X0306 4 2022-03-02 0 0000275880 PARSONS CORP PSN 0001601188 Ball George L. PARSONS CORPORATION 5875 TRINITY PARKWAY #300 CENTREVILLE VA 20120 0 1 0 0 Chief Financial Officer Common Stock 2022-03-02 4 A 0 15346 0.00 A 38738 D Common Stock 2022-03-02 4 A 0 16003 0.00 A 54741 D Common Stock 2022-03-02 4 F 0 4713 34.82 D 50028 D Common Stock 170000 I By Family Trust Common Stock 61449.812 I By ESOP Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of common stock. The RSUs will vest in three equal annual installments beginning on March 2, 2023 and have no expiration date. On January 1, 2019, the reporting person was granted an award of restricted stock units, which vest in the form of common stock based upon the Issuer's performance against certain strategic objective goals. On March 2, 2022, the Compensation Committee of the Issuer's Board of Directors determined that the strategic objective goals had been met, resulting in the vesting of these shares. These shares are held by the George L. and Coleen M. Ball Family Trust UA 01-18-2005 (the "Trust"). Mr. Ball has shared voting, investment and dispositive power over the shares held by the Trust. /s/ Michael R. Kolloway, as attorney-in-fact 2022-03-04