More than 672,000 people had their personal and financial data stolen in the ransomware attack, Marquez says

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

The Plano, Texas-based fintech company notified at least 672,075 people that hackers stole their information during the August 2025 cyberattack, according to existing With the Maine Attorney General’s Office.

More than half of those affected live in Texas, according to a separate notification filed about the data breach In the country.

This revelation is the most complete picture yet of the number of people affected by the hack, which had not been previously reported.

The hack allowed hackers to steal bank customers’ names, dates of birth and mailing addresses. Hackers also stole customers’ financial information, such as bank accounts and debit and credit card numbers. The hackers also took customers’ Social Security numbers, Marquez said.

Financial technology company It filed a lawsuit against its firewall provider, SonicWallin February, accusing the company of security failures that allowed hackers to steal critical information about its firewalls, which the hackers then used to breach Marquez’s network, steal data, and spread ransomware.

Marquis said in its lawsuit that SonicWall created a vulnerability that allowed hackers to steal its customers’ firewall configuration backup files, including Marquis’s own files.

Marquez did not immediately comment when contacted by TechCrunch.