MARSH & MCLENNAN COMPANIES, INC. — April 2021 breach
Clustered 7 filings across 7 jurisdictions · filing window Jun 30, 2021 → Dec 30, 2021. View entity profile → Other incidents for this victim →
incident inc_34500417440146a4 · merged by deterministic · confidence 100%
Litigation Timing
SupplementalDiscovered → first regulatory filing
Range of discovered_at dates across filings
Time between earliest and latest filing
Not recorded for this incident
Leak precedence · Materiality delta · SEC filing delay — no leak-site claim in this cluster; no SEC 8-K in this cluster.
Sensitive data
identity_governmentIncident timeline
Dashed segments are unestablished, not zero — they fill in as filings merge into this incident.
Member cascade — every filing about this breach
- JUN 30MT AGMT AG noticefirst filing · 256 MT residentsauto-linkedday 0
- JUN 30NH AGNH AG notice485 NH residentsauto-linkedday 0
- JUN 30SC AGSC AG notice1,090 SC residentsauto-linkedday 0
- JUN 30CA AGCA AG noticeno count statedauto-linkedday 0
- JUN 30WA AGWA AG notice2,550 WA residentsday 0
- JUL 1OR AGOR AG noticeno count statedauto-linked+1d
- DEC 30ME AGME AG noticemost recent · 367 ME residentsauto-linked+183d
- Watching for additional filings — new sources merge into this incident automatically.
Roll-up facts — reconciled across members
- Breach window
- Apr 22, 2021 – Apr 30, 2021 MT AG
- Discovered
- Apr 26, 2021· 4d undetected MT AG + NH AG + SC AG +4
- Data types
- Financial account · Health (basic) · Identity (basic) · Government ID · PHI MT AG + NH AG + SC AG +3
- Attack vector
- Third-Party / Supply Chain MT AG
Each fact cites the member filing that establishes it; when filings conflict, every value shows with its source.
Affected residents by state
per-state reported counts
State AGs report only their own residents; teal bars show each state's reported slice.
Evidence ladder — rungs this incident occupies
No leak-site claim on record for this incident.
No press coverage linked yet.
Unlocks: discovery date, data types, affected count, compliance clock.
No SEC filing or victim statement yet.
Merge provenance
- Method
- deterministic
- Confidence
- 1.00 · above the 0.85 auto-merge floor
- Audit
- Every link edge records its method, confidence and model + prompt versions (100% is the strongest edge).
Merges are reversible — a wrong link can be detached with its audit trail intact. How merging works.
Filing velocity
Spread
183 days
Cadence
~1 / 30.5d
vs. multi-state median
22.9× slower
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. This page states only what the linked filings agree on; each filing's own account stays on its own record, linked from the timeline below.
The weekly clock on records like this one
The Disclosure Clock is a weekly briefing on what landed in the disclosure record, and the gap between the criminals' post and the regulator's filing — measured on the whole record, with the method shown.
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