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Case File: Sentinel Security Life Insurance Company and Atlantic Coast Life Insurance Company Data Breach

This file collects the dated facts on record for the Sentinel Security Life Insurance Company and Atlantic Coast Life Insurance Company incident. The state report is dated December 30, 2025. The incident itself is dated April 7, 2025.

Timeline

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

  1. April 7, 2025Incident dateWhen the filing says the breach took place.
  2. December 30, 2025Report filed in MontanaDate the notice was lodged with the Montana Attorney General.

Case facts

Filing state
Montana
Date reported
December 30, 2025
Incident date
April 7, 2025
Receiving office
Montana Attorney General

Case notes

Sentinel Security Life Insurance Company and Atlantic Coast Life Insurance Company, both providers of insurance services, formally disclosed a data breach incident to the Montana Attorney General. This disclosure indicates that systems containing sensitive policyholder information were subjected to unauthorized access.

The breach date for this incident is documented as April 7, 2025, with the official report filed on December 30, 2025. The companies indicate that an investigation into the nature and scope of the unauthorized access is currently underway. While the specific categories of data involved were not detailed in the public filing, the event potentially exposed personal information.

If you received a data breach notification letter from either Sentinel Security Life or Atlantic Coast Life, it is an indication that your personal information may have been part of the compromised data. These letters are issued to inform you of the situation and the steps being taken by the companies to address the security event.

Individuals who may be affected by this breach should remain vigilant. It is prudent to monitor financial account statements and credit reports for any unusual activity. Be cautious of unsolicited communications, especially those requesting personal information, as they could be phishing attempts. Consider placing a fraud alert or security freeze on your credit files as a general protective measure.

All details regarding this data breach incident are derived from public filings submitted by Sentinel Security Life Insurance Company and Atlantic Coast Life Insurance Company to regulatory bodies, consistent with reporting requirements for such events.

Questions about this case file

Where does the Sentinel Security Life Insurance Company and Atlantic Coast Life Insurance Company case file come from?
Every entry is taken from the breach report Sentinel Security Life Insurance Company and Atlantic Coast Life Insurance Company 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.

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