Our business is subject to various foreign and U.S. federal and state laws and regulations, including:including laws and regulations that govern the offer and sale of franchises, many of which impose substantive requirements on franchise agreementscontracts and require that certain materials be registered before franchises can be offered or sold in a particular state; and extensive state and federal laws and regulations relating to our timeshare business, primarily relating to the sale and marketing of timeshare intervals.jurisdiction.

In addition, a number of states regulate the activities of hospitality properties and restaurants, including safety and health standards, as well as the sale of liquor at such properties, by requiring licensing, registration, disclosure statements and compliance with specific standards of conduct. Operators of hospitality properties also are subject to laws governing their relationship with employees, including minimum wage requirements, overtime, working conditions and work permit requirements. Our franchisees are responsible for their own compliance with laws, including with respect to their employee,employees, minimum wage requirements, overtime, working conditions and work permit requirements. Compliance with, or changes in, these laws could reduce the revenue and profitability of our properties and could otherwise adversely affect our operations.

We also manage and own hotels with casino gaming operations as part of or adjacent to the hotels. However, with the exception of casinos at certain of our properties in Puerto Rico and one property in Egypt, third parties manage and operate the casinos. We hold and maintain the casino gaming license and manage the casinos located in Puerto Rico and Egypt and employ third-party compliance consultants and service providers. As a result, our business operations at these facilities are subject to the licensing and regulatory control of the local regulatory agency responsible for gaming licenses and operations in those jurisdictions.

Finally, as an international owner, operatormanager and franchisor of hospitality properties in 94105 countries and territories, we also are subject to the local laws and regulations in each country in which we operate, including employment laws and practices, privacy laws and tax laws, which may provide for tax rates that exceed those of the U.S. and which may provide that our foreign earnings are subject to withholding requirements or other restrictions, unexpected changes in regulatory requirements or monetary policy and other potentially adverse tax consequences.

We are subject to certain requirements and potential liabilities under various foreign and U.S. federal, state and local environmental, health and safety laws and regulations and incur costs in complying with such requirements. These laws and regulations govern actions including air emissions, the use, storage and disposal of hazardous and toxic substances, and wastewater disposal. In addition to investigation and remediation liabilities that could arise under such laws, we may also face personal injury, property damage, fines or other claims by third parties concerning environmental compliance or contamination. In addition to our hotel accommodations, we operate a number of laundry facilities located in certain areas where we have multiple properties. We use and store hazardous and toxic substances, such as cleaning materials, pool chemicals, heating oil and fuel for back-up generators at some of our facilities, and we generate certain wastes in connection with our operations. Some of our properties include older buildings, and some may have, or may historically have had, dry-cleaning facilities and underground storage tanks for heating oil and back-up generators. We have from time to time been responsible for investigating and remediating contamination at some of our facilities, such as contamination that has been discovered when we have removed underground storage tanks, and we could be held responsible for any contamination resulting from the disposal of wasteswaste that we generate, including at locations where such wastes havewaste has been sent for disposal. In some cases, we may be entitled to indemnification from the party that caused the contamination or pursuant to our management or franchise agreements,contracts, but there can be no assurance that we would be able to recover all or any costs we incur in addressing such problems. From time to time, we may also be required to manage, abate, remove or contain mold, lead, asbestos-containing materials, radon gas or other hazardous conditions found in or on our properties. We have implemented an on-going operations and maintenance plan at each of our owned and operatedmanaged properties that seeks to identify and remediate these conditions as appropriate. Although we have incurred, and expect that we will continue to incur, costs relating to the investigation, identification and remediation of hazardous materials known or discovered to exist at our properties, those costs have not had, and are not expected to have, a material adverse effect on our financial condition,position, results of operations or cash flow.

U.S. hotels that we manage are permitted to participate in certain of our insurance programs by mutual agreement with our hotel owners or, ifowners. If not participating in our programs, hotel owners must purchase insurance programs consistent with our requirements. U.S. franchised hotels are not permitted to participate in our insurance programs, but rather must purchase insurance programs consistent with our requirements. Non-U.S.Foreign managed and franchised hotels are required to participate in certain of our insurance programs. All other insurance programs purchased by hotel owners must meet our requirements. In addition, our management and franchise agreementscontracts typically include provisions requiring the owner of the hotel property to indemnify us against losses arising from the design, development and operation of hotels owned by such third parties.

Most of our insurance policies are written with self-insured retentions or deductibles that are common in the insurance market for similar risks, and we believe such risks are prudent for us to assume. Our third-party insurance policies provide coverage for claim amounts that exceed our self-insurance retentions or deductible obligations. We maintain insurance coverage for general liability, property including business interruption, terrorism and other risks with respect to our business for all of our owned and leased hotels, and we maintain workers' compensation coverage for all of our team members. In addition, through our captive insurance subsidiary, we participate in a reinsurance arrangement that provides coverage for a certain portion of our deductibles. In general, our insurance provides coverage related to any claims or losses arising out of the design, development and operation of our hotels.

Hilton Worldwide Holdings Inc. was incorporated in Delaware in March 2010. In 1919, our founder Conrad Hilton purchased his first hotel in Cisco, Texas. Through our predecessors, we commenced corporate operations in 1946 when our subsidiary Hilton Hotels Corporation, later renamed Hilton Worldwide, Inc., was incorporated in Delaware.1946.

We file annual, quarterly and current reports, proxy statements and other information with the U.S. Securities and Exchange Commission ("SEC"). Our SEC filings are available to the public over the internet at the SEC's website at http://www.sec.gov. Our SEC filings are also available on our website at http://www.hiltonworldwide.comnewsroom.hilton.com as soon as reasonably practicable after they are filed with or furnished to the SEC. You may also read and copy any filed document at the SEC's public reference room in Washington, D.C. at 100 F Street, N.E., Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 for further information about public reference rooms.

We maintain an internet site at http://www.hiltonworldwide.com.newsroom.hilton.com. Our website and the information contained on or connected to that site are not incorporated into this Annual Report on Form 10-K.

In addition to the other information in this Annual Report on Form 10-K, the following risk factors should be considered carefully in evaluating our company and our business.

Our business is subject to a number of business, financial and operating risks inherent to the hospitality industry, including:

Any of these factors could increase our costs or limit or reduce the prices we are able to charge for hospitality products and services, or otherwise affect our ability to maintain existing properties or develop new properties. As a result, any of these factors can reduce our revenues and limit opportunities for growth.

Macroeconomic and other factors beyond our control can reduce demand for hospitality products and services, including demand for rooms at properties that we manage, franchise, own, lease or develop, as well as demand for timeshare properties.our hotels. These factors include, but are not limited to:

Any one or more of these factors could limit or reduce overall demand for our products and services or could negatively affect our revenue sources, which could adversely affect our business, financial condition and results of operations.

Consumer demand for our services is closely linked to the performance of the general economy and is sensitive to business and personal discretionary spending levels. Decreased global or regional demand for hospitality products and services can be especially pronounced during periods of economic contraction or low levels of economic growth, and the recovery period in our industry may lag overall economic improvement. Declines in demand for our products and services due to general economic conditions could negatively affect our business by decreasing the revenues and profitability of our owned properties, limiting the amount of fee revenues we are able to generate from our managed and franchised properties and reducing overall demand for timeshare intervals.decreasing the revenues and profitability of our owned and leased properties. In addition, many of the expenses associated with our business, including personnel costs, interest, rent, property taxes, insurance and utilities, are relatively fixed. During a period of overall economic weakness, if we are unable to meaningfully decrease these costs as demand for our hotels and timeshare properties decreases, our business operations and financial performance may be adversely affected.

The hospitality industry is seasonal in nature. The periods during which our lodging properties experience higher revenues vary from property to property, depending principally upon location and the customer base served. We generally expect our revenues to be lower in the first quarter of each year than in each of the three subsequent quarters with the fourth quarter generally being the highest. In addition, the hospitality industry is cyclical and demand generally follows the general economy on a lagged basis. The seasonality and cyclicality of our industry may contribute to fluctuations in our results of operations and financial condition.

The segments of the hospitality industry in which we operate are subject to intense competition. Our principal competitors are other operators of luxury, full-servicefull service and focused-servicefocused service hotels, and timeshare properties, including other major hospitality chains with well-established and recognized brands. We also compete against smaller hotel chains, independent and local hotel owners and operators, home and independentapartment sharing services and timeshare operators. If we are unable to compete successfully, our revenues or profits may decline.

We face competition for individual guests, group reservations and conference business. We compete for these customers based primarily on brand name recognition and reputation, as well as location, room rates, property size and availability of rooms and conference space, quality of the accommodations, customer satisfaction, amenities and the ability to earn and redeem loyalty program points. Our competitors may have greater commercial, financial and marketing resources and more efficient technology platforms, which could allow them to improve their properties and expand and improve their marketing efforts in ways that could affect our ability to compete for guests effectively.effectively, or they could offer a type of lodging product that customers find attractive but that we do not offer.

We compete to enter into management and franchise agreements.contracts. Our ability to compete effectively is based primarily on the value and quality of our management services, brand name recognition and reputation, our ability and willingness to invest capital, availability of suitable properties in certain geographic areas, and the overall economic terms of our agreementscontracts and the economic advantages to the property owner of retaining our management services and using our brands. If the properties that we manage or franchise perform less successfully than those of our competitors, if we are unable to offer terms as favorable as those offered by our competitors, or if the availability of suitable properties is limited, our ability to compete effectively for new management or franchise agreementscontracts could be reduced.

Our brands and our reputation are among our most important assets. Our ability to attract and retain guests depends, in part, on the public recognition of our brands and their associated reputation. In addition, the success of our hotel owners’ businesses and their ability to make payments to us for our services may depend on the strength and reputation of our brands. If our brands become obsolete or consumers view them as unfashionable or lacking in consistency and quality, we may be unable to attract guests to our hotels, and may further be unable to attract or retain our hotel owners.

Changes in ownership or management practices, the occurrence of accidents or injuries, natural disasters, crime, individual guest notoriety or similar events at our managed, owned, leased or timeshare propertieshotels and resorts can harm our reputation, create adverse publicity and cause a loss of consumer confidence in our business. Because of the global nature of our brands and the broad expanse of our business and hotel locations, events occurring in one location could negatively affect the reputation and operations of otherwise successful individual locations. In addition, the recent expansion of social media has compounded the potential scope of negative publicity. We also could face legal claims related to negative events, along with resulting adverse publicity. IfA perceived decline in the perceived quality of our brands declines, or ifdamage to our reputation is damaged,could adversely affect our business, financial condition or results of operations could be adversely affected.operations.

Our management and franchise business depends on our ability to establish and maintain long-term, positive relationships with third-party property owners and our ability to enter into new and renew management and franchise agreements.contracts. Although our management and franchise contracts are typically long-term arrangements, hotel owners may be able to terminate the agreementscontracts under certain circumstances, including the failure to meet specified financial or performance criteria. Our ability to meet these financial and performance criteria is subject to, among other things, risks common to the overall hotel industry,

Growth of our management and franchise business is affected, and may potentially be limited, by factors influencing real estate development generally, including site availability, financing, planning, zoning and other local approvals. In addition, market factors such as projected room occupancy, changes in growth in demand compared to projected supply, geographic area restrictions in management and franchise agreements,contracts, costs of construction and anticipated room rate structure, if not managed effectively by our third-party owners could adversely affect the growth of our management and franchise business.

Many of our third-party property owners pledged their properties as collateral for mortgage loans entered into at the time of development, purchase or refinancing. If our third-party property owners are unable to repay or refinance maturing indebtedness on favorable terms or at all, their lenders could declare a default, accelerate the related debt and repossess the property. AWhile we maintain certain contractual protections, repossession could result in the termination of our management or franchise agreementcontract or eliminate revenues and cash flows from the property. In addition, the owners of managed and franchised hotels depend on financing to buy, develop and improve hotels and in some cases, fund operations during down cycles. Our hotel owners’ inability to obtain adequate funding could materially adversely affect the maintenance and improvement plans of existing hotels, as well as result in the delay or stoppage of the development of our existing pipeline.pipeline and limit additional development to further expand our hotel portfolio.

Substantially all of our management and franchise agreementscontracts, as well as our license agreement with HGV, require third-party property owners to comply with quality and reputation standards of our brands. This includesbrands, which include requirements related to the physical condition, safety standards and appearance of the properties as well as the service levels provided by hotel employees. These standards may evolve with customer preference, or we may introduce new requirements over time. If our property owners fail to make investments necessary to maintain or improve the properties in accordance with our standards, guest preference for our brands could diminish. In addition, if third-party property owners fail to observe standards or meet their contractual requirements, we may elect to exercise our termination rights, which would eliminate revenues from these properties and cause us to incur expenses related to terminating these contracts. We may be unable to find suitable or offsetting replacements for any terminated relationships.

Our management and franchise agreementscontracts require us and our hotel owners to comply with operational and performance conditions that are subject to interpretation and could result in disagreements. Any dispute with a hotelproperty owner could be very expensive for us, even if the outcome is ultimately in our favor. We cannot predict the outcome of any arbitration or litigation, the effect of any negative judgment against us or the amount of any settlement that we may enter into with any third party. Furthermore, specific to our industry, some courts have applied principles of agency law and related fiduciary standards to managers of third-party hotel properties, which means that property owners may assert the right to terminate agreementscontracts even where the agreementscontracts do not expressly provide for termination. Our fees from any terminated property would be eliminated, and accordingly may negatively affect our results of operations.

We own or lease a substantial amount ofOur investments in owned and leased real property which subjectssubject us to various risks that may not be applicable to managed or franchised properties, including:

The negative effect on profitability and cash flow from declines in revenues is more pronounced in owned or leased properties because we, as the owner or lessee, bear the risk of their high fixed-cost structure. Further, during times of economic distress, declining demand and declining earnings often result in declining asset values, and we may not be able to sell properties on favorable terms or at all. Accordingly, we may not be able to adjust our owned and leased property portfolio promptly in response to changes in economic or other conditions.

Certain of our owned and leased properties were constructed more than a centurymany years ago. The condition of aging properties could negatively affect our ability to attract guests or result in higher operating and capital costs, either of which could reduce revenues or profits from these properties. There can be no assurance that our planned replacements and repairs will occur, or even if completed, will result in improved performance. In addition, these efforts are subject to a number of risks, including:

If our properties are not updated to meet guest preferences, if properties under development or renovation are delayed in opening as scheduled, or if renovation investments adversely affect or fail to improve performance, our operations and financial results could be negatively affected.

Certain of our properties may qualify as legally-permissible nonconforming uses and improvements, including certain of our iconic and most profitable properties.improvements. If a substantial portion of any such property were to be destroyed by fire or other casualty, we might not be permitted to rebuild that property

In most cases, we are minority participants and do not control the decisions of the joint ventures in which we are involved. Therefore, joint venture investments may involve risks such as the possibility that a co-venturer in an investment might become bankrupt, be unable to meet its capital contribution obligations, have economic or business interests or goals that are inconsistent with our business interests or goals or take actions that are contrary to our instructions or to applicable laws and regulations. In addition, we may be unable to take action without the approval of our joint venture partners, or our joint venture partners could take actions binding on the joint venture without our consent. Consequently, actions by a co-venturer or other third-partythird party could expose us to claims for damages, financial penalties and reputational harm, any of which could adversely affect our business and operations. In addition, we may agree to guarantee indebtedness incurred by a joint venture or co-venturer or provide standard indemnifications to lenders for loss liability or damage occurring as a result of our actions or actions of the joint venture or other co-venturers. Such a guarantee or indemnity may be on a joint and several basis with a co-venturer, in which case we may be liable in the event that our co-venturer defaults on its guarantee obligation. The non-performance of a co-venturer's obligations may cause losses to us in excess of the capital we initially may have invested or committed.

We depend heavily upon our information technology systems in the conduct of our business. We own and license or otherwise contract for sophisticated technology and systems for property management, procurement, reservations and the operation of the Hilton HHonors customerHonors guest loyalty program. Such systems are subject to, among other things, damage or interruption from power outages, computer and telecommunications failures, computer viruses and natural and man-made disasters. Although we have a cold disaster recovery site in a separate location to back up our core reservation, distribution and financial systems, substantially all of our data center operations are currently located in a single facility. AnyAlthough we are migrating portions of our operations to cloud-based providers while simultaneously building and operating new applications and services with those cloud-based providers, any loss or damage to our primary facility could result in operational disruption and data loss as we movetransfer production operations to our disaster recovery site. Damage or interruption to our information systems may require a significant investment to update, remediate or replace with alternate systems, and we may suffer interruptions in our operations as a result. In addition, costs and potential

We rely on third parties for the performance of a significant portion of our information technology functions worldwide. In particular, our reservation system relies on data communications networks operated by unaffiliated third parties. The success of our business depends in part on maintaining our relationships with these third parties and their continuing ability to perform these functions and services in a timely and satisfactory manner. If we experience a loss or disruption in the provision of any of these functions or services, or they are not performed in a satisfactory manner, we may have difficulty in finding alternate providers on terms favorable to us, in a timely manner or at all, and our business could be adversely affected.

We rely on certain software vendors to maintain and periodically upgrade many of these systems so that they can continue to support our business. The software programs supporting many of our systems were licensed to us by independent software developers. The inability of these developers or us to continue to maintain and upgrade these information systems and software programs would disrupt or reduce the efficiency of our operations if we were unable to convert to alternate systems in an efficient and timely manner.

We are vulnerable to various risks and uncertainties associated with our websites and mobile applications, including changes in required technology interfaces, website and mobile application downtime and other technical failures, costs and issues as we upgrade our website software and mobile applications. Additional risks include computer viruses,malware, changes in applicable federal and state regulation, security breaches, legal claims related to our website operations and e-commerce fulfillment and other consumer privacy concerns. Our failure to successfully respond to these risks and uncertainties could reduce website and mobile application sales and have a material adverse effect on our business or results of operations.

From time to time we and third parties who serve usour third-party service providers experience cyber-attacks, attempted and actual breaches of our or their information technology systems and networks or similar events, which could result in a loss of sensitive business or customer information, systems interruption or the disruption of our operations. The techniques that are used to obtain unauthorized access, disable or degrade service or sabotage systems change frequently and are difficult to detect for long periods of time, and we are accordingly unable to anticipate and prevent all data security incidents. For example, in 2011In November 2015, we were notified by Epsilon, our database marketing vendor,announced that we were among a group of companies servedhad identified and taken action to eradicate unauthorized malware that targeted payment card information in some point-of-sale systems in our hotels and had determined that specific payment card information was targeted by Epsilon that were affected by a data breach that resulted in an unauthorized third party gaining access to Epsilon’s files that included names and e-mails of certain of our customers. Since this notificationmalware. We expect we have beenwill be subject to additional cyber-attacks in the future and may experience data breaches.

Even if we are fully compliant with legal standards and contractual or other requirements, we still may not be able to prevent security breaches involving sensitive data. The sophistication of efforts by hackers to gain unauthorized access to information systems has continued to increase in recent years. Breaches, thefts, losses or fraudulent uses of customer, employee or company data could cause consumers to lose confidence in the security of our websites, mobile applications, point of sale systems and other information technology systems and choose not to purchase from us. Such security breaches also could expose us to risks of data loss, business disruption, litigation and other liability,costs or liabilities, any of which could adversely affect our business.

We are subject to various risks and costs associated with the collection, handling, storage and transmission of sensitive information, including those related to compliance with U.S. and foreign data collection and privacy laws and other contractual obligations, as well as those associated with the compromise of our systems collecting such information. For example, the European Union's General Data Protection Regulation ("GDPR"), which becomes effective in May 2018 and replaces the current data protection laws of each EU member state, requires companies to meet new and more stringent requirements regarding the handling of personal data, and failure to meet the GDPR requirements could result in penalties of up to 4 percent of worldwide revenue. We collect internal and customer data, including credit card numbers and other personally identifiable information for a variety of important business purposes, including managing our workforce, providing requested products and services and maintaining guest preferences to enhance customer service and for marketing and promotion purposes. We could be exposed to fines, penalties, restrictions, litigation, reputational harm or other expenses, or other adverse effects on our business, due to failure to protect our guests' personal data and other sensitive information or failure to maintain compliance with the various U.S. and foreign data collection and privacy laws or with credit card industry standards or other applicable data security standards.

In addition, states and the federal government have recently enacted additional laws and regulations to protect consumers against identity theft. These laws and similar laws in other jurisdictions have increased the costs of doing business, and failure

We may consider strategic and complementary acquisitions of and investments in other hotel or hospitality brands, businesses, properties or other assets. Furthermore, we may pursue these opportunities in alliance with existing or prospective owners of managed or franchised properties. In many cases, we will be competing for these opportunities with third parties that may have substantially greater financial resources than us. Acquisitions or investments in brands, businesses, properties or assets as well as thesethird-party alliances are subject to risks that could affect our business, including risks related to:

We may not be able to identify opportunities or complete transactions on commercially reasonable terms or at all or we may not actually realize any anticipated benefits from such acquisitions, investments or alliances. Similarly, we may not be able to obtain financing for acquisitions or investments on attractive terms or at all, or the ability to obtain financing may be restricted by the terms of our indebtedness. In addition, the success of any acquisition or investment also will depend, in part, on our ability to integrate the acquisition or investment with our existing operations.

We also may also divest certain properties or assets, and any such divestments may yield lower than expected returns.returns or otherwise fail to achieve the benefits we expect. In some circumstances, sales of properties or other assets may result in losses. Upon sales of properties or assets, we may become subject to contractual indemnity obligations, incur material tax liabilities or, as a result of required debt repayment, face a shortage of liquidity. Finally, any acquisitions, investments or dispositions could demand significant attention from management that would otherwise be available for business operations, which could harm our business.

We rely on a variety of direct marketing techniques, including telemarketing, email and social media marketing and postal mailings, and we are subject to various laws and regulations in the U.S. and internationally that govern marketing and advertising practices. Any further restrictions in laws and court or agency interpretation of such laws, such as the Telephone Consumer Protection Act of 1991, the Telemarketing Sales Rule, CAN-SPAM Act of 2003, and various U.S. state laws, new laws, or international data protection laws, such as the EU member states’ implementation of proposed privacy regulation,GDPR, that govern these activities could adversely affect current or planned marketing activities and cause us to change our marketing strategy. If this occurs, we may not be able to develop adequate alternative marketing strategies, which could affect our ability to maintain relationships with our customers and acquire new customers. We also obtain access to names of potential customers from travel service providers or other companies and we market to some individuals on these lists directly or through other companies’ marketing materials. If access to these lists were prohibited or otherwise restricted, our ability to develop new customers and introduce them to products could be impaired.

A significant percentage of hotel rooms for individual guests are booked through internet travel intermediaries, to whom we commit to pay various commissions and transaction fees for sales of our rooms through their systems. Search engines and peer-to-peer inventory sources also provide online travel services that compete with our business. If these bookings increase, thesecertain hospitality intermediaries may be able to obtain higher commissions, reduced room rates or other significant concessions from us or our franchisees. These hospitality intermediaries also may reduce these bookings by de-ranking our hotels in search results on their platforms, and other online providers may divert business away from our hotels. Although our agreementscontracts with many of thesehospitality intermediaries limit transaction fees for hotels, there can be no assurance that we will be able to

In addition, although internet travel intermediaries have traditionally competed to attract individual leisure consumers or "transient" business rather than group"group" business for meetings and convention business,events, in recent years they have recently expanded their business to include marketing to large group business and conventionalso to corporate transient business. If that growth continues, it could both divert group and conventioncorporate transient business away from our hotels and also increase our cost of sales for group and conventioncorporate transient business. Consolidation of internet travel intermediaries, andor the entry of major internet companies into the internet travel bookings business, also could divert bookings away from our websites and increase our hotels' cost of sales.

We manage a global reservation system that communicates reservations to our branded hotels when made by individuals directly, either online, or by telephone to our call centers, through devices via our mobile application, or through intermediaries like travel agents, internet travel web sites and other distribution channels. The cost, speed, efficacy and efficiency of the reservation system are important aspects of our business and are important considerations of hotel owners in choosing to affiliate with our brands. Any failure to maintain or upgrade, and any other disruption to our reservation system may adversely affect our business.

We manage the Hilton HHonorsHonors guest loyalty and rewards program for the Hilton brands. Program members accumulate points based on eligible stays and hotel charges and redeem the points for a range of benefits including free rooms and other items of value. The program is an important aspect of our business and of the affiliation value for hotel owners under management and franchise agreements.contracts. System hotels (including, without limitation, third-party hotels under management and franchise arrangements) contribute a percentage of the guest’sloyalty member's charges to the program for each stay of a program member. In addition to the accumulation of points for future hotels stays at our brands, Hilton HHonorsHonors arranges with third-party service providers,third parties, such as airlines, other transportation services, online vendors, retailers and railcredit card companies, to exchange monetary value represented bysell Honors points for program awards.the use of their customers and/or to allow Honors members to use or exchange points for products or services. Currently, the program benefits are not taxed as income to members. If the program awards and benefits are materially altered, curtailed or taxed such that a material number of Hilton HHonorsHonors members choose to no longer participate in the program, this could adversely affect our business.

We currently manage, franchise, own or lease hotels and resorts in 94105 countries and territories around the world. Our operations outside the United States represented approximately 2523 percent, 28 percent and 31 percent of our revenues for each of the years ended December 31, 20142017, 2016 and 2013.2015, respectively. We expect that revenues from our international operations will continue to account for an increasinga material portion of our total revenues. As a result, we are subject to the risks of doing business outside the United States, including:

These factors may adversely affect the revenues earned from and the market value of our properties that we own or lease located in international markets. While these factors and the effect of these factors are difficult to predict, any one or more of them could lower our revenues, increase our costs, reduce our profits or disrupt our business operations.

Our business operations in countries outside the U.S. are subject to a number of laws and regulations, including restrictions imposed by the Foreign Corrupt Practices Act ("FCPA"),FCPA, as well as trade sanctions administered by the Office of Foreign Assets Control ("OFAC").OFAC. The FCPA is intended to prohibit bribery of foreign officials and requires us to keep books and records that accurately and fairly reflect our transactions. OFAC administers and enforces economic and trade sanctions based on U.S. foreign policy and national security goals against targeted foreign states, organizations and individuals. Although we have policies in place designed to comply with applicable sanctions, rules and regulations, it is possible that hotels we ownmanage or manageown in the countries and territories in which we operate may provide services to or receive funds from persons subject to sanctions. Where we have identified potential violations in the past, we have taken appropriate remedial action including filing voluntary disclosures to OFAC. In addition, some of our operations may be subject to the laws and regulations of non-U.S. jurisdictions, including the U.K.’s Bribery Act 2010, which contains significant prohibitions on bribery and other corrupt business activities, and other local anti-corruption laws in the countries and territories in which we conduct operations.

If we fail to comply with these laws and regulations, we could be exposed to claims for damages, financial penalties, reputational harm and incarceration of employees or restrictions on our operation or ownership of hotels and other properties, including the termination of management, franchising and ownership rights. In addition, in certain circumstances, the actions of parties affiliated with us (including our owners, joint venture partners, employees and agents) may expose us to liability under the FCPA, U.S. sanctions or other laws. These restrictions could increase costs of operations, reduce profits or cause us to forgo development opportunities that would otherwise support growth.

In August 2012, Congress enacted the Iran Threat Reduction and Syria Human Rights Act of 2012 ("ITRSHRA"), which expands the scope of U.S. sanctions against Iran and Syria. In particular, Section 219 of the ITRSHRA amended the Exchange Act to require SEC-reporting companies to disclose in their periodic reports specified dealings or transactions involving Iran or other individuals and entities targeted by certain OFAC sanctions engaged in by the reporting company or any of its affiliates. These companies are required to separately file with the SEC a notice that such activities have been disclosed in the relevant periodic report, and the SEC is required to post this notice of disclosure on its website and send the report to the U.S. President and certain U.S. Congressional committees. The U.S. President thereafter is required to initiate an investigation and, within 180 days of initiating such an investigation with respect to certain disclosed activities, to determine whether sanctions should be imposed.

Under ITRSHRA, we are required to report if we or any of our "affiliates" knowingly engaged in certain specified activities during a period covered by one of our Annual Reports on Form 10-K or Quarterly Reports on Form 10-Q. We have engaged in, and may in the future engage in, activities that would require disclosure pursuant to Section 219 of ITRSHRA. In addition, because the SEC defines the term "affiliate" broadly, we may be deemed to be a controlledan affiliate of HNA or HNA's affiliates or Blackstone affiliates of Blackstone may also be considered ouror Blackstone's affiliates. Other affiliates of HNA or Blackstone have in the past andor may in the future be required to make disclosures pursuant to ITRSHRA, including the activities discussed in the disclosures included on Exhibit 99.1 to this Annual Report on Form 10-K, which disclosures are hereby incorporated by reference herein.ITRSHRA. Disclosure of such activities, even if such activities are permissible under applicable law, and any sanctions imposed on us or our affiliates as a result of these activities could harm our reputation and brands and have a negative effect on our results of operations.

Our ability to maintain our competitive position depends somewhat on the efforts and abilities of our senior executives. Finding suitable replacements for senior executives could be difficult. Losing the services of one or more of these senior executives could adversely affect strategic relationships, including relationships with third-party property owners, significant customers, joint venture partners and vendors, and limit our ability to execute our business strategies.

We also rely on the general managers at each of our managed, owned and leased hotels to manage daily operations and oversee the efforts of employees. These general managers are trained professionals in the hospitality industry and have extensive experience in many markets worldwide. The failure to retain, train or successfully manage general managers for our managed, owned and leased hotels could negatively affect our operations.

Our success depends in large part on our ability to attract, retain, train, manage and engage employees. We employ or manage approximately 157,000more than 163,000 individuals at our managed, owned and leased hotels and corporate offices around the world. If we are unable to attract, retain, train, manage and engage skilled individuals, our ability to staff and manage the hotels that we manage, own and staff the managed, owned and leased hotelslease could be impaired, which could reduce customer satisfaction. In addition, the inability of our franchisees to attract, retain, train, manage and engage skilled employees for the franchised hotels could adversely affect the reputation of our brands. Staffing shortages in various parts of the world also could hinder our ability to grow and expand our businesses. Because payroll costs are a major component of the operating expenses at our hotels and our franchised hotels, a shortage of skilled labor could also require higher wages that would increase labor costs, which could adversely affect our results of operations. Additionally, increase in minimum wage rates could increase costs and reduce profits for us and our franchisees.

The recognition and reputation of our brands are important to our success. We have over 4,900nearly 5,900 trademark registrations in jurisdictions around the world for use in connection with our services, plus at any given time, a number of pending applications for trademarks and other intellectual property. However, those trademark or other intellectual property registrations may not be granted or the steps we take to use, control or protect our trademarks or other intellectual property in the U.S. and other jurisdictions may not always be adequate to prevent third parties from copying or using the trademarks or other intellectual property without authorization. We may also fail to obtain and maintain trademark protection for all of our brands in all jurisdictions. For example, in certain jurisdictions, third parties have registered or otherwise have the right to use certain trademarks that are the same as or similar to our trademarks, which could prevent us from registering trademarks and opening hotels in that jurisdiction. Third parties may also challenge our rights to certain trademarks or oppose our trademark applications. Defending against any such proceedings may be costly, and if unsuccessful, could result in the loss of important intellectual property rights. Obtaining and maintaining trademark protection for multiple brands in multiple jurisdictions is also expensive, and we may therefore elect not to apply for or to maintain certain trademarks.

Our intellectual property is also vulnerable to unauthorized copying or use in some jurisdictions outside the U.S., where local law, or lax enforcement of law, may not provide adequate protection. If our trademarks or other intellectual property are improperly used, the value and reputation of the Hilton brands could be harmed. There are times where we may need to resort to litigation to enforce our intellectual property rights. Litigation of this type could be costly, force us to divert our resources, lead to counterclaims or other claims against us or otherwise harm our business or reputation. In addition, we license certain of our trademarks to third parties. For example, we have granted HGV the right to use certain of our marks and intellectual property in its timeshare business and we grant our franchisees a right to use certain of our trademarks in connection with their operation of the applicable property. If HGV, a franchisee or other licensee fails to maintain the quality of the goods and services used in connection with the licensed trademarks, our rights to, and the value of, our trademarks could potentially be harmed. Failure to maintain, control and protect our trademarks and other intellectual property could likely adversely affect our ability to attract guests or third-party owners, and could adversely affect our results.

In addition, we license the right to use certain intellectual property from unaffiliated third parties, including the right to grant sublicenses to franchisees. If we are unable to use this intellectual property, our ability to generate revenue from such properties may be diminished.

Third parties may make claims against us for infringing their patent, trademark, copyright or other intellectual property rights or for misappropriating their trade secrets. We have been and are currently party to a number of such claims and may receive additional claims in the future. Any such claims, even those without merit, could:

Conducting business in currencies other than the U.S. dollar subjects us to fluctuations in currency exchange rates that could have a negative effect on our financial results. We earn revenues and incur expenses in foreign currencies as part of our operations outside of the U.S. As a result, fluctuations in currency exchange rates may significantly increase the amount of U.S. dollars required for foreign currency expenses or significantly decrease the U.S. dollars received from foreign currency revenues. We also have exposure to currency translation risk because, generally, the results of our business outside of the U.S. are reported in local currency and then translated to U.S. dollars for inclusion in our consolidated financial statements. As a result, changes between the foreign exchange rates and the U.S. dollar will affect the recorded amounts of our foreign assets, liabilities, revenues and expenses and could have a negative effect on our financial results. Our exposure to foreign currency exchange rate fluctuations will grow if the relative contribution of our operations outside the U.S. increases.

To attempt to mitigate foreign currency exposure, we may enter into foreign exchange hedging agreements with financial institutions. However, these hedging agreements may not eliminate foreign currency risk entirely and involve costs and risks of their own in the form of transaction costs, credit requirements and counterparty risk.

We operate in certain areas where the risk of natural disaster or other catastrophic losses vary,exists, and the occasional incidence of such an event could cause substantial damage to us, our owners or the surrounding area. We carry, andand/or we require our owners to carry, insurance from solvent insurance carriers that we believe is adequate for foreseeable first- and third-party losses and with terms and conditions that are reasonable and customary. Nevertheless, market forces beyond our control could limit the scope of the insurance coverage that we and our owners can obtain or may otherwise restrict our or our owners’ ability to buy insurance coverage at reasonable rates.rates such as those natural disasters that occurred in 2017. We anticipate increased costs of property insurance across the portfolio in 2018 due to the significant losses that insurers suffered globally in 2017. In the event of a substantial loss, the insurance coverage that we and/or our owners carry may not be sufficient to pay the full value of our financial obligations, our liabilities or the replacement cost of any lost investment or property. Because certain types of losses are uncertain, they may be uninsurable or prohibitively expensive. In addition, there are other risks that may fall outside the general coverage terms and limits of our policies.

In some cases, these factors could result in certain losses being completely uninsured. As a result, we could lose some or all of the capital we have invested in a property, as well as the anticipated future revenues, profits, management fees or franchise fees from the property.

The terrorist attacks on the World Trade Center and the Pentagon on September 11, 2001 underscore the possibility that large public facilities or economically important assets could become the target of terrorist attacks in the future. In particular, properties that are well-known or are located in concentrated business sectors in major cities where our hotels are located may be subject to the risk of terrorist attacks.

The occurrence or the possibility of terrorist attacks or military conflicts could:

The occurrence of a terrorist attack with respect to one of our properties could directly and materially adversely affect our results of operations. Furthermore, the loss of any of our well-known buildings could indirectly affect the value of our brands, which would in turn adversely affect our business prospects.

We are subject to taxation at the federal, state or provincial and local levels in the U.S. and various other countries and jurisdictions. Our future effective tax rate could be affected by changes in the composition of earnings in jurisdictions with differing tax rates, changes in statutory rates and other legislative changes, changes in the valuation of our deferred tax assets and liabilities, or changes in determinations regarding the jurisdictions in which we are subject to tax. From time to time, the U.S. federal, state and local and foreign governments make substantive changes to tax rules and their application, which could result in materially higher corporate taxes than would be incurred under existing tax law and could adversely affect our financial condition or results of operations.

We are subject to ongoing and periodic tax audits and disputes in U.S. federal and various state, local and foreign jurisdictions. In particular, our consolidated U.S. federal income tax returns for the fiscal years ended December 31, 2006 and October 24, 20072005 through December 31, 2013 are under audit by the Internal Revenue Service ("IRS"), and the IRS has proposed adjustments to increase our taxable income based on several assertions involving intercompany loans, our Hilton HHonorsHonors guest loyalty and reward program and our foreign-currency denominated loans issued by one of our subsidiaries. In total, the proposed adjustments sought by the IRS would result in U.S. federal tax owed of approximately $696$874 million, excluding interest and penalties and potential state income taxes. We disagree with the IRS’s position on each of the assertions and intend to vigorously contest them. Additionally, during 2014, the IRS commenced its audit of tax years December 2007 through 2010. See Note 19:14: "Income Taxes" in our audited consolidated financial statements included elsewhere in this Annual Report on Form 10-K for additional information. An unfavorable outcome from any tax audit could result in higher tax costs, penalties and interest, thereby adversely affecting our financial condition or results of operations.

New accounting rules or regulations and varying interpretations of existing accounting rules or regulations have occurred and may occur in the future. A change in accounting rules or regulations may require retrospective application and affect our reporting of transactions completed before the change is effective, and future changes to accounting rules or regulations or the questioning of current accounting practices may adversely affect our reported financial condition and results of operations. See Note 2: "Basis of Presentation and Summary of Significant Accounting Policies" in our audited consolidated financial statements included elsewhere in this Annual Report on Form 10-K for a summary of accounting standards issued but not yet adopted. Additionally, in 2013, the Financial Accounting Standards Board ("FASB"), issued a revised exposure draft outlining proposed

Our total assets include goodwill, intangible assets with indefinite lives, other intangible assets with finite useful lives and substantial amounts of long-lived assets, principally property and equipment, including hotel properties. We evaluate our goodwill and intangible assets with indefinite lives for impairment on an annual basis or at other times during the year if events or circumstances indicate that it is more likely than not that the fair value is below the carrying value. We evaluate our intangible assets with finite useful lives and long-lived assets for impairment when circumstances indicate that the carrying

In many jurisdictions, the hotel industry is subject to extensive foreign or U.S. federal, state and local governmental regulations, including those relating to the service of alcoholic beverages, the preparation and sale of food and those relating to building and zoning requirements. We are also subject to licensing and regulation by foreign or U.S. state and local departments relating to health, sanitation, fire and safety standards, and to laws governing our relationships with employees, including minimum wage requirements, overtime, working conditions status and citizenship requirements. In addition, the National Labor Relations Board may revisehas revised its standard for joint employee relationships, which could increase our risk of being considered a joint employer with our franchisees. We or our third-party owners may be required to expend funds to meet foreign or U.S. federal, state and local regulations in connection with the continued operation or remodeling of certain of our properties. The failure to meet the requirements of applicable regulations and licensing requirements, or publicity resulting from actual or alleged failures, could have an adverse effect on our results of operations.

We are subject to certain compliance costs and potential liabilities under various foreign and U.S. federal, state and local environmental, health and safety laws and regulations. These laws and regulations govern actions including air emissions, the use, storage and disposal of hazardous and toxic substances, and wastewater disposal. Our failure to comply with such laws, including any required permits or licenses, could result in substantial fines or possible revocation of our authority to conduct some of our operations. We could also be liable under such laws for the costs of investigation, removal or remediation of hazardous or toxic substances at our currently or formerly owned, leased or operated real property (including managed and franchised properties) or at third-party locations in connection with our waste disposal operations, regardless of whether or not we knew of, or caused, the presence or release of such substances. From time to time, we may be required to remediate such substances or remove, abate or manage asbestos, mold, radon gas, lead or other hazardous conditions at our properties. The presence or release of such toxic or hazardous substances could result in third-party claims for personal injury, property or natural resource damages, business interruption or other losses. Such claims and the need to investigate, remediate or otherwise address hazardous, toxic or unsafe conditions could adversely affect our operations, the value of any affected real property, or our ability to sell, lease or assign our rights in any such property, or could otherwise harm our business or reputation. Environmental, health and safety requirements have also become increasingly stringent, and our costs may increase as a result. New or revised laws and regulations or new interpretations of existing laws and regulations, such as those related to climate change, could affect the operation of our properties or result in significant additional expense and operating restrictions on us.