One linked filing — more sources may join as they report · filed Dec 12, 2012. View entity profile → Other incidents for this victim →
incident inc_a6ae9ec82c7142a4 · 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.
Financial account · Identity (basic)
CA
all State AG
Earliest sighting first · deep chronology in Litigation Timeline
Nov 1, 2010
When the intrusion reportedly occurred, per the linked filings
American Express notified California cardholders that a third-party merchant's website suffered unauthorized access, exposing American Express card account numbers, cardholder names, and card expiration dates. Social Security numbers were not impacted. The breach occurred around November 1, 2010. American Express placed additional fraud monitoring on affected accounts and provided identity theft assistance resources.
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.