Fortinet, Inc.

To the stockholders and the Board of Directors of Fortinet, Inc.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Fortinet, Inc. and subsidiaries (the “Company”) as of December 31, 2025 and 2024, the related consolidated statements of income, comprehensive income, stockholders’ equity (deficit), 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 24, 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 matters communicated below are matters arising from the current-period audit of the financial statements that were communicated or required to be communicated to the audit committee and that (1) relate 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 matters below, providing separate opinions on the critical audit matters or on the accounts or disclosures to which they relate.

Revenue – Refer to Note 1 and Note 2 to the Financial Statements

Critical Audit Matter Description

The Company’s contracts with customers often include multiple performance obligations, such as hardware, software license, security subscription, technical support services, cloud and other services, which are generally capable of being distinct and accounted for as separate performance obligations. Pursuant to accounting principles generally accepted in the United States of America, the Company is required to evaluate whether each performance obligation represents goods and services that are distinct for purposes of determining the amount and timing of revenue recognition. A good or service is distinct where the customer can benefit from the product without the services and the services are separately identifiable within a contract, and the transfer of the good or service is separately identifiable from other promises in the contract. The evaluation of performance obligations can require significant judgment in certain contracts and could change the amount of revenue recognized in a given period.

We identified the evaluation of performance obligations in certain contracts as a critical audit matter because of the significant judgment management makes in evaluating such contracts and the impact of such judgment on the amount of revenue recognized in a particular period. This required a high degree of auditor judgment and an increased extent of testing.

How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to the Company's identification and evaluation of performance obligations within certain contracts and the resulting impact on the pattern and timing of revenue recognition included the following, among others:

•We assessed management’s significant accounting policies related to revenue recognition for compliance with Accounting Standards Codification 606, Revenue from Contracts with Customers.

•We evaluated the design and tested the operating effectiveness of internal controls over review of contracts, including those over the identification and evaluation of contract terms and conditions and the resulting impact on revenue recognition.

•We selected a sample of certain contracts and performed the following:

•Obtained and read the related contract documents and evaluated whether management had properly identified the performance obligations.

•Assessed management’s evaluation of the impact of the performance obligations on the pattern and timing of revenue recognition.

/s/DELOITTE & TOUCHE LLP

San Jose, California

February 24, 2026

We have served as the Company’s auditor since 2002.