Item 1A. Risk Factors

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.

Risks Related to Our Business and Industry

We are subject to the business, financial and operating risks inherent to the hospitality industry, any of which could reduce our revenues and limit opportunities for growth.

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

•	significant competition from multiple hospitality providers in all parts of the world;

•	changes in operating costs, including employee compensation and benefits, energy, insurance and food;

•	increases in costs due to inflation or other factors that may not be fully offset by price and fee increases in our business;

•	changes in taxes and governmental regulations that influence or set wages, prices, interest rates or construction and maintenance procedures and costs;

•	the costs and administrative burdens associated with complying with applicable laws and regulations;

•	the costs or desirability of complying with local practices and customs;

•	significant increases in cost for health care coverage for employees and potential government regulation with respect to health care coverage;

•	shortages of labor or labor disruptions;

•	the ability of third-party internet and other travel intermediaries to attract and retain customers;

•	the quality of services provided by franchisees;

•	the availability and cost of capital necessary for us and third-party hotel owners to fund investments, capital expenditures and service debt obligations;

•	delays in or cancellations of planned or future development or refurbishment projects;

•	the financial condition of third-party property owners, developers and joint venture partners;

•	relationships with third-party property owners, developers and joint venture partners, including the risk that owners may terminate our management, franchise or joint venture contracts;

•	cyclical over-building in the hotel industry;

•	changes in desirability of geographic regions of the hotels in our business, geographic concentration of our operations and customers and shortages of desirable locations for development;

•	changes in the supply and demand for hotel services, including rooms, food and beverage and other products and services; and

•	decreases in the frequency of business travel that may result from alternatives to in-person meetings, including virtual meetings hosted online or over private teleconferencing networks.

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 adversely affect and reduce demand for our products and services.

Macroeconomic and other factors beyond our control can reduce demand for hospitality products and services, including demand for rooms at our hotels. These factors include, but are not limited to:

•	changes in general economic conditions, including low consumer confidence, unemployment levels and depressed real estate prices resulting from the severity and duration of any downturn in the U.S. or global economy;

•	governmental action and uncertainty resulting from U.S. and global political trends and policies, including potential barriers to travel, trade and immigration;

•	war, political instability or civil unrest, terrorist activities or threats and heightened travel security measures instituted in response to these events;

•	decreased corporate or government travel-related budgets and spending, as well as cancellations, deferrals or renegotiations of group business such as industry conventions;

•	statements, actions, or interventions by governmental officials related to travel and corporate travel-related activities and the resulting negative public perception of such travel and activities;

•	the financial and general business condition of the airline, automotive and other transportation-related industries and its effect on travel, including decreased airline capacity and routes;

•	conditions that negatively shape public perception of travel, including travel-related accidents and outbreaks of pandemic or contagious diseases, such as Ebola, Zika, avian flu, severe acute respiratory syndrome (SARS), H1N1 (swine flu) and Middle East Respiratory Syndrome (MERS);

•	cyber-attacks;

•	climate change or availability of natural resources;

•	natural or man-made disasters, such as earthquakes, tsunamis, tornadoes, hurricanes (e.g., hurricanes Harvey, Irma and Maria in 2017), typhoons, floods, wildfires, volcanic eruptions, oil spills and nuclear incidents;

•	changes in the desirability of particular locations or travel patterns of customers; and

•	organized labor activities, which could cause a diversion of business from hotels involved in labor negotiations and loss of business for our hotels generally as a result of certain labor tactics.

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.

Contraction in the global economy or low levels of economic growth could adversely affect our revenues and profitability as well as limit or slow our future growth.

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 limiting the amount of fee revenues we are able to generate from our managed and franchised properties and 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 decreases, our business operations and financial performance may be adversely affected.

The hospitality industry is subject to seasonal and cyclical volatility, which may contribute to fluctuations in our results of operations and financial condition.

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.

Because we operate in a highly competitive industry, our revenues or profits could be harmed if we are unable to compete effectively.

The segments of the hospitality industry in which we operate are subject to intense competition. Our principal competitors are other operators of luxury, full service and focused service hotels, 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 apartment sharing services and timeshare operators. If we are unable to compete successfully, our revenues or profits may decline.

Competition for hotel guests

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, or they could offer a type of lodging product that customers find attractive but that we do not offer.

Competition for management and franchise contracts

We compete to enter into management and franchise 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 contracts 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 contracts could be reduced.

Any deterioration in the quality or reputation of our brands could have an adverse effect on our reputation, business, financial condition or results of operations.

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 hotels 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 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. A perceived decline in the quality of our brands or damage to our reputation could adversely affect our business, financial condition or results of operations.

Our business is subject to risks related to doing business with third-party property owners that could adversely affect our reputation, operational results or prospects for growth.

Unless we maintain good relationships with third-party hotel owners and renew or enter into new management and franchise contracts, we may be unable to expand our presence and our business, financial condition and results of operations may suffer.

Our 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 contracts. Although our management and franchise contracts are typically long-term arrangements, hotel owners may be able to terminate the contracts 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, including factors outside of our control. In addition, negative management and franchise pricing trends could adversely affect our ability to negotiate with hotel owners. If we fail to maintain and renew existing management and franchise contracts or enter into new contracts on favorable terms, we may be unable to expand our presence and our business, and our financial condition and results of operations may suffer.

Our business is subject to real estate investment risks for third-party owners that could adversely affect our operational results and our prospects for growth.

Growth of our 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 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.

If our third-party property owners are unable to repay or refinance loans secured by the mortgaged properties, or to obtain financing adequate to fund current operations or growth plans, our revenues, profits and capital resources could be reduced and our business could be harmed.

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. While we maintain certain contractual protections, repossession could result in the termination of our management or franchise contract 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, result in the delay or stoppage of the development of our existing pipeline and limit additional development to further expand our hotel portfolio.

If our third-party property owners fail to make investments necessary to maintain or improve their properties, guest preference for Hilton brands and reputation and performance results could suffer.

Substantially all of our management and franchise contracts, as well as our license agreement with HGV, require third-party property owners to comply with quality and reputation standards of our brands, 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.

Contractual and other disagreements with third-party property owners could make us liable to them or result in litigation costs or other expenses.

Our management and franchise contracts 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 property 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 contracts even where the contracts do not expressly provide for termination. Our fees from any terminated property would be eliminated, and accordingly may negatively affect our results of operations.

Some of our existing development pipeline may not be developed into new hotels, which could materially adversely affect our growth prospects.

As of December 31, 2017, we had a total of 2,257 hotels in our development pipeline, which we define as hotels under construction or approved for development under one of our brands. The commitments of owners and developers with whom we have contracts are subject to numerous conditions, and the eventual development and construction of our pipeline not currently under construction is subject to numerous risks, including, in certain cases, the owner's or developer's ability to obtain adequate financing and obtaining governmental or regulatory approvals. As a result, not every hotel in our development pipeline may develop into a new hotel that enters our system.

New hotel brands or non-hotel branded concepts that we launch in the future may not be as successful as we anticipate, which could have a material adverse effect on our business, financial condition or results of operations.

Since 2011, we have opened hotels under five new brands: Home2 Suites by Hilton; Curio - A Collection by Hilton; Canopy by Hilton; Tru by Hilton; and, most recently, Tapestry Collection by Hilton. We may continue to build our portfolio by launching new hotel and non-hotel brands in the future. In addition, the Hilton Garden Inn, DoubleTree by Hilton and Hampton by Hilton brands have been expanding into new jurisdictions outside the United States over the past several years. We may continue to expand existing brands into new international markets. New hotel products or concepts or brand expansions may not be accepted by hotel owners, franchisees or customers and we cannot guarantee the level of acceptance any new brand will have in the development and consumer marketplaces. If new branded hotel products, non-hotel branded concepts or brand expansions are not as successful as we anticipate, we may not recover the costs we incurred in their development or expansion, which could have a material adverse effect on our business, financial condition or results of operations.

The risks resulting from investments in owned and leased real estate could increase our costs, reduce our profits and limit our ability to respond to market conditions.

Our investments in owned and leased real property subject us to various risks that may not be applicable to managed or franchised properties, including:

•	governmental regulations relating to real estate ownership or operations, including tax, environmental, zoning and eminent domain laws;

•	loss in value of real estate due to changes in market conditions or the area in which real estate is located;

•	fluctuations in real estate values or potential impairments in the value of our assets;

•	increased potential civil liability for accidents or other occurrences on owned or leased properties;

•	the ongoing need for capital improvements and expenditures funded by us to maintain or upgrade properties and contractual requirements to deliver properties back to landlords in a particular state of repair and condition at the end of a lease term;

•	periodic total or partial closures due to renovations and facility improvements;

•	risks associated with any mortgage debt, including the possibility of default, fluctuating interest rate levels and uncertainties in the availability of replacement financing;

•	contingent liabilities that exist after we have exited a property;

•	costs linked to the employment and management of staff to run and operate an owned or leased property; and

•	the relative illiquidity of real estate compared to some other assets.

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.

Our efforts to develop, redevelop or renovate our owned and leased properties could be delayed or become more expensive.

Certain of our owned and leased properties were constructed many 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:

•	construction delays or cost overruns (including labor and materials);

•	obtaining zoning, occupancy and other required permits or authorizations;

•	changes in economic conditions that may result in weakened or lack of demand for improvements that we make or negative project returns;

•	governmental restrictions on the size or kind of development;

•	volatility in the debt and capital markets that may limit our ability to raise capital for projects or improvements;

•	lack of availability of rooms or meeting spaces for revenue-generating activities during construction, modernization or renovation projects;

•	force majeure events, including earthquakes, tornadoes, hurricanes, floods or tsunamis, or acts of terrorism; and

•	design defects that could increase costs.

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.

Our properties may not be permitted to be rebuilt if destroyed.

Certain of our properties may qualify as legally-permissible nonconforming uses and 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

as it now exists, regardless of the availability of insurance proceeds. Any loss of this nature, whether insured or not, could materially adversely affect our results of operations and prospects.

We have investments in joint venture projects, which limits our ability to manage third-party risks associated with these projects.

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 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.

Although our joint ventures may generate positive cash flow, in some cases they may be unable to distribute that cash to the joint venture partners. Additionally, in some cases our joint venture partners control distributions and may choose to leave capital in the joint venture rather than distribute it. Because our ability to generate liquidity from our joint ventures depends in part on their ability to distribute capital to us, our failure to receive distributions from our joint venture partners could reduce our cash flow return on these investments.

Failures in, material damage to, or interruptions in our information technology systems, software or websites and difficulties in updating our existing software or developing or implementing new software could have a material adverse effect on our business or results of operations.

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 Honors 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. Although 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 transfer 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 problems and interruptions associated with the implementation of new or upgraded systems and technology or with maintenance or adequate support of existing systems could also disrupt or reduce the efficiency of our operations. Any material interruptions or failures in our systems, including those that may result from our failure to adequately develop, implement and maintain a robust disaster recovery plan and backup systems could severely affect our ability to conduct normal business operations and, as a result, have a material adverse effect on our business operations and financial performance.

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 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.

Cyber-attacks could have a disruptive effect on our business.

From time to time we and our 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. In November 2015, we announced that we had 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 this malware. We expect we will 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 costs or liabilities, any of which could adversely affect our business.

We are exposed to risks and costs associated with protecting the integrity and security of our guests’ personal data and other sensitive information.

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 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 on our part to implement appropriate safeguards or to detect and provide prompt notice of unauthorized access as required by some of these laws could subject us to potential claims for damages and other remedies. If we were required to pay any significant amounts in satisfaction of claims under these laws, or if we were forced to cease our business operations for any length of time as a result of our inability to comply fully with any such law, our business, operating results and financial condition could be adversely affected.

Failure to keep pace with developments in technology could adversely affect our operations or competitive position.

The hospitality industry demands the use of sophisticated technology and systems for property management, brand assurance and compliance, procurement, reservation systems, operation of our guest loyalty programs, distribution of hotel resources to current and future customers and guest amenities. These technologies may require refinements and upgrades. The development and maintenance of these technologies may require significant investment by us. As various systems and technologies become outdated or new technology is required, we may not be able to replace or introduce them as quickly as

needed or in a cost-effective and timely manner. We may not achieve the benefits we may have been anticipating from any new technology or system.

We may seek to expand through acquisitions of and investments in other businesses and properties, or through alliances, and we may also seek to divest some of our properties and other assets. These acquisition and disposition activities may be unsuccessful or divert management’s attention.

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 third-party alliances are subject to risks that could affect our business, including risks related to:

•	issuing shares of stock that could dilute the interests of our existing stockholders;

•	spending cash and incurring debt;

•	assuming contingent liabilities; or

•	creating additional expenses.

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 divest certain properties or assets, and any such divestments may yield lower than expected 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.

Failure to comply with marketing and advertising laws, including with regard to direct marketing, could result in fines or place restrictions on 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 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.

The growth of internet reservation channels could adversely affect our business and profitability.

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, certain 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 contracts with many hospitality intermediaries limit transaction fees for hotels, there can be no assurance that we will be able to

renegotiate these contracts upon their expiration with terms as favorable as the provisions that existed before the expiration, replacement or renegotiation. Moreover, hospitality intermediaries generally employ aggressive marketing strategies, including expending significant resources for online and television advertising campaigns to drive consumers to their websites. As a result, consumers may develop brand loyalties to the intermediaries’ offered brands, websites and reservations systems rather than to the Hilton brands and systems. If this happens, our business and profitability may be significantly affected as shifting customer loyalties divert bookings away from our websites, which increases costs to hotels in our system. Internet travel intermediaries also have been subject to regulatory scrutiny, particularly in Europe. The outcome of this regulatory activity may affect our ability to compete for direct bookings through our own internet channels.

In addition, although internet travel intermediaries have traditionally competed to attract individual leisure consumers or "transient" business rather than "group" business for meetings and events, in recent years they have expanded their business to include marketing to group business and also to corporate transient business. If that growth continues, it could both divert group and corporate transient business away from our hotels and also increase our cost of sales for group and corporate transient business. Consolidation of internet travel intermediaries, or 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.

Our reservation system is an important component of our business operations and a disruption to its functioning could have an adverse effect on our performance and results.

We manage a global reservation system that communicates reservations to our branded hotels when made by individuals directly, either online, 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.

The cessation, reduction or taxation of program benefits of our Hilton Honors loyalty program could adversely affect the Hilton brands and guest loyalty.

We manage the Hilton Honors guest loyalty 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 contracts. System hotels (including, without limitation, third-party hotels under management and franchise arrangements) contribute a percentage of the loyalty 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 Honors arranges with third parties, such as airlines, other transportation services, online vendors, retailers and credit card companies, to sell Honors points for 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 Honors members choose to no longer participate in the program, this could adversely affect our business.

Because we derive a portion of our revenues from operations outside the United States, the risks of doing business internationally could lower our revenues, increase our costs, reduce our profits or disrupt our business.

We currently manage, franchise, own or lease hotels and resorts in 105 countries and territories around the world. Our operations outside the United States represented approximately 23 percent, 28 percent and 31 percent of our revenues for the years ended December 31, 2017, 2016 and 2015, respectively. We expect that revenues from our international operations will continue to account for a material portion of our total revenues. As a result, we are subject to the risks of doing business outside the United States, including:

•	rapid changes in governmental, economic or political policy, political or civil unrest, acts of terrorism or the threat of international boycotts or U.S. anti-boycott legislation;

•	increases in anti-American sentiment and the identification of the licensed brands as an American brand;

•	recessionary trends or economic instability in international markets;

•	changes in foreign currency exchange rates or currency restructurings and hyperinflation or deflation in the countries in which we operate;

•	the effect of disruptions caused by severe weather, natural disasters, outbreak of disease or other events that make travel to a particular region less attractive or more difficult;

•	the presence and acceptance of varying levels of business corruption in international markets and the effect of various anti-corruption and other laws;

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•	the imposition of restrictions on currency conversion or the transfer of funds or limitations on our ability to repatriate non-U.S. earnings in a tax-efficient manner;

•	the ability to comply with or the effect of complying with complex and changing laws, regulations and policies of foreign governments that may affect investments or operations, including foreign ownership restrictions, import and export controls, tariffs, embargoes, increases in taxes paid and other changes in applicable tax laws;

•	instability or changes in a country's or region's economic, regulatory or political conditions, including inflation, recession, interest rate fluctuations and actual or anticipated military or political conflicts or any other change resulting from the U.K.'s June 2016 vote to leave the European Union (commonly known as "Brexit");

•	uncertainties as to local laws regarding, and enforcement of, contract and intellectual property rights;

•	forced nationalization of our properties by local, state or national governments; and

•	the difficulties involved in managing an organization doing business in many different countries.

These factors may adversely affect the revenues earned from and the market value of 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.

Failure to comply with laws and regulations applicable to our international operations may increase costs, reduce profits, limit growth or subject us to broader liability.

Our business operations in countries outside the U.S. are subject to a number of laws and regulations, including restrictions imposed by the FCPA, as well as trade sanctions administered by the 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 manage or own 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 an affiliate of HNA or HNA's affiliates or Blackstone or Blackstone's affiliates. Other affiliates of HNA or Blackstone have in the past or may in the future be required to make disclosures pursuant to 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.

The loss of senior executives or key field personnel, such as general managers, could significantly harm our business.

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.

Collective bargaining activity could disrupt our operations, increase our labor costs or interfere with the ability of our management to focus on executing our business strategies.

A significant number of our employees (approximately 31 percent) and employees of our hotel owners are covered by collective bargaining agreements and similar agreements. If relationships with our employees or employees of our hotel owners or the unions that represent them become adverse, the properties we manage, franchise, own or lease could experience labor disruptions such as strikes, lockouts, boycotts and public demonstrations. A number of our collective bargaining agreements, representing approximately 15 percent of our organized employees, have expired and are in the process of being renegotiated, and we may be required to negotiate additional collective bargaining agreements in the future if more employees become unionized. Labor disputes, which may be more likely when collective bargaining agreements are being negotiated, could harm our relationship with our employees or employees of our hotel owners, result in increased regulatory inquiries and enforcement by governmental authorities and deter guests. Further, adverse publicity related to a labor dispute could harm our reputation and reduce customer demand for our services. Labor regulation and the negotiation of new or existing collective bargaining agreements could lead to higher wage and benefit costs, changes in work rules that raise operating expenses, legal costs and limitations on our ability or the ability of our third-party property owners to take cost saving measures during economic downturns. We do not have the ability to control the negotiations of collective bargaining agreements covering unionized labor employed by many third-party property owners. Increased unionization of our workforce, new labor legislation or changes in regulations could disrupt our operations, reduce our profitability or interfere with the ability of our management to focus on executing our business strategies.

Labor shortages could restrict our ability to operate our properties or grow our business or result in increased labor costs that could adversely affect our results of operations.

Our success depends in large part on our ability to attract, retain, train, manage and engage employees. We employ or manage more 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 lease 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.

Any failure to protect our trademarks and other intellectual property could reduce the value of the Hilton brands and harm our business.

The recognition and reputation of our brands are important to our success. We have nearly 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-party claims that we infringe intellectual property rights of others could subject us to damages and other costs and expenses.

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:

•	be expensive and time consuming to defend, and result in significant damages;

•	force us to stop using the intellectual property that is being challenged or to stop providing products or services that use the challenged intellectual property;

•	force us to redesign or rebrand our products or services;

•	require us to enter into royalty, licensing, co-existence or other contracts to obtain the right to use a third party’s intellectual property;

•	limit our ability to develop new intellectual property; and

•	limit the use or the scope of our intellectual property or other rights.

In addition, we may be required to indemnify third-party owners of the hotels that we manage for any losses they incur as a result of any infringement claims against them. All necessary royalty, licensing or other contracts may not be available to us on acceptable terms. Any adverse results associated with third-party intellectual property claims could negatively affect our business.

Exchange rate fluctuations and foreign exchange hedging arrangements could result in significant foreign currency gains and losses and affect our business results.

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.

If the insurance that we or our owners carry does not sufficiently cover damage or other potential losses or liabilities to third parties involving properties that we manage, franchise or own, our profits could be reduced.

We operate in certain areas where the risk of natural disaster or other catastrophic losses exists, and the occasional incidence of such an event could cause substantial damage to us, our owners or the surrounding area. We carry, and/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 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.

Terrorism insurance may not be available at commercially reasonable rates or at all.

Following the September 11, 2001 terrorist attacks in New York City and the Washington, D.C. area, Congress passed the Terrorism Risk Insurance Act of 2002, which established the Terrorism Risk Insurance Program (the "Program") to provide insurance capacity for terrorist acts. The Program expired at the end of 2014 but was reauthorized, with some adjustments to its provisions, in January 2015 for six years through December 31, 2020. We carry, and we require our owners and our franchisees to carry, insurance from solvent insurance carriers to respond to both first-party and third-party liability losses related to terrorism. We purchase our first-party property damage and business interruption insurance from a stand-alone market in place of and to supplement insurance from government run pools. If the Program is not extended or renewed upon its expiration in 2020, or if there are changes to the Program that would negatively affect insurance carriers, premiums for terrorism insurance coverage will likely increase and/or the terms of such insurance may be materially amended to increase stated exclusions or to otherwise effectively decrease the scope of coverage available, perhaps to the point where it is effectively unavailable.

Terrorist attacks and military conflicts may adversely affect the hospitality industry.

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:

•	cause damage to one or more of our properties that may not be fully covered by insurance to the value of the damages;

•	cause all or portions of affected properties to be shut down for prolonged periods, resulting in a loss of income;

•	generally reduce travel to affected areas for tourism and business or adversely affect the willingness of customers to stay in or avail themselves of the services of the affected properties;

•	expose us to a risk of monetary claims arising out of death, injury or damage to property caused by any such attacks; and

•	result in higher costs for security and insurance premiums or diminish the availability of insurance coverage for losses related to terrorist attacks, particularly for properties in target areas, all of which could adversely affect our results.

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.

Changes in U.S. federal, state and local or foreign tax law, interpretations of existing tax law, or adverse determinations by tax authorities, could increase our tax burden or otherwise adversely affect our financial condition or results of operations.

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, 2005 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 Honors guest loyalty 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 $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. See Note 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.

Changes to accounting rules or regulations may adversely affect our reported financial condition and 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 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.

Changes to estimates or projections used to assess the fair value of our assets, or operating results that are lower than our current estimates at certain locations, may cause us to incur impairment losses that could adversely affect our results of operations.

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

amount may not be recoverable. Our evaluation of impairment requires us to make certain estimates and assumptions including projections of future results. After performing our evaluation for impairment, including an analysis to determine the recoverability of long-lived assets, we will record an impairment loss when the carrying value of the underlying asset, asset group or reporting unit exceeds its estimated fair value. If the estimates or assumptions used in our evaluation of impairment change, we may be required to record additional impairment losses on certain of these assets. If these impairment losses are significant, our results of operations would be adversely affected.

Governmental regulation may adversely affect the operation of our properties.

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 has 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.

Foreign or U.S. environmental laws and regulations may cause us to incur substantial costs or subject us to potential liabilities.

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.

The cost of compliance with the Americans with Disabilities Act and similar legislation outside of the U.S. may be substantial.

We are subject to the Americans with Disabilities Act ("ADA") and similar legislation in certain jurisdictions outside of the U.S. Under the ADA all public accommodations are required to meet certain federal requirements related to access and use by disabled persons. These regulations apply to accommodations first occupied after January 26, 1993; public accommodations built before January 26, 1993 are required to remove architectural barriers to disabled access where such removal is "readily achievable." The regulations also mandate certain operational requirements that hotel operators must observe. The failure of a property to comply with the ADA could result in injunctive relief, fines, an award of damages to private litigants or mandated capital expenditures to remedy such noncompliance. Any imposition of injunctive relief, fines, damage awards or capital expenditures could adversely affect the ability of an owner or franchisee to make payments under the applicable management or franchise contract and negatively affect the reputation of our brands. In November 2010, we entered into a settlement with the U.S. Department of Justice related to compliance with the ADA. Our obligations under this settlement expired in March 2015 except that certain managed and franchised hotels that were required to conduct surveys of their facilities remain under an obligation to remove architectural barriers at their facilities through March 15, 2022 and we have an obligation to have an independent consultant to monitor those barrier removal efforts during this period. If we fail to comply with the requirements of the ADA, we could be subject to fines, penalties, injunctive action, reputational harm and other business effects that could materially and negatively affect our performance and results of operations.

Casinos featured on certain of our properties are subject to gaming laws, and noncompliance could result in the revocation of the gaming licenses.

Several of our properties feature casinos, most of which are operated by third parties. Factors affecting the economic performance of a casino property include:

•	location, including proximity to or easy access from major population centers;

•	appearance;

•	local, regional or national economic and political conditions;

•	the existence or construction of competing casinos;

•	dependence on tourism; and

•	governmental regulation.

Jurisdictions in which our properties containing casinos are located, including Puerto Rico and Egypt, have laws and regulations governing the conduct of casino gaming. These jurisdictions generally require that the operator of a casino must be found suitable and be registered. Once issued, a registration remains in force until revoked. The law defines the grounds for registration, as well as revocation or suspension of such registration. The loss of a gaming license for any reason would have a material adverse effect on the value of a casino property and could reduce fee income associated with such operations and consequently negatively affect our business results.

We are subject to risks from litigation filed by or against us.

Legal or governmental proceedings brought by or on behalf of franchisees, third-party owners of managed properties, employees or customers may adversely affect our financial results. In recent years, a number of hospitality companies have been subject to lawsuits, including class action lawsuits, alleging violations of federal laws and regulations regarding workplace and employment matters, consumer protection claims and other commercial matters. A number of these lawsuits have resulted in the payment of substantial damages by the defendants. Similar lawsuits have been and may be instituted against us from time to time, and we may incur substantial damages and expenses resulting from lawsuits of this type, which could have a material adverse effect on our business. At any given time, we may be engaged in lawsuits or disputes involving third-party owners of our hotels. Similarly, we may from time to time institute legal proceedings on behalf of ourselves or others, the ultimate outcome of which could cause us to incur substantial damages and expenses, which could have a material adverse effect on our business.

Risks Related to Our Spin-offs

We may be unable to achieve some or all of the benefits that we expect to achieve from the spin-offs.

Although we believe that separating our ownership business and our timeshare business by means of the spin-offs has provided financial, operational, managerial and other benefits to us and our stockholders, the spin-offs may not provide results on the scope or scale we anticipate, and we may not realize any or all of the intended benefits. For example, if the statutory and regulatory requirements relating to REITs are not met by Park, the benefits of spinning off the ownership business may be reduced or may be unavailable to us, our stockholders and stockholders of Park. If we do not realize the intended benefits of the spin-offs, we or the businesses that were spun off could suffer a material adverse effect on our or their business, financial condition, results of operations and cash flows.

The spin-offs could result in substantial tax liability to us and our stockholders.

We received a private letter ruling from the IRS on certain issues relevant to qualification of the spin-offs as tax-free distributions under Section 355 of the Internal Revenue Code of 1986, as amended (the "Code"). Although the private letter ruling generally is binding on the IRS, the continued validity of the private letter ruling will be based upon and subject to the accuracy of factual statements and representations made to the IRS by us. Further, the private letter ruling is limited to specified aspects of the spin-offs under Section 355 of the Code and does not represent a determination by the IRS that all of the requirements necessary to obtain tax-free treatment to holders of our common stock and to us have been satisfied. Moreover, if any statement or representation upon which the private letter ruling was based was incorrect or untrue in any material respect,

or if the facts upon which the private letter ruling was based were materially different from the facts that prevailed at the time of the spin-offs, the private letter ruling could be invalidated. The opinion of tax counsel we received in connection with the spin-offs regarding the qualification of the spin-offs as tax-free distributions under Section 355 of the Code similarly relied on, among other things, the continuing validity of the private letter ruling and various assumptions and representations as to factual matters made by each of the spun-off companies and us which, if inaccurate or incomplete in any material respect, would jeopardize the conclusions reached by counsel in its opinion. The opinion is not binding on the IRS or the courts, and there can be no assurance that the IRS or the courts will not challenge the conclusions stated in the opinion or that any such challenge would not prevail. Additionally, recently enacted legislation denies tax-free treatment to a spin-off in which either the distributing corporation or the spun-off corporation is a REIT and prevents a distributing corporation or a spun-off corporation from electing REIT status for a 10-year period following a tax-free spin-off. Under an effective date provision, the legislation does not apply to distributions described in a ruling request initially submitted to the IRS before December 7, 2015. Because our initial request for the private letter ruling was submitted before that date and because we believe the distribution has been described in that initial request, we believe the legislation does not apply to the spin-off of Park. However, no ruling was obtained on that issue and thus no assurance can be given in that regard. In particular, the IRS or a court could disagree with our view regarding the effective date provision based on any differences that exist between the description in the ruling request and the actual facts relating to the spin-offs. If the legislation applied to the spin-off of Park, either the spin-off would not qualify for tax-free treatment or Park would not be eligible to elect REIT status for a 10-year period following the spin-off.

If the spin-offs and certain related transactions were determined to be taxable, the Company would be subject to a substantial tax liability that would have a material adverse effect on our financial condition, results of operations and cash flows. In addition, if the spin-offs were taxable, each holder of our common stock who received shares of Park and HGV would generally be treated as receiving a taxable distribution of property in an amount equal to the fair market value of the shares received.

Park or HGV may fail to perform under various transaction agreements that we have executed as part of the spin-offs.

In connection with the spin-offs, we, Park and HGV entered into a distribution agreement and various other agreements, including a transition services agreement, a tax matters agreement, an employee matters agreement and, as to Park, management agreements, and, as to HGV, a license agreement. Certain of these agreements provide for the performance of services by each company for the benefit of the other following the spin-offs. We are relying on Park and HGV to satisfy their performance and payment obligations under these agreements. In addition, it is possible that a court would disregard the allocation agreed to between us, Park and HGV and require that we assume responsibility for certain obligations allocated to Park and to HGV, particularly if Park or HGV were to refuse or were unable to pay or perform such obligations. The impact of any of these factors is difficult to predict, but one or more of them could cause reputational harm and could have an adverse effect on our financial position, results of operations and/or cash flows.

In connection with the spin-offs, each of Park and HGV indemnified us for certain liabilities. These indemnities may not be sufficient to insure us against the full amount of the liabilities assumed by Park and HGV, and Park and HGV may be unable to satisfy their indemnification obligations to us in the future.

In connection with the spin-offs, each of Park and HGV indemnified us with respect to such parties’ assumed or retained liabilities pursuant to the distribution agreement and breaches of the distribution agreement or other agreements related to the spin-offs. There can be no assurance that the indemnities from each of Park and HGV will be sufficient to protect us against the full amount of these and other liabilities. Third parties also could seek to hold us responsible for any of the liabilities that Park and HGV have agreed to assume. Even if we ultimately succeed in recovering from Park or HGV any amounts for which we are held liable, we may be temporarily required to bear those losses ourselves. Each of these risks could negatively affect our business, financial condition, results of operations and cash flows.

If we are required to indemnify Park or HGV in connection with the spin-offs, we may need to divert cash to meet those obligations, which could negatively affect our financial results.

Pursuant to the distribution agreement entered into in connection with the spin-offs and certain other agreements among Park and HGV and us, we agreed to indemnify each of Park and HGV from certain liabilities. Indemnities that we may be required to provide Park and/or HGV may be significant and could negatively affect our business.

Risks Related to Our Indebtedness

Our substantial indebtedness and other contractual obligations could adversely affect our financial condition, our ability to raise additional capital to fund our operations, our ability to operate our business, our ability to react to changes in the economy or our industry and our ability to pay our debts and could divert our cash flow from operations for debt payments.

We have a significant amount of indebtedness. As of December 31, 2017, our total indebtedness, excluding unamortized deferred financing costs and discounts, was approximately $6.7 billion, and our contractual debt maturities of our long-term debt for the years ending December 31, 2018, 2019 and 2020, respectively, were $54 million, $55 million and $57 million. Our substantial debt and other contractual obligations could have important consequences, including:

•	requiring a substantial portion of cash flow from operations to be dedicated to the payment of principal and interest on our indebtedness, thereby reducing our ability to use our cash flow to fund our operations, capital expenditures or dividends to stockholders and to pursue future business opportunities;

•	increasing our vulnerability to adverse economic, industry or competitive developments;

•	exposing us to increased interest expense, as our degree of leverage may cause the interest rates of any future indebtedness (whether fixed or floating rate interest) to be higher than they would be otherwise;

•	exposing us to the risk of increased interest rates because certain of our indebtedness is at variable rates of interest;

•	making it more difficult for us to satisfy our obligations with respect to our indebtedness, and any failure to comply with the obligations of any of our debt instruments, including restrictive covenants, could result in an event of default that accelerates our obligation to repay indebtedness;

•	restricting us from making strategic acquisitions or causing us to make non-strategic divestitures;

•	limiting our ability to obtain additional financing for working capital, capital expenditures, product development, satisfaction of debt service requirements, acquisitions and general corporate or other purposes; and

•	limiting our flexibility in planning for, or reacting to, changes in our business or market conditions and placing us at a competitive disadvantage compared to our competitors who may be better positioned to take advantage of opportunities that our leverage prevents us from exploiting.

We are a holding company, and substantially all of our consolidated assets are owned by, and most of our business is conducted through, our subsidiaries. Revenues from these subsidiaries are our primary source of funds for debt payments and operating expenses. If our subsidiaries are restricted from making distributions to us, that may impair our ability to meet our debt service obligations or otherwise fund our operations. Moreover, there may be restrictions on payments by subsidiaries to their parent companies under applicable laws, including laws that require companies to maintain minimum amounts of capital and to make payments to stockholders only from profits. As a result, although a subsidiary of ours may have cash, we may not be able to obtain that cash to satisfy our obligation to service our outstanding debt or fund our operations.

Certain of our debt agreements impose significant operating and financial restrictions on us and our subsidiaries, which may prevent us from capitalizing on business opportunities.

The indentures that govern our senior notes and the credit agreement that governs our senior secured credit facilities impose significant operating and financial restrictions on us. These restrictions limit our ability and/or the ability of our subsidiaries to, among other things:

•	incur or guarantee additional debt or issue disqualified stock or preferred stock;

•	pay dividends (including to us) and make other distributions on, or redeem or repurchase, capital stock;

•	make certain investments;

•	incur certain liens;

•	enter into transactions with affiliates;

•	merge or consolidate;

•	enter into agreements that restrict the ability of restricted subsidiaries to make dividends or other payments to the issuers;

•	designate restricted subsidiaries as unrestricted subsidiaries; and

•	transfer or sell assets.

In addition, if, on the last day of any period of four consecutive quarters, the aggregate principal amount of revolving credit loans, swing line loans and/or letters of credit (excluding up to $50 million of letters of credit and certain other letters of credit that have been cash collateralized or back-stopped) that are issued and/or outstanding is greater than 30 percent of the revolving credit facility, the credit agreement will require us to maintain a consolidated first lien net leverage ratio not to exceed 7.0 to 1.0.

As a result of these restrictions, we are limited as to how we conduct our business and we may be unable to raise additional debt or equity financing to compete effectively or to take advantage of new business opportunities. The terms of any future indebtedness we may incur could include more restrictive covenants. We may not be able to maintain compliance with these covenants in the future and, if we fail to do so, we may not be able to obtain waivers from the lenders and/or amend the covenants.

Our failure to comply with the restrictive covenants described above, as well as other terms of our other indebtedness and/or the terms of any future indebtedness from time to time, could result in an event of default, which, if not cured or waived, could result in our being required to repay these borrowings before their due date. If we are forced to refinance these borrowings on less favorable terms or are unable to refinance these borrowings, our results of operations and financial condition could be adversely affected.

Servicing our indebtedness will require a significant amount of cash. Our ability to generate sufficient cash depends on many factors, some of which are not within our control.

Our ability to make payments on our indebtedness, to fund planned capital expenditures and to pay dividends to our stockholders will depend on our ability to generate cash in the future. To a certain extent, this is subject to general economic, financial, competitive, legislative, regulatory and other factors that are beyond our control. If we are unable to generate sufficient cash flow to service our debt and meet our other commitments, we may need to restructure or refinance all or a portion of our debt, sell material assets or operations or raise additional debt or equity capital. We may not be able to effect any of these actions on a timely basis, on commercially reasonable terms or at all, and these actions may not be sufficient to meet our capital requirements. In addition, the terms of our existing or future debt arrangements may restrict us from effecting any of these alternatives. Finally, our ability to raise additional equity capital may be restricted by the stockholders agreement we entered into with HGV and certain entities affiliated with Blackstone that is intended to preserve the tax-free status of the spin-offs of Park and HGV.

Despite our current level of indebtedness, we may be able to incur substantially more debt and enter into other transactions, which could further exacerbate the risks to our financial condition described above.

We may be able to incur significant additional indebtedness, including secured debt, in the future. Although the credit agreements and indentures that govern substantially all of our indebtedness contain restrictions on the incurrence of additional indebtedness and entering into certain types of other transactions, these restrictions are subject to a number of qualifications and exceptions. Additional indebtedness incurred in compliance with these restrictions could be substantial. These restrictions also do not prevent us from incurring obligations, such as trade payables, that do not constitute indebtedness as defined under our debt instruments. To the extent new debt is added to our current debt levels, the substantial leverage risks described in the preceding three risk factors would increase.

Risks Related to Ownership of Our Common Stock

The interests of certain of our stockholders may conflict with ours or yours in the future.

HNA, which purchased 25 percent of our common stock from Blackstone in March 2017, beneficially owned approximately 26.0 percent of our common stock as of December 31, 2017 as a result of our share repurchases lowering our total number of shares outstanding. Blackstone and its affiliates beneficially owned approximately 5.4 percent of our common stock as of December 31, 2017. Moreover, under our by-laws and each stockholders’ agreement with HNA and Blackstone, for so long as HNA or Blackstone, as applicable, retains specified levels of ownership of us, we have agreed to nominate to our board individuals designated by them. Thus, for so long as HNA and Blackstone continue to own specified percentages of our stock, each will be able to influence the composition of our board of directors and the approval of actions requiring stockholder approval. Accordingly, during that period of time, each of HNA and Blackstone may have influence with respect to our management, business plans and policies, including the appointment and removal of our officers. For example, for so long as HNA or Blackstone continues to own a significant percentage of our stock, HNA or Blackstone may be able to influence whether or not a change of control of our company or a change in the composition of our board of directors occurs. The concentration of ownership could deprive you of an opportunity to receive a premium for your shares of common stock as part of a sale of our company and ultimately might affect the market price of our common stock.

Each of HNA and Blackstone and its respective affiliates engage in a broad spectrum of activities, including investments in the hospitality industry. In the ordinary course of their business activities, each of HNA and Blackstone and their respective affiliates may engage in activities where their interests conflict with ours or those of our stockholders. For example, HNA acquired Carlson Hotels in December 2016 and owns an interest in NH Hotel Group. Blackstone owns interests in La Quinta Holdings Inc. and certain other investments in the hospitality industry and may pursue ventures that compete directly or indirectly with us. In addition, affiliates of HNA and Blackstone directly and indirectly own hotels that we manage or franchise, and they may in the future enter into other transactions with us, including hotel development projects, that could result in their having interests that could conflict with ours. Our amended and restated certificate of incorporation provides that none of Blackstone, any of its affiliates or any director who is not employed by us (including any non-employee director who serves as one of our officers in both his or her director and officer capacities) or his or her affiliates will have any duty to refrain from engaging, directly or indirectly, in the same business activities or similar business activities or lines of business in which we operate. Under our stockholders agreement with HNA, we agreed to renounce any interest or expectancy, or right to be offered an opportunity to participate in, any business opportunity or corporate opportunity presented to HNA or its affiliates. HNA or Blackstone also may pursue acquisition opportunities that may be complementary to our business, and, as a result, those acquisition opportunities may be unavailable to us. In addition, HNA or Blackstone may have an interest in pursuing acquisitions, divestitures and other transactions that, in their judgment, could enhance their respective investments, even though such transactions might involve risks to you.

While we currently pay a quarterly cash dividend to holders of our common stock, we may change our dividend policy at any time.

Although we currently pay a quarterly cash dividend to holders of our common stock, we have no obligation to do so, and our dividend policy may change at any time without notice to our stockholders. The declaration and payment of dividends is at the discretion of our board of directors in accordance with applicable law after taking into account various factors, including our financial condition, operating results, current and anticipated cash needs, limitations imposed by our indebtedness, legal requirements and other factors that our board of directors deems relevant.

Future issuances of common stock by us, and the availability for resale of shares held by certain investors, may cause the market price of our common stock to decline.

Blackstone owned approximately 5.4 percent and HNA owned approximately 26.0 percent of our outstanding common stock as of December 31, 2017. Pursuant to registration rights agreements, Blackstone and certain management stockholders have, and HNA will have, the right to cause us, in certain instances, at our expense, to file registration statements under the Securities Act covering resales of our common stock held by them. These shares also may be sold pursuant to Rule 144 under the Securities Act, depending on their holding period and subject to restrictions in the case of shares held by persons deemed to be our affiliates. As restrictions on resale end or if these stockholders exercise their registration rights, the market price of our stock could decline if the holders of restricted shares sell them or are perceived by the market as intending to sell them. HNA is subject to specified transfer restrictions pursuant to the terms of a stockholders agreement with us. Those restrictions are subject to specified exceptions, including in connection with margin loan arrangements and any proposed transfers that a majority of the disinterested members of our board of directors may approve. Each of HNA and Blackstone has pledged

substantially all of the shares of our common stock held by it pursuant to margin loan arrangements and any foreclosure upon those shares could result in sales of a substantial number of shares of our common stock in the public market. Sales of a substantial number of shares of our common stock in the public market, or the perception that these sales could occur, could substantially decrease the market price of our common stock.

Anti-takeover provisions in our organizational documents and Delaware law might discourage or delay acquisition attempts for us that you might consider favorable.

Our amended and restated certificate of incorporation and amended and restated by-laws contain provisions that may make the merger or acquisition of our company more difficult without the approval of our board of directors. Among other things:

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although we do not have a stockholder rights plan, and would either submit any such plan to stockholders for ratification or cause such plan to expire within a year, these provisions would allow us to authorize the issuance of undesignated preferred stock in connection with a stockholder rights plan or otherwise, the terms of which may be established and the shares of which may be issued without stockholder approval, and which may include super voting, special approval, dividend, or other rights or preferences superior to the rights of the holders of common stock;

•	these provisions prohibit stockholder action by written consent unless such action is recommended by all directors then in office;

•	these provisions provide that our board of directors is expressly authorized to make, alter or repeal our bylaws and that our stockholders may only amend our by-laws with the approval of 80 percent or more of all the outstanding shares of our capital stock entitled to vote; and

•	these provisions establish advance notice requirements for nominations for elections to our board or for proposing matters that can be acted upon by stockholders at stockholder meetings.

Further, as a Delaware corporation, we are subject to provisions of Delaware law, which may impair a takeover attempt that our stockholders may find beneficial. These anti-takeover provisions and other provisions under Delaware law could discourage, delay or prevent a transaction involving a change in control of our company, including actions that our stockholders may deem advantageous, or negatively affect the trading price of our common stock. These provisions could also discourage proxy contests and make it more difficult for you and other stockholders to elect directors of your choosing and to cause us to take other corporate actions you desire.