Marquis estimates that more than 672,000 people have had their personal and financial information stolen in ransomware attacks.

Marquis, a technology company used by hundreds of banks to analyze and track their customers’ data, says hundreds of thousands of people had their financial and financial information stolen in a ransomware attack last year.

The Plano, Texas-based fintech company is notifying at least 672,075 people that hackers stole their information during the August 2025 cyber security campaign, according to schedule and the Maine attorney general’s office.

More than half of all those affected live in Texas, according to the data breach notice issued in the government.

Revealed is the full picture of the number of people affected by the breach, which has not been reported before.

The breach allowed hackers to steal bank customers’ names, dates of birth, and postal addresses. Thieves also stole customers’ financial information, such as bank accounts, credit card numbers, and credit card numbers. Marquis said the hackers also took Social Security customer numbers.

A fintech company sued the firewall provider, SonicWallin February, accusing the company of security failures that allowed hackers to steal critical information about its firewalls, which hackers used to compromise Marquis’ network, steal data, and install ransomware.

In his lawsuit, Mr. Marquis said SonicWall created a vulnerability that allowed hackers to steal the backup files of its customers, including Mr. Marquis.

Marquis did not immediately respond when contacted by TechCrunch.