One linked filing — more sources may join as they report · filed May 3, 2023. View entity profile → Other incidents for this victim →
incident inc_325f232f782944a0 · merge_method deterministic
Discovered → first regulatory filing
Discovery to SEC materiality determination
FEDERAL
Materiality determination to SEC 8-K filing
Not recorded for this incident
Discovery variance · Leak precedence · Filing span — no leak-site claim in this cluster; needs two dated filings.
all SEC 8-K
Earliest sighting first · deep chronology in Litigation Timeline
Apr 28, 2023
When the intrusion reportedly occurred, per the linked filings
Apr 28, 2023
Reported by SEC 8-K filing
May 3, 2023
Registrant determined the incident material — starts the SEC 4-business-day clock
Tecogen Inc. disclosed a ransomware attack on April 28, 2023, initiated via a spear phishing attack through its VPN. Malware was found on two workstations; files were restored from backups by May 1, 2023. Tecogen changed passwords, audited accounts, disabled VPN pending MFA implementation, and is investigating improved security solutions.
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.