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.