X0306 4 2021-12-16 0 0000275880 PARSONS CORP PSN 0001774358 Kolloway Michael Richard PARSONS CORPORATION 5875 TRINITY PARKWAY #300 CENTREVILLE VA 20120 0 1 0 0 See Remarks Common Stock 2021-12-16 4 P 0 6000 31.7373 A 30389 D Common Stock 4155.1162 I By ESOP The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $31.7125 to $31.74, inclusive. The Reporting Person undertakes to provide to the Issuer, any securityholder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth above. Includes 635 shares of Common Stock acquired pursuant to the Issuer's employee stock purchase plan on June 30, 2021. Chief Legal Officer and Secretary /s/ Michael R. Kolloway 2021-12-17