---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-26-057952"
form_type: "8-K"
ticker: "AMRC"
cik: "0001488139"
company_name: "Ameresco, Inc."
filed_at: "2026-08-19T20:12:35+00:00"
generated_at: "2026-08-19T20:14:16.744545+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Ameresco CFO Mark Chiplock resigns, effective September 25, 2026

## Summary
- Mark A. Chiplock to step down as EVP, CFO and Chief Accounting Officer effective Sept 25, 2026.
- Resignation to pursue other professional opportunities; no disagreement with company operations.
- Ameresco has commenced a search for a new Chief Financial Officer.

## SEC filing metadata
- accession: 0001628280-26-057952
- form_type: 8-K
- ticker: AMRC
- cik: 0001488139
- company_name: Ameresco, Inc.
- filed_at: 2026-08-19T20:12:35+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1488139/000162828026057952/0001628280-26-057952-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1488139/000162828026057952/amrc-20260817.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-26-057952
- JSON: https://secwatch.observer/filing/0001628280-26-057952.json
- Plain text: https://secwatch.observer/filing/0001628280-26-057952.txt

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