Investor Presentaiton

Non-GAAP Financial Measures Reconciliation (a) (b) (c) (d) M&A and restructuring costs for the three and nine months ended September 30, 2023 consist of transaction costs related to the acquisition of Scibids Technology SAS ("Scibids"). M&A and restructuring costs for the three and nine months ended September 30, 2022 consist of transaction costs, integration and restructuring costs related to the acquisition of OpenSlate. Offering, IPO readiness and secondary offering costs for the three and nine months ended September 30, 2023 consist of third-party costs incurred for underwritten secondary public offerings by certain stockholders of the Company. Offering, IPO readiness and secondary offering costs for the three and nine months ended September 30, 2022 consist of third-party costs incurred for the Company's filing of a "shelf" registration statement on Form S-3. Other recoveries for the three and nine months ended September 30, 2023 consist of sublease income for leased office space. For the three and nine months ended September 30, 2022, other (recoveries) costs consist of sublease income for lease office space, offset by costs related to the departures of the Company's former Chief Operating Officer and Chief Customer Officer, impairment related to a subleased office space and costs related to the disposal of furniture for unoccupied lease office space. Other (income) expense for the three and nine months ended September 30, 2023 and September 30, 2022 consist of interest income earned on interest-bearing monetary assets, and of the impact of changes in foreign currency exchange rates. We use Adjusted EBITDA and Adjusted EBITDA Margin as measures of operational efficiency to understand and evaluate our core business operations. We believe that these non- GAAP financial measures are useful to investors for period to period comparisons of our core business and for understanding and evaluating trends in operating results on a consistent basis by excluding items that we do not believe are indicative of our core operating performance. Fourth Quarter and Full-Year 2023 Guidance: With respect to the Company's expectations under "Fourth Quarter and Full Year 2023 Guidance" above, the Company has not reconciled the non-GAAP measure Adjusted EBITDA to the GAAP measure net income in this press release because the Company does not provide guidance for depreciation and amortization expense, acquisition-related costs, interest income, and income taxes on a consistent basis as the Company is unable to quantify these amounts without unreasonable efforts, which would be required to include a reconciliation of Adjusted EBITDA to GAAP net income. In addition, the Company believes such a reconciliation would imply a degree of precision that could be confusing or misleading to investors. DV DoubleVerify 38

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