---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-21-288010"
form_type: "8-K"
ticker: "ONT"
cik: "0001643615"
company_name: "Onterris, Inc."
filed_at: "2021-09-30T23:59:59+00:00"
generated_at: "2026-06-29T00:24:38.520619+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Montrose Environmental Group launches 2.5M share offering at $62/share, net ~$147.6M

## Summary
- Initial 2,500,000 shares at $62.00 each; underwriters have 30-day option for 375,000 additional shares.
- Net proceeds expected ~$147.6 million after underwriting discounts; closing on October 1, 2021.
- Underwriters: J.P. Morgan, BofA Securities, William Blair; lock-up agreements for 60 days for execs and directors.
- Offering made under automatic shelf registration statement on Form S-3 (File No. 333-258730).

## SEC filing metadata
- accession: 0001193125-21-288010
- form_type: 8-K
- ticker: ONT
- cik: 0001643615
- company_name: Onterris, Inc.
- filed_at: 2021-09-30T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1643615/000119312521288010/0001193125-21-288010-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1643615/000119312521288010/d400322d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-21-288010
- JSON: https://secwatch.observer/filing/0001193125-21-288010.json
- Plain text: https://secwatch.observer/filing/0001193125-21-288010.txt

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