Onterris, Inc. · NYSE:ONT
Onterris — Q1 2026 Earnings Presentation
22 slides from Onterris's earnings presentation, May 7, 2026
Slide 1: 2026 Earnings: 1Q Results
2026 Earnings: 1Q Results May 7, 2026
Slide 2: 1Q26 Results
1Q26 Results • We delivered first quarter Adjusted EBITDA and Our team applies data-driven rigor and specialized margin consistent with our expectations, despite expertise to deliver outcomes that help protect the lower revenue, reflecting continued operating planet while enabling progress. efficien
Slide 3: Disclosures
Disclosures Statements contained herein and in the accompanying oral presentation contain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements may be ident
Slide 4: Key Updates
Key Updates © Onterris • 1Q26 Earnings • 4
Slide 5: 1Q26 Highlights
1Q26 Highlights Performance This is our first earnings call 1Q26 Revenue of $168.5M, in line 1Q26 Consolidated Adj. EBITDA 1 as Onterris, a rebrand that reflects with expectations excluding as % of revenue of 10.6%, above our evolution as an integrated environmental emergency expectations environmen
Slide 6: Reiterates Full-Year 2026 Guidance, Provides 2Q26 Outlook
Reiterates Full-Year 2026 Guidance, Provides 2Q26 Outlook $840M - $900M $125M - $130M 60%+ Maintains FY26 Maintains FY26 Consolidated Maintains FY26 Revenue Range2 Adj. EBITDA1 Range2 Cashflow Outlook2 Resilient broad-based demand outlook, Expect to achieve Consolidated Adj. Targeting OCF as a % of
Slide 7: Onterris Outlook In Partnership with Financial Times: Strong Demand For Our Services
Onterris Outlook In Partnership with Financial Times: Strong Demand For Our Services Pulse Check: Understanding Our Clients Key Takeaways From 4Q25 through 1Q26, in collaboration with the Financial • Environmental performance is tied to growth outcomes, Times’ research team1, Onterris surveyed 500 s
Slide 8: Key Long-Term Priorities On Track
Key Long-Term Priorities On Track 1 Organic Growth & Margin Expansion 2 Strong Cash Flow Generation 3 Strategic Capital Allocation Strategically allocate capital to high- Integrated platform driving resilient demand Prioritize working capital optimization and given recurring revenue, cross-selling,
Slide 9: Strategic Capital Framework
Strategic Capital Framework Organic Investments Maintain Balance Sheet Strength • Prioritize high-return investments in proprietary • Strong liquidity and cash flow generation provides technology, patents and R&D to expand applications flexibility for strategic initiatives and strengthen competitive
Slide 10: Investment Highlights
Investment Highlights International reach and diverse Uniquely integrated across environmental customer base support recurring revenue services consulting, testing and treatment and cross-selling upside Large TAM and secular tailwinds backed by Strong organic growth coupled with regulatory and corpo
Slide 11: 1Q26 Segment Results
} 1Q26 Segment Results For Planet & Progress,
Slide 12: Consulting & Treatment Segment 1Q26 Performance
Consulting & Treatment Segment 1Q26 Performance (Compared to 1Q25) Revenue Slightly Below Prior Year Period, Primarily due Q1 Revenue And Segment Adj. EBITDA ($ In Millions, % As A Percent Of Segment Revenue) to Lower Emergency Response Revenue 1Q26 1Q25 Normalize • 1Q26 Revenue of $114.6M compared
Slide 13: Measurement & Analysis Segment 1Q26 Performance
Measurement & Analysis Segment 1Q26 Performance (Compared to 1Q25) Q1 Revenue And Segment Adj. EBITDA Revenue Reflects Temporary Impact of Severe Weather ($ In Millions, % As A Percent Of Segment Revenue) Conditions in Field Services Revenue 1Q26 1Q25 Normalize • 1Q26 Revenue of $53.9M compared to $
Slide 14: Appendix
} Appendix For Planet & Progress,
Slide 15: Non-GAAP Financial Information
Non-GAAP Financial Information Brand and Resegmentation: On April 17, 2026, Montrose Environmental Group, Inc. rebranded to Onterris, Inc. Beginning in the first quarter of 2026, the Company realigned its reportable segments to reflect updates made to the organizational structure and operating model
Slide 16: Non-GAAP Financial Information (Continued)
Non-GAAP Financial Information (Continued) Management compensates for these limitations by using these measures as supplemental financial metrics and in conjunction wit h our results prepared in accordance with GAAP. We encourage investors and others to review our financial information in its entire
Slide 17: Reconciliation of Net Loss to Adjusted Net Income
Onterris, Inc. Reconciliation of Net Loss to Adjusted Net Income Three Months Ended March 31, 1) Represents amortization of intangible assets. 2026 2025 2) Represents non-cash stock-based compensation expenses related to option awards issued to employees and restricted stock grants issued to directo
Slide 18: Reconciliation of Net Loss to Consolidated Adjusted EBITDA
Onterris, Inc. Reconciliation of Net Loss to Consolidated Adjusted EBITDA Three Months Ended March 31, 1) Represents non-cash stock-based compensation expenses related to option awards issued to employees and restricted stock grants issued to directors 2026 2025 and selected employees. Net loss $ (1
Slide 19: Reconciliation of Operating Cash Flow to Free Cash Flow
Onterris, Inc. Reconciliation of Net Cash (Used In) Provided by Operating Activities to Free Cash Flow For the Three Months Ended March 31, 1) Contingent consideration and other post-closing adjustments to the purchase price to reflect differences between estimated and actual closing balance sheet 2
Slide 20: Reconciliation of Revenue to Net Service Revenue
Onterris, Inc. Reconciliation of Revenue to Net Service Revenue For the Three Months Ended March 31, 2026 2025 Revenue $ 168,518 $ 177,834 Subconsultants and non-labor direct costs (30,653) (38,598) Net Service Revenue $ 137,865 $ 139,236 © Onterris • 1Q26 Earnings • 20
Slide 21: Investing for Planet & Progress
Investing for Planet & Progress Our innovative solutions and integrated expertise deliver stronger environmental compliance and performance, generating new value for stakeholders and securing a better future for clients, communities and the ecosystems we all depend on. Thank you for supporting our m
Slide 22: Thank You
Thank You © Onterris • 1Q26 Earnings •