Private |
| Arag-Nederland Algemene Rechtsbijstand Verzekeringmaatschappij | Netherlands | Private |
| ARB International Limited | United Kingdom | Private |
| Arbejdsmarkedets Tillægspension | Denmark | Private |
| Arbella Indemnity Insurance Company | United States | Private |
| Arbella Insurance Group | United States | Private |
| Arbella Protection Insurance Company, Inc | United States | Private |
| Arbetsmarknads Försäkringsaktiebolag | Sweden | Private |
| Arbor Casualty & Property Ireland Limited | Republic of Ireland | Private |
| ARC ACCIDENT REPORTING CENTRE PTE LTD | Singapore | Private |
| Arc Excess & Surplus Llc | United States | Private |
| ARC MidAtlantic Excess & Surplus, Inc. | United States | Private |
| Arca Assicurazioni S.p.A. | Italy | Private |
| ARCA PATRIMOINE | France | Private |
| Arca Vita International Limited | Republic of Ireland | Private |
| Arca Vita S.P.A. | Italy | Private |
| Arcadian Health Plan of Georgia, Inc | United States | Private |
| Arcadian Health Plan of Louisiana Inc | United States | Private |
| Arcadian Health Plan of NC, Inc | United States | Private |
| Arcalis | France | Private |
|
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