Harnish Group Inc. experienced a data breach that was reported on December 31, 2025. The breach occurred on November 6, 2025, and was confirmed by regulatory filings with the Montana Department of Justice and the Indiana Attorney General.
This incident affected 711 individuals. Specifically, 710 Montanans and 1 Indiana resident were impacted. The specific types of data exposed have not been explicitly detailed in the public search results, and a review of the official notification letter is needed for these details. The company operates in the insurance sector and is associated with Sentinel Security Life Insurance Company and Atlantic Coast Life Insurance, suggesting it may have been a vendor breach.
Details can emerge later, and notices may be delayed as investigations continue.