Mitsui Sumitomo Insurance Company, Limited ("MSI") was formed in October 2001 through a merger between the former Mitsui Marine & Fire Insurance Co., Ltd. ("Mitsui Marine") and the former Sumitomo Marine & Fire Insurance Co., Ltd. ("Sumitomo Marine").
In April 2008, the entire group transitioned to a holding company structure for the purpose of engaging in more advanced business diversification. In April 2010, the Mitsui Sumitomo Insurance Group, Aioi Insurance Co., Ltd. and Nissay Dowa General Insurance Co., Ltd. merged to form the MS&AD Insurance Group.

  1. 2001October

    Mitsui Sumitomo Insurance Company, Limited ("MSI") established
    Mitsui Sumitomo Kirameki Life Insurance Company, Limited ("Kirameki Life") established

  2. November

    Mitsui Mutual Life Insurance Company (at the time), Sumitomo Life Insurance Company, MSI, and Sumitomo Mitsui Banking Corporation formed a comprehensive alliance covering all aspects of operations

  3. 2002January

    Mitsui Sumitomo Insurance Group Holdings (USA), Inc. established

  4. April

    American Appraisal Japan Co., Ltd. established

  5. September

    Korea Branch of MSI opened in Seoul (the first to be opened by a Japanese non-life insurance company)

  6. October

    Mitsui Sumitomo CitiInsurance Life Insurance Co., Ltd. ("MSI Citi"), a company handling variable annuities, commenced operations

  7. December

    Sumitomo Mitsui Asset Management Company, Limited established (an asset management company jointly established by Mitsui Mutual Life Insurance Company (at the time), Sumitomo Life Insurance Company, MSI, and Sumitomo Mitsui Banking Corporation)

  8. 2003April

    Cholamandalam-MS General Insurance Company Limited established as a joint venture in India

  9. 2004February

    Entered the China market (received authorization for underwriting local policies)

  10. Investment made in Bangkok Life Assurance Ltd. of Thailand, marking MSI's entry into the life insurance business in Asia outside Japan

  11. April

    Investment made in Asia Insurance (Cambodia) Plc., completing MSI's network in ASEAN countries

  12. May

    Operational and capital alliance established with Tokai Tokyo Securities Co., Ltd.

  13. September

    Acquired the Asian non-life insurance business of Aviva plc of the United Kingdom

  14. 2005September

    Acquired Mingtai Fire and Marine Insurance Co., Ltd. (currently MSIG Mingtai Insurance Co., Ltd.) of Taiwan

  15. October

    Mitsui Sumitomo CitiInsurance Life Insurance Co., Ltd. changed its name to Mitsui Sumitomo MetLife Insurance Co., Ltd. ("MSI MetLife") due to a change at the joint venture partner

  16. 2007March

    Mitsui Direct General Insurance Co., Ltd. ("Mitsui Direct") became a subsidiary

  17. 2008April

    Mitsui Sumitomo Insurance Group Holdings, Inc. ("MSIGH") established

  18. July

    MSIGH made Kirameki Life, MSI MetLife, and Mitsui Direct its immediate subsidiaries

  19. 2010April

    Invested in Sinatay Life Insurance Co., Ltd. ; MSI's first foray into the Chinese life insurance market

  20. MS&AD Insurance Group formed as a merger among Mitsui Sumitomo Insurance Group, Aioi Insurance, and Nissay Dowa General Insurance

  21. October

    Entered the Malaysian life insurance market via comprehensive life/non-life partnership with Malaysia's Hong Leong Group

  22. 2011April

    Invested in the Hong Leong Group's takaful business as MSI's first foray into takaful

  23. July

    Invested in Indonesia's Sinarmas Life as MSI's first foray into Indonesian life insurance market

  24. 2012June

    Invested in India's Max New York Life as MSI's first foray into Indian life insurance market

  25. 2013October

    Relocated Head Office to 9, Kanda-Surugadai 3Chome, Chiyoda-ku, Tokyo, Japan

  26. 2015July

    Invested in Sri Lanka's Ceylinco Insurance PLC as MSI's first foray into Sri Lankan life and non-life markets.

  27. 2016February

    Completed the acquisition of UK's Amlin plc.

  28. 2017December

    Completed the acquisition of Singapore's First Capital Insurance Limited