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Confirmed6 filings · 4 statesUnverified claimConfirmedEnforcedinc_ransomhigh sensitivity

Merged incident · 6 filings

Pierce County Library System — April 2025 breach

Clustered 6 filings across 5 jurisdictions · filing window Apr 18, 2025 → Dec 10, 2025. View entity profile → Other incidents for this victim →

⚠ 1 cross-filing discrepancy →Merge100%

Determination

Confirmed

Members

6 filings

States

Affected · reported

340,101

First → last filing

Apr 18, 2025 → Dec 10, 2025

Merge confidence

100%

incident inc_d1c4c1e39d864e09 · merged by human · confidence 100%

Confirmed breach. Merged as one breach: 4 regulatory filings and 2 unverified claims. The filings describe unauthorized access. Intrusion Apr 15, 2025–Apr 21, 2025, discovered Oct 10, 2025 — the first regulatory filing landed 60 days later (flagged late). 340,101 individuals reported across the linked filings. Data reported: Government ID and Identity (basic). Notifications rolled out on a 236-day schedule across 4 filings beginning Apr 18, 2025. Each member filing remains the legal record for its jurisdiction.

Litigation Timing

Supplemental

Notification delay

60days

Discovered → first regulatory filing

Leak precedence

235days 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

236days

Time between earliest and latest filing

Not recorded for this incident

Discovery variance · Materiality delta · SEC filing delay — no SEC 8-K in this cluster; needs two dated filings.

Regulatory clocksLeak gap✗ Leak >180dFull clock table in Litigation Timeline

No cross-filing comparison data available for this incident.

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