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 OF SECURITIES 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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(Print or Type Responses)

1. Name and Address of Reporting Person * Robson David   2. Issuer Name and Ticker or Trading Symbol U.S. Auto Parts Network, Inc. [PRTS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Chief Financial Officer (Last) (First) (Middle) C/O U.S. AUTO PARTS NETWORK, INC., 16941 KEEGAN AVENUE 3. Date of Earliest Transaction (Month/Day/Year) 09/09/2013 (Street) CARSON, CA 90746 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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

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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 (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

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 (Month/Day/Year)

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

Stock Option (Right to Buy)

$ 4.62

09/09/2013

D

300,000

(1)

01/02/2022

Common Stock

300,000

(2)

0

D

Stock Option (Right to Buy)

$ 0.9866

09/10/2013

A

85,714

(3)

09/09/2023

Common Stock

85,714

(2)

85,714

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Robson David C/O U.S. AUTO PARTS NETWORK, INC. 16941 KEEGAN AVENUE CARSON, CA 90746			Chief Financial Officer

Signatures

/s/ Bryan P. Stevenson, as Attorney-in-Fact for David Robson		09/11/2013
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(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)	The cancelled option provided for vesting such that twenty five percent of the shares of stock subject to the option were to vest on January 3, 2013, and thereafter the balance of the option shares were to vest and become exercisable in a series of thirty-six equal monthly installments over the following three year period, so that all of the shares of stock subject to the option were to be vested on January 3, 2016, subject to the reporting person's continued service relationship with the issuer or any subsidiary of the issuer on each such date.
(2)	The reporting person agreed to the cancellation of his outstanding stock option, as reflected in this Form 4, for 300,000 shares of PRTS's common stock granted to the reporting person on January 3, 2012 (the "January 2012 Option") in exchange for a replacement option, for 85,714 shares of PRTS's common stock, having an exercise price of $0.9866 a share, which was granted to the reporting person on September 10, 2013 (the "First Replacement Option"). The reporting person tendered the January 2012 Option pursuant to the terms of the Tender Offer Statement on Schedule TO filed by the Company with the Securities and Exchange Commission on August 12, 2013, as amended, (the "Schedule TO") relating to an offer by the Company to certain employees to exchange outstanding options to purchase shares of common stock based on the exchange ratio of 3.5:1. Upon grant of the First Replacement Option to the reporting person, the January 2012 Option was canceled.
(3)	Twenty-five percent of the shares of stock subject to the option vest on September 10, 2014, and thereafter the balance of the option shares vest and become exercisable in a series of thirty-six equal monthly installments over the following three year period, so that all of the shares of stock subject to the option vest on September 10, 2017, subject to the reporting person's continued service relationship with the issuer or any subsidiary of the issuer on each such date.

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