Was Henry Frerk Sons hit by ransomware?

Henry Frerk Sons was listed by the thegentlemen ransomware operation (United States), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the thegentlemen ransomware group?

thegentlemen is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Henry Frerk Sons breach?

thegentlemen published data attributed to Henry Frerk Sons. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Henry Frerk Sons

Claimed by Thegentlemen · listed 6 days ago

Age

since listed · data leaked

Status timeline

ListedJul 23, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: United States
Sector: Manufacturing
Listed on leak site: Jul 23, 2026

About the victim

AI dossier — public-source company profile

Henry Frerk Sons is a Chicago-based masonry and plaster restoration supplier with over 140 years of history. They specialize in custom mortar matching, historic preservation materials (natural hydraulic lime, specialized cleaners, sealers), and operate a volumetric ready-mix concrete fleet serving both historic preservation and new construction projects.

Industry: Masonry & Plaster Restoration Materials
Address: 3135 W Belmont Ave, Chicago, IL 60618
Founded: 1884

Attack summary

Severity: low — No proof files, screenshots, or sample data are advertised in the post. No operational impact is stated. The disclosure appears to be a listing/announcement only. No sensitive data categories (PII at scale, financial records, trade secrets) are explicitly mentioned.

The threat actor claims to have conducted an attack on Henry Frerk Sons and published data. The post does not specify whether encryption, exfiltration, or both occurred, nor does it detail what data was compromised.

low

What the group claims

***.com zoominfo.com/c/henry-frerk-sons-inc/44255454 Henry Frerk Sons (HFS Materials) is a premier masonry and plaster restoration supplier based in the Chicago region, with over 140 years of history. They specialize in custom matching and blending of historic mortars, concrete, and stone patching materials, alongside offering on-site volumetric ready-mix concrete services. The company provides a comprehensive range of building materials, including natural hydraulic lime, specialized cleaners, sealers, and preblended mortars for both historic preservation and new construction projects

Sources

Victim sitehfsmaterials.com

Source

Indexed 6 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.

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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 655 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post July 28, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

July 23, 2026Henry Frerk Sons listed by thegentlemenon the group's public leak site

Other recent disclosures by thegentlemen

thegentlemen has been linked to 655 public victims on Darkfield. A sample of the most recent:

See the full thegentlemen dossier →

Sector and geography

This disclosure adds to ransomware activity in the Manufacturing sector, which has 3,684 disclosures indexed across all operators we track. Geographically, Henry Frerk Sons is reported in United States, a country with 3,138 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means Henry Frerk Sons appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
Monitor for the data appearing on thegentlemen's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

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.