Tenable Holdings, Inc.

1. Summary of Significant Accounting Policies

Basis of Presentation and Preparation

The accompanying consolidated financial statements include the accounts of Tenable Holdings, Inc. (the "Company," "we," "us," or "our") and our wholly owned subsidiaries and have been prepared in conformity with United States generally accepted accounting principles (“GAAP”) for interim financial information. All intercompany accounts and transactions have been eliminated in consolidation.

The consolidated statements are unaudited and should be read in conjunction with the consolidated financial statements and related notes included in our 2025 Annual Report on Form 10-K ("10-K") filed with the Securities and Exchange Commission on February 27, 2026. The consolidated financial statements have been prepared on a basis consistent with the audited annual consolidated financial statements included in the 10-K and, in the opinion of management, include all adjustments of a normal recurring nature necessary to fairly state our financial position, our results of operations, and cash flows.

The results for the three and nine months ended September 30, 2026 are not necessarily indicative of the operating results expected for the year ending December 31, 2026 or any other future period.

The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ significantly from these estimates.

We operate asone operating segment. Our chief operating decision makers ("CODMs") are our Co-Chief Executive Officers. Our CODMs review financial information on a consolidated basis for purposes of making operating decisions, allocating resources and evaluating financial performance. Our CODMs review cost of revenue, sales and marketing expense, research and development expense and general and administrative expense to assess our significant segment expenses, and review income (loss) from operations and net income (loss) to assess our operating performance. Our CODMs also review total assets, as reported on our consolidated balance sheets. See our consolidated statement of operations for our significant segment expenses, income (loss) from operations and net income (loss) in the periods presented.

Our significant accounting policies are described in our 10-K. During the nine months ended September 30, 2026, there were no material changes to our significant accounting policies from those described in our 10-K.

Recently Adopted Accounting Pronouncements

In July 2025, the FASB issued ASU 2025-05 - Measurement of Credit Loss for Accounts Receivable and Contract Assets, which provides a practical expedient for the calculation of current expected credit losses for accounts receivable and contract assets, allowing entities to assume that current conditions as of the balance sheet date will persist through the forecast period. The adoption of ASU 2025-05 as of January 1, 2026 on a prospective basis had an immaterial impact on our consolidated financial statements.

Recently Issued Accounting Pronouncements

In December 2025, the FASB issued ASU 2025-10 - Government Grants (Topic 832): Accounting for Government Grants Received by Business Entities, establishing guidance on the recognition, measurement and presentation of government grants. The guidance is effective beginning January 1, 2029 on a modified prospective, modified retrospective or retrospective basis, with early adoption permitted. We are currently evaluating the impact of adopting this standard on our consolidated financial statements and disclosures.