Document:

Exhibit 4.1

 

	
    Number

    U-
	 	Units

 

CUSIP [●]

 

SEE REVERSE FOR CERTAIN DEFINITIONS

 

CONCORD Acquisition
Corp III

 

UNITS CONSISTING
OF ONE SHARE OF CLASS A COMMON STOCK AND ONE-

THIRD 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 Concord Acquisition Corp III, a Delaware
corporation (the “Company”), and one-third of one redeemable warrant (each whole warrant, a “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 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 Common Stock
and Warrants comprising the Units represented by this certificate are not transferable separately prior to __________, 2021, unless the
representatives of the underwriters elect 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 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 and only whole Warrants will trade. 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.

 

Upon the consummation of the Business Combination,
the Units represented by this certificate will automatically separate into the Common Stock and Warrants comprising such Units.

 

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 signatures of the duly authorized
officers of the Company.

 

	 	 	 
	Secretary	 	Chief Executive Officer

 

     

     

    

 

Concord Acquisition 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 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 sells,
assigns and transfers 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 does 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 whatsoever.

 

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 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 in the Company’s amended and restated certificate
of incorporation, (ii) the Company redeems 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 Company’s
obligation to allow redemption in connection with the Company’s initial business combination or to redeem 100% of the Common Stock
if it does not consummate an initial business combination by the date set forth in the Company’s amended and restated certificate
of incorporation or (b) with respect to any other 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.Exhibit 4.2

 

	NUMBER	SHARES
	C-	 
	 	CUSIP  [●]

 

SEE REVERSE FOR CERTAIN DEFINITIONS

 

CONCORD Acquisition
Corp III

 

INCORPORATED UNDER
THE LAWS OF THE STATE OF DELAWARE

CLASS A COMMON STOCK

 

This Certifies that ______________________is the
owner of _______________________

 

FULLY PAID
AND NON-ASSESSABLE SHARES OF THE PAR VALUE OF $0.0001 EACH OF THE

 CLASS A COMMON STOCK OF CONCORD Acquisition Corp III

(THE “COMPANY”)

 

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
shares of Class A common stock if it does not complete a business combination by the date set forth in the Company’s amended and
restated certificate of incorporation, as the same may be amended from time to time, all as more fully described in the Company’s
final prospectus dated __________, 2021.

 

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.

 

 
	Secretary	 	Chief Executive Officer

 

     

     

    

 

CONCORD Acquisition
Corp III

 

The Company will furnish without charge to each
stockholder 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. 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 certificate of incorporation and all amendments thereto and resolutions of the Company’s Board of Directors
providing for the issue of securities (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	 
	 	 	 	 	 	 	 	 
	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 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 of the Class A common stock
represented by the within Certificate, and hereby irrevocably constitutes and appoints____________ Attorney to transfer the
said stock on the books of the within named Company with full power of substitution in the premises.

 

Dated: _________

 

	 	 
	 	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) UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED).	 	 
	 	 	 

 

     

     

    

 

In each case, as more fully 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 Class A 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 in the Company’s amended and
restated certificate of incorporation, (ii) the Company redeems the shares of Class A 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 Company’s obligation to allow redemptions in connection with its initial business combination or to
redeem 100% of the Class A common stock if it does not consummate an initial business combination by the date set forth in the Company’s
amended and restated certificate of incorporation or (b) with respect to any other 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 Class A 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.

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