---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-166730"
form_type: "8-K"
ticker: "ONT"
cik: "0001643615"
company_name: "Onterris, Inc."
filed_at: "2026-04-21T23:59:59+00:00"
generated_at: "2026-05-15T05:07:09.572687+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "high"
source: SEC EDGAR
---

# Montrose Environmental rebrands to Onterris, Inc.; ticker changes to ONT on May 4

## Summary
- Name change to Onterris, Inc. effective April 17, 2026; no stockholder vote required.
- NYSE ticker symbol will change from MEG to ONT effective at market open on May 4, 2026.
- Rebranding unites brands including ECT2, CTEH, Enthalpy Analytical and Epic Environmental.
- CEO Vijay Manthripragada cites 'For Planet & Progress' guiding principle.

## SEC filing metadata
- accession: 0001193125-26-166730
- form_type: 8-K
- ticker: ONT
- cik: 0001643615
- company_name: Onterris, Inc.
- filed_at: 2026-04-21T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: high
- sec_items: 5.03, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1643615/000119312526166730/0001193125-26-166730-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1643615/000119312526166730/meg-20260417.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-166730
- JSON: https://secwatch.observer/filing/0001193125-26-166730.json
- Plain text: https://secwatch.observer/filing/0001193125-26-166730.txt

## Source-grounded claims
- claim_id: 23e809b0d770bcf5677636800b971891111c13ae
  claim: Onterris, Inc.: Amended certificate of incorporation to change company name from Montrose Environmental Group, Inc. to Onterris, Inc (effective 2026-04-17).
  evidence_excerpt: On April 17, 2026, Montrose Environmental Group, Inc. (the “Company”) filed with the Secretary of State of the State of Delaware an amendment to its Amended and Restated Certificate of Incorporation, as amended (the “Amendment”), to change the name of the Company from “Montrose Environmental Group, Inc.” to “Onterris, Inc.” (the “Name Change”). The Name Change and the Amendment became effective immediately upon filing.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1643615/000119312526166730/0001193125-26-166730-index.htm
- claim_id: 8496cc20d9af51fb5f4873327eef4314b88f3d3c
  claim: Onterris, Inc.: Amended bylaws to conform to and further implement the name change (effective 2026-04-17).
  evidence_excerpt: In connection with approving the Amendment, the Company’s Board of Directors (the “Board”) approved an amendment to the Company’s Amended and Restated Bylaws to conform to and further implement the Name Change, subject to and effective upon the Amendment. Accordingly, the amendment to the Bylaws became effective upon the filing of the Certificate of Amendment reflecting the Amendment with the Secretary of State of the State of Delaware on April 17, 2026.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1643615/000119312526166730/0001193125-26-166730-index.htm

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