Trading Symbol

  
Securities registered pursuant to Section 12(b) of the Act:

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| Title of each class |  | Trading Symbol(s) |  | Name of each exchange on which registered |
| EXELON CORPORATION: |  |  |  |  |
| Common Stock, without par value |  | EXC |  | The Nasdaq Stock Market LLC |
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| PECO ENERGY COMPANY: |  |  |  |  |
| Trust Receipts of PECO Energy Capital Trust III, each representing a 7.38% Cumulative Preferred Security, Series D, $25 stated value, issued by PECO Energy Capital, L.P. and unconditionally guaranteed by PECO Energy Company |  | EXC/28 |  | New York Stock Exchange |

Securities registered pursuant to Section 12(g) of the Act:

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| Title of Each Class |
| COMMONWEALTH EDISON COMPANY: |
| Common Stock Purchase Warrants (1971 Warrants and Series B Warrants) |
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Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.

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| Exelon Corporation | Yes | x |  | No | ☐ |
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| Commonwealth Edison Company | Yes | ☐ |  | No | x |
| PECO Energy Company | Yes | ☐ |  | No | x |
| Baltimore Gas and Electric Company | Yes | ☐ |  | No | x |
| Pepco Holdings LLC | Yes | ☐ |  | No | x |
| Potomac Electric Power Company | Yes | ☐ |  | No | x |
| Delmarva Power & Light Company | Yes | ☐ |  | No | x |
| Atlantic City Electric Company | Yes | ☐ |  | No | x |

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.

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| Exelon Corporation | Yes | ☐ |  | No | x |
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| Commonwealth Edison Company | Yes | ☐ |  | No | x |
| PECO Energy Company | Yes | ☐ |  | No | x |
| Baltimore Gas and Electric Company | Yes | ☐ |  | No | x |
| Pepco Holdings LLC | Yes | ☐ |  | No | x |
| Potomac Electric Power Company | Yes | ☐ |  | No | x |
| Delmarva Power & Light Company | Yes | ☐ |  | No | x |
| Atlantic City Electric Company | Yes | ☐ |  | No | x |

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ý    No  ¨Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ý    No  ¨  

