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Leak SiteState AGConfirmed7 filings · 4 statesLifecycle stage 2 of 3: ConfirmedUnverified claimConfirmedEnforcedrhysidahigh sensitivity
Merged incident · 7 filings

CYTEK BIOSCIENCES, INC. — November 2025 breach

Clustered 7 filings across 5 jurisdictions · filing window Nov 1, 2025 → Jan 25, 2026. View entity profile → Other incidents for this victim →

⚠ 2 cross-filing discrepancies →Merge100%

Determination

Confirmed

Members

7 filings

States

4

Affected · reported

331

First → last filing

Nov 1, 2025 → Jan 25, 2026

Merge confidence

100%

incident inc_ca3bee5f3f544b1d · merged by human · confidence 100%

Confirmed breach. Merged as one breach: 4 regulatory filings and 3 unverified claims. The filings describe unauthorized access. Intrusion Nov 1, 2025, discovered Nov 5, 2025 — the first regulatory filing landed 47 days later. 331 individuals reported across the linked filings. Data reported: Government ID, Identity (basic), Financial account, and 2 more. Notifications rolled out on a 85-day schedule across 4 filings beginning Nov 1, 2025. Each member filing remains the legal record for its jurisdiction.

Litigation Timing

Notification delay
47days

Discovered → first regulatory filing

Discovery variance
23days

Range of discovered_at dates across filings

Leak precedence
51days before filing

Days between the first leak-site claim and the first regulatory filing. Positive = the claim came first (public exposure before disclosure). Negative = the claim trailed the filing, so there was no pre-disclosure leak. Counts regulatory filings only — press coverage is not a regulatory disclosure.

Filing span
85days

Time between earliest and latest filing

Not recorded for this incident

Materiality delta · SEC filing delay — no SEC 8-K in this cluster.

Regulatory clocksLeak gap⏱ Leak >30dFull clock table in Litigation Timeline

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Cytek Biosciences, Inc. data breach (2025) · DisclosureLens