Exhibit
4.3


 


Form
of Warrant Certificate


 


[FACE]


 


Number


Warrants


 


THIS
WARRANT SHALL BE VOID IF NOT EXERCISED PRIOR TO


 


THE
EXPIRATION OF THE EXERCISE PERIOD PROVIDED FOR


 


IN
THE WARRANT AGREEMENT DESCRIBED BELOW


 


TKB
CRITICAL TECHNOLOGIES 1


 


Incorporated
Under the Laws of the Cayman Islands


 


CUSIP
[●]


 


Warrant
Certificate


 


This
Warrant Certificate certifies that _____, or registered assigns, is the registered holder of warrant(s) evidenced hereby
(the “Warrants” and each, a “Warrant”) to purchase Class A ordinary shares, $0.0001
par value per share (the “Class A Ordinary Shares”), of TKB Critical Technologies 1, a Cayman Islands exempted
company (the “Company”). Each whole Warrant entitles the holder, upon exercise during the period set forth
in the Warrant Agreement referred to below, to receive from the Company that number of fully paid and non-assessable Class A Ordinary
Shares as set forth below, at the exercise price (the “Warrant Price”) as determined pursuant to the Warrant
Agreement, payable in lawful money (or through “cashless exercise” as provided for in the Warrant Agreement)
of the United States of America upon surrender of this Warrant Certificate and payment of the Warrant Price at the office or agency of
the Warrant Agent referred to below, subject to the conditions set forth herein and in the Warrant Agreement. Defined terms used in this
Warrant Certificate but not defined herein shall have the meanings given to them in the Warrant Agreement.


 


Each
whole Warrant is initially exercisable for one fully paid and non-assessable Class A Ordinary Share. No fractional shares will be issued
upon exercise of any Warrant. If, upon the exercise of Warrants, a holder would be entitled to receive a fractional interest in a Class
A Ordinary Share, the Company will, upon exercise, round down to the nearest whole number the number of Ordinary Shares to be issued
to the Warrant holder. The number of Ordinary Shares issuable upon exercise of the Warrants is subject to adjustment upon the occurrence
of certain events as set forth in the Warrant Agreement.


 


The
initial Warrant Price per Class A Ordinary Share for any Warrant is equal to $11.50 per share. The Warrant Price is subject to adjustment
upon the occurrence of certain events as set forth in the Warrant Agreement.


 


Subject
to the conditions set forth in the Warrant Agreement, the Warrants may be exercised only during the Exercise Period and to the extent
not exercised by the end of such Exercise Period, such Warrants shall become void. The Warrants may be redeemed, subject to certain conditions,
as set forth in the Warrant Agreement.


 


Reference
is hereby made to the further provisions of this Warrant Certificate set forth on the reverse hereof and such further provisions shall
for all purposes have the same effect as though fully set forth at this place.


 


This
Warrant Certificate shall not be valid unless countersigned by the Warrant Agent, as such term is used in the Warrant Agreement. This
Warrant Certificate shall be governed by and construed in accordance with the internal laws of the State of New York.


 






     

     


    

 


	 	TKB CRITICAL TECHNOLOGIES 1
	 	 
	 	By:	              
	 	Name:	 
	 	Title:	 
	 	 
	 	CONTINENTAL STOCK TRANSFER & TRUST
    COMPANY,
	 	as Warrant Agent
	 	 
	 	By:	 
	 	Name:	 
	 	Title:	 


 


 


 


[Signature
Page to Warrant Certificate]


 




     

     


    

 


[Form
of Warrant Certificate]


 


[Reverse]


 


The
Warrants evidenced by this Warrant Certificate are part of a duly authorized issue of Warrants entitling the holder on exercise to receive
Class A Ordinary Shares and are issued or to be issued pursuant to a Warrant Agreement dated as of ______ , 2021 (the “Warrant
Agreement”), duly executed and delivered by the Company to Continental Stock Transfer & Trust Company, a New York limited
purpose trust company, as warrant agent (the “Warrant Agent”), which Warrant Agreement is hereby incorporated
by reference in and made a part of this instrument and is hereby referred to for a description of the rights, limitation of rights, obligations,
duties and immunities thereunder of the Warrant Agent, the Company and the holders (the words “holders” or
“holder” meaning the Registered Holders or Registered Holder, respectively) of the Warrants. A copy of the
Warrant Agreement may be obtained by the holder hereof upon written request to the Company. Defined terms used in this Warrant Certificate
but not defined herein shall have the meanings given to them in the Warrant Agreement.


 


Warrants
may be exercised at any time during the Exercise Period set forth in the Warrant Agreement. The holder of Warrants evidenced by this
Warrant Certificate may exercise them by surrendering this Warrant Certificate, with the form of Election to Purchase set forth hereon
properly completed and executed, together with payment of the Warrant Price as specified in the Warrant Agreement (or through “cashless
exercise” as provided for in the Warrant Agreement) at the principal corporate trust office of the Warrant Agent. In the event
that upon any exercise of Warrants evidenced hereby the number of Warrants exercised shall be less than the total number of Warrants
evidenced hereby, there shall be issued to the holder hereof or his, her or its assignee, a new Warrant Certificate evidencing the number
of Warrants not exercised.


 


Notwithstanding
anything else in this Warrant Certificate or the Warrant Agreement, no Warrant may be exercised unless at the time of exercise (i) a
registration statement covering the issuance of Class A Ordinary Shares to be issued upon exercise is effective under the Securities
Act and (ii) a prospectus thereunder relating to the Ordinary Shares is current, except through “cashless exercise” as provided
for in the Warrant Agreement.


 


The
Warrant Agreement provides that upon the occurrence of certain events the number of Class A Ordinary Shares issuable upon exercise of
the Warrants set forth on the face hereof may, subject to certain conditions, be adjusted. If, upon exercise of a Warrant, the holder
thereof would be entitled to receive a fractional interest in a Class A Ordinary Shares, the Company shall, upon exercise, round down
to the nearest whole number of Class A Ordinary Shares to be issued to the holder of the Warrant.


 


Warrant
Certificates, when surrendered at the principal corporate trust office of the Warrant Agent by the Registered Holder thereof in person
or by legal representative or attorney duly authorized in writing, may be exchanged, in the manner and subject to the limitations provided
in the Warrant Agreement, but without payment of any service charge, for another Warrant Certificate or Warrant Certificates of like
tenor evidencing in the aggregate a like number of Warrants.


 


Upon
due presentation for registration of transfer of this Warrant Certificate at the office of the Warrant Agent a new Warrant Certificate
or Warrant Certificates of like tenor and evidencing in the aggregate a like number of Warrants shall be issued to the transferee(s)
in exchange for this Warrant Certificate, subject to the limitations provided in the Warrant Agreement, without charge except for any
tax or other governmental charge imposed in connection therewith.


 


The
Company and the Warrant Agent may deem and treat the Registered Holder(s) hereof as the absolute owner(s) of this Warrant Certificate
(notwithstanding any notation of ownership or other writing hereon made by anyone), for the purpose of any exercise hereof, of any distribution
to the holder(s) hereof, and for all other purposes, and neither the Company nor the Warrant Agent shall be affected by any notice to
the contrary. Neither the Warrants nor this Warrant Certificate entitles any holder hereof to any rights of a shareholder of the Company.


 






     

     


    

 


Election
to Purchase


 


(To
Be Executed Upon Exercise of Warrant)


 


The
undersigned hereby irrevocably elects to exercise the right, represented by this Warrant Certificate, to receive Class A Ordinary
Shares and herewith tenders payment for such Class A Ordinary Shares to the order of TKB Critical Technologies 1 (the
“Company”) in the amount of $______ in accordance with the terms hereof. The undersigned requests that a
certificate for such Ordinary Shares be registered in the name of _______________ , whose address is ______ and that
such Class A Ordinary Shares be delivered to ______ , whose address is __________________.


 


If
said number of Class A Ordinary Shares is less than all of the Class A Ordinary Shares purchasable hereunder, the undersigned requests
that a new Warrant Certificate representing the remaining balance of such Class A Ordinary Shares be registered in the name of ______________,
whose address is _____________ and that such Warrant Certificate be delivered to ____________, whose address is _____________.


 


In
the event that the Warrant has been called for redemption by the Company pursuant to Section 6.2 of the Warrant Agreement and
a holder thereof elects to exercise its Warrant pursuant to a Make-Whole Exercise, the number of Class A Ordinary Shares that this Warrant
is exercisable for shall be determined in accordance with subsection 3.3.1(c) or Section 6.2 of the Warrant Agreement,
as applicable.


 


In
the event that the Warrant is a Private Placement Warrant that is to be exercised on a “cashless basis”
pursuant to subsection 3.3.1(c) of the Warrant Agreement, the number of Class A Ordinary Shares that this Warrant is exercisable
for shall be determined in accordance with subsection 3.3.1(c) of the Warrant Agreement.


 


In
the event that the Warrant is to be exercised on a “cashless basis” pursuant to Section 7.4 of the Warrant Agreement,
the number of Class A Ordinary Shares that this Warrant is exercisable for shall be determined in accordance with Section 7.4
of the Warrant Agreement.


 


In
the event that the Warrant may be exercised, to the extent allowed by the Warrant Agreement, through cashless exercise (i) the number
Class A Ordinary Shares that this Warrant is exercisable for would be determined in accordance with the relevant section of the Warrant
Agreement which allows for such cashless exercise and (ii) the holder hereof shall complete the following: The undersigned hereby irrevocably
elects to exercise the right, represented by this Warrant Certificate, through the cashless exercise provisions of the Warrant Agreement,
to receive Class A Ordinary Shares. If said number of shares is less than all of the Class A Ordinary Shares purchasable hereunder (after
giving effect to the cashless exercise), the undersigned requests that a new Warrant Certificate representing the remaining balance of
such Ordinary Shares be registered in the name of _____________ , whose address is, whose address is ____________, and that such Warrant
Certificate be delivered to ____.


 


 


[Signature
Page Follows]


 




     

     


    

 


	Date: ____________,
    20___	 
	 	Signature
	 	 
	 	 
	 	 
	 	 
	 	(Address)
	 	 
	 	 
	 	(Tax Identification Number)
	Signature Guaranteed:	 
	 	 
	 	 


 


THE
SIGNATURE(S) SHOULD 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 UNDER THE SECURITIES EXCHANGE
ACT OF 1934, AS AMENDED (OR ANY SUCCESSOR RULE)).