Exhibit 4.2


 


SPECIMEN CLASS A ORDINARY SHARE
CERTIFICATE


 


	NUMBER	 	SHARES


 


ALTIMAR ACQUISITION CORPORATION 


INCORPORATED UNDER THE LAWS OF THE CAYMAN
ISLANDS 


CLASS A ORDINARY SHARES


 


SEE REVERSE FOR 


CERTAIN DEFINITIONS


 


CUSIP [ ]


 


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 ALTIMAR ACQUISITION
CORPORATION (THE “COMPANY”)


 


Subject to the Company’s amended
and restated memorandum and articles of association, as the same may be amended from time to time, 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 within the period set forth in the Company’s
amended and restated memorandum and articles of association, as the same may be amended from time to time, all as more fully described
in the Company’s final prospectus dated [ ], 2020.


 


This certificate is not valid unless
countersigned by the Transfer Agent and registered by the Registrar.


 


Witness the facsimile signatures of its
duly authorized officers.


 


	Dated: 





	Chief Executive Officer	 	Cayman Islands	 	Chief Financial Officer
	 	 	 	 	 
	 	 	 	 	 
	 	 	 	 	 



 









    	 		 



     


    

 


ALTIMAR ACQUISITION CORPORATION


 


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, as the same may be amended
from time to time, and resolutions of the Board of Directors providing for the issue of Class A ordinary shares (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	 	 
	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	 	 	 	 	(Cust)	 	 	 	(Minor)
	 	 	 	 	 	 
	TEN ENT	 	—	 	as tenants by the entireties	 	 	 	 	 	under Uniform Gifts to Minors Act
	 	 	 	 	 	 
	 	 	 	 	 	 	 	 	 	 	(State)
	 	 	 	 	 	 	 	 
	JT TEN	 	—	 	as joint tenants with right of survivorship and not as tenants in common	 	 	 	 	 	 	 	 	 	 


 


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 does hereby irrevocably constitute and appoint Attorney to transfer the said shares on the books
of the within named Company with full power of substitution in the premises.


 


	Dated:	 	 	 	 	 	 
	 	 	 	 	 	 	 
	 	 	 	 	 	 	Shareholder
	 	 	 	 
	 	 	 	 	 	 	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 [ ], 2020, 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 within the period of time set forth in the Company’s amended
and restated memorandum and articles of association, as the same may be amended from time to time, (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) that would modify the substance or timing of the Company’s
obligation to provide holders of the Class A ordinary shares the right to have their shares redeemed in connection with the
Company’s initial business combination or to redeem 100% of the Class A ordinary shares if the Company does not complete
its initial business combination within the time period set forth therein or (B) with respect to any other provision relating
to the rights of holders of the Class A ordinary shares, 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.