---
schema_version: "secwatch.filing_event.v1"
accession: "0001537435-26-000027"
form_type: "8-K"
ticker: "TGEN"
cik: "0001537435"
company_name: "TECOGEN INC."
filed_at: "2026-04-08T23:59:59+00:00"
generated_at: "2026-05-15T06:53:21.173350+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.2
calibrated_materiality_score: 0.2
confidence: "high"
source: SEC EDGAR
---

# Tecogen extends Advisory Agreement with John N. Hatsopoulos through March 2028

## Summary
- Advisory Agreement term extended to March 31, 2028.
- Original agreement dated January 18, 2018, amended in 2019 and 2023.
- Unanimous Board approval on April 7, 2026.
- No changes to other terms of the agreement disclosed.

## SEC filing metadata
- accession: 0001537435-26-000027
- form_type: 8-K
- ticker: TGEN
- cik: 0001537435
- company_name: TECOGEN INC.
- filed_at: 2026-04-08T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.2
- calibrated_materiality_score: 0.2
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1537435/000153743526000027/0001537435-26-000027-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1537435/000153743526000027/tgen-20260408.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001537435-26-000027
- JSON: https://secwatch.observer/filing/0001537435-26-000027.json
- Plain text: https://secwatch.observer/filing/0001537435-26-000027.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.