One linked filing — more sources may join as they report · filed May 19, 2017. View entity profile → Other incidents for this victim →
incident inc_9fa1accc5dc1468d · merge_method deterministic
Not recorded for this incident
Discovery variance · Leak precedence · Materiality delta · SEC filing delay · Filing span — no leak-site claim in this cluster; no SEC 8-K in this cluster; needs two dated filings.
MT
all State AG
Earliest sighting first · deep chronology in Litigation Timeline
Jan 25, 2017
When the intrusion reportedly occurred, per the linked filings
AT&T reported a data breach to the Montana Attorney General. The breach was reported on 2017-05-19. The breach occurred from 1/25/2017 to 2/20/2017. 50 Montana residents were affected.
Affected (this filing): 50
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.