Exhibit 4.3


 


	NUMBER	 	(SEE REVERSE SIDE FOR LEGEND)	 	WARRANTS
	 	 	 	 	 
	
        __________–

        
	 	
        THIS WARRANT WILL BE VOID IF NOT EXERCISED
        PRIOR TO

        THE EXPIRATION DATE (DEFINED
BELOW)

        
	 	 


 


MTECH ACQUISITION CORP.


 


 


CUSIP 55378W 115                    


 


WARRANT


 


THIS CERTIFIES THAT, for value received


 


is the registered holder of a warrant or
warrants (the “Warrant(s)”) to purchase one fully paid and non-assessable share of Class A Common Stock, par value
$0.0001 per share (“Shares”), MTech Acquisition Corp., a Delaware corporation (the “Company”), expiring
at 5:00 p.m., New York City time, on the five year anniversary (the “Expiration Date”) of the completion by the Company
of a merger, share exchange, asset acquisition, stock purchase, recapitalization, reorganization or other similar business combination
with one or more businesses or entities (a “Business Combination”). The Warrant entitles the holder thereof to purchase
from the Company, commencing on the later of (i) 30 days after the Company’s completion of a Business Combination and (ii)                     ,
2019, such number of Shares of the Company at the price of $11.50 per share, upon surrender of this Warrant Certificate and payment
of the Warrant Price at the office or agency of the Warrant Agent, Continental Stock Transfer & Trust Company, but only subject
to the conditions set forth herein and in the Warrant Agreement between the Company and Continental Stock Transfer & Trust
Company. In no event will the Company be required to net cash settle the warrant exercise. The Warrant Agreement provides that
upon the occurrence of certain events the Warrant Price and the number of Warrant Shares purchasable hereunder, set forth on the
face hereof, may, subject to certain conditions, be adjusted. The term Warrant Price as used in this Warrant Certificate refers
to the price per Share at which Shares may be purchased at the time the Warrant is exercised.


 


No fraction of a Share will be issued upon
any exercise of a Warrant. If the holder of a Warrant would be entitled to receive a fraction of a Share upon any exercise of a
Warrant, the Company shall, upon such exercise, round up to the nearest whole number the number of Shares to be issued to such
holder.


 


Upon any exercise of the Warrant for less
than the total number of full Shares provided for herein, there shall be issued to the registered holder hereof or the registered
holder’s assignee a new Warrant Certificate covering the number of Shares for which the Warrant has not been exercised.


 


Warrant Certificates, when surrendered
at the office or agency of the Warrant Agent by the registered holder hereof in person or by 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 and evidencing in the aggregate a like number of
Warrants.


 


Upon due presentment for registration of
transfer of the Warrant Certificate at the office or agency 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 in exchange for this
Warrant Certificate, subject to the limitations provided in the Warrant Agreement, without charge except for any applicable tax
or other governmental charge.


 


The Company and the Warrant Agent may deem
and treat the registered holder as the absolute owner 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 registered holder, and
for all other purposes, and neither the Company nor the Warrant Agent shall be affected by any notice to the contrary.


 


This Warrant does not entitle the registered
holder to any of the rights of a stockholder of the Company.


 






     


     


    

 


The Company reserves the right to call
the Warrant at any time prior to its exercise, with a notice of call in writing to the holders of record of the Warrant, giving
30 days’ notice of such call at any time after the Warrant becomes exercisable if the last sale price of the Shares has been
at least $18.00 per share for any 20 trading days within a 30 trading day period ending on the third business day prior to the
date on which notice of such call is given, if, and only if, there is a current registration statement in effect with respect to
the Shares underlying the Warrant. The call price of the Warrants is to be $0.01 per Warrant. Any Warrant either not exercised
or tendered back to the Company by the end of the date specified in the notice of call shall be canceled on the books of the Company
and have no further value except for the $0.01 call price.


 


	By  	 	 	 
	 	 	 	 
	 	Chief Executive Officer	 	Chairman of the Board


  






     


     


    

 


SUBSCRIPTION FORM


 


To Be Executed by the Registered Holder
in Order to Exercise Warrants


 


The undersigned Registered Holder irrevocably elects to exercise                      Warrants
represented by this Warrant Certificate, and to purchase the shares of Common Stock issuable upon the exercise of such Warrants,
and requests that Certificates for such shares shall be issued in the name of





	 
	(PLEASE TYPE OR PRINT NAME AND ADDRESS)
	 
	 
	 
	 
	 
	(SOCIAL SECURITY OR TAX IDENTIFICATION NUMBER)


	and be delivered to 	 
	 	(PLEASE PRINT OR TYPE NAME AND ADDRESS)


  


and, if such number of Warrants shall not be all the Warrants
evidenced by this Warrant Certificate, that a new Warrant Certificate for the balance of such Warrants be registered in the name
of, and delivered to, the Registered Holder at the address stated below:





	 	 	 	 	 
	Dated:	 	 	(SIGNATURE)   	 
	 	 	 	 	 
	 	 	 	 	 
	 	 	 	(ADDRESS)   	 
	 	 	 	 	 
	 	 	 	 	 
	 	 	 	 	 
	 	 	 	 	 
	 	 	 	(TAX IDENTIFICATION NUMBER)   	 


  






     


     


    




 


ASSIGNMENT


 


To Be Executed by the Registered Holder
in Order to Assign Warrants


 


For Value Received,                      hereby
sell, assign, and transfer unto


 


	 
	(PLEASE TYPE OR PRINT NAME AND ADDRESS)
	 
	 
	 
	 
	 
	(SOCIAL SECURITY OR TAX IDENTIFICATION NUMBER)


	and be delivered to	 	 
	 	 	(PLEASE PRINT OR TYPE NAME AND ADDRESS)


   


                                          
                    of
the Warrants represented by this Warrant Certificate, and hereby irrevocably constitute and appoint                                          
                    Attorney
to transfer this Warrant Certificate on the books of the Company, with full power of substitution in the premises.


 


	Dated:	 	 	 	 
	 	 	 	(SIGNATURE)	 


   


the
signature to the assignment of the subscription form must correspond to the name written upon the face of this warrant certificate
in every particular, without alteration or enlargement or any change whatsoever, and must be guaranteed by a commercial bank or
trust company or a member firm of the american stock exchange, new york stock exchange, pacific stock exchange or chicago
stock exchange.