CYTEK BIOSCIENCES, INC.
bd_b141b6898f0871ed · schema v1 · pii pii-v1
Full breach record for CYTEK BIOSCIENCES, INC. →Threat-actor claim — not a regulatory filing
This row is a claim by the ransomware group Rhysida on its public extortion blog. It has not been validated by the victim or any regulator. Treat attribution and counts as the threat actor's assertion until a regulatory filing or victim disclosure corroborates them.
Source: Ransomware.live
Post text · scraped from the leak site
Cytek Biosciences Cytek Biosciences is a leading cell analysis solutions company founded in 1992 and headquartered in Fremont, California with global offices across North America, Europe, and Asia. Sold 0% All data was sold, stay with us, we will upload new Companies later More
J jump to incidentP pin to compareR raw source
Incident timeline — mostly unverified
? — ?
Breach window unknown
Nov 1, 2025
Claim posted
—
Corroborated · see linked filings
Compliance clocks stay unassessable until a regulatory filing lands. Dashed segments fill in automatically when corroboration arrives.
Claim → filing
—
Compliance clock
Not assessable
Linked disclosures
Why this link?Ransomware claims (2)
- Leak Siterhysidabd_eb75b2e7b9fce6802026-01-25 · +86dVerified by operator
- Leak Sitecmdorganizationbd_c1046e1115ba4f232026-01-25 · +85dVerified by operator
Regulatory filings (4) · sorted by filing gap
- Indiana State AGbd_1553fa181e3ff4fd2025-12-22 · +51dVerified
- Maine State AGbd_1ee03444beb455432025-12-22 · +51dVerified by operator
- Massachusetts State AGbd_4edcb8da3a812e572025-12-22 · +51dVerified by operator
- New Hampshire State AGbd_f10136bccf81d0972025-12-22 · +51dVerified
Filing propagation · 5 filings · 4 states
View merged incident ↗Pattern: first filing Nov 1, last Dec 22 (NH) — a 51-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?
Evidence ladder
Attacker assertion only. Establishes: claim date, group, alleged victim.
Unlocks: incident narrative, operational impact. Still no compliance clock.
Unlocks: discovery date, data types, affected count, compliance clock.
Unlocks: materiality, stated response, full audit trail. Ceiling removed.
Source ceiling
- actor name
- victim claim
- ransom/leak status
- discovery date
- materiality
- notification
- affected count
- confirmed data types
- compliance clock
The ✕ fields stay blank until a regulatory filing or victim disclosure lands.
rhysida
According to ransomware.live, Rhysida is a ransomware-as-a-service (RAAS) group that emerged in May 2023. The group utilizes a namesake ransomware through phishing attacks and Cobalt Strike to breach the targets' networks and deploy their payloads. The group threatens to publicly distribute exfiltrated data if the ransom is not paid, and it's worth mentioning that Rhysida is still in the early stages of development. The ransomware leaves PDF notes in the affected folders, instructing victims to contact the group through its portal, and payment is made via Bitcoin. After encryption, the ransomware appends the extension '.ryshida' to encrypted files. Source: https://github.com/crocodyli/ThreatActors-TTPs