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Bison State Bank Data Breach Lawsuit Investigation
Shamis & Gentile P.A., one of the nation's premier class action law firms specializing in data breach cases, is investigating the Bison State Bank data breach.
If you were affected by the data breach, your sensitive personally identifiable information may have been exposed, and you may be eligible for compensation.
About Bison State Bank
Bison State Bank is a community-focused commercial bank established in 1901 in Bison, Kansas. The bank operates two branches, including its headquarters at 223 Main St, Bison, KS 67520, and another location in Kansas City at 9201 Ward Parkway.
The bank provides personalized banking services to individuals, small businesses and residential lending clients.
What Happened?
Bison State Bank discovered that a single email account was accessed by an unauthorized party between approximately April 17, 2025, and June 30, 2025.
After a thorough investigation with external cybersecurity professionals, the bank determined that the compromised email account contained personal information belonging to certain individuals. On Jan. 6, 2026, Bison State Bank confirmed that some files in the affected account included sensitive data.
The types of consumer information exposed in this breach include:
Information Exposed:
- Social Security numbers
- Financial account numbers
- Driver's licenses
- Credit/debit numbers
According to the notice filed with the Massachusetts Attorney General's office on Jan. 31, 2026, at least five Massachusetts residents were impacted.
Your Rights and Next Steps
If you received a notice from Bison State Bank about this incident, there are important steps to take to protect your information and your rights.
First, consider enrolling in the complimentary credit monitoring and identity theft protection services being offered. These services can help detect potential misuse of your information and provide support if identity theft occurs.
Next, you may want to place a fraud alert on your credit files. This free service notifies creditors to verify your identity before opening new accounts in your name. You can request a fraud alert by contacting any of the three major credit bureaus: Equifax, Experian or TransUnion.
Another option is to place a security freeze on your credit report. This prevents new credit from being opened in your name without your explicit authorization. Security freezes are also free and can be set up by contacting each credit bureau directly.
You are entitled to a free credit report every 12 months from each of the three major credit bureaus. Reviewing your credit reports regularly can help you spot unauthorized activity early.
If you notice any suspicious activity, report it to law enforcement and file a complaint with the Federal Trade Commission.
You May Be Entitled to Compensation
If your information was affected by the Bison State Bank data breach, you may be entitled to compensation. Lawyers are ready to help individuals whose sensitive information was exposed as a result of this incident. By taking action, you can help hold companies accountable for protecting personal data.
To find out if you qualify and to join a potential lawsuit, complete the below form.
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