Exhibit 4.1


 


	NUMBER	UNITS
	U-	 


 


SEE REVERSE FOR CERTAIN DEFINITIONS


 


CUSIP [     ]


 


Iron Spark I Inc.


 


UNITS CONSISTING OF ONE SHARE OF COMMON STOCK
AND ONE-HALF OF ONE WARRANT


 


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 Iron Spark I Inc., a Delaware corporation (the “Company”), and one-half of one redeemable
warrant (the “Warrant”). Each whole Warrant initially entitles the holder to purchase one (1) 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 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”), or (ii) twelve (12) months from the closing of the Company’s initial public offering, and,
unless exercised earlier, will expire at 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 thereof or Company’s liquidation. The Common
Stock and Warrants comprising the Units represented by this certificate are not transferable separately prior to [•], 2021,
unless Oppenheimer & Co., Inc. 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 the Company issuing a press release announcing when separate
trading will begin. 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 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 and Registrar


 






     


     


    

 


Iron Spark I Inc.


 


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	 	 
	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).	 


 






     


     


    

 


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 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 [•], 2023 (or such later date as the Company’s amended and restated certificate of incorporation
may be amended to provide for), (ii) the Company offers to redeem the shares of Common Stock sold in its initial public offering
in connection with a stockholder vote to amend the Company’s amended and restated certificate of incorporation (A) to modify the
substance or timing of the ability of holders of Common Stock sold in the Company’s initial public offering to seek redemption in
connection with the Company’s initial business combination or the Company’s obligation to redeem 100% of such Common Stock
if it does not consummate an initial business combination by [•], 2023 or (B) with respect to any other provision relating to stockholders’
rights or pre-initial business combination activity, and the holder(s) of this certificate elects to have the shares of Common Stock held
by him, her or it redeemed pursuant to that offer, 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.