Sec Form 4 Filing - 313 Acquisition LLC @ Vivint Smart Home, Inc. - 2020-03-11

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person 313 Acquisition LLC 2. Issuer Name and Ticker or Trading Symbol Vivint Smart Home, Inc. [ VVNT] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O THE BLACKSTONE GROUP INC., 345 PARK AVENUE 3. Date of Earliest Transaction (MM/DD/YY) 03/11/2020 (Street) NEW YORK, NY10154 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Common Stock 03/11/2020 C( 1 )( 2 )( 3 ) 9,542,680 A 97,732,396 I See Footnotes ( 4 ) ( 7 ) ( 8 ) ( 9 ) Class A Common Stock 9,995,784 I See Footnotes ( 5 ) ( 7 ) ( 8 ) ( 9 ) Class A Common Stock 4,216 I See Footnotes ( 6 ) ( 7 ) ( 8 ) ( 9 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Earnout Rights ( 2 ) ( 3 ) 02/26/2020 C( 1 )( 2 )( 3 ) 9,542,472 ( 2 ) ( 3 ) ( 2 )( 3 ) 01/17/2025 Class A Common Stock 9,542,472 ( 2 ) ( 3 ) ( 2 ) ( 3 ) 9,542,472 ( 2 ) ( 3 ) I See Footnotes ( 4 ) ( 7 ) ( 8 ) ( 9 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other 313 Acquisition LLC C/O THE BLACKSTONE GROUP INC. 345 PARK AVENUE NEW YORK, NY10154 X Blackstone Capital Partners VI L.P. C/O THE BLACKSTONE GROUP INC. 345 PARK AVENUE NEW YORK, NY10154 X Blackstone Management Associates VI L.L.C. C/O THE BLACKSTONE GROUP INC. 345 PARK AVENUE NEW YORK, NY10154 X BMA VI L.L.C. C/O THE BLACKSTONE GROUP INC. 345 PARK AVENUE NEW YORK, NY10154 X Blackstone Holdings III L.P. C/O THE BLACKSTONE GROUP INC. 345 PARK AVENUE NEW YORK, NY10154 X Blackstone Holdings III GP L.P. C/O THE BLACKSTONE GROUP INC. 345 PARK AVENUE NEW YORK, NY10154 X Blackstone Holdings III GP Management L.L.C. C/O THE BLACKSTONE GROUP INC. 345 PARK AVENUE NEW YORK, NY10154 X Blackstone Group Inc 345 PARK AVENUE NEW YORK, NY10154 X Blackstone Group Management L.L.C. C/O THE BLACKSTONE GROUP INC. 345 PARK AVENUE NEW YORK, NY10154 X SCHWARZMAN STEPHEN A C/O THE BLACKSTONE GROUP INC. 345 PARK AVENUE NEW YORK, NY10154 X Signatures 313 ACQUISITION LLC, By: Blackstone Capital Partners VI L.P., its managing member, By: Blackstone Management Associates VI L.L.C., its general partner, By: BMA VI L.L.C., its sole member, By: /s/ John G. Finley, Title: Chief Legal Officer 03/13/2020 Signature of Reporting Person Date BLACKSTONE CAPITAL PARTNERS VI L.P., By: Blackstone Management Associates VI L.L.C., its general partner, By: BMA VI L.L.C., its sole member, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 03/13/2020 Signature of Reporting Person Date BLACKSTONE MANAGEMENT ASSOCIATES VI L.L.C., By: BMA VI L.L.C., its sole member, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 03/13/2020 Signature of Reporting Person Date BMA VI L.L.C., By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 03/13/2020 Signature of Reporting Person Date BLACKSTONE HOLDINGS III L.P., By: Blackstone Holdings III GP L.P., its general partner, By: Blackstone Holdings III GP Management L.L.C., its general partner, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 03/13/2020 Signature of Reporting Person Date BLACKSTONE HOLDINGS III GP L.P., By: Blackstone Holdings III GP Management L.L.C., its general partner, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 03/13/2020 Signature of Reporting Person Date BLACKSTONE HOLDINGS III GP MANAGEMENT L.L.C., By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 03/13/2020 Signature of Reporting Person Date THE BLACKSTONE GROUP INC., By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 03/13/2020 Signature of Reporting Person Date BLACKSTONE GROUP MANAGEMENT L.L.C., By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 03/13/2020 Signature of Reporting Person Date /s/ Stephen A. Schwarzman 03/13/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Pursuant to an Agreement and Plan of Merger, dated effective as of September 15, 2019, as amended by that certain Amendment No. 1 and as otherwise amended from time to time (the "Merger Agreement"), by and among Legacy Vivint Smart Home, Inc. (f/k/a Vivint Smart Home, Inc.) ("Legacy Vivin t Smart Home"), Mosaic Acquisition Corp. ("Mosaic") and Maiden Merger Sub, Inc. ("Merger Sub"), Merger Sub merged (the "Merger") with and into Legacy Vivint Smart Home, with Legacy Vivint Smart Home surviving the merger as a wholly owned subsidiary of Mosaic (which subsequently changed its name to "Vivint Smart Home, Inc.", the "Issuer"). The transactions contemplated by the Merger Agreement closed on January 17, 2020. ( 2 )Pursuant to the terms of the Merger Agreement, the stockholders of Legacy Vivint Smart Home at the effective time of the Merger received, among other consideration, certain rights to additional shares of Class A common stock of the Issuer ("Class A Common Stock") upon the achievement of certain milestones as described in the Merger Agreement (the "Earnout Rights"). Pursuant to earnout provisions in the Merger Agreement, the Reporting Person is entitled to receive such shares of Class A Common Stock if, from the closing of the Merger until the fifth anniversary thereof, the volume-weighted average price of the Class A Common Stock exceeds certain thresholds as discussed below. ( 3 )Of these Earnout Rights, one-half will be issued if the volume-weighted average price of the Class A Common Stock exceeds $15.00 for any 20 trading days within any 30 trading day period (the "$15.00 Condition"), and one-half will be issued if the volume-weighted average price of the Class A Common Stock exceeds $17.50 for any 20 trading days within any 30 trading day period (the "$17.50 Condition"). The issuance of such shares are subject to certain adjustments, including pro rata adjustments, set forth in the Merger Agreement. The $15.00 Condition was satisfied on March 11, 2020. ( 4 )Reflects securities held directly by 313 Acquisition LLC. 313 Acquisition LLC is managed by a board of managers and Blackstone Capital Partners VI L.P., as managing member. ( 5 )Reflects securities held directly by BCP Voyager Holdings LP. ( 6 )Reflects securities held directly by Blackstone Family Investment Partnership VI L.P. ( 7 )Blackstone Management Associates VI L.L.C. is the general partner of Blackstone Capital Partners VI L.P. and BCP Voyager Holdings LP. BMA VI L.L.C. is the sole member of Blackstone Management Associates VI L.L.C. BCP VI Side-by-Side GP L.L.C. is the general partner of Blackstone Family Investment Partnership VI L.P. Blackstone Holdings III L.P. is the managing member of BMA VI L.L.C. and the sole member of BCP VI Side-by-Side GP L.L.C. The general partner of Blackstone Holdings III L.P. is Blackstone Holdings III GP L.P. The general partner of Blackstone Holdings III GP L.P. is Blackstone Holdings III GP Management L.L.C. The sole member of Blackstone Holdings III GP Management L.L.C. is The Blackstone Group Inc. The sole holder of the Class C common stock of The Blackstone Group Inc. is Blackstone Group Management L.L.C. Blackstone Group Management L.L.C. is wholly owned by Blackstone's senior managing directors and controlled by its founder, Stephen A. Schwarzman. ( 8 )Information with respect to each of the Reporting Persons is given solely by such Reporting Person, and no Reporting Person has responsibility for the accuracy or completeness of information supplied by another Reporting Person. ( 9 )Each of the Reporting Persons (other than to the extent it directly holds securities reported herein) disclaims beneficial ownership of the securities held by the other Reporting Persons, except to the extent of such Reporting Person's pecuniary interest therein, and, pursuant to Rule 16a-1(a)(4) under the Securities Exchange Act of 1934, each of the Reporting Persons (other than to the extent it directly holds securities reported herein) states that the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 or for any other purpose.

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