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Organizations involved in this incident2024-10-07Tokyo Sonpo Kantei: ransomware puts customer data of several insurers at riskOpen the incident

6 results

CompanyFinance and insuranceTokyo, Chiyoda[Through a supplier][Critical]
Mitsui Sumitomo Insurance Company, Limited
Incidents 2Latest 2025-11-27Employees 12,731
CompanyFinance and insuranceTokyo, Chiyoda[Breached][Critical]
Tokyo Sonpo Kantei Inc.
Incidents 1Latest 2024-10-07
CompanyFinance and insuranceTokyo, Minato[Through a supplier][Major]
AIG General Insurance Company, Ltd.
Incidents 1Latest 2024-10-07Employees 6,797
CompanyFinance and insuranceTokyo, Shinjuku[Through a supplier][Major]
Sompo Japan Insurance Inc.
Incidents 6Latest 2026-10-05Employees 20,116
CompanyFinance and insuranceTokyo, Chiyoda[Through a supplier][Major]
Tokio Marine & Nichido Fire Insurance Co., Ltd.
Incidents 4Latest 2026-10-21Employees 16,064
CompanyFinance and insuranceTokyo, Chiyoda[Through a supplier][Major]
Nisshin Fire & Marine Insurance Co., Ltd.
Incidents 1Latest 2024-10-07Employees 2,223

	Role
Mitsui Sumitomo Insurance Company, Limited	[Through a supplier]	[Critical]	Company	Finance and insurance	Tokyo, Chiyoda	12,731	–	2	2025-11-27
Tokyo Sonpo Kantei Inc.	[Breached]	[Critical]	Company	Finance and insurance	Tokyo, Chiyoda	–	–	1	2024-10-07
AIG General Insurance Company, Ltd.	[Through a supplier]	[Major]	Company	Finance and insurance	Tokyo, Minato	6,797	–	1	2024-10-07
Sompo Japan Insurance Inc.	[Through a supplier]	[Major]	Company	Finance and insurance	Tokyo, Shinjuku	20,116	–	6	2026-10-05
Tokio Marine & Nichido Fire Insurance Co., Ltd.	[Through a supplier]	[Major]	Company	Finance and insurance	Tokyo, Chiyoda	16,064	–	4	2026-10-21
Nisshin Fire & Marine Insurance Co., Ltd.	[Through a supplier]	[Major]	Company	Finance and insurance	Tokyo, Chiyoda	2,223	–	1	2024-10-07