Data Breach Notifications

Entity Information

  • Type of Organization: Other Commercial
  • Entity Name: Cytek Biosciences, Inc.
  • Street Address: 47215 Lakeview Boulevard
  • City: Fremont
  • State, or Country if outside the US: CA
  • Zip Code: 94538

Submitted By

  • Name: Michael Egan
  • Title: Partner
  • Firm name (if different than entity): Cooley LLP
  • Telephone Number: (202) 776-2249
  • Email Address: megan@cooley.com
  • Relationship to entity whose information was compromised: Outside legal counsel

Breach Information

  • Total number of persons affected (including residents): 331
  • Total number of Maine residents affected: 1
  • If the number of Maine residents exceeds 1,000, have the consumer reporting agencies been notified:
  • Date(s) Breach Occured: 11/01/2025
  • Date Breach Discovered: 11-28-2025
  • Description of the Breach:
    • External system breach (hacking)
  • Information Acquired - Name or other personal identifier in combination with:

Notification and Protection Services

  • Type of Notification: Written
  • Date(s) of consumer notification: 12/22/2025
  • Copy of notice to affected Maine residents: Cytek_Biosciences_-_Notification_Letter.pdf
  • Date of any previous (within 12 months) breach notifications:
  • Were identity theft protection services offered: Yes
  • If yes, please provide the duration, the provider of the service and a brief description of the service: 24