Company

Nikkei Inc.

Nikkei Inc. (Chiyoda, Tokyo; Information and communications) appears in 4 related cybersecurity incidents. The latest was disclosed on 2026-10-16.

Profile

Industry/type

Information and communications

Location

Tokyo, Chiyoda

Website

https://www.nikkei.co.jp/

Group companies

Metric	Value		As of	Source
Employees	2,700	Non-consolidated	2025-12-31	METI: Gビズインフォ
Users and members	1,062,666		2026-01-01	Nikkei: 日経朝刊・電子版の購読数 231万
Revenue	¥177.7B	Non-consolidated	2025-12-31	METI: Gビズインフォ
Capital	¥2.5B	Non-consolidated	2025-12-31	METI: Gビズインフォ

		Incident	Role	Impact level				Methods	Impacts		Status
2026-10-16	2026-10-22	Nikkei: unauthorized access to the cloud service it uses for system development	[Breached]	[Critical]	[Critical]	1 Nikkei Inc.	Tokyo	[Credential abuse]	[Data leak]	1,830,000	[Investigating]
2026-10-04	2026-10-22	Nikkei: unauthorized logins to an employee's Google Workspace account	[Breached]	[Major]	[Major]	1 Nikkei Inc.	Tokyo	[Credential abuse]	[Data leak]	1,646	[Contained]
2026-10-04	2026-10-22	Nikkei: Microsoft 365 account taken over and used for phishing emails	[Breached]	[Major]	[Major]	2 Nikkei Inc., Nikkei Business Publications, Inc.	Tokyo	[Credential abuse][Phishing]	[Data leak]	Unknown	[Contained]
2025-11-04	2026-10-23	Nikkei: unauthorized access to its Slack	[Breached]	[Major]	[Major]	1 Nikkei Inc.	Tokyo	[Malware][Credential abuse]	[Data leak]	17,368	[Contained]