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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Accel X LP
2. Date of Event Requiring Statement (Month/Day/Year)
08/04/2015
3. Issuer Name and Ticker or Trading Symbol
Sunrun Inc. [RUN]
(Last)
(First)
(Middle)
428 UNIVERSITY AVENUE
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

PALO ALTO, CA 94301
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 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)
Common Stock 313,204
D (1)
 
Common Stock 23,507
I
Held by Accel X Strategic Partners L.P. (2)
Common Stock 12,574
I
Held by Accel Investors 2009 L.L.C. (3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(Month/Day/Year)
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
Series A Preferred Stock   (4)   (4) Common Stock 43,872 $ (4) D (1)  
Series A Preferred Stock   (4)   (4) Common Stock 3,292 $ (4) I Held by Accel X Strategic Partners L.P. (2)
Series A Preferred Stock   (4)   (4) Common Stock 1,761 $ (4) I Held by Accel Investors 2009 L.L.C. (3)
Series B Preferred Stock   (5)   (5) Common Stock 6,613,216 $ (5) D (1)  
Series B Preferred Stock   (5)   (5) Common Stock 496,342 $ (5) I Held by Accel X Strategic Partners L.P. (2)
Series B Preferred Stock   (5)   (5) Common Stock 265,502 $ (5) I Held by Accel Investors 2009 L.L.C. (3)
Series C Preferred Stock   (6)   (6) Common Stock 2,354,097 $ (6) D (1)  
Series C Preferred Stock   (6)   (6) Common Stock 176,681 $ (6) I Held by Accel X Strategic Partners L.P. (2)
Series C Preferred Stock   (6)   (6) Common Stock 94,510 $ (6) I Held by Accel Investors 2009 L.L.C. (3)
Series D Preferred Stock   (7)   (7) Common Stock 323,835 $ (7) D (1)  
Series D Preferred Stock   (7)   (7) Common Stock 24,305 $ (7) I Held by Accel X Strategic Partners L.P. (2)
Series D Preferred Stock   (7)   (7) Common Stock 13,001 $ (7) I Held by Accel Investors 2009 L.L.C. (3)
Series E Preferred Stock   (8)   (8) Common Stock 97,227 $ (8) D (1)  
Series E Preferred Stock   (8)   (8) Common Stock 7,297 $ (8) I Held by Accel X Strategic Partners L.P. (2)
Series E Preferred Stock   (8)   (8) Common Stock 3,903 $ (8) I Held by Accel Investors 2009 L.L.C. (3)

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Accel X LP
428 UNIVERSITY AVENUE
PALO ALTO, CA 94301
    X    
ACCEL X STRATEGIC PARTNERS LP
428 UNIVERSITY AVENUE
PALO ALTO, CA 94301
    X    
Accel Investors 2009 L.L.C.
428 UNIVERSITY AVENUE
PALO ALTO, CA 94301
    X    
Accel X Associates L.L.C.
428 UNIVERSITY AVENUE
PALO ALTO, CA 94301
    X    

Signatures

/s/ Tracy L. Sedlock, Attorney-in-Fact for Accel X L.P. 08/04/2015
**Signature of Reporting Person Date

/s/ Tracy L. Sedlock, Attorney-in-Fact for Accel X Strategic Partners L.P. 08/04/2015
**Signature of Reporting Person Date

/s/ Tracy L. Sedlock, Attorney-in-Fact for Accel Investors 2009 L.L.C. 08/04/2015
**Signature of Reporting Person Date

/s/ Tracy L. Sedlock, Attorney-in-Fact for Accel X Associates L.L.C. 08/04/2015
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) Accel X Associates L.L.C. ("A10A") is the General Partner of Accel X L.P. and has sole voting and investment power. Andrew G. Braccia, James W. Breyer, Kevin J. Efrusy, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong, a director of the Issuer, are the Managing Members of A10A and share such powers. Each Managing Member disclaims beneficial ownership except to the extent of his or her pecuniary interest therein.
(2) A10A is the General Partner of Accel X Strategic Partners L.P. and has sole voting and investment power. Andrew G. Braccia, James W. Breyer, Kevin J. Efrusy, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong, a director of the Issuer, are the Managing Members of A10A and share such powers. Each Managing Member disclaims beneficial ownership except to the extent of his or her pecuniary interest therein.
(3) Andrew G. Braccia, James W. Breyer, Kevin J. Efrusy, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong, a director of the Issuer, are the Managing Members of Accel Investors 2009 L.L.C. and therefore share the voting and investment powers. Each Managing Member disclaims beneficial ownership except to the extent of his or her pecuniary interest therein.
(4) The Series A Preferred Stock is convertible into Common Stock on a 1:1 basis and has no expiration date. Immediately prior to the completion of the Issuer's initial public offering, all shares of Series A Preferred Stock will be converted into shares of Common Stock.
(5) The Series B Preferred Stock is convertible into Common Stock on a 1:1 basis and has no expiration date. Immediately prior to the completion of the Issuer's initial public offering, all shares of Series B Preferred Stock will be converted into shares of Common Stock.
(6) The Series C Preferred Stock is convertible into Common Stock on a 1:1 basis and has no expiration date. Immediately prior to the completion of the Issuer's initial public offering, all shares of Series C Preferred Stock will be converted into shares of Common Stock.
(7) The Series D Preferred Stock is convertible into Common Stock on a 1:1 basis and has no expiration date. Immediately prior to the completion of the Issuer's initial public offering, all shares of Series D Preferred Stock will be converted into shares of Common Stock.
(8) The Series E Preferred Stock is convertible into Common Stock on a 1:1 basis and has no expiration date. Immediately prior to the completion of the Issuer's initial public offering, all shares of Series E Preferred Stock will be converted into shares of Common Stock.

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