Document:

EX-4.1

 Exhibit 4.1 

NUMBER UNITS 
 U- 

SEE REVERSE FOR CERTAIN DEFINITIONS 

CUSIP                  

CASCADIA ACQUISITION CORP. 

UNITS CONSISTING OF ONE SHARE OF CLASS A COMMON STOCK AND ONE-HALF OF ONE REDEEMABLE WARRANT, EACH
WHOLE WARRANT ENTITLING THE HOLDER TO PURCHASE ONE SHARE OF CLASS A COMMON STOCK 
 THIS CERTIFIES THAT
                     is the owner of Units. 

Each Unit (“Unit”) consists of one share of Class A common stock, par value $0.0001 per share (“Common
Stock”), of Cascadia Acquisition Corp., a Delaware corporation (the “Company”), and one-half of one redeemable warrant (the “Warrant”). Each whole
Warrant entitles the holder to purchase one share of Common Stock for $11.50 per share (subject to adjustment). Only whole Warrants are exercisable. Each whole Warrant will become exercisable on the later of (i) thirty (30) days after the
completion of the Company’s initial business combination and (ii) twelve (12) months from the closing of the Company’s initial public offering, and will expire unless exercised five (5) years after the completion of our initial
business combination or earlier upon redemption or our liquidation (the “Expiration Date”). The Common Stock and Warrants comprising the Units represented by this certificate are not transferable separately prior to
                , 2021, unless Cantor Fitzgerald & Co. 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
                , 2021, 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

 Cascadia 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
                    

                
(Cust)          (Minor) 
under Uniform Gifts to Minors Act

                          
  
 (State)

						
	TEN ENT	  	–  	  	as tenants by the entireties	  		  		  	
						
	JT TEN	  	–  	  	as joint tenants with right of survivorship and not as tenants in common	  		  		  	

 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 (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                 , 2021, 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 only in the event that (i) the Company redeems the shares of Common Stock sold in the Company’s initial public
offering and liquidates because it does not consummate an initial business combination by the date (the “Last 

 
Date”) set forth in the Company’s Amended and Restated Certificate of Incorporation, as the same may be amended from time to time (the “Charter”), (ii) the
Company redeems the shares of Common Stock sold in its initial public offering properly submitted in connection with a stockholder vote to amend the Charter to modify the substance or timing of the Company’s obligation to redeem 100% of the
Common Stock if it does not consummate an initial business combination by the Last Date or with respect to any other material provisions 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 Company 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.EX-4.2

 Exhibit 4.2 
  

			
	 NUMBER

C-                
	  	 SHARES

CUSIP                 

	 SEE REVERSE FOR CERTAIN DEFINITIONS
	  	

 CASCADIA ACQUISITION CORP. 

CLASS A COMMON STOCK 

THIS CERTIFIES THAT                     
is the owner of fully paid and non-assessable shares of Class A common stock, par value $0.0001 per share (the “Common Stock”), of Cascadia Acquisition Corp., a Delaware
corporation (the “Company”), transferable on the books of the Company in person or by duly authorized attorney upon surrender of this certificate properly endorsed. 

This certificate is not valid unless countersigned by the Transfer Agent and registered by the Registrar of the Company. 

Witness the facsimile signature of a duly authorized signatory of the Company. 

 

					
	  
	 		 	  

	Authorized Signatory	 		 	Transfer Agent

 CASCADIA ACQUISITION CORP. 

The Company will furnish without charge to each stockholder 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. This certificate and the shares represented
thereby are issued and shall be held subject to all the provisions of the Company’s Amended and Restated 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 Company), 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
                

                
(Cust)          (Minor) 
under Uniform Gifts to Minors Act

                          
  
 (State)

						
	TEN ENT	  	–  	  	as tenants by the entireties	  		  		  	
						
	JT TEN	  	–  	  	as joint tenants with right of survivorship and not as tenants in common	  		  		  	

 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(S), OF ASSIGNEE(S)) 

                 shares of Common Stock represented by the within
Certificate, and hereby irrevocably constitutes and appoints 

                     Attorney to transfer the said shares
of Common Stock on the books of the within named Company 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.

 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 (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                 , 2021, 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 only in the event that (i) the Company redeems the shares of Common
Stock sold in the Company’s initial public offering and liquidates because it does not consummate an initial business combination by the date (the “Last Date”) set forth in the Company’s Amended and Restated Certificate of
Incorporation, as the same may be amended from time to time (the “Charter”), (ii) the Company redeems the shares of Common Stock sold in its initial public offering properly submitted in connection with a stockholder vote to amend the
Charter to modify the substance or timing of the Company’s obligation to redeem 100% of the Common Stock if it does not consummate an initial business combination by the Last Date or with respect to any other material provisions 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 Company 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.

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