Exhibit 10.1

Subscription Agreement

December 18, 2019

Mosaic Acquisition Corp.

375 Park Avenue

New York, NY 10152

Mosaic Sponsor, LLC

375 Park Avenue

New York, NY 10152

Vivint Smart Home, Inc.

4931 North 300 West

Provo, UT 84604

Ladies and Gentlemen:

WHEREAS, in connection with the proposed business combination (the “Transaction”) between Mosaic Acquisition Corp., a Delaware corporation (the “Company”), Maiden Merger Sub, Inc., a Delaware corporation, and Vivint Smart Home, Inc., a Delaware corporation (“Voyager”), pursuant to an Agreement and Plan of Merger, dated as of September 15, 2019, among the Company, Merger Sub and Voyager (as may be amended and/or restated, including by that certain Amendment No. 1 being entered into concurrently with the execution of this Agreement, the “Transaction Agreement”), the Company proposes to issue and sell to Fayerweather Fund Eiger, L.P. (the “Subscriber”), 5,000,000 shares of the Company’s Class A common stock, par value $0.0001 per share (the “Class A Common Stock”), in a private placement transaction (such transaction, the “Subscription”). The Subscriber shall be entitled to purchase the full Subscription on the terms and conditions herein, which shall not be reduced or amended without the consent of the Subscriber.

NOW, THEREFORE, the Subscriber, the Company, Voyager and Mosaic Sponsor, LLC (the “Sponsor”) agree as follows (this “Agreement”):

1. Subscription. Subject to the terms and conditions hereof, the Subscriber hereby agrees to subscribe for and purchase, and the Company hereby agrees to issue and sell to the Subscriber, 5,000,000 shares of Class A Common Stock (the “Shares”) for an aggregate purchase price of $50,000,000.00 (the “Subscription Amount”). Notwithstanding anything in this Agreement to the contrary but subject to the following proviso, in the event the Closing occurs and the Subscription Amount is funded in accordance with Section 2 below, the Subscriber shall have no liability for any claims or losses arising out of this Agreement; provided, in the event the Subscription Amount is not funded in accordance with Section 2 below, the Subscriber’s liability for any claims or losses arising out of this Agreement shall be limited to the Subscription Amount.

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2. Closing. The closing of the sale of Shares (the “Closing”) contemplated under this Agreement shall occur on the date of, and immediately prior to, the consummation of the Transaction. Upon written notice from (or on behalf of) the Company to the Subscriber (the “Closing Notice”) at least two days (or, if earlier, a date designated by Voyager) prior to the date that the Company expects all conditions to the closing of the Transaction to be satisfied (the “Expected Closing Date”; the date on which the Closing actually occurs, the “Closing Date”), the Subscriber shall deliver to an account of a third-party escrow agent, which is the Company’s transfer agent (the “Escrow Agent”), within one Business Day after receiving the Closing Notice, the Subscription Amount by wire transfer of United States dollars in immediately available funds. On the Closing Date, upon (i) satisfaction of the conditions set forth in Section 3 below and (ii) the receipt by the Company of the Subscription Amount from the Escrow Agent, the Company shall deliver the Shares in certificated or book entry form to the Subscriber or to a custodian designated by the Subscriber, as applicable. In the event the closing of the Transaction does not occur within ten (10) Business Days of the Expected Closing Date, the Company shall (or direct the Escrow Agent to) promptly (but no later than ten (10) Business Days thereafter) return the Subscription Amount to the Subscriber by wire transfer of United States dollars in immediately available funds to the account specified by the Subscriber, and any book entries shall be deemed cancelled. Notwithstanding such return or cancellation, (A) a failure to close on the Expected Closing Date shall not, by itself, be deemed to be a failure of any of the conditions to Closing set forth in Section 3 of this Agreement to be satisfied or waived on or prior to the Closing, and (B) the Subscriber shall still be obligated to consummate the Closing upon (I) satisfaction of the conditions set forth in Section 3 below and (II) the Company’s delivery to the Subscriber of a new Closing Notice.

3. Closing Conditions.

(a) The obligation of the Subscriber, on the one hand, and the Company, on the other hand, to effect the Closing is subject to the satisfaction or written waiver by the Subscriber and the Company prior to the Closing of the following conditions:

(i) there shall not have been enacted or promulgated any order, judgment, injunction, decree, writ, stipulation, determination or award, in each case, entered by or with any court or governmental agency or body, domestic or foreign, nor any statute, rule or regulation, in either case, enjoining or prohibiting the consummation of the Subscription; and

(ii) the Transaction as set forth in the Transaction Agreement shall have been consummated substantially concurrently with the Closing.

(b) The obligation of the Subscriber to effect the Closing is also subject to the satisfaction or written waiver by the Subscriber prior to the Closing of the following conditions:

(i) all representations and warranties of the Company contained in this Agreement shall be true and correct in all material respects (other than representations and warranties that are qualified as to materiality or Company Material Adverse Effect (as defined herein), which representations and warranties shall be true in all respects) at and as of the date hereof and the Closing Date, and consummation of the Closing shall constitute a reaffirmation by the Company of each of the representations, warranties and agreements of the Company contained in this Agreement as of the Closing Date, but in each case without giving effect to consummation of the Transaction; provided, in the event this condition would otherwise fail to be satisfied as a result of a breach of one or more of the representations and warranties of the

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Company contained in this Agreement and the facts underlying such breach would also cause a condition to Voyager’s obligations under the Transaction Agreement to fail to be satisfied, this condition shall nevertheless be deemed satisfied in the event Voyager waives such breach under the Transaction Agreement; and

(ii) no amendment or modification of the Transaction Agreement (as the same exists on the date hereof as provided to the Subscriber) shall have occurred that would reasonably be expected to materially and adversely affect the economic benefits that the Subscriber would reasonably expect to receive under this Agreement, unless the Subscriber has consented in writing to such amendment or modification.

(c) The obligation of the Company to effect the Closing is also subject to the satisfaction or written waiver by either the Company or Voyager prior to the Closing of the following condition:

(i) all representations and warranties of the Subscriber contained in this Agreement shall be true and correct in all material respects at and as of the date hereof and the Closing Date, and consummation of the Closing shall constitute a reaffirmation by the Subscriber of each of the representations, warranties and agreements of the Subscriber contained in this Agreement as of the Closing Date, but in each case without giving effect to consummation of the Transaction.

4. Further Assurances. At the Closing, the parties hereto shall execute and deliver such additional documents and take such additional actions as the parties reasonably may deem to be practical and necessary in order to consummate the subscription as contemplated by this Agreement.

5. Company Representations and Warranties. The Company represents and warrants to the Subscriber that:

(a) The Company is duly incorporated and is validly existing as a corporation in good standing under the laws of Delaware and has the corporate power and authority to own, lease or operate its assets and properties and to conduct its business as it is now being conducted.

(b) The Shares have been duly authorized and, when issued and delivered to the Subscriber against full payment therefor in accordance with the terms of this Agreement, the Shares will be validly issued, fully paid and non-assessable and will not have been issued in violation of or subject to any preemptive or similar rights created under the Company’s Certificate of Incorporation or under the laws of the State of Delaware.

(c) This Agreement has been duly authorized, executed and delivered by the Company and is enforceable 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) The issuance and sale of the Shares and the performance by the Company of this Agreement and the consummation of the transactions herein will not conflict with or result in a breach or violation of any of the terms or provisions of, or constitute a default under, or result in the creation or imposition of any lien, charge or encumbrance upon any of the property or assets of the Company or any of its subsidiaries pursuant to the terms of, (i) any indenture, mortgage, deed of trust, loan agreement, lease, license or other agreement or instrument to which the Company or any of its subsidiaries is a party or by which the Company or any of its subsidiaries is bound or to which any of the property or assets of the Company is subject, which would have a material adverse effect on the ability of the Company to consummate the transactions herein (a “Company Material Adverse Effect”); (ii) result in any violation of the provisions of the organizational documents of the Company; or (iii) result in any violation of any statute or any judgment, order, rule or regulation of any court or governmental agency or body, domestic or foreign, having jurisdiction over the Company or any of its properties that would have a Company Material Adverse Effect.

(e) There are no securities or instruments issued by or to which the Company is a party containing anti-dilution or similar provisions that will be triggered by the issuance of (i) the Shares, or (ii) the securities to be issued pursuant to any other subscription agreement with investors that have agreed to purchase securities in connection with the Transaction, that have not been or will be waived on or prior to the Closing Date.

(f) The Company has not entered into any agreement or arrangement entitling any agent, broker, investment banker, financial advisor or other person to any broker’s or finder’s fee or any other commission or similar fee in connection with the transactions contemplated by this Agreement for which the Subscriber could become liable (it being understood that the Subscriber will effectively bear its pro rata share of any such expenses indirectly as a result of its investment in the Company).

(g) As of the date of this Agreement, the authorized capital stock of the Company consists of 221,000,000 shares of capital stock, consisting of (i) 200,000,000 shares of Class A Common Stock, (ii) 20,000,000 shares of Class F Common Stock, par value $0.0001 per share, and (iii) 1,000,000 shares of Preferred Stock. As of the date of this Agreement, the issued and outstanding capital stock of the Company consists of 43,125,000 shares of capital stock, consisting of (A) 34,500,000 shares of Class A Common Stock, (B) 8,625,000 shares of Class F Common Stock, and (C) no shares of Preferred Stock. As of the date of this Agreement, the Company has 17,433,334 warrants outstanding, each such warrant entitling the holder thereof to purchase one (1) share of Class A Common Stock.

6. Subscriber Representations and Warranties. The Subscriber represents and warrants to the Company that:

(a) The Subscriber is (i) a “qualified institutional buyer” (as defined in Rule 144A (“Rule 144A”) under the Securities Act of 1933 as amended (the “Securities Act”)) or (ii) an institutional “accredited investor” (within the meaning of Rule 501(a) under the Securities Act), in each case, satisfying the requirements set forth on Schedule A, and is acquiring the Shares only for his, her or its own account and not for the account of others, and not on behalf of any other account or person or with a view to, or for offer or sale in connection with, any distribution thereof in violation of the Securities Act (and shall provide the requested information on Schedule A following the signature page hereto).

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(b) The Subscriber understands that the Shares are being offered in a transaction not involving any public offering within the meaning of the Securities Act and that the Shares have not been registered under the Securities Act. The Subscriber understands that the Shares may not be resold, transferred, pledged or otherwise disposed of by the Subscriber absent an effective registration statement under the Securities Act except (i) to the Company or a subsidiary thereof, (ii) to non-U.S. persons pursuant to offers and sales that occur outside the United States within the meaning of Regulation S under the Securities Act or (iii) pursuant to another applicable exemption from the registration requirements of the Securities Act, and in each of cases (i) and (iii), in accordance with any applicable securities laws of the states and other jurisdictions of the United States, and that any certificates or book entry account representing the Shares shall contain a legend to such effect substantially consistent with the legend set forth in Section 7(b). The Subscriber acknowledges that the Shares will not be eligible for resale pursuant to Rule 144A. The Subscriber understands and agrees that the Shares will be subject to transfer restrictions and, as a result of these transfer restrictions, the Subscriber may not be able to readily resell the Shares and may be required to bear the financial risk of an investment in the Shares for an indefinite period of time. The Subscriber understands that it has been advised to consult legal counsel prior to making any offer, resale, pledge or transfer of any of the Shares.

(c) The Subscriber understands and agrees that the Subscriber is purchasing Shares directly from the Company. The Subscriber further acknowledges that there have been no representations, warranties, covenants and agreements made to the Subscriber with respect to the Shares by the Company, or its officers or directors, expressly or by implication, other than those representations, warranties, covenants and agreements included in this Agreement.

(d) The Subscriber acknowledges and agrees that the Subscriber has received such information as the Subscriber deems necessary in order to make an investment decision with respect to the Shares. Without limiting the generality of the foregoing, the Subscriber acknowledges that it has reviewed (i) the Company’s and APX Group Holdings, Inc.’s filings with the Securities and Exchange Commission (“SEC”); and (ii) certain business and legal due diligence materials with respect to Voyager provided to the Subscriber by the Company. The Subscriber represents and agrees that the Subscriber and the Subscriber’s professional advisor(s), if any, have had the full opportunity to ask such questions, receive such answers and obtain such information as the Subscriber and the Subscriber’s professional advisor(s), if any, have deemed necessary to make an investment decision with respect to the Shares.

(e) The Subscriber became aware of this offering of the Shares solely by means of direct contact between the Subscriber and the Company or a representative of the Company, and the Shares were offered to the Subscriber solely by direct contact between the Subscriber and the Company or a representative of the Company. The Subscriber did not become aware of this offering of the Shares, nor were the Shares offered to the Subscriber, by any other means. The Subscriber acknowledges that the Company represents and warrants that the Shares (i) were not offered by any form of general solicitation or general advertising and (ii) are not being offered in a manner involving a public offering under, or in a distribution in violation of, the Securities Act, or any state securities laws.

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(f) The Subscriber acknowledges that it is aware that there are substantial risks incident to the purchase and ownership of the Shares, including those set forth in the Company’s and APX Group Holdings, Inc.’s filings with the SEC. The Subscriber has such knowledge and experience in financial and business matters as to be capable of evaluating the merits and risks of an investment in the Shares, and the Subscriber has sought such accounting, legal and tax advice as the Subscriber has considered necessary to make an informed investment decision.

(g) Alone, or together with any professional advisor(s), the Subscriber has adequately analyzed and fully considered the risks of an investment in the Shares and determined that the Shares are a suitable investment for the Subscriber and that the Subscriber is able at this time and in the foreseeable future to bear the economic risk of a total loss of the Subscriber’s investment in the Company. The Subscriber acknowledges specifically that a possibility of total loss exists.

(h) In making its decision to purchase the Shares, the Subscriber has relied solely upon independent investigation made by the Subscriber. Without limiting the generality of the foregoing, the Subscriber has not relied on any statements or other information provided by anyone other than the Company concerning the Company or the Shares or the offer and sale of the Shares.

(i) The Subscriber understands and agrees that no federal or state agency has passed upon or endorsed the merits of the offering of the Shares or made any findings or determination as to the fairness of this investment.

(j) The Subscriber has been duly formed or incorporated and is validly existing in good standing under the laws of its jurisdiction of incorporation or formation.

(k) The execution, delivery and performance by the Subscriber of this Agreement are within the powers of the Subscriber, have been duly authorized and will not constitute or result in a breach or default under or conflict with any order, ruling or regulation of any court or other tribunal or of any governmental commission or agency, or any agreement or other undertaking, to which the Subscriber is a party or by which the Subscriber is bound, and will not violate any provisions of the Subscriber’s charter documents, including, without limitation, its incorporation or formation papers, bylaws, indenture of trust or partnership or operating agreement, as may be applicable, or any other agreements to which it is party or to which its assets or business are subject. The signature of the Subscriber on this Agreement is genuine, and the signatory has been duly authorized to execute the same, and this Agreement constitutes a legal, valid and binding obligation of the Subscriber, enforceable against the Subscriber 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.

(l) Neither the due diligence investigation conducted by the Subscriber in connection with making its decision to acquire the Shares nor any representations and warranties made by the Subscriber herein shall modify, amend or affect the Subscriber’s right to rely on the truth, accuracy and completeness of the Company’s representations and warranties contained herein.

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(m) The Subscriber is not (i) a person or entity named on the List of Specially Designated Nationals and Blocked Persons administered by the U.S. Treasury Department’s Office of Foreign Assets Control (“OFAC”) or in any Executive Order issued by the President of the United States and administered by OFAC (“OFAC List”), or a person or entity prohibited by any OFAC sanctions program, (ii) a Designated National as defined in the Cuban Assets Control Regulations, 31 C.F.R. Part 515, or (iii) a non-U.S. shell bank or providing banking services indirectly to a non-U.S. shell bank. The Subscriber agrees to provide law enforcement agencies, if requested thereby, such records as required by applicable law, provided that the Subscriber is permitted to do so under applicable law. If the Subscriber is a financial institution subject to the Bank Secrecy Act (31 U.S.C. Section 5311 et seq.) (the “BSA”), as amended by the USA PATRIOT Act of 2001 (the “PATRIOT Act”), and its implementing regulations (collectively, the “BSA/PATRIOT Act”), the Subscriber maintains policies and procedures reasonably designed to comply with applicable obligations under the BSA/PATRIOT Act. To the extent required by law, it maintains policies and procedures reasonably designed for the screening of its investors against the OFAC sanctions programs, including the OFAC List. To the extent required by law, it maintains policies and procedures reasonably designed to ensure that the funds held by the Subscriber and used to purchase the Shares were legally derived.

(n) Subject to the satisfaction of the terms and conditions of this Agreement, the Subscriber will have sufficient funds to pay the Subscription Amount pursuant to Section 2 at the Closing.

(o) Assuming the Subscriber will hold no more than 10% of the Company’s issued and outstanding voting securities after giving effect to the Transaction (including the private placements contemplated thereby), the Subscriber qualifies for the “acquisition solely for the purpose of investment exemption” under 16 C.F.R. § 802.9, and the Subscriber’s acquisition of the Shares is therefore exempt from the requirements of the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended.

(p) The Subscriber acknowledges and agrees that this Agreement is being entered into in order to induce Voyager to enter into the Transaction Agreement and that Voyager is a third-party beneficiary of the Subscriber’s commitment hereunder.

7. Delivery of Securities.

(a) The Company shall register the Subscriber as the owner of the Shares purchased by the Subscriber hereunder (individually or collectively, the “Securities”) in the appropriate books and records of the Company and with the Company’s transfer agent in certificated form or by book entry on or promptly after (but in no event more than two (2) Business Days after) the date of the Closing.

(b) Each register and book entry for the Securities shall contain a notation, and each certificate (if any) evidencing the Securities shall be stamped or otherwise imprinted with a legend, in substantially the following form:

“THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES LAWS OF ANY STATE OR OTHER JURISDICTION, AND MAY NOT BE TRANSFERRED IN VIOLATION OF SUCH ACT AND LAWS.

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THE SALE, PLEDGE, HYPOTHECATION, OR TRANSFER OF THE SECURITIES REPRESENTED HEREBY ARE SUBJECT TO THE TERMS AND CONDITIONS OF A CERTAIN SUBSCRIPTION AGREEMENT BY AND AMONG THE HOLDER AND THE OTHER PARTIES THERETO. COPIES OF SUCH AGREEMENT MAY BE OBTAINED UPON WRITTEN REQUEST TO THE SECRETARY OF THE COMPANY.

(c) If the Securities are eligible to be sold without restriction under, and without the Company being in compliance with the current public information requirements of, Rule 144 under the Securities Act, then at the Subscriber’s request, the Company will cause the Company’s transfer agent to remove the legend set forth in Section 7(b). In connection therewith, if required by the Company’s transfer agent, the Company will promptly cause an opinion of counsel to be delivered to and maintained with its transfer agent, together with any other authorizations, certificates and directions required by the transfer agent that authorize and direct the transfer agent to issue such Securities without any such legend.

8. Lockup Agreement. Concurrently with the execution of this Agreement and as a condition to the effectiveness of this Agreement, the Subscriber has entered into a lockup agreement with Mosaic (the “Lockup Agreement”).

9. Termination. This Agreement shall terminate and be void and of no further force and effect, and all rights and obligations of the parties hereunder shall terminate without any further liability on the part of any party in respect thereof, upon the earlier to occur of (a) such date and time as the Transaction Agreement is terminated in accordance with its terms, (b) the mutual written agreement of each of the parties hereto and Voyager to terminate this Agreement or (c) if any of the conditions to Closing set forth in Section 3 of this Agreement are not satisfied or waived on or prior to the Closing and, as a result thereof, the transactions contemplated by this Agreement are not consummated at the Closing. The Company shall promptly notify the Subscriber of (i) the termination of the Transaction Agreement promptly after the termination of such agreement, (ii) any amendment to the Transaction Agreement and (iii) any waiver of any of the conditions specified in Article IX of the Transaction Agreement.

10. Trust Account Waiver. The Subscriber acknowledges that the Company is a blank check company with the powers and privileges necessary or convenient to the conduct, promotion or attainment of the business or purposes of the Company, including, but not limited to, effecting a merger, capital stock exchange, asset acquisition, stock purchase, reorganization or similar business combination involving the Company and one or more businesses. The Subscriber hereby acknowledges that the Company established the trust account at J.P. Morgan Chase Bank, N.A. (the “Trust Account”), maintained by Continental Stock Transfer & Trust Company, a New York corporation, acting as trustee, pursuant to the Investment Management Trust Agreement, dated October 18, 2017, by and between the Company and the trustee, for the benefit of its public shareholders upon the closing of its initial public offering. For and in consideration of the Company entering into this Agreement, the receipt and sufficiency of which are hereby acknowledged, the Subscriber hereby irrevocably waives any and all right, title and interest, or any claim of any kind it has or may have in the future, in or to any monies held in the Trust Account, and agrees not to seek recourse against the Trust Account as a result of, or arising out of, this Agreement.

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11. Miscellaneous.

(a) The Company may not assign either this Agreement or any of its rights, interests or obligations hereunder without the prior written consent of the Subscriber and Voyager.

(b) The Company may request from the Subscriber such additional information as the Company may deem necessary to evaluate the eligibility of the Subscriber to acquire the Shares, and the Subscriber shall provide such information as may reasonably be requested, to the extent readily available and to the extent consistent with its internal policies and procedures.

(c) The Subscriber acknowledges that the Company will rely on the acknowledgments, understandings, agreements, representations and warranties contained in this Agreement. Prior to the Closing, the Subscriber agrees to promptly notify the Company if any of the acknowledgments, understandings, agreements, representations and warranties set forth herein are no longer accurate. The Subscriber further acknowledges and agrees that Voyager is a third-party beneficiary of the representations and warranties of the Subscriber contained in Section 6 of this Agreement.

(d) Each of the Company and Voyager is entitled to rely upon this Agreement and is irrevocably authorized to produce this Agreement or a copy hereof to any interested party in any administrative or legal proceeding or official inquiry with respect to the matters covered hereby.

(e) All the agreements, representations and warranties made by each party hereto in this Agreement shall survive the Closing.

(f) This Agreement may not be modified or waived (i) except by an instrument in writing, signed by the party against whom enforcement of such modification or waiver is sought and (ii) without the prior written consent of Voyager.

(g) This Agreement constitutes the entire agreement, and supersedes all other prior agreements, understandings, representations and warranties, both written and oral, among the parties, with respect to the subject matter hereof. This Agreement shall not confer any rights or remedies upon any person other than the parties hereto, and their respective successors and assigns; provided, that, subject to the terms and conditions of this Agreement and the Transaction Agreement, Voyager shall have the right, as a third party beneficiary of this Agreement, to obtain specific performance of the Subscriber’s obligation to cause the Subscription Amount to be funded when due hereunder (including, to the extent necessary to cause such funding, to cause the Subscriber to use reasonable best efforts to enforce contractual commitments available to the Subscriber), but solely to the extent the Company has the right hereunder to enforce such obligation pursuant to the terms, and subject to the conditions, hereof and solely to the extent required to give effect to a grant of specific performance to Voyager under and in accordance with the terms and conditions of the Transaction Agreement (as in effect on the date hereof), and for no other purpose, which right of Voyager as third party beneficiary shall be the sole and exclusive direct or indirect right and remedy (whether at law or in equity) available to Voyager and its security holders and affiliates (or available to any Person claiming by, through, or on behalf or for the benefit of any of them) against the Subscriber or any of its direct or indirect equityholders, management companies, affiliates, agents, attorneys, or representatives, and any

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financial advisor or lender or any affiliate of any of the foregoing, with respect to any claim (whether sounding in contract or tort, under statute or otherwise) arising under or related to the Transaction Agreement or this Agreement or the transactions contemplated hereby or thereby or related negotiations, including without limitation in connection with any beach or alleged breach by the Company of any obligation under or related to the Transaction Agreement (whether or not any such breach or alleged breach is caused by the Subscriber’s breach of its obligations under this Agreement) and any breach or alleged breach by the Subscriber of any obligation under or related to this Agreement.

(h) Except as otherwise provided herein, this Agreement shall be binding upon, and inure to the benefit of, the parties hereto and their heirs, executors, administrators, successors, legal representatives, and permitted assigns, and the agreements, representations, warranties, covenants and acknowledgments contained herein shall be deemed to be made by, and be binding upon, such heirs, executors, administrators, successors, legal representatives and permitted assigns.

(i) If any provision of this Agreement shall be invalid, illegal or unenforceable, the validity, legality or enforceability of the remaining provisions of this Agreement shall not in any way be affected or impaired thereby and shall continue in full force and effect.

(j) This Agreement may be executed in one or more counterparts (including by facsimile or electronic mail or in .pdf) and by different parties in separate counterparts, with the same effect as if all parties hereto had signed the same document. All counterparts so executed and delivered shall be construed together and shall constitute one and the same agreement.

(k) The parties hereto agree that irreparable damage would occur in the event that any of the provisions of this Agreement were not performed in accordance with their specific terms or were otherwise breached. It is accordingly agreed that the parties shall be entitled to an injunction or injunctions to prevent breaches of this Agreement and to enforce specifically the terms and provisions of this Agreement, this being in addition to any other remedy to which such party is entitled at law, in equity, in contract, in tort or otherwise.

(l) THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF DELAWARE, WITHOUT REGARD TO THE PRINCIPLES OF CONFLICTS OF LAWS THAT WOULD OTHERWISE REQUIRE THE APPLICATION OF THE LAW OF ANY OTHER STATE. EACH PARTY HERETO HEREBY WAIVES ANY RIGHT TO A JURY TRIAL IN CONNECTION WITH ANY LITIGATION PURSUANT TO THIS AGREEMENT AND THE TRANSACTIONS CONTEMPLATED HEREBY.

(m) Each party hereto hereby, and any person asserting rights as a third party beneficiary hereunder may do so only if he, she or it, irrevocably agrees that any claims shall be brought only to the exclusive jurisdiction of the courts of the State of Delaware located in New Castle County or, if such courts decline to exercise jurisdiction, any federal or state court located in New York County, New York, and each party hereby consents to the jurisdiction of such courts (and of the appropriate appellate courts therefrom) in any such suit, action or proceeding and irrevocably waives, to the fullest extent permitted by law, any objection that it may now or

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hereafter have to the laying of the venue of any such suit, action or proceeding in any such court or that any such suit, action or proceeding that is brought in any such court has been brought in an inconvenient forum. During the period a claim that is filed in accordance with this Section 11(m) is pending before a court, all actions, suits or proceedings with respect to such claim or any other claim, including any counterclaim, cross-claim or interpleader, shall be subject to the exclusive jurisdiction of such court. Each party and any person asserting rights as a third party beneficiary may do so only if he, she or it hereby waives, and shall not assert as a defense in any claim, that (a) such party is not personally subject to the jurisdiction of the above named courts for any reason, (b) such action, suit or proceeding may not be brought or is not maintainable in such court, (c) such party’s property is exempt or immune from execution, (d) such action, suit or proceeding is brought in an inconvenient forum, or (e) the venue of such action, suit or proceeding is improper. A final judgment in any action, suit or proceeding described in this Section 11(m) following the expiration of any period permitted for appeal and subject to any stay during appeal shall be conclusive and may be enforced in other jurisdictions by suit on the judgment or in any other manner provided by law.

12. Non-Reliance and Exculpation. The Subscriber acknowledges that it is not relying upon, and has not relied upon, any statement, representation or warranty made by any person, firm or corporation (including, without limitation, Voyager, any of its affiliates or any of its or their control persons, officers, directors and employees), other than the statements, representations and warranties contained in this Agreement, in making its investment or decision to invest in the Company. The Subscriber agrees that neither (i) any other purchaser pursuant to this Agreement or any other agreement related to the private placement of the Shares (including the respective controlling persons, officers, directors, partners, agents, or employees of any such purchaser) nor (ii) Voyager, its affiliates or any of its or their affiliates’ control persons, officers, directors or employees, shall be liable to any other purchaser pursuant to this Agreement or any other Agreement related to the private placement of the Shares for any action heretofore or hereafter taken or omitted to be taken by any of them in connection with the purchase of the Shares.

13. Additional Consideration. Reference is made to that certain Sponsor Agreement, dated as of September 15, 2019 (the “Sponsor Agreement”), by and among the Company, Voyager, the Sponsor, Eugene I. Davis and Fortress Mosaic Sponsor LLC, a Delaware limited liability company. The Sponsor hereby agrees to forfeit to the Company 25% of the Founder Shares and Private Placement Warrants (each as defined in the Sponsor Agreement) held by the Sponsor as of the closing of the Transaction and the Company shall issue, as additional consideration for the Subscription, an equal number of shares and warrants (together, the “Additional Securities”) to the Subscriber. The Company, the Subscriber and Voyager hereby agree that the Subscriber shall be subject to paragraph 4(c) of the Sponsor Agreement as if it were a “Sponsor” thereunder with respect to such Additional Securities (which, for the avoidance of doubt, shall be subject to the same vesting and forfeiture provisions set forth in paragraph 4(c) of the Sponsor Agreement that are applicable to the Founder Shares and the Private Placement Warrants). The Sponsor and the Subscriber further agree that in the event any forward purchasers (including the Subscriber, the “Forward Purchasers”) party to those certain Forward Purchase Agreements, each dated as of September 26, 2017, entered into by the Company, the Sponsor, Fortress Mosaic Sponsor LLC and each Forward Purchaser (as amended, the “Forward Purchase Agreements”) exercise their Contingent Call Option (as defined in the Forward Purchase Agreements), the Subscriber’s right to exercise its Contingent Call Option shall be reduced by 25% of the total shares otherwise transferrable by the Sponsor to all Forward Purchasers exercising such Contingent Call Options against the Sponsor.

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14. Registration Rights. On or prior to the expiration of the Lock-Up Period (as defined in the Lockup Agreement) (the “Filing Deadline”), the Company will file a resale “shelf” registration statement on Form S-3 (the “Registration Statement”) covering the Shares; provided, that if Form S-3 is unavailable for such a registration, the Company shall register the resale of the Shares on another appropriate form and undertake to register the Shares on Form S-3 as soon as such form is available. The Company will use commercially reasonable efforts to have the Registration Statement declared effective by the SEC within sixty (60) days after the Filing Deadline (the “Effectiveness Deadline”); provided, that the Effectiveness Deadline will be extended to one-hundred and twenty (120) days after the Filing Deadline if the Registration Statement is reviewed by, and the Company receives comments from, the SEC. The Company will use its commercially reasonable efforts to maintain the continuous effectiveness of the Registration Statement until all such securities are freely transferable by the holder without registration and without volume or manner of sale restrictions under the Securities Act pursuant to Rule 144 thereunder or such shorter period ending when such registrable securities have actually been sold. The limitations on registration rights set forth in paragraphs 3, 9 and 10 of Exhibit A to the Subscriber’s Forward Purchase Agreement shall apply to the Shares and the registration rights in this paragraph 14 mutatis mutandis.

[SIGNATURE PAGES FOLLOW]

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IN WITNESS WHEREOF, the Subscriber has executed or caused this Agreement to be executed by its duly authorized representative as of the date set forth above.

IN WITNESS WHEREOF, the Company has executed or caused this Agreement to be executed by its duly authorized representative as of the date set forth above.

IN WITNESS WHEREOF, Voyager has executed or caused this Agreement to be executed by its duly authorized representative as of the date set forth above.

SCHEDULE A

ELIGIBILITY REPRESENTATIONS OF THE SUBSCRIBER

(Please check the applicable box)

THE SUBSCRIBER:

an “affiliate” (as defined in Rule 144 under the Securities Act) of the Company or acting on behalf of an affiliate of the Company.

This page should be completed by the Subscriber and constitutes a part of the Agreement

Exhibit 10.2

LOCKUP AGREEMENT

This Lockup Agreement is dated as of December 18, 2019 and is between Mosaic Acquisition Corp., a Delaware corporation (“Mosaic”), and each of the stockholder parties 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 Party” for purposes of this Agreement (collectively, the “Stockholder Parties”). Capitalized terms used but not defined herein shall have the meanings assigned to them in the Stockholders Agreement (as defined below).

BACKGROUND:

WHEREAS, the Stockholder Party has agreed to purchase 5,000,000 shares of Class A Common Stock of Mosaic (the “Purchased Shares”) pursuant to a Subscription Agreement, dated as of December 18, 2019, by and among Vivint Smart Home, Inc., and the Stockholder Party;

WHEREAS, Legacy Vivint and Mosaic are executing Amendment No. 1 to the Merger Agreement on the date hereof pursuant to which a subsidiary of Mosaic will merge with and into Legacy Vivint and Mosaic will be renamed Vivint Smart Home, Inc.; and

WHEREAS, in connection with the Merger and effective upon the consummation thereof, the parties hereto wish to set forth herein certain understandings between such parties with respect to restrictions on transfer of equity interests in Mosaic.

NOW, THEREFORE, the parties agree as follows:

ARTICLE I

INTRODUCTORY MATTERS

1.1. Defined Terms. In addition to the terms defined elsewhere herein, the following terms have the following meanings when used herein with initial capital letters:

“Agreement” means this Lockup Agreement, as the same may be amended, supplemented, restated or otherwise modified from time to time in accordance with the terms hereof.

“Company” means Mosaic following the consummation of the Merger, which shall be renamed “Vivint Smart Home, Inc.”

“covered shares” has the meaning set forth in Section 2.1.

“Exchange Act” means the Securities Exchange Act of 1934, as amended, and the rules and regulations promulgated thereunder, as the same may be amended from time to time.

“immediate family” has the meaning set forth in Section 2.1(b).

“Lock-Up Period” has the meaning set forth in Section 2.1(a).

“Non-Recourse Party” has the meaning set forth in Section 3.16.

“Permitted Transferees” means with respect to a Stockholder Party, a Transferee of shares that agrees to become party to, and to be bound to the same extent as its Transferor by the terms of, this Agreement.

“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.

“Stockholder Parties” has the meaning set forth in the Preamble.

“Stockholders Agreement” means the Stockholders Agreement, dated as of September 15, 2019, by and among Legacy Vivint, Mosaic and the other parties thereto.

“Stockholders Agreement Parties” means the “Stockholder Parties” as defined in the Stockholders Agreement.

1.2. Construction. The language used in this Agreement will be deemed to be the language chosen by the parties to express their mutual intent, and no rule of strict construction will be applied against any party. Unless the context otherwise requires: (a) “or” is disjunctive but not exclusive, (b) words in the singular include the plural, and in the plural include the singular, and (c) the words “hereof”, “herein”, and “hereunder” and words of similar import when used in this Agreement refer to this Agreement as a whole and not to any particular provision of this Agreement, and Section references are to sections of this Agreement unless otherwise specified.

ARTICLE II

LOCKUP

2.1. Lockup. (a) During the period beginning on the effective time of the Merger and continuing to and including the date that is six (6) months after the Closing Date (the “Lock-Up Period”), each Stockholder Party agrees not to, directly or indirectly, offer, sell, contract to sell, pledge, grant any option to purchase, make any short sale or otherwise dispose of the Purchased Shares, or any options or warrants to purchase any Purchased Shares, or any securities convertible into, exchangeable for or that represent the right to receive the Purchased Shares, or any interest in any of the foregoing, whether now owned or hereinafter acquired, owned directly by the undersigned (including holding as a custodian) or with respect to which the undersigned has beneficial ownership within the rules and regulations of the U.S. Securities and Exchange Commission (collectively, the “covered shares”). The foregoing restriction is expressly agreed to preclude such Stockholder Parties from engaging in any hedging or other transaction which is designed to or which reasonably could be expected to lead to or result in a sale or disposition of the covered shares even if such covered shares would be disposed of by someone other than such Stockholder Parties. Such prohibited hedging or other transactions would include, without limitation, any short sale or any purchase, sale or grant of any right (including, without limitation, any put or call option) with respect to any of the covered shares or with respect to any security that includes, relates to, or derives any significant part of its value from such covered shares.

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(b) Notwithstanding the foregoing, a Stockholder Party may transfer or dispose of its shares (i) by will or intestacy, (ii) as a bona fide gift or gifts, including to charitable organizations, (iii) to any trust, partnership, limited liability company or other entity for the direct or indirect benefit of the undersigned or the immediate family of the undersigned (for purposes of this Section 2.1, “immediate family” shall mean any relationship by blood, current or former marriage or adoption, not more remote than first cousin), (iv) to any immediate family member or other dependent, (v) as a distribution to limited partners, members or stockholders of such Stockholder Party, (vi) to its Affiliated investment fund or other Affiliated entity controlled or managed by such Stockholder Party or its Affiliates, (vii) to a nominee or custodian of a Person to whom a disposition or transfer would be permissible under clauses (i) through (vi) above, (viii) pursuant to an order or decree of a Governmental Authority, (ix) from an executive officer to the Company or its Subsidiary or parent entities upon death, disability or termination of employment, in each case, of such executive officer, (x) pursuant to a bona fide third-party tender offer, merger, consolidation or other similar transaction in each case made to all holders of the shares involving a Change of Control (as defined below) (including negotiating and entering into an agreement providing for any such transaction), provided that in the event that such tender offer, merger, consolidation or other such transaction is not completed, such Stockholder Party’s shares shall remain subject to the provisions of this Section 2.1, (xi) to the Company (1) pursuant to the exercise, in each case on a “cashless” or “net exercise” basis, of any option to purchase shares granted by the Company pursuant to any employee benefit plans or arrangements which are set to expire during the Lock-Up Period, where any shares received by the undersigned upon any such exercise will be subject to the terms of this Section 2.1, or (2) for the purpose of satisfying any withholding taxes (including estimated taxes) due as a result of the exercise of any option to purchase shares or the vesting of any restricted stock awards granted by the Company pursuant to employee benefit plans or arrangements which are set to expire or automatically vest during the Lock-Up Period, in each case on a “cashless” or “net exercise” basis, where any shares received by such Stockholder Party upon any such exercise or vesting will be subject to the terms of this Section 2.1, or (xii) with the prior written consent of the Company; provided that:

(i) in the case of each transfer or distribution pursuant to clauses (ii) through (vii) above, (a) each donee, trustee, distributee or transferee, as the case may be, agrees to be bound in writing by the restrictions set forth in this Section 2.1; and (b) any such transfer or distribution shall not involve a disposition for value, other than with respect to any such transfer or distribution for which the transferor or distributor receives (x) equity interests of such transferee or (y) such transferee’s interests in the transferor;

(ii) in the case of each transfer or distribution pursuant to clauses (ii) through (vii) above, if any public reports or filings (including filings under Section 16(a) of the Exchange Act) reporting a reduction in beneficial ownership of shares shall be required or shall be voluntarily made during the Lock-Up Period (a) such Stockholder Party shall provide the Company prior written notice informing them of such report or filing and (b) such report or filing shall disclose that such donee, trustee, distributee or transferee, as the case may be, agrees to be bound in writing by the restrictions set forth herein;

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(iii) for purposes of clause (x) above, “Change of Control” shall mean the transfer to or acquisition by (whether by tender offer, merger, consolidation, division or other similar transaction), in one transaction or a series of related transactions, a Person or group of Affiliated Persons (other than the 313 Acquisition Entities or an underwriter pursuant to an offering), of the Company’s voting securities if, after such transfer or acquisition, such Person or group of Affiliated Persons would Beneficially Own more than 50% of the outstanding voting securities of the Company (or the surviving entity);

(iv) any consent granted to a 313 Acquisition Entity pursuant to Section 3.1(b)(xii) of the Confidentiality and Lockup Agreement to which a 313 Acquisition Entity is party with the Company shall be automatically granted to all Stockholder Parties; and

(v) any consent granted to a PIPE Holder pursuant to Section 2.1(b)(xii) of the Confidentiality and Lockup Agreement to which a PIPE Holder is party with the Company shall be automatically granted to all PIPE Holders.

(c) Each Stockholder Party shall be permitted to enter into a trading plan established in accordance with Rule 10b5-1 under the Exchange Act during the applicable Lock-Up Period so long as no transfers or other dispositions of such Stockholder Party’s shares in contravention of Section 2.1 are effected prior to the expiration of the applicable Lock-Up Period.

(d) Each Stockholder Party also agrees and consents to the entry of stop transfer instructions with the Company’s transfer agent and registrar against the transfer of the covered shares except in compliance with the foregoing restrictions and to the addition of a legend to such Stockholder Party’s shares describing the foregoing restrictions.

ARTICLE III

GENERAL PROVISIONS

3.1. Termination. Subject to Section 3.14 or the early termination of any provision as a result of an amendment to this Agreement agreed to by the Board and the Stockholder Parties, as provided under Section 3.3, this Agreement (other than Article III hereof), shall terminate with respect to each Stockholder Party and its Permitted Transferees at such time as such Stockholder Party or Permitted Transferee is no longer subject to the restrictions contained in Section 2.1.

3.2. Notices. Any notice, designation, request, request for consent or consent provided for in this Agreement shall be in writing and shall be either personally delivered, or mailed first class mail (postage prepaid) or sent by reputable overnight courier service (charges prepaid) to the Company at the address set forth below and to any other recipient at the address indicated on the Company’s records, or at such address or to the attention of such other Person as the recipient party has specified by prior written notice to the sending party. Notices will be deemed to have been given hereunder when sent by facsimile (receipt confirmed) or delivered personally, five (5) days after deposit in the U.S. mail and one (1) day after deposit with a reputable overnight courier service.

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The Company’s address is:

Vivint Smart Home, Inc.

4931 North 300 West

Provo, Utah 84604

Attention: Chief Legal Officer

with a copy (not constituting notice) to:

Simpson Thacher & Bartlett LLP

425 Lexington Avenue

New York, NY 10017

Attention: Igor Fert, Esq.

Fax: (212) 455-2502

If to any Stockholder Party, to such address as such Stockholder Party shall furnish to the Company in writing.

3.3. Amendment; Waiver. (a) The terms and provisions of this Agreement may be modified or amended only with the written approval of the Company and Stockholder Parties holding a majority of the shares then held by the Stockholder Parties in the aggregate as to which this Agreement has not been terminated pursuant to Section 3.1. Prior to the consummation of the Merger, this Agreement may not be amended without the prior written consent of Legacy Vivint.

(b) Except as expressly set forth in this Agreement, neither the failure nor delay on the part of any party hereto to exercise any right, remedy, power or privilege under this Agreement shall operate as a waiver thereof, nor shall any single or partial exercise of any right, remedy power or privilege preclude any other or further exercise of the same or of any other right, remedy, power or privilege, nor shall any waiver of any right, remedy, power or privilege with respect to any occurrence be construed as a waiver of such right, remedy, power or privilege with respect to any other occurrence.

(c) No party shall be deemed to have waived any claim arising out of this Agreement, or any right, remedy, power or privilege under this Agreement, unless the waiver of such claim, right, remedy, power or privilege is expressly set forth in a written instrument duly executed and delivered on behalf of such party; and any such waiver shall not be applicable or have any effect except in the specific instance in which it is given.

(d) Any party hereto may unilaterally waive any of its rights hereunder in a signed writing delivered to the Company.

3.4. Further Assurances. The parties hereto will sign such further documents, cause such meetings to be held, resolutions passed, exercise their votes and do and perform and cause to be done such further acts and things necessary, proper or advisable in order to give full effect to this Agreement and every provision hereof.

3.5. Assignment. This Agreement may not be assigned without the express prior written consent of the other parties hereto, and any attempted assignment, without such consents, will be null and void. This Agreement will inure to the benefit of and be binding on the parties hereto and their respective successors and permitted assigns.

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3.6. Third Parties. Except as provided for in Article II and Article III with respect to any Non-Recourse Party, this Agreement does not create any rights, claims or benefits inuring to any person that is not a party hereto nor create or establish any third party beneficiary hereto.

3.7. Governing Law. THIS AGREEMENT AND ITS ENFORCEMENT AND ANY CONTROVERSY ARISING OUT OF OR RELATING TO THE MAKING OR PERFORMANCE OF THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

3.8. Jurisdiction; Waiver of Jury Trial. Each party hereto hereby (i) agrees that any action, directly or indirectly, arising out of, under or relating to this Agreement shall exclusively be brought in and shall exclusively be heard and determined by either the Supreme Court of the State of New York sitting in Manhattan or the United States District Court for the Southern District of New York, and (ii) solely in connection with the action(s) contemplated by subsection (i) hereof, (A) irrevocably and unconditionally consents and submits to the exclusive jurisdiction of the courts identified in subsection (i) hereof, (B) irrevocably and unconditionally waives any objection to the laying of venue in any of the courts identified in clause (i) of this Section 3.8, (C) irrevocably and unconditionally waives and agrees not to plead or claim that any of the courts identified in such clause (i) is an inconvenient forum or does not have personal jurisdiction over any party hereto, and (D) agrees that mailing of process or other papers in connection with any such action in the manner provided herein or in such other manner as may be permitted by applicable law shall be valid and sufficient service thereof. EACH PARTY HERETO HEREBY IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY CLAIM OR ACTION DIRECTLY OR INDIRECTLY ARISING OUT OF, UNDER OR IN CONNECTION WITH THIS AGREEMENT.

3.9. Specific Performance. Each party hereto acknowledges and agrees that in the event of any breach of this Agreement by any of them, the other parties hereto would be irreparably harmed and could not be made whole by monetary damages. Each party accordingly agrees to waive the defense in any action for specific performance that a remedy at law would be adequate and that the parties, in addition to any other remedy to which they may be entitled at law or in equity, shall be entitled to specific performance of this Agreement without the posting of a bond.

3.10. Entire Agreement. This Agreement sets forth the entire understanding of the parties hereto with respect to the subject matter hereof. There are no agreements, representations, warranties, covenants or understandings with respect to the subject matter hereof other than those expressly set forth herein. This Agreement supersedes all other prior agreements and understandings between the parties with respect to such subject matter.

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3.11. Severability. If any provision of this Agreement, or the application of such provision to any Person or circumstance or in any jurisdiction, shall be held to be invalid or unenforceable to any extent, (i) the remainder of this Agreement shall not be affected thereby, and each other provision hereof shall be valid and enforceable to the fullest extent permitted by Law, (ii) as to such Person or circumstance or in such jurisdiction such provision shall be reformed to be valid and enforceable to the fullest extent permitted by Law and (iii) the application of such provision to other Persons or circumstances or in other jurisdictions shall not be affected thereby.

3.12. Table of Contents, Headings and Captions. The table of contents, headings, subheadings and captions contained in this Agreement are included for convenience of reference only, and in no way define, limit or describe the scope of this Agreement or the intent of any provision hereof.

3.13. Counterparts. This Agreement and any amendment hereto may be signed in any number of separate counterparts, each of which shall be deemed an original, but all of which taken together shall constitute one agreement (or amendment, as applicable).

3.14. Effectiveness. 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 III) 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.

3.15. No Recourse. This Agreement may only be enforced against, and any claim or cause of action that may be based upon, arise out of or relate to this Agreement, or the negotiation, execution or performance of this Agreement, the transactions contemplated hereby or the subject matter hereof may only be made against the parties hereto and no past, present or future Affiliate, director, officer, employee, incorporator, member, manager, partner, shareholder, agent, attorney or representative of any party hereto or any past, present or future Affiliate, director, officer, employee, incorporator, member, manager, partner, stockholder, agent, attorney or representative of any of the foregoing (each, a “Non-Recourse Party”) shall have any liability for any obligations or liabilities of the parties to this Agreement or for any claim based on, in respect of, or by reason of, the transactions contemplated hereby. Without limiting the rights of any party against the other parties hereto, in no event shall any party or any of its Affiliates seek to enforce this Agreement against, make any claims for breach of this Agreement against, or seek to recover monetary damages from, any Non-Recourse Party.

[Remainder of Page Intentionally Left Blank]

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IN WITNESS WHEREOF, the parties hereto have executed this Lockup Agreement on the day and year first above written.

[Signature Page to Lockup Agreement]

[Signature Page to Lockup Agreement]

Exhibit A

Fayerweather Fund Eiger, L.P.

Exhibit B

FORM OF JOINDER TO LOCKUP AGREEMENT

[            ], 20        

Reference is made to the Lockup Agreement, dated as of December 18, 2019, by and between Mosaic Acquisition Corp., Fayerweather Fund Eiger, L.P. and the other Stockholder Parties (as defined therein) from time to time party thereto (as amended from time to time, the “Lockup Agreement”). Capitalized terms used but not otherwise defined herein shall have the meanings ascribed to such terms in the Lockup Agreement.

Each of the Company and each undersigned holder of shares of the Company (each, a “New Stockholder Party”) agrees that this Joinder to the Lockup Agreement (this “Joinder”) is being executed and delivered for good and valuable consideration.

Each undersigned New Stockholder Party hereby agrees to and does become party to the Lockup Agreement as a Stockholder Party. This Joinder shall serve as a counterpart signature page to the Lockup Agreement and by executing below each undersigned New Stockholder Party is deemed to have executed the Lockup 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.

Exhibit 10.3

Execution Version

SUBSCRIPTION

AND

BACKSTOP AGREEMENT

This Subscription and Backstop Agreement (this “Agreement”), made as of December 18, 2019 by and among Mosaic Acquisition Corp., a Delaware corporation (the “Company”), Vivint Smart Home, Inc., a Delaware corporation (“Vivint”), and the Subscriber identified on the signature pages hereto (the “Subscriber”), is intended to set forth certain representations, covenants and agreements among the Company, Vivint and the Subscriber:

(i) with respect to the acquisition by the Subscriber of shares of Class A common stock of the Company, par value $0.0001 per share (the “Common Stock”), through the open market and private transactions described in Section 2 hereof; and

(ii) with respect to the private offering of shares of Common Stock (the “Common Offering”) for sale by the Company and the purchase of such shares by the Subscriber, pursuant to Section 3 hereof.

The respective representations, covenants and agreements set forth herein are made in connection with the Company’s proposed business combination with Vivint, pursuant to that certain Agreement and Plan of Merger dated as of September 15, 2019, by and among the Company, Vivint and Maiden Merger Sub, Inc., a Delaware corporation (as amended, the “Merger Agreement”; such business combination, the “Merger”, and the consummation of the Merger in accordance with the terms of the Merger Agreement, the “Merger Closing”).

In consideration of the respective representations, covenants and agreements contained herein, subject to the terms and conditions hereof, and without amending or limiting the Lockup Agreement (as defined below), the Subscriber, the Company and Vivint hereby agree as follows:

1. Transfer and Voting of Common Stock.

(a) The Subscriber covenants and agrees that until the earlier of (i) the Merger Closing and (ii) the date on which the Merger Agreement is terminated in accordance with its terms (the “Termination Date”), it shall not, and shall ensure that its Affiliates do not, Transfer any Common Stock except to Fortress Mosaic Investor LLC. For purposes hereof, “Affiliate” shall mean affiliate as such term is defined in Rule 12b-2 under the Exchange Act (as defined below) and “Transfer” shall mean any direct or indirect transfer, redemption, disposition or monetization in any manner whatsoever, including, without limitation, through redemption election or any derivative transactions. The Subscriber hereby agrees to be bound by that certain Confidentiality and Lockup Agreement, dated September 15, 2019 (the “Lockup Agreement”), among the Company, Fortress Mosaic Sponsor LLC, Fortress Mosaic Investor LLC, Fortress Mosaic Anchor LLC and the other parties from time to time party thereto as a “Stockholder Party” (as defined therein).

(b) The Subscriber covenants and agrees that it shall, and shall cause each of its Affiliates to, (A) vote all the Common Stock, if any, that it or they owned on the record date for the special meeting of stockholders to be held by the Company to approve, among other things, the Merger (the “Special Meeting”) in favor of (x) the Merger, pursuant to a proxy statement/consent solicitation/prospectus filed by the Company with the Securities and Exchange Commission (the “SEC”) in connection with the Special Meeting (the “Proxy Statement”) and (y) each of the other proposals of the Company set forth in the Proxy Statement, and (B) not exercise its or their redemption rights in any Common Stock in connection with the Special Meeting or the Merger.

2. Backstop

Commencing on the date hereof and ending at the close of business on the third Trading Day prior to the Special Meeting (“Backstop Deadline”), the Subscriber intends (and will take actions in furtherance thereof, subject to applicable securities laws (including any applicable safe harbors), including Rule 10b-5, Rule 10b-18 and Regulation M) to purchase up to $50,000,000 in aggregate purchase price of shares of Common Stock of the Company (the “Backstop Purchase”) in the open market (the “Open Market Shares”) or in privately negotiated transactions with third parties, including forward contracts (the “Private Purchase Shares”, and collectively with the Open Market Shares, the “Backstop Shares”), provided that such transactions settle no later than, or are conditioned upon, the Merger Closing. On the date immediately following the Backstop Deadline and promptly at other times requested by the Company from time to time, the Subscriber shall (x) notify the Company in writing of the number of Open Market Shares and Private Purchase Shares so purchased and (y) provide the Company, for all Backstop Shares acquired, all documentary evidence reasonably requested by the Company and its advisors (including without limitation, its legal counsel) and its transfer agent and proxy solicitor to confirm that the Subscriber has purchased, or has contracted to purchase, such shares. For purposes hereof, “Trading Day” shall mean a day during which trading in the Common Stock generally occurs on the New York Stock Exchange (the “NYSE”) or, if the Common Stock is not listed on the NYSE, on the principal other national or regional securities exchange on which the Common Stock is then listed or, if the Common Stock is not listed on a national or regional securities exchange, on the principal other market on which the Common Stock is then listed or admitted for trading.

3. Subscription

(a) Subject to the terms and conditions set forth in this Agreement, in the event that any holder of Common Stock, contemporaneously with or prior to the vote of the Company’s stockholders in the Special Meeting, elects to have such holder’s shares of Common Stock redeemed by the Company, the Subscriber hereby irrevocably subscribes for and agrees to purchase from the Company, at a purchase price per share equal to the redemption price per share based on the amount of funds in the Trust Account as of the date of the redemption deadline (the “Trust Price”), up to the lesser of (x) $50,000,000 in aggregate purchase price of shares of Common Stock of the Company, less the aggregate purchase price of the Backstop Shares purchased by it pursuant to Section 2 hereof, and (y) the aggregate value (based on the Trust Price) of the number of shares so elected to be redeemed by holders of Common Stock, and the Company agrees to sell such shares to the Subscriber at such per share price (the shares of

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Common Stock to be so sold, the “Redemption Shares”), provided that, if the Merger Closing does not occur on or before January 23, 2020 (unless otherwise extended by mutual consent of the parties hereto), then the Subscriber’s obligations to purchase, and the Company’s obligation to issue, shares pursuant to the foregoing sentence are extinguished as of such date. Any such purchase shall be consummated immediately prior to the Merger Closing.

(b) Subject to the terms and conditions set forth in this Agreement, at the election of Vivint (exercisable upon written notice delivered to the Subscriber and the Company not less than two (2) Business Days prior to the Merger Closing), the Subscriber hereby irrevocably subscribes for and agrees to purchase from the Company, at a purchase price of $10.00 per share, up to $50,000,000 in aggregate purchase price of shares of Common Stock of the Company, less the aggregate purchase price of (i) the Backstop Shares purchased by it pursuant to Section 2 hereof and (ii) the Redemption Shares purchased by it pursuant to Section 3(a) hereof, and the Company agrees to sell such shares to the Subscriber at such per share price (the shares of Common Stock to be so sold, collectively with the Redemption Shares, the “Subject Shares”), provided that, if the Merger Closing does not occur on or before January 23, 2020 (unless otherwise extended by mutual consent of the parties hereto), then the Subscriber’s obligations to purchase, and the Company’s obligation to issue, shares pursuant to the foregoing sentence are extinguished as of such date. Any such purchase shall be consummated immediately prior to the Merger Closing.

4. Delivery of Subscription Amount; Acceptance of Subscriptions; Delivery. The Subscriber understands and agrees that this subscription is made subject to the following terms and conditions:

(a) Contemporaneously with the execution and delivery of this Agreement, the Subscriber shall execute and deliver the Investor Questionnaire (as defined below) and, in respect of any subscription set forth in Section 3 hereof, the Subscriber shall, no later than one Business Day before the date of the Merger Closing (the “Funding Date”), cause a wire transfer to be made for payment for the Subject Shares in immediately available funds in the amount equal to (i) the Trust Price (in the case of a subscription pursuant to Section 3(a)) or (ii) $10.00 (in the case of a subscription pursuant to Section 3(b)), multiplied, in each case, by the number of Subject Shares to be purchased by such Subscriber pursuant to each respective above subscription (the “Subscription Amount”), in each case in accordance with the Subscription Instructions set forth on Exhibit A hereto. The payments provided for in this Section 4(a) shall be maintained in escrow with Continental Stock Transfer & Trust Company (or other nationally recognized escrow agent with whom in all cases, whether with Continental Stock Transfer & Trust Company or otherwise, the Company shall have an escrow agreement in place for purposes hereof, which such agreement shall be on reasonable and customary terms) pending the Merger Closing.

(b) The consummation of the subscription of the Subscriber for the Subject Shares shall occur (and shall not otherwise occur except) when (i) the Company has confirmed to the Subscriber that the Company’s representations and warranties contained herein are, or shall be, true and correct as of the date of the acceptance of such subscription (which confirmation shall be deemed to have occurred upon the Company’s consummation of such subscription) and (ii) there occurs the subsequent substantially simultaneous Merger Closing. If the consummation of the Subscription does not occur on or prior to the earliest of (x) the Merger Closing or (y) the date on which the Merger Agreement is terminated in accordance with its terms (the “Termination Date”), the Subscriber’s subscription shall automatically be deemed rejected (the “Subscription Rejection”).

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(c) The payment of the Subscription Amount (or a portion thereof, as applicable) will be returned promptly (and, in any event, within three (3) Business Days), without interest, to the Subscriber if the applicable subscription is rejected in whole or in part or if the Common Offering is withdrawn or canceled or the Company elects not to consummate the Common Offering.

(d) The representations and warranties of the Company and the Subscriber set forth herein shall be true and correct as of the date that the Company accepts the subscription set forth herein.

5. Expenses. Each party hereto shall pay all of its own expenses in connection with this Agreement and the transactions contemplated hereby.

6. Representations, Warranties, Understandings, Risk Acknowledgments, and Covenants of the Subscriber. The Subscriber hereby represents, warrants and covenants to the Company as follows:

(a) The Subscriber is purchasing the Subject Shares for its own account, not as a nominee or agent, for investment purposes and not with a view towards distribution or resale within the meaning of the Securities Act (absent the registration of the Subject Shares for resale under the Securities Act or a valid exemption from registration). The Subscriber will not sell, assign or transfer such shares or securities at any time in violation of the Securities Act or applicable state securities laws. The Subscriber acknowledges that the Subject Shares cannot be sold unless subsequently registered under the Securities Act and applicable state securities laws or an exemption from such registration is available.

(b) The Subscriber understands that (A) the Subject Shares (1) have not been registered under the Securities Act or any state securities laws, (2) have been offered and will be sold in reliance upon an exemption from the registration and prospectus delivery requirements of the Securities Act, (3) will be issued in reliance upon exemptions from the registration and prospectus delivery requirements of state securities laws which relate to private offerings and (4) must be held indefinitely because of the fact that the Subject Shares have not been registered under the Securities Act or applicable state securities laws, and (B) the Subscriber must therefore bear the economic risk of its investment hereunder indefinitely unless a subsequent disposition thereof is registered under the Securities Act and applicable state securities laws or is exempt therefrom. The Subscriber further understands that such exemptions depend upon, among other things, the bona fide nature of the investment intent of the Subscriber expressed herein. Pursuant to the foregoing, the Subscriber acknowledges that until such time as the resale of the Subject Shares have been registered under the Securities Act or otherwise may be sold pursuant to an exemption from registration, the certificates representing any Subject Shares acquired by the Subscriber shall bear a restrictive legend substantially as follows (and a stop-transfer order may be placed against transfer of the certificates evidencing such Subject Shares):

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“THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES LAWS OF ANY STATE OR OTHER JURISDICTION, AND MAY NOT BE TRANSFERRED IN VIOLATION OF SUCH ACT AND LAWS.

THE SALE, PLEDGE, HYPOTHECATION, OR TRANSFER OF THE SECURITIES REPRESENTED HEREBY ARE SUBJECT TO THE TERMS AND CONDITIONS OF A CERTAIN SUBSCRIPTION AGREEMENT BY AND AMONG THE HOLDER AND THE OTHER PARTIES THERETO. COPIES OF SUCH AGREEMENT MAY BE OBTAINED UPON WRITTEN REQUEST TO THE SECRETARY OF THE COMPANY.

(c) The Subscriber has knowledge, skill and experience in financial, business and investment matters relating to an investment of this type and is capable of evaluating the merits and risks of such investment and protecting the Subscriber’s interest in connection with the acquisition of the Subject Shares and Backstop Shares (together, the “Securities”). The Subscriber understands that the acquisition of the Securities is a speculative investment and involves substantial risks and that the Subscriber could lose its entire investment. Further, the undersigned has (i) carefully read and considered the risks identified in the Disclosure Documents (as defined below) and (ii) carefully considered the risks related to the Merger, the Company and Vivint and has taken full cognizance of and understands all of the risks related to the Company, Vivint, the Merger, the Securities and the transactions contemplated hereby, including, without limitation, the purchase of the Securities. Acknowledging the very significant tax impact analysis and other analyses that is warranted in determining the consequences to it of purchasing and owning the Securities, to the extent deemed necessary by the Subscriber, the Subscriber has had the opportunity to retain, at its own expense, and relied upon, appropriate professional advice regarding the investment, tax and legal merits and consequences of the foregoing, including, without limitation, purchasing and owning the Securities. The Subscriber has the ability to bear the economic risks of the Subscriber’s investment in the Company, including a complete loss of the investment, and the Subscriber has no need for liquidity in such investment.

(d) The Subscriber has been furnished by the Company all information (or provided access to all information it reasonably requested) regarding the business and financial condition of the Company and Vivint, the Company’s expected plans for future business activities, and the merits and risks of an investment in the Securities which the Subscriber has reasonably requested or otherwise needs to evaluate the investment in the Securities.

(e) The Subscriber is in receipt of and has carefully read and understands the following items (collectively, the “Disclosure Documents”):

(i) the final prospectus of the Company in connection with its IPO, dated October 18, 2017, as filed with the SEC (the “Final Prospectus”);

(ii) each filing made by the Company with the SEC following the filing of the Final Prospectus;

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(iii) the Merger Agreement (including any amendment thereto), a copy of which has been filed by the Company with the SEC; and (iv) the Proxy Statement (including any supplement thereto) and the amendments to the Certificate of Incorporation of the Company proposed to be voted on pursuant thereto, a copy of which has been filed by the Company with the SEC.

The Subscriber understands the significant extent to which certain of the disclosures contained in items (i) and (ii) above shall no longer apply following the Closing in accordance with the Merger Agreement.

The Subscriber acknowledges that neither the Company nor any of its Affiliates has made or makes any representation or warranty to the Subscriber in respect of the Company or Vivint, the Merger, the Company upon, or relating to, the Merger, other than in the case of the Company, the representations and warranties contained in this Agreement or any other agreement between the Company and the Subscriber.

(f) In making its investment decision to purchase the Securities, the Subscriber is relying solely on investigations made by the Subscriber and the Subscriber’s representatives. The offer to sell or assign the Securities was communicated to the Subscriber in such a manner that the Subscriber was able to ask questions of and receive answers from the management of the Company concerning the terms and conditions of the proposed transaction and that at no time was the Subscriber presented with or solicited by or through any advertisement, article, leaflet, public promotional meeting, notice or other communication published in any newspaper, magazine or similar media or broadcast over television or radio or presented at any seminar or meeting or any other form of general or public advertising or solicitation.

(g) The Subscriber acknowledges that it has been advised that:

(i) The Securities have not been approved or disapproved by the SEC or any state securities commission nor has the SEC or any state securities commission passed upon the accuracy or adequacy of any representations by the Company. Any representation to the contrary is a criminal offense.

(ii) In making an investment decision, the Subscriber must rely on its own examination of the Company, the Merger, Vivint, the Securities and the Common Offering, including the merits and risks involved. The Securities have not been recommended by any federal or state securities commission or regulatory authority. Furthermore, the foregoing authorities have not confirmed the accuracy or determined the adequacy of any representation. Any representation to the contrary is a criminal offense.

(iii) The Securities will be “restricted securities” within the meaning of Rule 144 under the Securities Act, are subject to restrictions on transferability and resale and may not be transferred or resold except as permitted under the Securities Act and applicable state securities laws, pursuant to registration or exemption therefrom. The Subscriber is aware of the provisions of Rule 144 are not currently available and, in the future, may not become available for resale of any of the Subject Shares and that the Company is an issuer subject to Rule 144(i) under the Securities Act. The Subscriber is aware that it may be required to bear the financial risks of this investment for an indefinite period of time.

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(h) The Subscriber agrees to furnish the Company with such other information as the Company may reasonably request in order to verify the accuracy of the information contained herein and agrees to notify the Company immediately of any material change in the information provided herein that occurs prior to the acceptance of this Agreement by the Company.

(i) The Subscriber further represents and warrants that it is a “qualified institutional buyer” within the meaning of Rule 144A under the Securities Act, or an “accredited investor” within the meaning of Rule 501 of Regulation D under the Securities Act, and such Subscriber has executed the Investor Questionnaire attached hereto as Exhibit B (the “Investor Questionnaire”) and shall provide to the Company an updated Investor Questionnaire for any change in circumstances at any time on or prior to the Merger Closing.

(j) As of the date of this Agreement, the Subscriber and its Affiliates do not have, and during the 30 day period prior to the date of this Agreement, the Subscriber and its Affiliates have not, in a seller, transferor or other similar capacity, entered into, any “put equivalent position” as such term is defined in Rule 16a-1 of under the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or short sale positions with respect to the securities of the Company. In addition, the Subscriber shall comply with all applicable provisions of Regulation M promulgated under the Securities Act.

(k) (i) The Subscriber has the full legal right and power and all authority and approval required (a) to execute and deliver, or authorize execution and delivery of, this Agreement and all other instruments executed and delivered by or on behalf of the Subscriber in connection with the purchase of the Securities, (b) to delegate authority pursuant to power of attorney and (c) to purchase and hold such Securities; (ii) the signature of the party signing on behalf of the Subscriber is binding upon the Subscriber; and (iii) the Subscriber has not been formed for the specific purpose of acquiring such Securities unless each beneficial owner of such entity is a “qualified institutional buyer” within the meaning of Rule 144A under the Securities Act, or is qualified as an accredited investor within the meaning of Rule 501(a) of Regulation D promulgated under the Securities Act and has submitted information substantiating such individual qualification.

(l) This Agreement has been duly authorized, executed and delivered by the Subscriber and constitutes a legal, valid and binding obligation of the Subscriber enforceable against the Subscriber in accordance with its terms, except as such enforceability may be limited by: (i) applicable bankruptcy, insolvency, reorganization, moratorium or other similar laws in effect that limit creditors’ rights generally; (ii) equitable limitations on the availability of specific remedies; (iii) principles of equity (regardless of whether such enforcement is considered in a proceeding in law or in equity); and (iv) to the extent rights to indemnification and contribution may be limited by federal securities laws or the public policy underlying such laws.

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(m) The Subscriber understands and confirms that the Company will rely on the representations and covenants contained herein in effecting the transactions contemplated by this Agreement and the other Transaction Documents (as defined herein). All representations and warranties provided to the Company furnished by or on behalf of the Subscriber, taken as a whole, are true and correct and do not contain any untrue statement of material fact or omit to state any material fact necessary in order to make the statements made therein, in the light of the circumstances under which they were made, not misleading.

(n) Neither the Subscriber nor, to the extent it has them, any of its shareholders, members, managers, general or limited partners, directors, Affiliates or executive officers (collectively with such Subscriber, the “Subscriber Covered Persons”), are subject to any of the “Bad Actor” disqualifications described in Rule 506(d) under the Securities Act (a “Disqualification Event”), except for a Disqualification Event covered by Rule 506(d)(2) or (d)(3).

(o) The Subscriber has exercised reasonable care to determine whether any Subscriber Covered Person is subject to a Disqualification Event.

(p) The purchase of Securities by the Subscriber will not subject the Company to any Disqualification Event.

(q) Waiver Against Trust. The Subscriber acknowledges that the Company is a blank check company with the powers and privileges necessary or convenient to the conduct, promotion or attainment of the business or purposes of the Company, including, but not limited to, effecting a merger, capital stock exchange, asset acquisition, stock purchase, reorganization or similar business combination involving the Company and one or more businesses. The Subscriber hereby acknowledges that the Company established the trust account at J.P. Morgan Chase Bank, N.A. (the “Trust Account”), maintained by Continental Stock Transfer & Trust Company, a New York corporation, acting as trustee, pursuant to the Investment Management Trust Agreement, dated October 18, 2017, by and between the Company and the trustee, for the benefit of its public shareholders upon the closing of its initial public offering. For and in consideration of the Company entering into this Agreement, the receipt and sufficiency of which are hereby acknowledged, the Subscriber hereby irrevocably waives any and all right, title and interest, or any claim of any kind it has or may have in the future, in or to any monies held in the Trust Account, and agrees not to seek recourse against the Trust Account as a result of, or arising out of, this Agreement.

7. Representations and Warranties of the Company. The Company represents and warrants to each of the Subscribers as follows:

(a) Subject to obtaining all required approvals necessary in connection with the performance of the Merger Agreement (including the approval of the Company’s stockholders for the Merger Agreement and the related transactions) and any required approvals pursuant to the applicable rules of the NYSE (together, the “Required Approvals”), the Company has all requisite corporate power and authority to enter into and perform this Agreement and the Merger Agreement (collectively, the “Transaction Documents”), and to perform its obligations under this Agreement and the other Transaction Document. Subject to obtaining the Required Approvals, the execution, delivery and performance of this Agreement and the other Transaction Documents by the Company and the consummation by it of the transactions contemplated hereby and thereby have been duly and validly authorized by all requisite corporate action, and no other

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proceedings on the Company’s part are necessary to authorize the execution, delivery or performance of this Agreement and the other Transaction Documents. This Agreement and each of the other Transaction Documents have been duly executed and delivered by the Company, and, assuming that this Agreement constitute a valid and binding obligation of the Subscriber, this Agreement and each of the other Transaction Documents will constitute upon execution and delivery by the Company, a legal, valid and binding obligation of the Company enforceable against the Company in accordance with its terms, except as such enforceability may be limited by: (i) applicable bankruptcy, insolvency, reorganization, moratorium or other similar laws in effect that limit creditors’ rights generally; (ii) equitable limitations on the availability of specific remedies; (iii) principles of equity (regardless of whether such enforcement is considered in a proceeding in law or in equity); and (iv) to the extent rights to indemnification and contribution may be limited by federal securities laws or the public policy underlying such laws.

(b) Subject to obtaining the Required Approvals, the execution, delivery and performance of this Agreement and the other Transaction Documents by the Company and the consummation by the Company of the transactions contemplated hereby and thereby will not (i) conflict with or result in a violation of any provision of the Company’s certificate of incorporation and bylaws, as currently in effect, (ii) violate or conflict with, or result in a breach of any provision of, or constitute a default (or an event which with notice or lapse of time or both could become a default) under, or give to others any rights of termination, amendment, acceleration or cancellation of, any material agreement, to which the Company is a party, or (iii) result in a violation of any law applicable to the Company or by which any property or asset of the Company is bound or affected (except for such conflicts, defaults, terminations, amendments, accelerations, cancellations and violations in clauses (ii) or (iii) of this Section 7(b) as have not had or would not reasonably be expect to have, individually or in the aggregate, a material adverse effect on the business, properties, condition or prospects (financial or otherwise) or results of operations of the Company (“Material Adverse Effect”)).

(c) Except as required by the Exchange Act, the rules of the NYSE, and the terms of the Merger Agreement, the Company is not required to submit any notice, report or other filing with any Governmental Authority in connection with the execution, delivery or performance by it of the Transaction Documents or the consummation of the transactions contemplated by the Transaction Documents and no consent, approval or authorization of any Governmental Authority or any other Person is required to be obtained by the Company in connection with its execution, delivery and performance of this Agreement and each of the other Transaction Documents or the consummation of the transactions contemplated hereby and thereby, (other than such consents, approvals or authorizations, the failure of which to obtain, have not had and would not reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect).

(d) The Company understands and confirms that the Subscriber will rely on the representations and covenants contained herein in effecting the transactions contemplated by this Agreement.

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8. Understandings. The Subscriber understands, acknowledges and agrees with the Company as follows:

(a) The Subscriber hereby acknowledges and agrees that the subscription hereunder is irrevocable by the Subscriber, that, except as required by law, the Subscriber is not entitled to cancel, terminate or revoke this Agreement or any agreements of the Subscriber hereunder, and that this Agreement and such other agreements shall survive the death, disability, liquidation or dissolution of the Subscriber and shall be binding upon and inure to the benefit of the parties and their respective heirs, executors, administrators, successors, legal representatives and permitted assigns.

(b) No federal or state agency has made any finding or determination as to the accuracy or adequacy of the Disclosure Documents or as to the suitability of this offering for investment nor any recommendation or endorsement of the Securities.

(c) The offering is intended to be exempt from registration under the Securities Act, which is dependent upon the truth, completeness and accuracy of the statements made by the Subscriber herein.

(d) There is only a limited public market for the Common Stock. There can be no assurance that the Subscriber will be able to sell or dispose of the Securities.

(e) In the event that the Merger is not completed by January 23, 2020, the Company will be required to liquidate and to cease its activities.

(f) The representations and warranties of the Subscriber contained in this Agreement and in any other writing delivered in connection with the transactions contemplated hereby shall be true and correct in all respects on and as of the date hereof and the date of the consummation of each offering of the Subject Shares as if made on and as of such date and such representation and warranties and all agreements of the Subscriber contained herein and in any other writing delivered in connection with the transactions contemplated hereby.

9. Survival. All representations, warranties and covenants contained in this Agreement shall survive until the earlier of the (A) Merger Closing or (B) Termination Date. The Subscriber acknowledges the meaning and legal consequences of the representations, warranties and covenants contained herein and that the Company has relied upon such representations, warranties and covenants in determining the Subscriber’s qualification and suitability to purchase or acquire the Securities.

10. Notices. All notices and other communications provided for herein shall be in writing and shall be deemed to have been duly given if and when delivered personally or two Business Days after being sent by registered or certified mail, return receipt requested, postage prepaid or one Business Day after it is delivered by a commercial overnight carrier or upon confirmation if delivered by facsimile or email:

375 Park Avenue

New York, NY 10162

Attn: David M. Maura

E-mail: dmaura@mosaicac.com

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with a copy to:

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

Vivint Smart Home, Inc.

4931 North 300 West

Provo, UT 84604

Attention: Todd Pederson

Alex Dunn

Shawn J. Lindquist

E-mail: tpedersen@vivint.com

adunn@vivint.com

slindquist@vivint.com

with a copy to:

Simpson Thacher & Bartlett LLP

425 Lexington Avenue

New York, NY 10017

Attn: Wilson S. Neely

Elizabeth A. Cooper

E-mail: wneely@stblaw.com

ecooper@stblaw.com

11. Notification of Changes. The Subscriber agrees and covenants to notify the Company immediately upon the occurrence of any event prior to the Merger Closing that would cause any representation, warranty, covenant or other statement contained in this Agreement to be false or incorrect or of any change in any statement made herein occurring prior to the Merger Closing.

12. Obligations Irrevocable. Subject to the terms and conditions contained herein, unless this Agreement is terminated in accordance with its terms, the obligations of the Subscriber to make its subscription provided for hereunder shall be irrevocable, except with the consent of both the Company and Vivint, until the Subscription Rejection.

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13. Assignability; Amendments; Waiver. The Company may not assign either this Agreement or any of its rights, interests or obligations hereunder without the prior written consent of the Subscriber and Vivint. The Subscriber may assign this Agreement and any of its rights, interests or obligations hereunder (including the Subscriber’s rights to purchase the Subject Shares) to Fortress Mosaic Investor LLC; provided, however, that any such assignment shall not relieve the Subscriber of its obligations under this Agreement in the event that such assignee of the Subscriber fails to perform its obligations hereunder and that, without the prior written consent of the Company and Vivint, such assignee shall not be permitted to further assign any such rights, interests or obligations assigned to it. This Agreement may not be amended, modified or terminated except by an instrument in writing signed by the Company, Vivint and the Subscriber. This Agreement may not be waived except by an instrument in writing signed by the party against whom enforcement of waiver is sought.

14. Binding Effect. Except as otherwise provided herein, this Agreement shall be binding upon and inure to the benefit of the parties and their heirs, successors and assigns, and the agreements, representations, warranties and acknowledgments contained herein shall be deemed to be made by and be binding upon such heirs, executors, administrators, successors, legal representatives and assigns. This Agreement does not confer any rights or remedies upon any person or entity other than the parties hereto and their heirs, successors and permitted assigns; provided, however, that notwithstanding anything to the contrary herein, the Company, Vivint and the Subscriber acknowledges that money damages would not be an adequate remedy at law if any party fails to perform in any material respect any of its obligations hereunder and accordingly agree that each party, in addition to any other remedy to which it may be entitled at law or in equity, shall be entitled to seek an injunction or similar equitable relief restraining such party from committing or continuing any such breach or threatened breach or to seek to compel specific performance of the obligations of any other party under this Agreement, without the posting of any bond, in accordance with the terms and conditions of this Agreement in any court of the United States or any State thereof having jurisdiction, and if any action should be brought in equity to enforce any of the provisions of this Agreement, none of the parties hereto shall raise the defense that there is an adequate remedy at law.

15. Agreement. This Agreement constitutes the entire agreement of the Subscriber, Vivint and the Company relating to the matters contained herein, superseding all prior contracts or agreements, whether oral or written. The headings of this Agreement are for convenience of reference and shall not form part of, or affect the interpretation of, this Agreement.

16. Governing Law; Jurisdiction; WAIVER OF JURY TRIAL. This Agreement shall be governed by and construed in accordance with the laws of the State of Delaware, without regard to the principles of conflicts of law thereof that would require the application of the laws of any jurisdiction other than Delaware. Each party hereto hereby, and any person asserting rights as a third party beneficiary hereunder may do so only if he, she or it, irrevocably agrees that any claims shall be brought only to the exclusive jurisdiction of the courts of the State of Delaware located in New Castle County or, if such courts decline to exercise jurisdiction, any federal or state court located in New York County, New York, and each party hereby consents to the jurisdiction of such courts (and of the appropriate appellate courts therefrom) in any such suit, action or proceeding and irrevocably waives, to the fullest extent permitted by law, any objection that it may now or hereafter have to the laying of the venue of any such suit, action or proceeding

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in any such court or that any such suit, action or proceeding that is brought in any such court has been brought in an inconvenient forum. During the period a claim that is filed in accordance with this Section 16 is pending before a court, all actions, suits or proceedings with respect to such claim or any other claim, including any counterclaim, cross-claim or interpleader, shall be subject to the exclusive jurisdiction of such court. Each party and any person asserting rights as a third party beneficiary may do so only if he, she or it hereby waives, and shall not assert as a defense in any claim, that (a) such party is not personally subject to the jurisdiction of the above named courts for any reason, (b) such action, suit or proceeding may not be brought or is not maintainable in such court, (c) such party’s property is exempt or immune from execution, (d) such action, suit or proceeding is brought in an inconvenient forum, or (e) the venue of such action, suit or proceeding is improper. A final judgment in any action, suit or proceeding described in this Section 16 following the expiration of any period permitted for appeal and subject to any stay during appeal shall be conclusive and may be enforced in other jurisdictions by suit on the judgment or in any other manner provided by law. EACH PARTY HERETO HEREBY WAIVES TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY WITH RESPECT TO ANY ACTION DIRECTLY OR INDIRECTLY ARISING OUT OF, UNDER OR IN CONNECTION WITH THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY.

17. Severability. If any provision of this Agreement or the application thereof to any person or any circumstance shall be held invalid or unenforceable to any extent, the remainder of this Agreement and the application of such provision to other subscriptions or circumstances shall not be affected thereby and shall be enforced to the greatest extent permitted by law.

18. Construction. The headings in this Agreement are inserted for convenience and identification only and are not intended to describe, interpret, define, or limit the scope, extent or intent of this Agreement or any provision hereof. The rule of construction that an agreement shall be construed strictly against the drafter shall not apply to this Agreement.

19. Further Assurances. From time to time, at another party’s request and without further consideration (but at the requesting party’s reasonable cost and expense), each party shall execute and deliver such additional documents and take all such further action as may be reasonably necessary to consummate the transactions contemplated by this Agreement.

20. Counterparts; Facsimile. This Agreement may be executed in any number of counterparts, each of which when so executed and delivered shall be deemed to be an original and all of which together shall be deemed to be one and the same agreement. A facsimile or other electronic transmission of this signed Agreement shall be legal and binding on all parties hereto.

21. Interpretation. The headings, titles and subtitles used in this Agreement are for convenience only and are not to be considered in construing or interpreting this Agreement. In this Agreement, unless the context otherwise requires: (i) any pronoun used in this Agreement shall include the corresponding masculine, feminine or neuter forms, and the singular form of nouns, pronouns and verbs shall include the plural and vice versa; (ii) “including” (and with correlative meaning “include”) means including without limiting the generality of any description preceding or succeeding such term and shall be deemed in each case to be followed

13

by the words “without limitation”; (iii) the words “herein,” “hereto,” and “hereby” and other words of similar import in this Agreement shall be deemed in each case to refer to this Agreement as a whole and not to any particular section or other subdivision of this Agreement; and (iv) the term “Dollars” or “$” means United States dollars. The parties have participated jointly in the negotiation and drafting of this Agreement. Consequently, in the event an ambiguity or question of intent or interpretation arises, this Agreement shall be construed as if drafted jointly by the parties hereto, and no presumption or burden of proof shall arise favoring or disfavoring any party by virtue of the authorship of any provision of this Agreement.

22. Counsel. The Subscriber hereby acknowledges that the Company and its counsel represent the interests of the Company and not those of the Subscriber in any agreement (including this Agreement) to which the Company is a party.

[Signature Page to follow]

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

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Accepted and agreed:

DRAWBRIDGE SPECIAL OPPORTUNITIES FUND LP

By: Drawbridge Special Opportunities GP LLC, its General Partner

Address of Subscriber:

c/o Fortress Investment Group LLC

1345 Avenue of the Americas, 46^th Fl.

New York, NY 10105

Attention: General Counsel – Credit Funds

Email: gc.credit@fortress.com

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Exhibit A

Subscription Instructions

The funds to be paid to the Company pursuant to Section 3 hereof shall be transmitted in federal funds by wire transfer to Continental Stock Transfer and Trust Company in accordance with the wire transfer instructions to be provided to the Subscriber and will be maintained in escrow in accordance with Section 4(a) hereof.

Exhibit B

Investor Questionnaire

INVESTOR QUESTIONNAIRE

MOSAIC ACQUISITION CORP.

THIS QUESTIONNAIRE MUST BE ANSWERED FULLY AND RETURNED ALONG WITH YOUR COMPLETED SUBSCRIPTION AGREEMENT IN CONNECTION WITH YOUR PROSPECTIVE PURCHASE OF SHARES FROM MOSAIC ACQUISITION CORP. (THE “COMPANY”).

THE INFORMATION SUPPLIED IN THIS QUESTIONNAIRE WILL BE HELD IN STRICT CONFIDENCE. NO INFORMATION WILL BE DISCLOSED EXCEPT TO THE EXTENT THAT SUCH DISCLOSURE IS REQUIRED BY LAW OR REGULATION, OTHERWISE DEMANDED BY PROPER LEGAL PROCESS OR IN LITIGATION INVOLVING THE COMPANY AND ITS CONTROLLING PERSONS.

Capitalized terms used herein without definition shall have the respective meanings given such terms as set forth in the Backstop and Subscription Agreement among the Company, Vivint Smart Home, Inc. and the subscriber signatory thereto (the “Agreement”).

(1) The undersigned represents and warrants that he, she or it comes within at least one category marked below, and that for any category marked, he, she or it has truthfully set forth, where applicable, the factual basis or reason the undersigned comes within that category. The undersigned agrees to furnish any additional information which the Company reasonably deems necessary in order to verify the answers set forth below.

2

3

Are you affiliated or associated with a member of FINRA (please check one):

YES          NO         

If Yes, please describe:

The undersigned FINRA firm acknowledges receipt of the notice required by the Conduct Rules of FINRA.

Name of NASD Member Firm

[Remainder of page intentionally left blank]

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The undersigned is informed of the significance to the Company of the foregoing representations and answers contained in this Investor Questionnaire and such answers have been provided under the assumption that the Company will rely on them.

Date: December 18, 2019

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Exhibit 10.4

Execution Version

This AMENDMENT NO. 1, dated as of December 18, 2019 (this “Amendment”), to the Forward Purchase Agreement, dated as of September 26, 2017 (the “Forward Purchase Agreement”), by and among Mosaic Acquisition Corp., a Delaware corporation (“Mosaic”), Mosaic Sponsor, LLC, Fortress Mosaic Sponsor LLC (together with Mosaic Sponsor, LLC, the “Sponsors”) and the party listed as the purchaser of the signature page hereof (the “Purchaser”), is made and entered into by and among Mosaic, the Sponsors, the Purchaser and Vivint Smart Home, Inc. (“Vivint” and, together with Mosaic, the Sponsors and the Purchaser, the “Parties”).

RECITALS

WHEREAS, Mosaic, the Sponsors and the Purchaser (collectively, the “Original Parties”) previously entered into the Forward Purchase Agreement;

WHEREAS, Mosaic, Vivint and Maiden Merger Sub, Inc. (“Merger Sub”) intend to enter into an amendment (the “Merger Amendment”) to that certain Agreement and Plan of Merger, dated September 15, 2019, by and among Mosaic, Vivint and Merger Sub;

WHEREAS, the Original Parties are entering into this Amendment as an inducement to Vivint’s entry into the Merger Amendment; and

WHEREAS, each of the Original Parties desires to amend the Forward Purchase Agreement pursuant to Section 11(m) of the Forward Purchase Agreement as provided herein and to add Vivint as a party to the Forward Purchase Agreement.

NOW, THEREFORE, in consideration of these premises and of the mutual agreements contained herein and for other good and valuable consideration, the sufficiency and receipt of which are hereby acknowledged, the Parties agree as follows:

“The Company has required the Purchaser to purchase the number of Forward Purchase Shares provided pursuant to Section 1(a)(i) hereof by delivering notice to the Purchaser specifying the number of Forward Purchase Shares the Purchaser is required to purchase, the anticipated date of the Business Combination Closing, the aggregate FPS Purchase Price and instructions for wiring the FPS Purchase Price to an account of a third-party escrow agent, which is the Company’s transfer agent (the “Escrow Agent”), pursuant to an escrow agreement between the Company and the Escrow Agent (the “Escrow Agreement”), which may also include Vivint Smart Home, Inc. (“Vivint”) as a party and which shall provide that Vivint shall have the right to provide instructions to the Escrow Agent with respect to the Escrow Agreement in the event all conditions for release of funds have been met for at least 24 hours and the independent members of the Company’s board of directors have not alleged a breach of a condition for release of funds that would excuse a failure to release such funds. On or prior to December 17, 2019, the Purchaser has delivered the FPS Purchase Price in cash via wire transfer to the account specified in such notice, to be held in escrow pending the Business Combination

Closing. The Escrow Agreement will provide that the Escrow Agent shall automatically return to the Purchaser the FPS Purchase Price at the earlier of (i) January 23, 2020 and (ii) the date that certain Agreement and Plan of Merger, dated September 15, 2019, by and among the Company, Vivint Smart Home, Inc. and Maiden Merger Sub, Inc., as may be amended, modified or supplemented from time to time, is validly terminated, provided that the return of the funds placed in escrow shall not terminate this Agreement or otherwise relieve either party of any of its obligations hereunder. For the purposes of this Agreement, “Business Day” means any day, other than a Saturday or a Sunday, that is neither a legal holiday nor a day on which banking institutions are generally authorized or required by law or regulation to close in the City of New York, New York.”

[Signature Page Follows]

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IN WITNESS WHEREOF, the Parties have caused this Amendment to be executed and delivered as of the date first written above by their respective officers thereunto duly authorized.

[Signature Page to Amendment No. 1 to the Forward Purchase Agreement]

IN WITNESS WHEREOF, the Parties have caused this Amendment to be executed and delivered as of the date first written above by their respective officers thereunto duly authorized.

[Signature Page to Amendment No. 1 to the Forward Purchase Agreement]

IN WITNESS WHEREOF, the Parties have caused this Amendment to be executed and delivered as of the date first written above by their respective officers thereunto duly authorized.

[Signature Page to Amendment No. 1 to the Forward Purchase Agreement]

IN WITNESS WHEREOF, the Parties have caused this Amendment to be executed and delivered as of the date first written above by their respective officers thereunto duly authorized.

[Signature Page to Amendment No. 1 to the Forward Purchase Agreement]