One linked filing — more sources may join as they report · filed May 1, 2026. View entity profile → Other incidents for this victim →
incident inc_6e523a5a536140d1 · 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.
PII · Identity (basic)
MA
all State AG
Earliest sighting first · deep chronology in Litigation Timeline
Feb 28, 2025 → Mar 2, 2025
When the intrusion reportedly occurred, per the linked filings
Mar 2, 2025
Reported by MASSACHUSETTS AG filing
Berkeley Research Group (BRG), a third-party vendor for Express Scripts, experienced a data breach from Feb 28 to Mar 2, 2025. An unauthorized actor accessed BRG systems and copied personal information of Express Scripts clients. BRG contained the incident, rotated credentials, and rebuilt systems. Affected individuals received 24 months of credit monitoring via Kroll. Federal law enforcement was notified.
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.