The Maine Office of the Attorney General disclosed a data breach at Chatham Asset Management in September 2021, stemming from unauthorized access (hacking) of the company’s computer network between June 11–14, 2021. The incident compromised the personal data of 265 individuals, including the Social Security numbers (SSNs) of at least 2 Maine residents. While the breach did not involve ransomware or large-scale financial fraud, the exposure of sensitive personally identifiable information (PII)—particularly SSNs—poses a significant risk of identity theft, financial fraud, or targeted phishing attacks against affected individuals. In response, Chatham offered identity monitoring services via Experian to mitigate potential harm. The breach highlights vulnerabilities in the company’s cybersecurity defenses, raising concerns about data protection compliance and the safeguarding of employee or client information from external threats. No evidence suggests the attack disrupted operations or resulted in broader systemic damage, but the leak of high-value PII remains a critical reputational and regulatory liability.

Chatham Asset Management Data Breach Under Investigation Following Cyberattack Chatham Asset Management, a New Jersey-based hedge fund specializing in alternative assets, confirmed a data breach after detecting unauthorized activity within its network on December 8, 2025. The firm, which manages investments for high-net-worth clients and holds controlling interests in companies like Postmedia, McClatchy, and RR Donnelley, responded by securing its systems and engaging third-party cybersecurity experts to investigate. The hacking group Worldleaks claimed responsibility for the breach, threatening to publish stolen data on the dark web as early as December 23, 2025. Chatham officially disclosed the incident to regulators on January 20, 2026 (Massachusetts Office of Consumer Affairs and Business Regulation) and January 21, 2026 (Vermont Attorney General). The breach potentially exposed sensitive personally identifiable information (PII), including: - Names - Social Security numbers - Driver’s license details Affected individuals were notified and offered complimentary credit monitoring and identity restoration services through Cyberscout. Law firm Shamis & Gentile P.A. is investigating potential legal claims for those impacted. Chatham Asset Management, founded in 2001 by Anthony Melchiorre, operates with approximately 23 employees across offices in New Jersey and Chicago. The full scope of the breach and its financial or operational impact remains under review.