FORM 3
        	UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES
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                      	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	                      	

1. Name and Address of Reporting Person *

313 Acquisition LLC	2. Date of Event Requiring Statement (MM/DD/YYYY)
1/17/2020 
	3. Issuer Name and Ticker or Trading Symbol

Vivint Smart Home, Inc. [VVNT]	
(Last)       (First)       (Middle)

C/O THE BLACKSTONE GROUP INC., 345 PARK AVENUE	4. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                          ___X___ 10% Owner
_____ Officer (give title below)        _____ Other (specify below)	
(Street)

NEW YORK, NY 10154      

(City)             (State)             (Zip)	5. If Amendment, Date Original Filed(MM/DD/YYYY)
 
	6. Individual or Joint/Group Filing(Check Applicable Line)

___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person	

Table I - Non-Derivative Securities Beneficially Owned	
1.Title of Security
(Instr. 4)	2. Amount of Securities Beneficially Owned
(Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)	4. Nature of Indirect Beneficial Ownership
(Instr. 5)	
Class A Common Stock 	78651119 (1)(2)	I 	See Footnote (3)(6)(9)(10)(11)	
Class A Common Stock 	9995784 	I 	See Footnote (4)(6)(9)(10)(11)	
Class A Common Stock 	4216 	I 	See Footnote (5)(6)(9)(10)(11)	

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)	
1. Title of Derivate Security
(Instr. 4)	2. Date Exercisable and Expiration Date
(MM/DD/YYYY)	3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)	6. Nature of Indirect Beneficial Ownership
(Instr. 5)	
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares				
Earnout Rights 	 (7)(8)	1/17/2025 	Class A Common Stock 	28615601 (1)(2)	 (7)(8)	I 	See Footnote (3)(6)(9)(10)(11)	

Explanation of Responses:	
(1) 	These securities were acquired 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 Vivint Smart Home"), Mosaic Acquisition Corp. ("Mosaic") and Maiden Merger Sub, Inc. ("Merger Sub"), pursuant to which 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").	
(2) 	Pursuant to the terms of the Merger Agreement, the stockholders of Legacy Vivint Smart Home at the effective time of the Merger (the "Effective Time") received 84.5320916792 shares of Class A common stock of the Issuer ("Class A Common Stock") for each share of common stock of Legacy Vivint Smart Home held by them immediately prior to the Effective Time and certain rights to additional shares of Class A Common Stock upon the achievement of certain milestones as described in the Merger Agreement (the "Earnout Rights").	
(3) 	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.	
(4) 	Reflects securities held directly by BCP Voyager Holdings LP.	
(5) 	Reflects securities held directly by Blackstone Family Investment Partnership VI L.P.	
(6) 	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.	
(7) 	Reflects Earnout Rights acquired pursuant to the Merger Agreement. 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.	
(8) 	Of these Earnout Rights, one-third will be issued if the volume-weighted average price of the Class A Common Stock exceeds $12.50 for any 20 trading days within any 30 trading day period, one-third 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, and one-third 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 issuance of such shares are subject to certain adjustments, including pro rata adjustments, set forth in the Merger Agreement.	
(9) 	Due to the limitations of the electronic filing system certain Reporting Persons are filing a separate Form 3.	
(10) 	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.	
(11) 	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.	

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, NY 10154		X			
BCP Voyager Holdings LP
C/O THE BLACKSTONE GROUP INC.
345 PARK AVENUE
NEW YORK, NY 10154		X			
Blackstone Family Investment Partnership VI L.P.
C/O THE BLACKSTONE GROUP INC.
354 PARK AVENUE
NEW YORK, NY 10154		X			
Blackstone Capital Partners VI L.P.
C/O THE BLACKSTONE GROUP INC.
345 PARK AVENUE
NEW YORK, NY 10154		X			
Blackstone Management Associates VI L.L.C.
C/O THE BLACKSTONE GROUP INC.
345 PARK AVENUE
NEW YORK, NY 10154		X			
BMA VI L.L.C.
C/O THE BLACKSTONE GROUP INC.
345 PARK AVENUE
NEW YORK, NY 10154		X			
BCP VI Side-By-Side GP L.L.C.
C/O THE BLACKSTONE GROUP INC.
345 PARK AVENUE
NEW YORK, NY 10154		X			

Signatures		
313 ACQUISITION LLC, By: Blackstone Capital Partners VI L.P., its managing member, By: Blackstone Management Associates VI L.L.C., its GP, By: BMA VI L.L.C., its sole member, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer		1/27/2020	
**Signature of Reporting Person		Date
	
BCP VOYAGER HOLDINGS LP, By: Blackstone Management Associates VI L.L.C., its general partner, By: BMA VI L.L.C., its sole member, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer		1/27/2020	
**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		1/27/2020	
**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		1/27/2020	
**Signature of Reporting Person		Date
	
BMA VI L.L.C., By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer		1/27/2020	
**Signature of Reporting Person		Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.	
*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).	
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).	
Note:	File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.	
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.