Item 1A. Risk Factors (Continued)

warehouse and online businesses depend upon the secure transmission of encrypted confidential information over public networks, including information permitting cashless payments. A compromise of our security systems or those of our business associates, that results in our members' information being obtained by unauthorized persons, could adversely affect our reputation with our members and others, as well as our operations, results of operations, financial condition and liquidity, and could result in litigation against us or the imposition of penalties. In addition, a breach could require that we expend significant additional resources related to the security of information systems and could disrupt our operations.

The use of data by our business and our business associates is regulated at the national and state or local level in all of our operating countries. Privacy and information-security laws and regulations change, and compliance with them may result in cost increases due to necessary systems changes and the development of new processes. If we or those with whom we share information fail to comply with these laws and regulations, our reputation could be damaged, possibly resulting in lost future business, and we could be subjected to additional legal risk as a result of non-compliance.

Our security measures may be undermined due to the actions of outside parties, employee error, internal or external malfeasance, or otherwise, and, as a result an unauthorized party may obtain access to our data systems and misappropriate business and personal information. Because the techniques used to obtain unauthorized access, disable or degrade service, or sabotage systems change frequently and may not immediately produce signs of intrusion, we may be unable to anticipate these techniques, timely discover or counter them, or implement adequate preventative measures. Any such breach or unauthorized access could result in significant legal and financial exposure, damage to our reputation, and potentially have an adverse effect on our business.

We are subject to payment-related risks.

We accept payments using a variety of methods, including cash and checks, a select variety of credit and debit cards, and our proprietary cash card. As we offer new payment options to our members, we may be subject to additional rules, regulations, compliance requirements, and higher fraud losses. For certain payment methods, we pay interchange and other related card acceptance fees, along with additional transaction processing fees. We rely on third parties to provide payment transaction processing services, including the processing of credit and debit cards, and our proprietary cash card, and it could disrupt our business if these companies become unwilling or unable to provide these services to us. We are also subject to payment card association and network operating rules, including data security rules, certification requirements and rules governing electronic funds transfers, which could change over time. For example, we are subject to Payment Card Industry Data Security Standards (“PCI DSS”), which contain compliance guidelines and standards with regard to our security surrounding the physical and electronic storage, processing and transmission of individual cardholder data. In addition, if our internal systems are breached or compromised, we may be liable for card re-issuance costs, subject to fines and higher transaction fees and lose our ability to accept credit and/or debit card payments from our members, and our business and operating results could be adversely affected.

We might sell products that cause unexpected illness or injury to our members, harm to our reputation, and expose us to litigation.

If our merchandise offerings, such as food and prepared food products for human consumption, drugs, children's products, pet products, and durable goods, do not meet or are perceived not to meet applicable safety standards or our members' expectations regarding safety, we could experience lost sales, increased costs, litigation or reputational harm. The sale of these items involves the risk of health-related illness or injury to our members. Such illnesses or injuries could result from tampering by unauthorized third parties, product contamination or spoilage, including the presence of foreign objects, substances, chemicals, other agents, or residues introduced during the growing, manufacturing, storage, handling and transportation phases, or faulty design. Our vendors are generally contractually required to comply with product safety laws, and we are dependent on them to ensure that the products we buy comply with all safety standards. While we are subject to governmental inspection and regulations and work to comply in all material respects

Item 1A—Risk Factors (Continued)

with applicable laws and regulations, we cannot be sure that consumption or use of our products will not cause a health-related illness or injury in the future or that we will not be subject to claims, lawsuits, or government investigations relating to such matters resulting in costly product recalls and other liabilities that could adversely affect our business and results of operations. Even if a product liability claim is unsuccessful or is not fully pursued, negative publicity could adversely affect our reputation with existing and potential members and our corporate and brand image, and these effects could be long term.

We may not timely identify or effectively respond to consumer trends, which could negatively affect our relationship with our members, the demand for our products and services, and our market share.

It is difficult to consistently and successfully predict the products and services that our members will desire. Our success depends, in part, on our ability to identify and respond to trends in demographics and consumer preferences. Failure to identify timely or effectively respond to changing consumer tastes, preferences (including those relating to sustainability of product sources and animal welfare) and spending patterns could negatively affect our relationship with our members, the demand for our products and services and our market share. If we are not successful at predicting our sales trends and adjusting our purchases accordingly, we may have excess inventory, which could result in additional markdowns and reduce our operating performance. This could have an adverse effect on net sales, gross margin and operating income.

If we do not successfully develop and maintain a relevant multichannel experience for our members, our results of operations could be adversely impacted.

Multichannel retailing is rapidly evolving and we must keep pace with changing member expectations and new developments by our competitors. Our members are increasingly using mobile phones, tablets, computers, and other devices to shop and to interact with us through social media. We are making technology investments in our websites and mobile applications. If we are unable to make, improve, or develop relevant member-facing technology in a timely manner, our ability to compete and our results of operations could be adversely affected.

Inability to attract, train and retain highly qualified employees could adversely impact our business, financial condition and results of operations.

Our success depends on the continued contributions of members of our senior management and other key operations, merchandising and administrative personnel. Failure to identify and implement a succession plan for key senior management could negatively impact the business.

We must attract, train and retain a large and growing number of qualified employees, while controlling related labor costs and maintaining our core values. Our ability to control labor and benefit costs is subject to numerous internal and external factors, including regulatory changes, prevailing wage rates, and healthcare and other insurance costs. We compete with other retail and non-retail businesses for these employees and invest significant resources in training and motivating them. There is no assurance that we will be able to attract or retain highly qualified employees in the future, which could have a material adverse effect on our business, financial condition and results of operations.

We may incur property, casualty or other losses not covered by our insurance.

We are predominantly self-insured, with insurance coverage for certain catastrophic risks, for employee health care benefits, workers’ compensation, general liability, property damage, directors’ and officers’ liability, vehicle liability and inventory loss. The types and amounts of insurance may vary from time to time based on our decisions with respect to risk retention and regulatory requirements. The occurrence of significant claims, a substantial rise in costs to maintain our insurance or the failure to maintain adequate insurance coverage could have an adverse impact on our financial condition and results of operations.

Item 1A—Risk Factors (Continued)

We are primarily self-insured as it relates to property damage, due to the substantial premiums required for insurance coverage over physical losses caused by certain natural disasters, as well as the limitations on available coverage for such losses. Although we maintain specific coverages for losses from physical damages in excess of certain amounts to guard against catastrophic losses, we still bear the risk of losses incurred as a result of any physical damage to, or the destruction of, any warehouses, depots, manufacturing or home office facilities, loss or spoilage of inventory, and business interruption caused by any such events to the extent they are below catastrophic levels of coverage, as well as any losses to the extent they exceed our aggregate limits of applicable coverages. Such losses could materially impact our cash flow and results of operations.

Market and Other External Risks

We face strong competition from other retailers and warehouse club operators, which could adversely affect our business, financial condition and results of operations.

The retail business is highly competitive. We compete for members, employees, sites, products and services and in other important respects with a wide range of local, regional and national wholesalers and retailers, both in the United States and in foreign countries, including other warehouse club operators, supermarkets, supercenters, internet retailers, gasoline stations, hard discounters, and department and specialty stores. Such retailers and warehouse club operators compete in a variety of ways, including merchandise pricing, selection and availability, services, location, convenience, store hours, and the attractiveness and ease of use of websites and mobile applications. The evolution of retailing in online and mobile channels has improved the ability of customers to comparison shop with digital devices, which has enhanced competition. Some competitors may have greater financial resources, better access to merchandise and greater market penetration than we do. Our inability to respond effectively to competitive pressures, changes in the retail markets and member expectations could result in lost market share and negatively affect our financial results.

General economic factors, domestically and internationally, may adversely affect our business, financial condition, and results of operations.

Higher energy and gasoline costs, inflation, levels of unemployment, healthcare costs, consumer debt levels, foreign-currency exchange rates, unsettled financial markets, weaknesses in housing and real estate markets, reduced consumer confidence, changes and uncertainties related to government fiscal and tax policies including increased duties, tariffs, or other restrictions, sovereign debt crises, and other economic factors could adversely affect demand for our products and services, require a change in product mix, or impact the cost of or ability to purchase inventory. Prices of certain commodity products, including gasoline and other food products, are historically volatile and are subject to fluctuations arising from changes in domestic and international supply and demand, labor costs, competition, market speculation, government regulations, taxes and periodic delays in delivery. Rapid and significant changes in commodity prices and our ability and desire to pass them through to our members may affect our sales and profit margins. These factors could also increase our merchandise costs and selling, general and administrative expenses, and otherwise adversely affect our operations and financial results. General economic conditions can also be affected by significant events like the outbreak of war or acts of terrorism.

Vendors may be unable to supply us with quality merchandise at competitive prices in a timely manner or may fail to adhere to our high standards, resulting in adverse effects on our business, merchandise inventories, sales, and profit margins.

We depend heavily on our ability to purchase quality merchandise in sufficient quantities at competitive prices. As the quantities we require continue to grow, we have no assurances of continued supply, appropriate pricing or access to new products, and any vendor has the ability to change the terms upon which they sell to us or discontinue selling to us. Member demands may lead to out-of-stock positions of our merchandise leading to loss of sales and profits.

Item 1A—Risk Factors (Continued)

We buy from numerous domestic and foreign manufacturers and importers. Our inability to acquire suitable merchandise on acceptable terms or the loss of key vendors could negatively affect us. We may not be able to develop relationships with new vendors, and products from alternative sources, if any, may be of a lesser quality or more expensive than those from existing vendors. Because of our efforts to adhere to high quality standards for which available supply may be limited, particularly for certain food items, the large volume we demand may not be consistently available.

Our suppliers (and those they depend upon for materials and services) are subject to risks, including labor disputes, union organizing activities, financial liquidity, inclement weather, natural disasters, supply constraints, and general economic and political conditions that could limit their ability to timely provide us with acceptable merchandise. For these or other reasons, one or more of our suppliers might not adhere to our quality control, legal, regulatory, labor, environmental or animal welfare standards. These deficiencies may delay or preclude delivery of merchandise to us and might not be identified before we sell such merchandise to our members. This failure could lead to recalls and litigation, and otherwise damage our reputation and our brands, increase our costs, and otherwise adversely impact our business.

Fluctuations in foreign exchange rates may adversely affect our results of operations.

During 2017, our international operations, including Canada, generated 27% and 36% of our net sales and operating income, respectively. Our international operations have accounted for an increasing portion of our warehouses, and we plan to continue international growth. To prepare our consolidated financial statements, we must translate the financial statements of our international operations from local currencies into U.S. dollars using exchange rates for the current period. Future fluctuations in currency exchange rates over time that are unfavorable to us may adversely affect the financial performance of our Canadian and Other International operations and have a corresponding adverse period-over-period effect on our results of operations. As we continue to expand internationally, our exposure to fluctuations in foreign exchange rates may increase.

We may pay for products we purchase for sale in our warehouses around the world with a currency other than the local currency of the country in which the goods will be sold. Currency fluctuations may increase our cost of goods and may not be passed on to members. Consequently, fluctuations in currency exchange rates may adversely affect our results of operations.

Natural disasters or other catastrophes could negatively affect our business, financial condition, and results of operations.

Natural disasters, such as hurricanes, typhoons or earthquakes, particularly in California or Washington state, where our centralized operating systems and administrative personnel are located, could negatively affect our operations and financial performance. Such events could result in physical damage to one or more of our properties, the temporary closure of one or more warehouses, depots, manufacturing or home office facilities, the temporary lack of an adequate work force in a market, the temporary or long-term disruption in the supply of products from some local or overseas suppliers, the temporary disruption in the transport of goods to or from overseas, delays in the delivery of goods to our warehouses or depots within the countries in which we operate, and the temporary reduction in the availability of products in our warehouses. Public health issues, whether occurring in the U.S. or abroad, could disrupt our operations, disrupt the operations of suppliers or members, or have an adverse impact on consumer spending and confidence levels. These events could also reduce demand for our products or make it difficult or impossible to procure products. We may be required to suspend operations in some or all of our locations, which could have a material adverse effect on our business, financial condition and results of operations.

Factors associated with climate change could adversely affect our business.

We use natural gas, diesel fuel, gasoline, and electricity in our distribution and warehouse operations. U.S. and foreign government regulations limiting carbon dioxide and other greenhouse gas emissions may result in increased compliance costs and legislation or regulation affecting energy inputs that could materially affect

Item 1A—Risk Factors (Continued)

our profitability. Climate change could affect our ability to procure needed commodities at costs and in quantities we currently experience. We also sell a substantial amount of gasoline, the demand for which could be impacted by concerns about climate change and which could face increased regulation. Climate change may be associated with extreme weather conditions, such as more intense hurricanes, thunderstorms, tornadoes, and snow or ice storms, as well as rising sea levels.

Failure to meet market expectations for our financial performance could adversely affect the market price and volatility of our stock.

We believe that the price of our stock currently reflects high market expectations for our future operating results. Any failure to meet or delay in meeting these expectations, including our warehouse and e-commerce comparable sales growth rates, membership renewal rates, new member sign-ups, gross margin, earnings, earnings per share, new warehouse openings, or dividend or stock repurchase policies could cause the market price of our stock to decline.

Legal and Regulatory Risks

Our international operations subject us to risks associated with the legislative, judicial, accounting, regulatory, political and economic factors specific to the countries or regions in which we operate which could adversely affect our business, financial condition and results of operations.

During 2017, we operated 227 warehouses in 10 countries outside of the U.S., and we plan to continue expanding our international operations. Future operating results internationally could be negatively affected by a variety of factors, many similar to those we face in the U.S., certain of which are beyond our control. These factors include political and economic conditions, regulatory constraints, currency regulations, policy changes such as the U.K.'s vote to withdraw from the European Union, commonly known as "Brexit", and other matters in any of the countries or regions in which we operate, now or in the future. Other factors that may impact international operations include foreign trade, monetary and fiscal policies and the laws and regulations of the U.S. and foreign governments, agencies and similar organizations, and risks associated with having major facilities located in countries which have been historically less stable than the U.S. Risks inherent in international operations also include, among others, the costs and difficulties of managing international operations, adverse tax consequences, and greater difficulty in enforcing intellectual property rights.

Changes in accounting standards and subjective assumptions, estimates and judgments by management related to complex accounting matters could significantly affect our financial condition and results of operations.

Accounting principles and related pronouncements, implementation guidelines, and interpretations we apply to a wide range of matters that are relevant to our business, including, but not limited to, revenue recognition, merchandise inventories, vendor rebates and other vendor consideration, impairment of long-lived assets, self-insurance liabilities, and income taxes are highly complex and involve subjective assumptions, estimates and judgments by our management. Changes in these rules or their interpretation or changes in underlying assumptions, estimates or judgments by our management could significantly change our reported or expected financial performance.

Provisions for losses related to self-insured risks are generally based upon independent actuarially determined estimates. The assumptions underlying the ultimate costs of existing claim losses can be highly unpredictable, which can affect the liability recorded for such claims. For example, variability in health care cost inflation rates inherent in these claims can affect the amounts recognized. Similarly, changes in legal trends and interpretations, as well as changes in the nature and method of how claims are settled can impact ultimate costs. Although our estimates of liabilities incurred do not anticipate significant changes in historical trends for these variables, any changes could have a considerable effect upon future claim costs and currently recorded liabilities and could materially impact our consolidated financial statements.

Item 1A—Risk Factors (Continued)

We could be subject to additional income tax liabilities.

We compute our income tax provision based on enacted tax rates in the countries in which we operate. As tax rates vary among countries, a change in earnings attributable to the various jurisdictions in which we operate could result in an unfavorable change in our overall tax provision. Additionally, changes in the enacted tax rates, adverse outcomes in tax audits, including transfer pricing disputes, or any change in the pronouncements relating to accounting for income taxes could have a material adverse effect on our financial condition and results of operations.

Significant changes in, or failure to comply with, federal, state, regional, local and international laws and regulations relating to the use, storage, discharge and disposal of hazardous materials, hazardous and non-hazardous wastes and other environmental matters could adversely impact our business, financial condition and results of operations.

We are subject to a wide variety of federal, state, regional, local and international laws and regulations relating to the use, storage, discharge and disposal of hazardous materials, hazardous and non-hazardous wastes and other environmental matters. Failure to comply with these laws could result in harm to our members, employees or others, significant costs to satisfy environmental compliance, remediation or compensatory requirements, or the imposition of severe penalties or restrictions on operations by governmental agencies or courts that could adversely affect our business, financial condition and results of operations.

We are involved in a number of legal proceedings and audits and some of these outcomes could adversely affect our business, financial condition and results of operations.

Our business requires compliance with many laws and regulations. Failure to achieve compliance could subject us to lawsuits and other proceedings, and lead to damage awards, fines, penalties, and remediation costs. We are, or may become involved, in a number of legal proceedings and audits including grand jury investigations, government and agency investigations, and consumer, employment, tort, unclaimed property laws, and other litigation. We cannot predict with certainty the outcomes of these proceedings and other contingencies, including environmental remediation and other proceedings commenced by governmental authorities. The outcome of some of these proceedings, audits, unclaimed property laws, and other contingencies could require us to take, or refrain from taking, actions which could negatively affect our operations or could require us to pay substantial amounts of money, adversely affecting our financial condition and results of operations. Additionally, defending against these lawsuits and proceedings may involve significant expense and diversion of management's attention and resources.