Key Points – Second-quarter revenue fell to $186.7 million from $234.6 million, largely because the prior-year period included $53.6 million from a major environmental emergency-response event.
Cost optimization nevertheless increased adjusted EBITDA margin to 17.1% from 16.9%. – Onterris lowered its 2026 revenue outlook to $740 million–$790 million and adjusted EBITDA outlook to $117 million–$120 million, citing weaker pass-through and emergency-response revenue plus regulatory waivers delaying air-testing work
Management still expects record adjusted EBITDA and materially stronger second-half cash flow. – The board has begun a comprehensive strategic review that may include acquisitions, other value-creating transactions or continued standalone execution; no decision or timetable has been established. – The Nasdaq’s Historic Rally Doesn’t Mean the Risk Is Gone Montrose Environmental Group (NYSE:ONT), which rebranded as Onterris Inc. on April 21, reported lower second-quarter revenue amid historically low environmental emergency-response activity, while cost optimization helped lift adjusted EBITDA margins and supported a narrower reduction in its full-year earnings outlook. Onterris reported second-quarter revenue of $186.7 million, down $47.9 million from the prior-year period. Adjusted EBITDA totaled $31.9 million, compared with $39.6 million a year earlier.
However, adjusted EBITDA margin increased to 17.1% from 16.9%, which President and Chief Executive Officer Vijay Manthripragada attributed to ongoing cost optimization. – Is AI Really Eating Software? A Wall Street Veteran Says No—Here’s Why The company noted that the second quarter of 2025 included approximately $53.6 million in revenue from a single environmental emergency-response event and subsequent recovery work. Excluding that event, Manthripragada said second-quarter 2026 revenue grew.