X0306 4 2020-03-10 0 0001378950 U.S. Auto Parts Network, Inc. PRTS 0001761840 Peker Lev 16941 KEEGAN AVENUE CARSON CA 90746 1 1 0 0 Chief Executive Officer Common Stock 2020-03-10 4 A 0 433673 0 A 433673 D Common Stock 2020-03-10 4 A 0 109831 0 A 543504 D Common Stock 38869 I By IRA Common Stock 56000 I By Spouse's IRA Represents the vesting of performance-based restricted stock units previously granted to the Reporting Person by the Company on May 22, 2019 under the Company's annual incentive bonus plan. The performance conditions applicable to the award were determined to have been satisfied by the Company's Board of Directors on March 10, 2020, resulting in the immediate vesting of the restricted stock units as to 433,673 shares. Represents common stock awarded to the Reporting Person upon the determination by the Company's Board of Directors of the achievement of the performance conditions under the Company's annual incentive bonus plan. The common stock was awarded to the Reporting Person in lieu of cash under the Company's annual incentive bonus plan. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. /s/ Lev Peker 2020-03-12