PARSONS CORP

Evaluation of Disclosure Controls and Procedures

Our management carried out, as of December 31, 2025, with the participation of our Chief Executive Officer and our Chief Financial Officer, an evaluation of the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)). Based on that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that, as of December 31, 2025, our disclosure controls and procedures were effective to provide reasonable assurance that information required to be disclosed by us in reports we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC rules and forms and that information required to be disclosed by us in the reports we file or submit under the Exchange Act is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

Management’s Annual Report on Internal Control Over Financial Reporting

Management is responsible for establishing and maintaining for the Company adequate internal control over financial reporting, as defined in Rule 13a-15(f) under the Exchange Act. Management, with the participation of its Chair and Chief Executive Officer (principal executive officer) and Chief Financial Officer (principal financial officer), has assessed the effectiveness of the Company’s internal control over financial reporting as of December 31, 2025 based on the framework established in “Internal Control—Integrated Framework,” issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework). Based on this assessment, management has concluded that the Company’s internal control over financial reporting was effective as of December 31, 2025.

The Company’s independent registered public accounting firm, PricewaterhouseCoopers LLP, which audited the Company’s consolidated financial statements included in this Annual Report on Form 10-K, also audited the effectiveness of our internal control over financial reporting as of December 31, 2025, as stated in their audit report included in this Annual Report on Form 10-K.

Consistent with the guidance issued by the Securities and Exchange Commission Staff, management has excluded TRS Group, Inc. ("TRS"), Chesapeake Technology International, Corp ("CTI"), and Applied Sciences Consulting, Inc. ("ASC") from its assessment of internal controls over financial reporting as of December 31, 2025. TRS Group is a wholly owned subsidiary, which we acquired on January 31, 2025, Chesapeake Technology International is a wholly owned subsidiary, which we acquired on June 30, 2025, and Applied Science Consulting is a wholly owned subsidiary, which we acquired on October 1, 2025, all combined, have total assets and revenue of 0.8% and 1.1%, respectively of the related consolidated financial statement amounts as of and for the year ended December 31, 2025.

Changes in Internal Control Over Financial Reporting

There have been no changes in our internal control over financial reporting, as defined in Rules 13a-15(f) and 15d-15(f) of the Securities Exchange Act of 1934, that occurred during the quarter ended December 31, 2025 that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.