Document:

Exhibit 4.2

 

NUMBER

	 	NUMBER
	 	C
	 	SHARES
	 	SEE REVERSE FOR
	 	CERTAIN
	 	DEFINITIONS
	 	CUSIP

 

FIRSTMARK HORIZON ACQUISITION CORP.

 

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 CLASS A COMMON STOCK
OF THE PAR VALUE OF $0.0001 EACH OF

 

FIRSTMARK HORIZON ACQUISITION CORP.

(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 is unable to complete a business combination by    , 2022, or by such later date approved by the Company’s
stockholders in accordance with the Company’s amended and restated certificate of incorporation, 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.

 

 

	Secretary	[Corporate Seal]

Delaware	Principal Executive Officer

 

FIRSTMARK HORIZON ACQUISITION CORP.

 

The Company will furnish without charge to each stockholder
who so requests 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 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 ______

        (Cust)                      (Minor)

        Under Uniform Gifts to Minors Act _____________

        (State)

	TEN ENT	—	as tenants by the entireties	 	 	 
	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 sell(s), assign(s)
and transfer(s) 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 capital stock represented by the within Certificate,
and do(es) 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).

 

    2

     

    

 

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 the Company’s initial public offering only in the event that (i)
the Company redeems the shares of Class A Common Stock sold in its initial public offering and liquidates because it does not consummate
an initial business combination by                           , 2022, or by such later date approved by the Company’s stockholders in accordance with
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 redemption in connection with
the Company’s initial business combination or to redeem 100% of the shares of Class A Common Stock sold in its initial public
offering if it does not complete its initial business combination by                          , 2022, or (B) with respect to any other provision relating
to the holder(s) rights or pre-initial business combination activity, or (iii) if the holder(s) seek(s) to redeem for cash his,
her, its or their 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.

 

 

3Exhibit 4.4

 

WARRANT AGREEMENT

 

FIRSTMARK HORIZON ACQUISITION CORP.

and

CONTINENTAL STOCK TRANSFER & TRUST COMPANY

 

Dated [•], 2020

 

THIS WARRANT AGREEMENT (this “Agreement”),
dated [•], 2020, is by and between FirstMark Horizon Acquisition Corp., a Delaware corporation (the “Company”),
and Continental Stock Transfer & Trust Company, a New York corporation, as warrant agent (in such capacity, the “Warrant
Agent”).

 

WHEREAS, it is proposed that the Company
enter into that certain Private Placement Warrants Purchase Agreement, with FirstMark Horizon Sponsor LLC, a Delaware limited liability
company (the “Sponsor”), pursuant to which the Sponsor will purchase an aggregate of 5,333,333 warrants
(or up to 5,933,333 warrants if the underwriters in the Offering (defined below) exercise their Over-allotment Option (as defined
below) in full) simultaneously with the closing of the Offering (and the closing of the Over-allotment Option, if applicable),
bearing the legend set forth in Exhibit B hereto (the “Private Placement Warrants”) at a purchase
price of $1.50 per Private Placement Warrant. Each Private Placement Warrant entitles the holder thereof to purchase one shares
of Common Stock (as defined below) at a price of $11.50 per share, subject to adjustment as described herein; and

 

WHEREAS, in order to finance the Company’s
transaction costs in connection with an intended initial merger, capital stock exchange, asset acquisition, stock purchase, reorganization
or similar business combination, involving the Company and one or more businesses (a “Business Combination”),
the Sponsor or an affiliate of the Sponsor or certain of the Company’s officers and directors may, but are not obligated
to, loan the Company funds as the Company may require, of which up to $1,500,000 of such loans may be convertible into up to an
additional 1,000,000 Private Placement Warrants at a price of $1.50 per Private Placement Warrant; and

 

WHEREAS, the Company is engaged in an initial
public offering (the “Offering”) of units of the Company’s equity securities, each such unit comprised
of one shares of Common Stock and one-third of one Public Warrant (as defined below) (the “Units”) and,
in connection therewith, has determined to issue and deliver up to 11,500,000 redeemable warrants (including up to 1,500,000 redeemable
warrants subject to the Over-allotment Option) to public investors in the Offering (the “Public Warrants”
and, together with the Private Placement Warrants, the “Warrants”). Each whole Warrant entitles the holder
thereof to purchase one share of Class A common stock of the Company, par value $0.0001 per share (“Common Stock”),
for $11.50 per share, subject to adjustment as described herein. Only whole Warrants are exercisable. A holder of the Public Warrants
will not be able to exercise any fraction of a Warrant; and

 

    	 	 	 

    	 	 

    

 

WHEREAS, the Company has filed with the
Securities and Exchange Commission (the “Commission”) a registration statement on Form S-1, No. 333-[•],
and a prospectus (the “Prospectus”), for the registration, under the Securities Act of 1933, as amended
(the “Securities Act”), of the Units, the Public Warrants and the Common Stock included in the Units;
and

 

WHEREAS, the Company desires the Warrant
Agent to act on behalf of the Company, and the Warrant Agent is willing to so act, in connection with the issuance, registration,
transfer, exchange, redemption and exercise of the Warrants; and

 

WHEREAS, the Company desires to provide
for the form and provisions of the Warrants, the terms upon which they shall be issued and exercised, and the respective rights,
limitation of rights, and immunities of the Company, the Warrant Agent and the holders of the Warrants; and

 

WHEREAS, all acts and things have been done
and performed which are necessary to make the Warrants, when executed on behalf of the Company and countersigned by or on behalf
of the Warrant Agent (if a physical certificate is issued), as provided herein, the valid, binding and legal obligations of the
Company, and to authorize the execution and delivery of this Agreement.

 

NOW, THEREFORE, in consideration of the mutual agreements herein
contained, the parties hereto agree as follows:

 

1. Appointment
of Warrant Agent. The Company hereby appoints the Warrant Agent to act as agent for the Company for the Warrants, and the Warrant
Agent hereby accepts such appointment and agrees to perform the same in accordance with the terms and conditions set forth in this
Agreement.

 

2. Warrants.

 

2.1 Form
of Warrant. Each Warrant shall initially be issued in registered form only.

 

2.2 Effect
of Countersignature. If a physical certificate is issued, unless and until countersigned by the Warrant Agent pursuant to this
Agreement, a certificated Warrant shall be invalid and of no effect and may not be exercised by the holder thereof.

 

2.3 Registration.

 

2.3.1 Warrant
Register. The Warrant Agent shall maintain books (the “Warrant Register”), for the registration of
original issuance and the registration of transfer of the Warrants. Upon the initial issuance of the Warrants in book-entry form,
the Warrant Agent shall issue and register the Warrants in the names of the respective holders thereof in such denominations and
otherwise in accordance with instructions delivered to the Warrant Agent by the Company. Ownership of beneficial interests in the
Public Warrants shall be shown on, and the transfer of such ownership shall be effected through, records maintained by institutions
that have accounts with The Depository Trust Company (the “Depositary”) (such institution, with respect
to a Warrant in its account, a “Participant”).

 

    	 	2	 

    	 	 

    

 

If the Depositary subsequently ceases to
make its book-entry settlement system available for the Public Warrants, the Company may instruct the Warrant Agent regarding making
other arrangements for book-entry settlement. In the event that the Public Warrants are not eligible for, or it is no longer necessary
to have the Public Warrants available in, book-entry form, the Warrant Agent shall provide written instructions to the Depositary
to deliver to the Warrant Agent for cancellation each book-entry Public Warrant, and the Company shall instruct the Warrant Agent
to deliver to the Depositary definitive certificates in physical form evidencing such Warrants (“Definitive Warrant
Certificates”) which shall be in the form annexed hereto as Exhibit A.

 

Physical certificates, if issued, shall
be signed by, or bear the facsimile signature of, the Chairman of the Board, Chief Executive Officer, President, Chief Financial
Officer, Secretary or other principal officer of the Company. In the event the person whose facsimile signature has been placed
upon any Warrant shall have ceased to serve in the capacity in which such person signed the Warrant before such Warrant is issued,
it may be issued with the same effect as if he or she had not ceased to be such at the date of issuance.

 

2.3.2 Registered
Holder. Prior to due presentment for registration of transfer of any Warrant, the Company and the Warrant Agent may deem and
treat the person in whose name such Warrant is registered in the Warrant Register (the “Registered Holder”)
as the absolute owner of such Warrant and of each Warrant represented thereby, for the purpose of any exercise thereof, and for
all other purposes, and neither the Company nor the Warrant Agent shall be affected by any notice to the contrary.

 

2.4 Detachability
of Warrants. The shares of Common Stock and Public Warrants comprising the Units shall begin separate trading on the 52nd day
following the date of the Prospectus or, if such 52nd day is not on a day, other than a Saturday, Sunday or federal holiday, on
which banks in New York City are generally open for normal business (a “Business Day”), then on the immediately
succeeding Business Day following such date, or earlier (the “Detachment Date”) with the consent of Credit
Suisse Securities (USA) LLC, but in no event shall the shares of Common Stock and the Public Warrants comprising the Units be separately
traded until (A) the Company has filed a Current Report on Form 8-K with the Commission containing an audited balance sheet reflecting
the receipt by the Company of the gross proceeds of the Offering, including the proceeds then received by the Company from the
exercise by the underwriters of their right to purchase additional Units in the Offering (the “Over-allotment Option”),
if the Over-allotment Option is exercised prior to the filing of the Current Report on Form 8-K, and (B) the Company issues a press
release announcing when such separate trading shall begin.

 

2.5 Fractional
Warrants. The Company shall not issue fractional Warrants other than as part of the Units, each of which is comprised of one
shares of Common Stock and one-third of one whole Public Warrant. If, upon the detachment of Public Warrants from the Units or
otherwise, a holder of Warrants would be entitled to receive a fractional Warrant, the Company shall round down to the nearest
whole number the number of Warrants to be issued to such holder.

 

    	 	3	 

    	 	 

    

 

2.6 Private
Placement Warrants. The Private Placement Warrants shall be identical to the Public Warrants, except that so long as they are
held by the Sponsor or any of its Permitted Transferees (as defined below) the Private Placement Warrants: (i) may be exercised
for cash or on a “cashless basis,” pursuant to subsection 3.3.1(c) hereof, (ii) including the shares of Common
Stock issuable upon exercise of the Private Placement Warrants, may not be transferred, assigned or sold until thirty (30) days
after the completion by the Company of an initial Business Combination, (iii) shall not be redeemable by the Company pursuant to
Section 6.1 hereof and (iv) shall only be redeemable by the Company pursuant to Section 6.2 if the Reference
Value (as defined below) is less than $18.00 per share (subject to adjustment in compliance with Section 4 hereof); provided,
however, that in the case of (ii), the Private Placement Warrants and any shares of Common Stock issued upon exercise of
the Private Placement Warrants may be transferred by the holders thereof:

 

(a) to
the Company’s directors or officers, any affiliates or family members of any of the Company’s directors or officers,
any members of the Sponsor or any affiliates of the Sponsor;

 

(b) in
the case of an individual, by gift to a member of the individual’s immediate family, or to a trust, the beneficiary of which
is a member of the individual’s immediate family or an affiliate of such person, or to a charitable organization;

 

(c) in
the case of an individual, by virtue of laws of descent and distribution upon death of the individual;

 

(d) in
the case of an individual, pursuant to a qualified domestic relations order;

 

(e) by
private sales or transfers made in connection with the consummation of the Company’s Business Combination at prices no greater
than the price at which the securities were originally purchased;

 

(f) in
the event of the Company’s liquidation prior to the Company’s completion of its initial Business Combination;

 

(g) by
virtue of the laws of Delaware or the Sponsor’s limited liability company agreement, as amended, upon dissolution of the
Sponsor; and

 

(h) in
the event of the Company’s completion of a liquidation, merger, stock exchange, reorganization or other similar transaction
which results in all of the Company’s stockholders having the right to exchange their shares of Common Stock for cash, securities
or other property subsequent to the completion of the Company’s initial Business Combination;

 

provided, however, that, in
the case of clauses (a) through (e), these permitted transferees (the “Permitted Transferees”) must enter
into a written agreement with the Company agreeing to be bound by the transfer restrictions in this Agreement.

 

    	 	4	 

    	 	 

    

 

3. Terms
and Exercise of Warrants.

 

3.1 Warrant
Price. Each whole Warrant shall entitle the Registered Holder thereof, subject to the provisions of such Warrant and of this
Agreement, to purchase from the Company the number of shares of Common Stock stated therein, at the price of $11.50 per share,
subject to the adjustments provided in Section 4 hereof and in the last sentence of this Section 3.1. The term “Warrant
Price” as used in this Agreement shall mean the price per share (including in cash or by payment of Warrants pursuant
to a “cashless exercise,” to the extent permitted hereunder) described in the prior sentence at which shares of Common
Stock may be purchased at the time a Warrant is exercised. The Company in its sole discretion may lower the Warrant Price at any
time prior to the Expiration Date (as defined below) for a period of not less than twenty (20) Business Days (unless otherwise
required by the Commission, any national securities exchange on which the Warrants are listed or applicable law); provided
that the Company shall provide at least twenty (20) days prior written notice of such reduction to Registered Holders of the Warrants
and, provided further that any such reduction shall be identical among all of the Warrants.

 

3.2 Duration
of Warrants. A Warrant may be exercised only during the period (the “Exercise Period”) (A) commencing
on the later of: (i) the date that is thirty (30) days after the first date on which the Company completes a Business Combination,
and (ii) the date that is twelve (12) months from the date of the closing of the Offering, and (B) terminating at the earliest
to occur of (x) 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, (y) the liquidation of the Company in accordance with the Company’s amended and restated
certificate of incorporation, as amended from time to time, if the Company fails to complete a Business Combination, and (z) other
than with respect to the Private Placement Warrants then held by the Sponsor or its Permitted Transferees with respect to a redemption
pursuant to Section 6.1 hereof or, if the Reference Value equals or exceeds $18.00 per share (subject to adjustment in compliance
with Section 4 hereof), Section 6.2 hereof, 5:00 p.m., New York City time on the Redemption Date (as defined below)
as provided in Section 6.4 hereof (the “Expiration Date”); provided, however, that
the exercise of any Warrant shall be subject to the satisfaction of any applicable conditions, as set forth in subsection 3.3.2
below, with respect to an effective registration statement or a valid exemption therefrom being available. Except with respect
to the right to receive the Redemption Price (as defined below) (other than with respect to a Private Placement Warrant then held
by the Sponsor or its Permitted Transferees in connection with a redemption pursuant to Section 6.1 hereof or, if the Reference
Value equals or exceeds $18.00 per share (subject to adjustment in compliance with Section 4 hereof), Section 6.2
hereof) in the event of a redemption (as set forth in Section 6 hereof), each Warrant (other than a Private Placement Warrant
then held by the Sponsor or its Permitted Transferees in the event of a redemption pursuant to Section 6.1 hereof or, if
the Reference Value equals or exceeds $18.00 per share (subject to adjustment in compliance with Section 4 hereof), Section
6.2 hereof) not exercised on or before the Expiration Date shall become void, and all rights thereunder and all rights in respect
thereof under this Agreement shall cease at 5:00 p.m. New York City time on the Expiration Date. The Company in its sole discretion
may extend the duration of the Warrants by delaying the Expiration Date; provided that the Company shall provide at least
twenty (20) days prior written notice of any such extension to Registered Holders of the Warrants and, provided further that any
such extension shall be identical in duration among all the Warrants.

 

    	 	5	 

    	 	 

    

 

3.3 Exercise
of Warrants.

 

3.3.1 Payment.
Subject to the provisions of the Warrant and this Agreement, a Warrant may be exercised by the Registered Holder thereof by delivering
to the Warrant Agent at its corporate trust department (i) the Definitive Warrant Certificate evidencing the Warrants to be
exercised, or, in the case of a Warrant represented by a book-entry, the Warrants to be exercised (the “Book-Entry
Warrants”) on the records of the Depositary to an account of the Warrant Agent at the Depositary designated
for such purposes in writing by the Warrant Agent to the Depositary from time to time, (ii) an election to purchase (“Election
to Purchase”) any shares of Common Stock pursuant to the exercise of a Warrant, properly completed and executed by
the Registered Holder on the reverse of the Definitive Warrant Certificate or, in the case of a Book-Entry Warrant, properly delivered
by the Participant in accordance with the Depositary’s procedures, and (iii) the payment in full of the Warrant Price for
each share of Common Stock as to which the Warrant is exercised and any and all applicable taxes due in connection with the exercise
of the Warrant, the exchange of the Warrant for the shares of Common Stock and the issuance of such shares of Common Stock, as
follows:

 

(a) in
lawful money of the United States, in good certified check or good bank draft payable to the order of the Warrant Agent;

 

(b) [Reserved];

 

(c) with
respect to any Private Placement Warrant, so long as such Private Placement Warrant is held by the Sponsor or a Permitted Transferee,
by surrendering the Warrants for that number of shares of Common Stock equal to (i) if in connection with a redemption of
Private Placement Warrants pursuant to Section 6.2 hereof, as provided in Section 6.2 hereof with respect to a Make-Whole
Exercise (as defined below) and (ii) in all other scenarios the quotient obtained by dividing (x) the product of the number
of shares of Common Stock underlying the Warrants, multiplied by the excess of the “Sponsor Exercise Fair Market Value”
(as defined in this subsection 3.3.1(c)) less the Warrant Price by (y) the Sponsor Exercise Fair Market Value. Solely for
purposes of this subsection 3.3.1(c), the “Sponsor Fair Market Value” shall mean the average last reported sale
price of the shares of Common Stock for the ten (10) trading days ending on the third (3rd) trading day prior to the
date on which notice of exercise of the Private Placement Warrant is sent to the Warrant Agent;

 

(d) as
provided in Section 6.2 hereof with respect to a Make-Whole Exercise; or

 

(e) as
provided in Section 7.4 hereof.

 

    	 	6	 

    	 	 

    

 

3.3.2 Issuance
of Shares of Common Stock on Exercise. As soon as practicable after the exercise of any Warrant and the clearance of the funds
in payment of the Warrant Price (if payment is pursuant to subsection 3.3.1(a)), the Company shall issue to the Registered
Holder of such Warrant a book-entry position or certificate, as applicable, for the number of shares of Common Stock to which he,
she or it is entitled, registered in such name or names as may be directed by him, her or it on the register of members of the
Company, and if such Warrant shall not have been exercised in full, a new book-entry position or countersigned Warrant, as applicable,
for the number of shares as to which such Warrant shall not have been exercised. Notwithstanding the foregoing, the Company shall
not be obligated to deliver any shares of Common Stock pursuant to the exercise of a Warrant and shall have no obligation to settle
such Warrant exercise unless a registration statement under the Securities Act with respect to the shares of Common Stock underlying
the Public Warrants is then effective and a prospectus relating thereto is current, subject to the Company’s satisfying its
obligations under Section 7.4 or a valid exemption from registration is available. No Warrant shall be exercisable and the
Company shall not be obligated to issue shares of Common Stock upon exercise of a Warrant unless the shares of Common Stock issuable
upon such Warrant exercise have been registered, qualified or deemed to be exempt from registration or qualification under the
securities laws of the state of residence of the Registered Holder of the Warrants. Subject to Section 4.6 of this Agreement,
a Registered Holder of Warrants may exercise its Warrants only for a whole number of shares of Common Stock. The Company may require
holders of Public Warrants to settle the Warrant on a “cashless basis” pursuant to Section 7.4. If, by reason
of any exercise of Warrants on a “cashless basis”, the holder of any Warrant would be entitled, upon the exercise of
such Warrant, to receive a fractional interest in a share of Common Stock, the Company shall round down to the nearest whole number,
the number of shares of Common Stock to be issued to such holder.

  

3.3.3 Valid
Issuance. All shares of Common Stock issued upon the proper exercise of a Warrant in conformity with this Agreement shall be
validly issued, fully paid and nonassessable.

 

3.3.4 Date
of Issuance. Each person in whose name any book-entry position or certificate, as applicable, for shares of Common Stock is
issued shall for all purposes be deemed to have become the holder of record of such shares of Common Stock on the date on which
the Warrant, or book-entry position representing such Warrant, was surrendered and payment of the Warrant Price was made, irrespective
of the date of delivery of such certificate in the case of a certificated Warrant, except that, if the date of such surrender and
payment is a date when the share transfer books of the Company or book-entry system of the Warrant Agent are closed, such person
shall be deemed to have become the holder of such shares of Common Stock at the close of business on the next succeeding date on
which the share transfer books or book-entry system are open.

 

    	 	7	 

    	 	 

    

 

3.3.5 Maximum
Percentage. A holder of a Warrant may notify the Company in writing in the event it elects to be subject to the provisions
contained in this subsection 3.3.5; however, no holder of a Warrant shall be subject to this subsection 3.3.5
unless he, she or it makes such election. If the election is made by a holder, the Warrant Agent shall not effect the exercise
of the holder’s Warrant, and such holder shall not have the right to exercise such Warrant, to the extent that after giving
effect to such exercise, such person (together with such person’s affiliates), to the Warrant Agent’s actual knowledge,
would beneficially own in excess of 9.8% or such other amount as a holder may specify (the “Maximum Percentage”)
of the shares of Common Stock outstanding immediately after giving effect to such exercise. For purposes of the foregoing sentence,
the aggregate number of shares of Common Stock beneficially owned by such person and its affiliates shall include the number of
shares of Common Stock issuable upon exercise of the Warrant with respect to which the determination of such sentence is being
made, but shall exclude shares of Common Stock that would be issuable upon (x) exercise of the remaining, unexercised portion of
the Warrant beneficially owned by such person and its affiliates and (y) exercise or conversion of the unexercised or unconverted
portion of any other securities of the Company beneficially owned by such person and its affiliates (including, without limitation,
any convertible notes or convertible preferred stock or warrants) subject to a limitation on conversion or exercise analogous to
the limitation contained herein. Except as set forth in the preceding sentence, for purposes of this paragraph, beneficial ownership
shall be calculated in accordance with Section 13(d) of the Securities Exchange Act of 1934, as amended (the “Exchange
Act”). For purposes of the Warrant, in determining the number of outstanding shares of Common Stock, the holder may
rely on the number of outstanding shares of Common Stock as reflected in (1) the Company’s most recent Annual Report on Form
10-K, Quarterly Report on Form 10-Q, Current Report on Form 8-K or other public filing with the Commission as the case may be,
(2) a more recent public announcement by the Company or (3) any other notice by the Company or Continental Stock Transfer &
Trust Company, as transfer agent (in such capacity, the “Transfer Agent”), setting forth the number of
shares of Common Stock outstanding. For any reason at any time, upon the written request of the holder of the Warrant, the Company
shall, within two (2) Business Days, confirm orally and in writing to such holder the number of shares of Common Stock then outstanding.
In any case, the number of issued and outstanding shares of Common Stock shall be determined after giving effect to the conversion
or exercise of equity securities of the Company by the holder and its affiliates since the date as of which such number of issued
and outstanding shares of Common Stock was reported. By written notice to the Company, the holder of a Warrant may from time to
time increase or decrease the Maximum Percentage applicable to such holder to any other percentage specified in such notice; provided,
however, that any such increase shall not be effective until the sixty-first (61st) day after such notice is delivered to
the Company.

 

4. Adjustments.

 

4.1 Stock
Dividends.

 

4.1.1 Split-Ups.
If after the date hereof, and subject to the provisions of Section 4.6 below, the number of issued and outstanding shares
of Common Stock is increased by a stock dividend of shares of Common Stock, or by a split-up of shares of Common Stock or other
similar event, then, on the effective date of such stock dividend, split-up or similar event, the number of shares of Common Stock
issuable on exercise of each Warrant shall be increased in proportion to such increase in the issued and outstanding shares of
Common Stock. A rights offering made to all or substantially all holders of shares of Common Stock entitling holders to purchase
shares of Common Stock at a price less than the “Historical Fair Market Value” (as defined below) shall be deemed a
stock dividend of a number of shares of Common Stock equal to the product of (i) the number of shares of Common Stock actually
sold in such rights offering (or issuable under any other equity securities sold in such rights offering that are convertible into
or exercisable for the shares of Common Stock) multiplied by (ii) one (1) minus the quotient of (x) the price per share of Common
Stock paid in such rights offering divided by (y) the Historical Fair Market Value. For purposes of this subsection 4.1.1,
(i) if the rights offering is for securities convertible into or exercisable for shares of Common Stock, in determining the price
payable for shares of Common Stock, there shall be taken into account any consideration received for such rights, as well as any
additional amount payable upon exercise or conversion and (ii) “Historical Fair Market Value” means the volume weighted
average price of the shares of Common Stock during the ten (10) trading day period ending on the trading day prior to the first
date on which the shares of Common Stock trade on the applicable exchange or in the applicable market, regular way, without the
right to receive such rights. No shares of Common Stock shall be issued at less than their par value.

 

    	 	8	 

    	 	 

    

 

4.1.2 Extraordinary
Dividends. If the Company, at any time while the Warrants are outstanding and unexpired, pays to all or substantially all of
the holders of Common Stock a dividend or make a distribution in cash, securities or other assets on account of such shares of
Common Stock (or other shares into which the Warrants are convertible), other than (a) as described in subsection 4.1.1
above, (b) Ordinary Cash Dividends (as defined below), (c) to satisfy the redemption rights of the holders of Common Stock in connection
with a proposed initial Business Combination, (d) to satisfy the redemption rights of the holders of Common Stock in connection
with a stockholder vote to amend the Company’s amended and restated certificate of incorporation (i) 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 Company’s public shares if it does not complete its initial Business Combination within the time
period required by the Company’s amended and restated certificate of incorporation, as amended from time to time, or (ii)
with respect to any other provision relating to stockholders’ rights or pre-initial Business Combination activity or (e)
in connection with the redemption of public shares upon the failure of the Company to complete its initial Business Combination
and any subsequent distribution of its assets upon its liquidation (any such non-excluded event being referred to herein as an
“Extraordinary Dividend”), then the Warrant Price shall be decreased, effective immediately after the
effective date of such Extraordinary Dividend, by the amount of cash and/or the fair market value (as determined by the Company’s
board of directors (the “Board”), in good faith) of any securities or other assets paid on each share
of Common Stock in respect of such Extraordinary Dividend. For purposes of this subsection 4.1.2, “Ordinary
Cash Dividends” means any cash dividend or cash distribution which, when combined on a per share basis, with the
per share amounts of all other cash dividends and cash distributions paid on the shares of Common Stock during the 365-day period
ending on the date of declaration of such dividend or distribution to the extent it does not exceed $0.50 (which amount shall be
adjusted to appropriately reflect any of the events referred to in other subsections of this Section 4 and excluding cash
dividends or cash distributions that resulted in an adjustment to the Warrant Price or to the number of shares of Common Stock
issuable on exercise of each Warrant).

 

4.2 Aggregation
of Shares. If after the date hereof, and subject to the provisions of Section 4.6 hereof, the number of issued and outstanding
shares of Common Stock is decreased by a consolidation, combination, reverse stock split, reclassification of shares of Common
Stock or other similar event, then, on the effective date of such consolidation, combination, reverse stock split, reclassification
or similar event, the number of shares of Common Stock issuable on exercise of each Warrant shall be decreased in proportion to
such decrease in issued and outstanding shares of Common Stock.

 

4.3 Adjustments
in Exercise Price. Whenever the number of shares of Common Stock purchasable upon the exercise of the Warrants is adjusted,
as provided in subsection 4.1.1 or Section 4.2 above, the Warrant Price shall be adjusted (to the nearest cent) by
multiplying such Warrant Price immediately prior to such adjustment by a fraction (x) the numerator of which shall be the number
of shares of Common Stock purchasable upon the exercise of the Warrants immediately prior to such adjustment, and (y) the denominator
of which shall be the number of shares of Common Stock so purchasable immediately thereafter.

  

4.4 Raising
of the Capital in Connection with the Initial Business Combination. If (x) the Company issues additional shares of Common Stock
or equity-linked securities for capital raising purposes in connection with the closing of its initial Business Combination at
an issue price or effective issue price of less than $9.20 per share of Common Stock (with such issue price or effective issue
price to be determined in good faith by the Board and, in the case of any such issuance to the Sponsor or its affiliates, without
taking into account any shares of Class B common stock, par value $0.0001 per share, of the Company held by the Sponsor or such
affiliates, as applicable, prior to such issuance) (the “Newly Issued Price”), (y) the aggregate gross
proceeds from such issuances represent more than 60% of the total equity proceeds, and interest thereon, available for the funding
of the Company’s initial Business Combination on the date of the completion of the Company’s initial Business Combination
(net of redemptions), and (z) the volume-weighted average trading price of the Common Stock during the twenty (20) trading day
period starting on the trading day prior to the day on which the Company consummates its initial Business Combination (such price,
the “Market Value”) is below $9.20 per share, the Warrant Price shall be adjusted (to the nearest cent)
to be equal to 115% of the higher of the Market Value and the Newly Issued Price, the $18.00 per share redemption trigger price
described in Section 6.1 and Section 6.2 shall be adjusted (to the nearest cent) to be equal to 180% of the higher
of the Market Value and the Newly Issued Price and the $10.00 per share redemption trigger price described in Section 6.2
shall be adjusted (to the nearest cent) to be equal to the higher of the Market Value and the Newly Issued Price.

 

    	 	9	 

    	 	 

    

 

4.5 Replacement
of Securities upon Reorganization, etc. In case of any reclassification or reorganization of the issued and outstanding shares
of Common Stock (other than a change under Section 4.1 or Section 4.2 hereof or that solely affects the par value
of such shares of Common Stock), or in the case of any merger or consolidation of the Company with or into another corporation
(other than a merger or consolidation in which the Company is the continuing corporation and that does not result in any reclassification
or reorganization of the issued and outstanding shares of Common Stock), or in the case of any sale or conveyance to another corporation
or entity of the assets or other property of the Company as an entirety or substantially as an entirety in connection with which
the Company is dissolved, the holders of the Warrants shall thereafter have the right to purchase and receive, upon the basis and
upon the terms and conditions specified in the Warrants and in lieu of the shares of Common Stock of the Company immediately theretofore
purchasable and receivable upon the exercise of the rights represented thereby, the kind and amount of shares, stock or other equity
securities or property (including cash) receivable upon such reclassification, reorganization, merger or consolidation, or upon
a dissolution following any such sale or transfer, that the holder of the Warrants would have received if such holder had exercised
his, her or its Warrant(s) immediately prior to such event (the “Alternative Issuance”); provided,
however, that (i) if the holders of Common Stock were entitled to exercise a right of election as to the kind or amount
of securities, cash or other assets receivable upon such merger or consolidation, then the kind and amount of securities, cash
or other assets constituting the Alternative Issuance for which each Warrant shall become exercisable shall be deemed to be the
weighted average of the kind and amount received per share by the holders of the Common Stock in such merger or consolidation that
affirmatively make such election, and (ii) if a tender, exchange or redemption offer shall have been made to and accepted by the
holders of Common Stock (other than a tender, exchange or redemption offer made by the Company in connection with redemption rights
held by stockholders of the Company as provided for in the Company’s amended and restated certificate of incorporation or
as a result of the repurchase of shares of Common Stock by the Company if a proposed initial Business Combination is presented
to the stockholders of the Company for approval) under circumstances in which, upon completion of such tender or exchange offer,
the maker thereof, together with members of any group (within the meaning of Rule 13d-5(b)(1) under the Exchange Act) of which
such maker is a part, and together with any affiliate or associate of such maker (within the meaning of Rule 12b-2 under the Exchange
Act) and any members of any such group of which any such affiliate or associate is a part, own beneficially (within the meaning
of Rule 13d-3 under the Exchange Act) more than 50% of the issued and outstanding shares of Common Stock, the holder of a Warrant
shall be entitled to receive as the Alternative Issuance, the highest amount of cash, securities or other property to which such
holder would actually have been entitled as a stockholder if such Warrant holder had exercised the Warrant prior to the expiration
of such tender or exchange offer, accepted such offer and all of the shares of Common Stock held by such holder had been purchased
pursuant to such tender or exchange offer, subject to adjustments (from and after the consummation of such tender or exchange offer)
as nearly equivalent as possible to the adjustments provided for in this Section 4; provided further that if less
than 70% of the consideration receivable by the holders of Common Stock in the applicable event is payable in the form of common
stock in the successor entity that is listed for trading on a national securities exchange or is quoted in an established over-the-counter
market, or is to be so listed for trading or quoted immediately following such event, and if the Registered Holder properly exercises
the Warrant within thirty (30) days following the public disclosure of the consummation of such applicable event by the Company
pursuant to a Current Report on Form 8-K filed with the Commission, the Warrant Price shall be reduced by an amount (in dollars)
equal to the difference of (i) the Warrant Price in effect prior to such reduction minus (ii) (A) the Per Share Consideration (as
defined below) (but in no event less than zero) minus (B) the Black-Scholes Warrant Value (as defined below). The “Black-Scholes
Warrant Value” means the value of a Warrant immediately prior to the consummation of the applicable event based on
the Black-Scholes Warrant Model for a Capped American Call on Bloomberg Financial Markets (assuming zero dividends) (“Bloomberg”).
For purposes of calculating such amount, (i) Section 6 of this Agreement shall be taken into account, (ii) the price of
each share of Common Stock shall be the volume weighted average price of the Common Stock during the ten (10) trading day period
ending on the trading day prior to the effective date of the applicable event, (iii) the assumed volatility shall be the 90 day
volatility obtained from the HVT function on Bloomberg determined as of the trading day immediately prior to the day of the announcement
of the applicable event and (iv) the assumed risk-free interest rate shall correspond to the U.S. Treasury rate for a period equal
to the remaining term of the Warrant. “Per Share Consideration” means (i) if the consideration paid to
holders of Common Stock consists exclusively of cash, the amount of such cash per share of Common Stock, and (ii) in all other
cases, the volume weighted average price of the Common Stock during the ten (10) trading day period ending on the trading day prior
to the effective date of the applicable event. If any reclassification or reorganization also results in a change in shares of
Common Stock covered by subsection 4.1.1, then such adjustment shall be made pursuant to subsection 4.1.1 or Sections
4.2, 4.3 and this Section 4.4. The provisions of this Section 4.4 shall similarly apply to successive
reclassifications, reorganizations, mergers or consolidations, sales or other transfers. In no event shall the Warrant Price be
reduced to less than the par value per share issuable upon exercise of such Warrant.

 

    	 	10	 

    	 	 

    

 

4.6 Notices
of Changes in Warrant. Upon every adjustment of the Warrant Price or the number of shares issuable upon exercise of a Warrant,
the Company shall give written notice thereof to the Warrant Agent, which notice shall state the Warrant Price resulting from such
adjustment and the increase or decrease, if any, in the number of shares purchasable at such price upon the exercise of a Warrant,
setting forth in reasonable detail the method of calculation and the facts upon which such calculation is based. Upon the occurrence
of any event specified in Sections 4.1, 4.2, 4.3, 4.4, 4.5 or 4.9, the Company shall
give written notice of the occurrence of such event to each holder of a Warrant, at the last address set forth for such holder
in the Warrant Register, of the record date or the effective date of the event. Failure to give such notice, or any defect therein,
shall not affect the legality or validity of such event.

 

4.7 No
Fractional Shares. Notwithstanding any provision contained in this Agreement to the contrary, the Company shall not issue fractional
shares upon the exercise of Warrants. If, by reason of any adjustment made pursuant to this Section 4, the holder of any
Warrant would be entitled, upon the exercise of such Warrant, to receive a fractional interest in a share, the Company shall, upon
such exercise, round down to the nearest whole number the number of shares of Common Stock to be issued to such holder.

 

4.8 Form
of Warrant. The form of Warrant need not be changed because of any adjustment pursuant to this Section 4, and Warrants
issued after such adjustment may state the same Warrant Price and the same number of shares as is stated in the Warrants initially
issued pursuant to this Agreement; provided, however, that the Company may at any time in its sole discretion make
any change in the form of Warrant that the Company may deem appropriate and that does not affect the substance thereof, and any
Warrant thereafter issued or countersigned, whether in exchange or substitution for an outstanding Warrant or otherwise, may be
in the form as so changed.

 

4.9 Other
Events. In case any event shall occur affecting the Company as to which none of the provisions of the preceding subsections
of this Section 4 are strictly applicable, but which would require an adjustment to the terms of the Warrants in order to
(i) avoid an adverse impact on the Warrants and (ii) effectuate the intent and purpose of this Section 4, then, in each
such case, the Company shall appoint a firm of independent registered public accountants, investment banking or other appraisal
firm of recognized national standing, which shall give its opinion as to whether or not any adjustment to the rights represented
by the Warrants is necessary to effectuate the intent and purpose of this Section 4 and, if they determine that an adjustment
is necessary, the terms of such adjustment; provided, however, that under no circumstances shall the Warrants be
adjusted pursuant to this Section 4.9 as a result of any issuance of securities in connection with a Business Combination.
The Company shall adjust the terms of the Warrants in a manner that is consistent with any adjustment recommended in such opinion.

 

    	 	11	 

    	 	 

    

 

5. Transfer
and Exchange of Warrants.

 

5.1 Registration
of Transfer. The Warrant Agent shall register the transfer, from time to time, of any outstanding Warrant upon the Warrant
Register, upon surrender of such Warrant for transfer, properly endorsed with signatures properly guaranteed and accompanied by
appropriate instructions for transfer. Upon any such transfer, a new Warrant representing an equal aggregate number of Warrants
shall be issued and the old Warrant shall be cancelled by the Warrant Agent. In the case of certificated Warrants, the Warrants
so cancelled shall be delivered by the Warrant Agent to the Company from time to time upon request.

 

5.2 Procedure
for Surrender of Warrants. Warrants may be surrendered to the Warrant Agent, together with a written request for exchange or
transfer, and thereupon the Warrant Agent shall issue in exchange therefor one or more new Warrants as requested by the Registered
Holder of the Warrants so surrendered, representing an equal aggregate number of Warrants; provided, however, that
except as otherwise provided herein or with respect to any Book-Entry Warrant, each Book-Entry Warrant may be transferred only
in whole and only to the Depositary, to another nominee of the Depositary, to a successor depository, or to a nominee of a successor
depository; provided further, however that in the event that a Warrant surrendered for transfer bears a restrictive
legend (as in the case of the Private Placement Warrants), the Warrant Agent shall not cancel such Warrant and issue new Warrants
in exchange thereof until the Warrant Agent has received an opinion of counsel for the Company stating that such transfer may be
made and indicating whether the new Warrants must also bear a restrictive legend.

 

5.3 Fractional
Warrants. The Warrant Agent shall not be required to effect any registration of transfer or exchange which shall result in
the issuance of a warrant certificate or book-entry position for a fraction of a warrant, except as part of the Units.

 

5.4 Service
Charges. No service charge shall be made for any exchange or registration of transfer of Warrants.

 

5.5 Warrant
Execution and Countersignature. The Warrant Agent is hereby authorized to countersign and to deliver, in accordance with the
terms of this Agreement, the Warrants required to be issued pursuant to the provisions of this Section 5, and the Company,
whenever required by the Warrant Agent, shall supply the Warrant Agent with Warrants duly executed on behalf of the Company for
such purpose.

 

5.6 Transfer
of Warrants. Prior to the Detachment Date, the Public Warrants may be transferred or exchanged only together with the Unit
in which such Warrant is included, and only for the purpose of effecting, or in conjunction with, a transfer or exchange of such
Unit. Furthermore, each transfer of a Unit on the register relating to such Units shall operate also to transfer the Warrants included
in such Unit. Notwithstanding the foregoing, the provisions of this Section 5.6 shall have no effect on any transfer of
Warrants on and after the Detachment Date.

 

    	 	12	 

    	 	 

    

 

6. Redemption.

 

6.1 Redemption
of Warrants for Cash. Subject to Section 6.6 hereof, not less than all of the outstanding Warrants may be redeemed,
at the option of the Company, at any time during the Exercise Period, at the office of the Warrant Agent, upon notice to the Registered
Holders of the Warrants, as described in Section 6.4 below, at a Redemption Price of $0.01 per Warrant, provided
that (a) the Reference Value equals or exceeds $18.00 per share (subject to adjustment in compliance with Section 4 hereof)
and (b) there is an effective registration statement covering the issuance of the shares of Common Stock issuable upon exercise
of the Warrants, and a current prospectus relating thereto, available throughout the 30-day Redemption Period (as defined in Section
6.4 below).

 

6.2 Redemption
of Warrants for shares of Common Stock. Subject to Section 6.6 hereof, not less than all of the outstanding Warrants
may be redeemed, at the option of the Company, at any time during the Exercise Period, at the office of the Warrant Agent, upon
notice to the Registered Holders of the Warrants, as described in Section 6.4 below, at a Redemption Price of $0.10 per
Warrant, provided that (i) the Reference Value equals or exceeds $10.00 per share (subject to adjustment in compliance with
Section 4 hereof) and (ii) if the Reference Value is less than $18.00 per share (subject to adjustment in compliance with
Section 4 hereof), the Private Placement Warrants are also concurrently called for redemption on the same terms as the outstanding
Public Warrants. During the 30-day Redemption Period in connection with a redemption pursuant to this Section 6.2, Registered
Holders of the Warrants may elect to exercise their Warrants on a “cashless basis” pursuant to subsection 3.3.1
and receive a number of shares of Common Stock determined by reference to the table below, based on the Redemption Date (calculated
for purposes of the table as the period to expiration of the Warrants) and the “Redemption Fair Market Value” (as such
term is defined in this Section 6.2) (a “Make-Whole Exercise”). Solely for purposes of this Section
6.2, the “Redemption Fair Market Value” shall mean the volume weighted average price of the Common
Stock during the ten (10) trading days immediately following the date on which notice of redemption pursuant to this Section
6.2 is sent to the Registered Holders. In connection with any redemption pursuant to this Section 6.2, the Company shall
provide the Registered Holders with the Redemption Fair Market Value no later than one (1) Business Day after the ten (10) trading
day period described above ends.

 

	Redemption Date	 	Redemption Fair Market Value of shares of Common Stock	 
	(period to expiration of warrants)	 	≤10.00	 	 	11.00	 	 	12.00	 	 	13.00	 	 	14.00	 	 	15.00	 	 	16.00	 	 	17.00	 	 	≥18.00	 
	60 months	 	 	0.261	 	 	 	0.281	 	 	 	0.297	 	 	 	0.311	 	 	 	0.324	 	 	 	0.337	 	 	 	0.348	 	 	 	0.358	 	 	 	0.361	 
	57 months	 	 	0.257	 	 	 	0.277	 	 	 	0.294	 	 	 	0.310	 	 	 	0.324	 	 	 	0.337	 	 	 	0.348	 	 	 	0.358	 	 	 	0.361	 
	54 months	 	 	0.252	 	 	 	0.272	 	 	 	0.291	 	 	 	0.307	 	 	 	0.322	 	 	 	0.335	 	 	 	0.347	 	 	 	0.357	 	 	 	0.361	 
	51 months	 	 	0.246	 	 	 	0.268	 	 	 	0.287	 	 	 	0.304	 	 	 	0.320	 	 	 	0.333	 	 	 	0.346	 	 	 	0.357	 	 	 	0.361	 
	48 months	 	 	0.241	 	 	 	0.263	 	 	 	0.283	 	 	 	0.301	 	 	 	0.317	 	 	 	0.332	 	 	 	0.344	 	 	 	0.356	 	 	 	0.361	 
	45 months	 	 	0.235	 	 	 	0.258	 	 	 	0.279	 	 	 	0.298	 	 	 	0.315	 	 	 	0.330	 	 	 	0.343	 	 	 	0.356	 	 	 	0.361	 
	42 months	 	 	0.228	 	 	 	0.252	 	 	 	0.274	 	 	 	0.294	 	 	 	0.312	 	 	 	0.328	 	 	 	0.342	 	 	 	0.355	 	 	 	0.361	 
	39 months	 	 	0.221	 	 	 	0.246	 	 	 	0.269	 	 	 	0.290	 	 	 	0.309	 	 	 	0.325	 	 	 	0.340	 	 	 	0.354	 	 	 	0.361	 
	36 months	 	 	0.213	 	 	 	0.239	 	 	 	0.263	 	 	 	0.285	 	 	 	0.305	 	 	 	0.323	 	 	 	0.339	 	 	 	0.353	 	 	 	0.361	 
	33 months	 	 	0.205	 	 	 	0.232	 	 	 	0.257	 	 	 	0.280	 	 	 	0.301	 	 	 	0.320	 	 	 	0.337	 	 	 	0.352	 	 	 	0.361	 
	30 months	 	 	0.196	 	 	 	0.224	 	 	 	0.250	 	 	 	0.274	 	 	 	0.297	 	 	 	0.316	 	 	 	0.335	 	 	 	0.351	 	 	 	0.361	 
	27 months	 	 	0.185	 	 	 	0.214	 	 	 	0.242	 	 	 	0.268	 	 	 	0.291	 	 	 	0.313	 	 	 	0.332	 	 	 	0.350	 	 	 	0.361	 
	24 months	 	 	0.173	 	 	 	0.204	 	 	 	0.233	 	 	 	0.260	 	 	 	0.285	 	 	 	0.308	 	 	 	0.329	 	 	 	0.348	 	 	 	0.361	 
	21 months	 	 	0.161	 	 	 	0.193	 	 	 	0.223	 	 	 	0.252	 	 	 	0.279	 	 	 	0.304	 	 	 	0.326	 	 	 	0.347	 	 	 	0.361	 
	18 months	 	 	0.146	 	 	 	0.179	 	 	 	0.211	 	 	 	0.242	 	 	 	0.271	 	 	 	0.298	 	 	 	0.322	 	 	 	0.345	 	 	 	0.361	 
	15 months	 	 	0.130	 	 	 	0.164	 	 	 	0.197	 	 	 	0.230	 	 	 	0.262	 	 	 	0.291	 	 	 	0.317	 	 	 	0.342	 	 	 	0.361	 
	12 months	 	 	0.111	 	 	 	0.146	 	 	 	0.181	 	 	 	0.216	 	 	 	0.250	 	 	 	0.282	 	 	 	0.312	 	 	 	0.339	 	 	 	0.361	 
	9 months	 	 	0.090	 	 	 	0.125	 	 	 	0.162	 	 	 	0.199	 	 	 	0.237	 	 	 	0.272	 	 	 	0.305	 	 	 	0.336	 	 	 	0.361	 
	6 months	 	 	0.065	 	 	 	0.099	 	 	 	0.137	 	 	 	0.178	 	 	 	0.219	 	 	 	0.259	 	 	 	0.296	 	 	 	0.331	 	 	 	0.361	 
	3 months	 	 	0.034	 	 	 	0.065	 	 	 	0.104	 	 	 	0.150	 	 	 	0.197	 	 	 	0.243	 	 	 	0.286	 	 	 	0.326	 	 	 	0.361	 
	0 months	 	 	—	 	 	 	—	 	 	 	0.042	 	 	 	0.115	 	 	 	0.179	 	 	 	0.233	 	 	 	0.281	 	 	 	0.323	 	 	 	0.361	 

 

    	 	13	 

    	 	 

    

 

The exact Redemption Fair Market Value and
Redemption Date may not be set forth in the table above, in which case, if the Redemption Fair Market Value is between two values
in the table or the Redemption Date is between two redemption dates in the table, the number of shares of Common Stock to be issued
for each Warrant exercised in a Make-Whole Exercise shall be determined by a straight-line interpolation between the number of
shares set forth for the higher and lower Redemption Fair Market Values and the earlier and later redemption dates, as applicable,
based on a 365- or 366-day year, as applicable.

 

6.3 The
stock prices set forth in the column headings of the table above shall be adjusted as of any date on which the number of shares
issuable upon exercise of a Warrant or the Exercise Price is adjusted pursuant to Section 4 hereof. If the number of shares
issuable upon exercise of a Warrant is adjusted pursuant to Section 4 hereof, the adjusted stock prices in the column headings
shall equal the stock prices immediately prior to such adjustment, multiplied by a fraction, the numerator of which is the number
of shares deliverable upon exercise of a Warrant immediately prior to such adjustment and the denominator of which is the number
of shares deliverable upon exercise of a Warrant as so adjusted. The number of shares in the table above shall be adjusted in the
same manner and at the same time as the number of shares issuable upon exercise of a Warrant. If the Exercise Price is adjusted,
(a) in the case of an adjustment pursuant to Section 4.4 hereof, the adjusted stock prices in the column headings shall
equal the stock prices immediately prior to such adjustment multiplied by a fraction, the numerator of which is the higher of the
Market Value and the Newly Issued Price and the denominator of which is $10.00 and (b) in the case of an adjustment pursuant to
Section 4.1.2 hereof, the adjusted stock prices in the column headings shall equal the stock prices immediately prior to
such adjustment less the decrease in the Exercise Price pursuant to such Exercise Price adjustment. In no event shall the Warrants
be exercisable in connection with a Make-Whole Exercise for more than 0.361 shares of Common Stock per Warrant (subject to adjustment).

 

6.4 Date
Fixed for, and Notice of, Redemption; Redemption Price; Reference Value. In the event that the Company elects to redeem the
Warrants pursuant to Sections 6.1 or 6.2, the Company shall fix a date for the redemption (the “Redemption
Date”). Notice of redemption shall be mailed by first class mail, postage prepaid, by the Company not less than thirty
(30) days prior to the Redemption Date (the period lasting from such time until the Redemption Date, the “30-day Redemption
Period”) to the Registered Holders of the Warrants to be redeemed at their last addresses as they shall appear on
the registration books. Any notice mailed in the manner herein provided shall be conclusively presumed to have been duly given
whether or not the Registered Holder received such notice. As used in this Agreement, (a) “Redemption Price”
shall mean the price per Warrant at which any Warrants are redeemed pursuant to Sections 6.1 or 6.2 and (b) “Reference
Value” shall mean the last reported sales price of the shares of Common Stock for any twenty (20) trading days within
the thirty (30) trading-day period ending on the third (3rd) trading day prior to the date on which notice of the redemption
is given.

 

    	 	14	 

    	 	 

    

 

6.5 Exercise
After Notice of Redemption. The Warrants may be exercised, for cash (or on a “cashless basis” in accordance with
Section 6.2 of this Agreement) at any time after notice of redemption shall have been given by the Company pursuant to Section
6.4 hereof and prior to the Redemption Date. On and after the Redemption Date, the record holder of the Warrants shall have
no further rights except to receive, upon surrender of the Warrants, the Redemption Price.

 

6.6 Exclusion
of Private Placement Warrants. The Company agrees that (a) the redemption rights provided in Section 6.1 hereof
shall not apply to the Private Placement Warrants if at the time of the redemption such Private Placement Warrants continue to
be held by the Sponsor or its Permitted Transferees and (b) if the Reference Value equals or exceeds $18.00 per share (subject
to adjustment in compliance with Section 4 hereof), the redemption rights provided in Section 6.2 hereof shall not
apply to the Private Placement Warrants if at the time of the redemption such Private Placement Warrants continue to be held by
the Sponsor or its Permitted Transferees. However, once such Private Placement Warrants are transferred (other than to Permitted
Transferees in accordance with Section 2.6 hereof), the Company may redeem the Private Placement Warrants pursuant to Section
6.1 or 6.2 hereof, provided that the criteria for redemption are met, including the opportunity of the holder of such
Private Placement Warrants to exercise the Private Placement Warrants prior to redemption pursuant to Section 6.5 hereof.
Private Placement Warrants that are transferred to persons other than Permitted Transferees shall upon such transfer cease to be
Private Placement Warrants and shall become Public Warrants under this Agreement, including for purposes of Section 9.8
hereof.

 

7. Other
Provisions Relating to Rights of Holders of Warrants.

 

7.1 No
Rights as Stockholder. A Warrant does not entitle the Registered Holder thereof to any of the rights of a stockholder of the
Company, including, without limitation, the right to receive dividends, or other distributions, exercise any preemptive rights
to vote or to consent or to receive notice as stockholders in respect of the meetings of stockholders or the election of directors
of the Company or any other matter.

 

7.2 Lost,
Stolen, Mutilated, or Destroyed Warrants. If any Warrant is lost, stolen, mutilated, or destroyed, the Company and the Warrant
Agent may on such terms as to indemnity or otherwise as they may in their discretion impose (which shall, in the case of a mutilated
Warrant, include the surrender thereof), issue a new Warrant of like denomination, tenor, and date as the Warrant so lost, stolen,
mutilated, or destroyed. Any such new Warrant shall constitute a substitute contractual obligation of the Company, whether or not
the allegedly lost, stolen, mutilated, or destroyed Warrant shall be at any time enforceable by anyone.

 

7.3 Reservation
of Shares of Common Stock. The Company shall at all times reserve and keep available a number of its authorized but unissued
shares of Common Stock that shall be sufficient to permit the exercise in full of all outstanding Warrants issued pursuant to this
Agreement.

 

    	 	15	 

    	 	 

    

 

7.4 Registration
of Shares of Common Stock; Cashless Exercise at Company’s Option.

 

7.4.1 Registration
of the shares of Common Stock. The Company agrees that as soon as practicable, but in no event later than fifteen (15) Business
Days after the closing of its initial Business Combination, it shall use its commercially reasonable efforts to file with the Commission
a registration statement for the registration, under the Securities Act, of the shares of Common Stock issuable upon exercise of
the Warrants. The Company shall use its commercially reasonable efforts to cause the same to become effective within sixty (60)
Business Days following the closing of its initial Business Combination and to maintain the effectiveness of such registration
statement, and a current prospectus relating thereto, until the expiration or redemption of the Warrants in accordance with the
provisions of this Agreement. If any such registration statement has not been declared effective by the sixtieth (60th)
Business Day following the closing of the Business Combination, holders of the Warrants shall have the right, during the period
beginning on the sixty-first (61st) Business Day after the closing of the Business Combination and ending upon such
registration statement being declared effective by the Commission, and during any other period when the Company shall fail to have
maintained an effective registration statement covering the issuance of the shares of Common Stock issuable upon exercise of the
Warrants, to exercise such Warrants on a “cashless basis,” by exchanging the Warrants (in accordance with Section 3(a)(9)
of the Securities Act or another exemption) for that number of shares of Common Stock equal to the lesser of (A) the quotient
obtained by dividing (x) the product of the number of shares of Common Stock underlying the Warrants, multiplied by the excess
of the “Fair Market Value” (as defined below) less the Warrant Price by (y) the Fair Market Value and (B) 0.361.
Solely for purposes of this subsection 7.4.1, “Fair Market Value” shall mean the volume-weighted
average price of the shares of Common Stock as reported during the ten (10) trading day period ending on the trading day prior
to the date that notice of exercise is received by the Warrant Agent from the holder of such Warrants or its securities broker
or intermediary. The date that notice of “cashless exercise” is received by the Warrant Agent shall be conclusively
determined by the Warrant Agent. In connection with the “cashless exercise” of a Public Warrant, the Company shall,
upon request, provide the Warrant Agent with an opinion of counsel for the Company (which shall be an outside law firm with securities
law experience) stating that (i) the exercise of the Warrants on a “cashless basis” in accordance with this subsection
7.4.1 is not required to be registered under the Securities Act and (ii) the shares of Common Stock issued upon such exercise
shall be freely tradable under United States federal securities laws by anyone who is not an affiliate (as such term is defined
in Rule 144 under the Securities Act) of the Company and, accordingly, shall not be required to bear a restrictive legend. Except
as provided in subsection 7.4.2, for the avoidance of doubt, unless and until all of the Warrants have been exercised or
have expired, the Company shall continue to be obligated to comply with its registration obligations under the first three sentences
of this subsection 7.4.1.

 

7.4.2 Cashless
Exercise at Company’s Option. If the shares of Common Stock are at the time of any exercise of a Public Warrant not listed
on a national securities exchange such that they satisfy the definition of a “covered security” under Section 18(b)(1)
of the Securities Act, the Company may, at its option, (i) require holders of Public Warrants who exercise Public Warrants to exercise
such Public Warrants on a “cashless basis” in accordance with Section 3(a)(9) of the Securities Act as described in
subsection 7.4.1 and (ii) in the event the Company so elects, the Company shall (x) not be required to file or maintain
in effect a registration statement for the registration, under the Securities Act, of the shares of Common Stock issuable upon
exercise of the Warrants, notwithstanding anything in this Agreement to the contrary, and (y) use its commercially reasonable efforts
to register or qualify for sale the shares of Common Stock issuable upon exercise of the Public Warrant under applicable blue sky
laws to the extent an exemption is not available.

 

    	 	16	 

    	 	 

    

 

8. Concerning
the Warrant Agent and Other Matters.

 

8.1 Payment
of Taxes. The Company shall from time to time promptly pay all taxes and charges that may be imposed upon the Company or the
Warrant Agent in respect of the issuance or delivery of shares of Common Stock upon the exercise of the Warrants, but the Company
shall not be obligated to pay any transfer taxes in respect of the Warrants or such shares.

 

8.2 Resignation,
Consolidation, or Merger of Warrant Agent.

 

8.2.1 Appointment
of Successor Warrant Agent. The Warrant Agent, or any successor to it hereafter appointed, may resign its duties and be discharged
from all further duties and liabilities hereunder after giving sixty (60) days’ notice in writing to the Company. If the
office of the Warrant Agent becomes vacant by resignation or incapacity to act or otherwise, the Company shall appoint in writing
a successor Warrant Agent in place of the Warrant Agent. If the Company shall fail to make such appointment within a period of
thirty (30) days after it has been notified in writing of such resignation or incapacity by the Warrant Agent or by the holder
of a Warrant (who shall, with such notice, submit his, her or its Warrant for inspection by the Company), then the holder of any
Warrant may apply to the Supreme Court of the State of New York for the County of New York for the appointment of a successor Warrant
Agent at the Company’s cost. Any successor Warrant Agent, whether appointed by the Company or by such court, shall be a corporation
or other entity organized and existing under the laws of the State of New York, in good standing and having its principal office
in the United States of America, and authorized under such laws to exercise corporate trust powers and subject to supervision or
examination by federal or state authority. After appointment, any successor Warrant Agent shall be vested with all the authority,
powers, rights, immunities, duties, and obligations of its predecessor Warrant Agent with like effect as if originally named as
Warrant Agent hereunder, without any further act or deed; but if for any reason it becomes necessary or appropriate, the predecessor
Warrant Agent shall execute and deliver, at the expense of the Company, an instrument transferring to such successor Warrant Agent
all the authority, powers, and rights of such predecessor Warrant Agent hereunder; and upon request of any successor Warrant Agent
the Company shall make, execute, acknowledge, and deliver any and all instruments in writing for more fully and effectually vesting
in and confirming to such successor Warrant Agent all such authority, powers, rights, immunities, duties, and obligations.

 

8.2.2 Notice
of Successor Warrant Agent. In the event a successor Warrant Agent shall be appointed, the Company shall give notice thereof
to the predecessor Warrant Agent and the Transfer Agent for the shares of Common Stock not later than the effective date of any
such appointment.

 

    	 	17	 

    	 	 

    

 

8.2.3 Merger
or Consolidation of Warrant Agent. Any entity into which the Warrant Agent may be merged or with which it may be consolidated
or any entity resulting from any merger or consolidation to which the Warrant Agent shall be a party shall be the successor Warrant
Agent under this Agreement without any further act.

 

8.3 Fees
and Expenses of Warrant Agent.

 

8.3.1 Remuneration.
The Company agrees to pay the Warrant Agent reasonable remuneration for its services as such Warrant Agent hereunder and shall,
pursuant to its obligations under this Agreement, reimburse the Warrant Agent upon demand for all expenditures that the Warrant
Agent may reasonably incur in the execution of its duties hereunder.

 

8.3.2 Further
Assurances. The Company agrees to perform, execute, acknowledge, and deliver or cause to be performed, executed, acknowledged,
and delivered all such further and other acts, instruments, and assurances as may reasonably be required by the Warrant Agent for
the carrying out or performing of the provisions of this Agreement.

 

8.4 Liability
of Warrant Agent.

 

8.4.1 Reliance
on Company Statement. Whenever in the performance of its duties under this Agreement, the Warrant Agent shall deem it necessary
or desirable that any fact or matter be proved or established by the Company prior to taking or suffering any action hereunder,
such fact or matter (unless other evidence in respect thereof be herein specifically prescribed) may be deemed to be conclusively
proved and established by a statement signed by the Chief Executive Officer, the President, the Chief Financial Officer, the Secretary
or the Chairman of the Board of the Company and delivered to the Warrant Agent. The Warrant Agent may rely upon such statement
for any action taken or suffered in good faith by it pursuant to the provisions of this Agreement.

 

8.4.2 Indemnity.
The Warrant Agent shall be liable hereunder only for its own gross negligence, willful misconduct, fraud or bad faith. The Company
agrees to indemnify the Warrant Agent and save it harmless against any and all liabilities, including judgments, out-of-pocket
costs and reasonable outside counsel fees, for anything done or omitted by the Warrant Agent in the execution of this Agreement,
except as a result of the Warrant Agent’s gross negligence, willful misconduct, fraud or bad faith.

 

8.4.3 Exclusions.
The Warrant Agent shall have no responsibility with respect to the validity of this Agreement or with respect to the validity or
execution of any Warrant (except its countersignature thereof). The Warrant Agent shall not be responsible for any breach by the
Company of any covenant or condition contained in this Agreement or in any Warrant. The Warrant Agent shall not be responsible
to make any adjustments required under the provisions of Section 4 hereof or responsible for the manner, method, or amount
of any such adjustment or the ascertaining of the existence of facts that would require any such adjustment; nor shall it by any
act hereunder be deemed to make any representation or warranty as to the authorization or reservation of any shares of Common Stock
to be issued pursuant to this Agreement or any Warrant or as to whether any shares of Common Stock shall, when issued, be valid
and fully paid and nonassessable.

 

    	 	18	 

    	 	 

    

 

8.5 Acceptance
of Agency. The Warrant Agent hereby accepts the agency established by this Agreement and agrees to perform the same upon the
terms and conditions herein set forth and among other things, shall account promptly to the Company with respect to Warrants exercised
and concurrently account for, and pay to the Company, all monies received by the Warrant Agent for the purchase of shares of Common
Stock through the exercise of the Warrants.

 

8.6 Waiver.
The Warrant Agent has no right of set-off or any other right, title, interest or claim of any kind (“Claim”)
in, or to any distribution of, the Trust Account (as defined in that certain Investment Management Trust Agreement, dated as of
the date hereof, by and between the Company and Continental Stock Transfer & Trust Company as trustee thereunder) and hereby
agrees not to seek recourse, reimbursement, payment or satisfaction for any Claim against the Trust Account for any reason whatsoever.
The Warrant Agent hereby waives any and all Claims against the Trust Account and any and all rights to seek access to the Trust
Account.

 

9. Miscellaneous
Provisions.

 

9.1 Successors.
All the covenants and provisions of this Agreement by or for the benefit of the Company or the Warrant Agent shall bind and inure
to the benefit of their respective successors and assigns.

 

9.2 Notices.
Any notice, statement or demand authorized by this Agreement to be given or made by the Warrant Agent or by the holder of any Warrant
to or on the Company shall be sufficiently given when so delivered if by hand or overnight delivery or if sent by certified mail
or private courier service within five (5) days after deposit of such notice, postage prepaid, addressed (until another address
is filed in writing by the Company with the Warrant Agent), as follows:

 

FirstMark Horizon Acquisition Corp.

100 5th Ave, 3rd Floor

New York, NY 10011

Attention: Chief Executive Officer

 

Any notice, statement or demand authorized by this Agreement
to be given or made by the holder of any Warrant or by the Company to or on the Warrant Agent shall be sufficiently given when
so delivered if by hand or overnight delivery or if sent by certified mail or private courier service within five (5) days after
deposit of such notice, postage prepaid, addressed (until another address is filed in writing by the Warrant Agent with the Company),
as follows:

 

Continental Stock Transfer & Trust Company

One State Street, 30th Floor

New York, NY 10004

Attention: Compliance Department

 

    	 	19	 

    	 	 

    

 

9.3 Applicable
Law. The validity, interpretation, and performance of this Agreement and of the Warrants shall be governed in all respects
by the laws of the State of New York. Subject to applicable law, the Company hereby agrees that any action, proceeding or claim
against it arising out of or relating in any way to this Agreement shall be brought and enforced in the courts of the State of
New York or the United States District Court for the Southern District of New York, and irrevocably submits to such jurisdiction,
which jurisdiction shall be exclusive forum for any such action, proceeding or claim. The Company hereby waives any objection to
such exclusive jurisdiction and that such courts represent an inconvenient forum. Notwithstanding the foregoing, the provisions
of this paragraph will not apply to suits brought to enforce any liability or duty created by the Exchange Act or any other claim
for which the federal district courts of the United States of America are the sole and exclusive forum.

 

Any person or entity purchasing or otherwise
acquiring any interest in the Warrants shall be deemed to have notice of and to have consented to the forum provisions in this
Section 9.3. If any action, the subject matter of which is within the scope the forum provisions above, is filed in a court other
than a court located within the State of New York or the United States District Court for the Southern District of New York (a
“foreign action”) in the name of any warrant holder, such warrant holder shall be deemed to have consented to: (x)
the personal jurisdiction of the state and federal courts located within the State of New York or the United States District Court
for the Southern District of New York in connection with any action brought in any such court to enforce the forum provisions (an
“enforcement action”), and (y) having service of process made upon such warrant holder in any such enforcement action
by service upon such warrant holder’s counsel in the foreign action as agent for such warrant holder.

 

9.4 Persons
Having Rights under this Agreement. Nothing in this Agreement shall be construed to confer upon, or give to, any person, corporation
or other entity other than the parties hereto and the Registered Holders of the Warrants any right, remedy, or claim under or by
reason of this Agreement or of any covenant, condition, stipulation, promise, or agreement hereof. All covenants, conditions, stipulations,
promises, and agreements contained in this Agreement shall be for the sole and exclusive benefit of the parties hereto and their
successors and assigns and of the Registered Holders of the Warrants.

 

9.5 Examination
of the Warrant Agreement. A copy of this Agreement shall be available at all reasonable times at the office of the Warrant
Agent in the United States of America, for inspection by the Registered Holder of any Warrant. The Warrant Agent may require any
such holder to submit such holder’s Warrant for inspection by the Warrant Agent.

 

9.6 Counterparts;
Electronic Signatures. This Agreement may be executed in any number of original or facsimile counterparts and each of such
counterparts shall for all purposes be deemed to be an original, and all such counterparts shall together constitute but one and
the same instrument. A signature to this Agreement transmitted electronically shall have the same authority, effect, and enforceability
as an original signature.

 

9.7 Effect
of Headings. The section headings herein are for convenience only and are not part of this Agreement and shall not affect the
interpretation thereof.

 

    	 	20	 

    	 	 

    

 

9.8 Amendments.
This Agreement may be amended by the parties hereto without the consent of any Registered Holder for the purpose of curing any
ambiguity or correcting any mistake, including conforming the provisions hereof to the description of the terms of the Warrants
and this Agreement set forth in the Prospectus, or defective provision contained herein or adding or changing any provisions with
respect to matters or questions arising under this Agreement as the parties may deem necessary or desirable and that the parties
deem shall not adversely affect the interest of the Registered Holders under this Agreement. All other modifications or amendments,
including any modification or amendment to increase the Warrant Price or shorten the Exercise Period and any amendment to the terms
of only the Private Placement Warrants, shall require the vote or written consent of the Registered Holders of 65% of the then
outstanding Public Warrants and, solely with respect to any amendment to the terms of the Private Placement Warrants or any provision
of this agreement with respect to the Private Placement Warrants, at least 65% of the then outstanding Private Placement Warrants.
Notwithstanding the foregoing, the Company may lower the Warrant Price or extend the duration of the Exercise Period pursuant to
Sections 3.1 and 3.2, respectively, without the consent of the Registered Holders.

 

9.9 Severability.
This Agreement shall be deemed severable, and the invalidity or unenforceability of any term or provision hereof shall not affect
the validity or enforceability of this Agreement or of any other term or provision hereof. Furthermore, in lieu of any such invalid
or unenforceable term or provision, the parties hereto intend that there shall be added as a part of this Agreement a provision
as similar in terms to such invalid or unenforceable provision as may be possible and be valid and enforceable.

 

Exhibit A Form of Warrant Certificate

Exhibit B Legend — Private Placement Warrants

 

    	 	21	 

    	 	 

    

 

IN WITNESS WHEREOF, the parties hereto have
caused this Agreement to be duly executed as of the date first above written.

 

	 	FIRSTMARK HORIZON ACQUISITION CORP.
	 	 	 
	 	By:	                                
	 	 	Name:
	 	 	Title:
	 	 	 
	 	CONTINENTAL STOCK TRANSFER & TRUST COMPANY, as Warrant Agent
	 	 	 
	 	By:	 
	 	 	Name:
	 	 	Title:

 

[Signature Page to Warrant Agreement]

 

    	 	 	 

    	 	 

    

 

EXHIBIT A

 

[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

 

FirstMark Horizon Acquisition Corp.

Incorporated Under the Laws of the State
of Delaware

		 	

			CUSIP
                                         [•]

 

Warrant Certificate

 

This Warrant Certificate certifies
that             , or registered
assigns, is the registered holder of               warrant(s)
(the “Warrants” and each, a “Warrant”) to purchase shares of Class A common
stock, $0.0001 par value (“Common Stock”), of FirstMark Horizon Acquisition Corp., a Delaware corporation
(the “Company”). Each 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 nonassessable shares of Common Stock as
set forth below, at the exercise price (the “Exercise 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 Exercise 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 share of Common Stock. Fractional shares shall not 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 share of Common Stock, the
Company shall, upon exercise, round down to the nearest whole number the number of shares of Common Stock to be issued to the Warrant
holder. The number of shares of Common Stock 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 Exercise Price per one share
of Common Stock for any Warrant is equal to $11.50 per share. The Exercise 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.

 

	 	FIRSTMARK HORIZON ACQUISITION CORP.
	 	 	 	 
	 	By:	 
	 	 	Name:
	 	 	Title: Authorized Signatory
	 	 	 	 
	 	CONTINENTAL STOCK TRANSFER & TRUST COMPANY, AS WARRANT AGENT
	 	 	 	 
	 	By:	 
	 	 	Name:	 
	 	 	Title:	 

  

    	 	 	 

    	 	 

    

[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
                        shares of Common Stock and are issued or to be issued pursuant to a Warrant Agreement dated as of                , 2020 (the “Warrant
Agreement”), duly executed and delivered by the Company to Continental Stock Transfer & Trust Company, a New
York corporation, 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 Exercise 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 the shares of Common Stock to be issued upon exercise is effective under the Securities Act and (ii) a prospectus
thereunder relating to the shares of Common Stock 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 shares of Common Stock 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 share of Common Stock, the Company shall, upon exercise, round down to the nearest whole number
of shares of Common Stock 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 stockholder 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              
shares of Common Stock and herewith tenders payment for such shares of Common Stock to the order of FirstMark Horizon Acquisition
Corp. (the “Company”) in the amount of $        
in accordance with the terms hereof. The undersigned requests that a certificate for such shares of Common Stock be registered
in the name of                  ,
whose address is           and that such shares of Common Stock be delivered
to               whose address is                 .
If said number of shares of Common Stock is less than all of the shares of Common Stock purchasable hereunder, the undersigned
requests that a new Warrant Certificate representing the remaining balance of such shares of Common Stock 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 shares of Common Stock 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 shares of Common Stock 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 shares of Common Stock
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 of shares of Common Stock 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 shares of
Common Stock. If said number of shares of Common Stock is less than all of the shares of Common Stock purchasable hereunder (after
giving effect to the cashless exercise), the undersigned requests that a new Warrant Certificate representing the remaining balance
of such shares of Common Stock be registered in the name of                   ,
whose address is                   and that such Warrant
Certificate be delivered to                , whose address
is                   .

 

[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).

 

    	 	 	 

    	 	 

    

 

EXHIBIT B

 

LEGEND

 

THE SECURITIES REPRESENTED BY THIS CERTIFICATE
HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR ANY STATE SECURITIES LAWS, AND MAY NOT BE OFFERED, SOLD,
TRANSFERRED OR OTHERWISE DISPOSED OF UNLESS REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND ANY APPLICABLE STATE SECURITIES
LAWS OR AN EXEMPTION FROM REGISTRATION IS AVAILABLE. IN ADDITION, SUBJECT TO ANY ADDITIONAL LIMITATIONS ON TRANSFER DESCRIBED IN
THE LETTER AGREEMENT BY AND AMONG FIRSTMARK HORIZON ACQUISITION CORP. (THE “COMPANY”), FIRSTMARK HORIZON SPONSOR LLC
AND THE OTHER PARTIES THERETO, THE SECURITIES REPRESENTED BY THIS CERTIFICATE MAY NOT BE SOLD OR TRANSFERRED PRIOR TO THE DATE
THAT IS THIRTY (30) DAYS AFTER THE DATE UPON WHICH THE COMPANY COMPLETES ITS INITIAL BUSINESS COMBINATION (AS DEFINED IN THE RECITALS
OF THE WARRANT AGREEMENT REFERRED TO HEREIN) EXCEPT TO A PERMITTED TRANSFEREE (AS DEFINED IN SECTION 2 OF THE WARRANT AGREEMENT)
WHO AGREES IN WRITING WITH THE COMPANY TO BE SUBJECT TO SUCH TRANSFER PROVISIONS.

 

SECURITIES EVIDENCED BY THIS CERTIFICATE
AND SHARES OF CLASS A COMMON STOCK OF THE COMPANY ISSUED UPON EXERCISE OF SUCH SECURITIES SHALL BE ENTITLED TO REGISTRATION RIGHTS
UNDER A REGISTRATION RIGHTS AGREEMENT TO BE EXECUTED BY THE COMPANY.

 

NO.           WARRANT

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