Holding company
- MS&AD Insurance Group Holdings, Inc.
Domestic insurance companies
- Mitsui Sumitomo Insurance Co., Ltd.
- Aioi Nissay Dowa Insurance Co., Ltd.
- Mitsui Direct General Insurance Co., Ltd.
- Mitsui Sumitomo Aioi Life Insurance Co., Ltd.
- Mitsui Sumitomo Primary Life Insurance Co., Ltd.
Affiliated companies
- MS&AD InterRisk Research & Consulting, Inc.
- MS&AD Loan Service Co., Ltd.
- Aioi Nissay Dowa Claims Adjusting Company, Limited
- Aioi Nissay Dowa Insurance Service Co., Ltd.
- Aioi Nissay Dowa Automobile Research Center Company, Limited
- Fure-Ai Do Life Services Co., Ltd.
- Little Family SS Insurance Co.,Ltd
- Mitsui Sumitomo Insurance Care Network.,Inc.
- MS&AD Business Support Co., Ltd.
- MSK Anshin-Station Company, Limited
- MITSUI SUMITOMO INSURANCE Venture Capital Co.,Ltd.
- MS&AD Staffing Service Co., Ltd.
- MS&AD ABILITYWORKS Co., Ltd.
- MS&AD GRAND ASSISTANCE Co., Ltd.
Overseas insurance companies and reinsurance companies, etc.
- MSIG Asia Pte. Ltd.
- MSIG Insurance (Singapore) Pte. Ltd.
- PT. Asuransi MSIG Indonesia
- Asia Insurance (Cambodia) Plc.
- Mitsui Sumitomo Insurance (China) Company Limited
- MSIG Insurance (Hong Kong) Limited
- MSIG Insurance (Malaysia) Bhd.
- MSIG Insurance (Thailand) Public Company Limited
- MSI Holding (Thailand) Company Limited
- Calm Sea Service Company Limited
- MSIG Service and Adjusting (Thailand) Company Limited
- MSIG Berhad
- Ueang Mai Co., Ltd.
- Yardhimar Company Limited
- MBTS Broking Services Company Limited
- BPI/MS Insurance Corporation
- MSIG Insurance (Vietnam) Company Limited
- Cholamandalam MS General Insurance Company Limited
- Cholamandalam MS Risk Services Limited
- MSIG Mingtai Insurance Co., Ltd.
- MSIG Insurance (Lao) Co., Ltd.
- National Insurance Company Berhad
- MSIG Holdings (U.S.A.), Inc.
- Mitsui Sumitomo Marine Management (U.S.A.), Inc.
- Mitsui Sumitomo Insurance USA Inc.
- Mitsui Sumitomo Insurance Company of America
- MSIG Specialty Insurance USA Inc.
- Seven Hills Insurance Agency, LLC
- Mitsui Sumitomo Seguros S/A.
- Mitsui Sumitomo Insurance Company Limited-Escritório de Representação no Brasil Ltda.
- Lifson Re Ltd.
- SPAC Insurance (Bermuda) Limited
- Aioi Nissay Dowa Insurance Company of Europe SE
- Toyota Insurance Management SE
- Aioi Nissay Dowa Insurance Management Limited
- Aioi Nissay Dowa Life Insurance of Europe AG
- DTRIC Insurance Company, Limited
- DTRIC Insurance Underwriters, Limited
- DTRIC Management Company, Limited
- Aioi Bangkok Insurance Public Company Limited
- Bangkok Chayoratn Company, Limited
- Bangkok Chayolife Company, Limited
- Aioi Nissay Dowa Management New Zealand Limited
- Aioi Nissay Dowa Insurance Company Australia Pty Ltd
- Aioi Nissay Dowa Insurance (China) Company Limited
- Guang Ai Insurance Brokers Ltd.
- LLC Toyota Insurance Management (Insurance Brokers)
- LLC Toyota Insurance Management (Insurance Agency)
- Toyota Insurance Management (Insurance Broker) LLP
- Box Innovation Group Limited
- Insure The Box Limited
- ITB Services Limited
- ITB Web Limited
- ITB Telematics Solutions LLP
- ITB Premium Finance Limited
- MS Financial Reinsurance Limited
- Interisk Asia Pte Ltd
- InterRisk Consulting (Shanghai) Co., Ltd
- InterRisk Asia (Thailand) Company Limited
- MSI GuaranteedWeather, LLC
- MSI GuaranteedWeather Trading Limited
- Vortex Insurance Agency, LLC
- PT. Asuransi Jiwa Sinarmas MSIG Tbk
- Hong Leong Assurance Berhad
- Hong Leong MSIG Takaful Berhad
- Max Life Insurance Co. Ltd.
- Bangkok Life Assurance PCL
- Ceylinco Insurance PLC
- MS Amlin Corporate Services Limited
- Leadenhall Capital Partners LLP
- Leadenhall Capital Partners US LLC
- Leadenhall Capital Partners US LP
- Leadenhall Capital Bermuda Limited
- MS Amlin Underwriting Limited
- MS Amlin Corporate Member Limited
- Amlin UK Limited
- MS Amlin Reinsurance Managers, Inc.
- MS Amlin (India) Private Limited
- MSI Corporate Capital Limited
- Old Amlipden Company 12 Limited
- MS Amlin Underwriting Services Limited
- MS Amlin Holdings Limited
- MS Amlin Investments Limited
- Amlin France Legacy Services
- MS Amlin Asia Pacific Pte. Ltd.
- MS Amlin Labuan Limited
- MS Amlin Investment Holdings Limited
- MS Amlin Investment Management Limited
- MS Amlin (MENA) Limited
- Amlin Netherlands Holding B.V.
- MS Amlin Marine N.V.
- MS Amlin AG
- MS Amlin Insurance SE
- SHUS Holdings Ltd
- MS Amlin Distribution Holdings INC.
- International Transportation & Marine Office, LLC
- International Transportation & Marine Agency, LLC
- Associated MG, LLC
- Mitsui Sumitomo Insurance Company (Europe), Limited
- MSIG Corporate Services (Europe) Limited
- MSIG German Services GmbH
- MSIG Insurance Europe AG
- Aioi Nissay Dowa Insurance Services USA Corporation
- Advanced Connectivity, LLC
- Connected Analytic Services, LLC
- Toyota Insurance Management Solutions USA, LLC
- MS First Capital Insurance Limited
- MOTER Technologies, Inc.
- Aioi Nissay Dowa Services Asia Pte. Ltd.
- Aioi Nissay Dowa Europe Limited
- Aioi Nissay Dowa Insurance UK Limited
- Toyota Insurance Management South Africa Proprietary Limited
- KBZ MS General Insurance Company Limited
- MSIG Management (Shanghai) Co., Limited
- MSR Capital Partners, LLC