Disclosure context

About thegentlemen

thegentlemen is a ransomware group that emerged in September 2025, operating with apparent financial motivations based on their broad targeting of commercial sectors. The group has documented 267 victims across multiple countries, with primary focus on the United States, Thailand, France, Brazil, and India. Their targeting strategy demonstrates a preference for high-value sectors including manufacturing, technology, healthcare, and financial services organizations. Given the group's recent emergence and limited public documentation from established threat intelligence sources such as CISA, FBI, or major security research firms, specific details regarding their country of origin, operational structure, attack methodologies, encryption techniques, and whether they employ ransomware-as-a-service models remain unclear. The relatively high victim count of 267 in a short operational timeframe since September 2025 suggests either an aggressive campaign pace or potential inflation of victim numbers through affiliate operations, though without corroborating intelligence reports, the group's exact operational capabilities and notable campaigns cannot be definitively established. Current intelligence indicates the group remains active as of late 2025, though comprehensive threat profiling requires additional validated reporting from authoritative cybersecurity sources. The group has been linked to 424 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post May 18, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

May 6, 2026Marutake listed by thegentlemenon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Agriculture and Food Production sector, which has 536 disclosures indexed across all operators we track. Geographically, Marutake is reported in JP, a country with 88 ransomware disclosures in our corpus.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.

Ransomware victim disclosure

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Marutake

Claimed by thegentlemen · listed 15 days ago

14d

Age

since listed · data leaked

Status timeline

Listed
May 6, 2026
Data leaked

At a glance

Group: thegentlemen
Status: Data leaked
Country: JP
Sector: Agriculture and Food Production
Listed on leak site: May 6, 2026

About the victim

AI dossier — public-source company profile

Marutake Co., Ltd. (株式会社マルタケ) is a comprehensive pharmaceutical and medical wholesale company headquartered in Niigata City, Japan, founded on June 15, 1925. The company distributes prescription pharmaceuticals, medical devices, clinical diagnostic reagents, hygiene materials, nursing care products, and healthcare IT systems to hospitals, clinics, and pharmacies across Niigata, Yamagata, Miyagi, Akita, Tokyo, and Gunma prefectures. With 477 employees and capital of ¥100 million, it operates as a critical intermediary between manufacturers and healthcare providers in the Tohoku/Kanto region.

Industry: Pharmaceutical & Medical Device Wholesale Distribution
Address: 〒950-2092 新潟市西区流通センター4丁目6番地2 (4-6-2 Ryutsu Center, Nishi-ku, Niigata City, Niigata 950-2092, Japan)
Employees: 477
Founded: 1925

Attack summary

Severity: critical — Marutake is a pharmaceutical and medical wholesale distributor handling regulated healthcare supply chain data for hospitals, clinics, and pharmacies. Data published status combined with confirmed operational disruption (system failure notices on the public site) affecting a critical healthcare supply intermediary serving hundreds of medical institutions constitutes a critical-severity incident involving sensitive medical supply chain and potentially patient-adjacent data.

The group 'thegentlemen' claims to have attacked Marutake Co., Ltd. with data published; the company's own website confirms a system failure (システム障害) reported across three notices between April 28 and May 8, 2026, corroborating operational disruption. The disclosed status is 'data_published,' indicating exfiltration and/or publication of company data, though the specific data categories or volume have not been stated in the post.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Company operational data
Pharmaceutical distribution records
Healthcare provider information
Medical device supply chain data
Healthcare IT system data
Employee records (inferred)

What the group claims

kk-marutake.co.jp zoominfo.com/c/marutake/561552308 Marutake Co., Ltd. is a comprehensive pharmaceutical and medical wholesale company founded on June 15, 1925, and headquartered in Niigata City, Japan, with a 100-year history of connecting manufacturers to healthcare providers across the region. The company distributes prescription pharmaceuticals, medical devices, clinical diagnostic reagents, hygiene materials, nursing care products, and healthcare IT systems to hospitals, clinics, and pharmacies, primarily across Niigata, Yamagata, Miyagi, Akita, Tokyo, and Gunma prefectures. With a workforce of 477 employees and capital of ¥100 million, Marutake positions itself as a "supporter of the medical frontline," ensuring stable supply of essential medical commodities to local communities

Sources

Victim sitekk-marutake.co.jp

Source

Indexed 15 days ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.