TKH Group Reports Data Breach Impacting Sensitive Personal Information
TKH Group, a provider of accounting, tax preparation, payroll, and investment services, disclosed a data breach that may have exposed sensitive personal information. On or around September 21, 2025, the company detected unauthorized access to its internal network, prompting an investigation.
The breach potentially compromised a range of personal data, including names, Social Security numbers, addresses, dates of birth, financial and banking details, and government-issued IDs (such as driver’s licenses). The exact information exposed varies by individual.
After completing its review, TKH Group began notifying affected individuals on January 15, 2026, via mailed breach notification letters. The notices include details on the specific data impacted and offer complimentary credit monitoring services to those affected. The breach report was filed with the Attorney General of Maine, where additional documentation is available.
Source: https://straussborrelli.com/2026/01/20/tkh-group-data-breach-investigation/
TKH Group cybersecurity rating report: https://www.rankiteo.com/company/tkh-group-n.v.
"id": "TKH1768941587",
"linkid": "tkh-group-n.v.",
"type": "Breach",
"date": "9/2025",
"severity": "85",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"{'affected_entities': [{'customers_affected': 'Unknown',
'industry': 'Accounting, Tax Preparation, Payroll, and '
'Investment Services',
'name': 'TKH Group',
'type': 'Company'}],
'attack_vector': 'Unauthorized Access',
'customer_advisories': 'Complimentary credit monitoring services offered to '
'affected individuals',
'data_breach': {'personally_identifiable_information': 'Yes',
'sensitivity_of_data': 'High',
'type_of_data_compromised': ['Names',
'Social Security numbers',
'Addresses',
'Dates of birth',
'Financial and banking details',
'Government-issued IDs']},
'date_detected': '2025-09-21',
'date_publicly_disclosed': '2026-01-15',
'description': 'TKH Group, a provider of accounting, tax preparation, '
'payroll, and investment services, disclosed a data breach '
'that may have exposed sensitive personal information. '
'Unauthorized access to its internal network was detected on '
'or around September 21, 2025, prompting an investigation. The '
'breach potentially compromised personal data, including '
'names, Social Security numbers, addresses, dates of birth, '
'financial and banking details, and government-issued IDs. The '
'company began notifying affected individuals on January 15, '
'2026, and offered complimentary credit monitoring services.',
'impact': {'data_compromised': 'Sensitive personal information including '
'names, Social Security numbers, addresses, '
'dates of birth, financial and banking '
'details, and government-issued IDs',
'identity_theft_risk': 'High',
'payment_information_risk': 'High',
'systems_affected': 'Internal network'},
'investigation_status': 'Completed',
'references': [{'source': 'Attorney General of Maine'}],
'regulatory_compliance': {'regulatory_notifications': ['Attorney General of '
'Maine']},
'response': {'communication_strategy': 'Mailed breach notification letters to '
'affected individuals'},
'title': 'TKH Group Data Breach Impacting Sensitive Personal Information',
'type': 'Data Breach'}