Exhibit 4.1


 


NUMBER UNITS


U-


 


 


SEE REVERSE FOR CERTAIN DEFINITIONS


 


CUSIP [●]


 


ATLAS CREST INVESTMENT CORP. III


 


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 share of Class A common stock, par value $0.0001 per share (“Common Stock”), of Atlas
Crest Investment Corp. III, a Delaware corporation (the “Company”), and one-fourth 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 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 (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 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


 









     


     


    

 


Atlas Crest Investment Corp. III


 


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 	                                   
	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).


 


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.


 



    2