---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-24-039746"
form_type: "8-K"
ticker: "ONT"
cik: "0001643615"
company_name: "Onterris, Inc."
filed_at: "2024-04-02T23:59:59+00:00"
generated_at: "2026-06-04T03:34:45.461489+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Montrose acquires ETA and raises 2024 revenue/EBITDA guidance

## Summary
- Acquired Engineering & Technical Associates (ETA), a Process Safety Management leader; joins Assessment, Permitting & Response segment.
- 2024 revenue guidance raised to $690-740M from $675-725M; Adjusted EBITDA guidance raised to $95-100M from $90-95M.
- Acquisition expected to be highly additive to existing EHS&S advisory offerings; no deal terms disclosed.
- Management cites strong organic performance and cross-selling execution for improved outlook.

## SEC filing metadata
- accession: 0000950170-24-039746
- form_type: 8-K
- ticker: ONT
- cik: 0001643615
- company_name: Onterris, Inc.
- filed_at: 2024-04-02T23:59:59+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1643615/000095017024039746/0000950170-24-039746-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1643615/000095017024039746/meg-20240402.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-24-039746
- JSON: https://secwatch.observer/filing/0000950170-24-039746.json
- Plain text: https://secwatch.observer/filing/0000950170-24-039746.txt

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