Sellmark Corporation Data Breach Lawsuit

Sellmark Corporation has confirmed a data breach that impacted 1,408 individuals, including 1 resident of Maine. The breach, which involved unauthorized access to Sellmark’s computer network, was discovered in August 2025 and affected sensitive personal data, including payment card information. If you were affected by this breach, read on to learn more about the incident and your legal options.

Sellmark Corporation’s Data Breach Investigation

On March 10, 2025, Sellmark Corporation detected unauthorized access to its computer network. The company immediately took steps to secure its systems and launched an investigation with the assistance of a cybersecurity firm. Sellmark also reported the incident to law enforcement.

The investigation revealed that an unauthorized actor had accessed Sellmark’s network and obtained copies of certain files from its servers. After conducting a thorough review, Sellmark determined that one or more of these files contained personal information, including names and payment card information, of individuals affected by the breach.

On August 14, 2025, Sellmark confirmed that the breach impacted one resident of Maine, whose payment card details and name were accessed. The company responded by mailing notification letters to the affected individual and providing a toll-free call center for further inquiries.

To prevent future incidents, Sellmark implemented additional security measures to strengthen its computer network and protect personal information.

When Did This Breach Occur?

The data breach occurred on March 10, 2025. The breach was discovered on August 14, 2025, and notification letters were sent to affected individuals, including the Maine resident, on September 11, 2025.

What Information Was Breached?

The following personal information was potentially compromised:

• Full Name
• Payment Card Information

What You Can Do

If you were affected by this breach, you should take the following steps to protect your personal information:

1. Monitor Your Financial Accounts: Regularly review your account statements for any unauthorized transactions and report any suspicious activity to your financial institution immediately.
2. Check Your Credit Reports: Keep an eye on your credit reports for any signs of identity theft or fraudulent activity.
3. Place a Fraud Alert: Consider placing a fraud alert on your credit file to alert creditors to take extra steps to verify your identity before issuing credit in your name.
4. Freeze Your Credit: A credit freeze can prevent unauthorized individuals from opening accounts in your name.
5. Contact the Call Center: If you have questions or need more information, contact the dedicated toll-free call center set up by Sellmark.

File a Data Breach Lawsuit Against Sellmark Corporation

If you were affected by this data breach, you may have the right to pursue a class action lawsuit against Sellmark. Individuals who have received a data breach notification from the credit union could be entitled to compensation for the exposure of their personal information.

At Class Action U, we can help you understand your legal options. If you believe your personal information was compromised in this breach, don’t wait—take action now.

Contact us at Class Action U, where we’ll connect you with a lawyer skilled in class action lawsuits. If you’ve been contacted about this breach, received notice, or believe you were impacted, fill out our quick, easy, and secure form to sign up. There is no cost to reach out to our legal partner, and no obligation after speaking with someone from our team. Don’t stand alone—join the class!