Colliers Listed by The Gentlemen 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.