Fintech firm Marquis alerts dozens of US banks and credit unions of a data breach after ransomware attack

Fintech company Marquis is notifying dozens of U.S. banks and credit unions that they had customer data stolen in a cyberattack earlier this year.

Details of the cyberattack emerged this week after Marquis filed data breach notices with several U.S. states confirming its August 14 incident as a ransomware attack.

Texas-based Marquis is a marketing and compliance provider that allows banks and other financial institutions to collect and visualize all of their customer data in one place. The company counts more than 700 banking and credit union customers on its website. As such, Marquis has access to and stores large amounts of data belonging to consumer banking customers across the United States.

At least 400,000 people are so far confirmed affected by the data breach, according to leg