ALLEN PAUL J 4

4 · CONSTELLATION ENERGY GROUP INC · Filed Mar 14, 2012

Insider Transaction Report

Form 4

Period: 2012-03-12

CONSTELLATION ENERGY GROUP INCCEG

ALLEN PAUL J

Senior Vice President

Transactions

Disposition to Issuer
Common Stock
2012-03-12−1,887.139→ 0 total(indirect: By 401 (k))
Disposition to Issuer
Stock options (right to buy)
2012-03-12−23,290→ 0 total
Exercise: $28.81Exp: 2013-05-02→ Common Stock (23,290 underlying)
Disposition to Issuer
Stock options (right to buy)
2012-03-12−18,680→ 0 total
Exercise: $50.96Exp: 2015-02-24→ Common Stock (18,860 underlying)
Disposition to Issuer
Stock options (right to buy)
2012-03-12−12,090→ 0 total
Exercise: $75.85Exp: 2017-02-22→ Common Stock (12,090 underlying)
Disposition to Issuer
Stock options (right to buy)
2012-03-12−9,330→ 0 total
Exercise: $93.97Exp: 2018-02-21→ Common Stock (9,330 underlying)
Disposition to Issuer
Stock options (right to buy)
2012-03-12−36,060→ 0 total
Exercise: $19.76Exp: 2019-02-27→ Common Stock (36,060 underlying)
Disposition to Issuer
Stock options (right to buy)
2012-03-12−21,710→ 0 total
Exercise: $35.07Exp: 2020-02-26→ Common Stock (21,710 underlying)
Disposition to Issuer
Stock options (right to buy)
2012-03-12−31,790→ 0 total
Exercise: $30.18Exp: 2021-02-25→ Common Stock (31,790 underlying)
Disposition to Issuer
Stock options (right to buy)
2012-03-12−39,530→ 0 total
Exercise: $36.49Exp: 2022-02-24→ Common Stock (39,530 underlying)
Disposition to Issuer
Common Stock
2012-03-12−11,741.728→ 0 total
Disposition to Issuer
Stock options (right to buy)
2012-03-12−18,190→ 0 total
Exercise: $39.63Exp: 2014-02-26→ Common Stock (18,190 underlying)

Footnotes (11)

[F1]Disposition of common stock pursuant to Agreement and Plan of Merger (the "Merger") between Exelon Corporation ("Exelon"), Bolt Acquisition Corporation, and Constellation Energy Group, Inc. ("Constellation"), whereby each share of Constellation common stock, without par value, converted into the right to receive 0.9300 shares of Exelon common stock, without par value, having a closing market value of $39.81 per share on the effective date of the Merger and a cash payment being made for any fractional shares.
[F10]Pursuant to the Merger, each Constellation stock option vested and converted into an option to purchase 0.9300 shares of Exelon common stock, without par value, at an exercise price of $32.46 per share.
[F11]Pursuant to the Merger, each Constellation stock option converted into an option to purchase 0.9300 shares of Exelon common stock, without par value, at an exercise price of $39.24 per share. These stock options were granted on 2/24/12 and will vest on 2/24/13, 2/24/14, and 2/24/15.
[F2]These are employee stock options.
[F3]Pursuant to the Merger, each Constellation stock option vested and converted into an option to purchase 0.9300 shares of Exelon common stock, without par value, at an exercise price of $30.98 per share.
[F4]Pursuant to the Merger, each Constellation stock option vested and converted into an option to purchase 0.9300 shares of Exelon common stock, without par value, at an exercise price of $42.62 per share.
[F5]Pursuant to the Merger, each Constellation stock option vested and converted into an option to purchase 0.9300 shares of Exelon common stock, without par value, at an exercise price of $54.80 per share.
[F6]Pursuant to the Merger, each Constellation stock option vested and converted into an option to purchase 0.9300 shares of Exelon common stock, without par value, at an exercise price of $81.56 per share.
[F7]Pursuant to the Merger, each Constellation stock option vested and converted into an option to purchase 0.9300 shares of Exelon common stock, without par value, at an exercise price of $101.05 per share.
[F8]Pursuant to the Merger, each Constellation stock option vested and converted into an option to purchase 0.9300 shares of Exelon common stock, without par value, at an exercise price of $21.25 per share.
[F9]Pursuant to the Merger, each Constellation stock option vested and converted into an option to purchase 0.9300 shares of Exelon common stock, without par value, at an exercise price of $37.71 per share.

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