EX-4.1





 Exhibit 4.1 
  

			
	 NUMBER
	  	UNITS
	 U-
	  	
		
	 SEE REVERSE FOR CERTAIN DEFINITIONS
	  	
		  	CUSIP G2283K 128

 COLONNADE ACQUISITION CORP. 

UNITS CONSISTING OF ONE CLASS A ORDINARY SHARE AND ONE-HALF OF ONE REDEEMABLE WARRANT, 

EACH WHOLE WARRANT ENTITLING THE HOLDER TO PURCHASE ONE CLASS A ORDINARY SHARE 

THIS CERTIFIES THAT                  is the owner of
                 Units of Colonnade Acquisition Corp, a Cayman Islands exempted company (the “Company”), transferrable on the books of the Company in person or
by duly authorized attorney upon surrender of this certificate properly endorsed. 
 Each Unit (“Unit”) consists of
one (1) Class A ordinary share, par value $0.0001 per share (“Ordinary Share”), of the Company, and one-half of one redeemable warrant (each whole warrant, a
“Warrant”). Each Warrant entitles the holder to purchase one Ordinary Share (subject to adjustment) for $11.50 per share (subject to adjustment). Each Warrant will become exercisable on the later of (i) thirty (30) days
after the Company’s completion of a merger, share exchange, asset acquisition, share purchase, reorganization or other similar business combination with one or more businesses (each a “Business Combination”), or
(ii) twelve (12) months from the closing of the Company’s initial public offering, and will expire unless exercised before 5:00 p.m., New York City Time, on the date that is five (5) years after the date on which the Company completes
its initial Business Combination, or earlier upon redemption or liquidation (the “Expiration Date”). The Ordinary Shares and Warrants comprising the Units represented by this certificate are not transferable separately prior
to                 , 2020, unless BTIG, LLC elects to allow separate trading earlier, subject to the Company’s filing of a Current Report on Form 8-K with the Securities and Exchange Commission containing an audited balance sheet reflecting the Company’s receipt of the gross proceeds of the Company’s initial public offering and issuing a press
release announcing when separate trading will begin. No fractional Warrants will be issued upon separation of the Units. The terms of the Warrants are governed by a Warrant Agreement, dated as of
                , 2020 (the “Warrant Agreement”), 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 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 Warrant holder on written request and without cost. 
 This
certificate is not valid unless countersigned by the Transfer Agent and registered by the 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 signature of a
duly authorized signatory of the Company. 
  

					
	  
	  		  	  

	Authorized Signatory	  		  	Transfer Agent













 Colonnade Acquisition 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 equity 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 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 with 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 EXCHANGE ACT OF 1934, AS AMENDED (OR ANY SUCCESSOR RULE)).
	  		  	

 As more fully described in, and subject to the terms and conditions described in, the Company’s final
prospectus for its initial public offering dated                 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 the Company’s initial public offering in the event that (i) the Company redeems the Ordinary Shares sold in
its initial public offering and liquidates because it does not consummate an initial Business Combination within the time period set forth in the Company’s Amended and Restated Memorandum and Articles of Association, as the same may be amended
from time to time, or (ii) if the holder(s) properly redeem for cash his, her or its respective Ordinary Shares included in the Units represented by this certificate in connection with (x) a tender offer (or proxy solicitation, solely in
the event the Company seeks shareholder approval of the proposed initial Business Combination) setting forth the details of a proposed initial Business Combination or (y) a shareholder vote to amend the Company’s Amended and Restated
Memorandum and Articles of Association (A) to modify the substance or timing of the Company’s obligation to allow redemption in connection with the Company’s initial business combination or to redeem 100% of the Ordinary Shares if it
does not consummate an initial Business Combination within the time set forth in the Company’s Amended and Restated Memorandum and Articles of Association or (B) with respect to any other material provisions relating to shareholders’
rights or pre-initial Business Combination activity, as the same may be amended from time to time. In no other circumstances shall the holder(s) have any right or interest of any kind in or to the trust
account.