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) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

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) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

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).
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