Thompson and Horton LLP data breach

Clerk's notes

Thompson and Horton LLP, a law firm based in Massachusetts, has formally reported a data security incident. This filing was made with the state's Attorney General on October 30, 2025, and indicates that unauthorized actors gained access to the firm's network infrastructure. The investigation into the scope and nature of this incident is currently ongoing.

While the specific categories of information involved in this breach have not been publicly disclosed, law firms like Thompson and Horton LLP routinely handle vast amounts of highly sensitive personal information belonging to clients, employees, and other associated parties. Such data can include comprehensive details that, if compromised, pose significant risks to affected individuals.

Receiving a formal data breach notification letter from Thompson and Horton LLP means the firm has determined that your personal information was compromised due to their security failure. This notification is a critical legal document, establishing your standing to seek accountability and potential compensation for the incident. It confirms that your data was involved in a security lapse.

Law firms have stringent legal and ethical obligations to protect the confidentiality and security of the information they hold. These duties require implementing strong security safeguards to prevent unauthorized access and disclosure. A successful data breach suggests that these protocols may have been insufficient or improperly maintained, potentially constituting a failure in their duty of care.

If you have received a notification letter regarding the Thompson and Horton LLP data incident, it is important to understand your rights. We are currently investigating potential claims related to this incident. Affected individuals should consider seeking a review of their situation to understand the implications of this data exposure and any available recourse.

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