Document:

Exhibit
4.3

 

	NUMBER

        ________-
	 	(SEE
                                         REVERSE SIDE FOR LEGEND)

        THIS
        WARRANT WILL BE VOID IF NOT EXERCISED PRIOR TO THE EXPIRATION DATE (DEFINED BELOW) 
	 	WARRANTS

 

PETRA
ACQUISITION, INC.

 

CUSIP
716421 110

 

WARRANT

 

THIS
CERTIFIES THAT, for value received

 

is
the registered holder of a warrant or warrants (the “Warrant(s)”) of Petra Acquisition, Inc., a Delaware corporation
(the “Company”), expiring at 5:00 p.m., New York City time, on the five year anniversary of the Company’s
completion of an initial merger, share exchange, asset acquisition, stock purchase, recapitalization, reorganization or other
similar business combination with one or more businesses or entities (a “Business Combination”), to purchase
one fully paid and non-assessable share of common stock, par value $0.001 per share (“Shares”), of the Company
for each whole Warrant evidenced by this Warrant Certificate. The Warrant entitles the holder thereof to purchase from the Company,
commencing on the later of (a) _______, 2020 and (b) 30 days after the Company’s completion of an initial Business Combination,
such number of Shares of the Company at the Warrant Price (as defined below), upon surrender of this Warrant Certificate and payment
of the Warrant Price at the office or agency of Continental Stock Transfer & Trust Company (the “Warrant Agent”),
but only subject to the conditions set forth herein and in the Warrant Agreement between the Company and Continental Stock Transfer
& Trust Company. In no event will the Company be required to net cash settle any warrant exercise. The Warrant Agreement provides
that upon the occurrence of certain events the Warrant Price, Redemption Trigger Price (defined below) and the number of Shares
purchasable hereunder, set forth on the face hereof, may, subject to certain conditions, be adjusted. The term “Warrant
Price” as used in this Warrant Certificate refers to the price per Share at which Shares may be purchased at the time
the Warrant is exercised. The initial Warrant Price per Share is equal to $11.50 per share.

 

No
fraction of a Share will be issued upon any exercise of a Warrant. If the holder of a Warrant would be entitled to receive a fraction
of a Share upon any exercise of a Warrant, the Company shall, upon such exercise, round up to the nearest whole number the number
of Shares to be issued to such holder.

 

Upon
any exercise of the Warrant for less than the total number of full Shares provided for herein, there shall be issued to the registered
holder hereof or the registered holder’s assignee a new Warrant Certificate covering the number of Shares for which the
Warrant has not been exercised.

 

Warrant
Certificates, when surrendered at the office or agency of the Warrant Agent by the registered holder in person or by 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 and evidencing in
the aggregate a like number of Warrants.

 

Upon
due presentment for registration of transfer of the Warrant Certificate at the office or agency 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 in exchange for this Warrant Certificate, subject to the limitations provided in the Warrant Agreement, without
charge except for any applicable tax or other governmental charge.

 

The
Company and the Warrant Agent may deem and treat the registered holder as the absolute owner 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 registered holder, and for all other purposes, and neither the Company nor the Warrant Agent shall be affected by any notice
to the contrary.

 

This
Warrant does not entitle the registered holder to any of the rights of a stockholder of the Company.

 

The
Company reserves the right to call the Warrant at any time prior to its exercise with a notice of call in writing to the holders
of record of the Warrant, giving at least 30 days’ notice of such call, at any time while the Warrant is exercisable, if
the last sale price of the Shares has been at least $16.50 per share (“Redemption Trigger Price”) on each of
20 trading days within any 30 trading day period (the “30-day trading period”) ending on the third business
day prior to the date on which notice of such call is given and if, and only if, there is a current registration statement in
effect with respect to the Shares underlying the Warrants commencing five business days prior to the 30-day trading period and
continuing each day thereafter until the date of redemption. The call price of the Warrants is to be $0.01 per Warrant. Any Warrant
either not exercised or tendered back to the Company by the end of the date specified in the notice of call shall be canceled
on the books of the Company and have no further value except for the $0.01 call price.

 

By

 

	 	 	 
	President	 	Secretary

 

    

     

    

  

SUBSCRIPTION
FORM

To
Be Executed by the Registered Holder in Order to Exercise Warrants

 

The
undersigned Registered Holder irrevocably elects to exercise ______________ Warrants represented by this Warrant Certificate,
and to purchase the Common Stock issuable upon the exercise of such Warrants, and requests that Certificates for such shares shall
be issued in the name of

 

	(PLEASE
    TYPE OR PRINT NAME AND ADDRESS)
	 
	 

(SOCIAL
SECURITY OR TAX IDENTIFICATION NUMBER)

and
be delivered to _______________________________________________________________________

(PLEASE
PRINT OR TYPE NAME AND ADDRESS)

 

and,
if such number of Warrants shall not be all the Warrants evidenced by this Warrant Certificate, that a new Warrant Certificate
for the balance of such Warrants be registered in the name of, and delivered to, the Registered Holder at the address stated below:

 

	Dated:
    	 	 	 	 
	 	 	 	 	(SIGNATURE)
	 	 	 	 	 
	 	 	 	 	(ADDRESS)
	 	 	 	 	 
	 	 	 	 	 
	 	 	 	 	(TAX
    IDENTIFICATION NUMBER)

 

ASSIGNMENT

To
Be Executed by the Registered Holder in Order to Assign Warrants

 

For
Value Received, _______________________ hereby sell, assign, and transfer unto

 

	(PLEASE
    TYPE OR PRINT NAME AND ADDRESS)
	 
	 

(SOCIAL
SECURITY OR TAX IDENTIFICATION NUMBER)

and
be delivered to _______________________________________________________________________

(PLEASE
PRINT OR TYPE NAME AND ADDRESS)

 

______________________
of the Warrants represented by this Warrant Certificate, and hereby irrevocably constitute and appoint _________________________________
Attorney to transfer this Warrant Certificate on the books of the Company, with full power of substitution in the premises.

 

	Dated:
    	 	 	 	 
	 	 	 	 	(SIGNATURE)

 

The
signature to the assignment of the Subscription Form must correspond to the name written upon the face of this Warrant Certificate
in every particular, without alteration or enlargement or any change whatsoever, and must be guaranteed by a commercial bank or
trust company or a member firm of the NYSE American, Nasdaq, New York Stock Exchange, Pacific Stock Exchange, or Chicago
Stock Exchange.Exhibit 10.3

 

PROMISSORY
NOTE

(this “Note”)  

 

	Borrower:
    	Petrai
    Acquisition Inc. of 5 West 21st Street New York, NY 10010 (the “Borrower”)
	 	 
	Lender:	Petra
    Investment Holdings LLC of 5 West 21st Street New York, NY 10010  (the “Lender”)

 

Principal
Amount:      $150,000.00 USD

 

		1.	FOR
VALUE RECEIVED, The Borrower promises to pay to the Lender at such address as may be provided in writing to the Borrower, the
principal sum of $150,000.00 USD, without interest payable on the unpaid principal.

 

		2.	This
Note is repayable within 15 day(s) of the Lender providing the Borrower with written notice of demand or December 31, 2021 whichever
comes first.

 

		3.	The
Borrower shall be liable for all costs, expenses and expenditures incurred including, without limitation, the complete legal costs
of the Lender incurred by enforcing this Note as a result of any default by the Borrower and such costs will be added to the principal
then outstanding and shall be due and payable by the Borrower to the Lender immediately upon demand of the Lender.

 

		4.	If
any term, covenant, condition or provision of this Note is held by a court of competent jurisdiction to be invalid, void or unenforceable,
it is the parties’ intent that such provision be reduced in scope by the court only to the extent deemed necessary by that
court to render the provision reasonable and enforceable and the remainder of the provisions of this Note will in no way be affected,
impaired or invalidated as a result.

 

		5.	This
Note will be construed in accordance with and governed by the laws of the State of New York.

 

		6.	This
Note will enure to the benefit of and be binding upon the respective heirs, executors, administrators, successors and assigns
of the Borrower and the Lender. The Borrower waives presentment for payment, notice of non-payment, protest and notice of protest.

 

    

     

    

 

IN
WITNESS WHEREOF the parties have duly affixed their signatures under seal

  

	SIGNED,
    SEALED, AND DELIVERED	 
	this
    4th day of June, 2020.	Petra
    Acquisition Inc.
	 	 
	 	Per:
    /s/ Andreas Typaldos
	 	Andreas
    Typaldos

  

	SIGNED,
    SEALED, AND DELIVERED	 
	this
    4th day of June, 2020.	Petra
    Investments Holdings LLC
	 	 
	 	Per:
    /s/ Andreas Typaldos
	 	Andreas
    Typaldos, as Manager/MemberExhibit 10.5

 

FORM OF SUBSCRIPTION AGREEMENT FOR PRIVATE
WARRANTS 

_______ __, 2020

 

Gentlemen:

 

Petra Acquisition, Inc. (the
“Corporation”), a blank check company formed for the purpose of acquiring one or more businesses or entities (a “Business
Combination”), intends to register its securities under the Securities Act of 1933, as amended (“Securities Act”),
in connection with its initial public offering (“IPO”). The Corporation currently anticipates selling units in the
IPO, each comprised of one share of common stock, par value $0.001 per share, of the Corporation (“Common Stock”) and
one-half of one warrant to purchase one share of Common Stock (“Warrant”).

 

The undersigned hereby
commits to purchase from the Corporation an aggregate of 4,500,000 warrants of the Corporation (the “Initial Warrants”)
at a price of $0.50 per Initial Private Warrant, for an aggregate purchase price of $2,250,000 (the “Initial Purchase Price”).
Additionally, if the underwriters in the IPO exercise their over-allotment option in full or part, the undersigned further commits
to purchase up to an additional 375,000 Warrants (“Additional Warrants” and together with the Initial Warrants, the
“Private Warrants”), for an aggregate purchase price of up to $187,500 (the “Over-Allotment Purchase Price”
and together with the Initial Purchase Price, the “Purchase Price”). The Private Warrants will be identical to the
warrants to be sold in the IPO except as to be described in the Corporation’s registration statement filed in connection
with the IPO (“Registration Statement”). At least 24 hours prior to the effective date (“Effective Date”)
of the Registration Statement, the undersigned will cause the Purchase Price to be delivered to Horwitz + Armstrong, A Professional
Law Corporation, counsel for the Corporation (“Counsel”), by wire transfer as set forth in the instructions attached
as Exhibit A hereto to hold in a non-interest bearing account until the Corporation consummates the IPO. The undersigned
agrees that if the size of the IPO is increased or decreased for any reason, the amount of the undersigned’s investment will
be either increased or decreased, as applicable, so that the undersigned’s percentage of the aggregate investment in Private
Warrants (made by the undersigned and other investors of the Company remains the same. If the size of the offering is increased,
the undersigned agrees that it will deliver the purchase price for such additional Private Warrants to Counsel as set forth above
or as promptly as is reasonably practicable following the increase if it is on the Effective Date. If the size of the offering
is decreased, the unused portion of the Purchase Price shall be returned to the undersigned.

 

The consummation of the
purchase and issuance of the Private Warrants shall occur simultaneously with the consummation of the IPO and over-allotment option,
respectively. Simultaneously with the consummation of the IPO, Counsel shall deposit the Purchase Price, without interest or deduction,
into the trust fund (“Trust Fund”) established by the Corporation for the benefit of the Corporation’s public
stockholders as described in the Registration Statement. Simultaneously with the consummation of all or any part of the over-allotment
option, Counsel shall deposit the pro-rata portion of the Over-Allotment Purchase Price, based upon the amount of the over-allotment
option that has been exercised, without interest or deduction, into the Trust Fund. Upon expiration of the over-allotment option,
Counsel shall return any unused portion of the Over-Allotment Purchase Price to the undersigned. If the Corporation does not complete
the IPO within thirty (30) days from the Effective Date, the Purchase Price (without interest or deduction) will be returned to
the undersigned.

 

Each of the Corporation
and the undersigned acknowledges and agrees that Counsel is serving hereunder solely as a convenience to the parties to facilitate
the purchase of the Private Warrants and Counsel’s sole obligation under this letter agreement is to act with respect to
holding and disbursing the Purchase Price for the Private Warrants as described above. Counsel shall not be liable to the Corporation
or the undersigned or any other person or entity in respect of any act or failure to act hereunder or otherwise in connection with
performing its services hereunder unless Counsel has acted in a manner constituting gross negligence or willful misconduct. The
Corporation shall indemnify Counsel against any claim made against it (including reasonable attorney’s fees) by reason of
it acting or failing to act in connection with this letter agreement except as a result of its gross negligence or willful misconduct.
Counsel may rely and shall be protected in acting or refraining from acting upon any written notice, instruction or request furnished
to it hereunder and believed by it to be genuine and to have been signed or presented by the proper party or parties. 

 

     

     

    

 

The Private Warrants
will be identical to the units and warrants to be sold by the Corporation in the IPO, except that:

 

	 	●	the Private Warrants (i) will not be redeemable by the Corporation and (ii) may be exercised for cash or on a cashless basis, as described in the Registration Statement, in each case so long as they are held by the undersigned or any of its permitted transferees;

 

	 	●	the Private Warrants and underlying securities will not be transferable by the undersigned until the consummation of a Business Combination (subject to certain exceptions as described in the Registration Statement);

 

	 	●	the undersigned will not participate in any liquidation distribution with respect to the Private Warrants or the underlying securities (but will participate in liquidation distributions with respect to any units or shares of Common Stock purchased by the undersigned in the IPO or in the open market after the IPO) if the Corporation fails to consummate a Business Combination; 
	 	 	 
	 	●	the Private Warrants will be subject to customary registration rights, pursuant to a registration rights agreement on terms agreed upon by the Company and the Underwriters to be filed as an exhibit to the Registration Statement; and

 

	 	●	the Private Warrants and the underlying securities will include any additional terms or restrictions as is customary in other similarly structured blank check company offerings or as may be reasonably required by the underwriters in the IPO in order to consummate the IPO, each of which will be set forth in the Registration Statement.

 

The undersigned acknowledges
and agrees that it will execute agreements in form and substance typical for transactions of this nature necessary to effectuate
the foregoing agreements and obligations prior to the consummation of the IPO as are reasonably acceptable to the undersigned,
including but not limited to (i) an insider letter, (ii) an escrow agreement and (iii) a registration rights agreement.

 

The undersigned hereby
represents and warrants that, as applicable:

 

	 	(a)	it has been advised that the Private Warrants and the underlying securities have not been registered under the Securities Act;

 

	 	(b)	it is acquiring the Private Warrants and the underlying securities for its account for investment purposes only;

 

	 	(c)	it has no present intention of selling or otherwise disposing of the Private Warants or the underlying securities in violation of the securities laws of the United States;

 

	 	(d)	it is an “accredited investor” as defined by Rule 501 of Regulation D promulgated under the Securities Act of 1933, as amended;

 

	 	(e)	it has had both the opportunity to ask questions and receive answers from the officers and directors of the Corporation and all persons acting on its behalf concerning the terms and conditions of the offer made hereunder;

 

	 	(f)	it is familiar with the proposed business, management, financial condition and affairs of the Corporation;

 

	 	(g)	it has full power, authority and legal capacity to execute and deliver this letter and any documents contemplated herein or needed to consummate the transactions contemplated in this letter; and

 

	 	(h)	this letter constitutes a legal, valid and binding obligation, and is enforceable against it.

 

[Signature Page Follows]

 

     

     

    

 

 

 

	 	Very truly yours,
	 	 	 
	 	PETRA INVESTMENT HOLDINGS, LLC
	 	 
	 	By:	 
	 	 	Name:
	 	 	Title:

 

	Accepted and Agreed:	 
	 	 	 
	Petra acquisition, inc.	 
	 	 	 
	By:	 	 
	 	Name:	 
	 	Title:	 
	 	 	 
	HORWITZ + ARMSTRONG	 
	(solely with respect to its obligations to hold
	and disburse monies for the Private Securities)	 
	 	 	 
	By:	 	 
	 	Name:	 
	 	Title:	 

 

     

     

    

 

 

 

Exhibit A

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