Document:

Exhibit 4.1

 

	
        NUMBER

        U-__________

         
	 	UNITS
	SEE REVERSE FOR

CERTAIN

 DEFINITIONS	CONSTELLATION ALPHA CAPITAL CORP.	 

  

CUSIP G2379F 124

 

UNITS CONSISTING OF ONE ORDINARY SHARE,
ONE RIGHT AND ONE WARRANT

 

THIS CERTIFIES THAT_________________________________________________________________
is the owner of ___________________________________________________________________________ Units.

 

Each Unit (“Unit”)
consists of one (1) ordinary share, no par value per share, of CONSTELLATION ALPHA CAPITAL CORP., a British Virgin Islands company
(the “Company”), one (1) right (“Right”) and one (1) warrant (the “Warrants”). Each holder
of a Right is entitled to receive one-tenth (1/10) of an ordinary share upon the Company’s completion of an acquisition,
share exchange, share reconstruction and amalgamation, contractual control arrangement or other similar business combination with
one or more businesses or entities (a “Business Combination”). Each Warrant entitles the holder to purchase one half
(1/2) of one ordinary share for $11.50 per whole share (subject to adjustment) and may only be exercised for a whole number of
ordinary shares. Each Warrant will become exercisable commencing on the later of (a) one year from the date of the final prospectus
relating to the Company’s initial public offering (the “Final Prospectus”) and (b) the Company’s completion
of a Business Combination and will expire unless exercised before 5:00 p.m., New York City Time, five years after the completion
by Company of an initial Business Combination (the “Expiration Date”). The ordinary share, Rights and Warrants comprising
the Units represented by this certificate are not transferable separately prior to the fifty-second (52nd) day after the date of
the Final Prospectus, unless Cowen and Company, LLC determines that an earlier date is acceptable, subject to certain conditions
described in the Final Prospectus. The terms of the Rights are set forth in the Final Prospectus as well as a Rights Agreement,
dated as of _______, 2017 between the Company and Continental Stock Transfer & Trust Company, and are subject to the terms
and provisions contained therein, all of which terms and provisions the holder of this certificate consents to by acceptance hereof.
The terms of the Warrants are governed by a Warrant Agreement, dated as of _______, 2017, between the Company and Continental Stock
Transfer & Trust Company, as Warrant Agent, and are subject to the terms and provisions contained therein, all of which terms
and provisions the holder of this certificate consents to by acceptance hereof. Copies of the Rights Agreement and the Warrant
Agreement are on file at the office of the Warrant Agent at 1 State Street, 30th Floor, New York, New York 10004, and
are available to any Right holder or Warrant holder on written request and without cost.

 

This certificate is
not valid unless countersigned by the Transfer Agent and Registrar of the Company. This certificate shall be governed by and construed
in accordance with the internal laws of the State of New York.

 

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

 

	By	 	 	 
	 	 	SEAL	 
	 	Chief Executive Officer	2017	Chief Financial Officer

 

     

     

    

 

CONSTELLATION ALPHA CAPITAL CORP.

 

The Company will furnish
without charge to each unitholder who so requests, a statement of the powers, designations, preferences and relative, participating,
optional or other special rights of each class of shares or series thereof of the Company and the qualifications, limitations,
or restrictions of such preferences and/or rights.

 

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 and not as tenants in common Act ______________
	 	 	 	(State)

   

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

  

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)

         

	 
	 
	 

 

	 

 

Units represented by the within Certificate, and do
hereby irrevocably constitute and appoint___________________________________________________________________________Attorney to
transfer the said Units on the books of the within named Company 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) 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 UNDER THE SECURITIES ACT OF 1933, AS AMENDED).

   

In each case, as more fully described in
the Company’s Final Prospectus, the holder of this certificate shall be entitled to receive funds from the trust fund only
in the event of the Company’s required redemption upon failure to consummate a business combination or if the holder seeks
to redeem its shares upon consummation of such business combination or in connection with certain amendments to the Company’s
Amended and Restated Memorandum and Articles of Association. In no other circumstances shall the holder have any right or interest
of any kind in or to the trust fund.Exhibit 4.2 

 

	NUMBER   	SHARES
	 	 
	                   C	 

CONSTELLATION ALPHA
CAPITAL CORP.

 

INCORPORATED UNDER
THE LAWS OF THE BRITISH VIRGIN ISLANDS

 

ORDINARY SHARES

 

SEE REVERSE FOR

CERTAIN DEFINITIONS

 

	This Certifies that	 	CUSIP G2379F 108
	 	 	 
	 	 	 
	is the owner of	 	 

 

FULLY PAID AND NON-ASSESSABLE ORDINARY
SHARES OF NO PAR VALUE OF

 

CONSTELLATION ALPHA CAPITAL CORP.

 

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

The Company will be forced to redeem
all of the ordinary shares sold in its initial public offering if it is unable to complete an initial business combination within
twenty-four months from the closing of the Company’s initial public offering, as more fully described in the Company’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 Company and the facsimile signatures of its duly authorized officers.

 

	Dated:	 	 
	 	 	 
	 	SEAL	 
	CHIEF EXECUTIVE OFFICER	2017	CHIEF FINANCIAL OFFICER

 

     

     

    

 

	 

  

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 Act	under Uniform Gifts to Minors Act ______________ (State)

  

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

 

CONSTELLATION ALPHA CAPITAL CORP.

 

The Company will furnish
without charge to each shareholder who so requests the powers, designations, preferences and relative, participating, optional
or other special rights of each class of shares or series thereof of the Company 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 Amended and Restated Memorandum and Articles of Association and all amendments thereto and resolutions
of the Board of Directors providing for the issue of Preferred Shares (copies of which may be obtained from the secretary of the
Company), 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)
	 
	 
	 
	 
	ordinary shares represented by the within Certificate, and do hereby irrevocably constitute and appoint
	 
	Attorney to transfer the said shares on the books of the within named Company 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) 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 UNDER THE SECURITIES ACT OF 1933, AS AMENDED).	 

 

In each case, as more fully described in
the Company’s final prospectus dated [________ __], 2017, the holder of this certificate shall be entitled to receive funds
from the trust fund only in the event of the Company’s required redemption upon failure to consummate a business combination
or if the holder seeks to redeem its shares upon consummation of such business combination or in connection with certain amendments
to the Company’s Amended and Restated Memorandum and Articles of Association. In no other circumstances shall the holder
have any right or interest of any kind in or to the trust fund.

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