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Organizations involved in this incident2025-11-27Shin Nihon Kentei Kyokai: ransomware attackOpen the incident

5 results

CompanyFinance and insuranceTokyo, Shibuya[Through a supplier][Major]
Aioi Nissay Dowa Insurance Co., Ltd.
Incidents 1Latest 2025-11-27Employees 12,515
CompanyFinance and insuranceTokyo, Chiyoda[Through a supplier][Major]
Mitsui Sumitomo Insurance Company, Limited
Incidents 2Latest 2025-11-27Employees 12,731
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
NonprofitOther servicesTokyo, Minato[Breached][Major]
Shin Nihon Kentei Kyokai
Incidents 1Latest 2025-11-27

	Role
Aioi Nissay Dowa Insurance Co., Ltd.	[Through a supplier]	[Major]	Company	Finance and insurance	Tokyo, Shibuya	12,515	–	1	2025-11-27
Mitsui Sumitomo Insurance Company, Limited	[Through a supplier]	[Major]	Company	Finance and insurance	Tokyo, Chiyoda	12,731	–	2	2025-11-27
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
Shin Nihon Kentei Kyokai	[Breached]	[Major]	Nonprofit	Other services	Tokyo, Minato	–	–	1	2025-11-27