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 12, 2026Amstel Securities listed by thegentlemenon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Financial Services sector, which has 516 disclosures indexed across all operators we track. Geographically, Amstel Securities is reported in NL, a country with 24 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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Amstel Securities

Claimed by thegentlemen · listed 8 days ago

Age

since listed · data leaked

Status timeline

Listed
May 12, 2026
Data leaked

At a glance

Group: thegentlemen
Status: Data leaked
Country: NL
Sector: Financial Services
Listed on leak site: May 12, 2026

About the victim

AI dossier — public-source company profile

Amstel Securities is an independent brokerage firm founded in 1989, specializing in fixed income, equities, and derivatives with a focus on Southeast Asian domestic currency bonds, high-yield credit, and G7 markets. The firm operates as an agency and matched-principal broker serving institutional clients including wealth managers, family offices, and accredited investors worldwide. It maintains clearing and custody partnerships with BNY Mellon's Pershing and connects Asian and global markets.

Industry: Institutional Brokerage & Fixed Income Securities
Founded: 1989

Attack summary

Severity: critical — Amstel Securities operates in regulated financial services, handling institutional client data, investment portfolios, and financial transaction records for wealth managers, family offices, and accredited investors. Data publication by the threat actor in this sector typically involves regulated financial PII and confidential investment data at scale, warranting a critical classification.

The group 'thegentlemen' claims to have compromised Amstel Securities and has published data, though no ransom amount or explicit data volume was stated. The disclosed status indicates data has been published, suggesting exfiltration of business and potentially client-related information.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Client account records
Institutional investor data
Trade execution records
Internal business documents
Partnership/counterparty communications

What the group claims

amstelsecurities.com zoominfo.com/c/amstel-securities-llp/353641962 Amstel Securities is a premier independent brokerage firm founded in 1989, connecting Asian and global markets with 35+ years of expertise in fixed income, equities, and derivatives. As a trusted agency and matched-principal broker, they specialize in Southeast Asian domestic currency bonds, high-yield credit, and G7 markets, serving institutional clients with unbiased execution and deep liquidity. Backed by strategic partnerships with BNY Mellon's Pershing for clearing and custody, they deliver secure, efficient solutions for wealth managers, family offices, and accredited investors worldwide

Sources

Victim siteamstelsecurities.com

Source

Indexed 8 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.