Document:

EX-10.18

 Exhibit 10.18 

SUPPORT AGREEMENT 
 This
Support Agreement (this “Agreement”), dated as of September 15, 2019, is entered into by and among Mosaic Acquisition Corp., a Delaware corporation (“Acquiror”), Maiden Merger Sub, Inc., a Delaware corporation
and wholly-owned subsidiary of Acquiror (“Merger Sub”), and 313 Acquisition LLC, a Delaware limited liability company (the “Stockholder”). 

RECITALS 
 WHEREAS,
concurrently herewith, Acquiror, Vivint Smart Home, Inc., a Delaware corporation (“Company”), and Merger Sub are entering into an Agreement and Plan of Merger (as amended, supplemented, restated or otherwise modified from time to
time, the “Merger Agreement”; capitalized terms used but not otherwise defined in this Agreement shall have the meanings ascribed to them in the Merger Agreement), pursuant to which (and subject to the terms and conditions set forth
therein) Merger Sub will merge with and into the Company, with the Company surviving the merger (the “Merger”); 
 WHEREAS,
as of the date hereof, the Stockholder is the record and “beneficial owner” (within the meaning of Rule 13d-3 under the Securities Exchange Act of 1934, as amended (together with the rules and
regulations promulgated thereunder, the “Exchange Act”)) of and is entitled to dispose of and vote 1,005,031.4660 shares of Company Common Stock (the “Owned Shares”; the Owned Shares and any additional shares of
Company Stock (or any securities convertible into or exercisable or exchangeable for Company Stock) in which the Stockholder acquires record and beneficial ownership after the date hereof, including by purchase, as a result of a stock dividend,
stock split, recapitalization, combination, reclassification, exchange or change of such shares, or upon exercise or conversion of any securities, the “Covered Shares”); 

WHEREAS, as a condition and inducement to the willingness of Acquiror and Merger Sub to enter into the Merger Agreement, the Company and the
Stockholder are entering into this Agreement. 
 AGREEMENT 

NOW, THEREFORE, in consideration of the foregoing and the mutual covenants and agreements herein contained, and intending to be legally bound
hereby, Acquiror, Merger Sub and the Stockholder hereby agree as follows: 
 1.    Agreement to Vote. Subject to
the earlier termination of this Agreement in accordance with Section 3 and the last paragraph of this Section 1, the Stockholder, in its capacity as a stockholder of the Company, irrevocably and unconditionally agrees that it shall, and
shall cause any other holder of record of any of the Stockholder’s Covered Shares to, validly execute and deliver to the Company, on (or effective as of) the third (3rd) Business Day following the date that the consent solicitation
statement/prospectus included in the Registration Statement is disseminated to the Company’s stockholders (following the date that the Registration Statement becomes effective), the written consent in the form attached hereto as Exhibit
A in respect of all of the Stockholder’s Covered Shares. In addition, subject to the last paragraph of this Section 1, prior to the Termination Date (as defined herein), the Stockholder, in its capacity as a stockholder of the Company,
irrevocably and unconditionally agrees that, at any 

 
other meeting of the stockholders of the Company (whether annual or special and whether or not an adjourned or postponed meeting, however called and including any adjournment or postponement
thereof) and in connection with any written consent of stockholders of the Company, the Stockholder shall, and shall cause any other holder of record of any of the Stockholder’s Covered Shares to: 

(a)    when such meeting is held, appear at such meeting or otherwise cause the Stockholder’s Covered Shares to be
counted as present thereat for the purpose of establishing a quorum; 
 (b)    vote (or execute and return an action by
written consent), or cause to be voted at such meeting (or validly execute and return and cause such consent to be granted with respect to), all of the Stockholder’s Covered Shares owned as of the record date for such meeting (or the date that
any written consent is executed by the Stockholder) in favor of the Merger and the adoption of the Merger Agreement and any other matters necessary or reasonably requested by the Company for consummation of the Merger and the other transactions
contemplated by the Merger Agreement; and 
 (c)    vote (or execute and return an action by written consent), or cause
to be voted at such meeting, or validly execute and return and cause such consent to be granted with respect to, all of the Stockholder’s Covered Shares against any Acquisition Proposal and any other action that would reasonably be expected to
materially impede, interfere with, delay, postpone or adversely affect the Merger or any of the other transactions contemplated by the Merger Agreement or result in a breach of any covenant, representation or warranty or other obligation or
agreement of the Company under the Merger Agreement or result in a breach of any covenant, representation or warranty or other obligation or agreement of the Stockholder contained in this Agreement. 

The obligations of the Stockholder specified in this Section 1 shall apply whether or not the Merger or any action described above is recommended by the
Company Board or the Company Board has effected a Company Change in Recommendation; provided, however, that in the event the Company Board effects a Company Change in Recommendation in compliance with Sections 6.09(c) and 6.09(d) of
the Merger Agreement: (i) the number of shares of Company Stock that the Stockholder shall be committed to vote (or execute a written consent in respect to) in accordance with the preceding provisions of this Section 1 shall be modified to
be only such number that is equal to 35.00% of the total number of outstanding shares of Company Stock (the “Lock-Up Covered Shares”), such that the Stockholder shall only be obligated to
execute a written consent with respect to, or otherwise vote, the Lock-Up Covered Shares in the manner set forth in this Section 1 and (ii) the Stockholder shall be entitled (in its sole discretion)
to vote any shares of Company Stock that it is entitled to vote, other than the Lock-Up Covered Shares, in any manner. 

2.    No Inconsistent Agreements. The Stockholder hereby covenants and agrees that the Stockholder shall not, at
any time prior to the Termination Date, (i) enter into any voting agreement or voting trust with respect to any of the Stockholder’s Covered Shares that is inconsistent with the Stockholder’s obligations pursuant to this Agreement,
(ii) grant a proxy or power of attorney with respect to any of the Stockholder’s Covered Shares that is inconsistent 

  
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with the Stockholder’s obligations pursuant to this Agreement, or (iii) enter into any agreement or undertaking that is otherwise inconsistent with, or would interfere with, or prohibit
or prevent it from satisfying, its obligations pursuant to this Agreement. 
 3.    Termination. This Agreement
shall terminate upon the earliest of (i) the Effective Time, (ii) the termination of the Merger Agreement in accordance with its terms and (iii) the time this Agreement is terminated upon the mutual written agreement of Acquiror,
Merger Sub and the Stockholder (the earliest such date under clause (i), (ii) and (iii) being referred to herein as the “Termination Date”); provided, that the provisions set forth in Sections 10 to 21 shall survive the
termination of this Agreement; provided further, that termination of this Agreement shall not relieve any party hereto from any liability for any Willful Breach of, or actual fraud in connection with, this Agreement prior to such
termination. 
 4.    Representations and Warranties of the Stockholder. The Stockholder hereby represents and
warrants to Acquiror as to itself as follows: 
 (a)    The Stockholder is the only record and a
beneficial owner (within the meaning of Rule 13d-3 under the Exchange Act) of, and has good, valid and marketable title to, the Covered Shares, free and clear of Liens other than as created by this Agreement.
As of the date hereof, other than the Owned Shares, the Stockholder does not own beneficially or of record any shares of capital stock of the Company (or any securities convertible into shares of capital stock of the Company) or any interest
therein. 
 (b)    The Stockholder (i) except as provided in this Agreement, has full voting power,
full power of disposition and full power to issue instructions with respect to the matters set forth herein, in each case, with respect to the Stockholder’s Covered Shares, (ii) has not entered into any voting agreement or voting trust
with respect to any of the Stockholder’s Covered Shares that is inconsistent with the Stockholder’s obligations pursuant to this Agreement, (iii) has not granted a proxy or power of attorney with respect to any of the
Stockholder’s Covered Shares that is inconsistent with the Stockholder’s obligations pursuant to this Agreement and (iv) has not entered into any agreement or undertaking that is otherwise inconsistent with, or would interfere with,
or prohibit or prevent it from satisfying, its obligations pursuant to this Agreement. 
 (c)    The
Stockholder (i) is a legal entity duly organized, validly existing and, to the extent such concept is applicable, in good standing under the Laws of the jurisdiction of its organization, and (ii) has all requisite corporate or other power
and authority and has taken all corporate or other action necessary in order to, execute, deliver and perform its obligations under this Agreement and to consummate the transactions contemplated hereby. This Agreement has been duly executed and
delivered by the Stockholder and constitutes a valid and binding agreement of the Stockholder enforceable against the Stockholder in accordance with its terms, subject to applicable bankruptcy, insolvency, fraudulent conveyance, reorganization,
moratorium and similar Laws affecting creditors’ rights generally and subject, as to enforceability, to general principles of equity. 

  
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 (d)    Other than the filings, notices and reports
pursuant to, in compliance with or required to be made under the Exchange Act, no filings, notices, reports, consents, registrations, approvals, permits, waivers, expirations of waiting periods or authorizations are required to be obtained by the
Stockholder from, or to be given by the Stockholder to, or be made by the Stockholder with, any Governmental Authority in connection with the execution, delivery and performance by the Stockholder of this Agreement, the consummation of the
transactions contemplated hereby or the Merger and the other transactions contemplated by the Merger Agreement. 

(e)    The execution, delivery and performance of this Agreement by the Stockholder do not, and the
consummation of the transactions contemplated hereby or the Merger and the other transactions contemplated by the Merger Agreement will not, constitute or result in (i) a breach or violation of, or a default under, the limited liability company
agreement or similar governing documents of the Stockholder, (ii) with or without notice, lapse of time or both, a breach or violation of, a termination (or right of termination) of or a default under, the loss of any benefit under, the
creation, modification or acceleration of any obligations under or the creation of a Lien on any of the properties, rights or assets of the Stockholder pursuant to any Contract binding upon the Stockholder or, assuming (solely with respect to
performance of this Agreement and the transactions contemplated hereby), compliance with the matters referred to in Section 4(d), under any applicable Law to which the Stockholder is subject or (iii) any change in the rights or obligations
of any party under any Contract legally binding upon the Stockholder, except, in the case of clause (ii) or (iii) directly above, for any such breach, violation, termination, default, creation, acceleration or change that would not,
individually or in the aggregate, reasonably be expected to prevent or materially delay or impair the Stockholder’s ability to perform its obligations hereunder or to consummate the transactions contemplated hereby, the consummation of the
Merger or the other transactions contemplated by the Merger Agreement. 
 (f)    As of the date of this
Agreement, there is no action, proceeding or investigation pending against the Stockholder or, to the knowledge of the Stockholder, threatened against the Stockholder that questions the beneficial or record ownership of the Stockholder’s Owned
Shares, the validity of this Agreement or the performance by the Stockholder of its obligations under this Agreement. 

(g)    The Stockholder understands and acknowledges that Acquiror is entering into the Merger Agreement in
reliance upon the Stockholder’s execution and delivery of this Agreement and the representations, warranties, covenants and other agreements of the Stockholder contained herein. 

(h)    No investment banker, broker, finder or other intermediary is entitled to any broker’s,
finder’s, financial advisor’s or other similar fee or commission for which Acquiror or the Company is or will be liable in connection with the transactions contemplated hereby based upon arrangements made by or, to the knowledge of the
Stockholder, on behalf of the Stockholder. 

  
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 5.    Certain Covenants of the Stockholder. Except in accordance
with the terms of this Agreement, the Stockholder hereby covenants and agrees as follows: 
 (a)    No
Solicitation. Subject to Section 6 hereof, prior to the Termination Date, the Stockholder shall not, and shall cause its Affiliates and subsidiaries not to and shall use its reasonable best efforts to cause its and their respective
Representatives not to, directly or indirectly, (i) initiate, solicit or knowingly encourage or knowingly facilitate any inquiries or requests for information with respect to, or the making of, any inquiry regarding, or any proposal or offer
that constitutes, or could reasonably be expected to result in or lead to, any Acquisition Proposal, (ii) engage in, continue or otherwise participate in any negotiations or discussions concerning, or provide access to its properties, books and
records or any confidential information or data to, any Person relating to any proposal, offer, inquiry or request for information that constitutes, or could reasonably be expected to result in or lead to, any Acquisition Proposal,
(iii) approve, endorse or recommend, or propose publicly to approve, endorse or recommend, any Acquisition Proposal, (iv) execute or enter into, any letter of intent, memorandum of understanding, agreement in principle, confidentiality
agreement, merger agreement, acquisition agreement, exchange agreement, joint venture agreement, partnership agreement, option agreement or other similar agreement for or relating to any Acquisition Proposal or (v) resolve or agree to do any of
the foregoing. The Stockholder also agrees that immediately following the execution of this Agreement it shall, and shall cause each of its Affiliates and subsidiaries and shall use its reasonable best efforts to cause its and their Representatives
to, cease any solicitations, discussions or negotiations with any Person (other than the Parties and their respective Representatives) conducted heretofore in connection with an Acquisition Proposal or any inquiry or request for information that
could reasonably be expected to lead to, or result in, an Acquisition Proposal. The Stockholder also agrees that within three (3) Business Days of the execution of this Agreement, the Stockholder shall request each Person (other than the
Parties and their respective Representatives) that has prior to the date hereof executed a confidentiality agreement in connection with its consideration of acquiring the Company (and with whom the Stockholder has had contact in 12 months prior to
the date of this Agreement regarding the acquisition of the Company) to return or destroy all confidential information furnished to such Person by or on behalf of it or any of its subsidiaries prior to the date hereof (provided, the Stockholder
shall be deemed to have complied with the foregoing obligation with respect to any request so required to be made to the extent the Company has made an equivalent request under the applicable confidentiality agreement) and terminate access to any
physical or electronic data room maintained by the Stockholder on behalf of the Company or any of its subsidiaries. The Stockholder shall promptly (and in any event within one Business Day) notify, in writing, Acquiror of the receipt of any inquiry,
proposal, offer or request for information received after the date hereof that constitutes, or could reasonably be expected to result in or lead to, any Acquisition Proposal, which notice shall include a summary of the material terms of, and the
identity of the Person or group of Persons making, such inquiry, proposal, offer or request for information and an unredacted copy of any Acquisition Proposal or inquiry, proposal or offer made in writing or, if not in writing, a written description
of the material terms and conditions of such inquiry, proposal or offer (and shall include any other documents evidencing or specifying the terms of such proposal, offer, inquiry or request). 

  
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The Stockholder shall promptly (and in any event within one Business Day) keep Acquiror reasonably informed of any material developments with respect to any such inquiry, proposal, offer, request
for information or Acquisition Proposal (including any material changes thereto and copies of any additional written materials received by the Stockholder, the Company, its subsidiaries or their respective Affiliates or Representatives). 

Notwithstanding anything in this Agreement to the contrary, (i) the Stockholder shall not be responsible for the actions
of the Company or its Board of Directors (or any Committee thereof), any Subsidiary of the Company, or any officers, directors (in their capacity as such), employees and professional advisors of any of the foregoing (the “Company Related
Parties”), including with respect to any of the matters contemplated by this Section 5(a), (ii) the Stockholder makes no representations or warranties with respect to the actions of any of the Company Related Parties, and
(iii) any breach by the Company of its obligations under Section 6.09(a) of the Merger Agreement shall not be considered a breach of this Section 5(a) (it being understood for the avoidance of doubt that the Stockholder shall remain
responsible for any breach by it or its Representatives (other than any such Representative that is a Company Related Party) of this Section 5(a)). 

(b)    The Stockholder hereby agrees not to, directly or indirectly, (i) sell, transfer, pledge, encumber, assign,
hedge, swap, convert or otherwise dispose of (including by merger (including by conversion into securities or other consideration), by tendering into any tender or exchange offer, by testamentary disposition, by operation of Law or otherwise),
either voluntarily or involuntarily (collectively, “Transfer”), or enter into any Contract or option with respect to the Transfer of any of the Stockholder’s Covered Shares, or (ii) take any action that would make any
representation or warranty of the Stockholder contained herein untrue or incorrect or have the effect of preventing or disabling the Stockholder from performing its obligations under this Agreement; provided, however, that nothing
herein shall prohibit a Transfer to an Affiliate of the Stockholder (a “Permitted Transfer”); provided, further, that any Permitted Transfer shall be permitted only if, as a precondition to such Transfer, the
transferee agrees in a writing, reasonably satisfactory in form and substance to Acquiror, to assume all of the obligations of the Stockholder under, and be bound by all of the terms of, this Agreement; provided, further, that any
Transfer permitted under this Section 5(b) shall not relieve the Stockholder of its obligations under this Agreement. Any Transfer in violation of this Section 5(b) with respect to the Stockholder’s Covered Shares shall be null and
void. 
 (c)    In furtherance of this Agreement, the Stockholder hereby authorizes and will instruct the Company,
promptly after the date hereof, to enter, or cause its transfer agent to enter, a stop transfer order with respect to all of the Stockholder’s Covered Shares with respect to any Transfer not permitted hereunder and to include the following
legend on any share certificates for the Stockholder’s Covered Shares: “THE SHARES OF STOCK REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO CERTAIN VOTING AND TRANSFER RESTRICTIONS PURSUANT TO THAT CERTAIN SUPPORT AGREEMENT, DATED AS OF
SEPTEMBER 15, 2019, BY AND BETWEEN MOSAIC ACQUISITION CORP., A DELAWARE CORPORATION, MAIDEN MERGER SUB, INC., A DELAWARE CORPORATION, AND 313 ACQUISITION LLC, A DELAWARE LIMITED LIABILITY 

  
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COMPANY. ANY TRANSFER OF SUCH SHARES OF STOCK IN VIOLATION OF THE TERMS AND PROVISIONS OF SUCH SUPPORT AGREEMENT SHALL BE NULL AND VOID AND HAVE NO FORCE OR EFFECT WHATSOEVER.” The delivery
of such securities by the delivering party shall not in any way affect such party’s rights with respect to such securities. 

(d)    In the event that the Stockholder intends to undertake a Permitted Transfer of any of the Stockholder’s
Covered Shares, the Stockholder shall provide notice thereof to Acquiror and shall authorize the Company to, or authorize the Company to instruct its transfer agent to, (i) lift any stop transfer order in respect of the Stockholder’s
Covered Shares to be so Transferred in order to effect such Permitted Transfer only upon certification by Acquiror that the written agreement to be entered into by the transferee agreeing to be bound by this Agreement pursuant to Section 5(b)
hereof is satisfactory to Acquiror and (ii) re-enter any stop transfer order in respect of the Stockholder’s Covered Shares to be so Transferred upon completion of the Permitted Transfer. 

(e)    The Stockholder hereby authorizes the Company to maintain a copy of this Agreement at either the executive office
or the registered office of the Company. 
 6.    Further Assurances. From time to time, at Acquiror’s
request and without further consideration, the Stockholder shall execute and deliver such additional documents and take all such further action as may be reasonably necessary or reasonably requested to effect the actions and consummate the
transactions contemplated by this Agreement. The Stockholder further agrees not to commence or participate in, and to take all actions necessary to opt out of any class in any class action with respect to, any action or claim, derivative or
otherwise, against Acquiror, Acquiror’s Affiliates, the Sponsors, the Company or any of their respective successors and assigns relating to the negotiation, execution or delivery of this Agreement, the Merger Agreement (including the Per Share
Merger Consideration) or the consummation of the transactions contemplated hereby and thereby. 

7.    Disclosure. The Stockholder hereby authorizes the Company and Acquiror to publish and disclose in any
announcement or disclosure required by the SEC the Stockholder’s identity and ownership of the Covered Shares and the nature of the Stockholder’s obligations under this Agreement; provided, that prior to any such publication or
disclosure the Company and Acquiror have provided the Stockholder with an opportunity to review and comment upon such announcement or disclosure, which comments the Company and Acquiror will consider in good faith. 

8.    Changes in Capital Stock. In the event of a stock split, stock dividend or distribution, or any change in the
Company’s capital stock by reason of any split-up, reverse stock split, recapitalization, combination, reclassification, exchange of shares or the like, the terms “Owned Shares” and
“Covered Shares” shall be deemed to refer to and include such shares as well as all such stock dividends and distributions and any securities into which or for which any or all of such shares may be changed or exchanged or which are
received in such transaction. 

  
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 9.    Amendment and Modification. This Agreement may not be
amended, modified or supplemented in any manner, whether by course of conduct or otherwise, except by an instrument in writing signed by Acquiror, Merger Sub and the Stockholder. 

10.    Waiver. No failure or delay by any party hereto exercising any right, power or privilege hereunder shall
operate as a waiver thereof nor shall any single or partial exercise thereof preclude any other or further exercise thereof or the exercise of any other right, power or privilege. The rights and remedies of the parties hereto hereunder are
cumulative and are not exclusive of any rights or remedies which they would otherwise have hereunder. Any agreement on the part of a party hereto to any such waiver shall be valid only if set forth in a written instrument executed and delivered by
such party. 
 11.    Notices. All notices and other communications hereunder shall be in writing and shall be
deemed given if delivered personally, by email (with confirmation of receipt) or sent by a nationally recognized overnight courier service, such as Federal Express, to the parties hereto at the following addresses (or at such other address for a
party as shall be specified by like notice made pursuant to this Section 11): 
  

			
	 if to the Stockholder, to it at:

	
	 313 Acquisition LLC

	 4931 North 300 West

	 Provo, Utah 84604

	 Attention:
	  	 Todd Pedersen

		  	 Alex Dunn

	 Email:
	  	 tpedersen@vivint.com

		  	 adunn@vivint.com

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

	
	 Simpson Thacher & Bartlett LLP

425 Lexington Avenue

	 New York, New York 10017

	 Attention:
	  	 Wilson S. Neely

		  	 Elizabeth A. Cooper

	 Email:
	  	 wneely@stblaw.com

		  	 ecooper@stblaw.com

	
	 if to Acquiror, to it at:

	
	 375 Park Avenue

	 New York, NY 10162

	 Attn:
	  	 David M. Maura

	 E-mail:
	  	 dmaura@mosaicac.com

  
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	 Paul, Weiss, Rifkind, Wharton & Garrison LLP

1285 Avenue of the Americas

	 New York, NY 10023

	 Attn:
	 	 Ross A. Fieldston

		 	 Jeffrey D. Marell

	 E-mail:
	 	 rfieldston@paulweiss.com

		 	 jmarell@pauweiss.com

 12.    No Ownership Interest. Nothing contained in this Agreement shall be deemed
to vest in Acquiror any direct or indirect ownership or incidence of ownership of or with respect to the Covered Shares of the Stockholder. All rights, ownership and economic benefits of and relating to the Covered Shares of the Stockholder shall
remain vested in and belong to the Stockholder, and Acquiror shall have no authority to direct the Stockholder in the voting or disposition of any of the Stockholder’s Covered Shares, except as otherwise provided herein. 

13.    Entire Agreement. This Agreement and the Merger Agreement constitute the entire agreement and supersede all
prior agreements and understandings, both written and oral, between the parties hereto with respect to the subject matter hereof and thereof. 

14.    No Third-Party Beneficiaries. The Stockholder hereby agrees that its representations, warranties and
covenants set forth herein are solely for the benefit of Acquiror in accordance with and subject to the terms of this Agreement, and this Agreement is not intended to, and does not, confer upon any Person other than the parties hereto any rights or
remedies hereunder, including the right to rely upon the representations and warranties set forth herein, and the parties hereto hereby further agree that this Agreement may only be enforced against, and any Action that may be based upon, arise out
of or relate to this Agreement, or the negotiation, execution or performance of this Agreement may only be made against, the Persons expressly named as parties hereto; provided, that the Company shall be an express third party beneficiary
with respect to Section 4 and Section 5(b) hereof. 
 15.    Governing Law and Venue; Service of Process;
Waiver of Jury Trial. 
 (a)    This Agreement shall be governed by, and construed in accordance with, the Laws of
the State of Delaware, without giving effect to conflicts of laws principles or rules to the extent such principles or rules are not mandatorily applicable and would require or permit the application of the Law of any jurisdiction other than the
State of Delaware. 
 (b)    In addition, each of the parties (i) consents to submit itself, and hereby submits
itself, to the personal jurisdiction of the Court of Chancery of the State of Delaware or, if such court does not have subject matter jurisdiction, any state or federal court located in New York County in the State of New York having subject matter
jurisdiction, in the event any dispute arises out of this Agreement or any of the transactions contemplated by this Agreement, (ii) agrees that it will not attempt to deny or defeat such personal jurisdiction by motion or other request for
leave from any such court, and agrees not to plead or claim any objection to the laying of venue in any such court or that any judicial proceeding in any such court has been brought in an inconvenient forum, (iii) agrees that it will not bring
any action relating to this 

  
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Agreement or any of the transactions contemplated by this Agreement in any court other than the Court of Chancery of the State of Delaware or, if such court does not have subject matter
jurisdiction, any state or federal court located in New York County in the State of New York having subject matter jurisdiction, and (iv) consents to service of process being made through the notice procedures set forth in Section 11. 

(c)    EACH OF THE PARTIES HEREBY KNOWINGLY, INTENTIONALLY AND VOLUNTARILY IRREVOCABLY WAIVES ANY AND ALL RIGHTS TO TRIAL
BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATED TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY. 

16.    Assignment; Successors. Neither this Agreement nor any of the rights, interests or obligations hereunder
shall be assigned by any of the parties hereto in whole or in part (whether by operation of Law or otherwise) without the prior written consent of the other party, and any such assignment without such consent shall be null and void. This Agreement
shall be binding upon, inure to the benefit of and be enforceable by the parties hereto and their respective successors and permitted assigns. 

17.    Enforcement. The rights and remedies of the parties shall be cumulative with and not exclusive of any other
remedy conferred hereby. The parties agree that irreparable damage would occur and that the parties would not have any adequate remedy at law 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 shall be entitled to an injunction or injunctions to prevent breaches or threatened breaches of this Agreement and to enforce specifically the terms and provisions
of this Agreement, including the Stockholder’s obligations to vote its Covered Shares as provided in this Agreement, in the Court of Chancery of the State of Delaware or, if under applicable law exclusive jurisdiction over such matter is vested
in the federal courts, any state or federal court located in New York County in the State of New York, without proof of actual damages or otherwise (and each party hereby waives any requirement for the securing or posting of any bond in connection
with such remedy), this being in addition to any other remedy to which they are entitled at law or in equity. 

18.    Severability. If any term or other provision of this Agreement is held by a court of competent jurisdiction
or other authority to be invalid, void, unenforceable or against its regulatory policy, the remainder of the terms and provisions of this Agreement shall remain in full force and effect and shall in no way be affected, impaired or invalidated, so
long as the economic and legal substance of the transactions contemplated hereby, taken as a whole, are not affected in a manner materially adverse to any party hereto. Upon such a determination, the parties hereto shall negotiate in good faith to
modify this Agreement so as to effect the original intent of the parties hereto as closely as possible in an acceptable manner in order that the transactions contemplated hereby be consummated as originally contemplated to the fullest extent
possible. 
 19.    Counterparts. This Agreement may be executed in one or more counterparts, all of which shall
be considered one and the same agreement, it being understood that each party need not sign the same counterpart. This Agreement shall become effective when each party shall have received a counterpart hereof signed by all of the other parties.
Signatures delivered electronically or by facsimile shall be deemed to be original signatures. 

  
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 20.    Interpretation and Construction. The words
“hereof,” “herein” and “hereunder” and words of like import used in this Agreement shall refer to this Agreement as a whole and not to any particular provision of this Agreement. The descriptive headings used herein are
inserted for convenience of reference only and are not intended to be part of or to affect the meaning or interpretation of this Agreement. References to Sections are to Sections of this Agreement unless otherwise specified. Any singular term in
this Agreement shall be deemed to include the plural, and any plural term the singular. The definitions contained in this Agreement are applicable to the masculine as well as to the feminine and neuter genders of such term. Whenever the words
“include,” “includes” or “including” are used in this Agreement, they shall be deemed to be followed by the words “without limitation,” whether or not they are in fact followed by those words or words of like
import. “Writing,” “written” and comparable terms refer to printing, typing and other means of reproducing words (including electronic media) in a visible form. References to any statute shall be deemed to refer to such statute
and to any rules or regulations promulgated thereunder. References to any person include the successors and permitted assigns of that person. References from or through any date mean, unless otherwise specified, from and including such date or
through and including such date, respectively. In the event an ambiguity or question of intent or interpretation arises, this Agreement will be construed as if drafted jointly by the Parties, and no presumption or burden of proof will arise favoring
or disfavoring any Party by virtue of the authorship of any of the provisions of this Agreement. 
 21.    Capacity
as a Stockholder. Notwithstanding anything herein to the contrary, the Stockholder signs this Agreement solely in the Stockholder’s capacity as a stockholder of the Company, and not in any other capacity and this Agreement shall not limit
or otherwise affect the actions of any affiliate, employee or designee of the Stockholder or any of its affiliates in his or her capacity, if applicable, as an officer or director of the Company or any other Person. 

[The remainder of this page is intentionally left blank.] 

  
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 IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed (where
applicable, by their respective officers or other authorized Persons thereunto duly authorized) as of the date first written above. 
  

			
		 	MOSAIC ACQUISITION CORP.
		
	By:	 	 /s/ David M. Maura

		 	Name: David M. Maura
		 	 Title: Chairman, President and Chief Executive Officer

		
		 	MAIDEN MERGER SUB, INC.
		
	By:	 	 /s/ David M. Maura

		 	Name: David M. Maura
		 	Title: President and Chief Executive Officer

  
 [Signature Page to
Support Agreement] 

 
			
	 313 ACQUISITION LLC

		
	 By:
	 	 /s/ Alex J. Dunn

	 Name: Alex J. Dunn

	 Title: President

 [Signature Page to Support Agreement] 

 Exhibit A 

WRITTEN CONSENT 
 IN LIEU
OF A 
 MEETING OF STOCKHOLDERS 

OF 
 VIVINT SMART HOME,
INC. 
  
  

[●], 2019 
  

 
 The undersigned
(the “Stockholder”), being the holder of shares of common stock of Vivint Smart Home, Inc., a Delaware corporation, (the “Company”), acting pursuant to Section 228(a) and Section 251 of the General
Corporation Law of the State of Delaware (the “DGCL”), does hereby irrevocably consent to the adoption of the following resolutions in lieu of a meeting with respect to [all of the shares of common stock held by the Stockholder]
[only a number of shares of common stock held by the Stockholder equal to 35.00% of the issued and outstanding shares of common stock of the Company]: 

MERGER AGREEMENT 

WHEREAS, the Company has entered into an Agreement and Plan of Merger, dated as of September [●], 2019 (the “Merger
Agreement”), by and among the Company, Mosaic Acquisition Corp., a Delaware corporation (“Acquiror”) and Maiden Merger Sub, Inc., a Delaware corporation (“Merger Sub”), a copy of which has been provided to
the undersigned Stockholder (capitalized terms used herein without definition shall have the respective meaning ascribed to them in the Merger Agreement); 

WHEREAS, pursuant to the Merger Agreement, Merger Sub will be merged with and into the Company (the “Merger”), with the
Company continuing as the surviving corporation of the Merger, upon the terms and subject to the conditions set forth in the Merger Agreement; 

WHEREAS, the Board has (i) determined that it is in the best interests of the Company and its stockholders, and declared it advisable, to
enter into the Merger Agreement and to consummate the transactions contemplated thereby, including the Merger, (ii) approved the Merger Agreement and the execution, delivery and performance thereof and the consummation of the transactions
contemplated thereby, including the Merger, upon the terms and subject to the conditions set forth in the Merger Agreement, and (iii) subject to Section 6.09 of the Merger Agreement, resolved to recommend the adoption of the Merger
Agreement and the approval of the transactions contemplated thereby, including the Merger, by the holders of the shares of the Company Stock, upon the terms and subject to the conditions set forth therein; and 

 WHEREAS, the affirmative vote in favor of the adoption of the Merger Agreement by a majority
of the votes entitled to be cast thereon by the stockholders of the Company is required pursuant to Section 251 of the DGCL, upon the terms and subject to the conditions set forth in the Merger Agreement; now, therefore, be it 

RESOLVED, that the Merger Agreement and the transactions contemplated thereby, including the Merger, are hereby adopted and
approved in all respects, and the undersigned Stockholder hereby votes [all of the shares of common stock held by the Stockholder] [only a number of shares of common stock held by the Stockholder equal to 35.00% of the issued and outstanding shares
of common stock of the Company] in favor of the adoption and approval of the Merger Agreement and the transactions contemplated thereby, including the Merger; and 

FURTHER RESOLVED, that the undersigned Stockholder hereby waives any and all irregularities of notice, with respect to the time
and place of meeting, and consents to the transaction of all business represented by this written consent. 
 [Remainder of page
intentionally left blank. 
 Signature page follows.] 

  
 2EX-10.19

 Exhibit 10.19 

REGISTRATION RIGHTS AGREEMENT 

This Registration Rights Agreement (as amended from time to time, this “Agreement”) is dated as of
September 15, 2019, and is among Vivint Smart Home, Inc., a Delaware corporation (“Legacy Vivint”), Mosaic Acquisition Corp., a Delaware corporation (“Mosaic”), 313 Acquisition (as defined below)
and each of the other persons identified on Exhibit A hereto and the other persons who enter into a joinder to this Agreement substantially in the form of Exhibit B hereto with the Company in order to become a “Stockholder” for purposes of
this Agreement (313 Acquisition, together with the other signatories hereto and to such joinders, other than the Company, collectively the “Stockholders”, and individually a “Stockholder”). References
to Stockholders in this Agreement also include all of their affiliates (other than portfolio companies) and transferees to whom a Stockholder (or its direct or indirect transferee) transfers shares and related rights under this Agreement in
accordance with Section 6.1 of this Agreement. 
 ARTICLE I 

DEFINITIONS 
 In this
Agreement: 
 “313 Acquisition” means (a) BCP Voyager Holdings LP and (b) (i) 313 Acquisition LLC
and (ii) following the dissolution of 313 Acquisition LLC, collectively, Blackstone Capital Partners VI L.P., Blackstone Family Investment Partnership VI – ESC L.P., Blackstone Family Investment Partnership VI L.P., Blackstone VNT Co-Invest L.P. and their affiliates and related investment vehicles. 
 “313 Acquisition
LLC” means 313 Acquisition LLC, a Delaware limited liability company. 
 “Company” means Mosaic
following the consummation of the Merger, which shall be renamed “Vivint Smart Home, Inc.” 
 “Exchange
Act” means the Securities Exchange Act of 1934, as amended. 
 “Merger” means the merger of
Maiden Merger Sub, Inc., a Delaware corporation and a subsidiary of Mosaic (“Merger Sub”), with and into Legacy Vivint. 

“Merger Agreement” means that certain Agreement and Plan of Merger, dated as of September 15, 2019, by and among
Mosaic, Merger Sub and Legacy Vivint, as it may be amended, supplemented, restated or otherwise modified from time to time. 

“SEC” means the United States Securities and Exchange Commission. 

“Securities Act” means the Securities Act of 1933, as amended. 

 “shares” means shares of common stock of the Company
or any securities of the Company into which the shares are converted or reclassified or for which the shares are exchanged. 

“WKSI” means a well-known seasoned issuer, as defined in the SEC’s Rule 405. 

ARTICLE II 
 DEMAND AND
PIGGYBACK RIGHTS 
 2.1    Right to Demand a Non-Shelf
Registered Offering. Upon the demand of 313 Acquisition made at any time and from time to time, the Company will facilitate in the manner described in this Agreement an underwritten non-shelf
registered offering of the shares requested by 313 Acquisition to be included in such offering. Any demanded non-shelf registered offering may, at the Company’s option, include shares to be sold by the
Company for its own account and will also include shares to be sold by Stockholders that exercise their related piggyback rights on a timely basis in accordance with Section 2.2 hereof. 

2.2    Right to Piggyback on a Non-Shelf Registered Offering.
In connection with any registered underwritten offering of shares covered by a non-shelf registration statement (whether pursuant to the exercise of demand rights or at the initiative of the Company), the
Stockholders may, except as provided in Section 2.6, exercise piggyback rights to have included in such offering shares held by them. The Company will facilitate in the manner described in this
Agreement any such non-shelf registered offering. 
 2.3    Right
to Demand and be Included in a Shelf Registration. Upon the demand of 313 Acquisition made at any time and from time to time when the Company is eligible to utilize Form S-3 or a successor form to sell
shares in a secondary offering on a delayed or continuous basis in accordance with Rule 415, the Company will facilitate in the manner described in this Agreement a shelf registration of shares held by 313 Acquisition. Any shelf registration
statement filed by the Company covering shares (whether pursuant to a demand by 313 Acquisition or at the initiative of the Company) will cover shares held by each of the Stockholders (regardless of whether they demanded the filing of such shelf or
not) up to the highest common percentage of their respective holdings at such time as may be specified by 313 Acquisition in consultation with the other Stockholders (provided that the highest common percentage of shares of each Stockholder
(including 313 Acquisition) covered by such shelf registration statement shall be equal to that of all other Stockholders (including 313 Acquisition)). If at the time of such request the Company is a WKSI, such shelf registration statement would, at
the request of 313 Acquisition, cover an unspecified number of shares to be sold by the Company and the Stockholders. 

2.4    Demand and Piggyback Rights for Shelf Takedowns. Upon the demand of 313 Acquisition made at
any time and from time to time, the Company will facilitate in the manner described in this Agreement a “takedown” of shares off of an effective shelf registration statement. In connection with any underwritten shelf takedown (whether
pursuant to the exercise of such demand rights or at the initiative of the Company), the Stockholders shall be entitled to, and may exercise, piggyback rights to have included in such takedown shares held by 

  
 2 

 
them that are registered on such shelf. Notwithstanding the foregoing, 313 Acquisition may not demand a shelf takedown for an offering that will result in the imposition of a lockup on the
Company and the Stockholders unless the shares requested to be sold by 313 Acquisition in such takedown have an aggregate market value (based on the most recent closing price of the shares at the time of the demand) of at least $50 million.

 2.5    Right to Reload a Shelf. Upon the written request of 313 Acquisition, the Company will
file and seek the effectiveness of a post-effective amendment to an existing shelf in order to register up to the number of shares previously taken down off of such shelf by each of the Stockholders and not yet “reloaded” onto such shelf,
plus a common percentage, as specified by 313 Acquisition, of any additional shares still held by the Stockholders after such “reload” (provided that the common percentage of shares of each Stockholder (including 313 Acquisition) shall be
equal to that of all other Stockholders (including 313 Acquisition)). The Stockholders and the Company will consult and coordinate with each other in order to accomplish such replenishments from time to time in a sensible manner. 

2.6    Limitations on Piggyback Rights 

(a)    Notwithstanding anything in this Agreement to the contrary, the Stockholders will not have piggyback or other
registration rights with respect to registered primary offerings by the Company (i) covered by a Form S-8 registration statement or a successor form applicable to employee benefit-related offers and
sales, (ii) where the shares are not being sold for cash or (iii) where the offering is a rights offering or a bona fide offering of securities other than shares, even if such securities are convertible into or exchangeable or exercisable
for shares. 
 (b)    The Company may postpone the filing of a demanded registration statement or suspend the
effectiveness of any shelf registration statement, or defer initiating the process for a demanded shelf takedown, for a reasonable “blackout period” not in excess of 90 days (and not to exceed an aggregate of 120 days in any 12-month period) if the board of directors of the Company determines that such registration or offering or takedown could materially interfere with a bona fide business or financing transaction of the Company or is
reasonably likely to require premature disclosure of information, the premature disclosure of which could materially and adversely affect the Company. In such event, the Company shall promptly give written notice to the Stockholders that have
requested registration pursuant to Section 2 of its determination to postpone, suspend or defer, as applicable, and, after receipt of such notice, such Stockholders agree to suspend use of the applicable registration statement until the end of
such blackout period. The blackout period will end upon the earlier to occur of, (i) in the case of a bona fide business or financing transaction, a date not later than 90 days from the date such deferral commenced, and (ii) in the case of
disclosure of non-public information, the earlier to occur of (x) the filing by the Company of its next succeeding Form 10-K or Form
10-Q, or (y) the date upon which such information is otherwise disclosed. 

  
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 ARTICLE III 

NOTICES, CUTBACKS AND OTHER MATTERS 

3.1    Prior Consultation and Notifications Regarding Registration Statements. In order for 313
Acquisition to exercise its right to demand that a registration statement be filed, it must so notify the Company in writing indicating the number of shares sought to be registered and the proposed plan of distribution. The Company will keep the
Stockholders contemporaneously apprised of all pertinent aspects of any registration, whether pursuant to a demand by 313 Acquisition or otherwise, with respect to which piggyback rights are available to the Stockholders in accordance with
Section 2. Without limiting the Company’s obligation as described in the preceding sentence, the Stockholders shall be notified by the Company of an anticipated registration statement filing (whether pursuant to a demand made by a
Stockholder or made at the Company’s own initiative) no later than 5:00 pm, New York City time, on the second trading day prior to the date on which the registration statement is expected to be filed. Pending any required public disclosure and
subject to applicable legal requirements, the parties will maintain the confidentiality of these discussions. 

3.2    Notifications Regarding Registration Piggyback Rights. Any Stockholder wishing to exercise its
piggyback rights with respect to a non-shelf registration statement must notify the Company and 313 Acquisition of the number of shares it seeks to have included in such registration statement. Such notice
must be given as soon as practicable, but in no event later than 5:00 pm, New York City time, on the first trading day prior to (i) if applicable, the date on which the preliminary prospectus intended to be used in connection with pre-effective marketing efforts for the relevant offering is expected to be finalized, and (ii) in any case, the date on which the pricing of the relevant offering is expected to occur. No such notice is
required in connection with a shelf registration statement, as shares held by all Stockholders will be included up to the applicable percentage. 

3.3    Notifications Regarding Demanded Underwritten Takedowns 

(a)    The Company will keep the Stockholders contemporaneously apprised of all pertinent aspects of any underwritten shelf
takedown in order that they may have a reasonable opportunity to exercise their related piggyback rights. Without limiting the Company’s obligation as described in the preceding sentence, having a reasonable opportunity requires that the
Stockholders be notified by the Company of an anticipated underwritten takedown (whether pursuant to a demand made by a Stockholder or made at the Company’s own initiative) no later than 5:00 pm, New York City time, on (i) if applicable,
the second trading day prior to the date on which the preliminary prospectus or prospectus supplement intended to be used in connection with pre-pricing marketing efforts for such takedown is finalized, and
(ii) in all cases, the second trading day prior to the date on which the pricing of the relevant takedown occurs. 

(b)    Any Stockholder wishing to exercise its piggyback rights with respect to an underwritten shelf takedown must notify
the Company and the other Stockholders of the number of shares it seeks to have included in such takedown. Such notice must be given as soon as practicable, but in no event later than 5:00 pm, New York City time, on (i) if applicable, the first
trading day prior to the date on which the preliminary prospectus or prospectus supplement 

  
 4 

 
intended to be used in connection with marketing efforts for the relevant offering is expected to be finalized, and (ii) in all cases, the first trading day prior to the date on which the
pricing of the relevant takedown occurs. 
 (c)    Pending any required public disclosure and subject to applicable
legal requirements, the parties will maintain appropriate confidentiality of their discussions regarding a prospective underwritten takedown. 

3.4    Plan of Distribution, Underwriters and Counsel. If a majority of the shares proposed to be
sold in an underwritten offering through a non-shelf registration statement or through a shelf takedown is being sold by the Company for its own account, the Company will be entitled to determine the plan of
distribution and select the managing underwriters for such offering. Otherwise, 313 Acquisition will be entitled to determine the plan of distribution and select the managing underwriters, and 313 Acquisition will also be entitled to select a common
counsel for the selling Stockholders (which may be the same as counsel for the Company). In the case of a shelf registration statement, the plan of distribution will provide as much flexibility as is reasonably possible, including with respect to
resales by transferee Stockholders. 
 3.5    Cutbacks. If the managing underwriters advise the
Company and the selling Stockholders that, in their opinion, the number of shares requested to be included in an underwritten offering exceeds the amount that can be sold in such offering without adversely affecting the distribution of the shares
being offered, such offering will include only the number of shares that the underwriters advise can be sold in such offering. If the Company is selling shares for its own account in such offering, the Company, if so agreed by a majority in interest
of the Stockholders, in the case of a demanded offering, will have first priority. To the extent of any remaining capacity, and in all other cases where the Company is not selling shares in the relevant offering, the selling Stockholders will be
subject to cutback pro rata based on the number of shares initially requested by them to be included in such offering, without distinguishing between Stockholders based on who made the demand for such offering, provided, that, in no event shall any
Stockholder be subject to cutback below such Stockholder’s pro rata percentage. Except as contemplated by Section 6.1(b), shares held by other selling holders who are not Stockholders will be
included in an underwritten offering only with the written consent of Stockholders holding a majority of the shares being sold in such offering and shall only participate to the extent of any remaining capacity after the Company and the Stockholders
have included all of the shares they wish to include in such offering. 
 3.6    Withdrawals. Even
if shares held by a Stockholder have been part of a registered underwritten offering, such Stockholder may, no later than the time at which the public offering price and underwriters’ discount are determined with the managing underwriter,
decline to sell all or any portion of the shares being offered for its account. 
 3.7    Lockups.
In connection with any underwritten offering of shares, the Company and each Stockholder will agree (in the case of Stockholders, with respect to shares respectively held by them) to be bound by the underwriting agreement’s lockup restrictions
(which must apply in like manner to all of them) that are agreed to (a) by the Company, if a majority of the shares being sold in such offering are being sold for its account (provided that such lockup restrictions will not continue for a
period in excess of 90 days (with customary 

  
 5 

 
extensions) unless otherwise agreed by 313 Acquisition), and (b) by Stockholders holding a majority of shares being sold by all Stockholders, if a majority of the shares being sold in such
offering are being sold by Stockholders. For the avoidance of doubt, the Stockholders shall only be subject to such a lockup agreement if 313 Acquisition is also subject to such a lockup agreement (to the extent 313 Acquisition holds shares of the
Company) and any release of 313 Acquisition from its lockup obligations thereunder shall also release the other Stockholders from their lockup obligations thereunder. Pending execution and delivery of the relevant underwriting agreement, upon being
notified of a proposed or requested underwritten offering with respect to which the piggyback rights described in this Agreement will apply, the Stockholders will immediately be bound by the lockup provisions applicable in connection with the Merger
or set forth in the underwriting agreement for the Company’s last underwritten public offering, as the case may be, as though they were then applicable for so long as the proposed or requested offering is being pursued. 

3.8    Expenses. All expenses incurred in connection with any registration statement or registered
offering covering shares held by Stockholders, including, without limitation, all registration and filing fees, printing expenses, fees and disbursements of counsel (including the fees and disbursements of a single outside counsel firm for
Stockholders), providers of capital markets advisory services (which may include affiliates of the Stockholders) and of the independent certified public accountants, and the expense of qualifying such shares under state blue sky laws and any
registration or filing required under the rules of the Financial Industry Regulatory Authority (“FINRA”), will be borne by the Company. Notwithstanding the foregoing, if the counsel for the Stockholders is unable to, or
refuses, to provide a customary selling stockholder legal opinion on behalf of a Stockholder, such Stockholder shall be entitled to select separate outside counsel for purposes of rendering such opinion, and the reasonable fees and disbursements of
such counsel shall be borne by the Company. However, underwriters’, brokers’ and dealers’ discounts and commissions applicable to shares sold for the account of a Stockholder will be borne by such Stockholder. 

ARTICLE IV 

FACILITATING REGISTRATIONS AND OFFERINGS 

4.1    General. If the Company becomes obligated under this Agreement to facilitate a registration
and offering of shares on behalf of Stockholders, the Company will do so with the same degree of care and dispatch as would reasonably be expected in the case of a registration and offering by the Company of shares for its own account. Without
limiting this general obligation, the Company will fulfill its specific obligations as described in this Article IV. 

4.2    Registration Statements. In connection with each registration statement that is demanded by
Stockholders or as to which piggyback rights otherwise apply, the Company will: 
 (a)    (i) prepare and file with the
SEC a registration statement covering the applicable shares, (ii) file amendments thereto as warranted, (iii) seek the effectiveness thereof within a reasonable time, and (iv) file with the SEC prospectuses and prospectus supplements
as may be required, all in consultation with the Stockholders and as reasonably necessary in order to permit the offer and sale of such shares in accordance with the applicable plan of distribution; 

  
 6 

 (b)    (1) within a reasonable time prior to the filing of any
registration statement, any prospectus, any amendment to a registration statement, amendment or supplement to a prospectus or any free writing prospectus, provide copies of such documents to the selling Stockholders and to the underwriter or
underwriters of an underwritten offering, if applicable, and to their respective counsel; fairly consider such reasonable changes in any such documents prior to or after the filing thereof as the counsel to the Stockholders or the underwriter or the
underwriters may request; and make such of the representatives of the Company as shall be reasonably requested by the selling Stockholders or any underwriter available for preparation and discussion of such documents; 

(2)    within a reasonable time prior to the filing of any document which is to be incorporated or deemed incorporated by
reference into a registration statement or a prospectus, provide copies of such document to counsel for the Stockholders and underwriters; fairly consider such reasonable changes in such document prior to or after the filing thereof as counsel for
such Stockholders or such underwriter shall request; and make such of the representatives of the Company as shall be reasonably requested by such counsel available for discussion of such document; 

(c)    use all reasonable efforts to cause each registration statement and the related prospectus and any amendment or
supplement thereto, as of the effective date of such registration statement, amendment or supplement and during the distribution of the registered shares (x) to comply in all material respects with the requirements of the Securities Act and the
rules and regulations of the SEC and (y) not to contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading; 

(d)    notify each Stockholder promptly, and, if requested by such Stockholder, confirm such advice in writing,
(i) when a registration statement has become effective and when any post-effective amendments and supplements thereto become effective if such registration statement or post-effective amendment is not automatically effective upon filing
pursuant to Rule 462, (ii) of the issuance by the SEC or any state securities authority of any stop order, injunction or other order or requirement suspending the effectiveness of a registration statement or the initiation of any proceedings for
that purpose, (iii) if, between the effective date of a registration statement and the closing of any sale of securities covered thereby pursuant to any agreement to which the Company is a party, the representations and warranties of the
Company contained in such agreement cease to be true and correct in all material respects or if the Company receives any notification with respect to the suspension of the qualification of the shares for sale in any jurisdiction or the initiation of
any proceeding for such purpose, and (iv) of the happening of any event during the period a registration statement is effective as a result of which such registration statement or the related Prospectus contains any untrue statement of a
material fact or omits to state any material fact required to be stated therein or necessary to make the statements therein not misleading; 

  
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 (e)    furnish counsel for each underwriter, if any, and for the
Stockholders copies of any correspondence with the SEC or any state securities authority relating to the registration statement or prospectus; 

(f)    otherwise use all reasonable efforts to comply with all applicable rules and regulations of the SEC, including
making available to its security holders an earnings statement covering at least 12 months which shall satisfy the provisions of Section 11(a) of the Securities Act and Rule 158 thereunder (or any similar provision then in force); and 

(g)    use all reasonable efforts to obtain the withdrawal of any order suspending the effectiveness of a registration
statement at the earliest possible time. 
 4.3    Non-Shelf
Registered Offerings and Shelf Takedowns. In connection with any non-shelf registered offering or shelf takedown that is demanded by Stockholders or as to which piggyback rights otherwise apply, the
Company will: 
 (a)    cooperate with the selling Stockholders and the sole underwriter or managing underwriter of an
underwritten offering of shares, if any, to facilitate the timely preparation and delivery of certificates representing the shares to be sold and not bearing any restrictive legends; and enable such shares to be in such denominations (consistent
with the provisions of the governing documents thereof) and registered in such names as the selling Stockholders or the sole underwriter or managing underwriter of an underwritten offering of shares, if any, may reasonably request at least five days
prior to any sale of such shares; 
 (b)    furnish to each Stockholder and to each underwriter, if any, participating
in the relevant offering, without charge, as many copies of the applicable prospectus, including each preliminary prospectus, and any amendment or supplement thereto and such other documents as such Stockholder or underwriter may reasonably request
in order to facilitate the public sale or other disposition of the shares; the Company hereby consents to the use of the prospectus, including each preliminary prospectus, by each such Stockholder and underwriter in connection with the offering and
sale of the shares covered by the prospectus or the preliminary prospectus; 
 (c)    (i) use all reasonable efforts to
register or qualify the shares being offered and sold, no later than the time the applicable registration statement becomes effective, under all applicable state securities or “blue sky” laws of such jurisdictions as each underwriter, if
any, or any Stockholder holding shares covered by a registration statement, shall reasonably request; (ii) use all reasonable efforts to keep each such registration or qualification effective during the period such registration statement is
required to be kept effective; and (iii) do any and all other acts and things which may be reasonably necessary or advisable to enable each such underwriter, if any, and Stockholder to consummate the disposition in each such jurisdiction of
such shares owned by such Stockholder; provided, however, that the Company shall not be obligated to qualify as a foreign corporation or as a dealer in securities in any jurisdiction in which it is not so qualified or to consent to be
subject to general service of process (other than service of process in connection with such registration or qualification or any sale of shares in connection therewith) in any such jurisdiction; 

  
 8 

 (d)    cause all shares being sold to be qualified for inclusion in or
listed on The New York Stock Exchange or any securities exchange or the NASDAQ National Market on which shares issued by the Company are then so qualified or listed if so requested by the Stockholders, or if so requested by the underwriter or
underwriters of an underwritten offering of shares, if any; 
 (e)    cooperate and assist in any filings required to be
made with FINRA and in the performance of any due diligence investigation by any underwriter in an underwritten offering; 

(f)    use all reasonable efforts to facilitate the distribution and sale of any shares to be offered pursuant to this
Agreement, including without limitation by making road show presentations, holding meetings with and making calls to potential investors and taking such other actions as shall be requested by the Stockholders or the lead managing underwriter of an
underwritten offering; and 
 (g)    enter into customary agreements (including, in the case of an underwritten
offering, underwriting and/or advisory agreements in customary form, and including provisions with respect to indemnification and contribution in customary form and consistent with the provisions relating to indemnification and contribution
contained herein) and take all other customary and appropriate actions in order to expedite or facilitate the disposition of such shares and in connection therewith: 

1.    make such representations and warranties to the selling Stockholders and the underwriters, if any, in
form, substance and scope as are customarily made by issuers to underwriters in similar underwritten offerings; 

2.    obtain opinions of counsel to the Company and updates thereof (which counsel and opinions (in form,
scope and substance) shall be reasonably satisfactory to the lead managing underwriter, if any) addressed to each selling Stockholder and the underwriters, if any, covering the matters customarily covered in opinions requested in sales of securities
or underwritten offerings and such other matters as may be reasonably requested by such Stockholders and underwriters; 

3.    obtain “cold comfort” letters and updates thereof from the Company’s independent
certified public accountants addressed to the selling Stockholders, if permissible, and the underwriters, if any, which letters shall be customary in form and shall cover matters of the type customarily covered in “cold comfort” letters to
underwriters in connection with primary underwritten offerings; and 
 4.    to the extent requested and
customary for the relevant transaction, enter into a securities sales agreement with the Stockholders providing for, among other things, the appointment of a representative as agent for the selling Stockholders for the purpose of soliciting
purchases of shares, which agreement shall be customary in form, substance and scope and shall contain customary representations, warranties and covenants. The above shall be done at such times as customarily occur in similar registered offerings or
shelf takedowns. 

  
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 4.4    Due Diligence. In connection with each
registration and offering of shares to be sold by Stockholders, the Company will, in accordance with customary practice, make available for inspection by representatives of the Stockholders and underwriters and any counsel or accountant retained by
such Stockholders or underwriters all relevant financial and other records, pertinent corporate documents and properties of the Company and cause appropriate officers, managers, employees, advisors and accountants of the Company to supply all
information reasonably requested by any such representative, underwriter, counsel or accountant in connection with their due diligence exercise. 

4.5    Information from Stockholders. Each Stockholder that holds shares covered by any registration
statement will furnish to the Company such information regarding itself as is required to be included in the registration statement, including the ownership of shares by such Stockholder and the proposed distribution by such Stockholder of such
shares as the Company may from time to time reasonably request in writing. 
 ARTICLE V 

INDEMNIFICATION 

5.1    Indemnification by the Company. In the event of any registration under the Securities Act by
any registration statement pursuant to rights granted in this Agreement of shares held by Stockholders, the Company will indemnify and hold harmless Stockholders (including such Stockholders’ officers, directors, managers, members, partners,
stockholders and affiliates) and each underwriter of such securities and each other person, if any, who controls any Stockholder or such underwriter within the meaning of the Securities Act, against any losses, claims, damages, expenses, judgments
or liabilities (including legal fees and costs of court), joint or several, to which Stockholders or such underwriter or controlling person may become subject under the Securities Act, common law or otherwise, including any amount paid in settlement
of any litigation commenced or threatened, and shall promptly reimburse such persons, as and when incurred, for any legal or other expenses reasonably incurred by them in connection with investigating any claims and defending any actions, insofar as
such losses, claims, damages, or liabilities (or any actions in respect thereof) arise out of or are based upon any violation or alleged violation by the Company of the Securities Act, any blue sky laws, securities laws or other applicable laws or
rules of any state or country in which such shares are offered and relating to action taken or action or inaction required of the Company in connection with such offering, or arise out of or are based upon any untrue statement or alleged untrue
statement of any material fact (i) contained in any registration statement under which such securities were registered under the Securities Act or any amendment or supplement to any of the foregoing, or in any document incorporated by reference
therein or related document or report, or any issuer free writing prospectus (including any “road show,” whether or not required to be filed with the SEC), or which arise out of or are based upon the omission or alleged omission to state a
material fact required to be stated therein or necessary to make the statements therein not misleading or (ii) contained in any preliminary prospectus, if used prior to the effective date of such registration statement, or in the final
prospectus (as amended or supplemented if the Company shall have filed with the SEC any amendment or supplement to the final prospectus), or which arise out of or are based upon the omission or alleged omission (if so used) to state a 

  
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material fact required to be stated in such prospectus or necessary to make the statements in such prospectus not misleading; and will reimburse Stockholders and each such underwriter and each
such controlling person for any legal or any other expenses reasonably incurred by them in connection with investigating or defending any such loss, claim, damage, or liability; provided, however, that the Company shall not be liable to any
Stockholder or its underwriters or controlling persons in any such case to the extent that any such loss, claim, damage, or liability arises out of or is based upon an untrue statement or alleged untrue statement or omission or alleged omission made
in such registration statement or such amendment or supplement, in reliance upon and in conformity with information furnished to the Company through a written instrument duly executed by such Stockholder or such underwriter specifically for use in
the preparation thereof. 
 5.2    Indemnification by Stockholders. Each Stockholder (as to itself,
severally and not jointly) will indemnify and hold harmless (in the same manner and to the same extent as set forth in Section 5.1) the Company, each director of the Company, each officer of the Company
who shall sign the registration statement, and any person who controls the Company within the meaning of the Securities Act, with respect to any untrue statement or alleged untrue statement in or omission or alleged omission from such registration
statement, or any amendment or supplement to it, or any issuer free writing prospectus or other document, to the extent, but only to the extent, that such untrue statement or omission was made in reliance upon and in conformity with information
furnished to the Company through a written instrument duly executed by such Stockholder specifically regarding such Stockholder for use in the preparation of such registration statement or amendment or supplement; provided that the liability of each
Stockholder pursuant to this Section 5.2 shall not exceed the amount by which the net proceeds received by such Stockholder exceeds the amount of any damages which such Stockholder has otherwise been required to pay by reason of an untrue
statement or omission. 
 5.3    Indemnification Procedures. Promptly after receipt by an
indemnified party of notice of the commencement of any action involving a claim referred to in the preceding Sections of this Article V, the indemnified party will, if a resulting claim is to be made or may be made against an indemnifying party,
give written notice to the indemnifying party of the commencement of the action. The failure of any indemnified party to give notice shall not relieve the indemnifying party of its obligations in this Article V, except to the extent that the
indemnifying party is actually and materially prejudiced by the failure to give notice. If any such action is brought against an indemnified party, the indemnifying party will be entitled to participate in and to assume the defense of the action
with counsel reasonably satisfactory to the indemnified party, and after notice from the indemnifying party to such indemnified party of its election to assume defense of the action, the indemnifying party will not be liable to such indemnified
party for any legal or other expenses incurred by the latter in connection with the action’s defense. An indemnified party shall have the right to employ separate counsel in any action or proceeding and participate in the defense thereof, but
the fees and expenses of such counsel shall be at such indemnified party’s expense unless (a) the employment of such counsel has been specifically authorized in writing by the indemnifying party, which authorization shall not be
unreasonably withheld, (ii) the indemnifying party has not assumed the defense and employed counsel reasonably satisfactory to the indemnified party within 30 days after notice of any such action or proceeding, or (iii) the named parties
to any such action or proceeding (including any impleaded parties) include the indemnified party and the indemnifying party and 

  
 11 

 
the indemnified party shall have been advised by such counsel that there may be one or more legal defenses available to the indemnified party that are different from or additional to those
available to the indemnifying party (in which case the indemnifying party shall not have the right to assume the defense of such action or proceeding on behalf of the indemnified party), it being understood, however, that the indemnifying party
shall not, in connection with any one such action or separate but substantially similar or related actions in the same jurisdiction arising out of the same general allegations or circumstances, be liable for the reasonable fees and expenses of more
than one separate firm of attorneys (in addition to all local counsel which is necessary, in the good faith opinion of both counsel for the indemnifying party and counsel for the indemnified party in order to adequately represent the indemnified
parties) for the indemnified party and that all such fees and expenses shall be reimbursed as they are incurred upon written request and presentation of invoices. Whether or not a defense is assumed by the indemnifying party, the indemnifying party
will not be subject to any liability for any settlement made without its consent (but such consent will not be unreasonably withheld). No indemnifying party will consent to entry of any judgment or enter into any settlement which (i) does not
include as an unconditional term the giving by the claimant or plaintiff, to the indemnified party, of a release from all liability in respect of such claim or litigation, (ii) involves the imposition of equitable remedies or the imposition of
any non-financial obligations on the indemnified party, (iii) includes a statement about or an admission of fault, culpability or a failure to act by or on behalf of any indemnified party or
(iv) commits any indemnified party to take, or hold back from taking, any action. 

5.4    Contribution. If the indemnification required by this Article V from the indemnifying party is
unavailable to or insufficient to hold harmless an indemnified party in respect of any indemnifiable losses, claims, damages, liabilities, or expenses, then the indemnifying party shall contribute to the amount paid or payable by the indemnified
party as a result of such losses, claims, damages, liabilities, or expenses in such proportion as is appropriate to reflect (i) the relative benefit of the indemnifying and indemnified parties and (ii) if the allocation in clause
(i) is not permitted by applicable law, in such proportion as is appropriate to reflect the relative benefit referred to in clause (i) and also the relative fault of the indemnified and indemnifying parties, in connection with the actions
which resulted in such losses, claims, damages, liabilities, or expenses, as well as any other relevant equitable considerations. The relative benefits received by a party shall be deemed to be in the same proportion as the total net proceeds from
the offering (before deducting expenses) received by it bear to the total amounts (including, in the case of any underwriter, any underwriting commissions and discounts) received by each other party. The relative fault of the indemnifying party and
the indemnified party shall be determined by reference to, among other things, whether any action in question, including any untrue or alleged untrue statement of a material fact or omission or alleged omission to state a material fact, has been
made by, or relates to information supplied by, such indemnifying party or parties, and the parties’ relative intent, knowledge, access to information, and opportunity to correct or prevent such action. The amount paid or payable by a party as
a result of the losses, claims, damage, liabilities, and expenses referred to above shall be deemed to include any legal or other fees or expenses reasonably incurred by such party in connection with any investigation or proceeding. The Company and
the Stockholders agree that it would not be just and equitable if contribution pursuant to this Section 5.4 were determined by pro rata allocation or by any other method of allocation which does not
take account of the equitable considerations referred to in the prior provisions of this Section 5.4. 

  
 12 

 Notwithstanding the provisions of this
Section 5.4, no indemnifying party shall be required to contribute any amount in excess of the amount by which the net proceeds received from the sale of the securities by the indemnifying party exceeds
the amount of any damages which the indemnifying party has otherwise been required to pay by reason of an untrue statement or omission. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act)
shall be entitled to contribution from any person who was not guilty of such a fraudulent misrepresentation. 
 ARTICLE VI 

OTHER AGREEMENTS 

6.1    Transfer of Rights. 

(a)    Any Stockholder may transfer all or any portion of its rights under this Agreement to any transferee of shares held
by such Stockholder, which transfer is otherwise permissible under the agreements by which such Stockholder is bound. Any such transfer of registration rights will be effective upon receipt by the Company of (i) written notice from such
Stockholder stating the name and address of any transferee Stockholder and identifying the number of shares with respect to which rights under this Agreement are being transferred and the nature of the rights so transferred, and (ii) a written
agreement from such transferee Stockholder to be bound by the terms of this Agreement. However, if such transferees are receiving shares through an in-kind distribution with an ability to resell shares off of
a shelf registration statement, no such written agreement is required, and such in-kind transferees will, as transferee Stockholders, be entitled as third party beneficiaries to the rights under this Agreement
so transferred. In that regard, in kind transferees will not be given demand or piggyback rights; rather, their means of registered resale will be limited to sales off a shelf with respect to which no special actions are required by the Company or
the other Stockholders. The Company and the transferring Stockholder will notify the other Stockholders as to who the transferees are and the nature of the rights so transferred. 

(b)    In the event the Company engages in a merger or consolidation in which the shares are converted into securities of
another company, appropriate arrangements will be made so that the registration rights provided under this Agreement continue to be provided to Stockholders by the issuer of such securities. To the extent such new issuer, or any other company
acquired by the Company in a merger or consolidation, was bound by registration rights obligations that would conflict with the provisions of this Agreement, the Company will, unless Stockholders then holding a majority of the shares otherwise agree
in writing, use its best efforts to modify any such “inherited” registration rights obligations so as not to interfere in any material respects with the rights provided under this Agreement. 

(c)    In addition, in the event that the Company effects the separation of any portion of its business into one or more
entities (each, a “NewCo”), whether existing or newly formed, including without limitation by way of spin-off, split-off, carve-out, demerger, recapitalization, reorganization or similar transaction, and any Stockholder will receive equity interests in any such NewCo as part of such separation, the Company shall cause any such NewCo to
enter into a registration rights agreement with each such Stockholder that provides each such Stockholder with registration rights vis-à-vis such NewCo that are
substantially identical to those set forth in this Agreement. 

  
 13 

 6.2    Limited Liability. Notwithstanding any other
provision of this Agreement, neither the members, stockholders, general partners, limited partners, advisory directors or managing directors, or any directors or officers of any members, stockholders, general or limited partners, advisory directors
or managing directors, nor any future members, stockholders, general partners, limited partners, advisory directors, or managing directors, if any, of any Stockholder shall have any personal liability for performance of any obligation of such
Stockholder under this Agreement in excess of the respective capital contributions of such members, stockholders, general partners, limited partners, advisory directors or managing directors to such Stockholder. 

6.3    Rule 144. If the Company is subject to the requirements of Section 13, 14 or 15(d) of the
Exchange Act, the Company covenants that it will file any reports required to be filed by it under the Securities Act and the Exchange Act (or, if the Company is subject to the requirements of Section 13, 14 or 15(d) of the Exchange Act but is
not required to file such reports, it will, upon the request of any Stockholder, make publicly available such information) and it will take such further action as any Stockholder may reasonably request, including the removal of any restrictive
legends on shares, so as to enable such Stockholder to sell shares without registration under the Securities Act within the limitation of the exemptions provided by (a) Rule 144 under the Securities Act, as such Rule may be amended from
time to time, or (b) any similar rule or regulation hereafter adopted by the SEC. Upon the request of any Stockholder, the Company will deliver to such Stockholder a written statement as to whether it has complied with such requirements. 

6.4    In-Kind Distributions. If any Stockholder seeks to
effectuate an in-kind distribution of all or part of its shares to its direct or indirect equityholders, which distribution is otherwise permissible under the agreements by which such Stockholder is bound, the
Company will, subject to applicable lockups, work with such Stockholder and the Company’s transfer agent to facilitate such in-kind distribution in the manner reasonably requested by such Stockholder,
subject to applicable legal and regulatory requirements. 
 ARTICLE VII 

MISCELLANEOUS 

7.1    Notices. All notices, requests, demands and other communications required or permitted
hereunder shall be made in writing by hand-delivery, registered first-class mail, e-mail, fax or reputable courier guaranteeing delivery: 

If to the Company, to: 
 Vivint Smart Home, Inc.

 4931 North 300 West 
 Provo,
Utah 84604 
 Facsimile: (801) 377-4116 

  
 14 

 Attention: Chief Legal Officer 

with a copy to: 
 Simpson
Thacher & Bartlett LLP 
 425 Lexington Avenue 

New York, New York 10017-3954 

Facsimile: 212-455-2502 

Attn: Igor Fert 
 E-mail: ifert@stblaw.com 
 or to such other person or address as the Company shall furnish to the Stockholders in
writing; 
 If to 313 Acquisition, to: 

313 Acquisition LLC 
 c/o The
Blackstone Group Inc. 
 345 Park Avenue 

New York, New York 10154 

Attention: Bruce McEvoy 

                 Peter Wallace 

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

Simpson Thacher & Bartlett LLP 

425 Lexington Avenue 
 New York,
NY 10017-3954 
 Attn: Igor Fert 

Fax: (212) 455-2502 

E-mail: ifert@stblaw.com 

or to such other person or address as 313 Acquisition shall furnish to the Company and the other Stockholders in writing; 

If to any other Stockholder, to such address as such Stockholder shall furnish to the Company and the other Stockholders in writing. 

All such notices, requests, demands and other communications shall be deemed to have been duly given: at the time of delivery by hand, if
personally delivered; five business days after being deposited in the mail, postage prepaid, if mailed domestically in the United States (and seven Business Days if mailed internationally); when receipt acknowledged, if e-mailed or sent by fax; and on the business day for which delivery is guaranteed, if timely delivered to a reputable courier guaranteeing such delivery. 

7.2    Section Headings. The article and section headings in this Agreement are for reference
purposes only and shall not affect the meaning or interpretation of this Agreement. References in this Agreement to a designated “Article” or “Section” refer to an Article or Section of this Agreement unless otherwise
specifically indicated. 

  
 15 

 7.3    Governing Law. This Agreement shall be
governed by and construed in accordance with the laws of the State of New York. 
 7.4    Waiver of Jury
Trial. Each of the parties hereto hereby irrevocably waives any and all right to trial by jury in any legal proceeding arising out of or related to this Agreement or the transactions contemplated hereby. 

7.5    Consent to Jurisdiction and Service of Process. The parties to this Agreement hereby agree to
submit to the jurisdiction of the courts of the State of New York sitting in Manhattan, the courts of the United States of America for the Southern District of New York, and appellate courts from any thereof in any action or proceeding arising out
of or relating to this Agreement. 
 7.6    Amendments. This Agreement may be amended only by an
instrument in writing executed by the Company and the Stockholders holding a majority of the shares collectively held by them; provided, that any amendment that diminishes the rights of a Stockholder in any respect shall require the written consent
of such Stockholder. Any such amendment will apply to all Stockholders equally, without distinguishing between them. This Agreement will terminate as to any Stockholder when it no longer holds any shares. 

7.7    Effectiveness; Termination of Existing Registration Rights. This Agreement shall
be valid and enforceable as of the date of this Agreement and may not be revoked by any party hereto; provided that the provisions herein (other than this Article VII) shall not be effective until the consummation of the Merger. In the event the
Merger Agreement is terminated in accordance with its terms, this Agreement shall automatically terminate and be of no further force or effect. Upon the consummation of the Merger, the registration rights granted under this Agreement shall supersede
any registration, qualification or similar rights of the Stockholders with respect to any of the shares or any securities of Mosaic, Legacy Vivint or the Company, or their respective subsidiaries or parents, as applicable, granted under any other
agreement (other than the securityholders agreement of 313 Acquisition LLC), including each of the agreements set forth in Exhibit C hereto, and any of such preexisting registration, qualification or similar rights and such agreements shall be
terminated and of no further force and effect. 
 7.8    Entire Agreement. This Agreement
constitutes the entire agreement and understanding of the parties with respect to the transactions contemplated hereby and thereby. 

7.9    Severability. The invalidity or unenforceability of any specific provision of this Agreement
shall not invalidate or render unenforceable any of its other provisions. Any provision of this Agreement held invalid or unenforceable shall be deemed reformed, if practicable, to the extent necessary to render it valid and enforceable and to the
extent permitted by law and consistent with the intent of the parties to this Agreement. 

  
 16 

 7.10    Counterparts. This Agreement may be
executed in multiple counterparts, including by means of facsimile or electronic signature, each of which shall be deemed an original, but all of which together shall constitute the same instrument. 

[Remainder of page intentionally left blank. Signature page follows.] 

  
 17 

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

			
	VIVINT SMART HOME, INC.
		
	By:	 	 /s/ Alex J. Dunn

		 	Name: Alex J. Dunn
		 	Title: President

 [Signature Page to Registration Rights Agreement] 

 
			
	MOSAIC ACQUISITION CORP.
		
	By:	 	 /s/ David M. Maura

		 	Name: David M. Maura
		 	 Title: Chairman, President and Chief Executive Officer

 [Signature Page to Registration Rights Agreement] 

 
			
	313 ACQUISITION LLC
		
	By:	 	 /s/ Alex J. Dunn

		 	Name: Alex J. Dunn
		 	Title: President

 [Signature Page to Registration Rights Agreement] 

 
			
	DRAWBRIDGE SPECIAL OPPORTUNITIES FUND LP
		
		 	By: Drawbridge Special Opportunities GP, LLC its General Partner
		
	By:	 	/s/ Marc Furstein 
		 	Name: Marc Furstein
		 	Title: Chief Operating Officer

  
 [Signature Page to
Registration Rights Agreement] 

 
			
	FORTRESS MOSAIC ANCHOR LLC
		
	By:	 	/s/ Constantine M. Dakolias 
		 	Name: Constantine M. Dakolias
		 	Title: President

  
 [Signature Page to
Registration Rights Agreement] 

 
			
	FORTRESS MOSAIC INVESTOR LLC
		
	By:	 	/s/ Constantine M. Dakolias 
		 	Name: Constantine M. Dakolias
		 	Title: President

  
 [Signature Page to
Registration Rights Agreement] 

 
			
	FORTRESS MOSAIC SPONSOR LLC
		
	By:	 	/s/ Constantine M. Dakolias 
		 	Name: Constantine M. Dakolias
		 	Title: President

  
 [Signature Page to
Registration Rights Agreement] 

 
			
	BLACKSTONE CAPITAL PARTNERS VI L.P.
		
		 	By: BLACKSTONE MANAGEMENT ASSOCIATES VI L.L.C., its general partner
		
		 	By: BMA VI L.L.C., its sole member
		
	By:	 	/s/ Peter Wallace 
		 	Name: Peter Wallace
		 	Title: Senior Managing Director

  
 [Signature Page to
Registration Rights Agreement] 

 
			
	BLACKSTONE FAMILY INVESTMENT PARTNERSHIP VI – ESC L.P.
		
		 	By: BCP VI SIDE-BY SIDE GP L.L.C. its general partner
		
	By:	 	/s/ Peter Wallace 
		 	Name: Peter Wallace
		 	Title: Senior Managing Director

  
 [Signature Page to
Registration Rights Agreement] 

 
			
	BLACKSTONE FAMILY INVESTMENT PARTNERSHIP VI L.P.
		
		 	By: BCP VI SIDE-BY SIDE GP L.L.C. its general partner
		
	By:	 	/s/ Peter Wallace 
		 	Name: Peter Wallace
		 	Title: Senior Managing Director

  
 [Signature Page to
Registration Rights Agreement] 

 
			
	 BLACKSTONE VNT CO-INVEST
L.P.

		
		 	By: BLACKSTONE MANAGEMENT ASSOCIATES VI L.L.C., its general partner
		
		 	By: BMA VI L.L.C., its sole member
		
	By:	 	/s/ Peter Wallace 
		 	 Name: Peter Wallace

		 	 Title: Senior Managing Director

  
 [Signature Page to
Registration Rights Agreement] 

 
			
	 BCP VOYAGER HOLDINGS LP

		
		 	By: BLACKSTONE MANAGEMENT ASSOCIATES VI L.L.C., its general partner
		
		 	By: BMA VI L.L.C., its sole member
		
	By:	 	/s/ Peter Wallace 
		 	 Name: Peter Wallace

		 	 Title: Senior Managing Director

  
 [Signature Page to
Registration Rights Agreement] 

 
			
	MOSAIC SPONSOR, LLC
		
	By:	 	/s/ David M. Maura 
		 	Name: David M. Maura
		 	Title: Chief Executive Officer

  
 [Signature Page to
Registration Rights Agreement] 

 
			
	SOLAMERE V INVESTMENTS, LLC
		
		 	By: Solamere Capital Fund II, LP
		 	 Its: Managing Member

		
		 	By: Solamere Capital Fund II GP, LP
		 	 Its: General Partner

		
		 	By: Solamere Group, LLC
		 	 Its: General Partner

		
	By:	 	/s/ Eric F. Scheuermann 
		 	Name: Eric F. Scheuermann
		 	Title: Managing Member

  
 [Signature Page to
Registration Rights Agreement] 

 
			
	RIVENDELL INVESTMENTS 2016-5 LLC
		
	By:	 	/s/ Joel Cazares 
		 	Name: Joel Cazares
		 	Title: Authorized Signatory

  
 [Signature Page to
Registration Rights Agreement] 

 
			
	SUMMIT PARTNERS GROWTH EQUITY FUND VIII-A, L.P.
		
		 	By: Summit Partners GE VIII, L.P., its General Partner
		
		 	 By: Summit Partners GE VIII, LLC, its

		 	 Managing Member

		
	By:	 	/s/ Peter Y. Chung 
		 	Name: Peter Y. Chung
		 	Title: Authorized Signatory

  
 [Signature Page to
Registration Rights Agreement] 

 
			
	SUMMIT PARTNERS GROWTH EQUITY FUND VIII-B, L.P.
		
		 	By: Summit Partners GE VIII, L.P., its General Partner
		
		 	By: Summit Partners GE VIII, LLC, its
Managing Member
		
	By:	 	/s/ Peter Y. Chung 
		 	Name: Peter Y. Chung
		 	Title: Authorized Signatory

  
 [Signature Page to
Registration Rights Agreement] 

 
			
	SUMMIT INVESTORS I, LLC
		
	By:	 	Summit Investors Management, LLC, its Manager
		
		 	By: Summit Partners, L.P., its Manager
		
		 	By: Summit Master Company, LLC its General Partner
		
	By:	 	/s/ Peter Y. Chung 
		 	Name: Peter Y. Chung
		 	Title: Authorized Signatory

  
 [Signature Page to
Registration Rights Agreement] 

 
			
	SUMMIT INVESTORS I (UK), L.P.
		
	By: 	 	Summit Investors Management, LLC, its General Partner
		
		 	By: Summit Partners, L.P., its Manager
		
		 	By: Summit Master Company, LLC its General Partner
		
	By:	 	/s/ Peter Y. Chung 
		 	Name: Peter Y. Chung
		 	Title: Authorized Signatory

  
 [Signature Page to
Registration Rights Agreement] 

 
			
	BLACK HORSE HOLDINGS, LLC
		
	By:	 	/s/ Eric F. Scheuermann 
		 	Name: Eric. F. Scheuermann
		 	Title: Managing Member

  
 [Signature Page to
Registration Rights Agreement] 

 
			
	TODD PEDERSEN
		
	By:	 	/s/ Todd Pedersen 

  
 [Signature Page to
Registration Rights Agreement] 

 
			
	THE PEDERSEN FAMILY TRUST
		
	By:	 	/s/ Michael Cahill 
		 	Name: Michael Cahill
		 	Title: Trustee

  
 [Signature Page to
Registration Rights Agreement] 

 
			
	ALEX DUNN
		
	By:	 	/s/ Alex J. Dunn 

  
 [Signature Page to
Registration Rights Agreement] 

 Exhibit A 

Drawbridge Special Opportunities Fund LP 
 Fortress Mosaic Anchor
LLC 
 Fortress Mosaic Investor LLC 
 Fortress Mosaic Sponsor
LLC 
 Blackstone Capital Partners VI L.P. 
 Blackstone Family
Investment Partnership VI – ESC L.P. 
 Blackstone Family Investment Partnership VI L.P. 

Blackstone VNT Co-Invest L.P. 

BCP Voyager Holdings LP 
 Mosaic Sponsor, LLC 

Solamere V Investment, LLC 
 Rivendell Investments 2016-5 LLC 
 Summit Partners Growth Equity Fund VIII-A, L.P. 

Summit Partners Growth Equity Fund VIII-B, L.P. 

Summit Investors I, LLC 
 Summit Investors I (UK), L.P. 

Black Horse Holdings, LLC 
 Todd Pedersen 

The Pedersen Family Trust 
 Alex Dunn 

 Exhibit B 

FORM OF JOINDER TO REGISTRATION RIGHTS AGREEMENT 

[            ], 20     

Reference is made to the Registration Rights Agreement, dated as of September 15, 2019, by and among Vivint Smart Home, Inc., Mosaic Acquisition Corp.
and the Stockholders (as defined therein) from time to time party thereto (as amended from time to time, the “Registration Rights Agreement”). Capitalized terms used but not otherwise defined herein shall have the meanings ascribed
to such terms in the Registration Rights Agreement. 
 Each of the Company and each undersigned holder of shares of the Company (each, a “New
Stockholder”) agrees that this Joinder to the Registration Rights Agreement (this “Joinder”) is being executed and delivered for good and valuable consideration. 

Each undersigned New Stockholder hereby agrees to and does become party to the Registration Rights Agreement as a Stockholder and agrees that the registration
rights granted under the Registration Rights Agreement supersede any registration, qualification or similar rights with respect to any of the shares of or any securities of the Company’s subsidiaries or parents, as applicable, granted under any
other agreement, and any of such preexisting registration rights of New Stockholder are hereby terminated. This Joinder shall serve as a counterpart signature page to the Registration Rights Agreement and by executing below each undersigned New
Stockholder is deemed to have executed the Registration Rights Agreement with the same force and effect as if originally named a party thereto. 
 This
Joinder may be executed in multiple counterparts, including by means of facsimile or electronic signature, each of which shall be deemed an original, but all of which together shall constitute the same instrument. 

[Remainder of Page Intentionally Left Blank.] 

 IN WITNESS WHEREOF, the undersigned have duly executed this joinder as of the date first set forth above.

  

			
	[NEW STOCKHOLDER]
		
	By:	 	  

		 	Name:
		 	Title
	
	[COMPANY]
		
	By:	 	  

		 	Name:
		 	Title:

 Exhibit C 

Registration Rights Agreement, dated as of April 25, 2016, among Vivint Smart Home, Inc. (f/k/a APX Parent Holdco, Inc.) and the other parties thereto

 Registration Rights Agreement, dated as of October 18, 2017, among Mosaic Acquisition Corp., Mosaic Sponsor, LLC and Fortress Mosaic Sponsor LLC

 Forward Purchase Agreement, dated as of September 26, 2017, among Mosaic Acquisition Corp., Mosaic Sponsor, LLC, Fortress Mosaic Sponsor LLC and the
other parties thereto.

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