Clop ransomware group lists HENRYPRATT.COM on its leak site

• Ransomware group: Clop
• Country: United States
• Sector: Manufacturing
• Announcement date: September 10, 2026

Clop claims a data breach against Henry Pratt Company

The Clop ransomware group has officially listed Henry Pratt Company on their dedicated leak site. This announcement, made on September 10, 2026, constitutes a claim of a data breach against the organization. The inclusion of the entity on the group's platform serves as the primary method of notification, signaling that the threat actor group asserts they have gained unauthorized access to the organization's internal data.

Ransomware leak sites are frequently utilized by cybercriminal groups as a tool for double extortion. In these scenarios, attackers do not merely encrypt an organization's systems to demand a ransom for decryption; they also threaten to publish sensitive information on public platforms if the ransom is not met. This tactic increases the pressure on the victim by threatening reputational damage and regulatory scrutiny resulting from the public exposure of private data.

Details of the alleged attack

According to the announcement posted by the Clop group, the claim of access was made on September 10, 2026. At this stage, the group has not disclosed any specific details regarding the technical process or the methodology used to execute the attack. The announcement was limited to the inclusion of Henry Pratt Company in their leak list, leaving the specific mechanics of the intrusion unknown to the public.

Regarding the content of the breach, there is no information available regarding the nature of the leaked or threatened data. The provided documentation from the leak site consists of a general waiting page and does not contain any specific data samples or files related to the organization. Consequently, the listing names no specific data types.

About Henry Pratt Company

Henry Pratt Company is an American manufacturer specializing in the production of valves and flow control products. These products are designed specifically for the water and wastewater industries. Operating under the umbrella of Mueller Water Products, the company plays a vital role in providing critical engineering solutions necessary for various infrastructure projects.

Risk assessment and industry implications

Given the established history and past activities of the Clop group, it is possible that the organization's sensitive data could be exposed or that they may face subsequent ransom demands. The group is closely associated with TA505, a threat actor known for conducting mass data theft campaigns against numerous organizations. This group frequently exploits vulnerabilities in file transfer software, such as Accellion, GoAnywhere, and MOVEit, to facilitate their operations.

The potential impact of such an event carries significant weight for a US-based entity. A confirmed data breach could trigger various legal obligations under both state laws and federal regulations. Furthermore, the group's tendency to target file transfer software increases the overall risk to the supply chain. For the organization's customers and employees, secondary risks may arise, including the potential for identity theft or highly targeted phishing attacks.

To mitigate such risks, organizations in the manufacturing and infrastructure sectors often focus on several defensive strategies. These include maintaining rigorous patch management protocols to secure file transfer software and other internet-facing applications. Implementing robust multi-factor authentication and monitoring for unusual data exfiltration patterns are also critical components of a modern cybersecurity posture. As supply chain risks increase, ensuring that all third-party software and service providers adhere to strict security standards becomes an essential part of organizational resilience.