Document:

Exhibit
4.1

 

	NUMBER

        U-__________

         
	 	 	 	UNITS

 

	SEE
    REVERSE FOR

 CERTAIN DEFINITIONS	PETRA
    ACQUISITION, INC.	 

 

CUSIP
716421 201

 

UNITS
CONSISTING OF ONE SHARE OF COMMON STOCK AND

ONE
WARRANT

 

THIS
CERTIFIES THAT__________________________________________________________________

 

is
the owner of_________________________________________________________________Units.

 

Each
Unit (“Unit”) consists of one (1) share of common stock, par value $0.001 per share (“Common Stock”),
of Petra Acquisition, Inc., a Delaware corporation (the “Company”), and one warrant (“Warrant”).
Each Warrant entitles the holder to purchase one share of Common Stock for $11.50 per share (subject to adjustment). Each Warrant will become exercisable on the later of (i) 30 days after the Company’s
completion of an initial merger, capital stock exchange, asset acquisition, or other similar business combination with one or
more businesses or entities (a “Business Combination”) and (ii) 12 months from the closing of the Company’s
initial public offering (“IPO”), and will expire unless exercised before 5:00 p.m., New York City Time, on
the fifth anniversary of the completion of an initial Business Combination, or earlier upon redemption or liquidation. The
Common Stock and Warrant(s) comprising the Unit(s) represented by this certificate are not transferable separately until ninety
days following the effective date of the registration statement on Form S-1 filed with the Securities and Exchange Commission
(“SEC”) in connection with the Company’s IPO, unless LifeSci Capital LLC informs the Company of its decision
to allow earlier separate trading, except that in no event will the Common Stock and Warrants be separately tradeable until the
Company has filed a Current Report on Form 8-K with the SEC containing an audited balance sheet reflecting the Company’s
receipt of the gross proceeds of its IPO and issued a press release announcing when such separate trading will begin. The terms
of the Warrants are governed by a Warrant Agreement, dated as of ____, 2020, 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 Registrar of the Company.

Witness
the facsimile seal of the Company and the facsimile signatures of its duly authorized officers.

 

By

  

	 	[Seal] 	 
	Chairman	Secretary

 

    

     

    

 

Petra
Acquisition, Inc.

 

The
Company will furnish without charge to each shareholder 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	under
    Uniform Gifts to Minors
	 	 	and
    not as tenants in common	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 will 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) 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).	 

 

The
holder(s) of this certificate shall be entitled to receive a pro-rata portion of the funds from the trust account with respect
to the common stock underlying this certificate only in the event that (i) the Company is forced to liquidate because it does
not consummate an initial business combination within the period of time set forth in the Company’s Amended and Restated
Certificate of Incorporation, as the same may be amended from time to time (the “Charter”) or (ii) if the holder seeks
to convert his shares upon consummation of, or sell his shares in a tender offer in connection with, an initial business combination
or in connection with certain amendments to the Charter. In no other circumstances shall the holder(s) have any right or interest
of any kind in or to the trust account.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 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 $18.00 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.

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