X0306 4 2020-03-31 0001109357 EXELON CORP EXC 0001164638 LAWLESS ROBERT J 10 SOUTH DEARBORN STREET 54TH FLOOR CHICAGO IL 60603 1 0 0 0 Common Stock (Deferred Stock Units) 2020-03-31 4 A 0 899 43.12 A 30632 I By Exelon Directors' Deferred Stock Unit Plan Common Stock 3273 D Phantom Stock Common Stock 45946 I By Constellation Deferred Compensation Plan for Non-employee Directors Deferred Compensation - Phantom Share Equivalents 2020-03-31 4 A 0 1119 36.81 A Common Stock 1119 29872 D Balance includes 261 shares acquired on March 10, 2020 through automatic dividend reinvestment. Phantom deferred stock units converted from the legacy Constellation Energy Group Inc. (CEG) Deferred Compensation Plan for Non-employee Directors to be settled in cash on a 1 for 1 basis upon the termination of the reporting person's service on the Exelon board of directors. Balance updated to reflect 404 additional stock units credited on March 10, 2020 through the dividend reinvestment feature of the plan. Phantom share equivalents acquired in the reporting person's Exelon stock fund account that is part of a multi-fund, non-qualified deferred compensation plan and that will be settled in cash on a 1 for 1 basis upon the termination of the reporting person's service on the Exelon board of directors. Balance also reflects 216 shares equivalents accrued on February 19, 2020 through automatic dividend reinvestment. Elizabeth M. Hensen, Attorney in Fact for Robert J. Lawless 2020-04-01