A digital, marketing and communications firm serving US banks has been hit by a massive data breach that impacted more than half a million Americans.
In a new filing with the Office of the Maine Attorney General, Marquis Software Solutions says it suffered a major data security incident affecting 672,075 people.
According to Marquis, an unauthorized third party accessed its systems and stole files from its database.
While the firm did not specify the types of data potentially stolen from its network, it says the breach is limited to its database and did not affect its customers’ systems.
“On or around August 14, 2025, we identified suspicious activity on our network. Our investigation later determined that it was the result of a data security incident. Upon learning of the incident, we immediately launched an investigation and engaged the appropriate cybersecurity experts to assist. We also promptly notified law enforcement…
Our customer reviewed the affected files on December 10, 2025, and afterwards worked to validate and identify individuals whose information may have been affected by the incident, and our customer worked as quickly as possible to obtain individuals’ most recent mailing address information.”
Marquis urges affected people to keep an eye on their accounts and immediately report any suspicious activity to authorities, while offering a free one-year identity monitoring service from Epiq Privacy Solutions ID, which includes identity insurance and resolution services.
For now, the banking industry vendor says it has not detected any misuse of the potentially exposed data for fraud or identity theft.
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