Onterris Q3 2026 Margin Hits Record as Cash Flow Rises

Onterris Inc. (ONT) reported higher third-quarter adjusted EBITDA, a record quarterly consolidated adjusted EBITDA margin and stronger operating cash flow despite a 9.7% decline in reported revenue, as growth in core consulting and treatment services helped offset lower recovery-services revenue tied to a large prior-year emergency response.

Revenue for the quarter ended September 30 fell to $203.0 million from $224.9 million a year earlier. Net service revenue, which excludes subconsultants and non-labor direct costs, increased 1.2% to $162.5 million.

Consolidated adjusted EBITDA rose 6.7% to $35.9 million. The adjusted EBITDA margin expanded 270 basis points to 17.7% of revenue and increased 110 basis points to 22.1% of net service revenue. Onterris attributed the profitability improvement to better project execution, a favorable business mix and cost discipline.

Operating cash flow increased 46% to $40.9 million. GAAP net income was $9.0 million, compared with $8.4 million in the prior-year quarter, while net income per share attributable to stockholders rose to $0.26 from $0.24. Adjusted net income increased to $21.3 million from $14.2 million, and diluted adjusted earnings per share advanced to $0.56 from $0.36.

Consulting and Treatment offsets prior-year comparison

Consulting and Treatment revenue declined to $142.0 million from $161.9 million. The prior-year quarter included $45.4 million associated with a single environmental emergency response, creating a difficult comparison. In the latest quarter, core consulting revenue increased by $5.9 million, environmental emergency response revenue rose by $5.5 million and treatment revenue grew by $3.8 million, partially offsetting lower recovery-services revenue linked to the earlier event.

Segment adjusted EBITDA increased to $30.8 million from $29.8 million, while the margin expanded 330 basis points to 21.7%. Onterris said the improvement reflected operating efficiencies, a favorable project mix—including higher consulting and water-treatment margins—and the absence of losses from the renewables business it exited.

For the first nine months of 2026, Consulting and Treatment revenue fell to $382.2 million from $452.5 million. The 2025 period included $99.0 million from a single environmental event. Excluding that event, core consulting revenue increased by $10.6 million, driven by growth in the U.S. and Australia. Year-to-date segment adjusted EBITDA declined to $78.9 million from $83.9 million, but the margin expanded to 20.6% from 18.5%.

Measurement and Analysis pressured by field services

Measurement and Analysis revenue decreased 3.0% to $61.1 million as lower field-services revenue more than offset growth in laboratory services. Segment adjusted EBITDA fell to $16.0 million from $17.3 million, and the margin narrowed to 26.1% from 27.5%, reflecting the quarter’s project mix.

For the first nine months, segment revenue declined to $176.1 million from $184.8 million. The decrease primarily reflected a $9.6 million reduction in field-testing revenue, including the effects of adverse weather in the first quarter and certain federal and temporary regulatory waivers affecting parts of the air-testing business. Segment adjusted EBITDA fell to $41.9 million from $49.4 million, with the margin declining to 23.8% from 26.7%.

Guidance, leverage and acquisitions

Onterris said its third-quarter results were consistent with the financial expectations communicated in August 2026. The company reiterated its full-year 2026 guidance, with the guidance midpoints representing at least 150 basis points of margin expansion compared with 2025.

The company ended the quarter with $192.0 million of available liquidity, consisting of $20.1 million in cash and $171.9 million of revolver availability. Its leverage ratio declined to 2.9 times from 3.2 times at June 30, and management expects leverage of about 2.5 times at year-end, including recently completed acquisitions.

Onterris completed three tuck-in transactions in the second half of 2026. The deals expanded its ambient-air-monitoring presence in Colorado, added environmental consulting capabilities in Australia’s Northern Territory through EcOz Environmental Consultants, and strengthened laboratory capabilities in Midland, Texas, through the acquisition of Permian Basin Environmental Lab.

The presentation also highlighted uncertainty surrounding the company’s board-led strategic review, including whether its objectives will be achieved or any transaction will be completed. Other disclosed risks include economic and trade conditions, the unpredictable nature of emergency-response work, regulatory changes, customer concentration, acquisition integration, competition, staffing, cybersecurity, cost management and international operations.

Onterris, formerly Montrose Environmental Group, adopted its current name in April 2026 and realigned its reporting structure at the start of the year. The former Assessment, Permitting and Response and Remediation and Reuse operations are now combined within the Consulting and Treatment segment.