Nihon Kotsu Co., Ltd. Listed by AiLock Ransomware Group: What Was Exposed & What To Do
Nihon Kotsu Co., Ltd. was listed by the AiLock ransomware group on July 15, 2026, after internal files were exfiltrated in a ransomware attack. Individuals connected to the company should check whether their information was involved and take protective steps.
Breaking down the breach
The only confirmed public information is the listing itself, reported on July 15, 2026. The group states that internal files were removed; no independent confirmation of the claim, the attack date, or the quantity of data has been made available. The number of people whose information may be involved is not disclosed.
Who is AiLock?
AiLock is a ransomware group that publishes victim names on a leak site when it claims to have carried out an attack. The group’s listing of Nihon Kotsu constitutes an unverified claim by the actor; no additional statements or evidence specific to this incident have been released by AiLock beyond the site entry.
Who is Nihon Kotsu Co., Ltd.?
Nihon Kotsu Co., Ltd. is Japan’s largest taxi and limousine operator. For the fiscal year ending May 2025 the company recorded consolidated revenue of ¥103.445 billion, with group and partner sales reaching ¥155.457 billion. Organisations of this scale maintain extensive records on vehicle operations, driver schedules, customer bookings, and corporate administration.
What was likely exposed
The listing refers only to “internal files exfiltrated in ransomware attack.” No specific categories of data have been named. Companies in the taxi and limousine sector routinely hold operational logs, contract details, employee records, and customer booking information; however, the precise contents of the material claimed by the group remain unconfirmed.
The real-world impact
Exposure of internal operational files can create follow-on risks for both individuals and the organisation, including potential misuse of scheduling or contact data and added costs for investigation and remediation. Because the scale of exposure is unknown, the extent of any downstream effects on customers or staff cannot yet be assessed.
Were you affected?
Individuals who have used Nihon Kotsu services may wish to monitor their email and financial accounts for unusual activity and to enable multi-factor authentication where available. A free exposure scan of an email address against known breach data can provide an initial indication of whether personal information has appeared in previously published datasets.
AICompiled with AI assistance from public sources and published under our editorial standards.
How this breach connects
More recent breaches
Solid Advance Inc. Listed by AiLock Ransomware GroupFerrovial Listed by AiLock Ransomware GroupPanasonicAero Listed by coinbasecartel Ransomware GroupWBF Construction Listed by AiLock Ransomware GroupLatest breaches
Read GalaxyWarden’s full analysis of the Nihon Kotsu Co., Ltd. Listed by AiLock Ransomware Group →
Publicly posted by ailock — unverified claim, pending independent verification
Breach listings — particularly those originating from ransomware or leak sites — are third-party claims that may be unverified, incomplete, or inaccurate. A listing does not by itself confirm that a breach occurred or that any specific data was exposed. Severity is an automated assessment, not a definitive rating. Verification status is shown where available.
Attributions to threat groups and methods reflect public reporting and, in some cases, unverified claims made by the groups themselves; they may be incomplete or later revised. Recent Breaches and GalaxyWarden are independent and are not affiliated with, and do not endorse, any company or group named on this page. This information is aggregated from public sources for awareness only and is not legal, security, or investment advice.