Mitsui Sumitomo Insurance Company, Limited (MSI) is a prominent Japanese non-life insurance company and a core entity within MS&AD Insurance Group Holdings, Inc., one of the world's largest general insurance groups. Formed in October 2001 through the merger of Mitsui Marine & Fire Insurance Co., Ltd. (founded 1918) and Sumitomo Marine & Fire Insurance Co., Ltd. (founded 1893), MSI has a rich heritage. The company offers a comprehensive suite of insurance products and risk management services to individual and corporate clients globally. Its offerings include property and casualty insurance, marine insurance, automotive insurance, and various financial services, underpinned by a strong commitment to customer trust, societal well-being, and sustainable growth.
The headquarters in Tokyo serves as the central command for Mitsui Sumitomo Insurance's global strategy formulation, core business operations management, underwriting policy direction, financial stewardship, and overall corporate governance.
Situated in Kanda-Surugadai, a well-established business district in Tokyo, the headquarters building represents a significant corporate presence. While specific architectural awards are not widely publicized, it is expected to be a modern facility designed for operational efficiency and collaboration, reflecting the company's stature.
The work culture at MSI's Tokyo headquarters likely blends traditional Japanese corporate values such as diligence, precision, teamwork, and a profound emphasis on customer service ('omotenashi'), with progressive, global business practices necessary for an international insurance leader.
Tokyo's headquarters is of paramount significance as it anchors MSI's extensive domestic operations within Japan, a major global insurance market. It also orchestrates the company's international business strategies and aligns its activities as a key member of the MS&AD Insurance Group.
Mitsui Sumitomo Insurance Company, Limited, as a cornerstone of the MS&AD Insurance Group, maintains a robust global presence across Asia, Europe, North America, South America, Oceania, and Africa. This extensive network is comprised of direct branches, numerous subsidiary companies (often operating under the MSIG brand), and strategic alliances. Globally, MSI and its affiliates support a wide array of functions including underwriting for diverse non-life insurance products (e.g., marine, fire, casualty, engineering, auto), sophisticated claims management, risk assessment and engineering services, reinsurance operations, and dedicated customer support for both local and multinational corporate clients as well as individual customers in many markets.
9, Kanda-Surugadai 3-chome
Chiyoda-ku, Tokyo
Tokyo
Japan
Address: Ground Floor, Nova South, 160 Victoria Street, London SW1E 5LB, United Kingdom
This office serves as a key hub for MSI in the European market, leveraging London's status as a global insurance and reinsurance center. It provides sophisticated insurance solutions and supports clients with European and international exposures, working closely with the Lloyd's market.
Address: 150 East 42nd Street, New York, NY 10017, U.S.A.
The New York office manages MSI's direct insurance business in the United States, providing crucial access to one of the world's largest and most dynamic insurance markets. It supports clients' North American operations with tailored risk solutions and local expertise.
Address: 38 Cross Street, #03-01 to 04, Singapore 048426 (MSIG Insurance (Singapore) Pte. Ltd., a subsidiary)
Serves as a strategic center for MSI's operations in Southeast Asia, leveraging Singapore's position as a financial hub to drive growth, manage regional risks, and deliver innovative insurance products to a diverse clientele.
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As of April 2025, Mitsui Sumitomo Insurance Group' leadership includes:
Mitsui Sumitomo Insurance Group has been backed by several prominent investors over the years, including:
Significant leadership transitions took place at Mitsui Sumitomo Insurance Company, Limited around April 2023 as part of a broader MS&AD Insurance Group executive reorganization. These changes involved key appointments at the highest levels of the company.
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Mitsui Sumitomo Insurance Company, Limited, as a major global corporation, employs standardized email address formats for its professional communications. While slight variations might exist across departments or regions, common structures typically involve combinations of an employee's first and last name with the company's official domain. The primary domain for international communication is often 'ms-ins.com', while 'ms-ins.co.jp' is used for operations within Japan. Other MSIG-branded entities may use domains like 'msig.com' or country-specific domains (e.g., 'msig.co.uk').
[first].[last]@ms-ins.com or [first_initial][last]@ms-ins.com
Format
taro.sumitomo@ms-ins.com
Example
80%
Success rate
MS&AD Insurance Group Holdings, Inc. Press Release • May 20, 2024
MS&AD Insurance Group, the parent company of Mitsui Sumitomo Insurance, reported strong financial results for the fiscal year ended March 31, 2024. Net income attributable to owners of the parent reached ¥493.1 billion, a significant increase driven by improved underwriting income and investment performance both domestically and internationally....more
Reuters • April 26, 2024
MS&AD Insurance Group Holdings, parent of Mitsui Sumitomo Insurance, along with Sompo Japan Insurance, announced plans to sell their cross-shareholdings in each other. This decision is part of broader measures to enhance corporate governance following a price-fixing scandal involving major Japanese non-life insurers....more
Mitsui Sumitomo Insurance Co., Ltd. Press Release • April 18, 2024
Mitsui Sumitomo Insurance Co., Ltd. (MSI) announced it has entered into a capital and business alliance with HiMarley, Inc., a U.S.-based insurtech company. HiMarley offers an AI-enabled, SMS-based communication platform designed for the insurance industry. This alliance aims to enhance MSI's customer experience, particularly in claims processing and other communication touchpoints....more
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