🍁Vermont State AGlinked via multistate filing link · 100%
Clustered 4 filings across 4 jurisdictions · filed Nov 26, 2025. View entity profile → Other incidents for this victim →
incident inc_a9b1a9c8512141fa · merge_method llm · confidence 100%
Discovered → first regulatory filing
Range of discovered_at dates across filings
PII
Time between earliest and latest filing
Not recorded for this incident
Leak precedence · Materiality delta · SEC filing delay — no leak-site claim in this cluster; no SEC 8-K in this cluster.
ME MT NH VT
all State AG
per-filing reported counts
State AGs report only their own residents; bars show per-filing counts.
Earliest sighting first · deep chronology in Litigation Timeline
Dec 26, 2024 → Dec 27, 2024
When the intrusion reportedly occurred, per the linked filings
Dec 27, 2024
Reported by VERMONT AG, NEW HAMPSHIRE AG filings
Oct 30, 2025
Reported by MAINE AG filing
About this clustering
DisclosureLens links filings into incidents through layered matchers: deterministic rules (same source document, multistate filings of one breach, tight-window same-victim pairs), a weighted-similarity scorer for cross-source candidates, and an operator review queue for everything uncertain. Each link records its own method and confidence — shown per filing in the timeline below. The system defaults to NOT merging when uncertain, because a false merge (collapsing two unrelated breaches) is more harmful than a false split (showing related filings separately); uncertain pairs route to human review instead of auto-merging. Filing summaries shown in the timeline are AI-generated extracts — verify each against its linked source.
Horizon Healthcare RCM notified Vermont AG of a ransomware incident occurring Dec 26-27, 2024. Files were encrypted and copied. Data included names and government IDs. Horizon restored systems, had attacker delete data, and offers Kroll identity monitoring. No specific count disclosed.
Horizon Healthcare RCM reported a data breach affecting 11 Maine residents. The breach, described as an external system hacking incident, occurred on December 27, 2024, and was discovered on October 30, 2025. Affected individuals were notified on November 26, 2025, and offered 12 months of credit monitoring services through Kroll.
Affected (this filing): 11
Horizon Healthcare RCM reported a data breach to the Montana Attorney General. The breach was reported on 2025-11-26. The breach occurred from 12/26/2024 to 12/27/2024. 8 Montana residents were affected.
Affected (this filing): 8
Horizon Healthcare RCM, a revenue-cycle management provider, issued a supplemental data breach notice to the New Hampshire Attorney General on November 26, 2025. The incident involved a computer virus (ransomware) that encrypted files and resulted in unauthorized copying of patient data between December 26-27, 2024. Approximately 10 New Hampshire residents were affected. The breach involved names and other personal information. Horizon engaged Kroll for identity monitoring and implemented enhanced security measures.
Affected (this filing): 10