SEC Form 3
FORM 3 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person*
CONSTELLATION ENERGY GROUP INC

(Last) (First) (Middle)
100 CONSTELLATION WAY

(Street)
BALTIMORE MD 21202

(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
08/08/2011
3. Issuer Name and Ticker or Trading Symbol
PostRock Energy Corp [ PSTR ]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director X 10% Owner
Officer (give title below) Other (specify below)
5. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
Form filed by One Reporting Person
X Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock 1,000,000 I By Constellation Energy Commodities Group, Inc. (1)
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year) 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Common Stock Warrants (right to buy) 08/08/2011 08/08/2012 Common Stock 224,607 6.57 I By Constellation Energy Commodities Group, Inc. (1)
Common Stock Warrants (right to buy) 08/08/2011 08/08/2013 Common Stock 224,607 7.07 I By Constellation Energy Commodities Group, Inc. (1)
Common Stock Warrants (right to buy) 08/08/2011 08/08/2014 Common Stock 224,608 7.57 I By Constellation Energy Commodities Group, Inc. (1)
1. Name and Address of Reporting Person*
CONSTELLATION ENERGY GROUP INC

(Last) (First) (Middle)
100 CONSTELLATION WAY

(Street)
BALTIMORE MD 21202

(City) (State) (Zip)
1. Name and Address of Reporting Person*
Constellation Energy Commodities Group, Inc.

(Last) (First) (Middle)
100 CONSTELLATION WAY

(Street)
BALTIMORE MD 21202

(City) (State) (Zip)
Explanation of Responses:
1. Constellation Energy Group, Inc. indirectly wholly owns 100% of Constellation Energy Commodities Group, Inc.
/s/ Sean J. Klein, Assistant Secretary for Constellation Energy Group, Inc. 08/18/2011
/s/ Randall D. Osteen, Assistant Secretary for Constellation Energy Commodities Group, Inc. 08/18/2011
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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