One linked filing — more sources may join as they report · filed Oct 4, 2013. View entity profile → Other incidents for this victim →
incident inc_405cd658eb434663 · 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.
Government ID · Identity (basic)
CA
all State AG
Earliest sighting first · deep chronology in Litigation Timeline
Sep 13, 2013
When the intrusion reportedly occurred, per the linked filings
Massachusetts Mutual Life Insurance Company reported a data breach to the California Attorney General on September 13, 2013. The filing indicates the breach occurred on September 13, 2013. The attached notice samples suggest that Social Security Numbers and basic identity information were potentially compromised. No specific attack vector, affected count, or discovery date is provided in the public filing summary.
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.