Onterris, Inc. (NYSE: ONT)

Montrose Environmental Group, Inc. provides environmental consulting testing and remediation services to help clients meet regulatory and sustainability requirements across the lifecycle of their projects.

The company generates revenue by offering services through its three operating segments: Assessment Permitting and Response Measurement and Analysis and Remediation and Reuse primarily under time and materials fixed price and milestone based contracts serving a diversified mix of private and public sector clients whose spending is largely non discretionary due to regulatory drivers.

The company operates through the following segments: Assessment Permitting and Response Measurement and Analysis and Remediation and Reuse.

• Assessment Permitting and Response: This segment delivers scientific advisory and consulting services for environmental assessments emergency response and recovery toxicology consulting environmental audits and permitting for current operations facility upgrades new projects decommissioning and development projects while helping clients navigate regulatory processes and manage environmental and political impacts and it generated approximately 37.0% of total revenue for the fiscal year ended December 31 2025.

• Measurement and Analysis: This segment is one of the largest providers of environmental testing and laboratory services in North America testing air water and soil for contaminant concentrations and toxicological impact offering source and ambient air testing leak detection and advanced multi media laboratory analyses and it generated approximately 29.6% of total revenue for the fiscal year ended December 31 2025.

• Remediation and Reuse: This segment provides engineering design and implementation services that treat contaminated water and remove pollutants from soil using advanced treatment technologies and it generated approximately 33.4% of total revenue for the fiscal year ended December 31 2025.

Montrose Environmental Group, Inc. competes in a highly fragmented environmental services industry where no single participant dominates. Its primary competitors include the environmental divisions of large engineering firms such as ERM Ramboll Geosyntec Exponent and WSP for assessment services SGS TRC Companies Eurofins and Pace Analytical for testing and Tetra Tech AECOM Xylem Veolia and Mead & Hunt for remediation. While the company differentiates itself through an integrated platform a focus on innovation reflected in 31 patents proprietary real time monitoring technology a nationwide service footprint and a track record of successful acquisitions that broaden its capabilities and geographic reach.

The company serves a broad customer base that includes oil and gas producers utilities local state provincial and federal government agencies engineering firms industrial manufacturers chemical companies transportation providers renewable energy developers and telecommunications operators with the majority of revenue coming from private sector clients and no single customer disclosed by name although its largest client accounted for roughly 17.8% of 2025 revenue.