Exhibit 4.1


 


	NUMBER	UNITS
	U-	 


 


SEE REVERSE FOR CERTAIN DEFINITIONS


 


CUSIP 349875 203


 


FORUM MERGER IV CORPORATION 


 


UNITS CONSISTING OF ONE SHARE OF CLASS
A COMMON STOCK AND ONE-FOURTH 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 (1) share of Class A common stock, par value $0.0001 per share (“Common Stock”), of Forum
Merger IV Corporation, a Delaware corporation (the “Company”), and one-fourth of one redeemable warrant
(the “Warrant”). Each whole Warrant entitles the holder to purchase one (1) share (subject to adjustment)
of Common Stock for $11.50 per share (subject to adjustment). Only whole Warrants are exercisable. Each whole Warrant will become
exercisable thirty (30) days after the Company’s completion of a merger, capital stock exchange, asset acquisition, stock
purchase, reorganization or other similar business combination with one or more businesses (each a “Business Combination”),
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 Common Stock and Warrants comprising the Units represented by this certificate are not transferable separately
prior to           , 2021, unless Jefferies 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         , 2021 (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


 




     


     


    

 


Forum Merger IV Corporation


 


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 stock 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)
	TEN ENT	—	as tenants by the entireties	 	 	 	 
	 	 	 	 	 	 	Under Uniform Gifts to Minors Act
	JT TEN	—	as joint tenants with right of survivorship and not as tenants in common	 	 	 	
        _____________________________

        (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       , 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 set forth (the “Last Date”) 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.