One linked filing — more sources may join as they report · filed Jun 4, 2013. View entity profile → Other incidents for this victim →
incident inc_251b9c33208a4b34 · merge_method deterministic
Discovered → first regulatory filing
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.
Identity (basic) · Government ID · Financial account
CA
all State AG
Earliest sighting first · deep chronology in Litigation Timeline
May 8, 2013
When the intrusion reportedly occurred, per the linked filings
May 8, 2013
Reported by CALIFORNIA AG filing
Massachusetts Mutual Life Insurance Company inadvertently disclosed customer 401(k) retirement plan information, including names, Social Security numbers, investment elections, and account balances, to an unaffiliated third-party retirement plan service provider via email on May 8, 2013. The third party notified MassMutual and deleted the data. MassMutual offered two years of credit monitoring.
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.