Exhibit 4.1


 


	NUMBER	 	 	 	UNITS
	U-	 	 	 	 
	
    SEE REVERSE FOR

    CERTAIN

    DEFINITIONS
	 	AIB ACQUISITION CORPORATION 	 	 
	 	 	 	 	CUSIPG0R45S 

125


 


UNITS CONSISTING OF ONE CLASS A ORDINARY SHARE
AND ONE RIGHT,

EACH RIGHT ENTITLING THE HOLDER TO RECEIVE ONE-TENTH OF 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 (“Class A ordinary shares”), of AIB Acquisition Corporation, a Cayman
Islands exempted company (the “Company”) and one right (“Right”). Each Right entitles
the holder to receive one-tenth (1/10) of one Class A ordinary share, subject to adjustment upon the Company’s completion of an acquisition,
share exchange, share reconstruction and amalgamation, contractual control arrangement or other similar business combination with one
or more businesses or entities (each a “Business Combination”). The Class A ordinary shares and the Rights comprising
the Units represented by this certificate will begin separate trading on [] unless Maxim Group LLC elects to allow earlier separate trading,
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. The terms of the Rights are governed by a Rights Agreement, dated as of [], 2021, between the Company and
Continental Stock Transfer & Trust Company, as Rights 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 Rights Agreement are on file
at the office of the Rights Agent at One State Street, 30th Floor, New York, New York 10004, and are available to any Right 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 signatures of its duly authorized officers.


 


	By	 	 
	 	Chief Executive Officer	 


 






    


     


    

 


AIB ACQUISITION 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 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	 	under
    Uniform Gifts to Minors
	 	 	survivorship and not as
    tenants in common	 	 	 	 
	 	 		 	 	 	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)


 


represented by the within Certificate, and do hereby irrevocably
constitute and appoint


 


Attorney to transfer the said Units on the register of members 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) UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED).


 


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 a date calculated by reference to the Company’s Amended and Restated Memorandum and Articles of Association, (ii) the Company redeems
the 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 redeem 100% of the
Class A ordinary shares if it does not consummate an initial business combination by a date calculated by reference to the Company’s Amended
and Restated Memorandum and Articles of Association or (b) with respect to any other provision relating to shareholders’ rights or pre-initial
business combination activity, 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 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.