**Cytek Biosciences Discloses Data Breach Exposing Sensitive Consumer and Employee Information**
On December 22, 2025, Cytek Biosciences, a provider of flow cytometry equipment and solutions, reported a data breach that compromised a broad range of sensitive information. The incident was disclosed to the Massachusetts Attorney General, revealing that at least eight state residents were affected, though the full nationwide impact remains undisclosed.
The breach exposed personally identifiable information (PII), including names, contact details, dates of birth, Social Security numbers, driver’s license and government-issued ID numbers, citizenship status, signatures, and financial account data. Additionally, protected health information (PHI), such as medical records, was accessed, along with Cytek employee account credentials.
In response, Cytek is offering affected individuals 24 months of complimentary identity protection and credit monitoring through Experian IdentityWorks, which includes daily credit report monitoring, identity restoration support, and up to $1 million in identity theft insurance. Enrollment is available until April 30, 2026, without requiring a credit card. The company has also established a dedicated support line (833-918-1243) for inquiries, operating Monday through Friday from 8 a.m. to 8 p.m. Central Time.
Given the exposure of highly sensitive data, including Social Security numbers and health records, affected individuals may consider additional protective measures, such as credit freezes or fraud alerts. The official notice provides guidance on these steps and contact details for major credit bureaus.
Source: https://www.claimdepot.com/data-breach/cytek-biosciences-2025
Cytek Biosciences cybersecurity rating report: https://www.rankiteo.com/company/cytek-biosciences
"id": "CYT1766447891",
"linkid": "cytek-biosciences",
"type": "Breach",
"date": "12/2025",
"severity": "85",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"{'affected_entities': [{'customers_affected': 'At least 8 Massachusetts '
'residents (nationwide total '
'undisclosed)',
'industry': 'Biotechnology / Flow Cytometry Equipment '
'and Solutions',
'name': 'Cytek Biosciences, Inc.',
'type': 'Corporation'}],
'customer_advisories': 'Affected individuals encouraged to enroll in identity '
'protection services and monitor accounts',
'data_breach': {'personally_identifiable_information': ['Names',
'Contact information '
'(postal address, '
'email address, phone '
'number)',
'Dates of birth',
'Social Security '
'numbers',
'Driver’s license '
'numbers',
'Government-issued ID '
'numbers',
'Citizenship status',
'Signatures',
'Financial account '
'and compensation '
'information',
'Employee account '
'usernames and '
'passwords'],
'sensitivity_of_data': 'High',
'type_of_data_compromised': ['Personally identifiable '
'information (PII)',
'Protected health information '
'(PHI)']},
'date_publicly_disclosed': '2025-12-22',
'description': 'Cytek Biosciences, Inc. disclosed a data breach that exposed '
'sensitive consumer information, including personally '
'identifiable information (PII) and protected health '
'information (PHI).',
'impact': {'data_compromised': 'Personally identifiable information (PII) and '
'protected health information (PHI)',
'identity_theft_risk': 'High',
'payment_information_risk': 'High'},
'recommendations': ['Enroll in complimentary identity protection and credit '
'monitoring services',
'Place a security freeze or fraud alert on credit files',
'Regularly review account statements and credit reports '
'for suspicious activity'],
'references': [{'source': 'Massachusetts Attorney General'}],
'regulatory_compliance': {'regulatory_notifications': 'Disclosure to '
'Massachusetts Attorney '
'General'},
'response': {'communication_strategy': 'Dedicated toll-free response line '
'(833-918-1243), official notice with '
'credit bureau instructions',
'third_party_assistance': 'Experian IdentityWorks (identity '
'protection and credit monitoring '
'services)'},
'title': 'Cytek Biosciences Data Breach',
'type': 'Data Breach'}