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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 535 Texas residents, 289 Indiana residents, 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
- Dates of birth
- Financial account information (credit/debit card numbers, account numbers)
The breach was disclosed to the attorneys general offices of Maine, Indiana, New Hampshire, Texas, and Vermont starting on Jan. 30, 2026. Affected individuals were notified in writing.
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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