- Updated: March 18, 2026
- 3 min read
Marquis ransomware attack exposes data of over 672,000 individuals
In Brief Posted: 7:37 AM PDT · March 18, 2026 Image Credits:Getty Images Zack Whittaker Marquis says over 672,000 people had personal and financial data stolen in ransomware attack 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 is notifying at least 672,075 people that hackers stole their information during the August 2025 cyberattack, according to a listing with Maine’s attorney general’s office. More than half of all those affected live in Texas, according to a separate data breach notice filed in the state. The disclosure is the fullest picture yet of the number of people affected by the breach, which has not been previously reported.The breach allowed hackers to steal banking customers’ names, dates of birth, and postal addresses. The hackers also stole customers’ financial information, such as bank accounts, debit, and credit card numbers. Marquis said the hackers also took customers’ Social Security numbers.The fintech company sued its firewall provider, SonicWall, in February, accusing the company of security failings that allowed hackers to steal critical information about its firewalls, which hackers then used to compromise Marquis’ network, steal data, and deploy ransomware. In its lawsuit, Marquis said SonicWall created a vulnerability that allowed hackers to steal its customers’ firewall configuration backup files, including Marquis’ own.Marquis did not immediately comment when contacted by TechCrunch. Topics Banking, cybersecurity, data breach, marquis, ransomware, Security June 9 Boston, MA Actively scaling? Fundraising? Planning your next launch?TechCrunch Founder Summit 2026 delivers tactical playbooks and direct access to 1,000+ founders and investors who are building, backing, and closing.REGISTER NOW Newsletters See More Subscribe for the industry’s biggest tech news TechCrunch Daily News Every weekday and Sunday, you can get the best of TechCrunch’s coverage. TechCrunch Mobility TechCrunch Mobility is your destination for transportation news and insight. Startups Weekly Startups are the core of TechCrunch, so get our best coverage delivered weekly. StrictlyVC Provides movers and shakers with the info they need to start their day. No newsletters selected.Subscribe By submitting your email, you agree to our Terms and Privacy Notice.Related Security Russians caught stealing personal data from Ukrainians with new advanced iPhone hacking tools Lorenzo Franceschi-Bicchierai 40 minutes ago Gadgets Mave Health aims to improve attention and mood with its brain-stimulating headset Ivan Mehta 2 hours ago Fintech Kalshi’s legal troubles pile up, as Arizona files first ever criminal charges over ‘illegal gambling business’ Lucas Ropek 17 hours ago Latest in Security In Brief Marquis says over 672,000 people had personal and financial data stolen in ransomware attack Zack Whittaker 3 minutes ago Security Russians caught stealing personal data from Ukrainians with new advanced iPhone hacking tools Lorenzo Franceschi-Bicchierai 40 minutes ago In Brief Apple rolls out first ‘background security’ update for iPhones, iPads, and Macs to fix Safari bug Zack Whittaker 18 hours ago
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