Document:

Exhibit
10.3

 

FORM
OF STOCKHOLDER SUPPORT AGREEMENT

 

This
Stockholder Support Agreement (this “Agreement”) is dated as of February [__], 2021, by and among NextGen Acquisition
Corporation, a Cayman Islands exempted company limited by shares (which shall domesticate as a Delaware corporation prior to the
Closing (as defined in the Merger Agreement (as defined below)) (“Acquiror”), the Persons set forth on Schedule
I hereto (each, a “Company Stockholder”, and collectively, the “Company Stockholders”),
and Xos, Inc., a Delaware corporation (the “Company”). Capitalized terms used but not defined herein shall
have the respective meanings ascribed to such terms in the Merger Agreement.

 

RECITALS

 

WHEREAS,
as of the date hereof, the Company Stockholders are the holders of record and the “beneficial owners” (within the
meaning of Rule 13d-3 under the Exchange Act) of such number of shares of such classes or series of Company Capital Stock as are
indicated opposite each such Company Stockholder’s name on Schedule I hereto (all such shares of Company Capital
Stock, together with (i) any shares of Company Capital Stock of which ownership of record or the power to vote (including, without
limitation, by proxy or power of attorney) is hereafter acquired by any such Company Stockholder during the period from the date
hereof through the Expiration Time and (ii) securities convertible into Company Capital Stock (including the Company Warrant)
of which ownership of record or the power to vote (including, without limitation, by proxy or power of attorney) is hereafter
acquired by any such Company Stockholder during the period from the date hereof through the Expiration Time are referred to herein
as the “Subject Shares”);

 

WHEREAS,
contemporaneously with the execution and delivery of this Agreement, Acquiror, Sky Merger Sub I, Inc., a Delaware corporation
and a direct wholly owned subsidiary of Acquiror (“Merger Sub”), and the Company, have entered into an Agreement
and Plan of Merger (as amended or modified from time to time, the “Merger Agreement”), dated as of the date
hereof, pursuant to which, among other transactions, Merger Sub will merge with and into the Company, with the Company continuing
on as the surviving corporation and a wholly owned subsidiary of Acquiror, on the terms and conditions set forth therein (the
“Merger”); and

 

WHEREAS,
as an inducement to Acquiror 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.

 

AGREEMENT

 

NOW,
THEREFORE, in consideration of the foregoing and the mutual agreements contained herein, and intending to be legally bound hereby,
the parties hereto hereby agree as follows:

 

     

     

    

 

ARTICLE
I

STOCKHOLDER SUPPORT AGREEMENT; COVENANTS

 

Section
1.1 Binding Effect of Merger Agreement. Each Company Stockholder hereby acknowledges that it has read the Merger Agreement
and this Agreement and has had the opportunity to consult with its tax and legal advisors. Each Company Stockholder shall be bound
by and comply with Sections 6.6 (Acquisition Proposals) and 11.12 (Publicity) of the Merger Agreement (and any relevant
definitions contained in any such Sections) as if (a) such Company Stockholder was an original signatory to the Merger Agreement
with respect to such provisions, and (b) each reference to the “Company” contained in Section 6.6 of the Merger Agreement
(other than Section 6.6(a), the last sentence of Section 6.6, or for purposes of the definition of Acquisition Proposal) also
referred to each such Company Stockholder.

 

Section
1.2 No Transfer. During the period commencing on the date hereof and ending on the earlier of (a) the Effective Time and
(b) such date and time as the Merger Agreement shall be terminated in accordance with Section 10.1 thereof (the earlier of clauses
(a) and (b), the “Expiration Time”), each Company Stockholder shall not (i) sell, offer to sell, contract or
agree to sell, hypothecate, pledge, grant any option to purchase or otherwise dispose of or agree to dispose of, directly or indirectly,
file (or participate in the filing of) a registration statement with the SEC (other than the Proxy Statement/Registration Statement)
or establish or increase a put equivalent position or liquidate or decrease a call equivalent position within the meaning of Section
16 of the Exchange Act, with respect to any Subject Shares, (ii) enter into any swap or other arrangement that transfers to another,
in whole or in part, any of the economic consequences of ownership of any Subject Shares (clauses (i) and (ii) collectively, a
“Transfer”) or (iii) publicly announce any intention to effect any transaction specified in clause (i) or (ii);
provided, however, that the foregoing shall not prohibit Transfers between the Company Stockholder and any Affiliate
of the Company Stockholder, so long as, prior to and as a condition to the effectiveness of any such Transfer, such Affiliate
executes and delivers to Acquiror a joinder to this Agreement in substantially the form attached hereto as Annex A; provided,
further, that any Transfer permitted under this Section 1.2 shall not relieve a Company Stockholder of its obligations
under this Agreement. Any Transfer in violation of this Section 1.2 with respect to a Company Stockholder’s Subject
Shares shall be null and void.

 

Section
1.3 New Shares. In the event that after the date hereof but prior to the Expiration Time (a) any Subject Shares are issued
to a Company Stockholder pursuant to any stock dividend, stock split, recapitalization, reclassification, combination or exchange
of Subject Shares or otherwise, (b) a Company Stockholder purchases or otherwise acquires beneficial ownership of any Subject
Shares, or (c) a Company Stockholder acquires the right to vote or share in the voting of any Subject Shares (collectively, the
“New Securities”), then such New Securities acquired or purchased by such Company Stockholder shall be subject
to the terms of this Agreement to the same extent as if they constituted the Subject Shares owned by such Company Stockholder
as of the date hereof.

 

    2

     

    

 

Section
1.4 Company Stockholder Agreements.

 

(a)
Hereafter until the Expiration Time, each Company Stockholder hereby unconditionally and irrevocably agrees that, at any
meeting of the stockholders of the Company (or any adjournment or postponement thereof), and in any action by written consent
of the stockholders of the Company distributed by the Board of Directors of the Company or otherwise undertaken in respect of
or as contemplated by the Merger Agreement or the transactions contemplated thereby in a form reasonably acceptable to
Acquiror (which written consent shall be delivered promptly, and in any event within two (2) Business Days, after the
Registration Statement (as contemplated by the Merger Agreement)) is declared effective under the Securities Act and
delivered or otherwise made available to stockholders of the Company, such Company Stockholder shall, if a meeting is held,
appear at the meeting, in person or by proxy, or otherwise cause its Subject Shares (to the extent such Subject Shares are
entitled to vote on or provide consent with respect to such matter) to be counted as present thereat for purposes of
establishing a quorum, and such Company Stockholder shall vote or provide consent (or cause to be voted or consent provided),
in person or by proxy, all of its Subject Shares (to the extent such Subject Shares are entitled to vote on or provide
consent with respect to such matter):

 

(i) to approve and adopt the Merger Agreement and the transactions contemplated thereby, including the Merger;

 

(ii)
to the extent necessary, to approve and adopt the Closing Recapitalization and the transactions contemplated thereby;

 

(iii)
to exercise the drag-along rights, if applicable to the Merger, set forth in Section 4 of the Voting Agreement (as defined below);

 

(iv)
in any other circumstances upon which a consent, waiver or other approval is required under the Company’s Governing Documents
or under any agreements between the Company and its stockholders or otherwise sought with respect to the Merger Agreement or the
transactions contemplated thereby, to vote, consent, waive or approve (or cause to be voted, consented, waived or approved) all
of such Company Stockholder’s Subject Shares held at such time in favor thereof (to the extent such Subject Shares are entitled
to vote on or provide consent, waiver or approval with respect to such matter);

 

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

 

(vi)
against any change in the business, management or board of directors of the Company that would or would reasonably be expected
to adversely affect the ability of the Company to consummate the transactions contemplated by the Merger Agreement, including
the Merger; and

 

(vii)
against any proposal, action or agreement that would (A) impede, frustrate, prevent or nullify any provision of this Agreement,
the Merger Agreement or the transactions contemplated thereby, including the Merger, (B) result in a breach in any respect of
any covenant, representation, warranty or any other obligation or agreement of the Company under the Merger Agreement or (C) result
in any of the conditions set forth in Article IX 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 or securities convertible into capital
stock of, the Company.

 

    3

     

    

 

Each
Company Stockholder hereby agrees that it shall not commit or agree to take any action inconsistent with the foregoing.

 

Section
1.5 Affiliate Agreements. Each Company Stockholder, severally and not jointly, hereby agrees and consents to the termination
of all Affiliate Arrangements to which such Company Stockholder is party, effective as of the Effective Time without any further
liability or obligation to the Company, the Company’s Subsidiaries or Acquiror, including those certain agreements set forth
on Schedule II hereto, as applicable.

 

Section
1.6 Registration Rights Agreement. Each of the Company Stockholders set forth on Schedule III, on behalf of itself,
agrees that it will deliver, substantially simultaneously with the Effective Time, a duly executed copy of the Amended and Restated
Registration Rights Agreement substantially in the form attached as Exhibit C to the Merger Agreement.

 

Section
1.7 Lock-Up Agreement. Each of the Company Stockholders set forth on Schedule IV, on behalf of itself, agrees that
it will deliver, substantially simultaneously with the Effective Time, a duly executed copy of the Lock-Up Agreement substantially
in the form attached as Exhibit D to the Merger Agreement.

 

Section
1.8 Company Preferred Stock; Company Warrant. Each of the Company Stockholders and the Company hereby agree and acknowledge
that (a) immediately prior to the Effective Time, subject to the occurrence of the Merger and without any action on the part of
any Company Stockholder or the Company, the Company Warrant will be exercised in full pursuant to Section 3.4 of the Warrant Agreement
and (b) at the Effective Time (but prior to the conversion of securities in accordance with Section 3.1 of the Merger Agreement),
subject to the occurrence of the Merger and without any action on the part of any Company Stockholder or the Company, each share
of the Company Preferred Stock will be converted into one share of Company Common Stock pursuant to Article IV, Part B, Section
4(b)(i)(b) of the Restated Certificate of Incorporation of the Company.

 

Section
1.9 Further Assurances. Each Company Stockholder shall execute and deliver, or cause to be delivered, such additional documents,
and take, or cause to be taken, all such further actions and do, or cause to be done, all things reasonably necessary (including
under applicable Laws), or reasonably requested by Acquiror or the Company, to consummate the Merger and the other transactions
contemplated by the Merger Agreement and this Agreement, in each case, on the terms and subject to the conditions set forth therein
and herein, as applicable.

 

Section
1.10 No Inconsistent Agreement. Each Company Stockholder hereby represents and covenants that such Company Stockholder
has not entered into, and shall not enter into, any agreement that would restrict, limit or interfere with the performance of
such Company Stockholder’s obligations hereunder.

 

Section
1.11 No Challenges. Each Company Stockholder agrees not to commence, join in, 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,
against Acquiror, Merger Sub, the Company or any of their respective successors, assigns or directors, (a) challenging the validity
of, or seeking to enjoin the operation of, any provision of this Agreement or (b) alleging a breach of any fiduciary duty of any
Person in connection with the evaluation, negotiation or entry into the Merger Agreement. Notwithstanding the foregoing, nothing
herein shall be deemed to prohibit such Company Stockholder from enforcing such Company Stockholder’s rights under this
Agreement and the other agreements entered into by such Company Stockholder in connection herewith, including such Company Stockholder’s
right to receive such Company Stockholder’s portion of the Aggregate Merger Consideration as provided in the Merger Agreement.

 

    4

     

    

 

Section
1.12 Consent to Disclosure. Each Company Stockholder hereby consents to the publication and disclosure in the Proxy Statement/Registration
Statement (and, as and to the extent otherwise required by applicable securities Laws or the SEC or any other securities authorities,
any other documents or communications provided by Acquiror or the Company to any Governmental Authority or to securityholders
of Acquiror) of such Company Stockholder’s identity and beneficial ownership of Subject Shares and the nature of such Company
Stockholder’s commitments, arrangements and understandings under and relating to this Agreement and, if deemed appropriate
by Acquiror or the Company, a copy of this Agreement. Each Company Stockholder will promptly provide any information reasonably
requested by Acquiror or the Company for any regulatory application or filing made or approval sought in connection with the transactions
contemplated by the Merger Agreement (including filings with the SEC).

 

ARTICLE
II

REPRESENTATIONS AND WARRANTIES

 

Section
2.1 Representations and Warranties of the Company Stockholders. Each Company Stockholder represents and warrants as of
the date hereof to Acquiror and the Company (severally and not jointly, and solely with respect to itself, himself or herself
and not with respect to any other Company Stockholder) as follows:

 

(a)
  Organization; Due Authorization. If such Company Stockholder is not an individual, it is duly organized, validly
existing and in good standing under the Laws of the jurisdiction in which it is incorporated, formed, organized or constituted,
and the execution, delivery and performance of this Agreement and the consummation of the transactions contemplated hereby are
within such Company Stockholder’s corporate, limited liability company or organizational powers and have been duly authorized
by all necessary corporate, limited liability company or organizational actions on the part of such Company Stockholder. If such
Company Stockholder is an individual, such Company Stockholder has full legal capacity, right and authority to execute and deliver
this Agreement and to perform his or her obligations hereunder. This Agreement has been duly executed and delivered by such Company
Stockholder and, assuming due authorization, execution and delivery by the other parties to this Agreement, this Agreement constitutes
a legally valid and binding obligation of such Company Stockholder, enforceable against such Company Stockholder in accordance
with the terms hereof (except as enforceability may be limited by bankruptcy Laws, other similar Laws affecting creditors’
rights and general principles of equity affecting the availability of specific performance and other equitable remedies). If this
Agreement is being executed in a representative or fiduciary capacity, the Person signing this Agreement has full power and authority
to enter into this Agreement on behalf of the applicable Company Stockholder.

 

    5

     

    

 

(b)
 Ownership. Such Company Stockholder is the record and beneficial owner (as defined in the Securities Act)
of, and has good title to, all of such Company Stockholder’s Subject Shares, and there exist no Liens or any other limitation
or restriction (including any restriction on the right to vote, sell or otherwise dispose of such Subject Shares (other than transfer
restrictions under the Securities Act)) affecting any such Subject Shares, other than Liens pursuant to (i) this Agreement, (ii)
the Company’s Governing Documents, (iii) the Merger Agreement, (iv) the Voting Agreement, dated December 31, 2020 (the “Voting
Agreement”), (v) the First Refusal and Co-Sale Agreement, dated December 31, 2020, (vi) the Amended and Restated Investors’
Rights Agreement, dated December 31, 2020, or (vii) any applicable securities Laws. Such Company Stockholder’s Subject Shares
are the only equity securities in the Company owned of record or beneficially by such Company Stockholder on the date of this
Agreement, and none of such Company Stockholder’s Subject Shares are subject to any proxy, voting trust or other agreement
or arrangement with respect to the voting of such Subject Shares other than as set forth hereunder and in the Voting Agreement.
Other than as set forth opposite such Company Stockholder’s name on Schedule I, such Company Stockholder does not hold or
own any rights to acquire (directly or indirectly) any equity securities of the Company or any equity securities convertible into,
or which can be exchanged for, equity securities of the Company.

 

(c) No Conflicts. The execution and delivery of this Agreement by such Company Stockholder does not, and the performance
by such Company Stockholder of his, her or its obligations hereunder will not, (i) if such Company Stockholder is not an individual,
conflict with or result in a violation of the organizational documents of such Company Stockholder or (ii) require any consent
or approval that has not been given or other action that has not been taken by any Person (including under any Contract binding
upon such Company Stockholder or such Company Stockholder’s Subject Shares), in each case, to the extent such consent, approval
or other action would prevent, enjoin or materially delay the performance by such Company Stockholder of its, his or her obligations
under this Agreement.

 

(d) Litigation. There are no Actions pending against such Company Stockholder, or to the knowledge of such Company
Stockholder threatened against such Company Stockholder, before (or, in the case of threatened Actions, that would be before)
any arbitrator or any Governmental Authority, which in any manner challenges or seeks to prevent, enjoin or materially delay the
performance by such Company Stockholder of its, his or her obligations under this Agreement.

 

(e) Adequate Information. Such Company Stockholder is a sophisticated stockholder and has adequate information
concerning the business and financial condition of Acquiror and the Company to make an informed decision regarding this Agreement
and the transactions contemplated by the Merger Agreement and has independently and without reliance upon Acquiror or the Company
and based on such information as such Company Stockholder has deemed appropriate, made its own analysis and decision to enter
into this Agreement. Such Company Stockholder acknowledges that Acquiror and the Company have not made and do not make any representation
or warranty, whether express or implied, of any kind or character except as expressly set forth in this Agreement. Such Company
Stockholder acknowledges that the agreements contained herein with respect to the Subject Shares held by such Company Stockholder
are irrevocable.

 

    6

     

    

 

(f) Brokerage Fees. Except as described on Section 4.17 of the Company Disclosure Letter, no broker, finder,
investment banker or other Person is entitled to any brokerage fee, finders’ fee or other commission in connection with
the transactions contemplated by the Merger Agreement based upon arrangements made by such Company Stockholder, for which the
Company or any of its Affiliates may become liable.

 

(g) Acknowledgment. Such Company Stockholder understands and acknowledges that each of Acquiror and the Company
is entering into the Merger Agreement in reliance upon such Company Stockholder’s execution and delivery of this Agreement.

 

ARTICLE
III

MISCELLANEOUS

 

Section
3.1 Termination. This Agreement and all of its provisions shall terminate and be of no further force or effect upon the
earlier of (a) the Expiration Time and (b) as to each Company Stockholder, the written agreement of Acquiror, the Company and
such Company Stockholder. Upon such termination of this Agreement, all obligations of the parties under this Agreement will terminate,
without any liability or other obligation on the part of any party hereto to any Person in respect hereof or the transactions
contemplated hereby, and no party hereto shall have any claim against another (and no person shall have any rights against such
party), whether under contract, tort or otherwise, with respect to the subject matter hereof; provided, however, that the
termination of this Agreement shall not relieve any party hereto from liability arising in respect of any breach of this Agreement
prior to such termination. This ARTICLE III shall survive the termination of this Agreement.

 

Section
3.2 Governing Law. This Agreement, and all claims or causes of action (whether in contract or tort) that may be based upon,
arise out of or relate to this Agreement or the negotiation, execution or performance of this Agreement (including any claim or
cause of action based upon, arising out of or related to any representation or warranty made in or in connection with this Agreement)
will be governed by and construed in accordance with the internal Laws of the State of Delaware applicable to agreements executed
and performed entirely within such State, without giving effect to principals of or rules of conflict of Laws to the extent such
principles or rules would require or permit the applicable of Laws of another jurisdiction.

 

Section
3.3 CONSENT TO JURISDICTION AND SERVICE OF PROCESS; WAIVER OF JURY TRIAL.

 

(a)
  THE PARTIES TO THIS AGREEMENT SUBMIT TO THE EXCLUSIVE JURISDICTION OF THE COURT OF CHANCERY OF THE STATE OF DELAWARE (OR,
TO THE EXTENT SUCH COURT DOES NOT HAVE SUBJECT MATTER JURISDICTION, THE SUPERIOR COURT OF THE STATE OF DELAWARE OR, IF IT HAS
OR CAN ACQUIRE JURISDICTION, THE UNITED STATES DISTRICT COURT FOR THE DISTRICT OF DELAWARE) IN RESPECT OF THE INTERPRETATION AND
ENFORCEMENT OF THE PROVISIONS OF THIS AGREEMENT AND ANY RELATED AGREEMENT, CERTIFICATE OR OTHER DOCUMENT DELIVERED IN CONNECTION
HEREWITH AND BY THIS AGREEMENT WAIVE, AND AGREE NOT TO ASSERT, ANY DEFENSE IN ANY ACTION FOR THE INTERPRETATION OR ENFORCEMENT
OF THIS AGREEMENT AND ANY RELATED AGREEMENT, CERTIFICATE OR OTHER DOCUMENT DELIVERED IN CONNECTION HEREWITH, THAT THEY ARE NOT
SUBJECT THERETO OR THAT SUCH ACTION MAY NOT BE BROUGHT OR IS NOT MAINTAINABLE IN SUCH COURTS OR THAT THIS AGREEMENT MAY NOT BE
ENFORCED IN OR BY SUCH COURTS OR THAT THEIR PROPERTY IS EXEMPT OR IMMUNE FROM EXECUTION, THAT THE ACTION IS BROUGHT IN AN INCONVENIENT
FORUM, OR THAT THE VENUE OF THE ACTION IS IMPROPER AND FURTHER AGREES NOT TO BRING ANY PROCEEDING OR ACTION ARISING OUT OF OR
RELATED TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY IN ANY OTHER COURT. SERVICE OF PROCESS WITH RESPECT THERETO
MAY BE MADE UPON ANY PARTY TO THIS AGREEMENT BY MAILING A COPY THEREOF BY REGISTERED OR CERTIFIED MAIL, POSTAGE PREPAID, TO SUCH
PARTY AT ITS ADDRESS AS PROVIDED IN Section 3.8.

 

    7

     

    

 

(b)
WAIVER OF TRIAL BY JURY. EACH PARTY HERETO HEREBY ACKNOWLEDGES AND AGREES THAT ANY CONTROVERSY WHICH MAY ARISE UNDER THIS
AGREEMENT IS LIKELY TO INVOLVE COMPLICATED AND DIFFICULT ISSUES, AND THEREFORE EACH SUCH PARTY HEREBY IRREVOCABLY AND UNCONDITIONALLY
WAIVES ANY RIGHT SUCH PARTY MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LITIGATION DIRECTLY OR INDIRECTLY ARISING OUT OF OR
RELATING TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT. EACH PARTY CERTIFIES AND ACKNOWLEDGES THAT (I)
NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT,
IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER, (II) EACH SUCH PARTY UNDERSTANDS AND HAS CONSIDERED THE IMPLICATIONS
OF THIS WAIVER, (III) EACH SUCH PARTY MAKES THIS WAIVER VOLUNTARILY, AND (IV) EACH SUCH PARTY HAS BEEN INDUCED TO ENTER INTO THIS
AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS Section
3.3.

 

Section
3.4 Assignment. This Agreement and all of the provisions hereof will be binding upon and inure to the benefit of the parties
hereto and their respective heirs, successors and permitted assigns. Neither this Agreement nor any of the rights, interests or
obligations hereunder will be assigned (including by operation of law) without the prior written consent of all of the other parties
hereto.

 

Section
3.5 Specific Performance. The parties hereto agree that irreparable damage may occur in the event that any of the provisions
of this Agreement were not performed in accordance with their specific terms or were otherwise breached. It is accordingly agreed
that the parties hereto shall be entitled to seek an injunction or injunctions to prevent breaches of this Agreement and to enforce
specifically the terms and provisions of this Agreement in the Court of Chancery of the State of Delaware (or, to the extent such
court does not have subject matter jurisdiction, the Superior Court of the State of Delaware or the United States District Court
for the District of Delaware), this being in addition to any other remedy to which such party is entitled at law or in equity.
In the event that any Action shall be brought in equity to enforce the provisions of this Agreement, no party shall allege, and
each party hereby waives the defense, that there is an adequate remedy at law, and each party agrees to waive any requirement
for the securing or posting of any bond in connection therewith.

 

    8

     

    

 

Section
3.6 Amendment; Waiver. This Agreement or any provision hereof may not be amended, changed, supplemented, waived or otherwise
modified or terminated, except upon the execution and delivery of a written agreement executed by Acquiror, the Company and each
of the Company Stockholders.

 

Section
3.7 Severability. If any provision of this Agreement is held invalid or unenforceable by any court of competent jurisdiction,
the other provisions of this Agreement will remain in full force and effect. Any provision of this Agreement held invalid or unenforceable
only in part or degree will remain in full force and effect to the extent not held invalid or unenforceable.

 

Section
3.8 Notices. All notices and other communications among the parties hereto shall be in writing and shall be deemed to have
been duly given (a) when delivered in person, (b) when delivered after posting in the United States mail having been sent registered
or certified mail return receipt requested, postage prepaid, (c) when delivered by FedEx or other nationally recognized overnight
delivery service or (d) when e-mailed during normal business hours (and otherwise as of the immediately following Business Day,
addressed as follows:

 

If
to Acquiror:

 

NextGen
Acquisition Corporation

2255
Glades Road, Suite 324A

Boca
Raton, FL 33431

		Attention:	Patrick
Ford

		Email:	pford@nextgenacq.com

 

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

 

Skadden,
Arps, Slate, Meagher & Flom LLP

One Manhattan West

New York, New York 10001

		Attention:	Howard
L. Ellin

			June
                                         S. Dipchand

		Email:	howard.ellin@skadden.com

		 	june.dipchand@skadden.com

 

If
to the Company:

 

Xos,
Inc.

3550
Tyburn Street

Los
Angeles, CA 90065

		Attention:	Dakota
Semler

		Email:	[*]

 

    9

     

    

 

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

 

Cooley
LLP

101
California Street, 5th Floor

San
Francisco, CA 94111

		Attention:	Garth
                                         Osterman

			Dave
                                         Peinsipp

		Email:	gosterman@cooley.com

		 	dpeinsipp@cooley.com

 

If
to a Company Stockholder:

 

To
such Company Stockholder’s address set forth in Schedule I hereto

 

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

Cooley
LLP

101
California Street, 5th Floor

San
Francisco, CA 94111

		Attention:	Garth
                                         Osterman

			Dave
                                         Peinsipp

		Email:	gosterman@cooley.com

		 	dpeinsipp@cooley.com

 

Section
3.9 Company Stockholder Liability. Notwithstanding any other provision of this Agreement, in no event will any Company
Stockholder be liable for any other Company Stockholder’s breach of such other Company Stockholder’s representations,
warranties, covenants, or agreements contained in this Agreement.

 

Section
3.10 Counterparts. This Agreement may be executed in two or more counterparts (any of which may be delivered by electronic
transmission), each of which shall constitute an original, and all of which taken together shall constitute one and the same instrument.

 

Section
3.11 Entire Agreement. This Agreement and the agreements referenced herein constitute the entire agreement and understanding
of the parties hereto in respect of the subject matter hereof and supersede all prior understandings, agreements or representations
by or among the parties hereto to the extent they relate in any way to the subject matter hereof.

 

[THE
REMAINDER OF THIS PAGE IS INTENTIONALLY BLANK]

 

    10

     

    

 

IN
WITNESS WHEREOF, the Company Stockholders, Acquiror, and the Company have each caused this Stockholder Support Agreement to be
duly executed as of the date first written above.

 

	 	COMPANY STOCKHOLDERS:
	 	 	 
	 	[STOCKHOLDER]
	 	 	 
	 	By:	                
	 	 	Name:

 

[Signature Page to Stockholder Support Agreement]

 

     

     

    

 

	 	COMPANY STOCKHOLDERS:
	 	 
	 	[STOCKHOLDER]
	 	 
	 	By:	                         
	 	 	Name: 	                          
	 	 	Title:	          

 

[Signature Page to
Stockholder Support Agreement]

 

     

     

    

 

	 	COMPANY STOCKHOLDERS:
	 	 	 
	 	[STOCKHOLDER]
	 	 	 
	 	By:	                     
	 		Name:
	 		Title:

  

[Signature Page to Stockholder Support Agreement]

 

     

     

    

 

	 	ACQUIROR:
	 	 	 	 
	 	NEXTGEN ACQUISITION CORPORATION
	 	 	 	 
	 	By:	                           
	 	 	Name:	 
	 	 	Title:	                 

 

[Signature Page to Stockholder Support Agreement]

 

     

     

    

 

	 	COMPANY:
	 	 	 
	 	XOS, INC.
	 	 	 
	 	By:	                        
	 	 	Name:
	 	 	Title:

 

[Signature Page to Stockholder Support Agreement]

 

     

     

    

 

Annex
A

 

Form
of Joinder Agreement 

 

This
Joinder Agreement (this “Joinder Agreement”) is made as of the date written below by the undersigned (the “Joining
Party”) in accordance with the Stockholder Support Agreement, dated as of [___], 2021 (as amended, supplemented or otherwise
modified from time to time, the “Support Agreement”), by and among NextGen Acquisition Corporation, a Cayman
Islands exempted company limited by shares (which shall migrate to and domesticate as a Delaware corporation), Xos, Inc., a Delaware
corporation, and the Company Stockholders set forth on Schedule I thereto. Capitalized terms used herein and not otherwise defined
shall have the meaning ascribed to them in the 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 “Company Stockholder” under, the Support Agreement as of the date hereof and shall
have all of the rights and obligations of a Company Stockholder as if it had executed the 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
Support Agreement.

 

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

 

	Date:
    [___], 2021	 	 
	 	 	 
	 	By:	 
	 	 	Name:
	 	 	Title:
	 	 
	 	Address
    for Notices:
	 	 
	 	With
    copies to:Exhibit 10.4

 

FORM OF LOCK-UP AGREEMENT

 

__________, 2021

 

Xos, Inc.

Tyburn St., Unit 100

Los Angeles, CA 90065

 

Re: Lock-Up Agreement

 

Ladies and Gentlemen:

 

This letter agreement (this “Letter
Agreement”) is being delivered to Xos, Inc. (f/k/a NextGen Acquisition Corporation), a Delaware corporation (the
“Company”), in accordance with the Agreement and Plan of Merger (the “Merger Agreement”)
entered into by and among the Company, Sky Merger Sub I, Inc., a Delaware corporation and a direct, wholly owned subsidiary of
the Company (“Merger Sub”), and [Legacy Xos] (f/k/a Xos, Inc.), a Delaware corporation (“Legacy
Xos”), pursuant to which, among other things, Merger Sub will be merged with and into Legacy Xos on or about the
date hereof (the “Merger”), with Legacy Xos surviving the Merger as a wholly owned subsidiary of the
Company. Capitalized terms used but not otherwise defined in this Agreement shall have the meanings ascribed thereto in the Merger
Agreement.

 

In order to induce the Company to proceed
with the Merger, the PIPE Investment and other transactions contemplated in the Merger Agreement (collectively, the “Transactions”)
and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the undersigned (the
“Securityholder”) hereby agrees with the Company as follows.

 

Subject to the exceptions set forth herein,
the Securityholder agrees not to, without the prior written consent of the board of directors of the Company, (i) sell, offer to
sell, contract or agree to sell, hypothecate, pledge, grant any option, right or warrant to purchase or otherwise transfer or dispose
of, or agree to transfer or dispose of, directly or indirectly, or establish or increase a put equivalent position or liquidate
or decrease a call equivalent position within the meaning of Section 16 of the Securities Exchange Act of 1934, as amended (the
“Exchange Act”), and the rules and regulations of the Securities and Exchange Commission promulgated
thereunder, any shares of Common Stock, par value $0.0001 per share, of the Company (“Common Stock”)
held by it immediately after the closing of the Transactions (the “Closing”), any shares of Common Stock
issuable upon the exercise of options to purchase shares of Common Stock held by it immediately after the Closing, or any securities
convertible into or exercisable or exchangeable for Common Stock held by it immediately after the Closing (the “Securities”),
(ii) enter into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences
of ownership of any of such Securities, whether any such transaction is to be settled by delivery of such securities, in cash or
otherwise or (iii) publicly announce any intention to effect any transaction specified in clause (i) or (ii) (the actions specified
in clauses (i)-(iii), collectively, “Transfer”) until [180 days][two years]1
after the Closing (the “Lock-Up Period”).

 

The restrictions set forth in the immediately
preceding paragraph shall not apply to:

 

		(i)	in the case of an entity, Transfers to a stockholder, partner, member or affiliate of such entity;

 

 

		1	To be included for Dakota Semler and Giordano Sordoni.

 

    1

     

    

 

		(ii)	in the case of an individual, Transfers by gift to members of the individual’s immediate family (as defined below) or
to a trust, the beneficiary of which is a member of one of the individual’s immediate family, an affiliate of such person
or to a charitable organization;

 

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

 

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

 

		(v)	in the case of an entity, Transfers by virtue of the laws of the state of the entity’s organization and the entity’s
organizational documents upon dissolution of the entity;

 

		(vi)	transactions relating to Common Stock or other securities convertible into or exercisable or exchangeable for Common Stock
acquired in open market transactions after the Closing, provided that no such transaction is required to be, or is, publicly
announced (whether on Form 4, Form 5 or otherwise, other than a required filing on Schedule 13F, 13G or 13G/A) during the Lock-Up
Period;

 

		(vii)	the exercise of any options or warrants to purchase Common Stock (which exercises may be effected on a cashless basis to the
extent the instruments representing such options or warrants permit exercises on a cashless basis);

 

		(viii)	Transfers to the Company to satisfy tax withholding obligations pursuant to the Company’s equity incentive plans or arrangements;

 

		(ix)	Transfers to the Company pursuant to any contractual arrangement in effect at the Closing that provides for the repurchase
by the Company or forfeiture of the Securityholder’s Common Stock or other securities convertible into or exercisable or
exchangeable for Common Stock in connection with the termination of the Securityholder’s service to the Company;

 

		(x)	the establishment of a trading plan that meets the requirements of Rule 10b5-1(c) under the Exchange Act (a “Trading
Plan”) [or the sale of Securities by the Securityholder pursuant to a Trading Plan]2;
provided, however, that no sales of Securities, shall be made by Securityholder pursuant to such Trading Plan during
[the 180-day period immediately after the Closing]3 [the Lock-Up Period]4
and no public announcement or filing is voluntarily made regarding such plan during [the 180-day period immediately after the Closing]5
[the Lock-Up Period]6.

 

		(xi)	transactions in the event of completion of a liquidation, merger, stock exchange or other similar transaction which results
in all of the Company’s securityholders having the right to exchange their shares of Common Stock for cash, securities or
other property; and

 

		(xii)	transactions to satisfy any U.S. federal, state, or local income tax obligations of the Securityholder (or its direct or indirect
owners) arising from a change in the U.S. Internal Revenue Code of 1986, as amended (the “Code”), or
the U.S. Treasury Regulations promulgated thereunder (the “Regulations”) after the date on which the
Merger Agreement was executed by the parties, and such change prevents the Merger from qualifying as a “reorganization”
pursuant to Section 368 of the Code (and the Merger does not qualify for similar tax-free treatment pursuant to any successor or
other provision of the Code or Regulations taking into account such changes), in each case, solely to the extent necessary to cover
any tax liability as a result of the transaction.

 

 

2
To be included for Dakota Semler and Giordano Sordoni.

3
To be included for Dakota Semler and Giordano Sordoni.

4
To be deleted for Dakota Semler and Giordano Sordoni.

5
To be included for Dakota Semler and Giordano Sordoni.

6
To be deleted for Dakota Semler and Giordano Sordoni.

 

    2

     

    

  

provided, however, that in the case of clauses (i) through
(v), these permitted transferees must enter into a written agreement, in substantially the form of this Letter Agreement (it being
understood that any references to “immediate family” in the agreement executed by such transferee shall expressly refer
only to the immediate family of the Securityholder and not to the immediate family of the transferee), agreeing to be bound by
these Transfer restrictions. For purposes of this paragraph, “immediate family” shall mean a spouse, domestic partner,
child, grandchild or other lineal descendant (including by adoption), father, mother, brother or sister of the Securityholder;
and “affiliate” shall have the meaning set forth in Rule 405 under the Securities Act of 1933, as amended.

 

[Notwithstanding the above, the Securityholder
shall be entitled to Transfer shares of Common Stock pursuant to that certain stock transfer agreement, dated the date hereof,
which provides for the sale by the Securityholder of up to 1,000,000 shares of Common Stock.]7

 

The Securityholder hereby represents and
warrants that such Securityholder has full power and authority to enter into this Letter Agreement and that this Letter Agreement
constitutes the legal, valid and binding obligation of the Securityholder, enforceable in accordance with its terms. Upon request,
the Securityholder will execute any additional documents necessary in connection with enforcement hereof. Any obligations of the
Securityholder shall be binding upon the successors and assigns of the Securityholder from and after the date hereof.

 

This Letter Agreement constitutes the entire
agreement and understanding of the parties hereto in respect of the subject matter hereof and supersedes all prior understandings,
agreements or representations by or among the parties hereto, written or oral, to the extent they relate in any way to the subject
matter hereof or the transactions contemplated hereby. This Letter Agreement may not be changed, amended, modified or waived (other
than to correct a typographical error) as to any particular provision, except by a written instrument executed by all parties hereto.

 

No party hereto may assign either this Letter
Agreement or any of its rights, interests or obligations hereunder without the prior written consent of the other party. Any purported
assignment in violation of this paragraph shall be void and ineffectual and shall not operate to transfer or assign any interest
or title to the purported assignee. This Letter Agreement shall be binding on the Securityholder and each of its respective successors,
heirs and assigns and permitted transferees.

 

This Letter Agreement shall be governed
by and construed and enforced in accordance with the laws of the State of Delaware, without giving effect to conflicts of law principles
that would result in the application of the substantive laws of another jurisdiction. The parties hereto (i) all agree that any
action, proceeding, claim or dispute arising out of, or relating in any way to, this Letter Agreement shall be brought and enforced
in any Delaware Chancery Court, and irrevocably submit to such jurisdiction and venue, which jurisdiction and venue shall be exclusive
and (ii) waive any objection to such exclusive jurisdiction and venue or that such courts represent an inconvenient forum.

 

This Letter Agreement may be delivered via
facsimile, electronic mail (including pdf or any electronic signature complying with the U.S. federal ESIGN Act of 2000, e.g.,
www.docusign.com or www.echosign.com) or other transmission method and any counterpart so delivered shall be deemed to have been
duly and validly delivered and be valid and effective for all purposes.

 

This Letter Agreement shall terminate on
the expiration of the Lock-Up Period.

 

[remainder of page intentionally left
blank]

  

 

7
To be included for Dakota Semler and Giordano Sordoni.

 

    3

     

    

 

	 	Very truly yours,
	 	 
	 	                  
	 	(Name of Securityholder – Please Print)
	 	 
	 	 
	 	(Signature)
	 	 
	 	 
	 	(Name of Signatory if Securityholder is an entity – Please Print)
	 	 
	 	 
	 	(Title of Signatory if Securityholder is an entity – Please Print)
	 	 
	 	Address:	                       
	 	 	 
	 	 	 
	 	 	 
	 	 	      

 

[Signature Page to Lock-Up Agreement]

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