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 *

Fortress Investment Group LLC	2. Date of Event Requiring Statement (MM/DD/YYYY)
10/18/2017 
	3. Issuer Name and Ticker or Trading Symbol

Mosaic Acquisition Corp. [MOSC]	
(Last)        (First)        (Middle)

1345 AVENUE OF THE AMERICAS, 46TH FLOOR	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 10105       

(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)	

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				
Class F ordinary shares, par value $0.0001 per share  	  (1)	  (1)	Class A ordinary shares, par value $0.0001 per share  	4297500  	  (1)	I  	See Explanation of Responses   (1) (2) (3) (4)	

Explanation of Responses:	
(1) 	Fortress Mosaic Sponsor LLC ("Sponsor") directly owns 4,297,500 Class F ordinary shares, par value $0.0001 per share (the "Class F Shares"), of Mosaic Acquisition Corp. (the "Issuer"), including 562,500 Class F Shares that are subject to forfeiture if the underwriters of the Issuer's initial public offering do not exercise in full an option granted to it to cover over-allotments. Pursuant to the Amended and Restated Memorandum and Articles of Association of the Issuer, the Class F Shares have no expiration date and (i) are convertible into Class A ordinary shares, par value $0.0001 per share ("Class A Shares"), of the Issuer at any time at the option of the holder on a one-for-one basis and (ii) will automatically convert into Class A Shares at the time of the Issuer's initial business combination on a one-for-one basis, in each case, subject to adjustment.	
(2) 	The managing member of the Sponsor is Principal Holdings I LP ("Holdings"), whose general parter is FIG Asset Co. LLC ("FIG"), whose sole member is Fortress Investment Group LLC ("Fortress" and, together with Sponsor, Holdings and FIG, "the Reporting Persons").	
(3) 	Because of the relationship among the Reporting Persons, the Reporting Persons may be deemed to beneficially own the securities reported herein to the extent of their respective pecuniary interests. Each Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein, if any.	
(4) 	Pursuant to Rule 16a-1(a)(4) under the Exchange Act, this filing shall not be deemed an admission that the Reporting Persons are, for purposes of Section 16 of the Exchange Act or otherwise, the beneficial owners of any equity securities in excess of their respective pecuniary interests.	

Remarks:
Exhibit 99.1 Joint Filer Information, incorporated herein by reference.	

Reporting Owners	
Reporting Owner Name / Address	Relationships	
	Director	10% Owner	Officer	Other	
Fortress Investment Group LLC
1345 AVENUE OF THE AMERICAS
46TH FLOOR
NEW YORK, NY 10105		X			
FIG Asset Co. LLC
1345 AVENUE OF THE AMERICAS
46TH FLOOR
NEW YORK, NY 10105		X			
Principal Holdings I LP
1345 AVENUE OF THE AMERICAS
46TH FLOOR
NEW YORK, NY 10105		X			
Fortress Mosaic Sponsor LLC
1345 AVENUE OF THE AMERICAS
46TH FLOOR
NEW YORK, NY 10105		X			

Signatures		
/s/ David N. Brooks, Authorized Signatory, FORTRESS INVESTMENT GROUP LLC		10/18/2017	
** Signature of Reporting Person		Date
	
/s/ David N. Brooks, Authorized Signatory, FIG ASSET CO. LLC		10/18/2017	
** Signature of Reporting Person		Date
	
/s/ David N. Brooks, Authorized Signatory, PRINCIPAL HOLDINGS I LP		10/18/2017	
** Signature of Reporting Person		Date
	
/s/ David N. Brooks, Authorized Signatory, FORTRESS MOSAIC SPONSOR LLC		10/18/2017	
** 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.	

Exhibit  99.1

Joint Filer Information

Name of Joint Filer:	Fortress Investment Group LLC	
 	 	
Address of Joint Filer:	1345 Avenue of the Americas	
 	46th Floor	
 	New York, NY 10105	
 	 	
Relationship of Joint Filer to Issuer:	10% Owner	
 	 	
Issuer Name and Ticker or Trading Symbol:	Mosaic Acquisition Corp. [MOSC]	
 	 	
Date of Event Requiring Statement:	 	
(Month/Day/Year):	10/18/2017	
 	 	
Designated Filer:	Fortress Investment Group LLC	

Name of Joint Filer:	FIG Asset Co. LLC	
 	 	
Address of Joint Filer:	1345 Avenue of the Americas	
 	46th Floor	
 	New York, NY 10105	
 	 	
Relationship of Joint Filer to Issuer:	10% Owner	
 	 	
Issuer Name and Ticker or Trading Symbol:	Mosaic Acquisition Corp. [MOSC]	
 	 	
Date of Event Requiring Statement:	 	
(Month/Day/Year):	10/18/2017	
 	 	
Designated Filer:	Fortress Investment Group LLC	

Name of Joint Filer:	Principal Holdings I LP	
 	 	
Address of Joint Filer:	1345 Avenue of the Americas	
 	46th Floor	
 	New York, NY 10105	
 	 	
Relationship of Joint Filer to Issuer:	10% Owner	
 	 	
Issuer Name and Ticker or Trading Symbol:	Mosaic Acquisition Corp. [MOSC]	
 	 	
Date of Event Requiring Statement:	 	
(Month/Day/Year):	10/18/2017	
 	 	
Designated Filer:	Fortress Investment Group LLC	

Name of Joint Filer:	Fortress Mosaic Sponsor LLC	
 	 	
Address of Joint Filer:	1345 Avenue of the Americas	
 	46th Floor	
 	New York, NY 10105	
 	 	
Relationship of Joint Filer to Issuer:	10% Owner	
 	 	
Issuer Name and Ticker or Trading Symbol:	Mosaic Acquisition Corp. [MOSC]	
 	 	
Date of Event Requiring Statement:	 	
(Month/Day/Year):	10/18/2017	
 	 	
Designated Filer:	Fortress Investment Group LLC