One linked filing — more sources may join as they report · filed Mar 31, 2021. View entity profile → Other incidents for this victim →
incident inc_d49f328a413e45e2 · 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 20, 2021
When the intrusion reportedly occurred, per the linked filings
Memorial Sloan Kettering Cancer Center reported a data breach to the Montana Attorney General. The breach was reported on 2021-03-31. The breach occurred from 1/20/2021 to 1/22/2021. 4 Montana residents were affected.
Affected (this filing): 4
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.