Harnish Group Inc. data breach

Clerk's notes

Harnish Group Inc. has formally notified the Montana Attorney General's office of a data security incident. This filing, made on December 31, 2025, indicates that the breach occurred on or about November 11, 2025, involving unauthorized access to the company's systems.

While the specific categories of information involved were not detailed in the public report, Harnish Group Inc. typically manages extensive administrative records that may include sensitive personal information. If you have received a direct notification letter, it confirms that some of your data was stored within the compromised environment.

The incident is presently listed as 'investigating,' meaning that the full scope and impact of the breach are still being assessed by relevant parties. For individuals affected, this ongoing review aims to clarify how their personal information was handled and potentially compromised.

If you received an official data breach notification from Harnish Group Inc., it is important to carefully read the letter to understand the specific details provided to you. The notice should outline any protective measures the company suggests or services it offers.

Given the nature of such incidents, individuals whose personal information was potentially exposed may have questions about their rights and options. You may be eligible for a free consultation to review your situation.

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