Slide 1: 2026 Earnings: 2Q Results
2026 Earnings: 2Q Results August 5, 2026
Slide 2: 2Q26 Results
2Q26 Results • We remain committed to achieving our long-term Our team applies data-driven rigor and specialized goals and are continuing to execute against the expertise to deliver outcomes that help protect the priorities within our control, including serving our planet while enabling progress. cl
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: Disclosures
Disclosures Forward-looking statements speak only as of the date on which they are made and we undertake no obligation to update any forward-looking statement to reflect future events, developments or otherwise, except as may be required by applicable law. Investors are referred to the Onterris fili
Slide 5: Key Updates
Key Updates © Onterris • 2Q26 Earnings • 5
Slide 6: 2Q26 Financial Summary
2Q26 Financial Summary Despite Lower Revenue, Margin Improved Financial 2Q26 Highlights (comparisons to 2Q25) • 2Q26 revenue of $186.7M, a decrease of $47.9M, primarily due to historically low environmental emergency response and related recovery services • Consolidated Adjusted EBITDA1 as a percent
Slide 7: Updated FY26 Revenue Guidance $740M – $790M
Updated FY26 Revenue Guidance FY26 Revenue Guidance* ($ in millions) $740M – $790M $840 to $900 • Pass-through revenue (revenue generated on subcontractor and non-labor direct costs, PTR) in FY26 expected $740 significantly below historical levels ($35) to $790 o FY26 expect lower PTR of $35M to $55
Slide 8: FY26 Consol. Adj. EBITDA & Margin Expected to Exceed FY25
FY26 Consol. Adj. EBITDA1 & Margin Expected to Exceed FY25 FY26 Consol. Adj. EBITDA1 Guidance* $117M - $120M ($ in millions) $125 to $130 $117 • Expect 4th consecutive year of margin $5.5 to $120 expansion ($4.5) o Expect Consol. Adj. EBITDA1 as a % of FY26 ($10.0) revenue of ~15.5% – 300+ bps incre
Slide 9: Capital Framework
Capital Framework Maintain Balance Sheet Strength Organic Investments • Expect to generate $70M to $80M in operating • Prioritize high-return investments in proprietary cash flow in 2H26 technology, patents and R&D to expand applications and strengthen competitive • Expect to end FY26 with leverage
Slide 10: Investment Highlights
Investment Highlights International reach and diverse Uniquely integrated across environmental customer base support recurring revenue services consulting, testing and treatment and cross-selling upside Large TAM and secular tailwinds backed by Strong organic growth coupled with regulatory and corpo
Slide 11: 2Q26 and 1H26 Segment Results
2Q26 and 1H26 Segment Results
Slide 12: Consulting & Treatment Segment 2Q26 Performance
Consulting & Treatment Segment 2Q26 Performance (Compared to 2Q25) Growth in Consulting Services offset by Historically Low 2Q Revenue and Segment Adj. EBITDA Environmental Emergency Response Revenue ($ in millions, % as a percent of segment revenue) • 2Q26 Revenue of $125.6M compared to $171.7M in
Slide 13: Consulting & Treatment Segment 1H26 Performance
Consulting & Treatment Segment 1H26 Performance (Compared to 1H25) Growth in Consulting Services offset by Historically Low 1H Revenue and Segment Adj. EBITDA Environmental Emergency Response Revenue ($ in millions, % as a percent of segment revenue) • 1H26 Revenue of $240.2M compared to $290.6M Rev
Slide 14: Measurement & Analysis Segment 2Q26 Performance
Measurement & Analysis Segment 2Q26 Performance (Compared to 2Q25) 2Q Revenue and Segment Adj. EBITDA Lab Testing Growth offset by Field Service Decline ($ in millions, % as a percent of segment revenue) • 2Q26 Revenue of $61.1M compared to $62.8M, primarily due to Revenue 2Q26 2Q25 Normalize o Lab
Slide 15: Measurement & Analysis Segment 1H26 Performance
Measurement & Analysis Segment 1H26 Performance (Compared to 1H25) 1H Revenue and Segment Adj. EBITDA Revenue Reflects 1Q26 Weather Impact ($ in millions, % as a percent of segment revenue) • 1H26 Revenue of $115.0M compared to $121.8M, primarily due to Revenue 1H26 1H25 Normalize o Decrease in fiel
Slide 16: Appendix
) Appendix For Planet & Progress,
Slide 17: 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 18: 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 with our results prepared in accordance with GAAP. We encourage investors and others to review our financial information in its entiret
Slide 19: Reconciliation of Net Income (Loss) to Adjusted Net Income
Onterris, Inc. 1) Represents non-cash stock-based compensation expenses related to Reconciliation of Net Income (Loss) to Adjusted Net Income option awards issued to employees and restricted stock grants issued to directors and selected employees. 2) Includes financial and tax diligence, consulting,
Slide 20: Reconciliation of Net Income (Loss) to Consolidated Adjusted EBITDA
Onterris, Inc. Reconciliation of Net Income (Loss) to Consolidated Adjusted EBITDA Three Months Ended June 30, Six Months Ended June 30, 2026 2025 2026 2025 Net income (loss) $ 1,366 $ 18,356 $ (11,324) $ (1,003) Interest expense 5,471 4,768 10,937 9,833 Income tax expense 346 988 2,649 3,859 Deprec
Slide 21: Reconciliation of Revenue to Net Service Revenue
Onterris, Inc. Reconciliation of Revenue to Net Service Revenue For the Three Months Ended June 30, For the Six Months Ended June 30, 2026 2025 2026 2025 Revenue $ 186,661 $ 234,543 $ 355,179 $ 412,377 Subconsultants and non-labor direct costs (36,178) (63,007) (66,831) (101,605) Net Service Revenue
Slide 22: 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 23: Thank You
Thank You © Onterris • 2Q26 Earnings • 23