Marutake Listed by thegentlemen Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

Marutake Co., Ltd. was listed by the ransomware group thegentlemen on or around May 6, 2026. The listing states that internal files were exfiltrated during a ransomware attack. The number of individuals whose information may be involved remains unknown, and no further details on the scope or confirmation of the incident have been made public. The practical stakes center on the nature of the data held by a regional pharmaceutical and medical wholesale company. Records in this sector can include information tied to hospitals, clinics, and pharmacies, which may affect supply chains and patient care if exposed.

Inside the incident

The only confirmed public information is the listing itself. The group claims internal files were taken in a ransomware operation. No date of the intrusion, volume of data, or method of access has been disclosed. It is not known whether the files were published or whether any ransom demand was met.

The group behind it: thegentlemen

Thegentlemen is a ransomware operator that maintains a leak site to list organizations it claims to have targeted. Such groups typically gain initial access through phishing, exposed remote services, or compromised credentials, then deploy encryption while copying data for leverage. Prior public reporting has associated the group with similar listings against other victims, though each claim requires independent verification.

Who is Marutake?

Marutake Co., Ltd. is a pharmaceutical and medical wholesale company founded in 1925 and based in Niigata City, Japan. It supplies prescription pharmaceuticals, medical devices, diagnostic reagents, hygiene products, nursing care items, and healthcare IT systems to hospitals, clinics, and pharmacies across several prefectures including Niigata, Yamagata, Miyagi, Akita, Tokyo, and Gunma. Its role places it in the middle of regional healthcare supply chains.

What was likely exposed

The listing refers only to “internal files exfiltrated in ransomware attack.” No inventory of specific file types or data categories has been released. Organizations of this kind routinely hold procurement records, customer and supplier details, inventory data, and internal communications. The exact contents remain unconfirmed.

The real-world impact

Exposure of internal files could reveal operational details about medical product distribution, potentially affecting hospitals and pharmacies that rely on timely deliveries. For individuals, any personal or health-related information contained in those files could increase risks of targeted fraud or misuse. The organization faces possible disruption to its systems and reputational consequences while the accuracy of the group’s claims is assessed.

Were you affected?

Begin by monitoring official statements from Marutake or relevant Japanese authorities for any confirmed guidance. Individuals can also run a free exposure scan of their email address against known breach data sets to check for prior appearances of their information. If contact details or account credentials surface, change passwords and enable multi-factor authentication on associated services.

AICompiled with AI assistance from public sources and published under our editorial standards.