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1st MidAmerica Credit Union Data Breach Investigation
Shamis & Gentile P.A., one of the nation's premier class action law firms specializing in data breach cases, is investigating the 1st MidAmerica Credit Union 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 1st MidAmerica Credit Union
1st MidAmerica Credit Union is a member-owned, not-for-profit financial institution based in Bethalto, Illinois. Established in 1934, the credit union serves members in Illinois and Missouri, providing a wide range of financial services such as savings accounts, checking, loans, retirement options and business accounts.
With approximately 110 employees, the credit union offers both personal and business banking solutions, including online and mobile banking, credit monitoring and various loan options.
What Happened?
On Aug. 14, 2025, 1st MidAmerica Credit Union was notified by its vendor, Marquis Software Solutions, of suspicious activity on Marquis’ network. Marquis determined that an unauthorized third party had accessed its computing environment and may have acquired files containing sensitive information.
By Oct. 27, 2025, Marquis provided a list of potentially affected data, and on Nov. 24, 2025, it was confirmed that the personal information of 131,070 individuals in the United States was involved in the breach, including seven Maine residents and seven New Hampshire residents.
The types of information exposed in this incident include:
Information Exposed:
- First and last names
- Social Security numbers
The breach was disclosed to the attorneys general offices of Maine, New Hampshire, and Vermont starting on Jan. 30, 2026. Affected individuals were notified in writing.
Your Rights and Next Steps
If you received a notification that your information was involved in the 1st MidAmerica Credit Union data breach, you have important rights and options.
First, take advantage of the free 24-month credit monitoring and identity protection services being offered. This can help detect any misuse of your personal information and provide assistance if identity theft occurs.
It is also a good idea to remain vigilant by regularly reviewing your account statements and credit reports for any unauthorized activity. Under federal law, you are entitled to one free credit report annually from each of the three major credit bureaus. You may also consider placing a fraud alert or credit freeze on your credit file to help prevent new accounts from being opened in your name without your consent.
If you notice any suspicious activity, report it promptly to your financial institution and local law enforcement. You have the right to file a police report and to report identity theft to the Federal Trade Commission.
Individuals affected by this breach may have legal rights to seek compensation for any harm suffered as a result of the incident. Lawyers are ready to help guide you through the process and ensure your rights are protected.
You May Be Entitled to Compensation
If your information was compromised in the 1st MidAmerica Credit Union data breach, you may be eligible for compensation. Lawyers are investigating claims on behalf of those affected and are ready to help you understand your options.
To find out if you qualify to join a lawsuit or receive compensation, complete the below form.
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