Marquis: Marquis Ransomware Attack Exposes 672K Social Security Numbers

Marquis Fintech Suffers Massive Ransomware Breach, Exposing 672,000 Customers’ Data

Fintech firm Marquis has notified over 672,000 individuals that their personal and financial data was stolen in a ransomware attack, marking one of the largest fintech breaches of 2026. The compromised information includes Social Security numbers, banking details, and other sensitive records, heightening risks of identity theft and financial fraud for affected customers.

The company disclosed the incident in recent regulatory filings but has not clarified when the breach occurred or how long attackers maintained access to its systems. The scale of the exposure equivalent to the population of Washington, D.C. underscores the severity of the attack, particularly given the inclusion of Social Security numbers, which are highly prized by cybercriminals for long-term exploitation.

This breach reflects the evolving tactics of ransomware groups, which now routinely exfiltrate data before encrypting systems a dual-extortion strategy that maximizes leverage over victims. The incident adds Marquis to a growing list of high-profile data breach victims in 2026, highlighting persistent vulnerabilities in financial sector cybersecurity.

Source: https://www.techbuzz.ai/articles/marquis-ransomware-attack-exposes-672k-social-security-numbers

Marquis Inc cybersecurity rating report: https://www.rankiteo.com/company/marquis-inc

"id": "MAR1773853568",
"linkid": "marquis-inc",
"type": "Ransomware",
"date": "3/2026",
"severity": "100",
"impact": "5",
"explanation": "Attack threatening the organization's existence"

{'affected_entities': [{'customers_affected': '672,000',
                        'industry': 'Financial Services',
                        'name': 'Marquis',
                        'type': 'Fintech firm'}],
 'customer_advisories': 'Notification to 672,000 individuals',
 'data_breach': {'data_exfiltration': 'Yes',
                 'number_of_records_exposed': '672,000',
                 'personally_identifiable_information': 'Yes',
                 'sensitivity_of_data': 'High',
                 'type_of_data_compromised': ['Social Security numbers',
                                              'Banking details',
                                              'Personal and financial data']},
 'description': 'Fintech firm Marquis has notified over 672,000 individuals '
                'that their personal and financial data was stolen in a '
                'ransomware attack, marking one of the largest fintech '
                'breaches of 2026. The compromised information includes Social '
                'Security numbers, banking details, and other sensitive '
                'records, heightening risks of identity theft and financial '
                'fraud for affected customers.',
 'impact': {'brand_reputation_impact': 'High',
            'data_compromised': 'Personal and financial data, including Social '
                                'Security numbers and banking details',
            'identity_theft_risk': 'High',
            'payment_information_risk': 'High'},
 'motivation': 'Financial gain (dual-extortion strategy)',
 'ransomware': {'data_encryption': 'Yes (implied by ransomware attack)',
                'data_exfiltration': 'Yes'},
 'references': [{'source': 'Regulatory filings'}],
 'regulatory_compliance': {'regulatory_notifications': 'Yes (regulatory '
                                                       'filings)'},
 'response': {'communication_strategy': 'Regulatory filings'},
 'title': 'Marquis Fintech Suffers Massive Ransomware Breach, Exposing 672,000 '
          'Customers’ Data',
 'type': 'Ransomware'}