Document:

Specimen Unit Certificate

 Exhibit 4.1 

NUMBER UNITS 
 U- 

SEE REVERSE FOR CERTAIN DEFINITIONS 

CUSIP [●] 
 FORTRESS
CAPITAL ACQUISITION CORP. 
 UNITS CONSISTING OF ONE CLASS A ORDINARY SHARE AND ONE-FOURTH OF
ONE REDEEMABLE WARRANT TO PURCHASE ONE CLASS A ORDINARY SHARE 
 THIS CERTIFIES
THAT                is the owner of                Units. 

Each Unit (“Unit”) consists of one (1) Class A ordinary share, par value $0.0001 per share
(“Ordinary Shares”), of Fortress Capital Acquisition Corp., a Cayman Islands exempted company (the “Company”), and one-fourth (1/4) of one redeemable warrant
(each whole warrant, a “Warrant”). Each whole Warrant entitles the holder to purchase one (1) 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”), and (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                , 2021, unless Citigroup Global Markets Inc. and Goldman Sachs & Co. LLC elect 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 its 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. 
 Upon the consummation of the Business Combination,
the Units represented by this certificate will automatically separate into Ordinary Shares and Warrants comprising such Units. 
 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 signature of its duly authorized
officers. 
  

					
			
	   
	 		 	   

	 Secretary
	 		 	Chief Financial Officer

 FORTRESS CAPITAL 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 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 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 (OR ANY SUCCESSOR RULE).

  
 2 

 In each case, as more fully described in the Company’s final prospectus
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 its initial public offering only 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 by the date set forth in the Company’s amended and restated memorandum and articles of association, (ii) the Company redeems the Ordinary Shares sold in its initial public offering in connection with 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 Class A Ordinary Shares if it does not consummate an initial Business Combination by the date set forth in the Company’s amended and restated memorandum and articles of association or (B) with
respect to any other provision relating to the rights of holders of the Ordinary Shares or pre-initial Business Combination activity or (iii) if the holder(s) seek(s) to redeem for cash his, her or its
respective Ordinary Shares in connection with 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. In no other circumstances shall the holder(s) have any right or interest of any kind in or to the trust account. 

  
 3Specimen Class A Ordinary Share Certificate

 Exhibit 4.2 

NUMBER 
 C- 

SHARES 

SEE REVERSE FOR 

CERTAIN DEFINITIONS 

CUSIP [●] 

FORTRESS CAPITAL ACQUISITION CORP. 

INCORPORATED UNDER THE LAWS OF THE CAYMAN ISLANDS 

CLASS A ORDINARY SHARES 
  

			
	This Certifies that	  	 

  

			
	 is the owner of
	  	 

 FULLY PAID AND NON-ASSESSABLE CLASS A ORDINARY SHARES OF THE PAR VALUE OF US$0.0001
EACH OF 
 FORTRESS CAPITAL ACQUISITION CORP. 

(THE “COMPANY”) 
 Subject to the
Company’s amended and restated memorandum and articles of association and 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 its Class A ordinary shares if it is unable to complete a business combination by the date set forth in the
Company’s amended and restated memorandum and articles of association, all as more fully described in the Company’s final prospectus dated                 ,
2021. 
 This certificate is not valid unless countersigned by the Transfer Agent and registered by the Registrar of the Company. 

Witness the facsimile signatures of its duly authorized officers. 
  

					
	 [Title] 
	 		 	 [Title] 

			
	   
	 		 	   

 FORTRESS CAPITAL ACQUISITION 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 Company’s amended and restated memorandum and articles of association and all amendments thereto and resolutions of the Company’s 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	 	 
	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
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, OF ASSIGNEE(S))

	
	 
	
	 
	
	 
	 Shares represented by the within Certificate, and do hereby irrevocably constitutes and appoints

	
	 
	 Attorney to transfer the said shares 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: 

By 

	
	
	 
	
	 

 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). 

In each case, as more fully described in the Company’s final prospectus 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 its initial public offering only in the event that (i) the Company redeems the Class A ordinary shares sold in its initial public offering and liquidates because it does not consummate an
initial business combination by the date set forth in the Company’s amended and restated memorandum and articles of association, (ii) the Company redeems Class A ordinary shares sold in its initial public offering in connection with 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 its initial business
combination or to redeem 100% of the Class A ordinary shares if it does not consummate an initial business combination by the date set forth in the Company’s amended and restated memorandum and articles of association or (B) with
respect to any other provision relating to the rights of holders of the Class A ordinary shares or pre-initial business combination activity, 

  
 2 

 
or (iii) if the holder(s) seek(s) to redeem for cash his, her or its respective Class A ordinary shares in connection with a tender offer (or proxy solicitation, solely in the event the
Corporation seeks shareholder 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. 

  
 3

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