---
schema_version: "secwatch.filing_event.v1"
accession: "0001537435-25-000111"
form_type: "8-K"
ticker: "TGEN"
cik: "0001537435"
company_name: "TECOGEN INC."
filed_at: "2025-07-28T23:59:59+00:00"
generated_at: "2026-05-18T00:15:13.888419+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# Tecogen separates CEO/CFO roles; appoints Roger Deschenes as CFO and Treasurer

## Summary
- Dr. Abinand Rangesh resigns as CFO/Treasurer, remains CEO and director.
- Roger Deschenes, current CAO, appointed CFO/Treasurer; base salary raised to $180,000.
- Board grants equity awards: Rangesh $600k, Deschenes $200k, Whiting $200k, Lafaille $200k.
- Rangesh authorized to issue up to $200k in stock options to non-executive employees.

## SEC filing metadata
- accession: 0001537435-25-000111
- form_type: 8-K
- ticker: TGEN
- cik: 0001537435
- company_name: TECOGEN INC.
- filed_at: 2025-07-28T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 5.02, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1537435/000153743525000111/0001537435-25-000111-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1537435/000153743525000111/tgen-20250724.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001537435-25-000111
- JSON: https://secwatch.observer/filing/0001537435-25-000111.json
- Plain text: https://secwatch.observer/filing/0001537435-25-000111.txt

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