Document:

Exhibit 4.2

 

NUMBER

 

	 	NUMBER
	 	C 

        SHARES

	 	SEE
    REVERSE FOR
	 	CERTAIN
    DEFINITIONS
	 	CUSIP
    42588L 105

 

HENNESSY
CAPITAL ACQUISITION CORP. III 

INCORPORATED
UNDER THE LAWS OF THE STATE OF DELAWARE

 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 COMMON STOCK OF

 

HENNESSY
CAPITAL ACQUISITION CORP. III

(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 common stock if it is unable to complete a business combination by ___________,
20___ or as more fully described in the Corporation’s final prospectus dated             ,
2017.

 

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.

 

	 	[Corporate
    Seal]	 
	Secretary	Delaware	President

 

     

     

    

 

HENNESSY
CAPITAL ACQUISITION CORP. III

 

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 	 	 	Under
    Uniform Gifts to Minors
	 	 	of
    survivorship and not as tenants in common	 	 
	 	 	 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.

 

    	 	2	 

     

    

 

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             ,
2017, 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 common
stock sold in its initial public offering and liquidates because it does not consummate an initial business combination by __________,
2019, (ii) the Corporation redeems the shares of common stock sold in its initial public offering in connection with a stockholder
vote to approve an amendment to any provision of the Corporation’s amended and restated certificate of incorporation relating
to stockholders’ rights or pre-initial business combination activity, or (iii) if the holder(s) seek(s) to redeem for cash
his, her or its respective shares of 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.

 

 

3Exhibit 4.3

 

[Form of 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

 

HENNESSY CAPITAL ACQUISITION CORP. III 

Incorporated Under the Laws of the State
of Delaware

 

CUSIP 42588L 113

 

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 Common Stock, $.0001 par value (“Common Stock”), of Hennessy Capital Acquisition Corp.
III, a Delaware corporation (the “Company”). Each whole 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 whole Warrant
is initially exercisable for one fully paid and non-assessable share of Common Stock. No fractional shares will be issued upon
exercise of any Warrant. If, upon the exercise of Warrants, a holder would be entitled to receive a fractional interest in a share
of Common Stock, the Company will, upon exercise, round down to the nearest whole number the number of shares of Common Stock to
be issued to the Warrant holder. 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.

 

	 	HENNESSY CAPITAL ACQUISITION CORP.  III
	 	 	 
	 	By:	 
	 	 	Name:
	 	 	Title:
	 	 	 
	 	CONTINENTAL STOCK TRANSFER & TRUST COMPANY as Warrant Agent
	 	 	 
	 	By:	 
	 	 	Name:
	 	 	Title:

 

    	 		 

    

    

 

[Form of Warrant Certificate]

 

[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             ,
2017 (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.

 

    	 	2	 

    

    

 

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 Hennessy Capital Acquisition Corp.
III (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 Section 6 of the Warrant Agreement
and the Company has required cashless exercise pursuant to Section 6.3 of the Warrant Agreement, the number
of shares of Common Stock that this Warrant is exercisable for shall be determined in accordance with subsection 3.3.1(b) and Section 6.3 of
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 subsection
3.3.1(c) of the Warrant Agreement, the number of shares of Common Stock that this Warrant is exercisable for shall be
determined in accordance with subsection 3.3.1(c) of the Warrant Agreement.

 

In the event that
the Warrant is to be exercised on a “cashless” basis pursuant to Section 7.4 of the Warrant Agreement,
the number of shares of Common Stock that this Warrant is exercisable for shall be determined in accordance with Section 7.4 of
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]

 

    	 	3	 

    

    

 

 

	 	 	 	 	 
	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)).

 

 

 

4

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