Colliers Listed by thegentlemen Ransomware Group

On February 19, 2025, commercial real estate giant Colliers International Group Inc. appeared on the leak site of the ransomware group known as thegentlemen. The listing indicates that internal files were exfiltrated during a ransomware attack on the company, which provides brokerage, property management, and valuation services to corporations, financial institutions, governments, and private clients worldwide.

What Public Reporting Shows

Public reporting indicates that Colliers, a publicly traded company with ticker symbol CIGI and annual revenue of $5.2 billion, had data taken by the attackers. The exposed material consists of internal files rather than a specific customer database. No exact victim count inside the company or among its clients has been disclosed. The incident follows the group’s typical pattern of stealing data before encrypting systems and then threatening to publish it unless a ransom is paid.

Why This Matters for You and Your Family

When a large service provider like Colliers suffers a breach, the ripple effects reach ordinary people. If you have ever worked with a real estate broker, leased office space, bought or sold property, or used any related financial or valuation services, your personal or financial details may sit inside the compromised files. Names, addresses, phone numbers, email accounts, contract details, and banking references are the kinds of records real estate firms routinely handle. Once those records leave the company’s control, they can be sold, traded, or used to target you with identity theft, phishing, or harassment. Your family’s information is often stored alongside yours—spouses, dependents, and shared addresses—creating a single point of failure that can affect everyone at home.

The Doxxing and Identity-Chain Implications

Stolen internal files frequently contain more than isolated records. They can link email addresses to physical addresses, phone numbers to client notes, and employee logins to external vendors. Attackers and data brokers then combine these fragments with information from other breaches to build detailed profiles. A single leaked real estate contract can expose your home address, children’s names, or even references to family trusts. These connections turn one breach into a chain that fuels doxxing, swatting, or repeated targeting across multiple platforms. Credential leaks of this nature also cascade into account takeovers, especially for gaming accounts that often reuse the same email or password combinations found in professional files.

Thegentlemen’s Publicly Known Track Record

Public reporting attributes thegentlemen ransomware group with emerging in late 2023. The group has targeted organizations across multiple sectors, with prior victims including mid-sized to large companies whose data later appeared on their leak site. Their typical playbook begins with initial access through phishing or exploited remote desktop services, followed by exfiltration of sensitive files, deployment of ransomware to encrypt systems, and finally extortion based on the threat of public release. They maintain a leak site on the dark web where samples and full datasets are posted if demands are not met.

What to do

• Run a DoxxScan to map every link between your handles, emails, phone numbers, and real identity, then use the cleanup of Warden to remove what you can.
• Enable continuous DoxxScan monitoring across 13.1B+ breach records and 100+ platforms so the next exposure of your data is caught in hours rather than months.
• Rotate any password you used at Colliers or related real estate services anywhere it has been reused, and switch on 2FA through an authenticator app instead of SMS.
• Cover the household with DoxxScan family coverage that extends to dependents and your children’s gaming accounts, which often chain back to the same addresses and emails found in professional leaks.
• Let remediation specialists handle takedown requests across data brokers and exposed profiles so you do not have to chase them yourself.

The Colliers incident is a reminder that data held by large service providers can suddenly surface on ransomware leak sites with little warning. Taking concrete steps now limits how far attackers can travel down the identity chain that begins with one breach. DoxxScan by GalaxyWarden delivers continuous monitoring across 13.1 billion+ breach records and more than 100 platforms, AI-powered identity-chain mapping, and hands-on remediation by specialists, including household coverage that protects children’s gaming accounts vulnerable to the same credential-stuffing attacks. Start your DoxxScan trial today and close the gaps before the next leak appears.