Clustered 2 filings across 2 jurisdictions · filed Apr 21, 2025. View entity profile → Other incidents for this victim →
incident inc_ed0a9f16a90b4eee · merge_method deterministic · confidence 100%
Discovered → first regulatory filing
Time between earliest and latest filing
Not recorded for this incident
Discovery variance · Leak precedence · Materiality delta · SEC filing delay — no leak-site claim in this cluster; no SEC 8-K in this cluster; needs two dated filings.
MT VT
all State AG
Earliest sighting first · deep chronology in Litigation Timeline
Mar 13, 2025 → Mar 16, 2025
When the intrusion reportedly occurred, per the linked filings
Mar 16, 2025
Reported by VERMONT AG filing
Horizon Behavioral Health disclosed a ransomware incident discovered on March 16, 2025, with activity starting around March 13, 2025. The breach impacted patient demographic data (SSN, DL), clinical information, and insurance claims. Horizon engaged forensic experts, notified the FBI and CISA, and provided complimentary identity monitoring to affected individuals.
Horizon Behavioral Health reported a data breach to the Montana Attorney General. The breach was reported on 2025-04-21. The breach occurred from 3/13/2025 to 3/16/2025. 6 Montana residents were affected.
Affected (this filing): 6
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.