Company

Seiyu Co., Ltd.

Seiyu Co., Ltd. (Musashino, Tokyo; Wholesale and retail trade) appears in 1 related cybersecurity incident. The latest was disclosed on 2025-10-30.

Profile

Metric	Value	Scope	As of	Source
Employees	28,434	Non-consolidated	2024-06-12	METI: Gビズインフォ

		Incident	Role	Impact level				Methods	Impacts		Status
2025-10-30	2025-11-17 08:05	Seiyu: an attack on the shift scheduling tool of US vendor Blue Yonder leaked employee IDs, names and birth dates of 30,508 current and former staff	[Through a supplier]	[Major]	[Major]	1 Seiyu Co., Ltd.	Tokyo	[Intrusion]	[Data leak]	30,508	[Contained]