MJMS Family Office Services LLC and Madden, Jiganti, Moore & Sheridan LLP data breach

Clerk's notes

On July 14, 2026, MJMS Family Office Services LLC and Madden, Jiganti, Moore & Sheridan LLP filed a report with the Massachusetts Attorney General regarding a data security incident. This filing indicates that the digital safeguards protecting their network infrastructure were compromised, potentially exposing confidential information.

These firms specialize in services for ultra-high-net-worth individuals, family offices, and trusts, centralizing a significant volume of highly sensitive personal information. The breach’s precise mechanics remain under investigation; however, such incidents often involve sophisticated attacks exploiting vulnerabilities in systems designed to hold dense legal and financial documents. The report confirms that personal information under their care was affected.

The exposure of this kind of information can create risks for those affected, potentially leading to various forms of misuse of your data. While the specific categories of information involved are not detailed in the public report, the nature of these firms' operations suggests that comprehensive personal and financial details are routinely managed and stored.

Under Massachusetts state laws and other data protection standards, entities entrusted with private client data have a stringent legal duty to implement and maintain robust security measures. Receiving a data breach notification letter from MJMS Family Office Services LLC or Madden, Jiganti, Moore & Sheridan LLP serves as formal acknowledgment that your private information was involved in this security lapse.

If you received such a notification, it is important to carefully review the letter for specific details provided by the companies. Understanding what information was potentially affected and the steps they recommend is crucial. Considering a free case review allows you to discuss the specifics of your situation and learn about your legal rights without any obligation.

If a notification letter about this breach reached you, see every Massachusetts data breach on file or browse all cases.