Where does the Harnish Group Inc. case file come from?

Every entry is taken from the breach report Harnish Group Inc. lodged with the Montana Attorney General. Nothing here is estimated.

Why do the incident date and the report date differ?

Companies usually investigate before they report. The gap between the two dates shows how long that took.

What does the records-affected figure count?

It is the number the company gave the state. It can cover residents of that state only, so the national total may be higher.

Does this case file change over time?

Yes. When a company files an update or a new state publishes its copy of the report, the dates and counts here are refreshed.

Case file

Case File: Harnish Group Inc. Data Breach

This file collects the dated facts on record for the Harnish Group Inc. incident. The state report is dated December 31, 2025. The incident itself is dated November 11, 2025.

Timeline

50 days separate the incident date from the date it was reported.

November 11, 2025Incident dateWhen the filing says the breach took place.
December 31, 2025Report filed in MontanaDate the notice was lodged with the Montana Attorney General.

Case facts

Filing state: Montana
Date reported: December 31, 2025
Incident date: November 11, 2025
Receiving office: Montana Attorney General

Case notes

Harnish Group Inc. officially reported a data security incident to authorities, with an identified breach date of November 11, 2025. The company's filing, logged on December 31, 2025, indicates an event where the security of its systems was compromised.

The nature of the breach, including how unauthorized access occurred, remains unspecified in the publicly available records. Harnish Group Inc. has stated that an investigation into the incident is currently underway to determine its full scope and impact.

While the specific categories of data involved have not been detailed in the public filing, the notification confirms that personal information may have been exposed. Recipients of official notifications should carefully review those communications for any further specifics provided by Harnish Group Inc.

Individuals who believe they may be affected by this incident are advised to remain vigilant. It is recommended to carefully review statements from financial institutions and other service providers for any unauthorized activity. Be cautious of unsolicited communications, especially those requesting personal details.

As a general precaution, consider utilizing available credit monitoring services and regularly check your credit reports for any suspicious entries. Staying informed and proactive about your accounts can help mitigate potential risks following such an event.

Questions about this case file

Where does the Harnish Group Inc. case file come from?: Every entry is taken from the breach report Harnish Group Inc. lodged with the Montana Attorney General. Nothing here is estimated.
Why do the incident date and the report date differ?: Companies usually investigate before they report. The gap between the two dates shows how long that took.
What does the records-affected figure count?: It is the number the company gave the state. It can cover residents of that state only, so the national total may be higher.
Does this case file change over time?: Yes. When a company files an update or a new state publishes its copy of the report, the dates and counts here are refreshed.

Montana data breaches

Filing source: Montana Attorney General

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Timeline

Case facts

Case notes

Questions about this case file

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