INVESTOR PRESENTATION SEPTEMBER 2020 FORWARD LOOKING STATEMENTS - PowerPoint PPT Presentation

INVESTOR PRESENTATION SEPTEMBER 2020

FORWARD LOOKING STATEMENTS The statements contained in this presentation that are not purely historical are forward-looking statements. Our forward- looking statements include, but are not limited to, statements regarding our or our management team’s expectations, hopes, beliefs, intentions or strategies regarding the future. The information included in this presentation in relation to Atlas has been provided by Atlas and its management team, and forward- looking statements include statements relating to Atlas’ management team’s expectations, hopes, beliefs, intentions or strategies regarding the future. In addition, any statements that refer to projections, forecasts or other characterizations of future events or circumstances, including any underlying assumptions, are forward- looking statements. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intends,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “would” and similar expressions m ay identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. The forward-looking statements contained in this presentation are based on our current expectations and beliefs concerning future developments and their potential effects on us. There can be no assurance that future developments affecting us will be those that we have anticipated. These forward-looking statements involve a number of risks, uncertainties (some of which are beyond our control) or other assumptions that may cause actual results or performance to be materially different from those expressed or implied by these forward-looking statements. These risks and uncertainties include, but are not limited to: (1) the ability to maintain the listing of the Company’s shares of Class A common stock and warrants on Nasdaq; (2) the ability to recognize the anticipated benefits of the business combination or acquisitions, which may be affected by, among other things, competition, the ability of the Company to grow and manage growth profitably, maintain relationships with customers and suppliers and retain management and key employees; (3) costs related to the business combination and acquisitions; (4) changes in applicable laws or regulations; (5) the possibility that the Company may be adversely affected by other economic, business, and/or competitive factors; and (6) other risks and uncertainties indicated from time to time in the Company’s filings with the U.S. Securities and Exchange Commission, including those under “Risk Factors” therein. 2

PRESENTERS Joe Boyer David Quinn Chief Executive Officer Chief Financial Officer 30+ years of experience 25+ years of experience in the construction, engineering and Oversaw the delivery of infrastructure technical services industries planning, engineering, architecture, construction management, Previously served in Senior environmental consulting and Executive roles at the Shaw Group program management services as and Atkins North America, most CEO, Atkins North America recently in Chief Financial Officer and Chief Operating Officer capacities. Previously held the position of President of Shaw Environmental & Infrastructure’s Federal division 3

TABLE OF 1 OVERVIEW CONTENTS 2 INVESTMENT HIGHLIGHTS 3 KEY FINANCIALS 4

A LEADING NATIONAL TECHNICAL SERVICES PLATFORM Specialized provider of testing, inspection, environmental and engineering services to support and maintain critical infrastructure ATLAS OVERVIEW ESSENTIAL PROVIDER OF MISSION CRITICAL SERVICES TESTING, INSPECTION & $464M 17.5% $621M ENVIRONMENTAL CONSULTING Gross Adj. EBITDA Backlog Materials Engineering & Testing Revenue 1 Margin 1,2 Environmental Services Construction Quality Assurance HIGH QUALITY CUSTOMER AND WORK MIX Disaster Response & Recovery 9,000+ Annual 90% Time & Materials 70% Existing Structures Customers ENGINEERING, PLANNING & DESIGN Engineering & Design Services 50,000+ Annual <$10k+ Average Projects Project Size Program Management Construction Support Services 1. Based on LTM Q2 2020. 2. Adj. EBITDA Margin calculated as Adjusted EBITDA / Net Revenues. Adj. EBITDA and Net Revenues are not financial measures determined in accordance with GAAP. For definitions of Net Revenues and Adjusted EBITDA and reconciliations to their most directly comparable financial measures calculated and presented in accordance with GAAP please see the appendix included herewith. 5

WHO WE ARE Values-Driven Approach Life Heart We enhance quality of life. We As our hallmarks, we act with value people and safety above compassion, empathy and all else. respect. VISION ION We strive to be the most sought-after Trust Mastery infrastructure and environmental solutions brand, known for our unique values-driven We work together as partners, Always striving for the highest approach and brought to life by the doing what we say with full quality, we ensure greatness industry’s most exceptional people. accountability. inspires all our work. 6

PURPOSE BUILT PLATFORM A Modern Approach Backed by a Legacy of Excellence Forming the Establishing Executing the Creating Completed Strategy the Platform Atlas Playbook National Scale Public Listing 2016 2017 2018 2019 2020 National Scale Platform Acquired three Created the Atlas Integration of platform Merger with ATC Acquisition of Long regional market playbook and and cross-selling Group Services Engineering, Alta leaders in Vista 1 & WesTest 1 initiated M&A jumpstarted backlog established Texas, Georgia discussions to growth national platform Completed Public and California create the platform Listing Nasdaq: ATCX 1 Alta Vista & WesTest acquisitions 7 expected to close by end of 2020

ROBUST FUNDAMENTALS SUPPORT VALUATION UPSIDE Strong Growth Profile 1,2 Enterprise Value / 2020 Adj. EBITDA Versus Peers 4,5,9 2019 Net Revenue Growth Versus Peers 15.6x 25% 14.4x 13.2x 14% 11.2x 10.9x ATCX Key Peers Attractive Margin Dynamics 1,2 2019 Adj. EBITDA Growth Versus Peers 2019 Adj. EBITDA Margin Versus Peers 25% 17% ATCX Key Peers E&D Peers T&I Peers Professional Services Peers 12% 1. Net Revenue figures used where available and Adjusted EBITDA margin calculated as % of Net Revenue where available. 2. Net Revenue is not a financial measure determined in accordance with GAAP. For a definition of Net Revenue and a reconciliation to our most directly 7% comparable financial measure calculated and presented in accordance with GAAP, please see the Appendix included herewith. 3. Key Peers: NV5 Global, Tetra Tech, and ICF International. 4. Source: FactSet, Capital IQ and company filings as of 9/8/2020. 5. Multiples based on Enterprise Value as of 9/8/2020. Engineering & Design (“E&D”) Peers: NV5 Global, Tetra Tech, Parsons Corporation, Stantec, WSP Global, Jacobs Engineering Group and AECOM. 6. Testing & Inspection (“T&I”) Peers: Applus Services, S.A., ALS Limited, Bureau Veritas S.A., Intertek Group plc and SGS S.A. 7. 8. Professional Services Peers: Accenture plc, Booz Allen Hamilton, CGI, FTI Consulting, Huron Consulting Group and ICF International. 9. Adjusted EBITDA is not a financial measure determined in accordance with GAAP. For a definition of Adjusted EBITDA and a reconciliation to our most ATCX Key Peers ATCX Key Peers 8 directly comparable financial measure calculated and presented in accordance with GAAP, please see the Appendix included herewith.

CURRENT MARKET LANDSCAPE Non-discretionary and government-based work not materially impacted by COVID-19 NET REVENUE BY END MARKET 1 Atlas’ mission critical services support infrastructure and other essential industries 4% 6% • Transportation 36% • Government No material contracted backlog ~50% • Education projects have been cancelled Government Based • Water 38% • Commercial • Industrial Highly variable cost structure to align 15% resources with market activity ~50% No Material Government-based GOVERNMENT- COVID-19 Impact volume improved in Q2 2019 BASED Enacted cost savings to benefit 2020E by $6-8M Localized geographic work delays, ~50% Localized most notably in the PRIVATE SECTOR COVID-19 Impact Northeast and Northern California 1. Management estimates based on FY 2019. 9

TABLE OF 1 OVERVIEW CONTENTS 2 INVESTMENT HIGHLIGHTS 3 KEY FINANCIALS 10

INVESTMENT HIGHLIGHTS Provider of highly-technical, mission-critical services Entrenched long-term relationships with high quality customers base Resilient business model driven by repeatable, contracted revenue base derived mostly from non- discretionary testing and inspection projects Proven ability to execute multi-pronged growth strategy Industry leading gross margins and EBITDA margin profiles, driving substantial free cash flow Continued growth in backlog provides Atlas with one of the strongest backlog positions in the technical services space Disciplined deleveraging M&A approach 11