One linked filing — more sources may join as they report · filed Sep 13, 2012. View entity profile → Other incidents for this victim →
incident inc_4b02c47080e44b5e · 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.
PII · Financial account
CA
all State AG
Earliest sighting first · deep chronology in Litigation Timeline
Apr 2, 2012
When the intrusion reportedly occurred, per the linked filings
American Express notified customers that a merchant where they used their cards detected unauthorized access to its data files on April 2, 2012. The affected data included American Express Card account numbers, names, and expiration dates. Social Security numbers were not impacted. American Express placed additional fraud monitoring on affected cards and reminded customers they are not liable for fraudulent charges.
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.