Cytek Biosciences Data Breach Lawsuit Investigation
On December 22 2025, Cytek Biosciences sent notice of a data security incident that compromised personal information belonging to eight Massachusetts residents. If you received a letter, you may be entitled to free identity-theft protection and potential compensation. Explore the facts below and learn how to protect your rights.
Key Details at a Glance
- Notice date: December 22 2025
- Entities notifying: Cytek Biosciences, Inc. (Cytek Biosciences)
- Total individuals affected: 8 (all in Massachusetts)
- Free services offered: 24 months of Experian credit monitoring and identity-protection support
Timeline of the Cytek Biosciences data breach
Cytek Biosciences conducted a forensic investigation after detecting unauthorized activity affecting employee accounts. Findings confirmed that certain personal information had been accessed. The company finalized its review and, on December 22 2025, reported the breach to the Massachusetts Attorney General and mailed consumer letters the same day.
What information was exposed?
The specific data elements varied by individual. According to the notice, the following categories were involved:
- Name and contact information (postal address, email address, phone number)
- Date of birth
- Social Security number
- Driver’s license or other government-issued ID number
- Citizenship status and signature
- Health and medical information
- Financial account and compensation information
- Cytek employee account username and password
Complimentary identity protection offered
Cytek Biosciences is providing 24 months of Experian credit monitoring and identity protection at no cost to affected individuals. The service includes:
- Credit bureau monitoring and alerts
- Identity-theft resolution support
- $1 million insurance reimbursement policy (per Experian program terms)
Enrollment instructions and your unique activation code are included in the mailed letter.
Steps you can take now
- Enroll in the free Experian services before the deadline stated in your letter.
- Review bank, credit-card, and medical statements for unfamiliar charges.
- Obtain a free annual credit report at annualcreditreport.com or 1-877-322-8228.
- Consider placing a security freeze or fraud alert with Equifax, Experian, and TransUnion.
- Report suspected identity theft to law enforcement, the Massachusetts Attorney General, or the Federal Trade Commission at ftc.gov/idtheft.
Company overview
Cytek Biosciences, Inc. (Cytek Biosciences) designs and manufactures flow cytometry instruments and reagents used in medical research.
- Website: cytekbio.com
- Headquarters: 47215 Lakeview Blvd, Fremont, California, United States
- Industry: Medical Equipment
- Founded: 1992
- Employees: 676
- Stock symbol: CTKB (NASDAQ)
- Social: LinkedIn | Facebook | X | YouTube
Frequently asked questions
I received a data breach letter from Cytek Biosciences — what should I do?
Follow the activation instructions in your letter to enroll in the free Experian credit-monitoring service, then monitor financial and medical accounts for suspicious activity.
How do I submit a claim related to the Cytek Biosciences data breach?
If unauthorized charges or identity theft occur, document your losses and consult a consumer-protection attorney to discuss potential claims. Keep your breach letter and any fraud evidence.
Am I eligible to join a lawsuit against Cytek Biosciences?
Eligibility depends on whether you suffered financial or other measurable harm. Attorneys investigating the incident can evaluate your circumstances during a free case review.
What information did the Cytek Biosciences breach expose?
Potentially exposed data includes name, contact details, Social Security number, driver’s license number, medical and financial data, and employee account credentials.
Did Cytek Biosciences offer credit monitoring, and for how long?
Yes. The company is offering 24 months of Experian credit monitoring and identity-theft protection at no cost.
How many people were affected by the Cytek Biosciences breach?
The company reported the incident affected 8 individuals, all residents of Massachusetts.
How can I get the official breach notice (PDF) for Cytek Biosciences?
You can download the Massachusetts Attorney General filing here: Official Breach Notice (PDF).
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