UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

For the fiscal year ended December 28, 2013

OR

For the transition period from              to             

Commission file number 001-33264

U.S. AUTO PARTS NETWORK, INC.

(Exact Name of Registrant as Specified in Its Charter)

16941 Keegan Avenue, Carson, CA 90746

(Address of Principal Executive Offices) (Zip Code)

Registrant’s Telephone Number, Including Area Code: (310) 735-0085

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  ¨    No  x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ¨    No  x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by a check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.    ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Indicate by check mark whether the registrant is a shell company (as defined in Exchange Act Rule 12b-2).    Yes  ¨    No  x

The aggregate market value of the common stock held by non-affiliates of the registrant as of June 29, 2013 was approximately $24.4 million (based on the closing sales price of the registrant’s common stock on that date). For the purposes of this calculation, shares owned by officers, directors and 10% stockholders known to the registrant have been deemed to be owned by affiliates. This determination of affiliate status is not necessarily a conclusive determination for other purposes.

As of March 6, 2014, there were 33,377,794 shares of the registrant’s common stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of our proxy statement for the 2014 Annual Meeting of Stockholders (the “Proxy Statement”) are incorporated by reference in Part III hereof. Except with respect to information specifically incorporated by reference in this Form 10-K, the Proxy Statement is not deemed to be filed as a part hereof.

U.S. AUTO PARTS NETWORK, INC.

ANNUAL REPORT ON FORM 10-K

FOR THE FISCAL YEAR ENDED DECEMBER 28, 2013

TABLE OF CONTENTS

Unless the context requires otherwise, as used in this report, the terms “U.S. Auto Parts,” the “Company,” “we,” “us” and “our” refer to U.S. Auto Parts Network, Inc. and its subsidiaries.

U.S. Auto Parts^®, U.S. Auto Parts Network™, PartsTrain^®, Partsbin™, Kool-Vue™, Auto-Vend™, JC Whitney^® , and Stylintrucks^TM, amongst others, are our United States trademarks. All other trademarks and trade names appearing in this report are the property of their respective owners.

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

The statements included in this report, other than statements or characterizations of historical or current fact, are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”) and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and we intend that such forward-looking statements be subject to the safe harbors created thereby. Any forward-looking statements included herein are based on management’s beliefs and assumptions and on information currently available to management. We have attempted to identify forward-looking statements by terms such as “anticipates,” “believes,” “could,” “estimates,” “expects,” “intends,” “may,” “plans,” “potential,” “predicts,” “projects,” “should,” “will,” “would”, “will likely continue,” “will likely result” and variations of these words or similar expressions. These forward-looking statements include, but are not limited to, statements regarding future events, our future operating and financial results, financial expectations, expected growth and strategies, current business indicators, capital needs, financing plans, capital deployment, liquidity, contracts, litigation, product offerings, customers, acquisitions, competition and the status of our facilities. Forward-looking statements, no matter where they occur in this document or in other statements attributable to the Company involve known and unknown risks, uncertainties and other factors that may cause our actual results, performance or achievements to be materially different from any future results, performances or achievements expressed or implied by the forward-looking statements. We discuss many of these risks in greater detail under the heading “Risk Factors” in Part I, Item 1A of this report. Given these uncertainties, you should not place undue reliance on these forward-looking statements. You should read this report and the documents that we reference in this report and have filed as exhibits to the report completely and with the understanding that our actual future results may be materially different from what we expect. Also, forward-looking statements represent our management’s beliefs and assumptions only as of the date of this report. Except as required by law, we assume no obligation to update these forward-looking statements publicly, or to update the reasons actual results could differ materially from those anticipated in these forward-looking statements, even if new information becomes available in the future.

PART I

Overview

We are one of the leading online sources for automotive aftermarket parts and repair information. Our vision is that vehicle owners never overpay for service and repair. Our mission is to be the service and repair advocate for vehicle owners, to increase their confidence in the repair process, and to provide the most affordable option for their service and repair needs.

We principally sell our products, identified as stock keeping units (“SKUs”), to individual consumers through our network of websites and online marketplaces. Our user-friendly websites provide customers with a comprehensive selection of approximately 1.5 million SKUs with detailed product descriptions and photographs. We have developed a proprietary product database that maps our SKUs to product applications based on vehicle makes, models and years.

Our online sales channel and relationships with suppliers enable us to eliminate several intermediaries in the traditional auto parts supply chain and offer a broad selection of SKUs. Additionally, as an online retailer, we believe greater economies of scale can be achieved online than in brick and mortar stores.

We were incorporated in Delaware in 1995 as a distributor of aftermarket auto parts and launched our first website in 2000. We then expanded our online operations, increasing the number of SKUs sold through our e-commerce network, adding additional websites, improving our internet marketing proficiency, and commencing sales on online marketplaces. Like most e-commerce retailers, our success depends on our ability to attract online consumers to our websites and convert them into customers in a cost-effective manner. Historically, marketing through search engines provided the most efficient opportunity to reach online auto part buyers. In order to improve our business, we worked towards enhancing the process of consolidation and implementing improvements to our multiple websites in order to improve our ranking on online search results and pursued opportunities in third-party online marketplaces. Our efforts to improve the website purchase experience for our online customers have included our efforts to (1) help our customers find the parts they want to buy through reducing failed searches and increasing user purchase confidence; (2) sell more highly customized accessories by partnering with manufacturers to build custom shopping experiences; (3) increase order size across our sites through improved recommendation engines; and (4) roll out of high quality images and videos with emphasis on accessory product lines. In October 2008, we acquired AutoMD.com for the purpose of developing content and a user community to educate consumers on maintenance and service of their vehicles. The site provides auto information, with tools for diagnosing car troubles, locating repair shops, estimating the cost of repairs, accessing recalls and technical service bulletins, reading do-it-yourself (“DIY”) repair guides, and getting questions answered in the automotive enthusiast community forum. Currently, AutoMD estimates auto repair costs to help consumers understand the costs and time involved in selected repairs and to improve the

consumer’s experience when getting their vehicle serviced. We launched our AutoMd Insta-Quotes! Program in 2013. In locations where service shops were selected to participate in the AutoMD Insta-Quotes! program, AutoMD provides real-time price estimates specific to each participating shop. In locations without the AutoMD Insta-Quotes! program, AutoMD provides general estimates based on industry standard parts and labor data as available for the consumer’s location.

In August 2010, we acquired all of the issued and outstanding shares of Automotive Specialty Accessories and Parts, Inc. and its wholly-owned subsidiary Whitney Automotive Group, Inc. (referred to herein as “WAG”), at the time, the nation’s leading catalog and internet direct marketer of automotive aftermarket performance parts and accessories. This acquisition has expanded our product line into all terrain vehicles, recreational vehicles and motorcycles, as well as provided us deep product knowledge into niche segments like Jeep, Volkswagen and trucks. The expansion of our product line increases our ability to reach customers in the DIY automobile and off-road accessories market.

Our flagship websites are located at www.autopartswarehouse.com, www.jcwhitney.com and www.AutoMD.com and our corporate website is located at www.usautoparts.net.

Our Products

We offer a broad selection of aftermarket auto parts. We frequently refine our product offering by introducing new merchandise and updating the existing product selection to offer a more complete and relevant product lines and to remove low-selling or obsolete SKUs. We broadly classify our products into three categories: body parts, engine parts, and performance parts and accessories.

Body Parts. The body parts category is primarily comprised of parts for the exterior of an automobile. Our parts in this category are typically replacement parts for original body parts that have been damaged as a result of a collision or through general wear and tear. The majority of these products are sold through our websites. In addition, we sell an extensive line of mirror products, including our own private-label brand called Kool-Vue™, which are marketed and sold as aftermarket replacement parts and as upgrades to existing parts.

Engine/Hard Parts. The engine parts category is comprised of engine components and other mechanical and electrical parts, which are often referred to as hard parts. These parts serve as replacement parts for existing engine parts and are generally used by professionals and do-it-yourselfers for engine and mechanical maintenance and repair.

Performance Parts and Accessories. We offer performance versions of many parts sold in each of the above categories. Performance parts and accessories generally consist of parts that enhance the performance of the automobile, upgrade existing functionality of a specific part or improve the physical appearance or comfort of the automobile.

Our Sales Channels

Our sales channels include the online channel and the offline channel.

Online Sales Channel. Our online sales channel consists of our e-commerce channel, online marketplaces and online advertising. Our e-commerce channel includes a network of e-commerce websites, supported by our call-center sales agents. We also sell our products through online marketplaces, including third-party auction sites and shopping portals, which provide us with access to additional consumer segments. The majority of our online sales are to individual consumers. We sell online advertising and sponsorship positions on our e-commerce websites to highlight vendor brands and offer complementary products and services that benefit our customers. Advertising is targeted to specific sections of the websites and can also be targeted to specific users based on the vehicles they drive. Advertising partners primarily include part vendors, national automotive aftermarket brands, and automobile manufacturers.

Offline Sales Channel. We sell and deliver to collision repair shops from our Carson, California and Chesapeake, Virginia warehouse facilities. We also market our Kool-Vue™ products nationwide to auto parts wholesale distributors and serve consumers by operating a retail outlet store in LaSalle, Illinois.

Our Fulfillment Operations

We fulfill customer orders using two primary methods: (i) stock-and-ship, where we take physical delivery of merchandise and store it in one of our distribution centers until it is shipped to a customer, and (ii) drop-ship, where merchandise is shipped directly to customers from our suppliers. We believe that the flexibility of fulfilling orders using two different fulfillment methods allows us to offer a broader product selection, helps optimize product inventory and enhances our overall business profitability.

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The selection of fulfillment methodology occurs after an order submission. After a customer submits an order, our fulfillment system performs a check on the ordered item to determine if it is in stock at any of our distribution centers. Fulfillment teams in our distribution centers then process orders for in-stock products. Orders for non-stocked products are sent to our suppliers and processed via drop-ship.

Stock-and-Ship Fulfillment. Our stock-and-ship products are sourced primarily from manufacturers and other suppliers located in Asia and in the U.S. and are stored in one of our distribution centers in Carson, California; Chesapeake, Virginia; and LaSalle, Illinois. All products received into our distribution centers are entered into our inventory management systems, allowing us to closely monitor inventory availability. We consider a number of factors in determining which items to stock in our distribution centers, including which products can be purchased at a meaningful discount to domestic prices for similar items, which products have historically sold in high volumes, and which products may be out of stock when we attempt to fulfill via drop-ship.

Drop-Ship Fulfillment. We have developed relationships with several U.S.-based automobile parts distributors that operate their own distribution centers and will deliver products directly to our customers. We internally developed a proprietary distributor selection system, Auto-Vend™, which allows us to electronically select multiple vendors for a given order. Auto-Vend™ will attempt to first direct an order to one of our warehouses. If the product is not in stock, Auto-Vend™ will process the order to the next appropriate vendor based on customer location, cost, contractual agreements, and service level history.

Suppliers

We source our products from foreign manufacturers and importers located in Taiwan and China, and from U.S. manufacturers and distributors. We drop-ship orders for low demand products manufactured in the U.S. directly from our manufacturers and distributors. We generally place large-volume orders with these suppliers and, as a result, may receive volume discounts on certain ordered products. Our domestic suppliers offer direct-to-customer shipping, allowing us to save on fulfillment costs and offer a broader selection of products. We have developed application programming interfaces with several of these suppliers that allow us to electronically transmit orders and check inventory availability. We are a significant customer for many of our drop-ship vendors and have long standing relationships and contracts with many of these suppliers. For the fiscal year ended December 28, 2013, three of our drop-ship vendors provided 18% of our total product purchases.

Marketing

Our online marketing efforts are designed to attract visitors to our websites, convert visitors into purchasing customers and encourage repeat purchases among our existing customer base. We use a variety of marketing methods, including online marketing methods to attract visitors, which include paid search advertising, search engine optimization, affiliate programs, e-mail marketing, print catalogues and inclusion in online shopping engines. To convert visitors into paying customers, we periodically run in-site promotions for discounted purchases. We seek to create cross-selling opportunities by displaying complementary and related products available for sale throughout the purchasing process. We utilize several marketing techniques, including targeted e-mails about specific vehicle promotions, to increase customer awareness of our products.

International Operations

In April 2007, we established offshore operations in the Philippines. Our offshore operations allow us to access a workforce with the necessary technical skills at a significantly lower cost than comparably experienced U.S.-based professionals. Our offshore operations are responsible for a majority of our website development, catalog management, and back office support. Our offshore operations also house our main call center. We had 714 employees in the Philippines as of December 28, 2013. In addition to our operations in the Philippines, we have a Canadian subsidiary; the subsidiary currently has no operations or employees. We ship auto parts through a freight forwarding partner throughout the world. In 2013, we shipped auto parts to over 147 different countries.

Competition

The auto repair information and parts industry is competitive and highly fragmented, with products distributed through multi-tiered and overlapping channels. We compete with both online and offline retailers who offer original equipment manufacturer (“OEM”) and aftermarket parts to either the DIY or do-it-for-me (“DIFM”) customer segments. Current or potential competitors include the following:

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We believe the principal competitive factors in our market are helping customers easily find their parts, educating consumers on the service and maintenance of their vehicles, maintaining a proprietary product catalog that maps individual parts to relevant vehicle applications, broad product selection and availability, price, knowledgeable customer service, and rapid order fulfillment and delivery. We believe we compete favorably on the basis of these factors. However, some of our competitors may be larger, may have stronger brand recognition or may have access to greater financial, technical and marketing resources or have been operating longer than we have.

Government Regulation

We are subject to federal and state consumer protection laws, including laws protecting the privacy of customer non-public information and the handling of customer complaints and regulations prohibiting unfair and deceptive trade practices. The growth and demand for online commerce has and may continue to result in more stringent consumer protection laws that impose additional compliance burdens on online companies. These laws may cover issues such as user privacy, spyware and the tracking of consumer activities, marketing e-mails and communications, other advertising and promotional practices, money transfers, pricing, content and quality of products and services, taxation, electronic contracts and other communications and information security. In addition, most states have passed laws that prohibit or limit the use of aftermarket auto parts in collision repair work and/or require enhanced disclosure or vehicle owner consent before using aftermarket auto parts in such repair work and additional legislation of this kind may be introduced in the future.

There is also great uncertainty over whether or how existing laws governing issues such as property ownership, sales and other taxes, auctions, libel and personal privacy apply to the Internet and commercial online services. These issues may take years to resolve. For example, tax authorities in a number of states, as well as a Congressional advisory commission, are currently reviewing the appropriate tax treatment of companies engaged in online commerce, and new state tax regulations may subject us to additional state sales and income taxes. New legislation or regulation, the application of laws and regulations from jurisdictions whose laws do not currently apply to our business or the application of existing laws and regulations to the Internet and commercial online services could result in significant additional taxes or regulatory restrictions on our business. These taxes or restrictions could have an adverse effect on our cash flows and results of operations. Furthermore, there is a possibility that we may be subject to significant fines or other payments for any past failures to comply with these requirements.

Environmental

We are subject to environmental regulation as it affects certain of the products we sell. For instance, California currently only allows catalytic converters approved by the state to be sold within the state and, during 2010 and early 2011, the Company met with the California Air Resources Board (“CARB”) to discuss alleged sales of catalytic converters into California by the Company and third-party suppliers that are not compliant with California regulations. CARB informed the Company that penalties shall be assessed with regard to any non-compliant sales. On October 26, 2011, the Company and CARB entered into a settlement agreement related to this inquiry. Without admitting any liability, the Company agreed to pay a non-material cash penalty, subject to being offset by contributions from some of the Company’s third-party suppliers, in exchange for a release from CARB of the Company and such third-party suppliers. There has been an indication that other states may be pursuing the enactment of similar regulations. In addition, if we expanded our product lines, we may be subject to additional environmental regulation.

Seasonality

We believe our business is subject to seasonal fluctuations. We have historically experienced higher sales of body parts in winter months when inclement weather and hazardous road conditions typically result in more automobile collisions. Engine parts and performance parts and accessories have historically experienced higher sales in the summer months when consumers have more time to undertake elective projects to maintain and enhance the performance of their automobiles and the warmer weather during that time is conducive for such projects. We expect the historical seasonality trends to continue, and such trends may have a material impact on our financial condition and results of operations in subsequent periods.

Employees

As of December 28, 2013, we had 318 employees in the United States and 714 employees in the Philippines for a total of 1,032 employees. None of our employees are represented by a labor union, and we have never experienced a work stoppage.

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Available Information

Our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and amendments to those reports are available free of charge on the Investor Relations section of our corporate website located at www.usautoparts.net as soon as reasonably practicable after such reports are electronically filed with, or furnished to, the Securities and Exchange Commission (“SEC”). The inclusion of our website address in this report does not include or incorporate by reference into this report any information on our website.

Our business is subject to a number of risks which are discussed below. Other risks are presented elsewhere in this report and in our other filings with the SEC. You should consider carefully the following risks in addition to the other information contained in this report and our other filings with the SEC, including our subsequent reports on Forms 10-Q and 8-K, and any amendments thereto, before deciding to buy, sell or hold our common stock. If any of the following known or unknown risks or uncertainties actually occurs with material adverse effects on us, our business, financial condition, results of operations and/or liquidity could be seriously harmed. In that event, the market price for our common stock will likely decline and you may lose all or part of your investment.

Risks Related To Our Business

Purchasers of aftermarket auto parts may not choose to shop online, which would prevent us from acquiring new customers who are necessary to the growth of our business.

The online market for aftermarket auto parts is less developed than the online market for many other business and consumer products, and currently represents only a small part of the overall aftermarket auto parts market. Our success will depend in part on our ability to attract new customers and to convert customers who have historically purchased auto parts through traditional retail and wholesale operations. Specific factors that could discourage or prevent prospective customers from purchasing from us include:

If the online market for auto parts does not gain widespread acceptance, our sales may decline and our business and financial results may suffer.

We depend on search engines and other online sources to attract visitors to our websites, and if we are unable to attract these visitors and convert those into customers in a cost-effective manner, our business and results of operations will be harmed.

Our success depends on our ability to attract online consumers to our websites and convert them into customers in a cost-effective manner. We are significantly dependent upon search engines, shopping comparison sites and other online sources for our website traffic. We are included in search results as a result of both paid search listings, where we purchase specific search terms that will result in the inclusion of our listing, and algorithmic searches that depend upon the searchable content on our sites. We reduced our paid search listings in 2012 as well as in 2013, and are substantially dependent on algorithmic listings to attract online consumers to our websites.

Algorithmic listings cannot be purchased and instead are determined and displayed solely by a set of formulas utilized by the search engine. Search engines, shopping comparison sites and other online sources have in the past, and will continue to revise their algorithms from time to time in an attempt to optimize their search results. For example, search engines, like Google, revise their algorithms regularly in an attempt to optimize their search results. In fiscal years 2012 and 2013, we were negatively impacted by the changes in methodology for how Google displayed or selected our different websites for customer search results, which reduced our unique visitor count and adversely affected our financial results. We are continuing to address the challenges due to the changes in the methodology for customer search results that we experienced in 2012 and 2013; however no assurance can be made whether we will be successful in addressing these issues. If other

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search engines, shopping comparison sites or similar online sources on which we rely for website traffic were to modify their general methodology for how they display or select our websites in a manner similar to the changes made by Google, or if Google continues to make changes to Google’s search results ranking algorithms that cause those algorithms to interact with our platform in a manner that continues to reduce our unique visitors, even fewer consumers may click through to our websites, and our financial results could be further adversely affected.

Similarly, if any free search engine or shopping comparison site on which we rely begins charging fees for listing or placement, or if one or more of the search engines, shopping comparison sites and other online sources on which we rely for purchased listings, modifies or terminates its relationship with us, our expenses could rise, we could lose customers and traffic to our websites could decrease.

We continue the process of implementing several strategies to attempt to overcome these changes, which in 2013 included the consolidation and improvements to our websites to improve our ranking on the search results and pursuing opportunities in third-party online marketplaces, which may not be successful. If these strategies are not successful, our operating results and financial condition could be materially and adversely affected. Additionally, if search engines begin to limit our display results or eliminate our results from the algorithmic search, our website traffic could be further impacted and our business would be materially harmed.

In addition, our success in attracting visitors who convert to customers will depend in part upon our ability to identify and purchase relevant search terms, provide relevant content on our sites, and effectively target our other marketing programs such as e-mail campaigns and affiliate programs. If we are unable to attract visitors to our websites and convert them to customers in a cost-effective manner, then our sales may decline and our business and financial results may be harmed.

Shifting online consumer behavior for purchasers of aftermarket auto parts may shift from desktop based to mobile device based online shopping, which could impact the growth of our business and our financial results could suffer.

Mobile device based online shopping represents an increasing part of our business. Shifting consumer behavior indicates that our customers may become more inclined to purchase aftermarket auto parts through their mobile devices. Mobile customers exhibit different behaviors than our more traditional desktop based e-commerce customers. User sophistication and technological advances have increased consumer expectations around the user experience on mobile devices, including speed of response, functionality, product availability, security, and ease of use. If we are unable to continue to adapt our mobile device shopping experience from desktop based online shopping in ways that improve our customer’s mobile experience and increase the engagement of our mobile customers our sales may decline and our business and financial results may suffer.

During fiscal 2013 and 2012, we experienced a downward trend in our revenues and our net losses continued, and we expect a reduced downward trend in our revenues and net loss to continue into 2014.

During the fiscal year ended 2013, we incurred a net loss of $15.6 million and our revenues declined to $254.8 million compared to a net loss of $36.0 million and revenues of $304.0 million, respectively, for the fiscal year ended 2012. For fiscal year 2013 and 2012, we had experienced decreases of 16.2% and 7.0% in net sales, as compared to the same periods in 2012 and 2011, respectively. Overall, we expect a reduced downward trend in our revenues and net loss to continue into the first half of 2014, however, we started to observe a reduction in the negative trends of revenues and losses in the last quarter of 2013; we have been able to reduce our expenses, due to our cost reduction measures adopted in 2012 and 2013. Even with some stabilization in sight, if these negative trends continue, they could severely impact our liquidity, as we may not be able to provide positive cash flows from operations in order to meet our working capital requirements. We may need to borrow additional funds from our credit facility, which under certain circumstances may not be available, sell additional assets or seek additional equity or additional debt financing in the future. There can be no assurance that we would be able to raise such additional financing or engage in such asset sales on acceptable terms, or at all. If the downward trend in revenues and net loss continues for longer than we expect because our strategies to return to positive sales growth and profitability are not successful or otherwise, and if we are not able to raise adequate additional financing or proceeds from asset sales to continue to fund our ongoing operations, we will need to defer, reduce or eliminate significant planned expenditures, restructure or significantly curtail our operations, file for bankruptcy or cease operations.

Our operations are restricted by our credit facility, and our ability to borrow funds under our credit facility is subject to a borrowing base.

Our credit facility includes a number of restrictive covenants. These covenants could impair our financing and operational flexibility and make it difficult for us to react to market conditions and satisfy our ongoing capital needs and unanticipated cash requirements. Specifically, such covenants restrict our ability and, if applicable, the ability of our subsidiaries to, among other things:

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In addition, our credit facility is subject to a borrowing base derived from certain of our receivables, inventory, property and equipment. In the event that components of the borrowing base are adversely affected for any reason, including adverse market conditions or downturns in general economic conditions, we could be restricted in the amount of funds we can borrow under the credit facility. Furthermore, in the event that components of the borrowing base decrease to a level below the amount of loans then-outstanding under the credit facility, we could be required to immediately repay loans to the extent of such shortfall. If any of these events were to occur, it could severely impact our liquidity and capital resources, limit our ability to operate our business and could have a material adverse effect on our financial condition and results of operation.

Furthermore, under certain circumstances, our credit facility may require us to satisfy a financial covenant, which could limit our ability to react to market conditions or satisfy extraordinary capital needs and could otherwise impact our liquidity and capital resources, restrict our financing and have a material adverse effect on our results of operations.

Our ability to comply with the covenants and other terms of our debt obligations will depend on our future operating performance. If we fail to comply with such covenants and terms, we would be required to obtain waivers from our lenders to maintain compliance with our debt obligations. In the future, if we are unable to obtain any necessary waivers and the debt is accelerated, a material adverse effect on our financial condition and future operating performance would result. Additionally, our indebtedness could have important consequences, including the following:

Furthermore, our ability to satisfy our debt service obligations will depend, among other things, upon fluctuations in interest rates, our future operating performance and ability to refinance indebtedness when and if necessary. These factors depend partly on economic, financial, competitive and other factors beyond our control. We may not be able to generate sufficient cash from operations to meet our debt service obligations as well as fund necessary capital expenditures and general operating expenses. In addition, if we need to refinance our debt, or obtain additional debt financing or sell assets or equity to satisfy our debt service obligations, we may not be able to do so on commercially reasonable terms, if at all. If this were to occur, we may need to defer, reduce or eliminate significant planned expenditures, restructure or significantly curtail our operations, file for bankruptcy or cease operations.

We may not be able to successfully acquire new businesses or integrate acquisitions, which could cause our business to suffer.

We may not be able to successfully complete potential strategic acquisitions if we cannot reach agreement on acceptable terms, restrictions under our credit facility or for other reasons. If we acquire a company or a division of a company, we may experience difficulty integrating that company’s or division’s personnel and operations, which could negatively affect our operating results. In addition:

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We acquired WAG on August 12, 2010 and in conjunction with the acquisition we recorded a significant valuation allowance against our deferred tax asset, and have incurred greater than usual legal and accounting fees, as well as general and administrative expenses. During the fiscal year ended December 31, 2011, we incurred acquisition and integration related costs of $7.4 million related to the WAG acquisition. During the fourth quarter of 2012, we recorded an impairment charge on goodwill of $18.9 million. During the fourth quarter of 2012 and 2011, we recorded an impairment charge on certain intangible assets related to the WAG acquisition totaling $3.8 million and $5.1 million, respectively. Additionally, because the acquisition of WAG was a stock purchase, we may incur liability for acts taken prior to our acquisition that may involve costly litigation. Integrating any newly acquired businesses’ websites, technologies or services is likely to be expensive and time consuming. For example, our acquisition of All OEM Parts, Inc., Partsbin.com, Inc., and other affiliated companies (collectively “Partsbin”), resulted in significant costs, including a material impairment charge, a write-down of goodwill associated with the acquisition, and a number of challenges, including retaining employees of the acquired company, integrating our order processing and credit processing, integrating our product pricing strategy, and integrating the diverse technologies and differing e-commerce platforms and accounting systems used by each company. Our integration activities in connection with our acquisitions have also caused a substantial diversion of our management’s attention. If we are unable to successfully complete the integration of acquisitions, we may not realize the anticipated synergies from such acquisitions, we may take further impairment charges and write-downs associated with such acquisitions, and our business and results of operations could suffer. We may selectively pursue additional acquisitions of businesses, technologies or services in order to expand our capabilities, enter new markets or increase our market share.

If our assets become impaired we may be required to record a significant charge to earnings.

We review our long-lived assets for impairment when events or changes in circumstances indicate the carrying value may not be recoverable. Factors that may be considered are changes in circumstances indicating that the carrying value of our assets may not be recoverable include a decrease in future cash flows. We may be required to record a significant charge to earnings in our financial statements during the period in which any impairment of our assets is determined, resulting in an impact on our results of operations. For example, during the second quarter of 2013, we recorded an impairment charge on property and equipment of $4.8 million and on intangible assets of $1.3 million, respectively. During the fourth quarter of 2012, we recorded an impairment charge on goodwill of $18.9 million and on intangible assets of $5.6 million. During the fourth quarter of 2011, we incurred an impairment charge on intangible assets of $5.1 million.

If we are unable to manage the challenges associated with our international operations, the growth of our business could be limited and our business could suffer.

We maintain international business operations in the Philippines. This international operation includes development and maintenance of our websites, our main call center, and sales and back office support services. We also have a Canadian subsidiary, which we can operate to facilitate sales in Canada. We are subject to a number of risks and challenges that specifically relate to our international operations. Our international operations may not be successful if we are unable to meet and overcome these challenges, which could limit the growth of our business and may have an adverse effect on our business and operating results. These risks and challenges include:

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We are dependent upon relationships with suppliers in Taiwan, China and the United States for the vast majority of our products.

We acquire substantially all of our products from manufacturers and distributors located in Taiwan, China and the United States. Our top ten suppliers represented 43% of our total product purchases during the fifty-two weeks ended December 28, 2013. We do not have any long-term contracts or exclusive agreements with our foreign suppliers that would ensure our ability to acquire the types and quantities of products we desire at acceptable prices and in a timely manner. In addition, our ability to acquire products from our suppliers in amounts and on terms acceptable to us is dependent upon a number of factors that could affect our suppliers and which are beyond our control. For example, financial or operational difficulties that some of our suppliers may face could result in an increase in the cost of the products we purchase from them. In addition, the increasing consolidation among auto parts suppliers may disrupt or end our relationship with some suppliers, result in product shortages and/or lead to less competition and, consequently, higher prices. Furthermore, as part of our routine business, suppliers extend credit to us in connection with our purchase of their products. In the future, our suppliers may limit the amount of credit they are willing to extend to us in connection with our purchase of their products, if any. If this were to occur, it could impair our ability to acquire the types and quantities of products that we desire from the applicable suppliers on acceptable terms, severely impact our liquidity and capital resources, limit our ability to operate our business and could have a material adverse effect on our financial condition and results of operation.

In addition, because many of our suppliers are outside of the United States, additional factors could interrupt our relationships or affect our ability to acquire the necessary products on acceptable terms, including:

Additionally, if we do not maintain our relationships with our existing suppliers or develop relationships with new suppliers on acceptable commercial terms, we may not be able to continue to offer a broad selection of merchandise at competitive prices and, as a result, we could lose customers and our sales could decline.

We are dependent upon third parties for distribution and fulfillment operations with respect to many of our products.

For a number of the products that we sell, we outsource the distribution and fulfillment operation and are dependent on our distributors to manage inventory, process orders and distribute those products to our customers in a timely manner. For the fifty-two weeks ended December 28, 2013, our product purchases from three drop-ship suppliers represented 18% of our

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total product purchases. If we do not maintain our existing relationships with these suppliers and our other distributors on acceptable commercial terms, we will need to obtain other suppliers and may not be able to continue to offer a broad selection of merchandise at competitive prices, and our sales may decrease.

In addition, because we outsource to distributors a number of these traditional retail functions relating to those products, we have limited control over how and when orders are fulfilled. We also have limited control over the products that our distributors purchase or keep in stock. Our distributors may not accurately forecast the products that will be in high demand or they may allocate popular products to other resellers, resulting in the unavailability of certain products for delivery to our customers. Any inability to offer a broad array of products at competitive prices and any failure to deliver those products to our customers in a timely and accurate manner may damage our reputation and brand and could cause us to lose customers.

We depend on third-party delivery services to deliver our products to our customers on a timely and consistent basis, and any deterioration in our relationship with any one of these third parties or increases in the fees that they charge could harm our reputation and adversely affect our business and financial condition.

We rely on third parties for the shipment of our products and we cannot be sure that these relationships will continue on terms favorable to us, or at all. Shipping costs have increased from time to time, and may continue to increase, which could harm our business, prospects, financial condition and results of operations by increasing our costs of doing business and resulting in reduced gross margins. In addition, if our relationships with these third parties are terminated or impaired, or if these third parties are unable to deliver products for us, whether due to labor shortage, slow down or stoppage, deteriorating financial or business condition, responses to terrorist attacks or for any other reason, we would be required to use alternative carriers for the shipment of products to our customers. Changing carriers could have a negative effect on our business and operating results due to reduced visibility of order status and package tracking and delays in order processing and product delivery, and we may be unable to engage alternative carriers on a timely basis, upon terms favorable to us, or at all.

If commodity prices such as fuel, plastic and steel increase, our margins may reduce.

Our third party delivery services have increased fuel surcharges from time to time, and such increases negatively impact our margins, as we are generally unable to pass all of these costs directly to consumers. Increasing prices in the component materials for the parts we sell may impact the availability, the quality and the price of our products, as suppliers search for alternatives to existing materials and as they increase the prices they charge. We cannot ensure that we can recover all the increased costs through price increases, and our suppliers may not continue to provide the consistent quality of product as they may substitute lower cost materials to maintain pricing levels, all of which may have a negative impact on our business and results of operations.

If our fulfillment operations are interrupted for any significant period of time or are not sufficient to accommodate increased demand, our sales would decline and our reputation could be harmed.

Our success depends on our ability to successfully receive and fulfill orders and to promptly deliver our products to our customers. The majority of orders for our auto body parts products are filled from our inventory in our distribution centers, where all our inventory management, packaging, labeling and product return processes are performed. Increased demand and other considerations may require us to expand our distribution centers or transfer our fulfillment operations to larger facilities in the future.

Our distribution centers are susceptible to damage or interruption from human error, fire, flood, power loss, telecommunications failures, terrorist attacks, acts of war, break-ins, earthquakes and similar events. We do not currently maintain back-up power systems at our fulfillment centers. We do not presently have a formal disaster recovery plan and our business interruption insurance may be insufficient to compensate us for losses that may occur in the event operations at our fulfillment center are interrupted. Any interruptions in our fulfillment operations for any significant period of time, including interruptions resulting from the expansion of our existing facilities or the transfer of operations to a new facility, could damage our reputation and brand and substantially harm our business and results of operations and alternate arrangements may increase the cost of fulfillment. In addition, if we do not successfully expand our fulfillment capabilities in response to increases in demand, we may not be able to substantially increase our net sales.

We rely on bandwidth and data center providers and other third parties to provide products to our customers, and any failure or interruption in the services provided by these third parties could disrupt our business and cause us to lose customers.

We rely on third-party vendors, including data center and bandwidth providers. Any disruption in the network access or co-location services, which are the services that house and provide Internet access to our servers, provided by these third-party providers or any failure of these third-party providers to handle current or higher volumes of use could significantly harm our business. Any financial or other difficulties our providers face may have negative effects on our business, the nature

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and extent of which we cannot predict. We exercise little control over these third-party vendors, which increases our vulnerability to problems with the services they provide. We also license technology and related databases from third parties to facilitate elements of our e-commerce platform. We have experienced and expect to continue to experience interruptions and delays in service and availability for these elements. Any errors, failures, interruptions or delays experienced in connection with these third-party technologies could negatively impact our relationship with our customers and adversely affect our business. Our systems also heavily depend on the availability of electricity, which also comes from third-party providers. If we were to experience a major power outage, we would have to rely on back-up generators. These back-up generators may not operate properly through a major power outage, and their fuel supply could also be inadequate during a major power outage. Information systems such as ours may be disrupted by even brief power outages, or by the fluctuations in power resulting from switches to and from backup generators. This could disrupt our business and cause us to lose customers.

We face intense competition and operate in an industry with limited barriers to entry, and some of our competitors may have greater resources than us and may be better positioned to capitalize on the growing e-commerce auto parts market.

The auto parts industry is competitive and highly fragmented, with products distributed through multi-tiered and overlapping channels. We compete with both online and offline retailers who offer original equipment manufacturer (“OEM”) and aftermarket auto parts to either the DIY or do-it-for-me customer segments. Current or potential competitors include the following:

Barriers to entry are low, and current and new competitors can launch websites at a relatively low cost. Many of our current and potential competitors have longer operating histories, larger customer bases, greater brand recognition and significantly greater financial, marketing, technical, management and other resources than we do. For example, in the event that online marketplace companies such as Amazon or eBay, who have larger customer bases, greater brand recognition and significantly greater resources than we do, focus more of their resources on competing in the aftermarket auto parts market, it could have a material adverse effect on our business and results of operations. In addition, some of our competitors have used and may continue to use aggressive pricing tactics and devote substantially more financial resources to website and system development than we do. We expect that competition will further intensify in the future as Internet use and online commerce continue to grow worldwide. Increased competition may result in reduced sales, lower operating margins, reduced profitability, loss of market share and diminished brand recognition.

Additionally, we have experienced significant competitive pressure from our suppliers who are now selling their products directly to customers. Since our suppliers have access to merchandise at very low costs, they can sell products at lower prices and maintain higher gross margins on their product sales than we can. Our financial results have been negatively impacted by direct sales from our suppliers to our current and potential customers, and our total number of orders and average order value may continue to decline due to increased competition. Continued competition from suppliers of ours that are capable of maintaining high sales volumes and acquiring products at lower prices than us will continue to negatively impact our business and results of operations, including through reduced sales, lower operating margins, reduced profitability, loss of market share and diminished brand recognition. We are in the process of implementing several strategies to attempt to overcome the challenges created by our suppliers selling directly to our customers and potential customers, including by lowering our prices by increasing foreign sourced products and by improvements in our websites, which may not be successful. If these strategies are not successful, our operating results and financial conditions could be materially and adversely affected.

If we fail to offer a broad selection of products at competitive prices to meet our customers’ demands, our revenue could decline.

In order to expand our business, we must successfully offer, on a continuous basis, a broad selection of auto parts that meet the needs of our customers, including by being the first to market with new SKUs. Our auto parts are used by consumers for a variety of purposes, including repair, performance, improved aesthetics and functionality. In addition, to be successful, our product offerings must be broad and deep in scope, competitively priced, well-made, innovative and attractive to a wide range of consumers. We cannot predict with certainty that we will be successful in offering products that meet all of these requirements. If our product offerings fail to satisfy our customers’ requirements or respond to changes in customer preferences, our revenue could decline.

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Challenges by OEMs to the validity of the aftermarket auto parts industry and claims of intellectual property infringement could adversely affect our business and the viability of the aftermarket auto parts industry.

OEMs have attempted to use claims of intellectual property infringement against manufacturers and distributors of aftermarket products to restrict or eliminate the sale of aftermarket products that are the subject of the claims. The OEMs have brought such claims in federal court and with the United States International Trade Commission. We have received in the past, and we anticipate we may in the future receive, communications alleging that certain products we sell infringe the patents, copyrights, trademarks and trade names or other intellectual property rights of OEMs or other third parties. For instance, after approximately three and a half years of litigation and related costs and expenses, on April 16, 2009, we entered into a settlement agreement with Ford Motor Company and Ford Global Technologies, LLC that ended the two legal actions that were initiated by Ford against us related to claims of intellectual property infringement. The United States Patent and Trademark Office records indicate that OEMs are seeking and obtaining more design patents then they have in the past. To the extent that the OEMs are successful with intellectual property infringement claims, we could be restricted or prohibited from selling certain aftermarket products which could have an adverse effect on our business. Infringement claims could also result in increased costs of doing business arising from increased legal expenses, adverse judgments or settlements or changes to our business practices required to settle such claims or satisfy any judgments. Litigation could result in interpretations of the law that require us to change our business practices or otherwise increase our costs and harm our business. We do not maintain insurance coverage to cover the types of claims that could be asserted. If a successful claim were brought against us, it could expose us to significant liability.

If we are unable to protect our intellectual property rights, our reputation and brand could be impaired and we could lose customers.

We regard our trademarks, trade secrets and similar intellectual property such as our proprietary back-end order processing and fulfillment code and process as important to our success. We rely on trademark and copyright law, and trade secret protection, and confidentiality and/or license agreements with employees, customers, partners and others to protect our proprietary rights. We cannot be certain that we have taken adequate steps to protect our proprietary rights, especially in countries where the laws may not protect our rights as fully as in the United States. In addition, our proprietary rights may be infringed or misappropriated, and we could be required to incur significant expenses to preserve them. In the past we have filed litigation to protect our intellectual property rights. The outcome of such litigation can be uncertain, and the cost of prosecuting such litigation may have an adverse impact on our earnings. We have common law trademarks, as well as pending federal trademark registrations for several marks and several registered marks. Even if we obtain approval of such pending registrations, the resulting registrations may not adequately cover our intellectual property or protect us against infringement by others. Effective trademark, service mark, copyright, patent and trade secret protection may not be available in every country in which our products and services may be made available online. We also currently own or control a number of Internet domain names, including www.usautoparts.net, www.autopartswarehouse.com, www.jcwhitney.com and www.AutoMD.com, and have invested time and money in the purchase of domain names and other intellectual property, which may be impaired if we cannot protect such intellectual property. We may be unable to protect these domain names or acquire or maintain relevant domain names in the United States and in other countries. If we are not able to protect our trademarks, domain names or other intellectual property, we may experience difficulties in achieving and maintaining brand recognition and customer loyalty.

If our product catalog database is stolen, misappropriated or damaged, or if a competitor is able to create a substantially similar catalog without infringing our rights, then we may lose an important competitive advantage.

We have invested significant resources and time to build and maintain our product catalog, which is maintained in the form of an electronic database, which maps SKUs to relevant product applications based on vehicle makes, models and years. We believe that our product catalog provides us with an important competitive advantage in both driving traffic to our websites and converting that traffic to revenue by enabling customers to quickly locate the products they require. We cannot assure you that we will be able to protect our product catalog from unauthorized copying or theft or that our product catalog will continue to operate adequately, without any technological challenges. In addition, it is possible that a competitor could develop a catalog or database that is similar to or more comprehensive than ours, without infringing our rights. In the event our product catalog is damaged or is stolen, copied or otherwise replicated to compete with us, whether lawfully or not, we may lose an important competitive advantage and our business could be harmed.

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Our e-commerce system is dependent on open-source software, which exposes us to uncertainty and potential liability.

We utilize open-source software such as Linux, Apache, MySQL, PHP, Fedora and Perl throughout our web properties and supporting infrastructure although we have created proprietary programs. Open-source software is maintained and upgraded by a general community of software developers under various open-source licenses, including the GNU General Public License (“GPL”). These developers are under no obligation to maintain, enhance or provide any fixes or updates to this software in the future. Additionally, under the terms of the GPL and other open-source licenses, we may be forced to release to the public source-code internally developed by us pursuant to such licenses. Furthermore, if any of these developers contribute any code of others to any of the software that we use, we may be exposed to claims and liability for intellectual property infringement. A number of lawsuits are currently pending against third parties over the ownership rights to the various components within some open-source software that we use. If the outcome of these lawsuits is unfavorable, we may be held liable for intellectual property infringement based on our use of these open-source software components. We may also be forced to implement changes to the code-base for this software or replace this software with internally developed or commercially licensed software.

We face exposure to product liability lawsuits.

The automotive industry in general has been subject to a large number of product liability claims due to the nature of personal injuries that result from car accidents or malfunctions. As a distributor of auto parts, including parts obtained overseas, we could be held liable for the injury or damage caused if the products we sell are defective or malfunction. While we carry insurance against product liability claims, if the damages in any given action were high or we were subject to multiple lawsuits, the damages and costs could exceed the limits of our insurance coverage. If we were required to pay substantial damages as a result of these lawsuits, it may seriously harm our business and financial condition. Even defending against unsuccessful claims could cause us to incur significant expenses and result in a diversion of management’s attention. In addition, even if the money damages themselves did not cause substantial harm to our business, the damage to our reputation and the brands offered on our websites could adversely affect our future reputation and our brand, and could result in a decline in our net sales and profitability.

We rely on key personnel and may need additional personnel for the success and growth of our business.

Our business is largely dependent on the personal efforts and abilities of highly skilled executive, technical, managerial, merchandising, marketing, and call center personnel. Competition for such personnel is intense, and we cannot assure that we will be successful in attracting and retaining such personnel. The loss of any key employee or our inability to attract or retain other qualified employees could harm our business and results of operations.

System failures, including failures due to natural disasters or other catastrophic events, could prevent access to our websites, which could reduce our net sales and harm our reputation.

Our sales would decline and we could lose existing or potential customers if they are not able to access our websites or if our websites, transactions processing systems or network infrastructure do not perform to our customers’ satisfaction. Any Internet network interruptions or problems with our websites could:

We have experienced brief computer system interruptions in the past, and we believe they may continue to occur from time to time in the future. Our systems and operations are also vulnerable to damage or interruption from a number of sources, including a natural disaster or other catastrophic event such as an earthquake, typhoon, volcanic eruption, fire, flood, terrorist attack, computer viruses, power loss, telecommunications failure, physical and electronic break-ins and other similar events. For example, our headquarters and the majority of our infrastructure, including some of our servers, are located in Southern California, a seismically active region. We also maintain offshore and outsourced operations in the Philippines, an area that has been subjected to a typhoon and a volcanic eruption in the past. In addition, California has in the past experienced power outages as a result of limited electrical power supplies and due to recent fires in the southern part of the state. Such outages, natural disasters and similar events may recur in the future and could disrupt the operation of our business. Our technology infrastructure is also vulnerable to computer viruses, physical or electronic break-ins and similar disruptions. Although the critical portions of our systems are redundant and backup copies are maintained offsite, not all of our systems and data are fully redundant. We do not presently have a formal disaster recovery plan in effect and may not

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have sufficient insurance for losses that may occur from natural disasters or catastrophic events. Any substantial disruption of our technology infrastructure could cause interruptions or delays in our business and loss of data or render us unable to accept and fulfill customer orders or operate our websites in a timely manner, or at all.

Risks Related To Our Capital Stock

Our common stock price has been and may continue to be volatile, which may result in losses to our stockholders.

The market prices of technology and e-commerce companies generally have been extremely volatile and have recently experienced sharp share price and trading volume changes. The trading price of our common stock is likely to be volatile and could fluctuate widely in response to, among other things, the risk factors described in this report and other factors beyond our control such as fluctuations in the operations or valuations of companies perceived by investors to be comparable to us, our ability to meet analysts’ expectations, or conditions or trends in the Internet or auto parts industries.

Since the completion of our initial public offering in February 2007 through December 28, 2013, the trading price of our common stock has been volatile, ranging from a high of $12.61 per share to a low per share of $0.91. We have also experienced significant fluctuations in the trading volume of our common stock. General economic and political conditions unrelated to our performance may also adversely affect the price of our common stock. In the past, following periods of volatility in the market price of a public company’s securities, securities class action litigation has often been initiated. Due to the inherent uncertainties of litigation, we cannot predict the ultimate outcome of any such litigation if it were initiated. The initiation of any such litigation or an unfavorable result could have a material adverse effect on our financial condition and results of operation.

Our common stock may be delisted from the Nasdaq Global Market (“Nasdaq”) if we are unable to maintain compliance with Nasdaq’s continued listing standards.

As a company traded on the Nasdaq, we are subject to compliance with Nasdaq’s listing rules, which require, among other things, that our Board of Directors be comprised of a majority of independent directors. In July 2013, we received a notice from Nasdaq that the Company’s Board of Directors was no longer comprised of a majority of independent directors due to the resignation of one of our independent directors. We regained compliance in November 2013 with the appointment of two new independent directors, prior to the expiration of the cure period provided by Nasdaq,

Nasdaq imposes, among other requirements, continued listing standards including minimum bid and public float requirements. The price of our common stock must trade at or above $1.00 to comply with Nasdaq’s minimum bid requirement for continued listing on the Nasdaq. If our stock trades at bid prices of less than $1.00 for a period in excess of 30 consecutive business days, the Nasdaq could send a deficiency notice to us for not remaining in compliance with the minimum bid listing standards. At certain times during the third quarter of 2013, our common stock traded below $1.00 per share at closing before it returned to trading at or above $1.00 to comply with Nasdaq’s minimum bid requirement for continued listing on the Nasdaq, however, at no time did such period exceed 30 consecutive business days. If the closing bid price of our common stock fails to meet Nasdaq’s minimum closing bid price requirement, or if we otherwise fail to meet any other applicable requirements of the Nasdaq and we are unable to regain compliance, Nasdaq may make a determination to delist our common stock.

Any delisting of our common stock could adversely affect the market liquidity of our common stock and the market price of our common stock could decrease. Furthermore, if our common stock were delisted it could adversely affect our ability to obtain financing for the continuation of our operations and/or result in the loss of confidence by investors, customers, suppliers and employees.

Our executive officers and directors and certain related parties own a significant percentage of our stock.

As of December 28, 2013, our executive officers and directors and certain related parties and entities that are affiliated with them beneficially owned in the aggregate approximately 51.8% of our outstanding shares of stock. This significant concentration of share ownership may adversely affect the trading price for our common stock because investors often perceive disadvantages in owning stock in companies with controlling stockholders. Also, these stockholders, acting together, will be able to significantly influence our management and affairs and control matters requiring stockholder approval including the election of our entire Board of Directors and certain significant corporate actions such as mergers, consolidations or the sale of substantially all of our assets. As a result, this concentration of ownership could delay, defer or prevent others from initiating a potential merger, takeover or other change in our control, even if these actions would benefit our other stockholders and us.

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The rights, preferences and privileges of our existing preferred stock may restrict our financial and operational flexibility.

In March 2013, our Board of Directors, under the authority granted by our Certificate of Incorporation, established a series of preferred stock, our Series A Convertible Preferred, which has various rights, preferences and privileges senior to the shares of our common stock. Dividends on the Series A Convertible Preferred are payable quarterly, subject to the satisfaction of certain conditions, at a rate of $0.058 per share per annum in cash, in shares of common stock or in any combination of cash and common stock as determined by our Board of Directors. While we may, at our election, subject to the satisfaction of certain conditions, pay any accrued but unpaid dividends on the Series A Convertible Preferred in either cash or in common stock, we may be unable to satisfy the requisite conditions for paying dividends in common stock and, under such circumstances, we will be required to pay such accrued but unpaid dividends in cash. In such circumstances, we will be required to use cash that would otherwise be used to fund our ongoing operations to pay such accrued but unpaid dividends. To the extent we do pay dividends in common stock, the ownership percentage of our common stockholders who are not holders of the Series A Convertible Preferred will be diluted. Our Series A Convertible Preferred is initially convertible for 4,149,997 shares of common stock, and to the extent that the Series A Convertible Preferred is converted, the common stock ownership percentage of our common stockholders who are not converting holders of the Series A Convertible Preferred will be diluted.

Our future operating results may fluctuate and may fail to meet market expectations.

We expect that our revenue and operating results will continue to fluctuate from quarter to quarter due to various factors, many of which are beyond our control. If our quarterly revenue or operating results fall below the expectations of investors or securities analysts, the price of our common stock could significantly decline. The factors that could cause our operating results to continue to fluctuate include, but are not limited to:

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If we fail to maintain an effective system of internal control over financial reporting or comply with Section 404 of the Sarbanes-Oxley Act of 2002, we may not be able to accurately report our financial results or prevent fraud, and our stock price could decline.

While management has concluded that our internal controls over financial reporting were effective as of December 28, 2013, we have in the past, and could in the future, have a significant deficiency or material weakness in internal control over financial reporting or fail to comply with Section 404 of the Sarbanes-Oxley Act of 2002. If we fail to properly maintain an effective system of internal control over financial reporting, it could impact our ability to prevent fraud or to issue our financial statements in a timely manner that presents fairly our financial condition and results of operations. The existence of any such deficiencies or weaknesses, even if cured, may also lead to the loss of investor confidence in the reliability of our financial statements, could harm our business and negatively impact the trading price of our common stock. Such deficiencies or material weaknesses may also subject us to lawsuits, investigations and other penalties.

Our charter documents could deter a takeover effort, which could inhibit your ability to receive an acquisition premium for your shares.

Provisions in our certificate of incorporation and bylaws could make it more difficult for a third party to acquire us, even if doing so would be beneficial to our stockholders. Such provisions include the following:

We do not intend to pay dividends on our common stock.

We currently do not expect to pay any cash dividends on our common stock for the foreseeable future.

General Market and Industry Risk

Economic conditions have had, and may continue to have an adverse effect on the demand for aftermarket auto parts and could adversely affect our sales and operating results.

We sell aftermarket auto parts consisting of body and engine parts used for repair and maintenance, performance parts used to enhance performance or improve aesthetics and accessories that increase functionality or enhance a vehicle’s features. Demand for our products has been and may continue to be adversely affected by general economic conditions. In declining economies, consumers often defer regular vehicle maintenance and may forego purchases of nonessential performance and accessories products, which can result in a decrease in demand for auto parts in general. Consumers also defer purchases of new vehicles, which immediately impacts performance parts and accessories, which are generally purchased in the first six months of a vehicle’s lifespan. In addition, during economic downturns some competitors may become more aggressive in their pricing practices, which would adversely impact our gross margin and could cause large fluctuations in our stock price. Certain suppliers may exit the industry which may impact our ability to procure parts and may adversely impact gross margin as the remaining suppliers increase prices to take advantage of limited competition.

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Vehicle miles driven, vehicle accident rates and insurance companies’ willingness to accept a variety of types of replacement parts in the repair process have fluctuated and may decrease, which could result in a decline of our revenues and negatively affect our results of operations.

We and our industry depend on the number of vehicle miles driven, vehicle accident rates and insurance companies’ willingness to accept a variety of types of replacement parts in the repair process. Decreased miles driven, caused in part by higher gas prices, reduce the number of accidents and corresponding demand for crash parts, and reduce the wear and tear on vehicles with a corresponding reduction in demand for vehicle repairs and replacement or hard parts. If consumers continue to drive less in the future, as a result of higher gas prices or otherwise, our sales may decline and our business and financial results may suffer.

The success of our business depends on the continued growth of the Internet as a retail marketplace and the related expansion of the Internet infrastructure.

Our future success depends upon the continued and widespread acceptance and adoption of the Internet as a vehicle to purchase products. If customers or manufacturers are unwilling to use the Internet to conduct business and exchange information, our business will fail. The commercial acceptance and use of the Internet may not continue to develop at historical rates, or may not develop as quickly as we expect. The growth of the Internet, and in turn the growth of our business, may be inhibited by concerns over privacy and security, including concerns regarding “viruses” and “worms,” reliability issues arising from outages or damage to Internet infrastructure, delays in development or adoption of new standards and protocols to handle the demands of increased Internet activity, decreased accessibility, increased government regulation, and taxation of Internet activity. In addition, our business growth may be adversely affected if the Internet infrastructure does not keep pace with the growing Internet activity and is unable to support the demands placed upon it, or if there is any delay in the development of enabling technologies and performance improvements.

We may be subject to liability for sales and other taxes and penalties, which could have an adverse effect on our business.

In 2013, we collected sales or other similar taxes only on the shipment of goods to the states of California, Kansas, Virginia, Illinois and Ohio. The U.S. Supreme Court has ruled that vendors whose only connection with customers in a state is by common carrier or the U.S. mail are free from state-imposed duties to collect sales and use taxes in that state. However, states could seek to impose additional income tax obligations or sales tax collection obligations on out-of-state companies such as ours, which engage in or facilitate online commerce, based on their interpretation of existing laws, including the Supreme Court ruling, or specific facts relating to us. If sales tax obligations are successfully imposed upon us by a state or other jurisdiction, we could be exposed to substantial tax liabilities for past sales and penalties and fines for failure to collect sales taxes. We could also suffer decreased sales in that state or jurisdiction as the effective cost of purchasing goods from us increases for those residing in that state or jurisdiction.

In addition, a number of states, as well as the U.S. Congress, have been considering various initiatives that could limit or supersede the Supreme Court’s apparent position regarding sales and use taxes on Internet sales. If any of these initiatives are enacted, we could be required to collect sales and use taxes in additional states and our revenue could be adversely affected. Furthermore, the U.S. Congress has not yet extended a moratorium, which was first imposed in 1998 but has since expired, on state and local governments’ ability to impose new taxes on Internet access and Internet transactions. The imposition by state and local governments of various taxes upon Internet commerce could create administrative burdens for us as well as substantially impair the growth of e-commerce and adversely affect our revenue and profitability. Since our service is available over the Internet in multiple states, these jurisdictions may require us to qualify to do business in these states. If we fail to qualify in a jurisdiction that requires us to do so, we could face liabilities for taxes and penalties.

Security threats to our IT infrastructure could expose us to liability, and damage our reputation and business

It is essential to our business strategy that our technology and network infrastructure remain secure and is perceived by our customers to be secure. Despite security measures, however, any network infrastructure may be vulnerable to cyber-attacks by hackers and other security threats. As a leading online source for automotive aftermarket parts and repair information, we may face cyber-attacks that attempt to penetrate our network security, including our data centers, to sabotage or otherwise disable our network of websites and online marketplaces, misappropriate our or our customers’ proprietary information, which may include personally identifiable information, or cause interruptions of our internal systems and services. If successful, any of these attacks could negatively affect our reputation, damage our network infrastructure and our ability to sell our products, harm our relationship with customers that are affected and expose us to financial liability.

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If we do not respond to technological change, our websites could become obsolete and our financial results and conditions could be adversely affected.

We maintain a network of websites which requires substantial development and maintenance efforts, and entails significant technical and business risks. To remain competitive, we must continue to enhance and improve the responsiveness, functionality and features of our websites. The Internet and the e-commerce industry are characterized by rapid technological change, the emergence of new industry standards and practices and changes in customer requirements and preferences. Therefore, we may be required to license emerging technologies, enhance our existing websites, develop new services and technology that address the increasingly sophisticated and varied needs of our current and prospective customers, and adapt to technological advances and emerging industry and regulatory standards and practices in a cost-effective and timely manner. Our ability to remain technologically competitive may require substantial expenditures and lead time and our failure to do so may harm our business and results of operations.

Existing or future government regulation could expose us to liabilities and costly changes in our business operations and could reduce customer demand for our products and services.

We are subject to federal and state consumer protection laws and regulations, including laws protecting the privacy of customer non-public information and regulations prohibiting unfair and deceptive trade practices, as well as laws and regulations governing businesses in general and the Internet and e-commerce and certain environmental laws. Additional laws and regulations may be adopted with respect to the Internet, the effect of which on e-commerce is uncertain. These laws may cover issues such as user privacy, spyware and the tracking of consumer activities, marketing e-mails and communications, other advertising and promotional practices, money transfers, pricing, content and quality of products and services, taxation, electronic contracts and other communications, intellectual property rights, and information security. Furthermore, it is not clear how existing laws such as those governing issues such as property ownership, sales and other taxes, trespass, data mining and collection, and personal privacy apply to the Internet and e-commerce. To the extent we expand into international markets, we will be faced with complying with local laws and regulations, some of which may be materially different than U.S. laws and regulations. Any such foreign law or regulation, any new U.S. law or regulation, or the interpretation or application of existing laws and regulations to the Internet or other online services or our business in general, may have a material adverse effect on our business, prospects, financial condition and results of operations by, among other things, impeding the growth of the Internet, subjecting us to fines, penalties, damages or other liabilities, requiring costly changes in our business operations and practices, and reducing customer demand for our products and services. We do not maintain insurance coverage to cover the types of claims or liabilities that could arise as a result of such regulation.

We may be affected by global climate change or by legal, regulatory, or market responses to such change.

The growing political and scientific sentiment is that global weather patterns are being influenced by increased levels of greenhouse gases in the earth’s atmosphere. This growing sentiment and the concern over climate change have led to legislative and regulatory initiatives aimed at reducing greenhouse gas emissions. For example, proposals that would impose mandatory requirements on greenhouse gas emissions continue to be considered by policy makers in the United States. Laws enacted that directly or indirectly affect our suppliers (through an increase in the cost of production or their ability to produce satisfactory products) or our business (through an impact on our inventory availability, cost of sales, operations or demand for the products we sell) could adversely affect our business, financial condition, results of operations and cash flows. Significant increases in fuel economy requirements or new federal or state restrictions on emissions of carbon dioxide that may be imposed on vehicles and automobile fuels could adversely affect demand for vehicles, annual miles driven or the products we sell or lead to changes in automotive technology. Compliance with any new or more stringent laws or regulations, or stricter interpretations of existing laws, could require additional expenditures by us or our suppliers. Our inability to respond to changes in automotive technology could adversely impact the demand for our products and our business, financial condition, results of operations or cash flows.

The United States government may substantially increase border controls and impose restrictions on cross-border commerce that may substantially harm our business.

We purchase a substantial portion of our products from foreign manufacturers and other suppliers who source products internationally. Restrictions on shipping goods into the United States from other countries pose a substantial risk to our business. Particularly since the terrorist attacks on September 11, 2001, the United States government has substantially increased border surveillance and controls. If the United States were to impose further border controls and restrictions, impose quotas, tariffs or import duties, increase the documentation requirements applicable to cross border shipments or take other actions that have the effect of restricting the flow of goods from other countries to the United States, we may have greater difficulty acquiring our inventory in a timely manner, experience shipping delays, or incur increased costs and expenses, all of which would substantially harm our business and results of operations.

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None.

As of December 28, 2013, the total square footage of our leased office and, distribution centers was 639,000 square feet. This includes approximately 596,000 square feet for our corporate headquarters and distribution centers located in Carson, California, LaSalle, Illinois and Chesapeake, Virginia; and approximately 43,000 square feet of office space in the Philippines. For additional information regarding our obligations under property leases, see “Note 10-Commitments and Contingencies” of the Notes to Consolidated Financial Statements, included in Part IV, Item 15 of this report.

The information set forth under the caption “Legal Matters” in “Note 10-Commitments and Contingencies” of the Notes to Consolidated Financial Statements, included in Part IV, Item 15 of this report, and is incorporated herein by reference. For an additional discussion of certain risks associated with legal proceedings, see the section entitled “Risk Factors” in Item 1A of this report.

Not applicable.

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PART II

Market Information

Our common stock is being trading on the Nasdaq under the symbol “PRTS.” The table below sets forth the high and low sales prices of our common stock for the periods indicated:

On March 6, 2014, the last reported sale price of our common stock on the Nasdaq was $2.47 per share.

Holders

As of March 6, 2014, there were approximately 1,660 holders of record of our common stock.

Stock Performance Graph

The material in this section is not “soliciting material,” is not deemed “filed” with the SEC, and shall not be deemed to be incorporated by reference into any of our filings under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended.

The following graph shows a quarterly comparison of the total cumulative returns of an investment of $100 in cash on December 31, 2008, in (i) our common stock, (ii) the Morgan Stanley Technology Index, (iii) the S&P 500 Retail Index and (iv) NASDAQ Composite Index, in each case through December 28, 2013. The performance of our stock, the Morgan Stanley Technology Index, the S&P 500 Retail Index and the NASDAQ Composite Index have been obtained from online data available. We have used the available prices at the end of the week closest to the end of the period for the purposes of the graph. The comparisons in the graph are required by the SEC and are not intended to forecast or be indicative of the possible future performance of our common stock. The graph assumes that all common stock dividends have been reinvested (to date, we have not declared dividends on our common stock).

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Dividend Policy

No dividends on common stock were paid during the fifty-two weeks ended December 28, 2013. We paid approximately $64,000 of dividends in cash and approximately $60,000 in common stock to our Series A Preferred shareholders during the fifty-two weeks ended December 28, 2013. We accrued $60,000 of preferred stock dividends as of December 28, 2013 and which were paid in arrears. No dividends were paid during fiscal year 2012. We do not anticipate that we will declare or pay any cash dividends on our common stock in the foreseeable future; however, we will have to pay dividends to our preferred shareholders until such shares are redeemed or converted. In April 2012, the Company, certain of its wholly-owned domestic subsidiaries and JPMorgan Chase Bank, N.A. (‘JPMorgan”) entered into a Credit Agreement that provides for a revolving commitment in an aggregate principal amount of up to $40 million subject to a borrowing base derived from certain of our receivables, inventory and property and equipment. On August 2, 2013, the Company, certain of its wholly-owned domestic subsidiaries and JPMorgan entered into a third amendment to the Credit Agreement (“Third Amended Credit Agreement”) amending the Credit Agreement to, among other things, reduce the revolving commitment to an aggregate principal amount of up to $20 million. The Credit Agreement requires us to obtain a prior written consent from JPMorgan Chase Bank when we determine to pay any dividends on or make any distribution with respect to our common stock. Under the Second Amendment to Credit Agreement dated March 25, 2013, we obtained written consent from JPMorgan Chase Bank to pay dividends on our Series A Preferred Shares. See “Liquidity and Capital Resources” in Item 7 of Part II included in this report for further information on the covenants under the secured credit facility. Any future determination to pay cash dividends on our common stock will be subject to the above restriction, as well as restrictions under any other existing indebtedness, at the discretion of our Board of Directors and will be dependent upon our financial condition, results of operations, capital requirements, and other factors the Board of Directors deems relevant.

Recent Sales of Unregistered Securities

None.

Use of Proceeds from Sales of Registered Securities

None.

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Purchases of Equity Securities by the Issuer and Affiliated Purchasers

We did not repurchase any of our outstanding equity securities during the most recent quarter covered by this report.

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The following selected financial information as of and for the dates and periods indicated have been derived from our audited consolidated financial statements. The information set forth below is not necessarily indicative of results of future operations, and should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Part II, Item 7 of this report and our consolidated financial statements and related notes included elsewhere in this report (in thousands, except per share data).

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Cautionary Statement

You should read the following discussion and analysis in conjunction with our consolidated financial statements and the related notes thereto contained in Part IV, Item 15 of this report. Certain statements in this report, including statements regarding our business strategies, operations, financial condition, and prospects are forward-looking statements. Use of the words “anticipates,” “believes,” “could,” “estimates,” “expects,” “intends,” “may,” “plans,” “potential,” “predicts,” “projects,” “should,” “will,” “would”, “will likely continue,” “will likely result” and similar expressions that contemplate future events may identify forward-looking statements.

The information contained in this section is not a complete description of our business or the risks associated with an investment in our common stock. We urge you to carefully review and consider the various disclosures made by us in this report and in our other reports filed with the SEC, which are available on the SEC’s website at http://www.sec.gov. The section entitled “Risk Factors” set forth in Part I, Item 1A of this report, and similar discussions in our other SEC filings, describe some of the important factors, risks and uncertainties that may affect our business, results of operations and financial condition and could cause actual results to differ materially from those expressed or implied by these or any other forward-looking statements made by us or on our behalf. You are cautioned not to place undue reliance on these forward-looking statements, which are based on current expectations and reflect management’s opinions only as of the date thereof. We do not assume any obligation to revise or update forward-looking statements. Finally, our historic results should not be viewed as indicative of future performance.

Overview

We are one of the largest online providers of aftermarket auto parts, including body parts, engine parts, and performance parts and accessories. Our user-friendly websites provide customers with a broad selection of SKUs, with detailed product descriptions and photographs. Our proprietary product database maps our SKUs to product applications based on vehicle makes, models and years. We principally sell our products to individual consumers through our network of websites and online marketplaces. Our flagship websites are located at www.autopartswarehouse.com, www.jcwhitney.com and www.AutoMD.com and our corporate website is located at www.usautoparts.net. We believe our strategy of disintermediating the traditional auto parts supply chain and selling products directly to customers over the Internet allows us to more efficiently deliver products to our customers while generating higher margins.

Our History. We were formed in Delaware in 1995 as a distributor of aftermarket auto parts and launched our first website in 2000. We rapidly expanded our online operations, increasing the number of SKUs sold through our e-commerce network, adding additional websites, improving our Internet marketing proficiency and commencing sales in online marketplaces. Additionally, in August 2010, through our acquisition of Whitney Automotive Group, Inc. (referred to herein as “WAG”), we expanded our product-lines and increased our customer reach in the do-it-yourself (“DIY”) automobile and off-road accessories market. As a result, our business has grown since 2000. We have had a decline in our revenues and incurred losses in 2011, 2012 and 2013, which may continue in 2014.

International Operations. In April 2007, we established offshore operations in the Philippines. Our offshore operations allow us to access a workforce with the necessary technical skills at a significantly lower cost than comparably experienced U.S.-based professionals. Our offshore operations are responsible for a majority of our website development, catalog management, and back office support. Our offshore operations also house our main call center. We had 945 employees in the

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Philippines as of December 29, 2012. In January 2013, we laid off 163 employees in the Philippines which reduced our workforce to 782 in the Philippines. We had 714 employees in the Philippines as of December 28, 2013. We believe that the cost advantages of our offshore operations provide us with the ability to grow our business in a cost-effective manner.

Acquisitions. From time to time, we may acquire certain businesses, websites, domain names, or other assets. In 2009, we completed the acquisition of the assets of a small website and the related domain names which further expanded and enhanced our product offering and our ability to reach more customers. In the first quarter of 2010, we completed two additional website and domain name asset acquisitions, which increased our net sales and internet traffic. In August 2010, Go Fido, Inc., a wholly-owned subsidiary of ours, completed the purchase of all of the outstanding capital stock of Automotive Specialty Accessories and Parts, Inc. and its wholly-owned subsidiary WAG. WAG’s Midwest facility expanded our distribution network and the merchandise WAG offers extended our go-to market product-lines into all terrain vehicles, recreational vehicles and motorcycles, and provided us with deep product knowledge into niche segments like Jeep, Volkswagen and trucks. This expansion of our product line increased our customer reach in the DIY automobile and off-road accessories market. Related to the WAG acquisition, the Company incurred acquisition and integration related costs of $7.4 million for the fiscal year 2011. Currently, we do not intend to pursue any acquisition opportunities in the near future. Our Credit Agreement with JPMorgan currently restricts our ability to enter into any acquisitions without prior permission from JPMorgan.

To understand revenue generation through our network of e-commerce websites, we monitor several key business metrics, including the following:

Unique Visitors: A unique visitor to a particular website represents a user with a distinct IP address that visits that particular website. We define the total number of unique visitors in a given month as the sum of unique visitors to each of our websites during that month. We measure unique visitors to understand the volume of traffic to our websites and to track the effectiveness of our online marketing efforts. The number of unique visitors has historically varied based on a number of factors, including our marketing activities and seasonality. Included in the unique visitors are mobile device based customers, who are becoming an increasing part of our business. Shifting consumer behavior and technology enhancements indicates that customers are becoming more inclined to purchase auto parts through their mobile devices. User sophistication and technological advances have increased consumer expectations around the user experience on mobile devices, including speed of response, functionality, product availability, security, and ease of use. We believe enhancements to online solutions specifically catering to mobile based shopping can result in an increase in the number of orders and revenues. We believe an increase in unique visitors to our websites will result in an increase in the number of orders. We seek to increase the number of unique visitors to our websites by attracting repeat customers and improving search engine marketing and other internet marketing activities. During fiscal year 2013, our unique visitors decreased by 21% compared to the fiscal year 2012. We expect the total number of unique visitors in 2014 to marginally improve, as we continue to address the challenges we are experiencing from changes search engines have made to the formulas, or algorithms, that they use to optimize their search results, as described in further detail under “—Executive Summary” below.

Total Number of Orders: We monitor the total number of orders as an indicator of future revenue trends. During the fiscal year 2013, the total number of orders was down by 20% compared to the fiscal year 2012 due to the decrease in unique visitors combined with overall increased competition. We expect the total number of orders in 2014 to marginally improve. We recognize revenue associated with an order when the products have been delivered, consistent with our revenue recognition policy.

Average Order Value: Average order value represents our net sales on a placed orders basis for a given period of time divided by the total number of orders recorded during the same period of time. During the fiscal year 2013, our average order value decreased by 2% compared to the fiscal year 2012. We expect this trend to continue in 2014 primarily due to increased

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competition, as described in further detail under “Executive Summary” below. We seek to increase the average order value as a means of increasing net sales. Average order values vary depending upon a number of factors, including the components of our product offering, the order volume in certain online sales channels, macro-economic conditions, and the competition online.

Revenue Capture: Revenue capture is the amount of actual dollars retained after taking into consideration returns, credit card declines and product fulfillment. During the fiscal year 2013, our revenue capture marginally decreased by 0.6% to 83.3% compared to 83.9% in fiscal year 2012. The decrease in revenue capture was due to an increase in credit card declines and product fulfillment issues in 2013 compared to 2012. We expect our revenue capture level to improve in 2014 as we continue to improve our customers’ purchase experience.

Executive Summary

For fiscal year 2013, the Company generated net sales of $254.8 million, compared with $304.0 million for fiscal year 2012, representing a decrease of 16.2%. Included in the net sales decrease of 16.2% in fiscal year 2013, is a decrease in net sales channels, excluding websites we retired in 2013, of 8.5%. Net loss for fiscal year 2013 was $15.6 million, or $0.48 per share. This compares to a net loss of $36.0 million, or $1.17 per share, for fiscal year 2012. We generated net income before interest expense, net, income tax provision, depreciation and amortization expense and amortization of intangible assets, plus share-based compensation expense, impairment loss and restructuring costs (“Adjusted EBITDA”) of $6.0 million in fiscal year 2013 compared to $9.4 million in fiscal year 2012. Adjusted EBITDA, which is a non Generally Accepted Accounting Principle measure, is presented because such measure is used by rating agencies, securities analysts, investors and other parties in evaluating the Company. It should not be considered, however, as an alternative to operating income, as an indicator of the Company’s operating performance, or as an alternative to cash flows as measures of the Company’s overall liquidity, as presented in the Company’s consolidated financial statements. Further, the Adjusted EBITDA measure shown may not be comparable to similarly titled measures used by other companies. Refer to the table presented below for reconciliation of net loss to Adjusted EBITDA.

Total revenues decreased in fiscal year 2013 compared to the same period in 2012 primarily due to our decreased online sales. Our online sales, which include our e-commerce, online marketplace sales channels and online advertising, contributed 90.0% of total revenues, and our offline sales, which consist of our Kool-Vue™ and wholesale operations, contributed 10.0% of total revenues. Our online sales for fiscal year 2013 decreased by $49.7 million, or 17.8%, to $229.4 million compared to $279.1 million in fiscal year 2012 primarily due to a 21% reduction in unique visitors and 20% decrease in total number of orders. Our offline sales increased by $0.5 million, or 2.0%, to $25.4 million compared to the same period last year. Revenues declined primarily during the period starting the third quarter of 2012. The highest decline, quarter over quarter was during the first quarter of 2013 (25%) as compared to the first quarter of 2012 and the least in the fourth quarter of 2013 compared to the fourth quarter of 2012 (5%). The table represents the reduction in revenues when compared by quarters. Net sales for the third and fourth quarters of 2011 have been included for comparative purposes only.

Like most e-commerce retailers, our success depends on our ability to attract online consumers to our websites and convert them into customers in a cost-effective manner. Historically, marketing through search engines provided the most efficient opportunity to reach millions of online auto part buyers. We are included in search results through paid search listings, where we purchase specific search terms that will result in the inclusion of our listing, and algorithmic searches that depend upon the searchable content on our websites. In 2013, we decreased the amount we spent on paid search listings, as we have determined that it does not generate a sufficient amount of revenues to justify the expense. Algorithmic listings cannot be purchased and instead are determined and displayed solely by a set of formulas utilized by the search engine. We have had a history of success with our search engine marketing techniques, which gave our different websites preferred positions in search results. But search engines, like Google, revise their algorithms regularly in an attempt to optimize their search results. In fiscal years 2012 and 2013, we were negatively impacted by the changes in methodology for how Google displayed or selected our different websites for customer search results, which reduced our unique visitor count and adversely

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affected our financial results. Our unique visitor count decreased by 36 million, or 21%, for fiscal year 2013 to 132.9 million unique visitors compared to 168.9 million unique visitors in fiscal year 2012. We believe we were affected by these search engine algorithm changes due to the use of our product catalog across multiple websites. To address this issue we consolidated to a significantly smaller number of websites to ensure unique catalog content. As we are significantly dependent upon search engines for our website traffic, if we are unable to attract unique visitors, our business and results of operations will suffer.

Barriers to entry in the automotive aftermarket industry are low, and current and new competitors can launch websites at a relatively low cost. Due to a number of factors, including the rise of online marketplaces, it is easier for a traditional offline supplier to begin selling online and compete with us. These larger suppliers have access to merchandise at lower costs, enabling them to sell products at lower prices while maintaining adequate gross margins. Our financial results were negatively impacted by the increased level of competition. Total orders for fiscal year 2013 went down by 20% to 1.9 million compared to 2.4 million for fiscal year 2012 and our average order value went down marginally by $2.4, or 2%, for fiscal year 2013 to $111.9 compared to $114.3 in fiscal year 2012 as a result of increased pricing competition. Our current and potential customers may decide to purchase directly from our suppliers. Continuing increased competition from our suppliers that have access to products at lower prices than us could result in reduced sales, lower operating margins, reduced profitability, loss of market share and diminished brand recognition. In addition, some of our competitors have used and may continue to use aggressive pricing tactics. We expect that competition will further intensify in the future as Internet use and online commerce continue to grow worldwide. We took a number of steps during 2013 to attempt to reduce the selling prices of our products while increasing margins, which are discussed below.

Total expenses, which primarily consisted of cost of sales and operating costs, decreased in fiscal year 2013 compared to the same period in 2012. Components of our cost of sales and operating costs are described in further detail under — “Basis of Presentation” below.

Personnel costs decreased in fiscal year 2013 compared to fiscal year 2012. Our employees at the end of fiscal year 2013 decreased by about 25% to 1,032 compared to 1,370 at the end of fiscal year 2012. Our employees in the Philippines decreased to 714 at the end of fiscal year 2013 compared to 945 at the end of fiscal year 2012. In the first half of 2013, as part of our initiatives to reduce labor costs and improve operating efficiencies in response to the challenges in the marketplace and general market conditions, we reduced our workforce by 191 employees (for additional details, refer to “Note 12-Restructuring Costs” of the Notes to Consolidated Financial Statements, included in Part I, Item 1 of this report). While we have and continue to undertake several initiatives to improve revenues and reduce the losses in 2014, if the downward trend in our revenues and net loss continue in 2014, we may be required to further reduce our labor costs. In addition to the decrease in personnel costs, total expenses decreased in fiscal year 2013 compared to fiscal year 2012 primarily due to the decrease in lower impairment losses, reduction in advertising expense, and lower depreciation and amortization due to certain property and equipment and intangible assets that were fully depreciated, fully amortized or impaired.

Overall, we expect a reduced downward trend on our revenues and net loss into the first half of 2014 due to the initiatives we have implemented. We have already observed a slow-down in the decline in revenues between the third quarter of 2012 to the fourth quarter of 2013 when compared to the respective periods of 2011 and 2012. The trend indicates an improvement in revenues in the latter part of 2014. However, if this downward trend does continue in 2014 and is more negative than we expect, it could severely impact our liquidity as we may not be able to provide positive cash flows from operations in order to meet our working capital requirements. We may need to borrow additional funds from our credit facility, which under certain circumstances may not be available, sell additional assets or seek additional equity or additional debt financing in the future. Refer to the “Liquidity and Capital Resources” section below for additional details. There can be no assurance that we would be able to raise such additional financing or engage in such asset sales on acceptable terms, or at all. If our expected downward trend in revenues and net loss continues for longer than we expect because our strategies to return to positive sales growth and profitability are not successful or otherwise, and if we are not able to raise adequate additional financing or proceeds from additional asset sales to continue to fund our ongoing operations, we will need to defer, reduce or eliminate significant planned expenditures, restructure or significantly curtail our operations.

In 2013, we made positive strides towards achieving our strategic goals and in 2014; we will continue to pursue these strategies to return to positive sales growth and profitability:

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As we redesign our approach to attracting customers through search engines, we hope to offset much of the revenue loss by pursuing revenue opportunities in third-party online marketplaces, a number of which are growing significantly per year. Auto parts buyers are finding third-party online marketplaces to be a very attractive environment, for many reasons, the top four being: (1) the security of their personal information; (2) the ability to easily compare product offerings from multiple sellers; (3) transparency (consumers can leave positive or negative feedback about their experience); and (4) favorable pricing. Successful selling in these third-party online marketplaces depends on product innovation, and strong relationships with suppliers, both of which we believe to be our core competencies.

There are various macro-economic factors that indirectly affect our business, including the impact of the slow growth of the economy, continued high unemployment and underemployment, and other challenging economic conditions. These factors decrease the overall discretionary spending of our customers and we believe it becomes more likely that consumers will keep their current vehicles longer, thus will need replacement parts as a result of general wear and tear, and perform repair and maintenance in order to keep those vehicles well maintained. At the same time, higher gas prices are negatively impacting the industry as consumers drive less and reduce the wear and tear on their vehicles. Given the nature of these factors, and the volatility of the overall economic environment, we cannot predict whether or for how long these trends will continue, nor can we predict to what degree these trends will impact us in the future.

Adjusted EBITDA, which is a non Generally Accepted Accounting Principle measure, is presented because such measure is used by rating agencies, securities analysts, investors and other parties in evaluating the Company. It should not be considered, however, as an alternative to operating income, as an indicator of the Company’s operating performance, or as an alternative to cash flows as measures of the Company’s overall liquidity, as presented in the Company’s consolidated financial statements. Further, the Adjusted EBITDA measure shown may not be comparable to similarly titled measures used by other companies. The table below reconciles net loss to Adjusted EBITDA for the periods presented (in thousands):

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Basis of Presentation

Net Sales. Online and offline sales represent two different sales channels for our products. We generate online net sales primarily through the sale of auto parts to individual consumers through our network of e-commerce websites, which includes mobile based sales, and online marketplaces, including online advertising. E-commerce sales are derived from our network of websites, which we own and operate. E-commerce and online marketplace sales also include inbound telephone sales through our call center that supports these sales channels. Online marketplaces consist primarily of sales of our products on online auction websites, where we sell through auctions as well as through storefronts that we maintain on third-party owned websites. We sell advertising and sponsorship positions on our e-commerce websites to highlight vendor brands and offer complementary products and services that benefit our customers. Advertising is targeted to specific sections of the websites and can also be targeted to specific users based on the vehicles they drive. Advertising partners primarily include part vendors, national automotive aftermarket brands and automobile manufacturers. Our offline sales channel represents our distribution of products directly to commercial customers by selling auto parts to collision repair shops located in Southern California and Virginia. Our offline sales channel also includes the distribution of our Kool-Vue™ mirror line to auto parts distributors nationwide. We also serve consumers by operating a retail outlet store in LaSalle, Illinois.

Cost of Sales. Cost of sales consists of the direct costs associated with procuring parts from suppliers and delivering products to customers. These costs include direct product costs, outbound freight and shipping costs, warehouse supplies and warranty costs, partially offset by purchase discounts and cooperative advertising. Depreciation and amortization expenses are excluded from cost of sales and included in marketing, general and administrative and fulfillment expenses as noted below.

Marketing Expense. Marketing expense consists of online advertising spend, internet commerce facilitator fees and other advertising costs, as well as payroll and related expenses associated with our marketing catalog, customer service and sales personnel. These costs are generally variable and are typically a function of net sales. Marketing expense also includes depreciation and amortization expense and share-based compensation expense.

General and Administrative Expense. General and administrative expense consists primarily of administrative payroll and related expenses, merchant processing fees, legal and professional fees and other administrative costs. General and administrative expense also includes depreciation and amortization expense and share-based compensation expense.

Fulfillment Expense. Fulfillment expense consists primarily of payroll and related costs associated with our warehouse employees and our purchasing group, facilities rent, building maintenance, depreciation and other costs associated with inventory management and our wholesale operations. Fulfillment expense also includes share-based compensation expense.

Technology Expense. Technology expense consists primarily of payroll and related expenses of our information technology personnel, the cost of hosting our servers, communications expenses and Internet connectivity costs, computer support and software development amortization expense. Technology expense also includes share-based compensation expense.

Amortization of Intangible Assets. Amortization of intangibles consists of the amortization expense associated with our definite-lived intangible assets.

Impairment Loss. Impairment loss is recorded as a result of impairment testing performed for goodwill and indefinite-lived intangible assets in accordance with ASC 350 Intangibles – Goodwill and Other, and long-lived assets, including intangible assets subject to amortization, in accordance with ASC 360 Property, Plant and Equipment.

Other Income, Net. Other income, net consists of miscellaneous income or expense such as gains/losses from disposition of assets, and interest income comprised primarily of interest income on investments.

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Interest Expense. Interest expense consists primarily of interest expense on our outstanding loan balance, deferred financing cost amortization and capital lease interest.

Segment Data.

The Company operates in two reportable segments. The criteria the Company uses to identify its operating segments are primarily the nature of the products the Company sells and the consolidated operating results that are regularly reviewed by the Company’s chief operating decision maker to assess performance and make operating decisions. Certain long-lived assets are held in the Philippines (refer to “Note 4 – Property and Equipment, Net”). In 2012, we identified two reporting units, Base USAP, which is the core auto parts business, and AutoMD, an online automotive repair source, in accordance with ASC 280 Segment Reporting (“ASC 280”). AutoMD recorded revenues of $0.3 million and $0.4 million for fiscal years 2013 and 2012, respectively. AutoMD incurred total expenses of $2.3 million and $2.4 million during fiscal years 2013 and 2012, respectively, which are primarily related to depreciation and amortization expense of capitalized website and software development costs. AutoMD recorded net losses of $2.0 million for both fiscal years 2013 and 2012, respectively. Total assets for AutoMD were $2.1 million and $2.0 million as of December 28, 2013 and December 29, 2012, respectively, which are primarily related to capitalized website and software development costs. Prior to fiscal year 2012, our reporting unit AutoMD had been considered a part of our main reporting unit, Base USAP. There was no distinguishable business of AutoMD and revenues, expenses and assets were insignificant to the overall business and hence not reported separately in accordance with the thresholds defined by ASC 280.

Results of Operations

The following table sets forth selected statement of operations data for the periods indicated, expressed as a percentage of net sales:

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Fifty-Two Weeks Ended December 28, 2013 Compared to the Fifty-Two Weeks Ended December 29, 2012

Net Sales and Gross Margin

Net sales decreased $49.3 million, or 16.2%, for fiscal year 2013 compared to fiscal year 2012. Our net sales consisted of online sales, which included mobile based online sales, representing 90.0% of the total for fiscal year 2013 (compared to 91.8% in fiscal year 2012), and offline sales, representing 10.0% of the total for fiscal year 2013 (compared to 8.2% in fiscal year 2012). The net sales decrease was due to a decline of $49.7 million, or 17.8%, in online sales, partially offset by a $0.5 million, or 2.0%, increase in offline sales. Included in the net sales decrease of 16.2% in fiscal year 2013, is a decrease in net sales channels, excluding websites we retired in 2013, of 8.5%. Online sales decreased primarily due to a 21% reduction in unique visitors, a 20% reduction in total number of orders and a decline in average order value by 2%. The overall decrease in unique visitors was due to a reduction in customer traffic as a result of changes search engines made to the algorithms that search engines use to optimize their search results. Also, our revenues were negatively impacted by the increased competition as described in further detail under “Executive Summary” above. Our offline sales, which consist of our Kool-Vue™ and wholesale operations, continued to show growth. While net sales declined for fiscal year 2013 as compared to fiscal year 2012, we have observed a slow-down in the decline in revenues between the first quarter of 2013 to the fourth quarter of 2013, when compared to the respective quarters of 2012, as described in further detail under “Executive Summary” above.

Gross profit decreased $17.5 million, or 19.1%, in fiscal year 2013 compared to fiscal year 2012. Gross margin decreased 1.0% to 29.1% in fiscal year 2013 compared to 30.1% in fiscal year 2012. Gross margin primarily decreased in fiscal year 2013 compared to fiscal year 2012 due to reduced margins from online sales and partially offset by higher margins on offline sales. Our gross profit and gross margins were negatively impacted by the factors described in further detail under “Executive Summary” above.

Marketing Expense

Total marketing expense decreased $10.4 million, or 20.2%, for fiscal year 2013 compared to fiscal year 2012. Online advertising expense, which includes catalog costs, was $16.6 million, or 7.2%, of online sales for fiscal year 2013, compared to $21.1 million, or 7.5%, of online sales for fiscal year 2012. Online advertising expense decreased primarily due to reduced online e-commerce advertising and non-catalog advertising costs of $4.4 million. Marketing expense, excluding online advertising, was $24.4 million, or 9.6%, of net sales for fiscal year 2013, compared to $30.3 million, or 10.0%, of net sales for fiscal year 2012. Marketing expenses, excluding online advertising, decreased primarily due to lower call center wages, marketing overhead, depreciation and amortization expense and stock-based compensation.

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General and Administrative Expense

General and administrative expense decreased $2.3 million, or 11.5%, for fiscal year 2013 compared to fiscal year 2012. The decrease for fiscal year 2013 as compared to fiscal year 2012 was primarily due to reduced merchant processing fees resulting from lower online sales and lower overhead.

Fulfillment Expense

Fulfillment expense decreased $3.6 million, or 16.0%, for fiscal year 2013 compared to fiscal year 2012. The decrease was primarily due to lower shipments and revenues, lower depreciation and amortization expense because of certain assets that were fully depreciated after the third quarter of 2012 and lower warehouse wages and salaries. Also, severance charges were lower in fiscal year 2013 compared to the prior fiscal year.

Technology Expense

Technology expense decreased $1.1 million, or 18.3%, for fiscal year 2013 compared to fiscal year 2012. The decrease was primarily due to lower telephone costs and technology wages incurred in fiscal year 2013 compared to the fiscal year 2012.

Amortization of Intangible Assets

Amortization of intangibles decreased by $0.8 million, or 68.0%, for fiscal year 2013 compared to fiscal year 2012. The decrease was primarily due to certain intangible assets that were impaired in the fourth quarter of 2012. We recorded impairment losses on intangible assets subject to amortization of $1.2 million, which reduced the net carrying amount of those intangible assets to zero in the fourth quarter of 2012.

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Impairment Loss on Goodwill

Impairment loss on goodwill consists of a non-cash impairment charge during the fourth quarter of 2012 for the excess of the carrying value over the implied fair value of goodwill in the amount of $18.9 million. See further detail in “Note 1- Summary of Significant Accounting Policies and Nature of Operations”, “Note 3 – Fair Value Measurements” and “Note 5- Goodwill and Indefinite-Lived Intangibles” of the Notes to Consolidated Financial Statements included in Part IV, Item 15 of this report and under “Critical Accounting Policies and Estimates” section below.

Impairment Loss on Property and Equipment