Clustered 3 filings across 2 jurisdictions · filing window Jun 25, 2021 → Jul 29, 2021. View entity profile → Other incidents for this victim →
incident inc_67d3962e0a2445d5 · merge_method deterministic · confidence 100%
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.
Health (basic) · Identity (basic)
FEDERAL MT
HHS OCR · State AG
Earliest sighting first · deep chronology in Litigation Timeline
Jan 20, 2021
When the intrusion reportedly occurred, per the linked filings
Guidehouse reported a data breach to the Montana Attorney General. The breach was reported on 2021-06-25. The breach occurred on 1/20/2021. 2 Montana residents were affected.
Affected (this filing): 2
Guidehouse, a business associate, reported a cyber-attack on its secure file transfer device that affected 91,331 individuals. The breach, reported to HHS on 2021-07-15, compromised protected health information including names, dates of birth, diagnoses, conditions, and claims information. In response, Guidehouse applied a critical patch to mitigate the vulnerability, discontinued the compromised device, and transitioned to a different network.
Affected (this filing): 91,331
Guidehouse reported a data breach to the Montana Attorney General. The breach was reported on 2021-07-29. The breach occurred on 3/23/2021. 1 Montana residents were affected.
Affected (this filing): 1
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.