Mitsui Sumitomo Insurance Group

Mitsui Sumitomo Insurance Group Holdings, Inc. (三井住友海上グループホールディングス株式会社) is a Japanese insurance holding company headquartered in Tokyo, Japan.

MSIG was formed in 2001 from the merger of Mitsui Marine & Fire Insurance Co. (itself descended from the Taishō Marine and Fire Insurance Co. founded in 1918) and The Sumitomo Marine & Fire Insurance. In 2010 April Aioi Insurance Co., Ltd., Nissay Dowa General Insurance Co., Ltd., merged into MSIG, making the group's name changed in to MS&AD Insurance Group Holdings, Inc.. According to this business integration, MS&AD has become the largest property insurance company in Japan, with market share of 33% in 2013.

On 8 September 2015, it was announced that Mitsui Sumitomo had agreed to buy the UK Insurance firm Amlin for £3.5bn

Non-life insurance

 * Mitsui Sumitomo Insurance Co., Ltd.

Life insurance

 * Mitsui Sumitomo Kirameki Life Insurance Co., Ltd.
 * Mitsui Sumitomo MetLife insurance Co., Ltd.

Companies not based in Japan

 * Amlin, plc
 * MSIG Insurance Europe AG
 * MS Frontier Reinsurance Ltd.
 * Mitsui Sumitomo Reinsurance Ltd.
 * Mitsui Sumitomo Insurance London Management Ltd.
 * MSI GuaranteedWeather, LLC
 * part,llc
 * Mitsui Sumitomo Insurance – Oceania

Financial services

 * Sumitomo Mitsui Asset Management Co., Ltd.
 * MITSUI SUMITOMO INSURANCE Venture Capital Co., Ltd.

Risk-related businesses

 * InterRisk Research Institute & Consulting, Inc.
 * MITSUI SUMITOMO INSURANCE Care Network Co., Ltd.
 * American Appraisal Japan Co., Ltd.

Annual Reports

 * MSIG Annual Report 2008
 * MSIG Annual Report 2014