Document:

Exhibit 4.2

SPECIMEN CLASS A COMMON STOCK CERTIFICATE

	NUMBER	NUMBER
	 	C-
	 	SHARES
	 	SEE REVERSE FOR CERTAIN DEFINITIONS
	 	CUSIP ________________
	 	 

 

CENAQ Energy
Corp.

 

INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

CLASS A COMMON STOCK

 

This Certifies that      is the owner of

 

FULLY PAID AND NON-ASSESSABLE SHARES OF THE PAR VALUE OF $0.0001
EACH OF THE CLASS A COMMON STOCK OF

 

CENAQ Energy
Corp.

(THE “CORPORATION”)

 

transferable on the books of the Corporation in person or by
duly authorized attorney upon surrender of this certificate properly endorsed.

 

The Corporation will be forced to redeem
all of its shares of Class A common stock if it is unable to complete a business combination by    , 2023, all as more fully described
in the Corporation’s final prospectus dated      , 2021.

 

This certificate is not valid unless countersigned by the Transfer
Agent and registered by the Registrar.

 

Witness the seal of the Corporation and the facsimile signatures
of its duly authorized officers.

 

	
        

        Chief Executive Officer
	[Corporate Seal] Delaware
	 	 
	 	 

 

     

     

    

 

CENAQ Energy
Corp.

 

The Corporation will
furnish without charge to each stockholder who so requests the powers, designations, preferences and relative, participating, optional
or other special rights of each class of stock or series thereof of the Corporation and the qualifications, limitations, or restrictions
of such preferences and/or rights. This certificate and the shares represented thereby are issued and shall be held subject to
all the provisions of the Certificate of Incorporation and all amendments thereto and resolutions of the Board of Directors providing
for the issue of securities (copies of which may be obtained from the secretary of the Corporation), to all of which the holder
of this certificate by acceptance hereof assents. The following abbreviations, when used in the inscription on the face of this
certificate, shall be construed as though they were written out in full according to applicable laws or regulations:

 

	
        

        TEN COM
	-	as tenants in common	UNIF GIFT MIN ACT	-	 	Custodian	 
	TEN ENT	-	as tenants by the entireties	 	 	(Cust)	 	(Minor)

 

	JT TEN	-	as joint tenants with right of survivorship and not as tenants in common	 	 	
        under Uniform Gifts to Minors Act

        (State)

 

Additional abbreviations may also be used though not in the
above list.

 

For value received,              hereby sells, assigns and transfers
unto

 

(PLEASE INSERT
SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER(S) OF ASSIGNEE(S))

 

(PLEASE PRINT OR TYPEWRITE NAME(S) AND ADDRESS(ES), INCLUDING ZIP CODE, OF ASSIGNEE(S))

 

Shares of the capital stock
represented by the within Certificate, and hereby irrevocably constitutes and appoints Attorney to transfer the said stock on
the books of the within named Corporation with full power of substitution in the premises.

	
         

        Dated:
	 
	 

 

NOTICE: THE SIGNATURE(S) TO THIS ASSIGNMENT
MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT
OR ANY CHANGE WHATEVER.

	
         

        Signature(s) Guaranteed:
	 
	By	 
	 	 

 

THE SIGNATURE(S) MUST BE GUARANTEED BY
AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED
SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15 (OR ANY SUCCESSOR RULE).

 

In each case, as more fully described in
the Corporation’s final prospectus dated   , 2021, the holder(s) of this certificate shall be entitled to receive a pro-rata
portion of certain funds held in the trust account established in connection with its initial public offering only in the event
that (i) the Corporation redeems the shares of Class A common stock sold in the Company’s initial public offering and liquidates
because it does not consummate an initial business combination by   , 2023, (ii) the Corporation redeems the shares of Class
A common stock sold in its initial public offering in connection with a stockholder vote to amend the Corporation’s amended
and restated certificate of incorporation to modify the substance or timing of the Corporation’s obligation to redeem 100%
of the Class A common stock if it does not consummate an initial business combination by  , 2023, or (iii) if the holder(s)
seek(s) to redeem for cash his, her or its respective shares of Class A common stock in connection with a tender offer (or proxy
solicitation, solely in the event the Corporation seeks stockholder approval of the proposed initial business combination) setting
forth the details of a proposed initial business combination. In no other circumstances shall the holder(s) have any right or interest
of any kind in or to the trust account.Exhibit 4.3

SPECIMEN WARRANT CERTIFICATE

 

[FACE]

 

Number

 

Warrants

 

THIS WARRANT SHALL BE VOID IF NOT EXERCISED
PRIOR TO

THE EXPIRATION OF THE EXERCISE PERIOD PROVIDED FOR

IN THE WARRANT AGREEMENT DESCRIBED BELOW

 

CENAQ ENERGY CORP.

Incorporated Under the Laws of the State of Delaware

 

CUSIP __________________

 

Warrant
Certificate

 

This Warrant
Certificate certifies that , or registered assigns, is the registered holder of warrant(s) evidenced hereby (the
“Warrants” and each, a “Warrant”) to purchase shares of Class A common stock,
$0.0001 par value per share (“Common Stock”), of CENAQ Energy Corp., a Delaware corporation (the “Company”).
Each Warrant entitles the holder, upon exercise during the period set forth in the Warrant Agreement referred to below, to receive
from the Company that number of fully paid and non-assessable shares of Common Stock as set forth below, at the exercise price
(the “Exercise Price”) as determined pursuant to the Warrant Agreement, payable in lawful money (or through
“cashless exercise” as provided for in the Warrant Agreement) of the United States of America upon surrender
of this Warrant Certificate and payment of the Exercise Price at the office or agency of the Warrant Agent referred to below, subject
to the conditions set forth herein and in the Warrant Agreement. Defined terms used in this Warrant Certificate but not defined
herein shall have the meanings given to them in the Warrant Agreement.

 

Each Warrant is initially
exercisable for one fully paid and non-assessable share of Common Stock. The number of shares of Common Stock issuable upon exercise
of the Warrants is subject to adjustment upon the occurrence of certain events set forth in the Warrant Agreement.

 

The initial Exercise
Price per share of Common Stock for any Warrant is equal to $11.50 per share. The Exercise Price is subject to adjustment upon
the occurrence of certain events set forth in the Warrant Agreement.

 

Subject to the conditions
set forth in the Warrant Agreement, the Warrants may be exercised only during the Exercise Period and to the extent not exercised
by the end of such Exercise Period, such Warrants shall become void.

 

     

     

    

 

Reference is hereby
made to the further provisions of this Warrant Certificate set forth on the reverse hereof and such further provisions shall for
all purposes have the same effect as though fully set forth at this place.

 

This Warrant Certificate
shall not be valid unless countersigned by the Warrant Agent, as such term is used in the Warrant Agreement.

 

This Warrant Certificate
shall be governed by and construed in accordance with the internal laws of the State of New York, without regard to conflicts of
laws principles thereof.

 

	 	CENAQ ENERGY CORP.
	 	 
	 	By:	 
	 	Name:	 
	 	Title:	 
	 	 
	 	 
	 	
        CONTINENTAL STOCK TRANSFER

        & TRUST COMPANY as Warrant Agent

	 	 
	 	By:	                
	 	Name:	 
	 	Title:	 

 

    2

     

    

 

[Reverse]

 

The Warrants evidenced
by this Warrant Certificate are part of a duly authorized issue of Warrants entitling the holder on exercise to receive shares
of Common Stock and are issued or to be issued pursuant to a Warrant Agreement dated as of , 2021 (the “Warrant
Agreement”), duly executed and delivered by the Company to Continental Stock Transfer& Trust Company, a New York
corporation, as warrant agent (the “Warrant Agent”), which Warrant Agreement is hereby incorporated by
reference in and made a part of this instrument and is hereby referred to for a description of the rights, limitation of rights,
obligations, duties and immunities thereunder of the Warrant Agent, the Company and the holders (the words “holders”
or “holder” meaning the Registered Holders or Registered Holder) of the Warrants. A copy of the Warrant
Agreement may be obtained by the holder hereof upon written request to the Company. Defined terms used in this Warrant Certificate
but not defined herein shall have the meanings given to them in the Warrant Agreement.

 

Warrants may be exercised
at any time during the Exercise Period set forth in the Warrant Agreement. The holder of Warrants evidenced by this Warrant Certificate
may exercise them by surrendering this Warrant Certificate, with the form of election to purchase set forth hereon properly completed
and executed, together with payment of the Exercise Price as specified in the Warrant Agreement (or through “cashless exercise”
as provided for in the Warrant Agreement) at the principal corporate trust office of the Warrant Agent. In the event that upon
any exercise of Warrants evidenced hereby the number of Warrants exercised shall be less than the total number of Warrants evidenced
hereby, there shall be issued to the holder hereof or his, her or its assignee, a new Warrant Certificate evidencing the number
of Warrants not exercised.

 

Notwithstanding anything
else in this Warrant Certificate or the Warrant Agreement, no Warrant may be exercised unless at the time of exercise (i) a registration
statement covering the shares of Common Stock to be issued upon exercise is effective under the Securities Act and (ii) a prospectus
thereunder relating to the shares of Common Stock is current, except through “cashless exercise” as provided for in
the Warrant Agreement.

 

The Warrant Agreement
provides that upon the occurrence of certain events the number of shares of Common Stock issuable upon exercise of the Warrants
set forth on the face hereof may, subject to certain conditions, be adjusted. If, upon exercise of a Warrant, the holder thereof
would be entitled to receive a fractional interest in a share of Common Stock, the Company shall, upon exercise, round down to
the nearest whole number of shares of Common Stock to be issued to the holder of the Warrant.

 

Warrant Certificates,
when surrendered at the principal corporate trust office of the Warrant Agent by the Registered Holder thereof in person or by
legal representative or attorney duly authorized in writing, may be exchanged, in the manner and subject to the limitations provided
in the Warrant Agreement, but without payment of any service charge, for another Warrant Certificate or Warrant Certificates of
like tenor evidencing in the aggregate a like number of Warrants.

 

Upon due presentation
for registration of transfer of this Warrant Certificate at the office of the Warrant Agent a new Warrant Certificate or Warrant
Certificates of like tenor and evidencing in the aggregate a like number of Warrants shall be issued to the transferee(s) in exchange
for this Warrant Certificate, subject to the limitations provided in the Warrant Agreement, without charge except for any tax or
other governmental charge imposed in connection therewith.

 

The Company and the
Warrant Agent may deem and treat the Registered Holder(s) hereof as the absolute owner(s) of this Warrant Certificate (notwithstanding
any notation of ownership or other writing hereon made by anyone), for the purpose of any exercise hereof, of any distribution
to the holder(s) hereof, and for all other purposes, and neither the Company nor the Warrant Agent shall be affected by any notice
to the contrary. Neither the Warrants nor this Warrant Certificate entitles any holder hereof to any rights of a stockholder of
the Company.

 

    3

     

    

 

Election
to Purchase

(To Be Executed
Upon Exercise of Warrant)

 

The undersigned hereby
irrevocably elects to exercise the right, represented by this Warrant Certificate, to receive shares of Common Stock and herewith
tenders payment for such shares of Common Stock to the order of CENAQ Energy Corp. (the “Company”) in the amount
of $ in accordance with the terms hereof. The undersigned requests that a certificate for such shares of Common Stock be registered
in the name of , whose address is and that such shares of Common Stock be delivered to whose address is . If
said number of shares of Common Stock is less than all of the shares of Common Stock purchasable hereunder, the undersigned requests
that a new Warrant Certificate representing the remaining balance of such shares of Common Stock be registered in the name of ,
whose address is and that such Warrant Certificate be delivered to , whose address is .

 

In the event that the
Warrant has been called for redemption by the Company pursuant to Article VI of the Warrant Agreement and the Company has required
cashless exercise pursuant to as set forth in the Warrant Agreement, the number of shares of Common Stock that this Warrant is
exercisable for shall be determined in accordance with as set forth in the Warrant Agreement.

 

In the event that the
Warrant is a Private Placement Warrant that is to be exercised on a “cashless” basis pursuant to as set forth in the
Warrant Agreement, the number of shares of Common Stock that this Warrant is exercisable for shall be determined in accordance
with as set forth in the Warrant Agreement.

 

In the event that the
Warrant is to be exercised on a “cashless” basis pursuant to as set forth in the Warrant Agreement, the number of shares
of Common Stock that this Warrant is exercisable for shall be determined in accordance with as set forth in the Warrant Agreement.

 

In the event that the
Warrant may be exercised, to the extent allowed by the Warrant Agreement, through cashless exercise (i) the number of shares of
Common Stock that this Warrant is exercisable for would be determined in accordance with the relevant section of the Warrant Agreement
which allows for such cashless exercise and (ii) the holder hereof shall complete the following: The undersigned hereby irrevocably
elects to exercise the right, represented by this Warrant Certificate, through the cashless exercise provisions of the Warrant
Agreement, to receive shares of Common Stock. If said number of shares is less than all of the shares of Common Stock purchasable
hereunder (after giving effect to the cashless exercise), the undersigned requests that a new Warrant Certificate representing
the remaining balance of such shares of Common Stock be registered in the name of , whose address is and that such Warrant
Certificate be delivered to , whose address is .

 

[Signature Page Follows]

 

    4

     

    

 

	Date:        , 20	 
	 	(Signature)
	 	 
	 	 
	 	 
	 	 
	 	(Address)
	 	 
	 	 
	 	(Tax Identification Number)

 

	Signature Guaranteed:	 	 

 

THE SIGNATURE(S) SHOULD BE GUARANTEED BY
AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED
SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15 (OR ANY SUCCESSOR RULE)).

 

 

5

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