Where does the M&T Bank case file come from?

Every entry is taken from the breach report M&T Bank lodged with the Massachusetts 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: M&T Bank Data Breach

This file collects the dated facts on record for the M&T Bank incident. The state report is dated April 17, 2026.

Timeline

April 17, 2026Report filed in MassachusettsDate the notice was lodged with the Massachusetts Attorney General.

Case facts

Filing state: Massachusetts
Date reported: April 17, 2026
Receiving office: Massachusetts Attorney General

Case notes

M&T Bank reported a data security incident to the Massachusetts Attorney General's office on April 17, 2026. The official filing indicates that this event is currently under investigation, with specific details about the breach type and its scope yet to be fully disclosed.

As a prominent financial institution operating across the Northeastern and Mid-Atlantic United States, M&T Bank routinely handles a significant volume of personal and financial data for its retail, commercial, and wealth management customers. While the exact nature of the compromised information in this particular incident is not specified, such institutions manage sensitive details essential for providing various banking services.

The public record from the Attorney General's office does not detail the specific categories of personal information potentially exposed, nor does it specify the number of individuals affected by this event. The breach date and the precise method of compromise also remain unstated, highlighting the ongoing investigative status of the incident.

Individuals who may have received a notification from M&T Bank regarding this incident should review all communications carefully. It is generally advisable to monitor your financial accounts and credit reports for any unusual or unauthorized activity. Consider placing a fraud alert or security freeze on your credit files with the major credit bureaus as a proactive measure.

Staying informed about your financial statements and practicing strong password hygiene are also crucial steps. Report any suspicious activity directly to your financial institution and relevant authorities without delay.

Questions about this case file

Where does the M&T Bank case file come from?: Every entry is taken from the breach report M&T Bank lodged with the Massachusetts 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.

Massachusetts data breaches

Timeline

Case facts

Case notes

Questions about this case file

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