Definitive Healthcare Reports Financial Results for Third Quarter 2026

Third Quarter Revenue Within Guidance Range; Profit Surpasses Expectations

Framingham, MA (November 5, 2026) – Definitive Healthcare Corp. (“Definitive Healthcare” or the “Company”) (Nasdaq: DH), an industry leader in healthcare market data and analytics, today announced financial results for the quarter ended September 30, 2026.

Third Quarter 2026 Financial Highlights:

“Since joining Definitive, I’ve been focused on listening to our customers and our employees,” said Clay Ritchey, CEO of Definitive Healthcare. “What I’ve heard confirms my belief in the strength of our position in the market, and it has also shown me where we can execute better. This quarter’s results demonstrate the underlying health of the business and a solid foundation to build upon.”

Recent Business and Operating Highlights:

Customer Wins

In the third quarter, Definitive Healthcare continued to win new logos and expansion opportunities across all end-markets, by providing the data, insights and integrations that drive their critical business use cases. Customer wins for the quarter included:

Financial Guidance and Conference Call

As previously announced on September 2, 2026, the Special Committee of the Board of Directors, consisting solely of independent and disinterested directors, received a non-binding indication of interest from Advent International, L.P. (“Advent”) to acquire all outstanding shares of the Company’s Class A common stock and all outstanding limited liability company interests of AIDH TopCo, LLC, in each case, not already owned by Advent or Jason Krantz, the Company’s founder and Executive Chairman. In light of this development, Definitive Healthcare will not provide financial guidance or host a conference call to discuss its third-quarter 2026 financial results.

About Definitive Healthcare

Definitive Healthcare is a data and analytics company focused on the business side of healthcare. The healthcare market is complex — our data makes it clearer. We cut through the noise to deliver the insights that healthcare organizations and companies need to make smarter, faster, more strategic decisions. Because when our customers succeed, healthcare gets better for everyone. Learn more at definitivehc.com.

Forward-Looking Statements

This press release includes forward-looking statements that reflect our current views with respect to future events and financial performance. Such statements are provided under the “safe harbor” protection of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include all statements that do not relate solely to historical or current facts, and can generally be identified by words or phrases written in the future tense and/or preceded by words such as “likely,” “will,” “should,” “may,” “anticipates,” “intends,” “plans,” “seeks,” “believes,” “estimates,” “expects,” “continues,” “assumes,” “would,” “potentially” or similar words or variations thereof, or the negative thereof, references to future periods, or by the inclusion of forecasts or projections, but these terms are not the exclusive means of identifying such statements. Examples of forward-looking statements include, but are not limited to, statements we make regarding our outlook, financial guidance, the benefits of our healthcare commercial intelligence solutions, our overall future prospects, customer behaviors and use of our solutions, the market, industry and macroeconomic environment, our plans to improve our operational and financial performance and our business, our ability to execute on our plans, expectations regarding the non-binding acquisition proposal submitted by Advent or any alternatives thereto, customer growth, including our upsell and cross-sell opportunities, and our ability to successfully transition executive leadership.

Forward-looking statements in this press release are based on our current expectations and assumptions regarding our business, the economy and other future conditions. Because forward-looking statements relate to the future, by their nature, they are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict. As a result, our actual results may differ materially from those contemplated by the forward-looking statements. Important factors that could cause actual results to differ materially from those in the forward-looking statements include the following: global geopolitical tension and difficult macroeconomic conditions; actual or potential changes in international, national, regional and local economic, business and financial conditions, including tariffs, sanctions, trade barriers, recessions, fluctuating inflation, high interest rates, volatility in the capital markets and related market uncertainty; uncertainties as to whether we enter into any transaction with Advent or any other party, and, if so, the timing and our ability to realize the anticipated benefits thereof, and the effects of any of the foregoing on relationships with employees, clients or other business partners; our inability to acquire new customers and generate additional revenue from existing customers; our inability to generate sales of subscriptions to our platform or any decline in demand for our platform and the data we offer; the competitiveness of the market in which we operate and our ability to compete effectively; the failure to maintain and improve our platform, or develop new modules or insights for healthcare commercial intelligence; the inability to obtain and maintain accurate, comprehensive or reliable data, which could result in reduced demand for our platform; the loss of our access to our data providers; the failure to respond to advances in healthcare commercial intelligence; an inability to attract new customers and expand subscriptions of current customers; our ability to successfully transition executive leadership, including

any disruptions to our business and uncertainty among our clients, employees and investors as a result of our Chief Executive Officer transition; and the possibility that our security measures are breached or unauthorized access to data is otherwise obtained.

Additional factors or events that could cause our actual performance to differ from these forward-looking statements may emerge from time to time, and it is not possible for us to predict all of them. Should one or more of these risks or uncertainties materialize, or should any of our assumptions prove incorrect, our actual financial condition, results of operations, future performance and business may vary in material respects from the performance projected in these forward-looking statements.

For additional discussion of factors that could impact our operational and financial results, refer to our Quarterly Report on Form 10-Q for the three months ended September 30, 2026 that will be filed following this earnings release, as well as our Current Reports on Form 8-K and other subsequent SEC filings, which are or will be available on the Investor Relations page of our website at ir.definitivehc.com and on the U.S. Securities and Exchange Commission (“SEC”) website at www.sec.gov.

All information in this press release speaks only as of the date on which it is made. We undertake no obligation to publicly update this information, whether as a result of new information, future developments or otherwise, except as may be required by law.

Website

Definitive Healthcare intends to use its website as a distribution channel of material company information. Financial and other important information regarding the Company is routinely posted on and accessible through the Company’s website at definitivehc.com. Accordingly, you should monitor the investor relations portion of our website at ir.definitivehc.com in addition to following our press releases, SEC filings, and public conference calls and webcasts. In addition, you may automatically receive email alerts and other information about the Company when you enroll your email address by visiting the “Email Alerts” section of our investor relations page at ir.definitivehc.com.

Non-GAAP Financial Measures

This earnings release contains financial measures that have not been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”), including Unlevered Free Cash Flow, Adjusted EBITDA, Adjusted EBITDA Margin, Adjusted Gross Profit, Adjusted Gross Margin, Adjusted Operating Income, Adjusted Net Income and Adjusted Net Income Per Diluted Share. We believe that these supplemental non-GAAP financial measures are useful to investors because they allow for an evaluation of the Company with a focus on the performance of its core operations, including providing meaningful comparisons of financial results to historical periods and to the financial results of peer and competitor companies. Our use of these non-GAAP terms may vary from the use of similar terms by other companies in our industry and accordingly may not be comparable to similarly titled measures used by other companies and are not measures of performance calculated in accordance with GAAP. Our presentation of these non-GAAP financial measures is intended as supplemental measures of our performance that are not required by, or presented in accordance with, GAAP. These non-GAAP financial measures should not be considered as alternatives to loss from operations, net loss, earnings per share, or any other performance measures derived in accordance with GAAP or as measures of operating cash flows or liquidity. A reconciliation of GAAP to non-GAAP results has been provided in the financial statement tables included at the end of this press release. In evaluating our non-GAAP financial measures, you should be aware that in the future, we may incur expenses similar to those eliminated in these presentations.

These non-GAAP financial measures are not required by or prepared in accordance with GAAP. These are supplemental financial measures of our performance and should not be considered substitutes for cash provided by operating activities, loss from operations, net loss, net income margin, gross profit, gross margin, or any other measure derived in accordance with GAAP.

Reconciliations to Certain Non-GAAP Measures

Unlevered Free Cash Flow

We define Unlevered Free Cash Flow as net cash provided by operating activities less purchases of property, equipment and data assets, plus cash interest expense, and cash payments related to transaction, integration, and restructuring expenses, earnouts, and other non-core items paid in cash. Unlevered Free Cash Flow does not represent residual cash flow available for discretionary expenditures since, among other things, we have mandatory debt service requirements.

EBITDA, Adjusted EBITDA and Adjusted EBITDA Margin

We define EBITDA as earnings before debt-related costs, including interest expense (income), net, and loss on partial extinguishment of debt, income taxes and depreciation and amortization. Adjusted EBITDA is defined as EBITDA adjusted to exclude certain items of a significant or unusual nature, including other income, net, equity-based compensation, transaction, integration, and restructuring expenses, goodwill impairments and other non-core expenses. Adjusted EBITDA Margin is defined as Adjusted EBITDA as a percentage of revenue. Adjusted EBITDA and Adjusted EBITDA Margin are key metrics used by management and our board of directors to assess the profitability of our operations. We believe that Adjusted EBITDA and Adjusted EBITDA Margin provide useful information to help investors to assess our operating performance because these metrics eliminate non-core and unusual items and non-cash expenses, which we do not consider indicative of ongoing operational performance. We believe that these metrics are helpful to investors in measuring the profitability of our operations on a consolidated level.

Adjusted Gross Profit and Adjusted Gross Margin

We define Adjusted Gross Profit as gross profit excluding acquisition-related amortization and equity-based compensation costs and Adjusted Gross Margin is defined as Adjusted Gross Profit as a percentage of revenue. Adjusted Gross Profit and Adjusted Gross Margin are key metrics used by management and our board of directors to assess our operations. We exclude acquisition-related depreciation and amortization expenses as they have no direct correlation to the cost of operating our business on an ongoing basis. A small portion of equity-based compensation is included in cost of revenue in accordance with GAAP but is excluded from our Adjusted Gross Profit calculations due to its non-cash nature.

Adjusted Operating Income

We define Adjusted Operating Income as loss from operations plus acquisition-related amortization, equity-based compensation, transaction, integration, and restructuring expenses, goodwill impairments and other non-core expenses.

Adjusted Net Income and Adjusted Net Income Per Diluted Share

We define Adjusted Net Income as Adjusted Operating Income less interest expense, net, recurring income tax (provision) benefit, foreign currency (loss) gain, and tax impacts of adjustments. We define Adjusted Net Income Per Diluted Share as Adjusted Net Income divided by diluted outstanding shares.

In evaluating our non-GAAP financial measures, you should be aware that in the future we may incur expenses similar to those eliminated in these presentations.

Investor Contact:

Brian Denyeau

ICR for Definitive Healthcare

brian.denyeau@icrinc.com

646-277-1251

Media Contact:

Bethany Swackhamer
bswackhamer@definitivehc.com

Definitive Healthcare Corp.

Reconciliations of Non-GAAP Financial Measures to Closest GAAP Equivalent