Document:

Exhibit 4.2

 

	NUMBER	SHARES

 

______C

 

BLACK
RIDGE ACQUISITION CORP.

 

INCORPORATED
UNDER THE LAWS OF THE STATE OF DELAWARE

 

COMMON
STOCK

 

SEE
REVERSE FOR

CERTAIN DEFINITIONS

 

	This
    Certifies that 	CUSIP
    09216T 107

 

is
the owner of

 

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

 

BLACK
RIDGE ACQUISITION CORP.

 

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 liquidate if it is unable to complete an initial business combination within the period of time
as set forth in the Corporation’s Amended and Restated Certificate of Incorporation, as the same may be amended from time
to time, all 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 facsimile seal of the Corporation and the facsimile signatures of its duly authorized officers.

 

Dated:

	 	 	 
	 

                                                

                                                
	 	 
	CHAIRMAN	SECRETARY
	 	 

 

    

     

    

 

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	 	under
    Uniform Gifts to Minors
	 	and
    not as tenants in common	 	Act
    ______________
	 	 	 	(State)

 

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

 

Black
Ridge Acquisition 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 shares of Preferred Stock (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.

 

For
value received, ___________________________ hereby sell, assign and transfer unto

 

 

	PLEASE
    INSERT SOCIAL SECURITY OR OTHER 

    IDENTIFYING NUMBER OF ASSIGNEE
	 

                                         

 

	 	 
	(PLEASE
    PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)
	 	 
	 	 
	 	 
	 	 
	 	 shares
	 	 
	of the capital stock represented by the within
    Certificate, and do hereby irrevocably constitute and appoint	 

 

	 	 Attorney
	to transfer the said stock on the books of
    the within named Corporation will full power of substitution in the premises.	 

 

Dated
  ______________________

 

		Notice:	The
                                         signature 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:

	 

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).

 

The
holder(s) of this certificate shall be entitled to receive a pro-rata portion of the funds from the trust account only in the
event that (i) the Corporation is forced to liquidate because it does not consummate an initial business combination within the
period of time set forth in the Corporation’s Amended and Restated Certificate of Incorporation, as the same may be amended
from time to time (the “Charter”) or (ii) if the holder seeks to convert his shares upon consummation of, or sell
his shares in a tender offer in connection with, an initial business combination or in connection with certain amendments to the
Charter. 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

 

	NUMBER

         

        ________-
	 	(SEE
REVERSE SIDE FOR LEGEND)

        THIS
        WARRANT WILL BE VOID IF NOT EXERCISED PRIOR TO THE EXPIRATION DATE (DEFINED BELOW)
	 	WARRANTS

 

BLACK
RIDGE ACQUISITION CORP.

 

CUSIP
09216T 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 Common Stock, par value $0.0001 per share (“Shares”), of Black Ridge 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) ______________, 2017, such number of Shares of the Company as set forth above, 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 on each of 20 trading days within any 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

 

	 	 	 	 
	 	Secretary	 	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.

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