Document:

exv4w1

Exhibit 4.1

CERTIFICATE OF DESIGNATIONS

OF

SERIES A CUMULATIVE REDEEMABLE PREFERRED STOCK

OF

POSTROCK ENERGY CORPORATION

     POSTROCK ENERGY CORPORATION, a corporation organized and existing under the General
Corporation Law of the State of Delaware (the “Corporation”), in accordance with the
provisions of Sections 103 and 151 thereof, DOES HEREBY CERTIFY:

     The board of directors of the Corporation (the “Board of Directors”), in accordance
with the provisions of the certificate of incorporation and the Bylaws of the Corporation and
applicable law, at a meeting duly called and held on September 1, 2010, adopted the following
resolution creating a series of 6,000 shares of Preferred Stock of the Corporation designated as
“Series A Cumulative Redeemable Preferred Stock”:

     RESOLVED, that pursuant to the authority vested in the Board of Directors and in accordance
with the provisions of the certificate of incorporation of the Corporation and applicable law, a
series of Preferred Stock, par value $0.01 per share, of the Corporation be and hereby is created,
and that the designation and number of shares of such series, and the voting and other powers,
preferences and relative, participating, optional or other rights, and the qualifications,
limitations and restrictions thereof (in addition to those set forth in the certificate of
incorporation of the Corporation that are applicable to Preferred Stock of all series), of the
shares of such series, are as follows:

     Section 1. Designation. The distinctive serial designation of such series of Preferred Stock
is “Series A Cumulative Redeemable Preferred Stock” (“Series A”). Each share of
Series A shall be identical in all respects to every other share of Series A.

     Section 2. Number of Shares. The authorized number of shares of Series A shall be 6,000.
Shares of Series A that are redeemed, purchased or otherwise acquired by the Corporation, or
converted into another series of Preferred Stock, shall be cancelled and retired and revert to
authorized but unissued shares of Preferred Stock (provided that any such cancelled shares of
Series A may be reissued only as shares of any series other than Series A).

     Section 3. Definitions. As used herein with respect to Series A:

     (a) “Additional Directors” has the meaning set forth in Section 10.

     (b) “Borrowing Base Facility” means the Second Amended and Restated Credit Agreement,
dated                     , 2010, among PostRock Energy Services Corporation, PostRock Midcontinent Production,
LLC, Royal Bank of Canada (as Administrative Agent and Collateral Agent) and the lenders party
thereto.

 

     (c) “Bylaws” means the bylaws of the Corporation, as they may be amended from time to
time.

     (d) “Business Day” means a day that is a Monday, Tuesday, Wednesday, Thursday or
Friday and is not a day on which banking institutions in Oklahoma City, Oklahoma or New York, New
York generally are authorized or obligated by law, regulation or executive order to close.

     (e) “Certificate of Designations” means this Certificate of Designations relating to
the Series A, as it may be amended from time to time.

     (f) “Certification of Incorporation” means the certificate of incorporation of the
Corporation, as it may be amended from time to time, and shall include this Certificate of
Designations.

     (g) “Change of Control” means the occurrence of any of the following events:

          (i) the sale, lease or transfer, in one transaction or a series of related transactions, of
all or substantially all of the Corporation’s assets (determined on a consolidated basis) to any
“person” or “group” (as such terms are used in Section 13(d)(3) of the Exchange Act) other than a
Wholly Owned Subsidiary; provided, however, that a transaction covered by this clause (i) shall not
be a Change of Control if a Specified Person is a party in the transaction; or

          (ii) the consolidation or merger of the Corporation with or into any other Person or the
merger of another Person with or into the Corporation, pursuant to which the holders of 100% of the
total voting power of the total outstanding capital stock of the Corporation immediately prior to
the consummation of such consolidation or merger do not beneficially own (within the meaning of
Rule 13d-3 of the Exchange Act) in the aggregate more than 50% of the total voting power of the
total outstanding capital stock of the continuing or surviving Person immediately after such
transaction; provided, however, that a transaction covered by this clause (ii) shall not be a
Change of Control if the parties to such transaction include a Specified Person; or

          (iii) the acquisition, directly or indirectly, by any “person” or “group” (as such terms are
used in Section 13(d)(3) of the Exchange Act), other than White Deer Energy, L.P. or its
affiliates, of beneficial ownership (as defined in Rule 13d-3 under the Exchange Act) of more than
20% of the total voting power of the total outstanding capital stock of the Corporation; provided,
however, that a transaction covered by this clause (iii) shall not be a Change of Control if the
party from whom such stock is acquired in such acquisition is a Specified Person or if a Specified
Person has in the aggregate beneficial ownership, immediately prior to such acquisition, of a
percentage of the total outstanding capital stock of the Corporation greater than 25%; or

          (iv) the first day on which a majority of the individuals who constitute the entire Board of
Directors (excluding any Additional Directors) shall not be Continuing Directors.

     (h) “Change of Control Payment Date” has the meaning set forth in Section 7(b)(ii).

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     (i) “Change of Control Price” has the meaning set forth in Section 7(f).

     (j) “Common Stock” means the common stock, par value $0.01 per share, of the
Corporation.

     (k) “Continuing Directors” means individuals (i) who are directors of the Corporation
on the Original Issue Date (“Incumbent Directors”), (ii) whose nomination for election or
election to the Board of Directors was approved by a majority of the Incumbent Directors then still
in office, or (iii) whose nomination for election or election to the Board of Directors was
approved by a majority of the Incumbent Directors and the directors approved pursuant to clause
(ii) then still in office.

     (l) “Default” means (i) after July 1, 2013, the Corporation’s failure to pay in cash
any dividend on the applicable Dividend Payment Date in accordance with Section 4 of this
Certificate of Designations or (ii) any action or failure to act by the Corporation in violation of
Section 6(a), Section 7 or Section 9.

     (m) “Dividend Payment Date” means each September 30, December 31, March 31 and June
30, commencing on December 31, 2010.

     (n) “Dividend Period” has the meaning set forth in Section 4(a).

     (o) “Dividend Record Date” has the meaning set forth in Section 4(a).

     (p) “Exchange Act” means the Securities Exchange Act of 1934, as amended, and the
rules and regulations promulgated thereunder.

     (q) “Junior Stock” means the Common Stock, Series B and any other class or series of
stock of the Corporation (other than Series A) that ranks junior to Series A either or both as to
the payment of dividends and/or as to the distribution of assets on any liquidation, dissolution or
winding up of the Corporation.

     (r) “Liquidation Preference” means, with respect to each share of Series A, on any
date of determination, the sum of (i) $10,000 and (ii) the accrued and unpaid dividends thereon
(including, if applicable as provided in Section 4(a), dividends on such amount), whether or not
declared, to such date.

     (s) “Original Issue Date” means September __, 2010.

     (t) “Person” means any individual, corporation, limited liability company,
partnership, joint venture, association, joint stock company, trust, unincorporated organization,
or government or any agency or political subdivision thereof.

     (u) “Preferred Stock” means any and all series of preferred stock, par value $0.01 per
share, of the Corporation, including the Series A and Series B.

     (v) Purchase Agreement” means the Securities Purchase Agreement, dated as of September
2, 2010, as amended from time to time, between the Corporation, White Deer Energy

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L.P., White Deer Energy TE L.P. and White Deer Energy FI L.P., including all schedules and
exhibits thereto.

     (w) “QER Loan” means the Third Amended and Restated Credit Agreement, dated _______,
2010, among Quest Eastern Resource, LLC, Royal Bank of Canada (as Administrative Agent and
Collateral Agent) and Royal Bank of Canada, as Lender.

     (x) “Secured Pipeline Loan” means the Second Amended and Restated Credit Agreement,
dated _______, 2010, among PostRock KPC Pipeline, LLC, PostRock Energy Services Corporation, Royal
Bank of Canada (as Administrative and Collateral Agent) and the lenders party thereto.

     (y) “Series B” means the Corporation’s Preferred Stock designated as “Series B Voting
Preferred Stock.”

     (z) “Series B Certificate” means the Certificate of Designations of Series B Voting
Preferred Stock relating to the Series B, as it may be amended from time to time.

     (aa) “Specified Person” means White Deer Energy L.P. or any of its affiliates.

     (bb) “Warrants” means the Warrants to purchase shares of Common Stock, issued pursuant
to the Purchase Agreement, including Section 1.4 thereof.

     (cc) “Wholly Owned Subsidiary” means any subsidiary of the Corporation to the extent
that all of the securities of any class or classes of capital stock of such subsidiary entitling
the holders thereof (whether at all times or at the times that such class of capital stock has
voting power by reason of the happening of any contingency) to vote in the election of members of
the board of directors or comparable body of such subsidiary are owned directly or indirectly by
the Corporation.

Section 4. Dividends.

     (a) Rate. Holders of Series A shall be entitled to receive, on each share of Series A, out of
funds legally available for the payment of dividends under Delaware law, cumulative cash dividends
at a per annum rate of 12% on the Liquidation Preference. Such dividends shall begin to accrue and
be cumulative from the Original Issue Date, shall compound on each Dividend Payment Date (i.e., no
dividends shall accrue on other dividends unless and until the first Dividend Payment Date for such
other dividends has passed without such other dividends having been paid on such date), and shall
be payable in arrears (as provided in this Section 4(a)). Prior to July 1, 2013, dividends shall
be payable only when, as and if declared by the Board of Directors. Thereafter, the Board of
Directors shall declare dividends, payable on each Dividend Payment Date, subject only to the legal
availability of funds for declaration and payment thereof. If any such Dividend Payment Date would
otherwise occur on a day that is not a Business Day, such Dividend Payment Date shall instead be
(and any dividend payable on Series A on such Dividend Payment Date shall instead be payable on)
the immediately succeeding Business Day with the same force and effect as if made on such Dividend
Payment Date. The amount of dividends payable on the Series A shall be computed on the basis of a
360-day year consisting of

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twelve 30-day months, and with respect to any date of determination that is not a Dividend
Payment Date, actual days elapsed over a 30-day month.

     Dividends that are payable on Series A on any Dividend Payment Date shall be payable to
holders of record of Series A as they appear on the stock register of the Corporation on the
applicable record date, which shall be the 15th calendar day before such Dividend Payment Date (as
originally scheduled) or such other record date fixed by the Board of Directors that is not more
than 60 nor less than 10 days prior to such Dividend Payment Date (each, a “Dividend Record
Date”). Any such day that is a Dividend Record Date shall be a Dividend Record Date whether or
not such day is a Business Day.

     Each dividend period (a “Dividend Period”) shall commence on the calendar day
immediately following a Dividend Payment Date (other than the initial Dividend Period, which shall
commence on and include the Original Issue Date of the Series A) and shall end on and include the
next Dividend Payment Date. Dividends payable in respect of a Dividend Period shall be payable in
arrears on the Dividend Payment Date ending such Dividend Period.

     (b) Priority of Dividends. When dividends are not paid (or declared and a sum sufficient for
payment thereof set aside for the benefit of the holders thereof on the applicable Dividend Record
Date) on any Dividend Payment Date in full upon the Series A, all dividends declared on the Series
A and payable on such Dividend Payment Date shall be declared pro rata so that the respective
amounts of such dividends declared shall bear the same ratio to each other as all accrued and
unpaid dividends per share on the Series A (including, if applicable as provided in Section 4(a)
above, dividends on such amount) bear to each other.

Section 5. Liquidation Rights.

     (a) Voluntary or Involuntary Liquidation. In the event of any liquidation, dissolution or
winding up of the affairs of the Corporation, whether voluntary or involuntary, holders of Series A
shall be entitled to receive for each share of Series A, out of the assets of the Corporation or
proceeds thereof (whether capital or surplus) available for distribution to stockholders of the
Corporation, and after satisfaction of all liabilities and obligations to creditors of the
Corporation, before any distribution of such assets or proceeds is made to or set aside for the
holders of Common Stock and any other Junior Stock, payment in full in an amount equal to the
Liquidation Preference of such share.

     (b) Partial Payment. If in any distribution described in Section 5(a) above, the assets of
the Corporation or proceeds thereof are not sufficient to pay the Liquidation Preferences in full
to all holders of Series A as to such distribution, the amounts paid to the holders of Series A
shall be paid pro rata in accordance with the respective aggregate Liquidation Preferences of the
holders of Series A.

     (c) Residual Distributions. If the Liquidation Preference has been paid in full to all
holders of Series A, the holders of other stock of the Corporation shall be entitled to receive all
remaining assets of the Corporation (or proceeds thereof) according to their respective rights and
preferences.

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     (d) Merger, Consolidation and Sale of Assets Not Liquidation. For purposes of this Section 5,
the merger or consolidation of the Corporation with any other corporation or other entity,
including a merger or consolidation in which the holders of Series A receive cash, securities or
other property for their shares, or the sale, lease or exchange (for cash, securities or other
property) of all or substantially all of the assets of the Corporation, shall not constitute a
liquidation, dissolution or winding up of the Corporation, but shall be governed by Section 7.

Section 6. Redemption.

     (a) Mandatory Redemption. On March                     , 2018, the Corporation shall redeem, in whole, the
shares of Series A at the time outstanding, upon notice given as provided in Section 6(c) below, at
a redemption price per share equal to 100% of the Liquidation Preference of such share as of the
redemption date. The redemption price for any shares of Series A shall be payable on the
redemption date to the holder of such shares against surrender of the certificate(s) evidencing
such shares to the Corporation or its agent.

     (b) Optional Redemption. From and after one year from the Original Issue Date until March __,
2018, the Corporation, at its option, may redeem, in whole at any time or in part from time to
time, the shares of Series A at the time outstanding, upon notice given as provided in Section 6(c)
below, at a redemption price per share equal to 110% of the Liquidation Preference of such share as
of the redemption date, provided that the minimum number of shares of Series A redeemable at any
time is the lesser of (i) 500 shares of Series A and (ii) the number of shares of Series A
outstanding. The redemption price for any shares of Series A shall be payable on the redemption
date to the holder of such shares against surrender of the certificate(s) evidencing such shares to
the Corporation or its agent.

     (c) Notice of Redemption. Notice of every redemption of shares of Series A shall be given to
the holders of record of the shares to be redeemed at their respective last addresses appearing on
the books of the Corporation. Such mailing shall be at least 30 days and not more than 60 days
before the date fixed for redemption. Any notice mailed as provided in this Subsection shall be
conclusively presumed to have been duly given, whether or not the holder receives such notice, but
failure duly to give such notice by mail, or any defect in such notice or in the mailing thereof,
to any holder of shares of Series A designated for redemption shall not affect the validity of the
proceedings for the redemption of any other shares of Series A. Each notice of redemption given to
a holder shall state: (1) the redemption date; (2) the number of shares of Series A to be redeemed
and, if less than all the shares held by such holder are to be redeemed, the number of such shares
to be redeemed from such holder; (3) the redemption price; and (4) the place or places where
certificates for such shares are to be surrendered for payment of the redemption price.

     (d) Partial Redemption. In case of any redemption of part of the shares of Series A at the
time outstanding, the shares to be redeemed shall be selected pro rata among holders of the Series
A. If fewer than all the shares represented by any certificate are redeemed, a new certificate
shall be issued representing the unredeemed shares without charge to the holder thereof.

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     (e) Effectiveness of Redemption. If notice of redemption has been duly given and if on or
before the redemption date specified in the notice all funds necessary for the redemption have been
deposited by the Corporation, in trust for the pro rata benefit of the holders of the shares called
for redemption, with a bank or trust company doing business in the Borough of Manhattan, The City
of New York, and having a capital and surplus of at least $500 million and selected by the Board of
Directors, so as to be and continue to be available solely therefor, then, notwithstanding that any
certificate for any share so called for redemption has not been surrendered for cancellation, on
and after the redemption date dividends shall cease to accrue on all shares so called for
redemption, all shares so called for redemption shall no longer be deemed outstanding and all
rights with respect to such shares shall forthwith on such redemption date cease and terminate,
except only the right of the holders thereof to receive the amount payable on such redemption from
such bank or trust company, without interest. Any funds unclaimed at the end of three years from
the redemption date shall, to the extent permitted by law, be released to the Corporation, after
which time the holders of the shares so called for redemption shall look only to the Corporation
for payment of the redemption price of such shares.

Section 7. Offer to Purchase Upon a Change of Control.

     (a) In connection with the occurrence of a Change of Control, the Corporation shall make an
offer to purchase all of the shares of Series A outstanding (a “Change of Control Offer”)
on the terms set forth in this Section 7. The Change of Control Offer shall be made in compliance
with all applicable laws, including, without limitation (if applicable), Regulation 14E and 14D
under the Exchange Act and the rules thereunder and all other applicable Federal and state
securities laws. To the extent that the provisions of any securities laws or regulations conflict
with the provisions of this Section 7, the Corporation shall comply with the applicable securities
laws and regulations and shall not be deemed to have breached its obligations under this Section 7
by virtue thereof.

     (b) No sooner than fifteen (15) days and within that time period, as soon as reasonably
practicable, prior to the consummation, or anticipated consummation, of a Change of Control, the
Corporation shall commence the Change of Control Offer by mailing to each holder of shares of
Series A a notice, which shall govern the terms of the Change of Control Offer, and shall state:

          (i) that the Change of Control Offer is being made pursuant to this Section 7 and that all
shares of Series A tendered will be accepted for payment subject to the consummation of the Change
of Control;

          (ii) the Change of Control Price (as defined below) and the date until which the Corporation
may accept for payment shares of Series A (the “Change of Control Payment Date”), which
shall be (subject to consummation of the Change of Control) no later than forty-five (45) days
after the date the Change of Control occurs;

          (iii) that any shares of Series A not tendered for payment pursuant to the Change of Control
Offer shall continue to accrue dividends and be redeemable in accordance with the terms hereof;

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          (iv) that, unless the Corporation defaults in the payment of the Change of Control Price, all
shares of Series A accepted for payment pursuant to the Change of Control Offer shall cease to
accrue dividends on the Change of Control Payment Date;

          (v) that any holder electing to have certificates representing shares of Series A pursuant to
a Change of Control Offer shall be required to surrender such certificates representing shares of
Series A to the Corporation or its designated agent at the address specified in the notice prior to
the close of business on the Change of Control Payment Date;

          (vi) that any holder of a share of Series A shall be entitled to withdraw such election if the
Corporation or its designated agent receives, not later than the close of business on the Change of
Control Payment Date, a telegram, telex, facsimile transmission or letter setting forth the name of
the holder of such shares of Series A, the number of shares of Series A such holder delivered for
purchase, and a statement that such holder is withdrawing its election to have such shares of
Series A purchased;

          (vii) that a holder whose shares of Series A are being purchased only in part shall be issued
new shares of Series A for the unpurchased shares of Series A represented by any certificate
surrendered;

          (viii) the instructions that holders must follow in order to tender their shares of Series A;
and

          (ix) the circumstances and relevant facts regarding such Change of Control.

     (c) On the Change of Control Payment Date, the Corporation shall, to the extent of funds
legally available therefore and otherwise lawful, accept for payment the shares of Series A
tendered and not withdrawn pursuant to the Change of Control Offer. The Corporation shall promptly
mail to each holder of shares of Series A so accepted payment (or pay in person any holder
presenting itself at the Corporation) in an amount equal to the purchase price for such shares, and
the unpurchased shares of Series A surrendered, if any.

     (d) The Corporation shall make a public announcement of the results of the Change of Control
Offer on or as soon as practicable after the Change of Control Payment Date.

     (e) The Corporation shall not enter into any agreement providing for a Change of Control
unless the agreement permits the Corporation or any successor entity to comply with the provisions
hereof.

     (f) “Change of Control Price” means an amount of cash per share of Series A equal to
110% of the Liquidation Price of such share as of the date of acceptance for payment.

Section 8. Conversion. Holders of Series A shares shall have no right to exchange or convert
such shares into any other securities.

Section 9. Voting Rights.

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     (a) General. The holders of Series A shall not have any voting rights except as set forth
below or as otherwise from time to time required by law.

     (b) Voting Rights as to Particular Matters.

          (i) So long as any shares of Series A are outstanding, in addition to any other vote or
consent of stockholders required by law or by the Certificate of Incorporation, the vote or consent
of the holders of a majority of the shares of Series A at the time outstanding and entitled to vote
thereon, given in person or by proxy, either in writing without a meeting or by vote at any meeting
called for the purpose, shall be necessary for effecting or validating:

               (A) Any amendment, alteration or repeal of any provision of the Certificate of Incorporation
so as to change the rights, preferences, privileges or voting powers of the Series A;

               (B) Any amendment or alteration of the Certificate of Incorporation to authorize or create, or
increase or decrease the authorized amount of, any shares of Series A, or the issuance of any
shares of Series A;

               (C) Any amendment or alteration of the Certificate of Incorporation to authorize or create, or
increase the authorized amount of, any shares of any class or series of capital stock of the
Corporation ranking pari passu with or senior to the Series A with respect to either or both the
payment of dividends or the distribution of assets on any liquidation, dissolution or winding up of
the Corporation;

               (D) Any amendment, alteration or repeal of any provision of the Certificate of Incorporation
or Bylaws so as to adversely affect the special rights, preferences, privileges or voting powers of
the Series A;

               (E) Any declaration or payment of cash dividends on any Common Stock or other Junior Stock;

               (F) Any redemption or repurchase of any shares of any class or series of capital stock of the
Corporation, other than the Series A and any shares of Common Stock withheld by the Corporation to
pay taxes upon the granting or vesting of awards to any of its employees under any equity
compensation plan of the Corporation;

               (G) Any increase in the size of the Board of Directors, except as set forth in Section 10(i);

               (H) Any renewal, extension or refinancing of the Secured Pipeline Loan or QER Loan, or
increase of the borrowing base under the Borrowing Base Facility; or

               (I) Any material change in the Corporation’s business as conducted on the Original Issue Date;

provided, however, that the transactions contemplated in the Series B Certificate and the Warrant
shall be permitted without any vote or consent of the holders of shares of Series A.

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     (c) Procedures for Voting and Consents. The rules and procedures for calling and conducting
any meeting of the holders of Series A (including, without limitation, the fixing of a record date
in connection therewith), the solicitation and use of proxies at such a meeting, the obtaining of
written consents and any other aspect or matter with regard to such a meeting or such consents
shall be governed by any rules of the Board of Directors, in its discretion, may adopt from time to
time, which rules and procedures shall conform to the requirements of the Certificate of
Incorporation, the Bylaws, and applicable law and the rules of any national securities exchange or
other trading facility on which the Series A is listed or traded at the time. Whether the vote or
consent of the holders of a plurality, majority or other portion of the shares of Series A has been
cast or given on any matter on which the holders of shares of Series A are entitled to vote shall
be determined by the Corporation by reference to the Liquidation Preference of the shares voted or
covered by the consent.

     Section 10. Default. Upon the occurrence of a Default, if such Default shall not have been
cured within thirty (30) days after the date on which the holders of a majority of the Series A
give written notice of such Default to the Corporation:

               (i) the holders of a majority of the Series A shall have the right to elect two additional
directors to the Board of Directors (the “Additional Directors”) to serve until the date on which
such Default is cured or waived by the holders of Series A; provided that the number of any
Additional Directors shall not exceed two at any time regardless of the occurrence of one or more
Defaults; and

               (ii) the dividend rate shall increase by 2.00% from and including the date on which the
Default occurred and be continuing through but excluding the date on which the Default is cured or
waived by the holders of Series A; provided that any increase in the dividend rate shall not exceed
2.00% at any time, regardless of the number of Defaults.

     Section 11. Record Holders. To the fullest extent permitted by applicable law, the
Corporation may deem and treat the record holder of any share of Series A as the true and lawful
owner thereof for all purposes, and the Corporation shall not be affected by any notice to the
contrary.

     Section 12. Notices. All notices or communications in respect of Series A shall be
sufficiently given if given in writing and delivered in person or by fax, overnight or certified
mail, or if given in such other manner as may be permitted in this Certificate of Designations, in
the Certificate of Incorporation or Bylaws or by applicable law.

     Section 13. No Preemptive Rights. No share of Series A shall have any rights of preemption
whatsoever as to any securities of the Corporation, or any warrants, rights or options issued or
granted with respect thereto, regardless of how such securities, or such warrants, rights or
options, may be designated, issued or granted.

     Section 14. Replacement Certificates. The Corporation shall replace any mutilated certificate
at the holder’s expense upon surrender of that certificate to the Corporation. The Corporation
shall replace certificates that become destroyed, stolen or lost at the holder’s expense upon
delivery to the Corporation of reasonably satisfactory evidence that the certificate

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has been destroyed, stolen or lost, together with any indemnity that may be reasonably
required by the Corporation.

     Section 15. Other Rights. The shares of Series A shall not have any rights, preferences,
privileges or voting powers or relative, participating, optional or other special rights, or
qualifications, limitations or restrictions thereof, other than as set forth herein or in the
Certificate of Incorporation or as provided by applicable law.

[Signature Page Follows.]

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     In Witness Whereof, POSTROCK ENERGY CORPORATION has caused this certificate to be signed this
                     day of                     , 2010.

	 	 	 	 	 
	 	POSTROCK ENERGY CORPORATION

 	 
	 	By:  	
 	 
	 	 	Name:  	 	 
	 	 	Title:exv4w2

Exhibit 4.2

CERTIFICATE OF DESIGNATIONS

OF

SERIES B VOTING PREFERRED STOCK

OF

POSTROCK ENERGY CORPORATION

     POSTROCK ENERGY CORPORATION, a corporation organized and existing under the General
Corporation Law of the State of Delaware (the “Corporation”), in accordance with the
provisions of Sections 103 and 151 thereof, DOES HEREBY CERTIFY:

     The board of directors of the Corporation (the “Board of Directors”), in accordance
with the provisions of the certificate of incorporation and the Bylaws of the Corporation and
applicable law, at a meeting duly called and held on September 1, 2010, adopted the following
resolution creating a series of 500,000 shares of Preferred Stock of the Corporation designated as
“Series B Voting Preferred Stock”:

     RESOLVED, that pursuant to the authority vested in the Board of Directors and in accordance
with the provisions of the certificate of incorporation of the Corporation and applicable law, a
series of Preferred Stock, par value $0.01 per share, of the Corporation be and hereby is created,
and that the designation and number of shares of such series, and the voting and other powers,
preferences and relative, participating, optional or other rights, and the qualifications,
limitations and restrictions thereof (in addition to those set forth in the certificate of
incorporation of the Corporation that are applicable to Preferred Stock of all series), of the
shares of such series, are as follows:

     Section 1. Designation. The distinctive serial designation of such series of Preferred Stock is “Series B Voting Preferred Stock” (“Series B”). Each share of Series B shall be
identical in all respects to every other share of Series B.

     Section 2. Number of Shares. The authorized number of shares of Series B shall be 500,000.
Shares of Series B that are purchased or otherwise acquired by the Corporation may thereafter be
reissued or otherwise disposed of by the Corporation in accordance herewith or may be retired and
cancelled by the Corporation.

     Section 3. Definitions. As used herein with respect to Series B:

          (a) “Bylaws” means the bylaws of the Corporation, as they may be amended from time to
time.

          (b) “Certificate of Designations” means this Certificate of Designations relating to
the Series B, as it may be amended from time to time.

 

          (c) “Certification of Incorporation” means the certificate of incorporation of the
Corporation, as it may be amended from time to time, and shall include this Certificate of
Designations.

          (d) “Common Stock” means the common stock, par value $0.01 per share, of the
Corporation.

          (e) “Fractional Share” means one one-hundredth of a share of Series B.

          (f) “Preferred Stock” means any and all series of preferred stock, par value $0.01 per
share, of the Corporation, including the Series B.

          (g) “Purchase Agreement” means the Securities Purchase Agreement, dated as of
September 2, 2010, as amended from time to time, between the Corporation, White Deer Energy L.P.,
White Deer Energy TE L.P. and White Deer Energy FI L.P., including all schedules and exhibits
thereto.

          (h) “Redeemable Date” means, with respect to any share of Series B, the day
immediately following the Expiration Time (as defined in the Warrants) of the Warrant that is part
of the unit with such share of Series B.

          (i) “Series A” means the Preferred Stock designated as “Series A Cumulative Redeemable
Preferred Stock.”

          (j) “Warrants” means the Warrants to purchase shares of Common Stock, issued pursuant
to the Purchase Agreement, including Section 1.4 thereof.

          (k) “Voting Stock” means Series B and Common Stock.

     Section 4. Dividends. No dividends shall be paid to the holders of Series B.

     Section 5. Liquidation Rights. In the event of any liquidation, dissolution or winding up of
the affairs of the Corporation, whether voluntary or involuntary, holders of Series B shall be
entitled to receive for each share of Series B, out of the assets of the Corporation or proceeds
thereof (whether capital or surplus) available for distribution to stockholders of the Corporation,
and after satisfaction of all liabilities and obligations to creditors of the Corporation and any
distributions of such assets or proceeds made to or set aside for the holders of Series A, before
any distribution of such assets or proceeds is made to or set aside for the holders of Common Stock
and any other stock of the Corporation ranking junior to the Series B as to such distribution,
payment in full in an amount equal to $0.01 per share. For purposes of this Section 5, the merger
or consolidation of the Corporation with any other corporation or other entity, including a merger
or consolidation in which the holders of Series B receive cash, securities or other property for
their shares, or the sale, lease or exchange (for cash, securities or other property) of all or
substantially all of the assets of the Corporation, shall not constitute a liquidation, dissolution
or winding up of the Corporation.

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     Section 6. Conversion, Redemption and Other Rights.

          (a) The Series B is not convertible into any other class or series of the capital stock of the
Corporation or into cash, property or other rights, and no share of Series B may be redeemed prior
to its applicable Redeemable Date.

          (b) On and from time to time after each Redeemable Date, the Corporation may, at its option,
redeem, in whole or in part, the then-outstanding shares of Series B issued on a date on or prior
to the date that is ninety (90) months before such Redeemable Date, at a redemption price per share
equal to $0.01. The redemption price for any such shares of Series B shall be payable on the
applicable redemption date selected by the Corporation to the holder of such shares against
surrender of the certificate(s) evidencing such shares to the Corporation or its agent. The
Corporation may elect to pay the redemption price in cash or whole shares of Common Stock of the
Corporation with a value equal to the Market Price (as defined in the Warrant) on the trading day
immediately preceding the redemption date

          (c) If on or before each redemption date all funds or shares of Common Stock necessary for the
redemption have been deposited by the Corporation, in trust for the pro rata benefit of the holders
of the shares called for redemption, with a bank or trust company doing business in the Borough of
Manhattan, The City of New York, so as to be and continue to be available solely therefor, then,
notwithstanding that any certificate for any share so called for redemption has not been
surrendered for cancellation, on and after the applicable redemption date all shares so called for
redemption shall no longer be deemed outstanding and all rights with respect to such shares shall
forthwith on the applicable redemption date cease and terminate, except only the right of the
holders thereof to receive the redemption price payable on such redemption from such bank or trust
company, without interest. Any funds or shares of Common Stock unclaimed at the end of ninety days
from the applicable redemption date shall, to the extent permitted by law, be released to the
Corporation, after which time the holders of the shares so called for redemption shall look only to
the Corporation for payment of the redemption price of such shares.

     Section 7. Transfer; Surrender Upon Exercise of Warrants. Each Fractional Share of Series B
shall be issued as a unit with a Warrant, or portion thereof, representing the right to purchase
one share of Common Stock and may only be sold or otherwise transferred concurrently with the sale
of such Warrant. Any sale or transfer, or purported sale or transfer, of shares or Fractional
Shares of Series B shall be null and void, and the Corporation shall have no obligation to effect
any transfer, unless the foregoing transfer restrictions are strictly observed. In the event that
a holder of Series B exercises its right to acquire Common Stock of the Corporation pursuant to a
Warrant, such holder shall surrender to the Corporation a number of Fractional Shares of Series B
of such holder equal to the number of shares of Common Stock purchased upon exercise of such
Warrant. In no event shall the Corporation issue any shares of Series B, or Fractional Shares,
other than in connection with the issuance of Warrants pursuant to and in accordance with the
Purchase Agreement and otherwise in connection with such Warrants.

     Section 8. Voting Rights.

          (a) Each full share of Series B shall be entitled to 100 votes, with each Fractional Share

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being entitled to one vote. So long as any shares of Series B are outstanding, in addition to
any other vote or consent of stockholders required by law or by the Certificate of Incorporation,
the holders of Series B shall be entitled to vote in the election of directors and on all other
matters submitted to a vote of the holders of Common Stock of the Corporation, with the Series B
and Common Stock voting together as a single class; provided, however, that (i) until December 31,
2011, the holders of Series B and their affiliates shall not be entitled, with respect to all
shares, including Fractional Shares, of Series B and other Voting Stock owned by them, to more
votes than the number equal to the product of (A) 45 and (B) the quotient obtained by dividing (x)
the number of votes all other holders of Voting Stock are entitled to by (y) 55, and (ii) after
December 31, 2011, the holders of Series B and their affiliates shall not be entitled, solely with
respect to all shares, including Fractional Shares, of Series B owned by them, to more votes than
the number equal to the product of (A) 45 and (B) the quotient obtained by dividing (x) the number
of votes all other Voting Stock (including such Voting Stock owned by the holders of Series B and
their affiliates) is entitled to by (y) 55. If more than one person holds Series B, then the
voting rights of such persons shall be reduced pro rata according to their ownership percentages in
order to comply with this limitation. Any share, including any Fractional Share, of Series B and,
if applicable, other Voting Stock with respect to which the holders of Series B and their
affiliates are not entitled to vote pursuant to the limitations in this Section 8(a), shall not be
considered, in determining whether a quorum is present at any meeting of stockholders of the
Corporation, as outstanding shares of capital stock entitled to vote at such meeting.

     (b) So long as any shares of Series B are outstanding, in addition to any other vote or
consent of stockholders required by law or by the Certificate of Incorporation, the vote or consent
of the holders of a majority of the shares of Series B at the time outstanding and entitled to vote
thereon, given in person or by proxy, either in writing without a meeting or by vote at any meeting
called for the purpose, shall be necessary for effecting or validating:

               (i) Any amendment, alteration or repeal of any provision of the Certificate of Incorporation
so as to change the rights, preferences, privileges or voting powers of the Series B;

               (ii) Any amendment or alteration of the Certificate of Incorporation to authorize or create,
or increase or decrease the authorized amount of, any shares of Series B;

               (iii) Any amendment, alteration or repeal of any provision of the Certificate of Incorporation
or Bylaws so as to materially and adversely affect the special rights, preferences, privileges or
voting powers of the Series B.

Notwithstanding anything herein to the contrary, in no event shall any holder of full shares or
Fractional Shares of Series B be entitled to (i) vote on any matter on which the Series B is
entitled to vote unless such holder shall also be the record holder of the corresponding Warrant
that is part of the unit with such shares or Fractional Shares and (ii) cast a number of votes in
excess of the number of shares purchasable upon exercise of the Warrants of which such holder is
the record holder. Furthermore, except as provided by law, no share or Fractional Share of Series
B shall have any voting rights following the Redeemable Date for such share.

     Section 9. Record Holders. To the fullest extent permitted by applicable law, the Corporation
may deem and treat the record holder of any share of Series B as the true and lawful

4

 

owner thereof for all purposes, and the Corporation shall not be affected by any notice to the
contrary.

     Section 10. Notices. All notices or communications in respect of Series B shall be
sufficiently given if given in writing and delivered in person or by fax, overnight or certified
mail, or if given in such other manner as may be permitted in this Certificate of Designations, in
the Certificate of Incorporation or Bylaws or by applicable law.

     Section 11. No Preemptive Rights. No share of Series B shall have any rights of preemption
whatsoever as to any securities of the Corporation, or any warrants, rights or options issued or
granted with respect thereto, regardless of how such securities, or such warrants, rights or
options, may be designated, issued or granted.

     Section 12. Replacement Certificates. The Corporation shall replace any mutilated certificate
at the holder’s expense upon surrender of that certificate to the Corporation. The Corporation
shall replace certificates that become destroyed, stolen or lost at the holder’s expense upon
delivery to the Corporation of reasonably satisfactory evidence that the certificate has been
destroyed, stolen or lost, together with any indemnity that may be reasonably required by the
Corporation.

     Section 13. Other Rights. The shares of Series B shall not have any rights, preferences,
privileges or voting powers or relative, participating, optional or other special rights, or
qualifications, limitations or restrictions thereof, other than as set forth herein or in the
Certificate of Incorporation or as provided by applicable law.

[Signature Page Follows.]

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     In Witness Whereof, POSTROCK ENERGY CORPORATION has caused this certificate to be signed this
                     day of                     , 2010.

	 	 	 	 	 
	 	POSTROCK ENERGY CORPORATION

 	 
	 	By:  	 	 
	 	 	Name:  	 	 
	 	 	Title:

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