The Neiman Marcus Group, LLC reported a data breach to the Montana Attorney General. The breach was reported on 2021-09-30. The breach occurred from 5/1/2020 to 5/30/2020. 4,027 Montana residents were affected.
Affected (this filing): 4,027
Clustered 2 filings across 2 jurisdictions · filed Sep 30, 2021. View entity profile → Other incidents for this victim →
incident inc_3e7da5fe53b94ef9 · 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.
HI MT
all State AG
Earliest sighting first · deep chronology in Litigation Timeline
May 1, 2020
When the intrusion reportedly occurred, per the linked filings
The Neiman Marcus Group, LLC reported a data breach to the Montana Attorney General. The breach was reported on 2021-09-30. The breach occurred from 5/1/2020 to 5/30/2020. 4,027 Montana residents were affected.
Affected (this filing): 4,027
Neiman Marcus Group, LLC reported a data breach to the Hawaii Office of Consumer Protection. The office was notified on 2021/09.30. Breach type: Hackers/Unauthorized. 19,070 Hawaii residents were affected. Recovered from the Internet Archive after the notice was removed from the OCP table.
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.