M&T BANK CORPORATION

M&T Bank notified customers in April 2026 that a third-party service provider experienced a security incident in August 2025. M&T's systems were not directly affected. The provider securely removed customer data. M&T is offering 24 months of Equifax credit monitoring and monitoring accounts for fraud.

M&T Bank notified Nebraska residents of a data breach involving a third-party service provider in August 2025. Customer personal information, potentially including SSNs and financial account numbers, was accessed. M&T confirmed its systems were not affected and that the provider removed the data. The bank is offering 24 months of free credit monitoring via Equifax and advising customers to monitor accounts.

M&T Bank reported a data breach to the Massachusetts Office of Consumer Affairs and Business Regulation. The breach was reported on 2025-08-08. 2 Massachusetts residents were affected.

M&T Bank reported a data breach to the Massachusetts Office of Consumer Affairs and Business Regulation. The breach was reported on 2025-03-17. 2 Massachusetts residents were affected.

M&T Bank reported a data breach to the Massachusetts Office of Consumer Affairs and Business Regulation. The breach was reported on 2025-03-06. 1 Massachusetts residents were affected.

M&T Bank reported a data breach to the Massachusetts Office of Consumer Affairs and Business Regulation. The breach was reported on 2024-12-23. 326 Massachusetts residents were affected.

M&T Bank reported that an external system breach (hacking) on May 27, 2023, resulted in the compromise of personal information for 43 Maine residents. The breach was discovered on June 1, 2023. The compromised data includes names and Social Security Numbers. Affected individuals were notified on January 26, 2024, and have been offered 24 months of identity and credit monitoring services through Kroll. The consumer notice attached to the filing is from 'Delta Dental of California and affiliates,' which may indicate the breach originated with a third-party vendor.

M&T Bank reported a data breach to the Massachusetts Office of Consumer Affairs and Business Regulation. The breach was reported on 2024-01-25. 161 Massachusetts residents were affected.

M&T Bank reported a data breach to the Massachusetts Office of Consumer Affairs and Business Regulation. The breach was reported on 2023-09-26. 95,090 Massachusetts residents were affected. The report records the breach type as electronic.

M&T Bank reported a data breach to the Massachusetts Office of Consumer Affairs and Business Regulation. The breach was reported on 2023-08-31. 2 Massachusetts residents were affected. The report records the breach type as electronic.

M&T Bank reported a data breach to the Massachusetts Office of Consumer Affairs and Business Regulation. The breach was reported on 2023-08-14. 95,261 Massachusetts residents were affected. The report records the breach type as electronic.

M&T Bank reported a data breach to the Massachusetts Office of Consumer Affairs and Business Regulation. The breach was reported on 2023-06-13. 2 Massachusetts residents were affected. The report records the breach type as electronic.

Sinai Hospital of Baltimore notified patients that M&T Bank, a vendor managing accounts receivable, experienced an incident where an unknown individual fraudulently obtained copies of patient documents between Dec 17, 2019 and Apr 30, 2020. Data included names, SSNs, health insurance info, and clinical details. Sinai offered credit monitoring.

M&T Bank reported a data breach to the Massachusetts Office of Consumer Affairs and Business Regulation. The breach was reported on 2020-07-06. 1 Massachusetts residents were affected. The report records the breach type as electronic.

M&T Bank reported to HHS on 2020-06-29 a Unauthorized Access/Disclosure affecting 5,878 individuals. Breached information located on Email. An employee was victim of a social engineering attack compromising PHI including names, addresses, financial/health insurance info, diagnoses, medications, SSNs, and driver's license numbers. The business associate implemented additional safeguards and retrained staff.

M&T Bank reported a data breach to the Massachusetts Office of Consumer Affairs and Business Regulation. The breach was reported on 2019-11-14. 1 Massachusetts residents were affected. The report records the breach type as electronic.

M&T Bank reported a data breach to the Massachusetts Office of Consumer Affairs and Business Regulation. The breach was reported on 2018-12-19. 1 Massachusetts residents were affected. The report records the breach type as electronic.