Datadog, Inc.

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Stockholders and the Board of Directors of Datadog, Inc.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Datadog, Inc. and its subsidiaries (the “Company”) as of December 31, 2025 and 2024, the related consolidated balance sheets, statements of operations, comprehensive income, stockholders' equity, and cash flows for each of the three years in the period ended December 31, 2025, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2025 and 2024, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2025, in conformity with accounting principles generally accepted in the United States of America.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the Company's internal control over financial reporting as of December 31, 2025, based on criteria established in Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 18, 2026, expressed an unqualified opinion on the Company's internal control over financial reporting.

Basis for Opinion

These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matter

The critical audit matter communicated below is a matter arising from the current-period audit of the financial statements that was communicated or required to be communicated to the audit committee and that (1) relates to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing separate opinions on the critical audit matter or on the accounts or disclosures to which they relate.

Revenue Recognition — Identification of Performance Obligations – Refer to Note 2 of the Financial Statements

Critical Audit Matter Description

As described in Note 2 to the consolidated financial statements, the Company generates revenue from the sale of subscription services contracts to customers using its cloud-based platform. Subscription services contracts with certain of the Company’s customers may include non-standard terms and conditions and promises to transfer multiple services.

Contracts with customers that contain non-standard terms and conditions and promises to transfer multiple services require significant judgment by management to identify the distinct performance obligations in the arrangement. Distinct performance obligations will be accounted for as separate performance obligations, while non-distinct services are combined with others to form a single performance obligation.

Given the complexity of the Company’s subscription services contracts with certain customers, coupled with management’s judgments involved in identifying distinct performance obligations and non-standard terms and conditions, auditing the Company’s subscription services contracts with certain customers required a high degree of auditor judgment.

How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to the Company’s subscription contracts with certain customers included, among others:

◦We tested the effectiveness of management’s controls over revenue recognition. This includes management’s controls over the identification of performance obligations and non-standard terms and conditions in subscription contracts, as well as the allocation of revenue to each performance obligation.

◦We evaluated a sample of subscription contracts with customers to determine if all the promises referred to in the contract were properly identified by management and accounted for as distinct performance obligations by performing the following:

•Obtained and read the subscription contract and independently assessed the terms of the contract to identify all promises and non-standard terms and conditions.

•For each promise identified, we evaluated whether such promise represented a distinct “performance obligation”, as prescribed by Accounting Standards Codification Topic 606, Revenue from Contracts with Customers.

•We evaluated the completeness and accuracy of the performance obligations by comparing those identified by us to those identified by management.

/s/Deloitte & Touche LLP

New York, New York

February 18, 2026

We have served as the Company's auditor since 2016.