Mitsui Sumitomo Insurance Group

Corporate Name Mitsui Sumitomo Insurance Company, Limited
Establishment Date 21 October 1918
Paid-in Capital 139,595 million yen (as at 31 March 2026)
Number of Employees 12,741 (non – consolidated basis as at 31 March 2026)
Head Office 9, Kanda-Surugadai, 3 Chrome, Chiyoda-ku, Tokyo, Japan
Insurer Financial Strength Rating In New Zealand, the Insurance (Prudential Supervision) Act 2010 requires licensed insurers to have a current financial strength rating that is given by an approved rating agency.

Financial Strength Rating is an independent opinion of an insurer’s financial strength and ability to meet its ongoing insurance policy and contract obligations.

Mitsui Sumitomo Insurance Company, Limited has a Financial Strength Rating of A+ (Stable) given by A.M. Best and A+ (Stable) given by Standard and Poor’s.

A.M. Best’s Financial Strength Rating Scale is:

A+ Superior
A Excellent
B+ Good
B Fair
C+ Marginal
C Weak
D Poor

Standard and Poor’s Financial Strength Rating Scale is:

AAA Extremely Strong
AA Very Strong
A Strong
BBB Good
BB Marginal
B Weak
CCC Very Weak
CC Extremely Weak
R Under Regulatory Supervision
SD Selective Default
D Default
NR Not rated

The rating scales may be modified by the addition of a plus (+) or minus (-) sign to show relative standing within the major rating categories.

 

MS&AD Group Credit Ratings The latest credit rating of MS & AD group
Solvency Disclosure (New Zealand)

The solvency of Mitsui Sumitomo Insurance Company, Limited expressed in JPY millions and its solvency ratio calculated on the Japanese regulatory basis at each reporting date were:

(JPY millions)

Mar 31, 2026 Sep 30, 2025 Mar 31, 2025
Actual Solvency Capital (A) 3,618,430 3,819,798 3,593,924
Minimum Required Solvency Capital (B) 1,993,396 1,016,635 1,017,541
Minimum Required Solvency Ratio 100% 200% 200%
Solvency Margin [(A)-(B)] 1,625,034 2,803,163 2,576,383
Solvency Ratio
[(A)/(B)] x 100%
181.5% 751.4% 706.3%
(2025: [(A)/{(B) x 1/2}] x 100%)

The solvency of Mitsui Sumitomo Insurance Company, Limited expressed in NZD millions and its solvency ratio calculated based on the requirements of the Reserve Bank of New Zealand at each reporting date were:

(NZD millions)

Mar 31, 2026 Sep 30, 2025 Mar 31, 2025
Actual Solvency Capital (A) 39,547 44,398 42,162
Minimum Required Solvency Capital (B) 21,787 11,817 11,937
Solvency Margin [(A)-(B)] 17,760 32,582 30,225
Solvency Ratio
[(A)/(B)] x 100%
181.5% 375.7% 353.2%

Effective 31 March 2026, Mitsui Sumitomo Insurance Company, Limited adopted Japan’s Economic Value-Based Solvency Regime (ESR), replacing the previous Solvency Margin Ratio (SMR) framework. The ESR framework assesses assets and liabilities on an economic value basis and applies more comprehensive and risk-sensitive capital requirements, including a higher confidence level and broader risk coverage. As a result, solvency ratios reported under ESR are not directly comparable with historical SMR ratios and are generally lower than those reported under the previous framework. The ESR supervisory benchmark is 100%, compared with 200% under the former SMR framework, and the change in reported solvency ratios reflects the revised regulatory methodology rather than a reduction in the capital strength.

Solvency Disclosure (Australia)

Mitsui Sumitomo Insurance Company, Limited Australia Branch (“MSI Australia”) is a branch of Mitsui Sumitomo Insurance Company, Limited, incorporated in Japan.

MSI Australia is authorised by the Australian Prudential Regulation Authority (APRA) to carry on general insurance business in Australia as a Category C Insurer.

The information below has been derived from MSI Australia’s APRA regulatory returns as at 31 March 2026 and 31 March 2025.

Capital Adequacy Position

(AUD millions)

Mar 31, 2026 Mar 31, 2025
Adjusted Net Assets in Australia 224,382 211,427
    Insurance Risk Charge
12,081 7,964
    Insurance Concentration Risk Charge
22,646 16,580
    Asset Risk Charge
64,192 62,737
    Operational Risk Charge
14,739 9,208
    Less: Aggregation Benefit
-20,063 -15,488
Prescribed Capital Amount 93,595 81,001
Capital Adequacy Multiple 239.7% 261.0%

MSI Australia maintained Adjusted Net Assets in Australia of $224.4 million at 31 March 2026 (2025: $211.4 million), compared with a Prescribed Capital Amount of $93.6 million (2025: $81.0 million). The Capital Adequacy Multiple of 239.7% (2025: 261.0%) indicates that MSI Australia maintained capital resources substantially above APRA’s prescribed capital requirement throughout the reporting period.

MS & AD Insurance Group Holdings, Inc.

MS&AD Holdings is a listed holding company with five directly invested Group insurance companies in Japan: Mitsui Sumitomo Insurance Co., Ltd. (MSI), Aioi Nissay Dowa Insurance Co., Ltd. (ADI), Mitsui Direct General Insurance Co., Ltd. (Mitsui Direct), Mitsui Sumitomo Aioi Life Insurance Co., Ltd. (MSI Aioi Life) and Mitsui Sumitomo Primary Life Insurance Co., Ltd. (MSI Primary Life); and eight affiliated operating companies: MS&AD InterRisk Research Institute & Consulting, Inc., MS&AD Business Support Co., Ltd., MS&AD Staffing Service Co., Ltd., MS&AD Systems Co., Ltd., MS&AD Business Service Co., Ltd., MS&AD GRAND ASSISTANCE Co., Ltd., MS&AD ABILITYWORKS Co., Ltd., and MS&AD VENTURES INC.

Contact to MSI