Fintech firm Marquis notifies affected business after ransomware breach

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Marquis Fintech Firm Reports Ransomware Attack Affecting U.S. Banks Fintech firm Marquis has notified U.S. banks and credit unions of a ransomware attack that occurred in August 2025. Hackers accessed files containing sensitive customer data, impacting several clients in the financial services sector. The breach has raised significant concerns regarding the security of client information. 4 sources 53