X0306 4 2022-03-31 0001109357 EXELON CORP EXC 0001621713 Cheshire Marjorie Rodgers 10 S. DEARBORN STREET 54TH FLOOR CHICAGO IL 60603 1 0 0 0 Common Stock (Deferred Stock Units) 2022-03-31 4 A 0 889 43.60 A 7563 I By Exelon Directors' Deferred Stock Unit Plan Deferred Compensation - Phantom Share Equivalents 2022-03-31 4 A 0 304 47.63 A Common Stock 304 2546 D Balance includes 51 shares acquired on March 10, 2022 through automatic dividend reinvestment. In connection with the separation of Constellation Energy Corp. (Constellation) from Exelon effective February 1, 2022 (the Spin-Off), the balance of deferred stock units immediately prior to the Spin-Off was adjusted to preserve the overall value of the account balance post-Spin-Off. As a result the deferred stock unit balance was increased by an additional 1,599 units. Such adjustment is exempt from Section 16 of the Securities Exchange Act of 1934, as amended (the Exchange Act) pursuant to Rule 16a-9 under the Exchange Act. Phantom share equivalents 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. Balance also reflects 13 share equivalents accrued on February 24, 2022 through automatic dividend reinvestment. Elizabeth M. Hensen, Attorney in Fact for Marjorie Rodgers Cheshire 2022-04-04