Parsons Corporation (NYSE:PSN) Q3 2023 Earnings Conference Call November 1, 2023 8:00 AM ET Company Participants Dave Spille - Senior Vice President of Investor Relations Carey Smith - Chair, President and Chief Executive Officer Matt Ofilos - Chief Financial Officer Conference Call Participants Bert Subin - Stifel Tobey Sommer - Truist Cai von Rumohr - TD Cowen Louie DiPalma - William Blair Josh Sullivan - The Benchmark Company Noah Poponak - Goldman Sachs Sheila Kahyaoglu - Jefferies Mariana Perez Mora - ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-07782 Parsons Corporation (Exact Name of Registrant as Specified in its Charter) Delaware 95-3232481 (State or other jurisdic ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-07782 Parsons Corporation (Exact Name of Registrant as Specified in its Charter) Delaware 95-3232481 (State or other jurisdiction ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-07782 Parsons Corporation (Exact Name of Registrant as Specified in its Charter) Delaware 95-3232481 (State or other jurisdiction ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 001-07782 PARSONS CORPORATION (Exact name of Registrant as Specified in Its Charter) Delaware 95-3232481 (State or other jurisdiction of ...