Bison State Bank Confirms Data Security Incident to NH Regulators

Bison State Bank, a financial institution providing banking services in New Hampshire, has filed an official notification regarding a data security incident. The bank reported to the New Hampshire Attorney General on February 9, 2026, that unauthorized access to its internal systems had occurred. The investigation into the incident is currently ongoing.

The official filing indicates that this unauthorized access could have exposed personal information maintained by the bank. While the specific categories of data involved have not been detailed in the public record, customers who received a direct notification from Bison State Bank should understand that their data was potentially compromised during this event.

For individuals who have received a data breach notification letter from Bison State Bank, it is important to review the contents of that letter carefully. Such a notification typically signifies that your personal information was part of the data environment accessed without authorization.

To help protect your information, it is generally recommended to remain vigilant. Regularly review your bank and credit card statements for any unusual or unauthorized transactions. Consider placing a fraud alert or security freeze on your credit reports with the major credit bureaus to prevent new accounts from being opened in your name.

Additionally, be cautious of unsolicited communications, especially those requesting personal details. Phishing attempts often follow data incidents. Bison State Bank is actively investigating the scope and nature of this security event, and customers should stay informed through official communications from the bank.