| Name | Country | Market Cap (US$) |
|---|
| Arch Insurance Group | United States | Private |
| Arch Reinsurance Company | United States | Private |
| Arch Reinsurance Company | United States | Private |
| Arch Reinsurance Ltd | Bermuda | Private |
| Arch Specialty Insurance Company | United States | Private |
| Archer Daniëls Midland Nederland B.V. | Netherlands | Private |
| Archer Group Holdings plc | United Kingdom | Private |
| Architects and Engineers Insurance Company, Incorporated, A RRG | United States | Private |
| Arcos Dorados B.V. | Netherlands | Private |
| Area Life International Assurance Ltd | Republic of Ireland | Private |
| Areas Assurances | France | Private |
| Areas-CMA | France | Private |
| Areas-CMV | France | Private |
| ARECA Insurance Exchange | United States | Private |
| Arel Holding Heiloo B.V. | Netherlands | Private |
| Aresa Seguros Generales, S.A. | Spain | Private |
| Arete Inversiones, S.A. | Spain | Private |
| ARFIN Compagnia di Assicurazioni e Riassicurazioni S.p.A. | Italy | Private |
| Argenia Inc | United States | Private |
| Argenta Assuranties | Belgium | Private |
| Argenta-Life Nederland NV | Netherlands | Private |
| Argentina Salud y Vida Compania de Seguros S.A. | Argentina | Private |
| Argentum Beleggingen B.V. | Netherlands | Private |
| Argo Re Ltd. | Bermuda | Private |
| Argonaut Great Central Insurance Company | United States | Private |
| Argonaut Group, Inc. | United States | Private |
| Argonaut Insurance Company | United States | Private |
| Argonaut Insurance Company Inc | United States | Private |
| Argonaut Insurance Company, Inc | United States | Private |
| Argonaut Insurance Group | United States | Private |
| Argonaut Limited Risk Insurance Company | United States | Private |
| Argonaut-Midwest Insurance Company | United States | Private |
| Argonaut-Southwest Insurance Company | United States | Private |
| Argos Compania Argentina de Seguros Generales S.A. | Argentina | Private |
| Argos Mutual de Seguros del Transporte Publico de Pasajer | Argentina | Private |
| Argosz Biztosito Rt | Hungary | Private |
| ARGOVIE | France | Private |
| Argus Insurance Inc | United States | Private |
| Arheca Holding B.V. | Netherlands | Private |
| ARI Casualty Company | United States | Private |
| ARI Indemnity Company | United States | Private |
| ARI Insurance Group | United States | Private |
| ARI Mutual Insurance Company | United States | Private |
| Arias Acquisitions, Inc. | United States | Private |
| Ariel Holdings Ltd | Bermuda | Private |
| Ariel Investments, LLC | United States | Private |
| Ariel Reinsurance Co Ltd | Bermuda | Private |
| Aries Insurance Company | United States | Private |
| Arig Insurance Company Limited | United Kingdom | Private |
| Arig Reinsurance Co. B.S.C. | Bahrain | Private |
| Arisa Assurances S.A. | Luxembourg | Private |
| ARISA Re S.A. | Luxembourg | Private |
| Aristar Insurance Company | United States | Private |
| Aristo Holding B.V. | Netherlands | Private |
| Arizona Automobile Insurance Company | United States | Private |
| Arizona Home Insurance Company | United States | Private |
| Arizona Physicians Ipa, Inc | United States | Private |
| Ark Life Assurance Co Ltd | Republic of Ireland | Private |
| Arkansas Bankers Life Insurance Company | United States | Private |
| Arkansas Blue Cross Blue Shield, A Mutual Insurance Company | United States | Private |
| Arkansas Community Care, Inc | United States | Private |
| Arkansas Life Insurance Company | United States | Private |
| Arkansas National Life Insurance Company | United States | Private |
| ARKEMA PENSION FUND TRUSTEE CO LTD. | United Kingdom | Private |
| Arkitekternes Pensionskasse | Denmark | Private |
| Arklow Shipping Nederland B.V. | Netherlands | Private |
| Armed Forces Benefit Services Inc | United States | Private |
| Armed Forces Insurance Exchange | United States | Private |
| Armeets, Insurance Company AD | Bulgaria | Private |
| Armor Insurance Company | United States | Private |
| Arnett Hmo Inc | United States | Private |
| Arnhemsche Maatschappij, NV | Netherlands | Private |
| Arnold Suhr Holding B.V. | Netherlands | Private |
| Arnsberg Farmers Mutual Insurance Company | United States | Private |
| Arnside Investment B.V. | Netherlands | Private |
| Aronov Realty Management, Inc. | United States | Private |
| Aros Forsikring - gensidigt forsikringsselskab | Denmark | Private |
| Arriva Beheer N.V. | Netherlands | Private |
| Arrow Mutual Liability Insurance Company | United States | Private |
| Arrow Reinsurance Company, Ltd. | Bermuda | Private |
| Arrowhead General Insurance Agency, Inc. | United States | Private |
| Arrowood Indemnity Company | United States | Private |
| Arrowood Surplus Lines Insurance Company | United States | Private |
| Arroyo Insurance Services Inc | United States | Private |
| Ars Holding B.V. | Netherlands | Private |
| Arta Medicare Health Plan, Inc. | United States | Private |
| Artas N.V. | Belgium | Private |
| Arthur J Gallagher & Co | United States | Private |
| Arthur J Gallagher Risk Mgt Services Inc | United States | Private |
| Arthur J Glatfelter Agency Inc | United States | Private |
| Arthur J. Gallagher & Co. | United States | Private |
| Arthur J. Gallagher & Co. | United States | Private |
| Arthur J. Gallagher & Co. of Florida, Inc. | United States | Private |
| Arthur J. Gallagher (UK) Ltd | United Kingdom | Private |
| Arthur J. Gallagher Risk Management Service Inc | United States | Private |
| Arthur J. Gallagher Risk Management Services | United States | Private |
| Arthur J. Gallagher Risk Managment Services, Inc. | United States | Private |
| Arthur og Hubert Müllers Fond | Denmark | Private |
| Artisan & Truckers Casualty Company | United States | Private |
| Artisana | Switzerland | Private |
|
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