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Investigation OpenIN AG filing · March 16, 2026

Old National Bank Data Breach Letter Explained (March 2026 Filing)

Old National Bank reported a data incident on March 16, 2026, stemming from an event that occurred in August 2025. If you received a notification letter from the bank, your personal information may have been compromised. Understanding the official record of this breach can help you assess potential risks and determine your next steps.

This breach is real, not a scam. Old National Bank (see 2025 Report for Marquis Software Solutions) officially reported it to the IN Attorney General on March 16, 2026.

Reviewed by David S. Harris, Esq., data breach and class action attorney (Florida Bar No. 0112739). Free consultation: 786-306-7278

Received a Old National Bank (see 2025 Report for Marquis Software Solutions) notification letter? Find out in minutes if you qualify for compensation.

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State
IN
Breach date
August 14, 2025
Reported
March 16, 2026

If you recently received a data breach notification letter from Old National Bank, it refers to an incident the company reported on March 16, 2026. This notification confirms that certain personal information was involved in a data event that took place on August 14, 2025.

According to the public record, the nature of this breach and the specific types of data exposed were not detailed. However, receiving such a letter means Old National Bank has determined that your personal information was part of the incident and warrants your attention.

While the investigation is ongoing, the potential exposure of your data can lead to risks such as identity theft or fraud. It is prudent to monitor your financial accounts and credit reports for any suspicious activity. Many experts recommend placing a fraud alert or freezing your credit to help protect yourself.

The purpose of the notification letter is to inform you about the incident and encourage you to take protective measures. These letters serve as a critical record of what happened and are often the first step for individuals seeking to understand their position following a data compromise.

If you are uncertain about the specific risks you face or what further actions you should take after receiving the Old National Bank data breach notification, you may wish to consider a free case review. This can help you understand your legal options and potential avenues for recourse.

What to do if you were affected

These general steps can help limit the risk of identity theft and fraud after any data breach.

  • Stay alert to targeted scams

    Be cautious of calls, texts, or emails that reference this breach. Legitimate organizations won't ask you to confirm sensitive details through an unsolicited message.

  • Keep your notification letter

    Save the notice you received. It documents that your information was involved and is often needed to enroll in any credit monitoring offered or to join a related legal claim.

Old National Bank data breach notice and letter questions

Is the Old National Bank data breach letter legit or a scam?
A notice from Old National Bank in the mail matches the breach Old National Bank reported to the IN Attorney General on March 16, 2026. Check that the company name and dates in your letter match that filing. A real notice of data security incident won't ask for your password, Social Security number or a payment — if it does, contact Old National Bank through a phone number or website you find yourself.
Where can I see the official Old National Bank breach notice?
Old National Bank's report is published by the IN Attorney General: https://www.in.gov/attorneygeneral/consumer-protection-division/id-theft-prevention/security-breaches/#old-national-bank-see-2025-report-for-marquis-software-solut-2026 Compare it with the letter you received to confirm the dates and details match.
Did Old National Bank offer free credit monitoring?
Any free monitoring Old National Bank is offering will be described in the notice you received, along with an activation code and a sign-up deadline. Signing up doesn't waive any legal rights you may have.
What should I do after getting the Old National Bank data breach notice?
Keep the letter and the envelope, and note the date it arrived. Freeze your credit with Equifax, Experian and TransUnion, change any passwords the notice mentions, and sign up for any free credit monitoring the letter offers. Then check whether you may have a claim.
Is there a Old National Bank data breach class action lawsuit?
Law firms often open an investigation after a breach notice like this one, and a class action lawsuit may follow. This page doesn't confirm that a lawsuit has been filed against Old National Bank. You usually don't have to join a class action to be included — if a settlement is reached, class members are notified and can file a claim.
Do I need a Old National Bank data breach lawyer or attorney?
Talking to a data breach attorney costs nothing here. A lawyer can read your notice, explain your rights under your state's law and tell you whether a claim makes sense.
How much could a Old National Bank data breach settlement or claim be worth?
There is no set amount, and no Old National Bank settlement is confirmed here. In past data breach settlements, payments depended on what data was exposed and on documented losses — fraud, out-of-pocket costs and time spent dealing with the breach. Keep receipts and records; they're what damages claims are built on.
Can I sue Old National Bank over the data breach?
It depends on what was exposed, the law in IN and your own state, and whether you've been harmed. Most people take part through a class action rather than suing alone. Keep your notification letter — it's the proof that connects you to the breach.

Source: IN Attorney General filing

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