X0306 4 2020-01-27 0001109357 EXELON CORP EXC 0001740087 Nigro Joseph 10 S. DEARBORN STREET 54TH FLOOR CHICAGO IL 60603 0 1 0 0 Sr. EVP & Chief Fin. Officer Common Stock 2020-01-27 4 M 0 66537 A 112310 D Common Stock 2020-01-27 4 F 0 29129 47.27 D 83181 D Common Stock 2020-01-27 4 D 0 24772 47.27 D 58409 D Restricted Stock Units 2017 0 2020-01-27 4 M 0 6186 D Common Stock 6186 0 D Restricted Stock Units 2018 0 2020-01-27 4 M 0 7173 D Common Stock 7173 7181 D Restricted Stock Units 2019 0 2020-01-27 4 M 0 5720 D Common Stock 5720 11443 D Restricted Stock Units 2020 0 2020-01-27 4 A 0 16677 A Common Stock 16677 16677 D Performance Shares 2017-2019 (stock units) 0 2020-01-27 4 A 0 47458 A Common Stock 47458 47458 D Performance Shares 2017-2019 (stock units) 0 2020-01-27 4 M 0 47458 D Common Stock 47458 0 D Common shares acquired through conversion of previously awarded and vested restricted stock units (RSUs) and performance share (stock units) under the Exelon Long Term Incentive Plan. Restricted stock unit (RSUs) award granted pursuant to the Exelon Long Term Incentive Plan. RSUs are granted annually at the Compensation and Leadership Development Committee's first meeting in January or February and vest in 1/3 increments on the dates of the Committee's January or February meetings held in the first, second, and third years after the grant date. Each RSU represents the right to receive one share of Exelon common stock. Awards accrue additional RSUs acquired through quarterly dividend reinvestment that vest on the same schedule as the underlying award. Performance share (stock unit) award granted pursuant to the Exelon Long Term Incentive Plan for the three-year performance period referenced in Column 1 based on the Compensation and Leadership Development Committee's determination of performance achieved for the period. Each performance share (stock unit) represents the right to receive one share or the economic equivalent value of one share of Exelon common stock. Performance share (stock units) awards vest immediately upon grant date. Elizabeth M. Hensen, Attorney-in-Fact for Joseph Nigro 2020-01-28