Williams Accountancy Corporation Suffers Data Breach, Exposing Sensitive Client Information
Williams Accountancy Corporation, a California-based accounting firm founded in 1999, recently disclosed a data breach that compromised sensitive personal information of its clients. The firm, headquartered in Newport Beach, provides tax consulting and accounting services under the leadership of principal Robert Williams.
The breach was detected on December 30, 2025, after an unauthorized third party accessed the company’s network on December 25 and 26, 2025. Following the discovery, Williams Accountancy took containment measures and engaged a forensic security firm to investigate. By February 5, 2026, it was confirmed that files containing personally identifiable information (PII) had been exfiltrated.
Exposed data includes:
- Names
- Dates of birth
- Social Security numbers
- Bank account numbers
The law firm Shamis & Gentile P.A. is currently investigating the incident and potential legal claims on behalf of affected individuals. Those impacted may be eligible for compensation related to the breach. The full scope of the breach and the number of affected clients remain undisclosed.
Source: https://www.claimdepot.com/investigations/williams-accountancy-data-breach-2026
Victor J Williams, CPA, PA cybersecurity rating report: https://www.rankiteo.com/company/victor-j-williams-cpa-pa
"id": "VIC1772822158",
"linkid": "victor-j-williams-cpa-pa",
"type": "Breach",
"date": "12/2025",
"severity": "85",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"{'affected_entities': [{'industry': 'Accounting/Tax Consulting',
'location': 'Newport Beach, California, USA',
'name': 'Williams Accountancy Corporation',
'type': 'Accounting Firm'}],
'data_breach': {'data_exfiltration': 'Yes',
'personally_identifiable_information': 'Yes',
'sensitivity_of_data': 'High',
'type_of_data_compromised': ['Names',
'Dates of birth',
'Social Security numbers',
'Bank account numbers']},
'date_detected': '2025-12-30',
'date_publicly_disclosed': '2026-02-05',
'description': 'Williams Accountancy Corporation, a California-based '
'accounting firm, suffered a data breach that compromised '
'sensitive personal information of its clients. An '
'unauthorized third party accessed the company’s network and '
'exfiltrated files containing personally identifiable '
'information (PII).',
'impact': {'data_compromised': 'Personally identifiable information (PII)',
'identity_theft_risk': 'High',
'legal_liabilities': 'Potential legal claims',
'payment_information_risk': 'High'},
'investigation_status': 'Ongoing',
'references': [{'source': 'Incident Disclosure'}],
'regulatory_compliance': {'legal_actions': 'Potential legal claims being '
'investigated by Shamis & Gentile '
'P.A.'},
'response': {'containment_measures': 'Yes',
'third_party_assistance': 'Forensic security firm engaged'},
'title': 'Williams Accountancy Corporation Data Breach',
'type': 'Data Breach'}