Exhibit 10.4


 


SPONSOR
SUPPORT AGREEMENT


 


This SPONSOR SUPPORT AGREEMENT (this “Agreement”),
dated as of December 10, 2020, is entered into by and among Forum Investors III LLC, a Delaware limited liability company (the
“Sponsor Holdco”, the Persons set forth on Schedule I hereto (together with the Sponsor Holdco,
each a “Sponsor” and, together, the “Sponsors”), Forum Merger III Corporation,
a Delaware corporation (“Parent”), and Electric Last Mile, Inc., a Delaware corporation (the “Company”
and together with the Sponsors and Parent, each a “Party” and collectively, the “Parties”).
Capitalized terms used herein and not otherwise defined shall have the meaning ascribed to them in the Agreement and Plan of Merger,
dated as of December 10, 2020 (as amended, supplemented or otherwise modified from time to time, the “Merger Agreement”),
by and among the Company, Parent, ELMS Merger Corp., a Delaware corporation (“Merger Sub”), and Jason
Luo, in the capacity as the initial Stockholder Representative thereto in accordance with the terms and conditions of the Merger
Agreement.


 


RECITALS


 


WHEREAS,
as of the date of this Agreement, the Sponsors are the record holders and the beneficial (as such term is defined in Rule 13d-3
under the Exchange Act, which meaning shall apply for all purposes of this Agreement whenever the term “beneficial”
or “beneficially” is used) owners of 616,250 Parent Class A Common Stock, 6,250,000 Parent Class B Common Stock and
205,416 Warrants in the aggregate as set forth on Schedule I attached hereto;


 


WHEREAS,
the Company, Parent and Merger Sub have entered into the Merger Agreement, which provides for the merger of Merger Sub with and
into the Company (the “Merger”), with the Company surviving the Merger, pursuant to the provisions of
the DGCL; and


 


WHEREAS,
as an inducement to Parent and the Company to enter into the Merger Agreement and to consummate the transactions contemplated
therein, the Parties hereto desire to agree to certain matters as set forth herein.


 


NOW,
THEREFORE, in consideration of the foregoing premises and the representations, warranties, covenants and agreements set forth
in this Agreement, the Parties agree as follows:


 


Article
1



VOTING AND TRANSFER OF SHARES


 


Section 1.01. Binding Effect of Merger Agreement. Each
Sponsor hereby acknowledges that he, she or it has read the Merger Agreement and this Agreement and has had the opportunity to
consult with his, her or its tax and legal advisors. Each Sponsor shall be bound by and comply with Sections 5.15 (Exclusivity)
and 5.16 (Publicity) of the Merger Agreement (and any relevant definitions contained in any such Sections) as if such Sponsor
was an original signatory to the Merger Agreement with respect to such provisions.


 






    


     


    

 


Section
1.02. Voting.


 


(a)
Each Sponsor irrevocably and unconditionally agrees, during the period beginning on the date of this Agreement and ending on the
Expiration Date (the “Applicable Period”), at each meeting of the stockholders of Parent (a “Meeting”)
and at each adjournment or postponement thereof, and in connection with each action or approval by consent in writing of the stockholders
of Parent (a “Consent Solicitation”), to cause to be present in person or represented by proxy and to
vote or cause to be voted (or express consent or dissent in writing, as applicable) all of his, her or its shares of Parent Common
Stock that are entitled to vote (or express consent or dissent in writing, as applicable), in each case as follows:


 


(i)
in favor of any proposal for stockholders of Parent to adopt the Merger Agreement and approve any other matters necessary for
consummation of the transactions contemplated by the Merger Agreement, including the Merger;


 


(ii)
in favor of any proposal to adjourn a Meeting at which there is a proposal for stockholders of Parent to adopt the Merger Agreement
to a later date if there are not sufficient votes to adopt the Merger Agreement or if there are not sufficient shares of Parent
Common Stock present in person or represented by proxy at such Meeting to constitute a quorum;


 


(iii)
against any proposal providing for a Business Combination Transaction or the adoption of an agreement to enter into a Business
Combination Transaction;


 


(iv)
against any merger agreement or merger (other than the Merger Agreement and the Merger), consolidation, combination, sale of substantial
assets, reorganization, recapitalization, dissolution, liquidation or winding up of or by Parent;


 


(v)
against any change in the business, management or Board of Directors of Parent; and


 


(vi) against any action, transaction or agreement that (A) would
result in a breach of any representation or warranty or covenant of Parent or the Merger Sub under the Merger Agreement; (B) would
reasonably be expected to prevent, delay or impair consummation of the Transactions in any material respect; (C) result in any
of the conditions set forth in Article VI of the Merger Agreement not being fulfilled or (D) change in any manner the dividend
policy or capitalization of, including the voting rights of any class of capital stock of, Parent.


 


(b)
Any vote required to be cast or consent or dissent in writing required to be expressed pursuant to this Section 1.02 shall
be cast or expressed in accordance with the applicable procedures relating thereto so as to ensure that it is duly counted for
purposes of determining that a quorum is present (if applicable) and for purposes of recording the results of that vote or Consent
Solicitation. For the avoidance of doubt, nothing contained herein requires a Sponsor (or entitles any proxy of the Sponsor) to
convert, exercise or exchange any options, warrants or convertible securities in order to obtain any underlying shares of Parent
Common Stock.


 






    2


     


    

 


(c)
Each Sponsor agrees not to enter into any commitment, agreement, understanding or similar arrangement with any Person to vote
or give voting instructions or express consent or dissent in writing in any manner inconsistent with the terms of this Section
1.02.


 


(d)
Each Sponsor shall comply with, and fully perform all of its obligations, covenants and agreements set forth in, that certain
Letter Agreement, dated as of August 18, 2020, by and among the Sponsors, Parent and other parties thereto (the “Letter
Agreement”), including the obligations of the Sponsors pursuant to Section 1 therein to not redeem any shares of
Parent Common Stock owned by such Sponsor in connection with the transactions contemplated by the Merger Agreement.


 


Section
1.03. No Transfers. During the Applicable Period, each Sponsor shall not, directly or indirectly: (a) sell, convey, assign,
transfer (including by succession or otherwise by operation of Law), exchange, pledge, hypothecate or otherwise encumber or dispose
of any shares of Parent Common Stock or Warrants (or any right, title or interest therein) or any rights to acquire any securities
or equity interests of Parent; (b) deposit any shares of Parent Common Stock or Warrants or any rights to acquire any securities
or equity interests of Parent into a voting trust or enter into a voting agreement or any other arrangement with respect to any
shares of Parent Common Stock or Warrants or any rights to acquire any securities or equity interests of Parent or grant or purport
to grant any proxy or power of attorney with respect thereto; (c) enter into any contract, option, call or other arrangement or
undertaking, whether or not in writing, with respect to the sale, conveyance, assignment, transfer (including by succession or
otherwise by operation of Law), exchange, pledge, hypothecation or other encumbrance or disposition, or limitation on the voting
rights, of any shares of Parent Common Stock or Warrants (or any right, title or interest therein) or any rights to acquire any
securities or equity interests of Parent; (d) otherwise grant, permit or suffer the creation of any Liens on any shares of Parent
Common Stock or Warrants (other than applicable restrictions on transfer under U.S. state or federal securities or “blue
sky” Laws) or (e) commit or agree to take any of the foregoing actions (any action described in clauses (a), (b), (c), (d)
and (e), a “Transfer”); provided, however, that the foregoing shall not prohibit Transfers
between such Sponsor and any Affiliate of such Sponsor so long as, prior to and as a condition to the effectiveness of any such
Transfer, such Affiliate or transferee executes and delivers to Parent and the Company a joinder to this Agreement in the form
attached hereto as Annex A. Any Transfer or action in violation of this Section 1.03 shall be void ab
initio. If any involuntary Transfer of any shares of Parent Common Stock or Warrants occurs, the transferee (and all transferees
and subsequent transferees of such transferee) shall take and hold such shares of Parent Common Stock or Warrants subject to all
of the restrictions, liabilities and rights under this Agreement, which shall continue in full force and effect during the Applicable
Period.


 


Section
1.04. Stop Transfer. No Sponsor shall request that Parent register any transfer of any Certificate or other uncertificated
interest representing any shares of Parent Common Stock or Warrants made in violation of the restrictions set forth in Section
1.03 during the Applicable Period.


 


Section
1.05. Waiver of Appraisal Rights. Each Sponsor hereby agrees not to assert, exercise or perfect, directly or indirectly,
and irrevocably and unconditionally waives, any appraisal rights (including under Section 262 of the DGCL) with respect to the
Merger and any rights to dissent with respect to the Merger (collectively, “Appraisal Rights”).


 






    3


     


    

 


Section
1.06. No Agreement as Director or Officer. Each Sponsor is entering into this Agreement solely in such Sponsor’s
capacity as record or beneficial owner of shares of Parent Common Stock or Warrants and nothing herein is intended to or shall
limit or affect any actions taken by such Sponsor or any employee, officer, director (or person performing similar functions),
partner or other Affiliate (including, for this purpose, any appointee or representative of such Sponsor to the board of directors
of Parent) of such Sponsor, solely in his or her capacity as a director or officer of Parent (or a Subsidiary of Parent) or other
fiduciary capacity for Parent’s stockholders.


 


Section
1.07. New Shares. In the event that (a) any shares of Parent Common Stock, Warrants or other equity securities of Parent
are issued to a Sponsor after the date of this Agreement pursuant to any stock dividend, stock split, recapitalization, reclassification,
combination or exchange of shares of Parent Common Stock or Warrants of, on or affecting the shares of Parent Common Stock or
Warrants owned by such Sponsor or otherwise, (b) a Sponsor purchases or otherwise acquires beneficial ownership of any shares
of Parent Common Stock, Warrants or other equity securities of Parent after the date of this Agreement, or (c) a Sponsor acquires
the right to vote or share in the voting of any shares of Parent Common Stock or other equity securities of Parent after the date
of this Agreement (such shares of Parent Common Stock, Warrants or other equity securities of Parent, collectively the “New
Securities”), then such New Securities acquired or purchased by such Sponsor shall be subject to the terms of this
Agreement to the same extent as if they constituted the shares of Parent Common Stock or Warrants owned by such Sponsor as of
the date hereof.


 


Section
1.08. No Litigation. Each Sponsor hereby agrees not to commence, maintain or participate in, or facilitate, assist or encourage,
and agrees to take all actions necessary to opt out of any class in any class action with respect to, any claim, derivative or
otherwise, suit, proceeding or cause of action, in law or in equity, in any court or before any Governmental Entity (a) challenging
the validity of, or seeking to enjoin or delay the operation of, any provision of this Agreement or the Merger Agreement (including
any claim seeking to enjoin or delay the consummation of the Merger), (b) alleging a breach of any fiduciary duty of any Person
in connection with the Merger Agreement or the Transactions or (c) seeking Appraisal Rights in connection with the Merger. Notwithstanding
the foregoing, nothing herein shall be deemed to prohibit a Sponsor from enforcing such Sponsor’s rights under this Agreement.


 


Section
1.09. Further Assurances. Each Sponsor shall execute and deliver, or cause to be executed and delivered, such further certificates,
instruments and other documents and to take such further actions as Parent or the Company may reasonably request for the purpose
of effectively carrying out the transactions contemplated by this Agreement.


 






    4


     


    

 


Article
2



REPRESENTATIONS AND WARRANTIES OF THE SPONSORS


 


Each
Sponsor hereby represents and warrants to Parent and the Company (solely with respect to itself, himself or herself and not with
respect to any other Sponsor) as follows:


 


Section
2.01. Organization; Authorization. In the event a Sponsor is an individual, such Sponsor has full power, right and legal
capacity to execute and deliver this Agreement and to perform his or her obligations hereunder. In the event a Sponsor is a legal
entity, (a) such Sponsor is a legal entity duly organized, validly existing and in good standing under the Laws of such Sponsor’s
jurisdiction of organization, (b) such Sponsor has all requisite corporate or similar power and authority and has taken all corporate
or similar action necessary in order to execute and deliver this Agreement, to perform such Sponsor’s obligations under
this Agreement and to consummate the transactions contemplated by this Agreement, and (c) no approval by any holder of such Sponsor’s
equity interests is necessary to approve this Agreement. This Agreement has been duly executed and delivered by such Sponsor and,
in the event such Sponsor is an individual and is married and any of such Sponsor’s shares of Parent Common Stock or Warrants
constitute community property or spousal approval is otherwise required in order for this Agreement to be a valid and binding
obligation of such Sponsor, this Agreement has been duly executed and delivered by or on behalf of such Sponsor’s spouse,
and this Agreement constitutes a valid and binding agreement of such Sponsor enforceable against such Sponsor in accordance with
its terms, subject to the Bankruptcy and Equity Exception.


 


Section
2.02. Governmental Filings; No Violations; Certain Contracts.


 


(a)
Except for filings with the SEC under the Exchange Act and such other reports under, and such other compliance with, the Exchange
Act as may be required in connection with this Agreement, no filings, notices, reports, consents, registrations, approvals, permits
or authorizations are required to be made by such Sponsor with, nor are any required to be made or obtained by such Sponsor with
or from any Governmental Entity, in connection with the execution, delivery and performance of this Agreement by such Sponsor
and the consummation of the transactions contemplated by this Agreement, except as would not, individually or in the aggregate,
reasonably be expected to prevent, delay or impair the ability of such Sponsor to perform such Sponsor’s obligations under
this Agreement or to consummate the transactions contemplated by this Agreement.


 


(b)
The execution, delivery and performance of this Agreement by such Sponsor does not, and the consummation of the transactions contemplated
by this Agreement by such Sponsor shall not, constitute or result in (i) a breach or violation of, or a default under, the Organizational
Documents of such Sponsor, if applicable or (ii) with or without notice, lapse of time or both, a breach or violation of, a termination
(or right of termination) of or default under, the creation or acceleration of any obligations under or the creation of an Encumbrance
on any of the assets of such Sponsor pursuant to, any Contract binding upon such Sponsor or, assuming (solely with respect to
performance of this Agreement and consummation of the transactions contemplated by this Agreement) compliance with the matters
referred to in Section 2.02(a), under any Law to which such Sponsor is subject, except, in each case, as would not, individually
or in the aggregate, reasonably be expected to prevent, delay or impair the ability of such Sponsor to perform his, her or its
obligations under this Agreement or consummate the transactions contemplated by this Agreement.


 






    5


     


    

 


Section
2.03. Litigation. As of the date of this Agreement, except as would not, individually or in the aggregate, reasonably be
expected to prevent, delay or impair the ability of such Sponsor to perform his, her or its obligations under this Agreement or
to consummate the transactions contemplated by this Agreement, (a) there are no Actions pending or, to the knowledge of such Sponsor,
threatened against such Sponsor or any of its Affiliates and (b) neither such Sponsor nor any of its Affiliates is a party to
or subject to the provisions of any judgment, order, writ, injunction, decree or award of any Governmental Entity.


 


Section
2.04. Ownership of Parent Common Stock and Warrants; Voting Power. Schedule I hereto correctly sets forth the number of
shares such Sponsor’s shares of Parent Common Stock and Warrants as of the date of this Agreement and, other than such shares
of Parent Common Stock and Warrants, as of the date of this Agreement, there are no Parent securities (or any securities convertible,
exercisable or exchangeable for, or rights to purchase or acquire, any Parent securities) held of record or beneficially owned
by such Sponsor or in respect of which such Sponsor has full voting power. Such Sponsor is the record holder and beneficial owner
of all of his, her or its shares of Parent Common Stock and Warrants and has, and shall have throughout the Applicable Period,
full voting power and power of disposition with respect to all such shares of Parent Common Stock and Warrants free and clear
of any liens, claims, proxies, voting trusts or agreements, options or any other encumbrances or restrictions on title, transfer
or exercise of any rights of a stockholder in respect of such shares of Parent Common Stock and Warrants (collectively, “Encumbrances”),
except for any such Encumbrance that (a) may be imposed pursuant to (i) this Agreement, (ii) any applicable restrictions on transfer
under U.S. state or federal securities or “blue sky” Laws, or (iii) the Parent’s Organizational Documents or
the terms of any customary custody or similar agreement applicable to shares of Parent Common Stock or Warrants held in brokerage
accounts or (b) would not, individually or in the aggregate, reasonably be expected to prevent, delay or impair the ability of
such Sponsor to perform his, her or its obligations under this Agreement or to consummate the transactions contemplated by this
Agreement. No Person has any contractual or other right or obligation to purchase or otherwise acquire any of such Sponsor’s
shares of Parent Common Stock or Warrants other than pursuant to the Merger Agreement or as set forth in Parent’s Organizational
Documents.


 


Section
2.05. Reliance. Each Sponsor understands and acknowledges that Parent and the Company are relying upon such Sponsor’s
execution, delivery and performance of this Agreement and upon the representations and warranties and covenants of such Sponsor
contained in this Agreement.


 


Section
2.06. Finder’s Fees. No agent, broker, investment banker, finder or other intermediary is or shall be entitled to
any fee or commission or reimbursement of expenses from Parent, Merger Sub or the Company or any of their respective Affiliates
in respect of this Agreement based upon any arrangement or agreement made by or on behalf of such Sponsor.


 






    6


     


    

 


Section
2.07. Affiliate Arrangements. Except as set forth on Schedule II attached hereto, neither such Sponsor nor anyone related
by blood, marriage or adoption to such Sponsor or, to the knowledge of such Sponsor, any Person in which such Sponsor has a direct
or indirect legal, contractual or beneficial ownership of 5% or greater is party to, or has any rights with respect to or arising
from, any Contract with Parent or its Subsidiaries.


 


Section
2.08. No Other Representations or Warranties. Except for the representations and warranties made by such Sponsor in this
Article 2, neither such Sponsor nor any other Person makes any express or implied representation or warranty to Parent
or the Company in connection with this Agreement or the transactions contemplated by this Agreement, and such Sponsor expressly
disclaims any such other representations or warranties.


 


Article
3



REPRESENTATIONS AND WARRANTIES OF PARENT


 


Parent
represents and warrants to each Sponsor as follows:


 


Section
3.01. Organization. Parent is a corporation duly organized, validly existing and in good standing under the Laws of Delaware.


 


Section
3.02. Corporate Authority. Parent has all requisite corporate power and authority and has taken all corporate or similar
action necessary in order to execute and deliver this Agreement, to perform its obligations under this Agreement and to consummate
the transactions contemplated by this Agreement. No approval by any holder of Parent’s equity interests is necessary to
approve this Agreement. This Agreement has been duly executed and delivered by Parent and constitutes a valid and binding agreement
of Parent enforceable against Parent in accordance with its terms, subject to the Bankruptcy and Equity Exception.


 


Section
3.03. No Other Representations or Warranties. Except for the representations and warranties made by Parent in this Article
3, neither Parent nor any other Person makes any express or implied representation or warranty to such Sponsor in connection
with this Agreement or the transactions contemplated by this Agreement, and Parent expressly disclaims any such other representations
or warranties.


 


Article
4



REPRESENTATIONS AND WARRANTIES OF THE COMPANY


 


The
Company represents and warrants to each Sponsor as follows:


 


Section
4.01. Organization. The Company is a corporation duly organized, validly existing and in good standing under the Laws of
Delaware.


 






    7


     


    

 


Section
4.02. Corporate Authority. The Company has all requisite corporate power and authority and has taken all corporate or similar
action necessary in order to execute and deliver this Agreement, to perform its obligations under this Agreement and to consummate
the transactions contemplated by this Agreement. No approval by any holder of the Company’s equity interests is necessary
to approve this Agreement. This Agreement has been duly executed and delivered by the Company and constitutes a valid and binding
agreement of the Company enforceable against the Company in accordance with its terms, subject to the Bankruptcy and Equity Exception.


 


Section
4.03. No Other Representations or Warranties. Except for the representations and warranties made by the Company in this
Article 4, neither the Company nor any other Person makes any express or implied representation or warranty to such Sponsor
in connection with this Agreement or the transactions contemplated by this Agreement, and the Company expressly disclaims any
such other representations or warranties.


 


Article
5



GENERAL PROVISIONS


 


Section 5.01. Termination. This Agreement, including
the voting agreements contemplated by this Agreement, shall automatically be terminated at the earliest to occur of: (a) the Effective
Time; (b) the termination of the Merger Agreement pursuant to Article VII thereof; (c) the effective date of a written agreement
duly executed and delivered by Parent, the Company and such Sponsor terminating this Agreement; (d) any amendment or modification
of, or waiver under, the Merger Agreement, in each case without the prior written consent of such Sponsor, in a manner that extends
the Outside Date (the date and time at which the earliest of clause (a), (b), (c), and (d) occurs being, the “Expiration
Date”); provided, however, that in the case of any termination pursuant to clause (a) of this sentence,
Section 1.05 Waiver of Appraisal Rights, Section 1.08 No Litigation and Section 1.09 Further
Assurances and this Article 5 shall survive such termination. Nothing set forth in this Section 5.01 or elsewhere
in this Agreement shall relieve any Party of any liability or damages to any other Party for any breach of this Agreement by such
Party prior to such termination or fraud in connection with, arising out of or otherwise related to the express representations
and warranties set forth in this Agreement or any instrument or other document delivered pursuant to this Agreement.


 


Section
5.02. Notices. All notices, requests, instructions, consents, claims, demands, waivers, approvals and other communications
to be given or made hereunder by a Party to the other Party shall be in writing and shall be deemed to have been duly given or
made on the date of delivery to the recipient thereof if received prior to 5:00 p.m. in the place of delivery and such day is
a Business Day (or otherwise on the next succeeding Business Day) if (a) served by personal delivery or by a nationally recognized
overnight courier service upon the Party for whom it is intended, (b) delivered by registered or certified mail, return receipt
requested or (c) sent by email; provided that email transmission is promptly confirmed by telephone or otherwise. Such
communications shall be sent to the respective Parties at the following street addresses or email addresses or at such other street
address, or email address for a Party as shall be specified for such purpose in a notice given in accordance with this Section
5.02:


 


If
to Parent:


 


Forum
Merger III Corporation


1615
South Congress Avenue


Suite
103


Delray
Beach, FL 33445


Attention:
Marshall Kiev


   David Boris


Email:
mk@mkcapitalpartners.com


     david@forummerger.com


 






    8


     


    

 


with
a copy to (which shall not constitute notice):


 


White
& Case LLP

1221 Avenue of the Americas


New
York, NY 10020

Attention: Joel Rubinstein


   Gary
Silverman


Email:
Joel.Rubinstein@whitecase.com


    Gary.Silverman@whitecase.com


 


If
to the Company:


 


Electric
Last Mile, Inc.


2541
High Meadow Circle


Suite
170


Auburn
Hills, MI 48362


Attention:
Jason Luo, Chairman


Email:
jluo@electriclastmile.com


 


with
a copy to (which shall not constitute notice):


 


Foley
& Lardner LLP

111 Huntington Avenue

Suite 2500


Boston,
MA 02199

Attention: Paul D. Broude


Email:
pbroude@foley.com


 


If
to such Sponsor, to such Sponsor’s address set forth on a signature page hereto.


 


Section
5.03. Miscellaneous. Article IX, other than Sections 9.5, 9.8, 9.13 and 9.14, of the Merger Agreement shall apply to this
Agreement mutatis mutandis.


 


[Signature
Page Follows]


 




    9


     


    


 


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


 





	 	Forum Merger III Corporation
	 	 
	 	By:	/s/ Marshall Kiev 
	 	 	Name: Marshall Kiev
	 	 	Title: Co-CEO and President





 


[Signature
Page to Support Agreement]


 




     


     

    


 


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


 





	 	Electric Last Mile, Inc.
	 	 
	 	By:	/s/ Benjamin Wu 
	 	 	Name: Benjamin Wu
	 	 	Title: Secretary





 


[Signature
Page to Support Agreement]


 




     


     

    


 


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


 


	 	

        FORUM
        INVESTORS III LLC

	 	 
	 	By: 	Forum Capital Management III LLC,  

as managing
member
	 	 
	 	By: 	/s/ David Boris
	 	Name:
	David Boris

	 	Title: 	Managing Member


 


		Address:	c/o
Forum Merger III Corporation,



1615
South Congress Avenue, Suite 103


Delray
Beach, Florida 33445


 


[Signature
Page to Support Agreement]


 




     


     

    


 


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


 


		FORUM CAPITAL MANAGEMENT III LLC
	 	 
	 	By:	/s/ David
    Boris
	 	 	Name: 	David Boris
	 	 	Title:	Managing Member


 


		Address:	c/o
Forum Merger III Corporation,



1615
South Congress Avenue, Suite 103


Delray
Beach, Florida 33445


 


[Signature
Page to Support Agreement]


 




     


     

    


 


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


 


	 	By:	 /s/ Marshall Kiev
	 	 	Name:
    Marshall Kiev


 


 


		Address:	c/o
Forum Merger III Corporation,



1615
South Congress Avenue, Suite 103


Delray
Beach, Florida 33445


 


 


[Signature
Page to Support Agreement]


 




     


     

    


 


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


 





	 	By:	 /s/ David Boris
	 	 	Name:  David Boris


 


		Address:	c/o
Forum Merger III Corporation,



1615
South Congress Avenue, Suite 103


Delray
Beach, Florida 33445


 


[Signature
Page to Support Agreement]


 




     


     

    


 


Schedule
I


 


Sponsor
Parent Common Stock and Warrants


 


	 
Sponsor
	 	Parent Class A Common Stock	 	 	Parent Class B Common Stock	 	 	Warrants	 
	Forum Investors III LLC	 	 	616,250	 	 	 	6,250,000	 	 	 	205,416	 
	Forum Capital Management III LLC	 	 	*	 	 	 	*	 	 	 	*	 
	Marshall Kiev	 	 	*	 	 	 	*	 	 	 	*	 
	David Boris	 	 	*	 	 	 	*	 	 	 	*	 



 


		*	Forum
Capital Management III LLC is the managing member of Forum Investors III LLC and has voting and investment discretion with respect
to the common stock and warrants held by Forum Investors III LLC. Marshall Kiev and David Boris are the managing members of Forum
Capital Management III LLC and may be deemed to have beneficial ownership of the common stock and warrants held directly by Forum
Investors III LLC.



 




    Schedule I-1


     


    


 


Schedule
II


 


Affiliate
Agreements


 


Letter
Agreement, dated August 18, 2020, by and among Forum Merger III Corporation, each of Forum Merger III Corporation’s officers
and directors and Forum Investors III LLC


 


Amended
and Restated Promissory Note, dated July 2, 2020, issued to Forum Investors III LLC


 


Investment
Management Trust Agreement, dated August 18, 2020, between Continental Stock Transfer & Trust Company and Forum Merger III
Corporation


 


Registration
Rights Agreement, dated August 18, 2020, among Forum Merger III Corporation, Forum Investors III LLC and the Holders signatory
thereto


 


Securities
Subscription Agreement, dated June 26, 2019, between Forum Merger III Corporation and Forum Investors III LLC


 


Private
Placement Units Purchase Agreement, dated August 18, 2020, between Forum Merger III Corporation and Forum Investors III LLC


 


Administrative
Services Agreement, dated August 18, 2020, between Forum Merger III Corporation and Forum Capital Management III LLC


 


Indemnity
Agreements, each dated August 18, 2020, between Forum Merger III Corporation and each of the officers and directors of Forum Merger
III Corporation


 


Warrant
Agreement, dated August 18, 2020, between Continental Stock Transfer & Trust Company and Forum Merger III Corporation


 




    Schedule II-1


     


    


 


Annex
A


 


FORM
OF JOINDER


 


This Joinder Agreement (this “Joinder Agreement”)
is made as of the date written below by the undersigned (the “Joining Party”) in accordance with the
Sponsor Support Agreement dated as of December 10, 2020 (the “Sponsor Support Agreement”) by
and among Parent, the Company and the Sponsors that are party thereto as the same may be amended, supplemented or otherwise modified
from time to time. Capitalized terms used herein and not otherwise defined shall have the meaning ascribed to them in the Sponsor
Support Agreement.


 


The
Joining Party hereby acknowledges, agrees and confirms that, by its execution of this Joinder Agreement, the Joining Party shall
be deemed to be a party to, and a “Sponsor” under, the Sponsor Support Agreement as of the date hereof and shall have
all of the rights and obligations of a Sponsor as if he, she or it had executed the Sponsor Support Agreement. The Joining Party
hereby ratifies, as of the date hereof, and agrees to be bound by, all of the terms, provisions and conditions contained in the
Sponsor Support Agreement.


 


IN
WITNESS WHEREOF, the undersigned has duly executed this Joinder Agreement as of the date written below.


 


Date: [●]
[●], 20[●]


 


	 	By:	 
	 	 	Name:
	 	 	Title:
	 	 	Address for Notices:
	 	 	 
	 	 	With copies to:


 


 


Annex A-1