One linked filing — more sources may join as they report · filed Mar 19, 2026. View entity profile → Other incidents for this victim →
incident inc_a74b6b872a7d4500 · 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; needs two dated filings.
PII · IP / system
FEDERAL
all SEC 10-K Item 1C
Earliest sighting first · deep chronology in Litigation Timeline
Apr 28, 2023 → May 1, 2023
When the intrusion reportedly occurred, per the linked filings
Apr 28, 2023
Reported by SEC 10-K Item 1C filing
TECOGEN Inc. disclosed a ransomware attack on its computer network occurring on April 28, 2023, in its 10-K Item 1C. The company states the network returned to full operation on May 1, 2023, following remediation. The filing highlights reliance on third-party consultants for risk management and incident response but does not specify the scope of data exfiltration or the identity of the threat actor.
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.