Form 425

Filed by Exelon Corporation

(Commission File No. 1-16169)

Pursuant to Rule 425 under the Securities Act of 1933

and deemed filed pursuant to Rule 14a-12 of the Securities Exchange Act of 1934

Subject Company: Constellation Energy Group, Inc.

(Commission File No. 1-12869)

On May 24, 2011, Exelon distributed the attached newsletter article concerning the Wolf Hollow purchase and its relation to the proposed Constellation transaction to employees of its Exelon Generation subsidiary:


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