One linked filing — more sources may join as they report · filed Mar 30, 2026. View entity profile → Other incidents for this victim →
incident inc_3b9c8d20fb654656 · 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; needs two dated filings.
FEDERAL
all SEC 10-K Item 1C
Earliest sighting first · deep chronology in Litigation Timeline
Domtar Corporation (CIK 0001381531) filed its 10-K on March 30, 2026. The filing contains no Item 1C disclosure of a cybersecurity incident. No unauthorized access, data exfiltration, or material impact from a cyber event is reported.
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.