UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

x    ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2017

or

¨        TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from              to             

Commission File Number: 001-35198

Pandora Media, Inc.

(Exact name of registrant as specified in its charter)

Delaware	94-3352630
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
2101 Webster Street, Suite 1650 Oakland, CA	94612
(Address of principal executive offices)	(Zip Code)

(510) 451-4100

(Registrant’s telephone number, including area code)

Securities registered pursuant to section 12(g) of the Act:

Title of each class	Name of each exchange on which registered
Common stock, $0.0001 par value	The New York Stock Exchange

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

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

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

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

          Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§ 229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  o

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

 

Large accelerated filer x	Accelerated filer o
Non-accelerated filer o	Smaller reporting company o
(Do not check if a smaller reporting company)	Emerging growth company o

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

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

          The aggregate market value of the voting common stock held by non-affiliates of the registrant as of June 30, 2017 (the last business day of the registrant's most recently completed second quarter), based on the closing price of such stock on The New York Stock Exchange on such date was approximately $1,189 million. This calculation excludes the shares of common stock held by executive officers, directors and stockholders whose ownership exceeds 5% outstanding at June 30, 2017. This calculation does not reflect a determination that such persons are affiliates for any other purposes.

          On February 21, 2018 the registrant had 254,884,000 shares of common stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

          Portions of the Proxy Statement for the registrant’s 2018 Annual Meeting of Stockholders (the "Proxy Statement"), to be filed within 120 days of the end of the fiscal year ended December 31, 2017, are incorporated by reference in Part III hereof. Except with respect to information specifically incorporated by reference in this Annual Report on Form 10-K, the Definitive Proxy Statement is not deemed to be filed as part of this Annual Report on Form 10-K.

Pandora Media, Inc.

 Form 10-K

 Table of Contents

		Page No.
	PART I
Item 1	Business	2
Item 1A	Risk Factors	11
Item 1B	Unresolved Staff Comments	35
Item 2	Properties	35
Item 3	Legal Proceedings	35
Item 4	Mine Safety Disclosures	35
	PART II
Item 5	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	36
Item 6	Selected Financial Data	38
Item 7	Management’s Discussion and Analysis of Financial Condition and Results of Operations	40
Item 7A	Quantitative and Qualitative Disclosures About Market Risk	61
Item 8	Financial Statements and Supplementary Data	62
Item 9	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	106
Item 9A	Controls and Procedures	106
Item 9B	Other Information	107
	PART III
Item 10	Directors, Executive Officers and Corporate Governance	108
Item 11	Executive Compensation	108
Item 12	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	108
Item 13	Certain Relationships and Related Transactions and Director Independence	108
Item 14	Principal Accountant Fees and Services	108
	PART IV
Item 15	Exhibits, Financial Statement Schedules	109
Signatures		110

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS AND INDUSTRY DATA

This Annual Report on Form 10-K contains "forward-looking statements" that involve substantial risks and uncertainties. The statements contained in this Annual Report on Form 10-K that are not purely historical are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the "Securities Act"), and Section 21E of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), including, but not limited to, statements regarding our expectations, beliefs, intentions, strategies, future operations, future financial position, future revenue, projected expenses and plans and objectives of management. In some cases, you can identify forward-looking statements by terms such as "anticipate," "believe," "estimate," "expect," "intend," "may," "might," "plan," "project," "will," "would," "should," "could," "can," "predict," "potential," "continue," "objective," or the negative of these terms, and similar expressions intended to identify forward-looking statements. However, not all forward-looking statements contain these identifying words. These forward-looking statements reflect our current views about future events and involve known risks, uncertainties and other factors that may cause our actual results, levels of activity, performance or achievement to be materially different from those expressed or implied by the forward-looking statements. Factors that could cause or contribute to such differences include, but are not limited to, those identified below, and those discussed in Item 1A—"Risk Factors" included in this Annual Report on Form 10-K. Furthermore, such forward-looking statements speak only as of the date of this report. Except as required by law, we undertake no obligation to update any forward-looking statements to reflect events or circumstances after the date of such statements. We qualify all of our forward-looking statements by these cautionary statements. In addition, the industry in which we operate is subject to a high degree of uncertainty and risk due to a variety of factors including those described in the section entitled "Risk Factors." These and other factors could cause our results to differ materially from those expressed in this Annual Report on Form 10-K.

Some of the industry and market data contained in this Annual Report on Form 10-K are based on independent industry publications, including those generated by Triton Digital Media or "Triton," International Data Corporation or "IDC," eMarketer or other publicly available information. This information involves a number of assumptions and limitations. Although we believe that each source is reliable as of its respective date, we have not independently verified the accuracy or completeness of this information.

As used herein, "Pandora," the "Company," "we," "our," and similar terms refer to Pandora Media, Inc. and, where appropriate, its wholly owned subsidiaries, unless the context indicates otherwise.

"Pandora" and other trademarks of ours appearing in this report are our property. This report contains additional trade names and trademarks of other companies. We do not intend our use or display of other companies' trade names or trademarks to imply an endorsement or sponsorship of us by such companies, or any relationship with any of these companies.

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PART I

ITEM 1. BUSINESS

Overview

Pandora—Streaming Radio and On-Demand Music Services

Pandora is the world’s most powerful music discovery platform, offering a personalized experience for each of our listeners wherever and whenever they want to listen to music—whether through mobile devices, car speakers or connected devices in the home. Unlike traditional radio that broadcasts the same content at the same time to all of its listeners, we enable our listeners to create personalized stations and playlists, as well as search and play songs and albums on-demand. The Music Genome Project, our content programming algorithms and data collected from our listeners power our ability to predict listener music preferences, play music content suited to the tastes of each individual listener and introduce listeners to the music we think they will love. Founded by musicians, Pandora also empowers artists with valuable data and tools to help grow their audience and connect with their fans.

Pandora is available as an ad-supported radio service, a radio subscription service called Pandora Plus and an on-demand subscription service called Pandora Premium. The majority of our listener hours occur on mobile devices, with the majority of our revenue generated from advertising on our ad-supported radio service on these devices. With billions of data points that help us understand our users' preferences, we offer both local and national advertisers the opportunity to deliver targeted messages to our listeners using a combination of audio, display and video advertisements. We also generate increasing revenue from our subscription offerings.

For the year ended December 31, 2017, we streamed 20.61 billion hours of content, and as of December 31, 2017, we had 74.7 million active users during the trailing 30-day period and 5.48 million paid subscribers. Since we first launched our ad-supported service in 2005, our listeners have created over 12 billion stations.

Pandora—Ad-Supported Radio Service

Our ad-supported service allows listeners to access our catalog of music, comedy, livestreams and podcasts through our personalized playlist generating system for free across all of our delivery platforms. Our ad-supported service is valued by lean-back listeners, as it uses the Music Genome Project to instantly generate a station that plays music we think that listener will enjoy. Over time, this service has evolved by using data science to further tailor the listener experience based on listener reactions to the content we pick. Listeners also have the ability to add variety to and rename stations, which further allows for the personalization of the service. We also offer listeners on our ad-supported service the option to gain temporary access to on-demand listening experience, which includes some features of our Pandora Premium service, in exchange for viewing a video ad. We call this experience Premium Access.

Pandora Plus—Subscription Radio Service

Pandora Plus is an ad-free, paid subscription version of the Pandora radio service that also includes replays, additional skipping of songs, offline listening, higher quality audio on supported devices and longer timeout-free listening. This service is valued by listeners who want the ability to have limited interactive features such as controlling skips and replays. Similar to the ad-supported service, the more the listener interacts with the platform, the more we tailor the content we recommend to the listener. Premium Access is also available to Pandora Plus listeners.

Pandora Premium—On-Demand Subscription Service

Our on-demand subscription service, Pandora Premium, launched in the United States in April 2017. Pandora Premium combines the radio features of Pandora Plus with a unique, on-demand experience, providing users with the ability to search, play and collect songs and albums, build playlists on their own or with the tap of a button, listen to curated playlists and share playlists on social networks. Unique to Pandora, a listener can create partial playlists and have Pandora complete the playlist based on the user's listening activity using the Music Genome Project.

Beyond song delivery, listeners can discover more about the music they hear by reading the history of their favorite artists and viewing artist photos. Mobile listeners also have access to customized listener profiles which leverage data science to showcase a listener’s musical identity by highlighting user data such as recent favorites, top artists of all time, playlists and thumbs. Our services also incorporate social networking features. Our music feed enables a real-time, centralized stream for

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listeners to view the music that their social connections are experiencing and to provide and receive recommendations for songs, albums and artists. Listeners can also share their stations, songs, albums or playlists through social media, messaging apps and email by using our share feature.

Ticketing Service

Prior to September 1, 2017, we operated a ticketing service through our former subsidiary Ticketfly, a leading live events technology company that provides ticketing and marketing software and services for clients, which are venues and event promoters, across North America. We completed the sale of Ticketfly on September 1, 2017. Refer to Note 5 "Dispositions" in the Notes to Consolidated Financial Statements for further details on the Ticketfly disposition.

Our Strategy

Drive and Retain Active Users

It is critical that we drive and retain active users. We believe that our three-tier offering, which includes our ad-supported service, Pandora Plus and Pandora Premium, provides listeners multiple ways to enjoy Pandora. Continued product development, including more focus on interactivity and voice, more effective marketing and expanded partnerships with CE providers, content platforms and others, are important elements of our efforts to drive and retain active users. Additionally, we are actively focused on offering content beyond music, such as podcasts.

Increase Monetization Opportunities

Pandora is a significant provider of digital audio advertising and we believe there is a large opportunity to expand monetization. These improvements will primarily be enabled by new technology development and are intended to yield a combination of incremental advertising capacity, optimized pricing and increased sell through.

Focus on Execution and Efficiencies

Digital audio and music is a large and growing market, but highly competitive. It is critical that we focus on execution and efficiencies. This includes focusing resources on strategic growth areas, accelerating product development cycles and increasing marketing effectiveness as well as managing content costs where possible.

In January 2018, we announced an organizational restructuring designed to prioritize our strategic growth initiatives and optimize overall business performance. The redesign shifts resources to focus on ad-tech and audience development efforts, while positioning the company for improved operating leverage over time. It also simplifies the organization into a flatter structure for smarter, faster execution.

Our Technologies

Pandora—Streaming Radio and On-Demand Music Services

At the heart of our service are proprietary personalization technologies, including the Music Genome Project and our radio and playlist generating algorithms.

Music Genome Project and Playlisting Algorithms

The Music Genome Project is a database of over 1.5 million uniquely analyzed songs from over 250 thousand artists, spanning over 660 genres and sub-genres, which our team of trained musicologists has developed one song at a time by evaluating and cataloging each song's particular attributes. The Music Genome Project database is a subset of our full catalog available to be played. Once we select music to become part of the Music Genome Project, our music analysts genotype the music by examining up to 450 attributes including objectively observable metrics such as tone and tempo, as well as subjective characteristics, such as lyrics, vocal texture and emotional intensity. Over time, our service has evolved by using data science to develop playlisting algorithms that further tailor the listener experience based on individual listener and broader audience reactions to the recordings we pick. We have integrated this technology into our on-demand music service, Pandora Premium, giving listeners the ability to search and play any track or album as well as offering unique playlist features tailored to each listener's distinct preferences. Listeners have the ability to search, play and collect songs and albums, build playlists on their own or with the tap of a button and automatically generate playlists based on their listening activity and the power of our Music Genome Project. Our team of curators, music analysts and data scientists have sifted through tens of millions of tracks to help

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listeners quickly find what they are looking for to create their own unique playlists. We employ rigorous hiring and training standards for selecting our music analysts, who typically have four-year degrees in music theory, composition or performance, and we provide them with intensive training in the Music Genome Project's precise methodology.

Next Big Sound ("NBS")

NBS Platform. NBS is the leading provider of online music analytics and insights tracking hundreds of thousands of artists around the world. NBS was founded in 2009 and tracks social, streaming and video data in one centralized platform. Sources range from Facebook and Twitter to Wikipedia, YouTube, Vevo, Instagram and many others. The NBS platform complements Pandora's Artist Marketing Platform ("AMP") and expands the suite of data-driven products that Pandora offers music makers and content partners.

Distribution and Partnerships

Pandora—Streaming Radio and On-Demand Music Services

A key element of our strategy is to make the Pandora service available in any environment that has internet connectivity. To this end, we make the Pandora service available through a variety of distribution channels. In addition to streaming our service to computers, we have developed Pandora mobile device applications ("apps") for smartphones and mobile operating systems, such as the iPhone and Android, and for tablets, including the iPad and Android tablets. We distribute those mobile apps free to listeners via app stores.

Pandora is integrated with connected devices, including automobiles, automotive aftermarket devices and consumer electronic devices, including many voice-based devices. Currently, most automobile integrations rely on smartphones for internet connectivity, which has enabled Pandora to be available in the best-selling passenger vehicles in the United States. Some automobiles are now using embedded, built-in internet connectivity to power the Pandora experience. These native integrations allow drivers to control the service via in-dash entertainment systems. As part of this ongoing effort to extend our reach in the car, we also built support for Android Auto and Apple CarPlay into our mobile applications. We expect these platforms will develop and grow significantly and help broaden our reach and provide consumers with additional flexibility for accessing Pandora in the car. As of December 31, 2017, approximately 35.2 million unique users have activated Pandora through a native integration in 27 major automobile brands and 8 automotive aftermarket manufacturers.

Additionally, Pandora is integrated with thousands of consumer electronic and voice-based devices, including Sonos, Fitbit, Roku, Google Home, Amazon Echo, Comcast Xfinity, Apple TV and Microsoft Xbox. These integrations have made it easier for listeners to personalize their music experience anywhere they listen to music.

Advertising Revenue

We derive the substantial majority of our revenue from the sale of audio, display and video advertising for delivery across our computer, mobile and other connected device platforms. We generate the majority of our revenue from mobile and other connected devices, which presents an opportunity for our current and potential advertisers to reach our audience anytime, anywhere that they enjoy music.

Our advertising products allow both local and national advertisers to target and connect with listeners based on attributes including age, gender, zip code and content preferences using multi-platform ad campaigns to target their advertising messages to listeners anytime and anywhere. In the years ended December 31, 2015, 2016 and 2017, advertising revenue accounted for approximately 80%, 77% and 73% of our total revenue, respectively. The year-over-year change in revenue mix is due to an increase in subscription revenue related to increased Pandora Plus and Pandora Premium subscribers.

Audio Advertising. Our audio advertising products allow custom audio messages to be delivered during content programming sessions via short ad interludes on our ad-supported service. Audio ads are available across all of our delivery platforms. On supported delivery platforms, audio ads can be accompanied by display ads to further enhance advertisers' messages. We are a significant provider of digital audio advertising in the United States.

Display Advertising. Our display advertising products offer opportunities to maximize advertising exposure to listeners of our ad-supported service on computers and mobile platforms. The graphical interface for our services on these delivery platforms is divided between our tuner, which contains our player controls and "now playing" information, and the information space surrounding our tuner. Our display ads include industry-standard banner ads of various sizes and placements within the information space surrounding our tuner, depending on the delivery platform and listener interaction.

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Video Advertising. Our video advertising products allow delivery of rich, branded messages to further engage listeners of our ad-supported service. We currently offer video ad products, all of which are designed to play only upon listener interaction or opt-in, ensuring that advertisers have 100% share of the listener's attention during natural breaks accepted by an engaged audience. Some video ad products operate across our mobile and computer platforms, while others operate only on our mobile platform. All are designed to ensure they are viewable while playing, using interactions with Pandora to determine when a listener is engaged with the screen. Video Plus, Pandora’s newest mobile video product, enables listeners to elect to watch a video ad in return for limited access to features available in our subscription services, while brands pay only for 15 seconds of completed video view. Another video advertising product, Sponsored Listening, offers listeners one or four hours of uninterrupted music, in exchange for the listener’s active brand interaction, such as watching a video advertisement, interacting with rich media or visiting the advertiser's landing page.

Advertising Technologies. We have developed a suite of proprietary advertising technologies including order management, advertising serving and timing, native advertising formats, targeting and reporting. Given the ongoing evolution in advertising technologies, we plan to continue to invest aggressively in our ad tech to make Pandora a more efficient advertising partner and to become more competitive with our digital peers.

Native Advertising. Our audio, display and video advertising products can be designed and modified by us and by advertisers to tailor advertising campaigns to fit specific advertiser needs. Our advertisers can create custom "branded" stations from our music library that can be accessed by listeners of our ad-supported and subscription services, as well as engage listeners by allowing them to personalize the branded stations through listener-controlled variables.

Audience Targeting. Our audio, display, video and native advertising products have access to a set of over 2,000 targeting segments across all of our platforms, ranging from Pandora’s unique proprietary targeting segments to second- and third-party enabled segments. Examples include Pandora’s inferred Spanish Speakers and Political Preference proprietary segments, direct customer CRM upload and Datalogix and Neustar third-party segments. Additionally, advertisers can benefit from our proprietary ad targeting capabilities, which leverage listener-submitted profile information, enabling advertisers to precisely reach sought-after consumers without needing third-party cookies.

Programmatic Advertising. We have a programmatic advertising solution that allows advertisers and agencies to purchase display advertising. We intend to continue investing in programmatic advertising solutions and are currently testing video and audio programmatic offerings. We believe this is an important element to improving monetization.

To enhance our ability to compete with local terrestrial radio stations for advertisers’ spending, our advertising inventory is integrated into the leading radio media buying platforms, Mediaocean and STRATA, and we are continuing to enhance the ability of radio advertisers to purchase media on these platforms, which incorporate Triton measurements of our radio audience reach side-by-side with terrestrial radio metrics.

We provide in-car advertising solutions, offering advertisers the opportunity to reach in-car audiences through audio ads running on vehicle models and aftermarket automotive devices with native Pandora automotive integrations.

In addition, we have invested in building a local advertising sales force in major radio markets. As of December 31, 2017, Pandora has 130 local sellers in 37 markets in the United States.

Our integration into standard radio media-buying processes and measurement, our in-car advertising solutions, our local advertising sales force and our programmatic advertising buying solution are key elements of our strategy to expand our penetration of the radio advertising market. Our success in executing this strategy is subject to numerous risks and uncertainties, including those described in Item 1A—"Risk Factors".

Subscription and Other Revenue

Subscription and other revenue is generated primarily through the sale of monthly or annual paid subscriptions to Pandora Plus and Pandora Premium. Subscription revenue is recognized on a straight-line basis over the duration of the subscription period. For the years ended December 31, 2015, 2016 and 2017, subscription and other revenue accounted for 19%, 16% and 22% of our total revenue, respectively.

Ticketing Service Revenue

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Prior to the sale of Ticketfly on September 1, 2017, ticketing service revenue was generated primarily from service and merchant processing fees generated on ticket sales through the Ticketfly platform. Ticketfly sells tickets to fans for events on behalf of clients and charges either a fee per ticket or a percentage of the total convenience charge and order processing fee for its services at the time the ticket for an event is sold. Ticketing service revenue is recorded net of the face value of the ticket at the time of the sale, as Ticketfly generally acts as the agent in these transactions. For the years ended December 31, 2015, 2016 and 2017, ticketing service revenue accounted for approximately 1%, 6% and 5% of our total revenue. As Ticketfly was acquired on October 31, 2015, and subsequently sold on September 1, 2017, the consolidated statements of operations include ticketing service revenue for the two months ended December 31, 2015, the year ended December 31, 2016 and the period ended September 1, 2017. Ticketing service revenue does not include revenue subsequent to the disposition of Ticketfly. Refer to Note 5 "Dispositions" in the Notes to Consolidated Financial Statements for further details on the Ticketfly disposition.

Content, Copyrights and Royalties

The content we stream to users of the Pandora service consists primarily of music. To stream music, we must obtain licenses from, and pay royalties to, copyright owners, or their agents, for each sound recording that we stream, as well as for each underlying musical work, subject to certain exclusions. These licensing and royalty arrangements strongly impact our business operations. Refer to our discussion of these matters in Item 1A—"Risk Factors".

Sound Recordings

For sound recordings, we pay content acquisition costs based on the terms of direct license agreements with major and independent music labels and distributors for the significant majority of the sound recordings we stream on our ad-supported service, Pandora Plus and Pandora Premium. Depending on the applicable service, these license agreements generally require us to pay either a per-performance fee based on the number of sound recordings we transmit, a percentage of revenue associated with the service, or a per-subscriber minimum amount. Certain of these license agreements require minimum guarantee payments, some of which are paid in advance. Refer to Note 2, "Summary of Significant Accounting Policies" for our policy on prepaid content acquisition costs.

If we have not entered into a direct license agreement with the copyright owner of a particular sound recording that is streamed on our services, we stream that sound recording pursuant to the statutory license and pay the applicable rates set by the Copyright Royalty Board ("CRB") for the period from January 1, 2016 through December 31, 2020. The rates for non-subscription services, such as our ad-supported service, were set at $0.0017 per play and the rates for subscription services, such as Pandora Plus, were set at $0.0022, adjusted for inflation. Effective January 1, 2018, these rates were adjusted for inflation to $0.0018 per play for non-subscription services and $0.0023 per play for subscription services. Sound recordings streamed under the statutory license and paid at the CRB-set rates can only be played in radio mode on our services. These sound recordings cannot be played on-demand or offline and are not eligible for replay or additional skips.

Musical Works

Content acquisition costs for musical works are negotiated with and paid to performing rights organizations ("PROs") such as the American Society of Composers, Authors and Publishers ("ASCAP"), Broadcast Music, Inc. ("BMI"), SESAC, Inc. ("SESAC") and Global Music Rights ("GMR"), and directly to publishing companies. Content acquisition costs for the streaming of musical works on our ad-supported service are calculated such that each copyright holder receives its usage-based and ownership-based share of a royalty pool equal to 20% of the content acquisition costs paid by us for sound recordings on our ad-supported service. Content acquisition costs for the streaming of musical works on our subscription services are equal to the rates determined in accordance with the statutory license set forth in 17 U.S.C. §115 ("Section 115").

Rate-Setting Proceedings for Reproduction Rights under Section 115

The rate structure for the statutory license for reproduction rights under Section 115 expired at the end of 2017. A new rate structure was set in January 2018 covering the period from January 1, 2018 through December 31, 2022 by a three judge CRB panel, and we were one of five commercial music service operators (along with Amazon, Apple, Google and Spotify) that participated in rate-setting proceedings that determined these rates (the "Phonorecords III Proceedings"). The Nashville Songwriters Association International, the National Association of Music Publishers and George Johnson Music Publishing are also participating in the Phonorecords III Proceedings. A trial before the CRB concluded in April 2017, and the CRB rendered a decision in January 2018 ("the Initial Determination"). If the Initial Determination is adopted and affirmed, the "all-in" rate that streaming services, including Pandora, will pay to music publishers and songwriters for the mechanical rights and performance rights needed in connection with interactive streaming will increase annually between 2018 and 2022: from 11.4% of revenues or 22.0% of label payments in 2018, to 15.1% of revenues or 26.2% of label payments by 2022. Certain per-subscriber

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minimum royalty floors also apply depending on the type of service. The CRB may elect to modify the Initial Determination at the request of the participants in the Phonorecords III Proceedings, and thereafter the final CRB decision may be appealed for review by the U.S. Court of Appeals for the District of Columbia Circuit.

The Phonorecords III Proceedings are important to us because our direct licenses with music publishers use the Section 115 rates. As a result, increases in the Section 115 rates increase our content acquisition costs for our subscription services, which, if such increase were substantial, could materially harm our financial condition and hinder our ability to provide interactive features in our services, or cause one or more of our subscription services to not be economically viable.

Government Regulation

As a company conducting business on the internet, we are subject to a number of foreign and domestic laws and regulations relating to consumer protection, information security and data protection, among other things. Many of these laws and regulations are still evolving and could be interpreted in ways that could harm our business. In the area of information security and data protection, the laws in several states require companies to implement specific information security controls to protect certain types of information. Likewise, all but a few states have laws in place requiring companies to notify users if there is a security breach that compromises certain categories of their information. We also may be subject to certain foreign and domestic laws, such as the European General Data Protection Regulation, regarding privacy of listener data, among other things. Our privacy policy and terms of use describe our practices concerning the use, transmission and disclosure of listener information and are posted on our website.

Sales and Marketing

We organize our sales force into multiple geographically-based teams that are each focused on selling advertising across our computer, mobile and other connected device platforms. Teams are located in our Oakland, California headquarters and in regional and local sales offices throughout the United States.

Our marketing team is charged with using all forms of communications to reach our business and reputational goals. Prior to our reorganization, the marketing team was organized into four groups focused on campaign planning and analytics, consumer marketing, communications and our Music Makers Group. As part of the reorganization, the marketing team will increase their focus on listeners, drive marketing effectiveness and efficiency of spend and improve collaboration with advertisers. While we have historically relied on the success of viral marketing to expand consumer awareness of our service, in recent years we have launched marketing and advertising campaigns to increase consumer awareness of our brand and expand our listener base. We anticipate that we will continue to utilize these types of campaigns in the future.

Artist Relations

Industry Relations and Artist Marketing

Industry Relations and Artist Marketing, formerly the Music Makers Group, is a team that works directly with the music industry to help drive connections with fans across all channels at Pandora. Our vision is to ensure artists can promote and market their music to fans, drive engagement with experiences from live events to original content and audio messages to fans and understand all of the benefits of these interactions via our analytics tools.

Pandora Artist Marketing Platform

Pandora AMP consists of products and programs that enable music makers to leverage data to grow an audience, track progress and connect with fans on Pandora. Since its original launch focusing on artist data and insights in 2014, AMP has evolved into a set of powerful self-serve marketing tools including Artist Audio Messaging, AMPcast and Featured Tracks. Additional features of AMP, which include a dynamic feed of an artist’s campaign, performance metrics and suggestions for new campaigns, were launched in October 2016 alongside a data integration with NBS, shifting artist insights and analytics to the NBS platform and enhancing the set of desktop and mobile marketing tools offered via AMP.

Derived from tens of billions of hours of personalized listening on Pandora, the marketing tools on AMP along with the analytics tools on NBS are available to all artists spinning on Pandora and their teams. Additionally, enterprise-level tools and marketing opportunities are available to artist and label teams who have opted into a direct deal with Pandora.

Competition

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Competition for Listeners

We compete for the time and attention of our listeners with other content providers on the basis of a number of factors, including quality of experience, relevance, acceptance and perception of content quality, ease of use, price, accessibility, perceptions of ad load on our ad-supported service, brand awareness and reputation. We also compete for listeners on the basis of our presence, branding and visibility as compared with other providers that deliver content through the internet, mobile devices and consumer products. We believe that we compete favorably on these factors. For additional details on risks related to competition for listeners, please refer to Item 1A—"Risk Factors".

Many of our current and potential future competitors enjoy competitive advantages, such as greater name recognition, legacy operating histories and larger marketing budgets, as well as greater financial, technical and other resources. We compete with many forms of digital media for the time and attention of our listeners.

We also compete for listeners with broadcast radio providers, including terrestrial radio providers. Many broadcast radio conglomerates own large numbers of radio stations or other media properties. Many terrestrial radio stations broadcast digital signals, which provide high quality audio transmission.

We also face competition for listeners and listener hours from on-demand music streaming services such as Amazon Prime, Apple Music, Google Play Music, Spotify and YouTube. These services offer consumers the ability to choose the songs and artists they want to hear and create customized playlists. With the launch of Pandora Premium in April 2017, we are now able to compete more directly against these other services. Our ability to attract and retain listeners may be dependent on the success of this service and our ability to market the service effectively. This on-demand content is accessible in automobiles and homes, using portable players, mobile phones and other wireless and consumer electronic devices. The audio entertainment marketplace continues to rapidly evolve, providing our listeners with a growing number of alternatives and new media platforms. Certain technology companies that operate music streaming businesses as an ancillary revenue stream generally enjoy an advantage in that they do not rely on their music streaming services to generate profitability. In addition, they are able to favor their own music services within the devices they sell, helping to increase their listener base from existing consumers, making their music services fast growing segments. Apple, Google and Amazon are examples of competitors of this kind.

At a macro level, we compete for the time and attention of our listeners with providers of other forms of in-home and mobile entertainment. To the extent existing or potential listeners choose to watch cable television, stream video from on-demand services or play interactive video games on their home-entertainment system, computer or mobile phone rather than listen to the Pandora service, these content services pose an adjacent competitive threat for consumer time and mindshare.

Competition for Advertisers

We compete with traditional media products and services, and with other internet-based services, for a share of our advertising customers' overall marketing budgets. We compete on the basis of a number of factors, including perceived return on investment, effectiveness and relevance of our advertising products, pricing structure, the ability to deliver large volumes or precise types of ads to targeted demographics, transactional capabilities and reporting capabilities. We believe that our ability to deliver targeted and relevant ads across a wide range of platforms allows us to compete favorably on the basis of these factors and justify a long-term profitable pricing structure. However, the market for online advertising is intensely competitive and rapidly changing, and with the introduction of new technologies and market entrants, we expect competition to intensify in the future.

Advertisers are allocating increasing amounts of their overall marketing budgets to online advertising, yet the market for online advertising has also become increasingly competitive. We compete for online advertisers with other internet companies, including major internet portals, search engine companies and social media sites. Large internet companies with greater brand recognition have significant numbers of direct sales personnel, more advanced programmatic advertising capabilities and substantial proprietary advertising inventory and web traffic that provide a significant competitive advantage and have a significant impact on pricing for internet advertising and web traffic.

Terrestrial radio is a source of competition for advertising dollars. Broadcast radio providers deliver ads across a more familiar platform than the internet may be to traditional advertisers.

Our competitors include large scale online advertising platforms such as Amazon, Facebook, Google and traditional media companies such as large television broadcasters and national print outlets. We directly compete against Cumulus, Entercom, iHeartRadio, Spotify and other companies in the traditional broadcast radio market. For additional details on risks related to competition for advertisers, please refer to Item 1A—"Risk Factors".

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Seasonality

Pandora—Streaming Radio and On-Demand Music Services

Our results reflect the effects of seasonal trends in listener and advertising behavior. During the last quarter of each calendar year, and particularly during the holiday season, we expect to experience both higher advertising sales due to greater advertiser demand during the holiday season and increased usage of our service due to the popularity of holiday music. In addition, in the first quarter of each calendar year, we expect to experience lower advertising sales due to reduced advertiser demand, but sustain higher levels of usage by listeners due to increased use of media-streaming devices received as gifts during the holiday season. See the section entitled "Business Trends" in Item 7 of this Annual Report on Form 10-K for a more complete description of the seasonality of our financial results.

Intellectual Property

Our success depends in part upon our ability to protect our technologies and intellectual property. To accomplish this, we rely on a combination of intellectual property rights, including trade secrets, patents, copyrights, trademarks, contractual restrictions, technological measures and other methods. We enter into confidentiality and proprietary rights agreements with our employees, consultants and business partners, and we control access to and distribution of our technology and proprietary information.

We have filed and acquired dozens of active patent applications and issued patents in the United States and other countries. We continue to pursue additional patent protection, both in the United States and abroad where appropriate and cost effective. We intend to hold these patents as part of our strategy to protect and defend Pandora in patent-related litigation. We also acquire patents and patent applications from time to time as part of other transactions.

Our registered trademarks in the United States include "Pandora," "Ampcast," "Comedy Genome Project" and the "Music Genome Project," in addition to a number of Pandora logos and other marks. "Pandora" is also registered in Australia, Canada, Chile, the European Union, India, Israel, Mexico, New Zealand, Switzerland, Taiwan and other countries. "Music Genome Project" is also registered in Australia, Canada, China and New Zealand. We have pending trademark applications in the United States and other countries.

We are the registrant of the internet domain names for our primary website, pandora.com, as well as others related to our current and potential future businesses.

In addition to the forms of intellectual property listed above, we own rights to proprietary processes and trade secrets, including those underlying the Pandora service. We use contractual, policy and technological means to generally control access to, and the use and distribution of our proprietary software, trade secrets and other confidential information, both internally and externally, including contractual protections with employees, contractors, customers and partners.

Customer Concentration

For each of the years ended December 31, 2015, 2016 and 2017, we had no individual customers that accounted for 10% or more of total revenue.

Information About Geographic Revenue

Information about geographic revenue is set forth in Note 15 of the Notes to the Consolidated Financial Statements under Item 8 of this Annual Report on Form 10-K.

Employees

As of December 31, 2017, we had 1,938 employees. None of our employees are covered by collective bargaining agreements, and we consider our relations with our employees to be good.

Corporate and Available Information

We were incorporated as a California corporation in January 2000 and reincorporated as a Delaware corporation in December 2010. Our principal executive offices are located at 2101 Webster Street, Suite 1650, Oakland, California 94612 and

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our telephone number is (510) 451-4100. Our website is located at www.pandora.com and our Investor Relations website is located at investor.pandora.com.

We changed our fiscal year to the calendar year ending December 31, effective beginning with the period ended December 31, 2013. As a result, the period ended December 31, 2013 was shortened from a year to an eleven-month transition period.

     We file reports with the Securities and Exchange Commission ("SEC"), including Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and any other filings required by the SEC. Such reports and other information filed by us with the SEC are available free of charge on our website at investor.pandora.com when such reports are available on the SEC's website. The information on our website is not incorporated by reference into this Annual Report on Form 10-K or in any other report or document we file with the SEC.

The public may read and copy any materials we file with the SEC at the SEC's Public Reference Room at 100 F Street, NE, Washington, DC 20549. The public may obtain information on the operation of the Public Reference Room by calling the SEC at 1-800-SEC-0330. The SEC maintains an internet site that contains reports, proxy and information statements and other information regarding issuers that file electronically with the SEC at www.sec.gov.

Investors and others should note that we use our Investor Relations website, SEC filings, press releases, public conference calls and webcasts as means of disclosing material non-public information and for complying with our disclosure obligations under Regulation FD. We use these channels as well as social media to communicate with the public about the Company, our services and other issues. It is possible that the information we post on social media could be deemed to be material information. Therefore, we encourage investors, the media, and others interested in the Company to review the information we post on the social media channels listed on our Investor Relations website.

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ITEM 1A. RISK FACTORS

The risks and uncertainties set forth below, as well as other factors described elsewhere in this Annual Report on Form 10-K or in other filings by us with the SEC, could adversely affect our business, financial condition, results of operations and the trading price of our common stock. Additional risks and uncertainties that are not currently known to us or that are not currently believed by us to be material may also harm our business operations and financial results. Because of the following factors, as well as other factors affecting our financial condition and operating results, past financial performance should not be considered to be a reliable indicator of future performance, and investors should not use historical trends to anticipate results or trends in future periods.

Risks Related to Our Business

If our efforts to attract prospective listeners and to retain existing listeners are not successful, our growth prospects and revenue will be adversely affected.

Our ability to grow our business and generate advertising revenue depends on retaining and expanding our listener base and increasing listener hours. We must convince prospective listeners of the benefits of our service and existing listeners of the continuing value of our service. The more listener hours we stream, the more ad inventory we have to sell. Further, growth in our listener base increases the size of demographic pools targeted by advertisers, which improves our ability to deliver advertising in a manner that maximizes our advertising customers’ return on investment and, ultimately, to demonstrate the effectiveness of our advertising solutions and justify a pricing structure that is profitable for us. If we fail to grow our listener base and listener hours, particularly in key demographics such as young adults, we will be unable to grow advertising revenue, and our business will be materially and adversely affected.

Our ability to increase the number of our listeners and listener hours will depend on effectively addressing a number of challenges. Some of these challenges include:

• providing listeners with a consistent high quality, user-friendly and personalized experience;

• successfully expanding our share of listening in cars;

• continuing to build and maintain availability of catalogs of music and comedy and other content that our listeners enjoy;

• continuing to innovate and keep pace with changes in technology and our competitors;

• maintaining and building our relationships with makers of consumer products such as mobile devices and other consumer electronic products to make our service available through their products;

• maintaining positive listener perception of our service while managing ad-load to optimize inventory utilization; and

• minimizing listener churn and attracting lapsed listeners back to the service.

In addition, we have historically relied heavily on the success of viral marketing to expand consumer awareness of our service. We recently began supplementing our viral marketing strategy with larger, more costly marketing campaigns, and this increase in marketing expenses could fail to achieve expected returns and therefore have an adverse effect on our results of operations. We cannot guarantee that we will be successful in maintaining or expanding our listener base and failure to do so would materially and adversely affect our business, operating results and financial condition.

Further, although we use our number of active users as a key indicator of our brand awareness and the growth of our business, the number of active users exceeds the number of unique individuals who register for, or actively use, our service. We define active users as the number of distinct users that have requested audio from our servers within the trailing 30 days from the end of each calendar month. To establish an account, a person does not need to provide personally unique information. For this reason, a person may have multiple accounts. If the number of actual listeners does not result in an increase in listener hours, then our business may not grow as quickly as we expect, which may harm our business, operating results and financial condition.

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If we are unable to maintain revenue growth from our advertising products, particularly in mobile advertising, our results of operations will be materially adversely affected.

Our number of listener hours on mobile devices comprised approximately 88% of our total listener hours for the year ended December 31, 2017, and we expect that mobile listener hours will continue to be a substantial majority of our total listener hours for the foreseeable future. We must therefore continue to convince advertisers of the capabilities and value of mobile digital advertising opportunities so that they direct an increasing portion of their advertising spend toward our ad-supported service.

We continue to build our sales capability to penetrate local advertising markets, which we view as a key challenge to monetizing our listener hours, including listener hours on mobile and other connected devices. Our audio advertising capability also places us in direct competition with terrestrial radio, as many advertisers that purchase audio ads focus their spending on terrestrial radio stations who traditionally have strong connections with local advertisers. We cannot foresee whether we will be able to continue to capture local and audio advertising revenue at the current rate of growth, which may have an adverse impact on future revenue and income.

We continue to work on initiatives that, if successfully implemented, would increase our number of listener hours on mobile and other connected devices, including efforts to expand the reach of our service by making it available on a variety of devices, such as smartphones and devices connected to or installed in automobiles. In order to effectively monetize such increased listener hours, we must, among other things, convince advertisers to migrate spending to nascent advertising markets, penetrate local advertising markets and develop compelling ad product solutions. We may not be able to effectively monetize inventory generated by listeners using mobile and connected devices, or do so in a time frame that supports our business plans.

Advertising spending is increasingly being placed through new data-driven channels, such as the programmatic buying ecosystem, where our competitors offer more advanced systems and services that in many cases exceed our capabilities. We must invest heavily in advertising technology to remain competitive in the digital advertising ecosystem, and if our investments and development efforts are not successful, our business will be adversely affected.

As new advertising buying technologies, such as programmatic buying, develop around data-driven technologies and advertising products, an increasing percentage of advertising spend is likely to shift to such channels and products. These data-driven advertising products and programmatic buying technologies allow publishers to use data to target advertising toward specific groups of consumers who are more likely to be interested in the advertising message delivered. Our programmatic ad-buying systems currently lag behind those offered by market leaders—such as Google and Facebook—in terms of functionality and ease of use. We are investing heavily in developing more advanced data-driven, programmatic advertising capabilities for audio and video advertising on our service, but we cannot be sure that our development efforts will be successful or timely, or that our ad-buying systems will be competitive. If we fail to develop competitive data-driven, programmatic ad-buying services, we may experience a decline in advertiser interest in our services, which may adversely affect our advertising revenue and our business results.

Emerging industry trends in digital advertising measurement and pricing may pose challenges for our ability to forecast or optimize our advertising inventory, which may adversely impact our advertising revenue.

The digital advertising marketplace is introducing new ways to measure and price advertising inventory. Specifically, the industry is in the process of moving from purchasing ad impressions based on the number of ads served by the applicable ad server to a new “viewable” impression standard (based on number of pixels in view and duration) for select products. In the absence of a uniform industry standard, agencies and advertisers have adopted several different billing standards and measurement methodologies. In addition, measurement services may require technological integrations which are still being evaluated by the industry. As these trends in the industry continue to evolve, our advertising revenue may be adversely affected by the availability, accuracy and utility of the available analytics and measurement technologies as well as our ability to successfully implement and operationalize such technologies and standards.

Our failure to convince advertisers of the benefits of our ad-supported service in the future could harm our business.

For the year ended December 31, 2017, we derived 73% of our revenue from the sale of advertising and expect to continue to derive a substantial majority of our revenue from the sale of advertising in the future. Our ability to attract and retain advertisers, and ultimately to sell our advertising inventory to generate advertising revenue, depends on a number of factors, including:

• increasing the number of listener hours, particularly within desired demographics;

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• keeping pace with changes in technology and our competitors;

• competing effectively for advertising dollars from other online marketing and media companies;

• penetrating the market for local radio advertising;

• demonstrating the value of advertisements to reach targeted audiences across all of our delivery platforms, including the value of mobile digital advertising;

• ensuring that new ad formats and ad product offerings are attractive to advertisers and that inventory management decisions (such as changes to ad load, frequency, prominence and quality of ads that we serve listeners) do not have a negative impact on listener hours;

• continuing to develop and diversify our advertising platform, which currently includes delivery of display, audio and video advertising products through multiple delivery channels, including computers, mobile and other connected devices; and

• coping with ad blocking technologies that have been developed and are likely to continue to be developed that can block the display of our ads.

Our agreements with advertisers are generally short-term or may be terminated at any time by the advertiser. Advertisers that are spending only a small amount of their overall advertising budget on our service may view advertising with us as experimental and unproven and may leave us for competing alternatives at any time. We may never succeed in capturing a greater share of our advertisers’ core advertising spending, particularly if we are unable to achieve the scale and industry penetration necessary to demonstrate the effectiveness of our advertising platforms, or if our advertising model proves ineffective or not competitive when compared to alternatives. Failure to demonstrate the value of our service would result in reduced spending by, or loss of, existing or potential future advertisers, which would materially harm our revenue and business.

Unavailability of, or fluctuations in, third-party measurements of our audience may adversely affect our ability to grow advertising revenue.

Selling ads, locally and nationally, requires that we demonstrate to advertisers that our service has substantial reach and usage. Third-party measurement vendors' technology may not reflect our true listening audience and their underlying methodologies are subject to change at any time. In addition, the methodologies we apply to measure the key metrics that we use to monitor and manage our business may differ from the methodologies used by third-party measurement service providers. For example, we calculate listener hours based on the total bytes served for each track that is requested and served from our servers, as measured by our internal analytics systems, whether or not a listener listens to the entire track. By contrast, certain third-party measurement service providers may calculate and report the number of listener hours using a client-based approach, which measures time elapsed during listening sessions. Measurement technologies for mobile and consumer electronic devices may be even less reliable in quantifying the reach, usage and location of our service, and it is not clear whether such technologies will integrate with our systems or uniformly and comprehensively reflect the reach, usage and location of our service. While we have been working with third-party measurement service providers and certain of their measurements have earned Media Ratings Council accreditation, some providers have not yet developed uniform measurement systems that comprehensively measure the reach, usage and location of our service. In order to demonstrate to potential advertisers the benefits of our service, we supplement third-party measurement data with our internal reporting, which may be perceived as less valuable than third-party numbers. If third-party measurement providers report lower metrics than we do, or if there is wide variance among reported metrics, our ability to attract advertisers to our service could be adversely affected.

The lack of accurate cross-platform measurements for internet radio and broadcast radio may adversely affect our ability to grow advertising revenue.

We have invested substantial resources to create accurate cross-platform measurements for internet radio and broadcast radio in the major automated media-buying platforms, attempting to create a one-stop shop that enables media buyers to compare internet radio audience reach with terrestrial radio audience reach using traditional broadcast radio metrics.

Media buying agencies receive measurement metrics from third parties, such as Triton for internet radio and Nielsen for more traditional media like terrestrial radio and television. Media buying agencies may choose not to show, or may be prohibited by contract from showing, internet radio metrics alongside traditional terrestrial metrics. Despite our efforts to

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achieve parity within the tools available to media buying agencies, a lack of comparable internet radio metrics in these buying tools could have a materially negative effect on our ability to sell advertising on our service and achieve our revenue goals.

If we are unable to continue to make our technology compatible with the technologies of third-party distribution partners who make our service available to our listeners through mobile devices, consumer electronic products and automobiles, we may not remain competitive and our business may fail to grow or decline.

In order to deliver music everywhere our listeners want to hear it, our service must be compatible with mobile, consumer electronic, automobile and website technologies. Our service is accessible in part through both Pandora-developed and third-party developed apps that hardware manufacturers embed in, and distribute through, their devices. Most of our agreements with makers of mobile operating systems and devices through which our service may be accessed, including Apple and Google, are short-term or can be canceled at any time with little or no prior notice or penalty. The loss of these agreements, or the renegotiation of these agreements on less favorable economic or other terms, could limit the reach of our service and its attractiveness to advertisers. Some of these mobile device makers and operating system providers, including Apple, Amazon, Samsung and Google, are now, or may in the future become, competitors of ours, and could stop allowing or supporting access to our service through their products for competitive reasons.

Connected devices and their underlying technologies are constantly evolving. As internet connectivity of automobiles, mobile devices and other consumer electronic products expands and as new internet-connected products are introduced, we must constantly adapt our technology. It is challenging to keep pace with the continual release of new devices and technological advances in digital media delivery. If manufacturers fail to make products that are interoperable with our technology or we fail to adapt our technology to their evolving requirements, our ability to grow or sustain the reach of our service, increase listener hours and sell advertising could be adversely affected.

Consumer tastes and preferences can change in rapid and unpredictable ways and consumer acceptance of these products depends on the marketing, technical and other efforts of third-party manufacturers, which is beyond our control. If consumers fail to accept the products of the companies with whom we partner or if we fail to establish relationships with makers of leading consumer products, our business could be adversely affected.

If we fail to accurately predict and play music, comedy or other content that our listeners enjoy, we may fail to retain existing and attract new listeners.

We believe that a key differentiating factor between the Pandora service and other music content providers is our ability to predict music that our listeners will enjoy. Our personalized playlist generating system, based on the Music Genome Project and our proprietary algorithms, is designed to enable us to predict listener music preferences and select music content tailored to our listeners’ individual music tastes. We have invested, and will continue to invest, significant resources in refining these technologies; however, we cannot guarantee that such investments will produce the intended results. The effectiveness of our personalized playlist generating system depends in part on our ability to gather and effectively analyze large amounts of listener data and listener feedback and we have no assurance that we will continue to be successful in enticing listeners to give a thumbs-up or thumbs-down to enough songs for our database to effectively predict and select new and existing songs. In addition, our ability to offer listeners songs that they have not previously heard and impart a sense of discovery depends on our ability to acquire and appropriately categorize additional tracks that will appeal to our listeners’ diverse and changing tastes. While we have over 1.5 million analyzed songs in our library, we must continuously identify and analyze additional tracks that our listeners will enjoy and we may not effectively do so. Further, many of our competitors currently have larger catalogs than we offer and they may be more effective in providing their listeners with a more appealing listener experience.

We also provide comedy content on Pandora, and for that content we also try to predict what our listeners will enjoy, using technology similar to the technology that we use to generate personalized playlists for music. The risks that apply to predicting our listeners’ musical tastes apply to comedy and other content to an even greater extent, particularly as we lack experience with content other than music, do not yet have as large a data set on listener preferences for comedy and other content, and have a much smaller catalog as compared to music. Our ability to predict and select music, comedy and other content that our listeners enjoy is critical to the perceived value of our service among listeners and failure to make accurate predictions would adversely affect our ability to attract and retain listeners, increase listener hours and sell advertising.

We face, and will continue to face, competition with other content providers for listener hours and advertising spending.

We compete for the time and attention of our listeners with other content providers on the basis of a number of factors, including quality of experience, relevance, acceptance and perception of content quality, ease of use, price, accessibility,

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perception of ad load, brand awareness and reputation. Such competition affects the amount of quality advertising inventory available which we can offer to advertisers on our ad-supported service.

Many of our competitors may leverage their existing infrastructure, brand recognition and content collections to augment their services by offering competing internet radio features within a more comprehensive digital music streaming service. We face increasing competition for listeners from a growing variety of music services that deliver music content through mobile phones and other wireless devices. Our competitors include traditional broadcast and internet radio services and other terrestrial radio companies. We also directly compete with the non-interactive, internet radio offerings from providers such as Amazon Prime, Apple Music, Google Play Music and Spotify.

Our competitors also include terrestrial radio services, many of which also broadcast on the internet. Terrestrial radio providers offer their content for free, are well established and accessible to listeners and offer content, such as news, sports, traffic, weather and talk that we currently do not offer. In addition, many terrestrial radio stations have begun broadcasting digital signals, which provide high-quality audio transmission. We also compete directly with other emerging non-interactive internet radio providers, which may offer more extensive content libraries than we offer and some of which may be accessed internationally.

We compete for the time and attention of our listeners with providers of other forms of in-home and mobile entertainment. To the extent existing or potential listeners choose to watch cable television, stream video from on-demand services or play interactive video games on their home-entertainment system, computer or mobile phone rather than listen to the Pandora service, these content services pose a competitive threat. We also compete with many other forms of media and services for the time and attention of our listeners, including large scale online advertising platforms such as Amazon, Facebook and Google and traditional media companies such as large television broadcasters and national print outlets.

We believe that companies with a combination of financial resources, technical expertise and digital media experience also pose a significant threat. For example, Apple, Amazon and Google operate competing services. These and other competitors may devote greater resources than we have available, have a more accelerated time frame for deployment, be willing to absorb significant costs to acquire customers through free trials or other initiatives, operate their music services at a loss in order to drive their other profitable businesses, and leverage their existing user base and proprietary technologies to provide products and services that our listeners and advertisers may view as superior or more cost effective. Our current and future competitors may have more well established brand recognition, more established relationships with music content companies and consumer product manufacturers, greater financial, technical and other resources, more sophisticated technologies or more experience in the markets, both domestic and international, in which we compete.

We also compete for listeners on the basis of the presence and visibility of our app, which is distributed via the largest app stores operated by Apple, Google and Amazon. Such distribution is subject to an application developer license agreement in each case. We face significant competition for listeners from these companies, who are also promoting their own digital music and content online through their app stores. Search engines and app stores rank responses to search queries based on the popularity of a website or mobile application, as well as other factors that are outside of our control. Additionally, app stores often offer users the ability to browse applications by various criteria, such as the number of downloads in a given time period, the length of time since a mobile app was released or updated, or the category in which the application is placed. The websites and mobile applications of our competitors may rank higher than our website and our Pandora app, and our app may be difficult to locate in app stores, which could draw potential listeners away from our service and toward those of our competitors. In addition, our competitors’ products may be pre-loaded or integrated into consumer electronics products or automobiles, creating an initial visibility advantage. If we are unable to compete successfully for listeners against other digital media providers by maintaining and increasing our presence and visibility online, in app stores and in consumer electronics products and automobiles, our listener hours may fail to increase as expected or decline and our business may suffer. Additionally, should any of these parties reject our app from their app store or amend the terms of their license in such a way that inhibits our ability to distribute our apps, or negatively affects our economics in such distribution, our ability to increase ad-supported listener hours and sell advertising would be adversely affected, which would reduce our revenue and harm our operating results.

To compete effectively, we must continue to invest significant resources in the development of our service to enhance the user experience of our listeners.

Additionally, in order to compete successfully for advertisers against new and existing competitors, we must continue to invest resources in developing and diversifying our advertisement platform, harnessing listener data and ultimately proving the effectiveness and relevance of our advertising products. There can be no assurance that we will be able to compete successfully for listeners and advertisers in the future against existing or new competitors, and failure to do so could result in loss of existing

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or potential listeners, loss of current or potential advertisers or a reduced share of our advertisers’ overall marketing budget, which could adversely affect our pricing and margins, lower our revenue, increase our research and development and marketing expenses, diminish our brand strength and prevent us from achieving or maintaining profitability.

Our ability to increase the number of our listeners will depend in part on our ability to establish and maintain relationships with automakers, automotive suppliers and consumer electronics manufacturers with products that integrate our service.

A key element of our strategy to expand the reach of our service and increase the number of our listeners and listener hours is to establish and maintain relationships with automakers, automotive suppliers and consumer electronics manufacturers that integrate our service into and with their products. Working with certain third-party distribution partners, we currently offer listeners the ability to access our service through a variety of consumer electronics products used in the home and devices connected to or installed in automobiles. We intend to broaden our ability to reach additional listeners, and increase current listener hours, through other platforms and partners over time, including through direct integration into connected cars. However, product design cycles in consumer products and automotive manufacturing are lengthy, and we may not be able to achieve our goals in our desired timeframe, which could adversely impact our ability to grow our business.

Our existing agreements with partners in the automobile and consumer electronics industries generally do not obligate those partners to offer our service in their products. In addition, some automobile manufacturers or their supplier partners may terminate their agreements with us for convenience. Our business could be adversely affected if our automobile partners and consumer electronics partners do not continue to provide access to our service or are unwilling to do so on terms acceptable to us. If we are forced to amend the business terms of our distribution agreements as a result of competitive pressure, our ability to maintain and expand the reach of our service and increase listener hours would be adversely affected, which would reduce our revenue and harm our operating results.

If our efforts to attract and retain subscribers or convert ad-supported listeners into subscribers of our subscription offerings are not successful, our business will be adversely affected.

Our ability to continue to attract and retain users of our paid subscription services will depend in part on our ability to consistently provide our subscribers with a quality experience through Pandora Plus and Pandora Premium. If Pandora Plus and Pandora Premium subscribers do not perceive these offerings to be of value, or if we introduce new or adjust existing features or pricing in a manner that is not favorably received by them, we may not be able to attract and retain subscribers or be able to convince listeners to become subscribers of such additional service offerings. Subscribers may cancel their subscription to our service for many reasons, including a perception that they do not use the service sufficiently, the need to cut household expenses, competitive services that provide a better value or experience or as a result in changes in pricing. Further, in a number of cases, the rates that we pay pursuant to our direct license agreements with record labels are significantly affected by the number of subscribers we are able to attract and retain. If our efforts to attract and retain subscribers are not successful, our business, operating results and financial condition may be adversely affected.

Our ability to offer interactive features in our services depends upon maintaining commercially viable direct licenses with copyright owners of the music we play. If we are not able to maintain these direct licenses, we could lose the right to provide interactive features in our ad-supported service and Pandora Plus and the right to operate Pandora Premium. If we are not able to renew these direct licenses on similar terms when they expire, our profitability may be negatively affected.

We have direct license agreements with dozens of music sound recording copyright owners, commonly known as "record labels", with thousands of musical work copyright owners, commonly known as "publishers", and with ASCAP, BMI and SESAC, the three largest performing rights organizations, commonly known as "PROs". In total, these agreements give us the right to add interactive features such as replays, additional skips and offline play to our ad-supported service and Pandora Plus, and they also give us the right to operate Pandora Premium. The direct licenses we have entered into with record labels and publishers are complex and require significant on-going efforts to operationalize, and there is risk that we may not be able to comply with the terms of these licenses, which could result in the loss of some or all of these licenses and some or all of the rights they convey. Similarly, many of these licenses provide that if the licensor loses rights in a portion of the content licensed under the agreement, that content may be removed from the license going-forward. In addition, if we are acquired, certain terms of our direct licenses, including favorable rates for content acquisition costs that currently apply to us, may not be available to an acquiror. If we were to fail to maintain any of these direct licenses, or if rights to certain music were no longer available under these licenses, then we may have to remove the affected music from our services, or discontinue certain interactive features for such music, or it might become commercially impractical for us to operate Pandora Premium. Any of these occurrences could have a material adverse effect on our business, financial condition and results of operations.

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Several of these direct licenses also include provisions related to the royalty payments and structures of those agreements relative to other content licensing arrangements, which, if breached, could cause our payments under those agreements to escalate substantially. In addition, record labels, publishers and PROs with whom we have entered into direct licenses have the right to audit our content acquisition payments, and any such audit could result in disputes over whether we have paid the proper content acquisition costs. If such a dispute were to occur, we could be required to pay additional content acquisition costs, audit fees and interest or penalties, and the amounts involved could materially and adversely affect our business, financial condition and results of operations.

Further, there is no guarantee that the direct licenses we have now will be renewed in the future or that such licenses will be available at the rates for content acquisition costs associated with the current licenses. If we are unable to secure and maintain direct licenses for the rights to provide music on our services at rates that are similar to those under our current direct licenses, or other commercially viable rates, our content costs could rise and materially adversely affect our business, financial condition and results of operations.

Minimum guarantees required under certain of our music license agreements may limit our operating flexibility and could adversely affect our liquidity and results of operations.

As described in "Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Note 11, Commitments and Contingencies", certain of our music license agreements contain minimum guarantees and require that we make upfront minimum guarantee payments. As of December 31, 2017, we have future minimum guarantee commitments of $405.2 million. Such minimum guarantees related to our content acquisition costs are not tied to our number of subscribers, active users or the number of sound recordings used on our services. As such, our ability to achieve and sustain profitability and operating leverage on our services depends on our ability to increase our revenue through increased paid subscriptions and advertising sales on terms that maintain an adequate gross margin. Given the multiple-year duration and largely fixed cost nature of these minimum guarantees, if subscriber acquisition and retention or advertising sales do not meet our expectations, our margins may be materially and adversely affected. To the extent subscriber and subscription revenue growth or advertising sales do not meet our expectations, our liquidity and results of operations could also be adversely affected as a result of such minimum guarantees. In addition, the long-term and fixed cost nature of these minimum guarantees may limit our flexibility in planning for, or reacting to, changes in our business and the market segments in which we operate.

We rely on estimates of the market share of licensable content controlled by each content provider to forecast whether such minimum guarantees will be recoupable against our actual content acquisition costs incurred over the duration of the license agreement. To the extent that these market share estimates are incorrect and our actual content acquisition costs for a particular content provider is less than the amount of the minimum guarantee, our margins may be materially and adversely affected.

The rates we must pay for "mechanical rights" to use musical works on our services are set by the Copyright Royalty Board, which is currently in the process of determining these rates for the five-year period beginning January 1, 2018. If these rates increase significantly, it will adversely affect our business.

Our direct licenses with thousands of music publishers provide that the content acquisition payments for "reproduction rights" or "mechanical rights"—which are implicated in the interactive features of our Pandora Plus service, as well as in the operation of Pandora Premium—are determined in accordance with the rate formula set by the Copyright Royalty Board for the compulsory license made available by Section 115 of the Copyright Act. Further, these rates are also applicable to our use of musical works for which we do not have a direct license with the copyright owners. The current rate structure for the Section 115 compulsory license expired at the end of 2017. The Copyright Royalty Board has rendered its initial determination of the new rate formula that will be applicable from January 1, 2018 through December 31, 2022 (the "Initial Determination"). If the Copyright Royalty Board adopts and affirms its Initial Determination, the "all-in" rate that streaming services, including Pandora, will pay to music publishers and songwriters for the mechanical rights and performance rights needed in connection with interactive streaming will increase annually between 2018 and 2022, with a total increase over that period of 32%. Certain per-subscriber minimums also apply depending on the type of service. If the Initial Determination is adopted and affirmed, and is not revised through an appeals process, our content acquisition costs will significantly increase, which could materially harm our financial condition and hinder our ability to provide interactive features in our services, or cause one or more of our subscription services to not be commercially viable.

If we are unsuccessful at operating Pandora Premium, our on-demand subscription offering, our business may be adversely affected.

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The development and launch of our Pandora Plus and Pandora Premium service offerings has required and will continue to require significant engineering as well as marketing and other resources. In addition, to support the launch of these services we have entered into direct license agreements with the major record labels and publishers, several of which entail substantial minimum guaranteed content acquisition cost payments by us. There is no assurance that we will be able to successfully operate Pandora Premium, or obtain and maintain the content license rights to enable the continued offering of Pandora Plus and Pandora Premium. Further, in a number of cases, the rates for content acquisition costs payable under certain of our direct license agreements with record labels are significantly affected by the number of subscribers we are able to attract and retain to our subscription services, including Pandora Premium. If we fail to successfully operate Pandora Plus and/or Pandora Premium, or if we are not able to attract sufficient paying subscribers to those services, we will not realize the benefits of the substantial investment made in the development of these product offerings.

Our inability to obtain accurate and comprehensive information necessary to identify the ownership of sound recordings and musical works used on our services may impact our ability to perform our obligations under our licenses from the copyright holders, may require us to remove or decrease the number of performances of certain music on our services, and may subject us to potential copyright infringement claims and difficulties in controlling content acquisition costs.

We currently rely on the assistance of third parties to determine comprehensive and accurate rightsholder information for the sound recordings and the musical works underlying the sound recordings that we use on our services. If the information provided to us does not comprehensively or accurately identify which labels, artists, composers, songwriters or publishers own or administer sound recordings or musical works, or if we are unable to determine which musical works correspond to specific sound recordings, it may be difficult to identify the appropriate rightsholders to pay under our direct licenses, and it may also be difficult to comply with other obligations under those agreements. Further, our inability to accurately identify rights holders may prevent us from obtaining necessary additional licenses, which could lead to a reduction in the music available to stream on our service, adversely impacting our ability to retain and expand our listener base. Such a lack of ownership data may also make it difficult to identify the sound recordings that we should remove from our service, which may subject us to significant liability for copyright infringement.

We also rely on the assistance of third parties to provide notices of intent ("NOIs") for a compulsory license under Section 115 of the Copyright Act to those copyright owners with whom we do not have a direct license agreement or whose contact information is unavailable or unknown. If the third parties on which we rely do not provide NOIs to the correct parties (including the United States Copyright Office for unknown copyright owners), or to all parties who should receive an NOI, or do not serve the NOI in a timely manner, we may be subject to significant liability for copyright infringement.

Expansion of our operations into content beyond pre-recorded music, including comedy and podcasts, subjects us to additional business, legal, financial and competitive risks.

Expansion of our operations into delivery of content beyond pre-recorded music involves numerous risks and challenges, including increased capital requirements, new competitors and the need to develop new strategic relationships. Growth into these new areas may require changes to our existing business model and cost structure, modifications to our infrastructure and exposure to new regulatory and legal risks, including infringement liability, any of which may require additional expertise that we currently do not have. There is no guarantee that we will be able to generate sufficient revenue from advertising sales associated with comedy, podcasts or other non-prerecorded-music content to offset the costs of acquiring this content. Further, we have established a reputation as a music format internet radio provider and our ability to gain acceptance and listenership for comedy, podcasts or other non-music content, and thus our ability to attract advertisers to this content, is not certain. Failure to obtain or retain rights to comedy, podcasts or other non-music content on acceptable terms, or at all, to successfully monetize and generate revenues from such content, or to effectively manage the numerous risks and challenges associated with such expansion could adversely affect our business and financial condition.

We are not able to obtain licenses for the underlying literary works for the sound recordings of spoken-word comedy content that we stream. Third parties could assert copyright claims against us as a result.

We stream spoken word comedy content, for which the underlying literary works are not currently entitled to eligibility for licensing by any performing rights organization in the United States. Rather, pursuant to industry-wide custom and practice, this content is performed absent a specific license from any such performing rights organization or individual rights owners, although content acquisition costs are paid to SoundExchange for the public performance of the sound recordings in which such literary works are embodied. There can be no assurance that this industry custom will not change or that we will not otherwise become subject to additional licensing costs for spoken word comedy content imposed by performing rights organizations or individual copyright owners in the future or be subject to claims of copyright infringement.

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We may require additional capital to pursue our business objectives and respond to business opportunities, challenges or unforeseen circumstances. If capital is not available to us, our business, operating results and financial condition may be harmed.

Some of our current or future strategic initiatives may require substantial additional capital resources before they begin to generate revenue. Additional funds may not be available when we need them, on terms that are acceptable to us, or at all. For example, our current credit facility contains restrictive covenants relating to our capital raising activities and other financial and operational matters, and any debt financing secured by us in the future could involve further restrictive covenants, which may make it more difficult for us to obtain additional capital and to pursue business opportunities. In addition, volatility in the credit markets may have an adverse effect on our ability to obtain debt financing. If we do not have funds available to enhance the Pandora service, maintain the competitiveness of our technology and pursue business opportunities, we may not be able to service our existing listeners, acquire new listeners or attract or retain advertising customers, each of which could inhibit the implementation of our business plan and materially harm our operating results.

Our ability to expand our services into countries outside the United States is dependent on our ability to obtain necessary licenses from content owners, which we currently do not have.

We currently only operate the Pandora service in the United States. In order to launch any interactive or non-interactive music streaming service anywhere else in the world, we will need to negotiate and execute license agreements with the necessary rights holders, as there is no statutory licensing regime for digital streaming of music content available outside of the United States. We may not be able to obtain all of the necessary rights to expand our service offerings on commercially viable terms, or at all. If we are not able to obtain the necessary licenses on commercially viable terms, then we will not be able to expand our service internationally, and our growth could suffer materially. This could adversely affect our business, financial condition and results of operations.

We face many risks associated with our long-term plan to further expand our operations outside of the United States.

Expanding our operations into international markets is an element of our long-term strategy. However, offering our services outside of the United States involves numerous risks and challenges. Addressing content-licensing and other business issues in foreign jurisdictions may require a significant investments of time, capital and other resources by us, and there can be no assurance that we would succeed or achieve any return on these investments.

In addition, international expansion exposes us to other risks such as:

• the need to modify our technology and market our service in non-English speaking countries;

• the need to localize our service to foreign customers’ preferences and customs;

• the need to conform our operations, and our marketing and advertising efforts, with the laws and regulations of foreign jurisdictions, including, but not limited to, the use of any personal information about our listeners;

• the need to amend existing agreements and to enter into new agreements with automakers, automotive suppliers, consumer electronics manufacturers with products that integrate our service, and others in order to provide that service in foreign countries;

• difficulties in managing operations due to language barriers, distance, staffing, cultural differences and business infrastructure constraints and domestic laws regulating corporations that operate internationally;

• our lack of experience in marketing, and encouraging viral marketing growth without incurring significant marketing expenses, in foreign countries;

• application of foreign laws and regulations to us;

• fluctuations in currency exchange rates;

• reduced or ineffective protection of our intellectual property rights in some countries; and

• potential adverse tax consequences associated with foreign operations and revenue.

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Furthermore, in most international markets, we would not be the first entrant, and our competitors may be better positioned than we are to succeed. In addition, in jurisdictions where copyright protection has been insufficient to protect against widespread music piracy, achieving market acceptance of our service may prove difficult as we would need to convince listeners to stream our service when they could otherwise download the same music for free. As a result of these obstacles, we may find it impossible or prohibitively expensive to enter or sustain our presence in foreign markets, or entry into foreign markets could be delayed, which could hinder our ability to grow our business.

We have engaged and may in the future engage in the acquisition or disposition of other companies, technologies and businesses, which could divert our management’s attention, result in additional dilution to our stockholders and otherwise disrupt our operations and harm our operating results.

We have recently acquired and may in the future seek to acquire or invest in businesses, products or technologies that we believe could complement or expand our service, enhance our technical capabilities or otherwise offer growth opportunities. For example, in 2015, we acquired Next Big Sound, Ticketfly and certain assets of Rdio. These acquisitions, and our pursuit of future potential acquisitions, may divert the attention of management and cause us to incur various expenses in identifying, investigating and pursuing suitable acquisitions, whether or not they are consummated. In addition, we have limited experience acquiring and integrating other businesses. We may be unsuccessful in integrating our acquired businesses or any additional business we may acquire in the future or may not otherwise realize anticipated benefits of past or future acquisitions. For example, in September 2017, we sold Ticketfly at a significant loss.

We also may not achieve the anticipated benefits from any acquired business due to a number of factors, including:

• unanticipated costs or liabilities associated with the acquisition;

• incurrence of acquisition-related costs;

• diversion of management’s attention from other business concerns;

• regulatory uncertainties;

• harm to our existing business relationships with business partners and advertisers as a result of the acquisition;

• harm to our brand and reputation;

• the potential loss of key employees;

• use of resources that are needed in other parts of our business; and

• use of substantial portions of our available cash to consummate the acquisition.

In addition, a significant portion of the purchase price of companies we acquire may be allocated to acquired goodwill and other intangible assets, which must be assessed for impairment at least annually. In the future, if our acquisitions do not yield expected returns, we may be required to take charges to our operating results based on this impairment assessment process. Acquisitions could also result in dilutive issuances of equity securities or the incurrence of debt, which could adversely affect our operating results. In addition, if an acquired business fails to meet our expectations, our operating results, business and financial condition may suffer.

In 2017, we concluded that operating Ticketfly would no longer be part of our strategy, and as such we sold Ticketfly to a third party. The sale price in the disposition of Ticketfly was substantially less that we paid to acquire Ticketfly in 2015. The disposition also required significant attention by our management and board of directors and caused us to incur significant expenses related to the sale. While we entered into a commercial arrangement with the purchaser that we anticipate will afford us some of the benefits we had sought to obtain when we purchased Ticketfly, we may not realize the expected benefits of this commercial agreement. Further, we will be subject to potential liability for indemnities we have agreed to in the sale agreement.

We rely upon an agreement with DoubleClick, which is owned by Google, for delivering and monitoring most of our ads. Failure to renew the agreement on favorable terms, or termination of the agreement, could adversely affect our business.

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We use DoubleClick’s ad-serving platform to deliver and monitor most of the ads for our ad-supported service. There can be no assurance that our agreement with DoubleClick, which is owned by Google, will be extended or renewed upon expiration, that we will be able to extend or renew our agreement with DoubleClick on terms and conditions favorable to us or that we could identify another alternative vendor or develop our own technology to take its place. Our agreement with DoubleClick also allows DoubleClick to terminate our relationship before the expiration of the agreement on the occurrence of certain events, including material breach of the agreement by us, and to suspend provision of the services if DoubleClick determines that our use of its service violates certain security, technology or content standards.

We rely on third parties to provide software and related services necessary for the operation of our business.

We incorporate and include third-party software into and with our apps and service offerings and expect to continue to do so. The operation of our apps and service offerings could be impaired if errors occur in the third-party software that we use. It may be more difficult for us to correct any defects in third-party software because the development and maintenance of the software is not within our control. Accordingly, our business could be adversely affected in the event of any errors in this software. There can be no assurance that any third-party licensors will continue to make their software available to us on acceptable terms, to invest the appropriate levels of resources in their software to maintain and enhance its capabilities, or to remain in business. Any impairment in our relationship with these third-party licensors could harm our ability to maintain and expand the reach of our service, increase listener hours and sell advertising, each of which could harm our operating results, cash flow and financial condition.

Digital music streaming is an evolving industry, which makes it difficult to evaluate our near- and long-term business prospects.

Digital music streaming continues to develop as an industry and our near- and long-term business prospects are difficult to evaluate. The marketplace for digital music streaming is subject to significant challenges and new competitors. As a result, the future revenue, income and growth potential of our business is uncertain. Investors should consider our business and prospects in light of the risks and difficulties we encounter in this evolving business, which risks and difficulties include, among others, risks related to:

• our evolving business model and new licensing models for content as well as the potential need for additional types of content;

• our ability to develop additional products and services, or products and services in adjacent markets, in order to maintain revenue growth, and the resource requirements of doing so;

• our ability to retain current levels of active listeners, build our listener base and increase listener hours;

• our ability to effectively monetize listener hours by growing our sales of advertising inventory created from developing new and compelling ad product solutions that successfully deliver advertisers’ messages across the range of our delivery platforms while maintaining our listener experience;

• our ability to attract new advertisers, retain existing advertisers and prove to advertisers that our advertising platform is effective enough to justify a pricing structure that is profitable for us;

• our ability to maintain relationships with platform providers, makers of mobile devices, consumer electronic products and automobiles; and

• our ability to continue to secure the rights to music and other content that attracts listeners to the service on fair and reasonable economic terms.

Failure to successfully address these risks and difficulties and other challenges associated with operating in an evolving marketplace could materially and adversely affect our business, financial condition and results of operations.

We have incurred significant operating losses in the past and may not be able to generate sufficient revenue to be profitable.

Since our inception in 2000, we have incurred significant net operating losses and, as of December 31, 2017, we had an accumulated deficit of $1.3 billion. A key element of our strategy is to increase the number of listeners and listener hours to increase our industry penetration, including the number of listener hours on mobile and other connected devices. However, as our number of listener hours increases, our content acquisition costs also increase. In addition, we have adopted a strategy to

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invest in our operations in advance of, and to drive, future revenue growth. This strategy includes recently completed acquisitions and other initiatives. As a result of these trends, we have not in the past generated, and may not in the future generate, sufficient revenue from the sale of advertising and subscriptions, or new revenue sources, to offset our expenses. In addition, we plan to continue to invest heavily in our operations to restart growth. As a result of these factors, we expect to incur annual net losses in the near term.

Our revenue increased rapidly in some historical periods, but the growth rate has slowed in recent periods. We do not expect to sustain our high revenue growth rates in the future as a result of a variety of factors, including increased competition and the maturation of our business, and we cannot guarantee that our revenue will continue to grow or will not decline. Investors should not consider our historical revenue growth or operating expenses as indicative of our future performance. If revenue growth is lower than our expectations, or our operating expenses exceed our expectations, our financial performance will be adversely affected. Further, if our future growth and operating performance fail to meet investor or analyst expectations, it could have a material adverse effect on our stock price.

If we fail to effectively manage our growth, our business and operating results may suffer.

Our rapid growth has placed, and will continue to place, significant demands on our management and our operational and financial infrastructure. In order to attain and maintain profitability, we will need to recruit, integrate and retain skilled and experienced sales personnel who can demonstrate our value proposition to advertisers and increase the monetization of listener hours, particularly on mobile devices, by developing relationships with both national and local advertisers to convince them to migrate advertising spending to online and mobile digital advertising markets and utilize our advertising product solutions. Continued growth could also strain our ability to maintain reliable service levels for our listeners, effectively monetize our listener hours, develop and improve our operational, financial and management controls and enhance our reporting systems and procedures. If our systems do not evolve to meet the increased demands placed on us by an increasing number of advertisers, we may also be unable to meet our obligations under advertising agreements with respect to the timing of our delivery of advertising or other performance obligations. As our operations grow in size, scope and complexity, we will need to improve and upgrade our systems and infrastructure, which will require significant expenditures and allocation of valuable management resources. If we fail to maintain the necessary level of discipline and efficiency and allocate limited resources effectively in our organization as it grows, our business, operating results and financial condition may suffer.

Our business and prospects depend on the strength of our brands and failure to maintain and enhance our brands would harm our ability to expand our base of listeners, advertisers and other partners.

Maintaining and enhancing the "Pandora" and "Next Big Sound" brands is critical to expanding our base of listeners, advertisers, content owners and other partners. Maintaining and enhancing our brands will depend largely on our ability to continue to develop and provide an innovative and high quality experience for our listeners and attract advertisers, content owners, and automobile, mobile device and other consumer electronic product manufacturers to work with us, which we may not do successfully.

Our brands may be impaired by a number of other factors, including service outages, data privacy and security issues, listener perception of ad load and exploitation of our trademarks by others without permission. In addition, if our partners fail to maintain high standards for products that integrate our service, or if we partner with manufacturers of products that our listeners reject, the strength of our brand could be adversely affected.

Assertions by third parties of violations under state law with respect to the public performance and reproduction of pre-1972 sound recordings could result in significant costs and substantially harm our business and operating results.

Federal copyright protection does not apply to sound recordings created prior to February 15, 1972 ("pre-1972 sound recordings"). The protection of such recordings is instead governed by a patchwork of state statutory and common laws. Copyright owners of pre-1972 sound recordings have brought litigation against us in a number of states, alleging violations of state statutory and common laws arising from the reproduction and public performance of pre-1972 sound recordings. Despite settling one such suit with the major record labels in October 2015, and entering into direct license agreements for recorded music with major and independent labels, distributors and publishers during the first nine months of 2016 that also permit us to stream certain pre-1972 sound recordings, we still face a number of class-action suits brought by various plaintiffs who seek, among other things, restitution, disgorgement of profits, and punitive damages as well as injunctive relief prohibiting further violation of those copyright owners’ alleged exclusive rights.

If we are found liable for the violation of the exclusive rights of any pre-1972 sound recording copyright owners, then we could be subject to liability, the amount of which could be significant. Similarly, any settlements of the remaining litigation

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could require substantial payments. If we are required to obtain licenses from individual sound recording copyright owners for the reproduction and public performance of pre-1972 sound recordings, then the time, effort and cost of securing such licenses directly from all owners of sound recordings used on our service could be significant and could harm our business and operating results. If we are required to obtain licenses for pre-1972 sound recordings to avoid liability and are unable to secure such licenses, then we may have to remove pre-1972 sound recordings from our service, which could harm our ability to attract and retain users.

We could be adversely affected by regulatory restrictions on the use of mobile and other electronic devices in motor vehicles and legal claims arising from use of such devices while driving.

Regulatory and consumer agencies have increasingly focused on distraction to drivers that may be associated with use of mobile and other devices in motor vehicles. In 2010, the U.S. Department of Transportation identified driver distraction as a top priority, and in April 2013, the National Highway Traffic Safety Administration (the "NHTSA") released voluntary Phase 1 Driver Distraction Guidelines for visual-manual devices not related to the driving task that are integrated into motor vehicles. In November 2016, NHTSA released its proposed voluntary Phase 2 Driver Distraction Guidelines for portable and aftermarket devices that may be used in motor vehicles, which include recommendations such as automatic mobile device pairing with motor vehicle entertainment systems and lock-outs of mobile devices while being used by the driver of a motor vehicle. If NHTSA or other agencies implemented regulatory restrictions and took enforcement action related to how drivers and passengers in motor vehicles may engage with devices on which our service is broadcast, such restrictions or enforcement actions could inhibit our ability to increase listener hours and generate ad revenue, which would harm our operating results. In addition, concerns over driver distraction due to use of mobile and other electronic devices used to access our service in motor vehicles could result in product liability or personal injury litigation and negative publicity.

Federal, state and industry regulations as well as self-regulatory programs related to privacy and data security pose the threat of lawsuits and other liability, require us to expend significant resources for compliance, and may hinder our ability and our advertisers’ ability to deliver certain types of advertising.

We collect and utilize demographic and other information from and about our listeners and artists as they interact with our service, including information which could fall under a definition of "personally identifiable information" under various state and federal laws. For example, to register for a Pandora account, our listeners self-report the following information: birth year, gender, zip code and e-mail address. Listeners must also provide their credit card or debit card numbers and other billing information if they choose to take advantage of additional service offerings, such as Pandora Plus and Pandora Premium. We also may collect location information from listeners who have enabled this feature on their mobile or other devices, information listeners provide on their profile page or in using other community or social networking features that are part of our service, or information listeners provide when they participate in polls or contests or sign up to receive e-mail newsletters. Further, we and third parties use tracking technologies, including "cookies" and related technologies, to help us manage and track our listeners’ interactions with our service and deliver relevant advertising. We also collect information from and track artists’ activity on our Pandora Artist Marketing Platform. Third parties may, either without our knowledge or consent, or in violation of contractual prohibitions, obtain, transmit or utilize our listeners’ or artists’ personally identifiable information, or data associated with particular users, devices or artists.

Various federal and state laws and regulations, as well as the laws of foreign jurisdictions in which we may choose to operate, govern the collection, use, retention, sharing and security of the data we receive from and about our listeners. Privacy groups and government authorities have increasingly scrutinized the ways in which companies link personal identities and data associated with particular users or devices with data collected through the internet, and we expect such scrutiny to continue to increase. Alleged violations of laws and regulations relating to privacy and data security, and any relevant claims, may expose us to potential liability and may require us to expend significant resources in responding to and defending such allegations and claims. Claims or allegations that we have violated laws and regulations relating to privacy and data security have resulted and could in the future result in negative publicity and a loss of confidence in us by our listeners and our advertisers.

Existing privacy-related laws and regulations, and new privacy-related regulations such as the European General Data Protection Regulation (GDPR), are evolving and subject to potentially differing interpretations, and various federal and state legislative and regulatory bodies, as well as foreign legislative and regulatory bodies, may expand current or enact new laws regarding privacy and data security-related matters. We may find it necessary or desirable to join self-regulatory bodies or other privacy-related organizations that require compliance with their rules pertaining to privacy and data security. We are also bound by our public-facing privacy statement, which sets forth the ways in which we collect, use and share information. We also may be bound by contractual obligations that limit our ability to collect, use, disclose and leverage listener data and to derive economic value from it. New laws, amendments to or re-interpretations of existing laws, rules of self-regulatory bodies, industry standards and contractual obligations, as well as changes in our listeners’ expectations and demands regarding privacy

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and data security, may limit our ability to collect, use and disclose, and to leverage and derive economic value from listener data. We may also be required to expend significant resources to adapt to these changes and to develop new ways to deliver relevant advertising or otherwise provide value to our advertisers. In particular, government regulators have proposed, and the GDPR will require, that services implement "do not track" mechanisms, and requirements that users affirmatively "opt-in" to certain types of data collection and use. Such mechanisms and requirements, to the extent required by government regulators or self-regulatory bodies, could significantly hinder our ability to collect and use data relating to listeners. Restrictions on our ability to collect, access and harness listener data, or to use or disclose listener data or any profiles that we develop using such data, could in turn limit our ability to stream personalized music content to our listeners and offer targeted advertising opportunities to our advertising customers, each of which are critical to the success of our business.

We have incurred, and will continue to incur, expenses to comply with privacy and security standards and protocols imposed by law, regulation, self-regulatory bodies, industry standards and contractual obligations. Increased regulation of data utilization and distribution practices, including self-regulation and industry standards, could increase our cost of operation, limit our ability to grow our operations or otherwise adversely affect our business.

Government regulation of the internet is evolving, and unfavorable developments could have an adverse effect on our operating results.

We are subject to general business regulations and laws, as well as regulations and laws specific to the internet. Such laws and regulations cover sales and other taxes and withholding of taxes, user privacy, data collection and protection, copyrights, electronic contracts, sales procedures, automatic subscription renewals, credit card processing procedures, consumer protections, broadband internet access and content restrictions. We cannot guarantee that we have been or will be fully compliant in every jurisdiction, as it is not entirely clear how existing laws and regulations governing issues such as privacy, taxation and consumer protection apply to the internet. Moreover, as internet commerce continues to evolve, increasing regulation by federal, state and foreign agencies becomes more likely. The adoption of any laws or regulations that adversely affect the popularity or growth in use of the internet, including laws limiting internet neutrality, could decrease listener demand for our service offerings and increase our cost of doing business. Future regulations, or changes in laws and regulations or their existing interpretations or applications, could also hinder our operational flexibility, raise compliance costs and result in additional historical or future liabilities for us, resulting in adverse impacts on our business and our operating results.

Our operating results may fluctuate, which makes our results difficult to predict and could cause our results to fall short of expectations.

Our revenue and operating results could vary significantly from quarter to quarter and year to year due to a variety of factors, many of which are outside our control. As a result, comparing our operating results on a period-to-period basis may not be meaningful. In addition to other risk factors discussed in this "Risk Factors" section, factors that may contribute to the variability of our quarterly and annual results include:

• costs associated with pursuing licenses or other commercial arrangements;

• costs associated with defending any litigation, including intellectual property infringement litigation, and any associated judgments or settlements;

• our ability to pursue, and the timing of, entry into new geographic or content markets or other strategic initiatives and, if pursued, our management of these initiatives;

• the impact of general economic and competitive conditions on our revenue and expenses; and

• changes in government regulation affecting our business.

Seasonal variations in listener and advertising behavior may also cause fluctuations in our financial results. We expect to experience some effects of seasonal trends in listener behavior due to higher advertising sales during the fourth quarter of each year due to greater advertiser demand during the holiday season and lower advertising sales in the first quarter of the following year. Expenditures by advertisers tend to be cyclical and discretionary in nature, reflecting overall economic conditions, the economic prospects of specific advertisers or industries, budgeting constraints and buying patterns and a variety of other factors, many of which are outside our control. In addition, we expect to experience increased usage during the fourth quarter of each year due to the holiday season, and in the first quarter of each year due to increased use of media-streaming devices received as gifts during the holiday season.

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If we are unable to maintain effective internal control over financial reporting in the future, the accuracy and timeliness of our financial reporting may be adversely affected.

Pursuant to Section 404 of the Sarbanes-Oxley Act of 2002, we are required to furnish a report by our management on our internal control over financial reporting. The report contains, among other matters, an assessment of the effectiveness of our internal control over financial reporting as of year-end, including a statement as to whether or not our internal control over financial reporting is effective. This assessment must include disclosure of any material weaknesses in our internal control over financial reporting identified by management.

While we have determined that our internal control over financial reporting was effective as of December 31, 2017, as indicated in "Controls and Procedures-Evaluation of Disclosure Controls and Procedures", we must continue to monitor and assess our internal control over financial reporting. If our management identifies one or more material weaknesses in our internal control over financial reporting in 2018 and such weakness remains uncorrected at year-end, we will be unable to assert that such internal control is effective at year-end. If we are unable to assert that our internal control over financial reporting is effective at year-end, or if our independent registered public accounting firm is unable to express an opinion on the effectiveness of our internal controls or concludes that we have a material weakness in our internal controls, we could lose investor confidence in the accuracy and completeness of our financial reports, which could have a material adverse effect on our business and the price of our common stock.

Failure to protect our intellectual property could substantially harm our business and operating results.

The success of our business depends, in part, on our ability to protect and enforce our trade secrets, trademarks, copyrights and patents and all of our other intellectual property rights, including our intellectual property rights underlying the Pandora service. To establish and protect those proprietary rights, we rely on a combination of patents, patent applications, trademarks, copyrights, trade secrets (including know-how), license agreements, information security procedures, non-disclosure agreements with third parties, employee disclosure and invention assignment agreements, and other contractual obligations. These afford only limited protection. Despite our efforts to protect our intellectual property rights, unauthorized parties may copy or attempt to copy aspects of our technology. Moreover, policing our intellectual property rights is difficult, costly and may not always be effective.

We have filed, and may in the future file, patent applications and from time to time we have purchased patents and patent applications from third parties. It is possible, however, that these innovations may not be protectable. In addition, given the cost, effort, risks and downside of obtaining patent protection, including the requirement to ultimately disclose the invention to the public, we may choose not to seek patent protection for certain innovations. However, such patent protection could later prove to be important to our business. Furthermore, there is always the possibility that our patent applications may not issue as granted patents, that the scope of the protection gained will be insufficient or that an issued patent may be deemed invalid or unenforceable. Moreover, in certain circumstances there are additional risks, including:

• present or future patents or other intellectual property rights could lapse or be invalidated, circumvented, challenged or abandoned;

• our ability to assert our intellectual property rights against potential competitors or to settle current or future disputes may be limited by our relationships with third parties;

• our pending or future patent applications may not have coverage sufficient to provide the desired competitive advantage; and

• our intellectual property rights may not be enforced in jurisdictions where competition may be intense or where legal protection may be weak.

We have registered "Pandora," "Music Genome Project", "Next Big Sound", and other marks as trademarks in the United States and other countries. Nevertheless, competitors may adopt service names similar to ours, or purchase confusingly similar terms as keywords in internet search engine advertising programs, thereby impeding our ability to build brand identity and possibly leading to confusion among our listeners or advertising customers. In addition, there could be potential trade name or trademark infringement claims brought by owners of other registered trademarks or trademarks that incorporate variations of the term Pandora or our other trademarks. Any claims or customer confusion related to our trademarks could damage our reputation and brand and substantially harm our business and operating results.

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We currently own the www.pandora.com internet domain name and various other domain names related to our business. The regulation of domain names in the United States and in foreign countries is subject to change. Regulatory bodies continue to establish additional top-level domains, appoint additional domain name registrars and modify the requirements for holding domain names. As a result, we may not be able to acquire or maintain the domain names that utilize our brand names in the United States or other countries in which we may conduct business in the future. If we lose or fail to acquire the right to use any domain name relevant to our current or future business in the United States or other countries, we may incur significant additional expense.

In order to protect our trade secrets and other confidential information, we rely in part on confidentiality agreements with our employees, consultants and third parties with whom we have relationships. These agreements may not effectively prevent disclosure of trade secrets and other confidential information and may not provide an adequate remedy in the event of misappropriation of trade secrets or any unauthorized disclosure of trade secrets and other confidential information. In addition, others may independently discover the same subject matter as that covered by our trade secrets and confidential information, and in some such cases we might not be able to assert any trade secret rights against such parties. Costly and time-consuming litigation could be necessary to enforce and determine the scope of our trade secret rights and related confidentiality and nondisclosure provisions, and failure to obtain or maintain trade secret protection, or our competitors’ independent development of technology similar to ours for which we are unable to rely on other forms of intellectual property protection such as patents, could adversely affect our competitive business position.

Litigation or proceedings before the U.S. Patent and Trademark Office or other governmental authorities and administrative bodies in the United States and abroad may be necessary in the future to enforce our intellectual property rights, to protect our patent rights, trademarks, trade secrets and domain names and to determine the validity and scope of the proprietary rights of others. Our efforts to enforce or protect our proprietary rights may be ineffective and could result in substantial costs and diversion of resources and management time, each of which could substantially harm our operating results.

Assertions by third parties of infringement or other violation by us of their intellectual property rights could result in significant costs and substantially harm our business and operating results.

Internet, technology and media companies are frequently subject to litigation based on allegations of infringement, misappropriation or other violations of others’ intellectual property rights. Some internet, technology and media companies, including some of our competitors, own large numbers of patents, copyrights, trademarks and trade secrets, which they may use to assert claims against us. In addition, we encourage third parties to submit content for our catalog and we cannot be assured that artist representations made in connection with such submissions accurately reflect the legal rights of the submitted content. Third parties have asserted, and may in the future assert, that we have infringed, misappropriated or otherwise violated their intellectual property rights. In addition, various federal and state laws and regulations govern the intellectual property and related rights associated with sound recordings and musical works. Existing laws and regulations are evolving and subject to different interpretations, and various federal and state legislative or regulatory bodies may expand current or enact new laws or regulations. We cannot guarantee that we are not infringing or violating any third-party intellectual property rights.

We cannot predict whether assertions of third-party intellectual property rights or any infringement or misappropriation claims arising from such assertions will substantially harm our business and operating results. When we are forced to defend against any infringement or misappropriation claims, we may be required to expend significant time and financial resources on the defense of such claims, even if without merit, settled out of court, or adjudicated in our favor. Furthermore, an adverse outcome of a dispute may require us to: pay damages (potentially including treble damages and attorneys’ fees if we are found to have willfully infringed a party’s intellectual property); cease making, licensing or using products or services that are alleged to infringe or misappropriate the intellectual property of others; expend additional development resources to redesign our services to avoid infringement; enter into potentially unfavorable content acquisition or license agreements in order to obtain the right to use necessary technologies, content or materials; or to indemnify our partners and other third parties. We do not carry broadly applicable patent liability insurance and lawsuits regarding patent rights, regardless of their success, can be expensive to resolve and can divert the time and attention of our management and technical personnel.

Some of our services and technologies may use "open source" software, which may restrict how we use or distribute our service or require that we release the source code of certain services subject to those licenses.

Some of our services and technologies may incorporate software licensed under "open source" licenses. Such open source licenses often require that source code subject to the license be made available to the public and that any modifications or derivative works to open source software continue to be licensed under open source licenses. Few courts have interpreted open source licenses, and the manner in which these licenses may be interpreted and enforced is therefore subject to some

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uncertainty. We rely on multiple employee and non-employee software programmers to design our proprietary technologies, and since we may not be able to exercise complete control over the development efforts of all such programmers we cannot be certain that they have not incorporated open source software into our products and services without our knowledge, or that they will not do so in the future. In the event that portions of our proprietary technology are determined to be subject to an open source license, we may be required to publicly release the affected portions of our source code, be forced to re-engineer all or a portion of our technologies, or otherwise be limited in the licensing of our technologies, each of which could reduce the value of our services and technologies and materially and adversely affect our ability to sustain and grow our business.

Interruptions or delays in service arising from our own systems or from our third-party vendors could impair the delivery of our service and harm our business.

We rely on systems housed at our own premises and at those of third-party vendors, including network service providers and data center facilities, to enable listeners to stream our content in a dependable and efficient manner. We have experienced and expect to continue to experience periodic service interruptions and delays involving our own systems and those of our third-party vendors. In the event of a service outage at our main site, we maintain a backup site that can function in read-only capacity. We do not currently maintain live fail-over capability that would allow us to instantaneously switch our streaming operations from one facility to another in the event of a service outage. In the event of an extended service outage at our main site, we do maintain and test fail-over capabilities that should allow us to switch our live streaming operations from one facility to another. Both our own facilities and those of our third-party vendors are vulnerable to damage or interruption from earthquakes, floods, fires, power loss, telecommunications failures and similar events. They also are subject to break-ins, hacking, denial of service attacks, sabotage, intentional acts of vandalism, terrorist acts, natural disasters, human error, the financial insolvency of our third-party vendors and other unanticipated problems or events. The occurrence of any of these events could result in interruptions in our service and to unauthorized access to, or alteration of, the content and data contained on our systems and that these third-party vendors store and deliver on our behalf.

We do not exercise complete control over our third-party vendors, which makes us vulnerable to any errors, interruptions, or delays in their operations. Any disruption in the services provided by these vendors could have significant adverse impacts on our business reputation, customer relations and operating results. Upon expiration or termination of any of our agreements with third-party vendors, we may not be able to replace the services provided to us in a timely manner or on terms and conditions, including service levels and cost, that are favorable to us, and a transition from one vendor to another vendor could subject us to operational delays and inefficiencies until the transition is complete.

If our security systems are breached, we may face civil liability and public perception of our security measures could be diminished, either of which would negatively affect our ability to attract and retain listeners and advertisers.

Techniques used to gain unauthorized access to corporate data systems are constantly evolving, and we may be unable to anticipate or prevent unauthorized access to data pertaining to our listeners, including credit card and debit card information and other personally identifiable information. Like all internet services, our service, which is supported by our own systems and those of third-party vendors, is vulnerable to computer malware, Trojans, viruses, worms, break-ins, phishing attacks, denial-of-service attacks, attempts to access our servers to acquire playlists or stream music in an unauthorized manner, or other attacks on and disruptions of our and third-party vendor computer systems, any of which could lead to system interruptions, delays, or shutdowns, causing loss of critical data or the unauthorized access to personally identifiable information. If an actual or perceived breach of security occurs on our systems or a vendor’s systems, we may face civil liability and reputational damage, either of which would negatively affect our ability to attract and retain listeners, which in turn would harm our efforts to attract and retain advertisers. We also would be required to expend significant resources to mitigate the breach of security and to address related matters. Unauthorized access to music or playlists would potentially create additional content acquisition cost obligations with no corresponding revenue.

We may not be able to effectively control the unauthorized actions of third parties who may have access to the listener data we collect. The integration of the Pandora service with apps provided by third parties represents a significant growth opportunity for us, but we may not be able to control such third parties’ use of listeners’ data, ensure their compliance with the terms of our privacy policies, or prevent unauthorized access to, or use or disclosure of, listener information, any of which could hinder or prevent our efforts with respect to growth opportunities.

Any failure, or perceived failure, by us to maintain the security of data relating to our listeners and employees, to comply with our posted privacy policy, laws and regulations, rules of self-regulatory organizations, industry standards and contractual provisions to which we may be bound, could result in the loss of confidence in us, or result in actions against us by governmental entities or others, all of which could result in litigation and financial losses, and could potentially cause us to lose listeners, artists, advertisers, revenue and employees.

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We are subject to a number of risks related to credit card and debit card payments we accept.

We accept subscription payments through credit and debit card transactions. For credit and debit card payments, we pay interchange and other fees, which may increase over time. An increase in those fees would require us to either increase the prices we charge for our products, which could cause us to lose subscribers and subscription revenue, or absorb an increase in our operating expenses, either of which could harm our operating results.

If we or any of our processing vendors have problems with our billing software, or the billing software malfunctions, it could have an adverse effect on our subscriber satisfaction and could cause one or more of the major credit card companies to disallow our continued use of their payment products. In addition, if our billing software fails to work properly and, as a result, we do not automatically charge our subscribers’ credit cards on a timely basis or at all, or there are issues with financial insolvency of our third-party vendors or other unanticipated problems or events, we could lose subscription revenue, which would harm our operating results.

We are also subject to payment card association operating rules, certification requirements and rules governing electronic funds transfers, which could change or be reinterpreted to make it more difficult for us to comply. We are currently accredited against, and in compliance with, the Payment Card Industry Data Security Standard, or PCI DSS, the payment card industry’s security standard for companies that collect, store or transmit certain data regarding credit and debit cards, credit and debit card holders and credit and debit card transactions. Currently we comply with PCI DSS version 3.2 as a Level 2 merchant. There is no guarantee that we will maintain PCI DSS compliance. Our failure to comply fully with PCI DSS in the future could violate payment card association operating rules, federal and state laws and regulations and the terms of our contracts with payment processors and merchant banks. Such failure to comply fully also could subject us to fines, penalties, damages and civil liability, and could result in the loss of our ability to accept credit and debit card payments. Further, there is no guarantee that PCI DSS compliance will prevent illegal or improper use of our payment systems or the theft, loss, or misuse of data pertaining to credit and debit cards, credit and debit card holders and credit and debit card transactions.

If we fail to adequately control fraudulent credit card transactions, we may face civil liability, diminished public perception of our security measures and significantly higher credit card-related costs, each of which could adversely affect our business, financial condition and results of operations. If we are unable to maintain our chargeback rate or refund rates at acceptable levels, credit card and debit card companies may increase our transaction fees or terminate their relationships with us. Any increases in our credit card and debit card fees could adversely affect our results of operations, particularly if we elect not to raise our rates for our service to offset the increase. The termination of our ability to process payments on any major credit or debit card would significantly impair our ability to operate our business.

Our ability to use our net operating loss carryforwards and certain other tax attributes may be limited.

At December 31, 2017, we had federal net operating loss carryforwards of approximately $972.7 million and tax credit carryforwards of approximately $20.5 million. At December 31, 2017, we had state net operating loss carryforwards of approximately $640.2 million and tax credit carryforwards of approximately of $28.2 million. Under Sections 382 and 383 of the Internal Revenue Code of 1986, as amended, ("the Code"), if a corporation undergoes an "ownership change," the corporation’s ability to use its pre-change net operating loss carryforwards and other pre-change tax attributes, such as research tax credits, to offset its post-change income may be limited. In general, an "ownership change" will occur if there is a cumulative change in our ownership by "5-percent stockholders" that exceeds 50 percentage points over a rolling three-year period. Similar rules may apply under state tax laws. As a result of prior equity issuances and other transactions in our stock, we have previously experienced "ownership changes" under section 382 of the Code and comparable state tax laws. We may also experience ownership changes in the future as a result of other future transactions in our stock. As a result, if we earn net taxable income, our ability to use our pre-change net operating loss carryforwards or other pre-change tax attributes to offset United States federal and state taxable income may be subject to limitations.

Changes in U.S. tax laws could have a material adverse effect on our business, cash flow, results of operations or financial conditions.

The Tax Cuts and Jobs Act (“the Act”) was enacted on December 22, 2017 and contains many significant changes to U.S. Federal tax laws. The Act requires complex computations that were not previously provided for under U.S. tax law. The Company has provided for an estimated effect of the Act in its financial statements. The Act requires significant judgments to be made in interpretation of the law and significant estimates in the calculation of the provision for income taxes. However, additional guidance may be issued by the IRS, Department of the Treasury, or other governing body that may significantly

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differ from the Company’s interpretation of the law, which may result in a material adverse effect on our business, cash flow, results of operations or financial conditions.

We could be subject to additional income tax liabilities.

We are subject to income taxes in the United States and in certain foreign jurisdictions. If we expand our operations outside the United States, we would become subject to taxation based on the applicable foreign statutory rates and our effective tax rate could fluctuate accordingly. Significant judgment would be required in evaluating and estimating our worldwide provision for income taxes and accruals for these taxes. For example, our effective tax rates could be adversely affected by earnings being lower than anticipated in countries where we have lower statutory tax rates and higher than anticipated in countries where we have higher statutory tax rates, by losses incurred in jurisdictions for which we are not able to realize the related tax benefit, by changes in foreign currency exchange rates, by changes in the valuation of our deferred tax assets and liabilities, or by changes in the relevant tax, accounting and other laws, regulations, principles and interpretations. We are also subject to tax audits in various jurisdictions, and such jurisdictions may assess additional income tax liabilities against us.

We remain liable for potential sales tax and other tax liabilities related to our ownership of the Ticketfly business.

We closed the sale of Ticketfly to Eventbrite pursuant to the Ticketfly Purchase Agreement on September 1, 2017, but we remain obligated to indemnify Eventbrite for any taxes, including indirect taxes, owed with respect to any period ending on or before the closing date of the sale of Ticketfly to Eventbrite (including any period prior to our acquisition of Ticketfly). As described below, such indirect taxes for which we are required to indemnify Eventbrite could be material.

The application of indirect taxes (such as sales, use, excise, admissions, amusement, entertainment or other transaction-based taxes) to internet-based live entertainment ticketing businesses such as Ticketfly is a complex and evolving area. Many of the fundamental statutes and regulations that impose these taxes were established before the adoption and growth of the internet and ecommerce. In many cases, it is not clear how existing statutes apply to the internet or ecommerce. In addition, governments are increasingly looking for ways to increase revenues, which has resulted in discussions about tax reform and other legislative action to increase tax revenues, including through indirect taxes.

Ticketfly is not the seller of tickets sold on the Ticketfly platform. Instead it facilitates the transaction between its venue partners and customers. If a taxing jurisdiction were to treat Ticketfly as the seller and liable for the tax of the venue partners or customers, it could result in a material liability.

During the time Ticketfly was owned by Pandora, Ticketfly did not calculate all applicable indirect taxes on the fees charged when a customer purchased tickets on the Ticketfly platform. Some jurisdictions may interpret their law in a manner that would require Ticketfly to calculate, collect and remit the applicable indirect taxes on the entire charges. Such an interpretation could negatively impact our indemnity obligations pursuant to the sale of Ticketfly.

The issuance of shares of our Series A redeemable convertible preferred stock to Sirius XM dilutes the ownership of holders of our common stock and may adversely affect the market price of our common stock.

The Sirius XM Investment Agreement provided that (i) 172,500 shares of Series A Preferred Stock would be issued and sold to Sirius XM on June 9, 2017 (the “Initial Closing”) and (ii) the remaining 307,500 shares would be issued and sold to Sirius XM at a future date (the “Additional Closing”), subject to the satisfaction of certain customary closing conditions.

The Initial Closing occurred on June 9, 2017, whereby Sirius XM paid to the Company $172.5 million in exchange for 172,500 shares of Series A redeemable convertible preferred stock. The Additional Closing occurred on September 22, 2017 whereby the Company issued and sold to Sirius XM 307,500 shares of Series A Preferred Stock for $307.5 million. As of December 31, 2017, these shares represented approximately 15% of our outstanding common stock, on an as-converted basis. Holders of Series A redeemable convertible preferred stock are entitled to a cumulative dividend at the rate of 6.0% per annum, payable quarterly in arrears. Beginning on September 22, 2017, the Series A redeemable convertible preferred stock is convertible at the option of the holders at any time into shares of common stock at an initial conversion price of $10.50 per share of common stock and an initial conversion rate of 95.2381 shares of common stock per share of Series A redeemable convertible preferred stock, subject to certain customary anti-dilution adjustments. Any conversion of Series A redeemable convertible preferred stock may be settled by the Company, at our option, in shares of common stock, cash or any combination thereof. However, subject to explicit stockholder approval, the Series A redeemable convertible preferred stock may not be converted into more than 19.99% of our outstanding common stock.

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The conversion of the Series A redeemable convertible preferred stock to common stock would dilute the ownership interest of existing holders of our common stock. Furthermore, any sales in the public market of the common stock issuable upon conversion of the Series A redeemable convertible preferred stock could adversely affect prevailing market prices of our common stock. We granted Sirius XM customary registration rights in respect of their shares of Series A redeemable convertible preferred stock and any shares of common stock issued upon conversion of the Series A redeemable convertible preferred stock. These registration rights would facilitate the resale of such securities into the public market, and any such resale would increase the number of shares of our common stock available for public trading. Sales by Sirius XM of a substantial number of shares of our common stock in the public market, or the perception that such sales might occur, could have a material adverse effect on the price of our common stock.

Our Series A redeemable convertible preferred stock has rights, preferences and privileges that are not held by, and are preferential to, the rights of our common stockholders, which could adversely affect our liquidity and financial condition, may result in the interests of Sirius XM differing from those of our common stockholders and could delay or prevent an attempt to take over our Company.

Sirius XM, as the holder of our Series A redeemable convertible preferred stock, has the right to receive a liquidation preference entitling it to be paid out of our assets available for distribution to stockholders before any payment may be made to holders of our common stock in an amount equal to the sum of (a) $1,000 per share liquidation preference and (b) all accrued dividends as of the date of the liquidation.

In addition, dividends on the Series A redeemable convertible preferred stock accrue and are cumulative at the rate of 6.0% per annum, payable quarterly in arrears. As long as the Series A redeemable convertible preferred stock dividends are in arrears, we may not declare any dividend or make any distributions relating to common stock or redeem any common stock, subject to certain exceptions (including redemptions pursuant to employment contracts and benefit plans).

Sirius XM, as the holder of our Series A Preferred Stock also has certain redemption rights or put rights, including the right to require us to repurchase all or any portion of the Series A Preferred Stock on and immediately following five years after the Additional Closing. As holder of the Series A Preferred Stock, Sirius XM also has the right, subject to certain exceptions, to require us to repurchase all or any portion of the Series A Preferred Stock upon certain change of control events at the greater of (a) 100% of the liquidation preference thereof plus all accrued dividends unpaid through the fifth anniversary of the Initial Closing and (b) the consideration Sirius XM would have received if it had converted its shares of Series A Preferred Stock into common stock immediately prior to the change of control event (disregarding the 19.99% limit).

These dividend and share repurchase obligations could impact our liquidity and reduce the amount of cash flows available for working capital, capital expenditures, growth opportunities, acquisitions, and other general corporate purposes. Our obligations to Sirius XM, as the holder of our Series A Preferred Stock, could also limit our ability to obtain additional financing or increase our borrowing costs, which could have an adverse effect on our financial condition. In certain circumstances, the conversion of Series A Preferred Stock may settle in common stock instead of cash and if such settlement occurs, it would be dilutive to our common stock. The preferential rights could also result in divergent interests between Sirius XM and holders of our common stock. Furthermore, as a sale of our Company will likely require us to repurchase Series A Preferred Stock as a change of control event, this obligation could have the effect of delaying or preventing a sale of our Company that may otherwise be beneficial to our stockholders.

We depend on key personnel to operate our business, and if we are unable to retain, attract and integrate qualified personnel, our ability to develop and successfully grow our business could be harmed.

We believe that our success depends on the contributions of our executive officers as well as our ability to attract and retain qualified sales, technical and other personnel. All of our employees, including our executive officers, are free to terminate their employment relationship with us at any time, and their knowledge of our business and industry may be difficult to replace. Qualified individuals are in high demand, particularly in the digital media industry and in the San Francisco Bay Area, where our headquarters is located, and in New York, and we may incur significant costs to attract them. If we are unable to attract and retain our executive officers and key employees, we may not be able to achieve our strategic objectives, and our business could be harmed. We use stock-based and other performance-based incentive awards such as restricted stock units and cash bonuses to help attract, retain, and motivate qualified individuals. If our stock-based or other compensation programs cease to be viewed as competitive and valuable benefits, our ability to attract, retain, and motivate employees could be weakened, and our business could be harmed.

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 If we cannot maintain our corporate culture as we grow, we could lose the innovation, teamwork and focus that contribute crucially to our business.

We believe that a critical component of our success is our corporate culture, which we believe fosters innovation, encourages teamwork, cultivates creativity and promotes focus on execution. We have invested substantial time, energy and resources in building a highly collaborative team that works together effectively in a non-hierarchical environment designed to promote openness, honesty, mutual respect and pursuit of common goals. As we continue to develop the infrastructure of a public company and grow, we may find it difficult to maintain these valuable aspects of our corporate culture. Any failure to preserve our culture could negatively impact our future success, including our ability to attract and retain employees, encourage innovation and teamwork and effectively focus on and pursue our corporate objectives.

The impact of worldwide economic conditions, including the effect on advertising budgets and discretionary entertainment spending behavior, may adversely affect our business and operating results.

Our financial condition is affected by worldwide economic conditions and their impact on advertising spending. Expenditures by advertisers generally tend to reflect overall economic conditions, and reductions in spending by advertisers could have a serious adverse impact on our business. In addition, we provide an entertainment service, and payment for our Pandora Plus and Pandora Premium subscription services may be considered discretionary on the part of some of our current and prospective subscribers or listeners who may choose to use a competing free service or to listen to Pandora without subscribing. To the extent that overall economic conditions reduce spending on discretionary activities, our ability to retain current and obtain new subscribers could be hindered, which could reduce our subscription revenue and negatively impact our business.

Our business is subject to the risks of earthquakes, fires, floods and other natural catastrophic events and to interruption by man-made problems such as cybersecurity incidents or terrorism.

Our systems and operations are vulnerable to damage or interruption from earthquakes, fires, floods, power losses, telecommunications failures, terrorist attacks, acts of war, human errors, break-ins or similar events. For example, a significant natural disaster, such as an earthquake, fire or flood, could have a material adverse effect on our business, operating results and financial condition, and our insurance coverage may be insufficient to compensate us for losses that may occur. Our principal executive offices are located in the San Francisco Bay Area, a region known for seismic activity. In addition, acts of terrorism could cause disruptions in our business or the economy as a whole. Our servers may also be vulnerable to computer viruses, cybersecurity incidents and similar disruptions caused by unauthorized tampering with our computer systems, which could lead to interruptions, delays, loss of critical data or the unauthorized disclosure of confidential customer data. Our business interruption insurance may be insufficient to compensate us for all such losses. As we rely heavily on our servers and the internet to conduct our business and provide high quality service to our listeners, such disruptions could negatively impact our ability to run our business, resulting in a loss of existing or potential listeners and advertisers and increased maintenance costs, which would adversely affect our operating results and financial condition.

We may not have sufficient cash flow from our business to make payments on our indebtedness.

Our ability to make scheduled payments of the principal of, to pay interest on or to refinance our indebtedness, including our 1.75% convertible senior notes due 2020 (the "Notes") and any borrowings we might make under our credit facility, depends on our performance, which is subject to economic, financial, competitive and other factors beyond our control. Our business may not generate cash flow from operations in the future sufficient to service our debt and make necessary capital expenditures. If we are unable to generate such cash flow, we may be required to adopt one or more alternatives, such as selling assets, restructuring debt or obtaining additional equity capital on terms that may be onerous or highly dilutive. Our ability to refinance our indebtedness will depend on the capital markets and our financial condition at such time. We may not be able to engage in any of these activities or engage in these activities on desirable terms, which could result in a default on our debt obligations.

The conditional conversion feature of the Notes, if triggered, may adversely affect our financial condition and operating results.

In the event the conditional conversion feature of the Notes is triggered, holders of Notes will be entitled to convert the Notes at any time during specified periods at their option. See Note 9, "Debt Instruments". If one or more holders elect to convert their Notes, we may elect to satisfy our conversion obligation in whole or in part through the payment of cash, which could adversely affect our liquidity. In addition, even if holders do not elect to convert their Notes, we could be required under

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applicable accounting rules to reclassify all or a portion of the outstanding principal of the Notes as a current rather than long-term liability, which would result in a material reduction of our net working capital.

The accounting method for convertible debt securities that may be settled in cash, such as the Notes, could have a material effect on our reported financial results.

Accounting Standards Codification Subtopic 470-20 (ASC 470-20), Debt with Conversion and Other Options, requires an entity to separately account for the liability and equity components of convertible debt instruments (such as the Notes) that may be settled entirely or partially in cash upon conversion in a manner that reflects the issuer’s economic interest cost. The effect of ASC 470-20 on the accounting for the Notes is that the equity component of the Notes is required to be included in the additional paid-in capital section of stockholders’ equity on our consolidated balance sheet, and the value of the equity component is treated as original issue discount for purposes of accounting for the debt component of the Notes. As a result, we will be required to recognize a greater amount of non-cash interest expense in current and future periods as a result of the amortization of the discounted carrying value of the Notes to their principal amount over the term of the Notes. We will report lower net income (or greater net losses) in our consolidated financial results because ASC 470-20 will require interest to include both the current period’s amortization of the original issue discount and the instrument’s coupon interest, which could adversely affect our reported or future consolidated financial results, the trading price of our common stock and the trading price of the Notes.

In addition, under certain circumstances, in calculating earnings per share, convertible debt instruments (such as the Notes) that may be settled entirely or partly in cash are currently accounted for utilizing the treasury stock method, the effect of which is that the shares of common stock issuable upon conversion of the Notes, if any, are not included in the calculation of diluted earnings per share except to the extent that the conversion value of the Notes exceeds their principal amount. Under the treasury stock method, diluted earnings per share is calculated as if the number of shares of common stock that would be necessary to settle such excess, if we were to elect to settle such excess in shares, were issued. We cannot be sure that the accounting standards in the future will continue to permit the use of the treasury stock method. If we are unable to use the treasury stock method in accounting for the shares issuable upon conversion of the Notes (if any) then, to the extent we generate positive net income, our diluted consolidated earnings per share would be adversely affected.

Risks Related to Owning Our Common Stock

Our stock price has been and will likely continue to be volatile, and the value of an investment in our common stock may decline.

The trading price of our common stock has been and is likely to continue to be volatile. In addition to the risk factors described in this section, and elsewhere in this Annual Report on Form 10-K, additional factors that may cause the price of our common stock to fluctuate include, but are not limited to:

• our actual or anticipated operating performance and the operating performance of similar companies in the internet, radio or digital media spaces;

• our ability to grow active users and listener hours;

• competitive conditions and developments;

• our actual or anticipated achievement of financial and non-financial key operating metrics;

• general economic conditions and their impact on advertising spending;

• the overall performance of the equity markets;

• threatened or actual litigation or regulatory proceedings, including the current Phonorecords III rate proceedings in the CRB;

• changes in laws or regulations relating to our service;

• any major change in our board of directors or management;

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• publication of research reports about us or our industry or changes in recommendations or withdrawal of research coverage by securities analysts; and

• sales or expected sales of shares of our common stock by us, and our officers, directors and significant stockholders.

In addition, the stock market has experienced extreme price and volume fluctuations that often have been unrelated or disproportionate to the operating performance of affected companies. Securities class action litigation has often been instituted against companies following periods of volatility in the overall market and in the market price of a company’s securities. Such litigation, if instituted against us, could result in substantial costs, divert our management’s attention and resources and harm our business, operating results and financial condition.

If securities or industry analysts cease publishing research about our business, publish inaccurate or unfavorable research about our business, or make projections that exceed our actual results, our stock price and trading volume could decline.

The trading market for our common stock depends in part on the research and reports that securities or industry analysts publish about us or our business. If securities or industry analysts who cover us downgrade our stock or publish inaccurate or unfavorable research about our business, our stock price would likely decline. If one or more of these analysts cease coverage of us or fail to publish reports on us regularly, demand for our stock could decrease, which might cause our stock price and trading volume to decline. Furthermore, such analysts publish their own projections regarding our actual results. These projections may vary widely from one another and may not accurately predict the results we actually achieve. Our stock price may decline if we fail to meet securities and industry analysts’ projections.

Our charter documents, Delaware law and certain terms of our music licensing arrangements could discourage takeover attempts and lead to management entrenchment.

Our certificate of incorporation and bylaws contain provisions that could delay or prevent a change in control of the Company. These provisions could also make it difficult for stockholders to elect directors who are not nominated by the current members of our board of directors or take other corporate actions, including effecting changes in our management. These provisions include:

• a classified board of directors with three-year staggered terms, which could delay the ability of stockholders to change the membership of a majority of our board of directors;

• no cumulative voting in the election of directors, which limits the ability of minority stockholders to elect director candidates;

• the ability of our board of directors to issue shares of preferred stock and to determine the price and other terms of those shares, including preferences and voting rights, without stockholder approval, which could be used to significantly dilute the ownership of a hostile acquiror;

• the exclusive right of our board of directors to elect a director to fill a vacancy created by the expansion of our board of directors or the resignation, death or removal of a director, which prevents stockholders from being able to fill vacancies on our board of directors;

• a prohibition on stockholder action by written consent, which forces stockholder action to be taken at an annual or special meeting of our stockholders;

• the requirement that a special meeting of stockholders may be called only by the chairman of our board of directors, our president, our secretary, or a majority vote of our board of directors, which could delay the ability of our stockholders to force consideration of a proposal or to take action, including the removal of directors;

• the requirement for the affirmative vote of holders of at least 66 2⁄3% of the voting power of all of the then outstanding shares of the voting stock, voting together as a single class, to amend the provisions of our certificate of incorporation relating to the issuance of preferred stock and management of our business or our bylaws, which may inhibit the ability of an acquiror to effect such amendments to facilitate an unsolicited takeover attempt;

• the ability of our board of directors, by majority vote, to amend the bylaws, which may allow our board of directors to take additional actions to prevent an unsolicited takeover and inhibit the ability of an acquiror to amend the bylaws to facilitate an unsolicited takeover attempt; and

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• advance notice procedures with which stockholders must comply to nominate candidates to our board of directors or to propose matters to be acted upon at a stockholders’ meeting, which may discourage or deter a potential acquiror from conducting a solicitation of proxies to elect the acquiror’s own slate of directors or otherwise attempting to obtain control of us.

Section 203 of the Delaware General Corporation Law governs us. These provisions may prohibit large stockholders, in particular those owning 15% or more of our outstanding voting stock, from merging or combining with us for a certain period of time.

In addition, if we are acquired, certain terms of our music licensing arrangements, including favorable rates for content acquisition costs that currently apply to us, may not be available to an acquiror. These terms may discourage a potential acquiror from making an offer to buy us or may reduce the price such a party may be willing to offer.

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ITEM 1B. UNRESOLVED STAFF COMMENTS

Not applicable.

ITEM 2. PROPERTIES

Our principal executive offices are located in Oakland, California, under a lease for approximately 250,000 square feet of office space, expiring on September 30, 2020. Our second largest office is located in New York, New York, under a lease for approximately 100,000 square feet of office space, expiring on September 30, 2026. We recently announced a plan to expand our workforce in Atlanta, Georgia, where we have an existing regional office. We also lease regional offices in Chicago, Illinois; Dallas, Texas; Detroit, Michigan; and Santa Monica, California and local sales offices at various locations throughout the United States.

Our data centers are located in colocation facilities operated by Equinix in San Jose, California and Ashburn, Virginia, Digital Realty Trust in Chicago, Illinois and Oakland, California and InfoMart, LLC in San Jose, California. These data centers are designed to be fault-tolerant and operate at maximum uptime. Backup systems in California and Virginia can be brought online in the event of a failure at the other data centers. These redundancies enable fault tolerance and will also support our continued growth.

The data centers host the Pandora.com website and intranet applications that are used to manage the website content. The websites are designed to be fault-tolerant, with a collection of identical web servers connecting to an enterprise database. The design also includes load balancers, firewalls and routers that connect the components and provide connections to the internet. The failure of any individual component is not expected to affect the overall availability of our website.

We believe that our current facilities are adequate to meet our needs for the near future and that suitable additional or alternative space will be available on commercially reasonable terms to accommodate our foreseeable future operations.

ITEM 3. LEGAL PROCEEDINGS

The material set forth in the section entitled "Legal Proceedings" in Note 11 of the Notes to Consolidated Financial Statements in Part II, Item 8 of this Annual Report on Form 10-K is incorporated herein by reference.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

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PART II

ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Market Information

Our common stock has traded on The New York Stock Exchange ("NYSE") under the symbol "P" since June 15, 2011. Our initial public offering was priced at $16.00 per share on June 14, 2011. The following table sets forth the range of high and low intra-day sales prices per share of our common stock for the periods indicated, as reported by the NYSE.

	High		Low
Year ended December 31, 2017
First quarter (January 1, 2017 - March 31, 2017)	$	13.58	$	11.48
Second quarter (April 1, 2017 - June 30, 2017)	$	11.98	$	6.91
Third quarter (July 1, 2017 - September 30, 2017)	$	9.83	$	7.69
Fourth quarter (October 1, 2017 - December 31, 2017)	$	8.19	$	4.49
Year Ended December 31, 2016
First quarter (January 1, 2016 - March 31, 2016)	$	12.25	$	7.88
Second quarter (April 1, 2016 - June 30, 2016)	$	12.52	$	8.17
Third quarter (July 1, 2016 - September 30, 2016)	$	14.63	$	12.00
Fourth quarter (October 1, 2016 - December 31, 2016)	$	14.77	$	10.42

On December 31, 2017, the closing price per share of our common stock as reported on the NYSE was $4.82. As of December 31, 2017, there were approximately 65 holders of record of our common stock. The number of beneficial stockholders is substantially greater than the number of holders of record because a large portion of our common stock is held through brokerage firms.

Dividend Policy

We have not declared or paid any cash dividends on our common stock and currently do not anticipate paying any cash dividends in the foreseeable future. Instead, we intend to retain all available funds and any future earnings for use in the operation and expansion of our business. Any future determination relating to dividend policy will be made at the discretion of our board of directors and will depend on our future earnings, capital requirements, financial condition, future prospects, applicable Delaware law, which provides that dividends are only payable out of surplus or current net profits, and other factors that our board of directors deems relevant. In addition, our credit facility restricts our ability to pay dividends. See "Management's Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Our Indebtedness—Credit Facility" and Note 9 to our financial statements included elsewhere in this Annual Report on Form 10-K.

Equity Compensation Plan Information

For equity compensation plan information refer to Item 12 in Part III of this Annual Report on Form 10-K.

Stock Price Performance Graph

This performance graph shall not be deemed to be "soliciting material" or "filed" or incorporated by reference in future filings with the SEC, or subject to the liabilities of Section 18 of the Exchange Act except as shall be expressly set forth by specific reference in such filing.

The following graph shows a comparison from June 15, 2011, the date our common stock commenced trading on the NYSE, through December 31, 2017 of the total cumulative return of our common stock with the total cumulative return of the New York Stock Exchange Composite Index (the "NYA Composite"), the Global X Social Media Index (the "SOCL") and the SPDR Morgan Stanley Technology MTK Index (the "MTK"). The figures represented below assume an investment of $100 in

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our common stock at the closing price of $17.42 on June 15, 2011 and in the NYA Composite and MTK on the same date. The SOCL was modeled from the inception of the index on November 15, 2011. Data for the NYA Composite, MTK and SOCL assume reinvestment of dividends. The comparisons in the graph are historical and are not intended to forecast or be indicative of possible future performance of our common stock.

Comparison of Cumulative Total Return Among Pandora Media, Inc.,

New York Stock Exchange Composite Index, Global X Social Media Index and

SPDR Morgan Stanley Technology MTK Index

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ITEM 6. SELECTED FINANCIAL DATA

The following selected consolidated financial and other data should be read in conjunction with, and are qualified by reference to, Item 7, "Management's Discussion and Analysis of Financial Condition and Results of Operations," and our audited consolidated financial statements and the accompanying notes included elsewhere in this report. The consolidated statement of operations data for the eleven months ended December 31, 2013 and the year ended December 31, 2014 and the consolidated balance sheet data as of December 31, 2013, 2014 and 2015 were derived from our audited consolidated financial statements not included in this report. The consolidated statements of operations data for the years ended December 31, 2015, 2016 and 2017, and the consolidated balance sheet data as of December 31, 2016 and 2017 were derived from our audited consolidated financial statements included in this report. The consolidated statements of operations for the years ended December 31, 2015, 2016 and 2017 include Ticketfly results for the two months ended December 31, 2015, the year ended December 31, 2016 and the period ended September 1, 2017. There is no ticketing service revenue subsequent to the disposition of Ticketfly. Refer to Note 5 "Dispositions" in the Notes to Consolidated Financial Statements for further details on the Ticketfly disposition. The consolidated balance sheets as of December 31, 2015 and 2016 include Ticketfly's financial position as of December 31, 2015 and 2016.

The historical results presented below are not necessarily indicative of financial results to be achieved in future periods.

Income Statement Data:

	Eleven months ended   December 31,			Year ended   December 31,
	2013			2014			2015			2016			2017
	(in thousands, except per share data)
Total revenue	$	600,233		$	920,802		$	1,164,043		$	1,384,826		$	1,466,812
Net loss	$	(27,017	)	$	(30,406	)	$	(169,661	)	$	(342,978	)	$	(518,395	)
Net loss available to common stockholders	$	(27,017	)	$	(30,406	)	$	(169,661	)	$	(342,978	)	$	(558,561	)
Net loss per common share, basic and diluted	$	(0.15	)	$	(0.15	)	$	(0.79	)	$	(1.49	)	$	(2.29	)
Weighted-average basic and diluted common shares	180,968			205,273			213,790			230,693			243,637

Key Metrics (unaudited):(1)

	Eleven Months Ended   December 31,	Year ended   December 31,
	2013	2014	2015	2016	2017
	(in billions)
Listener hours	15.31	20.03	21.11	21.96	20.61

	As of December 31,
	2013	2014	2015	2016	2017
	(in millions)
Active users	76.2	81.5	81.1	81.0	74.7
(1) Listener hours and active users are defined in the section entitled "Key Metrics" in Item 7 of this Annual Report on Form 10-K.

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Balance Sheet Data:

	As of December 31,
	2013		2014		2015		2016		2017
	(in thousands)
Cash and cash equivalents	$	245,755	$	175,957	$	334,667	$	199,944	$	499,597
Working capital	$	362,777	$	439,254	$	451,675	$	371,704	$	685,883
Total assets	$	673,335	$	749,290	$	1,240,657	$	1,184,810	$	1,166,322
Long-term debt, net	$	—	$	—	$	234,577	$	342,247	$	273,014
Total liabilities	$	165,104	$	165,933	$	497,270	$	630,551	$	522,795
Redeemable convertible preferred stock	$	—	$	—	$	—	$	—	$	490,849
Common stock and additional paid-in capital	$	675,123	$	781,030	$	1,110,562	$	1,264,717	$	1,422,246
Total stockholders' equity	$	508,231	$	583,357	$	743,387	$	554,259	$	152,678

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ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (MD&A)

You should read the following discussion of our financial condition and results of operations in conjunction with the financial statements and the notes thereto included elsewhere in this Annual Report on Form 10-K. The following discussion contains forward-looking statements that are subject to risks and uncertainties. Actual results may differ substantially from those referred to herein due to a number of factors, including but not limited to those discussed below and elsewhere in this report, particularly in the sections entitled "Special Note Regarding Forward-Looking Statements and Industry Data" and "Risk Factors."

Overview

Pandora—Streaming Radio and On-Demand Music Services

Pandora is the world's most powerful music discovery platform, offering a personalized experience for each of our listeners wherever and whenever they want to listen to music—whether through mobile devices, car speakers or connected devices in the home. Unlike traditional radio that broadcasts the same content at the same time to all of their listeners, we enable our listeners to create personalized stations and playlists, as well as search and play songs and albums on-demand. The Music Genome Project and our content programming algorithms power our ability to predict listener music preferences, play music content suited to the tastes of each individual listener and introduce listeners to the music we think they will love. The Music Genome Project is a database of over 1.5 million uniquely analyzed songs from over 250 thousand artists, spanning over 660 genres and sub-genres, which our team of trained musicologists has developed one song at a time by evaluating and cataloging each song’s particular attributes. The Music Genome Project database is a subset of our full catalog available to be played. Over time, our service has evolved by using data science to develop playlisting algorithms that further tailor the listener experience based on individual listener and broader audience reactions to the recordings we pick. With billions of data points collected from our listeners, we are able to use listeners' feedback to fuel our ability to choose exactly the right song for our users. Founded by musicians, Pandora also empowers artists with valuable data and tools to help grow their audience and connect with their fans.

Pandora is available as an ad-supported service, a radio subscription service called Pandora Plus and an on-demand subscription service called Pandora Premium. The majority of our listener hours occur on mobile devices, with the majority of our revenue generated from advertising on our ad-supported radio service on these devices. With billions of data points that help us understand our users' preferences, we offer both local and national advertisers the opportunity to deliver targeted messages to our listeners using a combination of audio, display and video advertisements. We also generate increasing revenue from our subscription offerings.

For the year ended December 31, 2017, we streamed 20.61 billion hours of content, and as of December 31, 2017, we had 74.7 million active users during the trailing 30-day period and 5.48 million paid subscribers. Since we launched our service in 2005, our listeners have created over 12 billion stations.

Ad-Supported Radio Service

Our ad-supported service allows listeners to access our music and podcast catalogs and personalized playlist generating system for free across all of our delivery platforms. We also offer listeners on our ad-supported service access to our on-demand service in exchange for engaging with an ad, which allows advertisers to engage with a user to create a positive brand experience. This service is valued by lean-back listeners, as it uses the Music Genome Project to instantly generate a station that plays music we think that listener will enjoy. Over time, our service has evolved by using data science to further tailor the listener experience based on listener reactions to the content we pick. Listeners also have the ability to add variety to and rename stations, which further allows for the personalization of our service. We also offer listeners on our ad-supported service the option to gain temporary access to on-demand listening experience, which includes some features of our Pandora Premium service, in exchange for viewing a video ad. We call this experience Premium Access.

Subscription Radio Service—Pandora Plus

Pandora Plus is a paid, ad-free subscription version of the Pandora radio service that also includes replays, additional skipping of songs, offline listening, higher quality audio on supported devices and longer timeout-free listening. This service is valued by listeners who want the ability to have limited interactive features such as skips and replays. Similar to the ad-supported service, the more the listener interacts with the platform, the more we tailor the songs we recommend to the listener.

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On-Demand Subscription Service—Pandora Premium

Our on-demand subscription service, Pandora Premium, launched in the United States in April 2017. Pandora Premium is an on-demand version of the Pandora service that offers a unique, on-demand experience, providing users with the ability to search, play and collect songs and albums, build playlists on their own or with the tap of a button, listen to curated playlists and share playlists on social networks. Unique to Pandora, a listener can create partial playlists and have Pandora complete the playlist based on the user's listening activity using the Music Genome Project. The features of Pandora Plus are also included in Pandora Premium.

A key element of our strategy is to make the Pandora service available in any environment that has internet connectivity. To this end, we make the Pandora service available through a variety of distribution channels. In addition to streaming our service to computers, we have developed Pandora mobile device applications ("apps") for smartphones and mobile operating systems, such as the iPhone and Android and for tablets, including the iPad and Android tablets. We distribute those mobile apps free to listeners via app stores.

We expect to continue to make enhancements to Pandora Plus and Pandora Premium, which will require engineering effort, as well as other resources. In addition, in connection with the launch and continued operation of these services we have entered into direct license agreements with major and independent record labels, some of which include substantial minimum guarantee payments. In order for Pandora Plus and Pandora Premium to be successful, we will need to attract subscribers to these service offerings. The market for subscription-based music services, including on-demand services, is intensely competitive, and our ability to realize a return on our investments on these service offerings will depend on our ability to leverage the existing audience of our ad-supported service, our brand awareness and our ability to deliver differentiated subscription services with features and functionality that listeners find attractive. Refer to our discussion of these matters in Item 1A—"Risk Factors".

Ticketing Service

Prior to September 1, 2017, we operated a ticketing service through our former subsidiary Ticketfly, a leading live events technology company that provides ticketing and marketing software and services for clients, which are venues and event promoters, across North America. We completed the sale of Ticketfly on September 1, 2017. Refer to Note 5 "Dispositions" in the Notes to Consolidated Financial Statements for further details on the Ticketfly disposition.

Recent Events

Ticketfly Disposition

On September 1, 2017, we completed the sale of Ticketfly, our ticketing service segment, to Eventbrite Inc. ("Eventbrite") for an aggregate unadjusted purchase price of $200.0 million. The aggregate unadjusted purchase price consists of $150.0 million in cash and a $50.0 million Convertible Promissory Note, which were paid and issued at the closing of the transaction. The Convertible Promissory Note was recorded at its fair value at the date of sale, which resulted in a discount of $13.8 million. The aggregate purchase price was further reduced by $4.8 million in costs to sell, $7.5 million in working capital adjustments and certain indemnification provisions, for a net purchase price of $174.0 million. Refer to Note 8 "Convertible Promissory Note Receivable" in the Notes to Consolidated Financial Statements for further details on the Convertible Promissory Note.

In the three months ended June 30, 2017, the assets and liabilities of Ticketfly were classified as held for sale, and we recognized a goodwill impairment charge of $131.7 million. The impairment charge was based on the fair value of the net assets as implied by the estimated purchase price of $184.5 million as of June 30, 2017. In the year ended December 31, 2017, we recognized a loss on sale of $9.3 million in the general and administrative line item on our Consolidated Statements of Operations, which was based on an adjusted net purchase price of $174.0 million as of September 1, 2017 and includes $1.1 million in transfers of cumulative translation adjustments. Refer to Note 5 "Dispositions" in the Notes to Consolidated Financial Statements for further details on the Ticketfly disposition.

KXMZ Disposition

On August 31, 2017, we completed the sale of KXMZ, an FM radio station based in Rapid City, South Dakota. The sale did not result in a material impact to our consolidated financial statements. Refer to Note 5 "Dispositions" in the Notes to Consolidated Financial Statements for further details on the KXMZ disposition.

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Australia and New Zealand

On June 27, 2017, we announced a plan to discontinue business activities in Australia and New Zealand. The related restructuring charges in the year ended December 31, 2017 primarily relate to a reduction of headcount of approximately 50 employees, which resulted in employee severance and benefits costs offset by a credit related to non-cash stock-based compensation expense reversals for unvested equity awards. The dissolution of the Australia and New Zealand business operations was substantially completed in the three months ended September 30, 2017. These restructuring charges did not have a material impact on our financial statements.

Redeemable Convertible Preferred Stock

In June 2017, we entered into an agreement with Sirius XM Radio, Inc. ("Sirius XM") to sell 480,000 shares of Series A redeemable convertible preferred stock ("Series A") for $1,000 per share, with gross proceeds of $480.0 million. The Series A shares were issued in two rounds: an initial closing of 172,500 shares for $172.5 million that occurred on June 9, 2017 upon signing the agreement with Sirius XM, and an additional closing of 307,500 shares for $307.5 million that occurred on September 22, 2017. Refer to Note 10 "Redeemable Convertible Preferred Stock" in the Notes to Consolidated Financial Statements for further details on the redeemable convertible preferred stock sale.

Factors Affecting our Business Model 

Content Acquisition Costs

For sound recording rights, we pay content acquisition costs based on the terms of direct license agreements with major and independent music labels and distributors for the significant majority of the sound recordings we stream on our ad-supported service, Pandora Plus and Pandora Premium. Depending on the applicable service, these license agreements generally require us to pay either a per-performance fee based on the number of sound recordings we transmit, a percentage of revenue associated with the service, or a per-subscriber minimum amount. Certain of these license agreements require minimum guarantee payments, some of which are paid in advance.

If we have not entered into a direct license agreement with the copyright owner of a particular sound recording that is streamed on our services, we stream that sound recording pursuant to a statutory license and pay the applicable rates set by the Copyright Royalty Board ("CRB") for the period from January 1, 2016 through December 31, 2020 (the "Section 114 Rates"). The 2016 and 2017 rates for non-subscription services, such as our ad-supported service, were set at $0.0017 per play and the rates for subscription services, such as Pandora Plus, were set at $0.0022, adjusted for inflation. Effective January 1, 2018, these rates were adjusted for inflation to $0.0018 per play for non-subscription services and $0.0023 per play for subscription services. Sound recordings streamed under the statutory license and paid at the CRB-set rates can only be played in radio mode on our services. These sound recordings cannot be played on-demand or offline and are not eligible for replay or additional skips.

Content acquisition costs for musical works are negotiated with and paid to performing rights organizations ("PROs") such as the American Society of Composers, Authors and Publishers ("ASCAP"), Broadcast Music, Inc. ("BMI"), SESAC, Inc. ("SESAC") and Global Music Rights, and directly to publishing companies. Content acquisition costs for the streaming of musical works on our ad-supported service are calculated such that each copyright holder receives its usage-based and ownership-based share of a royalty pool equal to 20% of the content acquisition costs paid by us for sound recordings on our ad-supported service. Content acquisition costs for the streaming of musical works on our subscription services are equal to the rates determined in accordance with the statutory license set forth in 17 U.S.C. §115 ("Section 115").

The rate structure for the statutory license for reproduction rights under Section 115 expired at the end of 2017. A new rate structure was set in January 2018, covering the period from January 1, 2018 through December 31, 2022, by a three judge CRB panel, and we were one of five commercial music service operators (along with Amazon, Apple, Google and Spotify) that participated in rate-setting proceedings that determined these rates (the "Phonorecords III Proceedings"). The Nashville Songwriters Association International, the National Association of Music Publishers and George Johnson Music Publishing are also participating in the Phonorecords III Proceedings. A trial before the CRB concluded in April 2017, and the CRB rendered a decision in January 2018 ("the Initial Determination"). If the Initial Determination is adopted and affirmed, the "all-in" rate that streaming services, including Pandora, will pay to music publishers and songwriters for the mechanical rights and performance rights needed in connection with interactive streaming will increase annually between 2018 and 2022: from 11.4% of revenues or 22.0% of label payments in 2018, to 15.1% of revenues or 26.2% of label payments in 2022. Certain per-subscriber minimum royalty floors also apply depending on the type of service. The CRB may elect to modify the Initial Determination at

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the request of the participants in the Phonorecords III Proceedings, and thereafter the final CRB decision may be appealed for review by the DC Circuit Court of Appeals.

The Phonorecords III Proceedings are important to us because our direct licenses with music publishers use the Section 115 rates. As a result, increases in the Section 115 rates increase our content acquisition costs for our subscription services, which, if such increase were substantial, could materially harm our financial condition and hinder our ability to provide interactive features in our services, or cause one or more of our subscription services to not be economically viable.

Ad-Supported Service

Our ad-supported service is monetized through the sale of display, audio and video advertisements to national, regional and local advertisers.

Our total number of listener hours is a key driver for both advertising revenue generation opportunities and content acquisition costs, which are the largest component of our ad-related expenses.

• Advertising Revenue. Listener hours define the number of opportunities we have to sell advertisements. Our ability to attract advertisers depends in large part on our ability to offer sufficient inventory within desired demographics.

• Cost of Revenue—Content Acquisition Costs—Ad-Supported Service. We pay content acquisition costs to the copyright owners and performers, or their agents, of each sound recording that we stream, as well as to the publishers and songwriters, or their agents, for the musical works embodied in each of those sound recordings, subject to certain exclusions. The majority of the content acquisition costs related to our ad-supported service are driven by direct license agreements with major and independent labels and distributors, as discussed above in "Factors Affecting Our Business Model—Content Acquisition Costs". Certain of these license agreements include minimum guarantee payments, some of which are paid in advance.

As a result of the structure of our license agreements, our ability to achieve and sustain profitability and operating leverage on our ad-supported service depends on our ability to increase our advertising revenue per thousand listener hours ("ad RPM") of streaming through increased advertising revenue across all of our delivery platforms.

Subscription Services

We monetize our subscription services through subscription payments made by users of the services. We drive subscriber growth by providing the world's most powerful music discovery platform, offering a personalized experience for each of our listeners, and investing in marketing and free-trials to promote our service.

Our total number of paid subscriptions is a key driver for both subscription revenue and content acquisition costs related to our subscription services, which is the largest component of our subscription-related expenses. In order to drive greater subscription revenue, we must increase the number of new subscribers to our subscription services and minimize the number of current subscribers who discontinue their subscriptions.

• Subscription Revenue. Our subscription revenue depends upon the number of paid subscriptions we are able to sell and the price that our subscribers pay for those subscriptions. Our ability to attract subscribers depends in large part on our ability to offer features and functionality on our subscription services that are valued by consumers within desired demographics, on terms that are attractive to those consumers, and still enable us to maintain adequate gross margins.

• Cost of Revenue—Content Acquisition Costs—Subscription Services. We pay content acquisition costs to the copyright owners, performers, songwriters, or their agents, subject to certain exclusions. The majority of our content acquisition costs related to our subscription service are generally driven by direct license agreements with major and independent labels and distributors, PROs and publishers, as discussed above in "Factors Affecting Our Business Model—Content Acquisition Costs". Certain of these license agreements include minimum guarantee payments, some of which are paid in advance.

Given the structure of our license agreements for our subscription services, the majority of our content acquisition costs increase as subscription revenue increases and are subject to minimum guarantee payments. As such, our ability to achieve and sustain profitability and operating leverage on our subscription services depends on our ability to increase our revenue through

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increased paid subscriptions on terms that maintain an adequate gross margin. Refer to our discussion of these matters in Item 1A—"Risk Factors".

Key Metrics

The numbers for our key metrics, which include our listener hours, active users, advertising RPM, advertising licensing costs per thousand listener hours ("ad LPM"), paid subscribers, average monthly revenue per paid subscriber ("ARPU") and average monthly licensing costs per paid subscriber ("LPU") are calculated using internal company data. While these numbers are based on what we believe to be reasonable estimates of our user base for the applicable period of measurement, there are inherent challenges in measuring usage of our products across large online and mobile populations. In addition, we are continually seeking to improve our estimates of our user base, and such estimates may change due to improvements or changes in our methodology.

In the quarter ended December 31, 2016, we began reporting new key metrics on a prospective basis as a result of a change in our service offerings. We discontinued our previous key metrics as of October 1, 2016. Certain of our new key metrics are not comparable to prior periods given the lack of history of our new service offerings. As such, these metrics have not been presented for, nor compared against, these periods. Key metrics that did not change are presented for the year ended December 31, 2017 and are compared to the results for the year ended December 31, 2016.

Total Service

Listener hours

We track listener hours because it is a key indicator of the growth of our business and the engagement of our listeners. We include listener hours related to our non-radio content offerings in the definition of listener hours. These offerings include non-music content such as podcasts, as well as custom music content such as Pandora Premieres and artist mixtapes. We calculate listener hours based on the total bytes served for each track that is requested and served from our servers, as measured by our internal analytics systems, whether or not a listener listens to the entire track. For non-music content such as podcasts, episodes are divided into approximately track-length parts, which are treated as tracks under this definition. To the extent that third-party measurements of listener hours are not calculated using a similar server-based approach, the third-party measurements may differ from our measurements. We have implemented strategic hours control mechanisms, such as time outs, to optimize content acquisition costs for our ad-supported listening, and will continue to use these measures in the future.

The table below sets forth the total listener hours for the years ended December 31, 2015, 2016 and 2017.

	Year ended December 31,
	2015	2016	2017
Service	Listener hours (in billions)
Advertising	18.47	19.17	16.41
Subscription	2.64	2.79	4.20
Total	21.11	21.96	20.61

Active users

We track the number of active users as an additional indicator of the breadth of audience we are reaching at a given time. We define active users as the number of distinct registered users, including subscribers that have requested audio from our servers within the trailing 30 days to the end of the final calendar month of the period. The number of active users may overstate the number of unique individuals who actively use our service, as one individual may register for, and use, multiple accounts.

The table below sets forth our total active users as of December 31, 2016 and 2017.

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	As of December 31,
	2016	2017
	(in millions)
Active users—all services	81.0	74.7

Advertising-based service

Advertising RPM

We track ad RPM for our non-subscription, ad-supported service because it is a key indicator of our ability to monetize advertising inventory created by our listener hours. We focus on ad RPM across all of our delivery platforms. We believe ad RPM to be the central top-line indicator for evaluating the results of our advertising monetization efforts. Ad RPM is calculated by dividing advertising revenue by the number of thousands of listener hours for our advertising-based service.

Advertising LPM

We track ad LPM for our non-subscription, ad-supported service across all delivery platforms. Prior to September 15, 2016, the content acquisition costs included in our ad LPM calculations were relatively fixed, with scheduled annual rate adjustments as specified by the Section 114 Rates. Subsequent to September 15, 2016, the content acquisition costs included in our ad LPM calculations are based on the rates set by our license agreements with record labels, PROs and music publishers or the Section 114 Rates if we have not entered into a license agreement with the copyright owner of a particular sound recording.

The table below sets forth our RPM and LPM for our ad-supported service for the years ended December 31, 2015, 2016 and 2017.

	Year ended December 31,
	2015				2016				2017
	RPM*		LPM		RPM*		LPM		RPM*		LPM
Advertising	$	50.52	$	26.13	$	55.94	$	32.40	$	65.32	$	35.70
*The calculation of RPM does not include revenue generated by Ticketfly or Next Big Sound.

Advertising RPM

For the year ended December 31, 2017 compared to 2016, the increase in ad RPM was primarily due to the increase in the number of ads sold per hour, due in part to an increase in the number of audio ads played.

For the year ended December 31, 2016 compared to 2015, ad RPM increased primarily due to the increase in advertising revenue outpacing the growth in advertising listener hours as a result of an increase in the average price per ad sold.

Advertising LPM

Total ad LPMs in the year ended December 31, 2017 compared to 2016 increased primarily due to rate increases and minimum guarantee accruals related to our direct license agreements with major and independent labels, distributors, PROs and publishers in comparison to the statutory rates used to calculate our content acquisition costs for the majority of the year ended December 31, 2016.

Total ad LPM in the year ended December 31, 2016 compared to 2015 increased primarily due to an increase in content acquisition costs subject to the license agreements for recorded music with major and independent labels, distributors, PROs and publishers that were signed in 2015 and 2016. The increase was partially offset by one-time cumulative charges in the year ended December 31, 2015 of $57.9 million for the pre-1972 sound recordings settlement and $23.9 million as a result of management's decision to forgo the application of the RMLC publisher royalty rate from June 2013 to September 2015.

Subscription Services—Total

Paid Subscribers

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Paid subscribers are defined as the number of distinct users that have current, paid access to our subscription service as of the end of the period. We track paid subscribers because it is a key indicator of the growth of our subscription services.

The below table sets forth our paid subscribers as of December 31, 2016 and 2017.

	As of December 31,
	2016	2017
	(in millions)
Paid subscribers	4.39	5.48

ARPU and LPU

ARPU is defined as average monthly revenue per paid subscriber on our subscription services. LPU is defined as average monthly licensing costs per paid subscriber on our subscription services. We believe ARPU to be the central top-line indicator for evaluating the results of our monetization efforts on our subscription services. We track LPU because it is a key measure of our ability to manage costs for our subscription services. The below table sets forth our ARPU and LPU for our subscription services for the quarters ended December 31, 2016 and 2017 and the year ended December 31, 2017.

	Quarter ended   December 31,		Year ended   December 31,
	2016	2017	2016	2017
Subscription ARPU	4.73	6.08	N/A	5.34
Subscription LPU	3.12	4.41	N/A	3.62

Subscription ARPU

For the quarter ended December 31, 2017 compared to 2016, the increase in subscription ARPU is primarily due to the increase in subscription revenue outpacing the increase in subscribers due to the fact that Pandora Premium launched in 2017 at a higher price point than Pandora Plus.

Subscription LPU

For the quarter ended December 31, 2017 compared to 2016, the increase in subscription LPU was primarily due to an increase in content acquisition costs associated with Pandora Premium and minimum guarantee accruals related to our direct license agreements with major and independent labels, distributors, PROs and publishers.

Basis of Presentation and Results of Operations

The following table presents our results of operations for the periods indicated as a percentage of total revenue. Our results of operations for the year ended December 31, 2015 include operating results of Ticketfly for the two months ended December 31, 2015. Our results of operations for the year ended December 31, 2017 include operating results of Ticketfly for the period ended September 1, 2017. The period-to-period comparisons of results are not necessarily indicative of results for future periods.

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	Year ended December 31,
	2015		2016		2017
Revenue
Advertising	80	%	77	%	73	%
Subscription and other	19		16		22
Ticketing service	1		6		5
Total revenue	100		100		100
Cost of revenue
Cost of revenue—Content acquisition costs	52		53		55
Cost of revenue—Other (1)	7		7		8
Cost of revenue—Ticketing service (1)	1		4		3
Total cost of revenue	60		65		66
Gross profit	40		35		34
Operating expenses
Product development (1)	7		10		11
Sales and marketing (1)	34		35		34
General and administrative (1)	13		13		13
Goodwill impairment	—		—		9
Contract termination fees	—		—		2
Total operating expenses	55		58		68
Loss from operations	(15	)	(23	)	(34	)
Interest expense	—		(2	)	(2	)
Other income, net	—		—		—
Total other expense, net	—		(2	)	(2	)
Loss before (provision for) benefit from income taxes	(15	)	(25	)	(35	)
(Provision for) benefit from income taxes	—		—		—
Net loss	(15	)%	(25	)%	(35	)%
Net loss available to common stockholders	(15	)%	(25	)%	(38	)%

(1) Includes stock-based compensation as follows:
Cost of revenue—Other	0.5	%	0.4	%	0.2	%
Cost of revenue—Ticketing service	—		—		—
Product development	2.0		2.2		2.3
Sales and marketing	4.5		4.2		3.8
General and administrative	2.5		3.1		2.4
Note: Amounts may not recalculate due to rounding

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Revenue 

	Year ended   December 31,						Year ended   December 31,
	2015		2016		$ Change		2016		2017		$ Change
	(in thousands)						(in thousands)
Revenue
Advertising	$	933,305	$	1,072,490	$	139,185	$	1,072,490	$	1,074,927	$	2,437
Subscription and other	220,571		225,786		5,215		225,786		315,853		90,067
Ticketing service	10,167		86,550		76,383		86,550		76,032		(10,518		)
Total revenue	$	1,164,043	$	1,384,826	$	220,783	$	1,384,826	$	1,466,812	$	81,986

Advertising revenue

We generate advertising revenue primarily from audio, display and video advertising, which is typically sold on a cost-per-thousand impressions, or CPM, basis. Advertising campaigns typically range from one to twelve months, and advertisers generally pay us based on the number of delivered impressions or the satisfaction of other criteria, such as click-through rates. For the years ended December 31, 2015, 2016 and 2017, advertising revenue accounted for 80%, 77% and 73%, of our total revenue, respectively. We expect that advertising will comprise a substantial majority of revenue for the foreseeable future.

For the year ended December 31, 2017 compared to 2016, advertising revenue increased $2.4 million or 0.2% due to the average price per ad and the number of ads sold remaining relatively flat compared to the prior year.

For the year ended December 31, 2016 compared to 2015, advertising revenue increased by $139.2 million or 15%, primarily due to an increase in the average price per ad sold.

Subscription and other revenue

Subscription and other revenue is generated primarily through the sale of monthly or annual subscriptions to Pandora Plus and Pandora Premium. Pandora Plus is a paid, ad-free version of the Pandora service that includes replays, additional skipping, offline listening, higher quality audio on supported devices and longer timeout-free listening. Pandora Premium is a paid, ad-free version of the Pandora service that also offers a unique, on-demand experience, providing users with the ability to search, play and collect songs and albums, build playlists on their own or with the tap of a button and automatically generate playlists based on their listening activity. Subscription revenue is recognized on a straight-line basis over the duration of the subscription period. For the years ended December 31, 2015, 2016 and 2017, subscription and other revenue accounted for 19%, 16% and 22% of our total revenue, respectively. 

For the year ended December 31, 2017 compared to 2016, subscription revenue increased $90.1 million or 40%, primarily due to an increase in the number of subscribers and an increase in the average price per paid subscriber due to the launch and growth of Pandora Premium.

For the year ended December 31, 2016 compared to 2015, subscription and other revenue increased by $5.2 million or 2%, primarily due to an increase in the number of subscribers.

Ticketing service

Ticketing service revenue was generated primarily from service and merchant processing fees generated on ticket sales through the Ticketfly platform. Ticketfly sold tickets to fans for events on behalf of clients and charged either a fee per ticket or a percentage of the total convenience charge and order processing fee for its services at the time the ticket for an event was sold. Ticketing service revenue was recorded net of the face value of the ticket at the time of the sale, as Ticketfly generally acted as the agent in these transactions. For the years ended December 31, 2015, 2016 and 2017, ticketing service revenue accounted for approximately 1%, 6% and 5% of our total revenue, respectively. On September 1, 2017, we completed the sale of Ticketfly to Eventbrite. Ticketing service revenue is included in our Consolidated Statements of Operations for the period from the acquisition date of October 31, 2015 to the disposition date of September 1, 2017. Refer to Note 5 "Dispositions" in the Notes to Consolidated Financial Statements for further details on the Ticketfly disposition.

For the year ended December 31, 2017 compared to 2016, ticketing service revenue decreased $10.5 million or 12%,

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primarily due to a decrease in the number of tickets sold, excluding box office sales, as a result of the sale of Ticketfly on September 1, 2017.

Deferred revenue

Our deferred revenue consists primarily of prepaid but unrecognized subscription revenue and, to a lesser extent, advertising fees received or billed in advance of the delivery or completion of the delivery of services. Deferred revenue is recognized as revenue when the services are provided and all other revenue recognition criteria have been met.

In addition, subscription revenue derived from sales through certain mobile device app stores may be subject to refund or cancellation terms which may affect the timing or amount of the subscription revenue recognition. When refund rights exist, we recognize revenue when services have been provided and the rights lapse or when we have developed sufficient transaction history to estimate a return reserve. 

Costs and Expenses

Cost of revenue consists of cost of revenue—content acquisition costs, cost of revenue—other and cost of revenue—ticketing. Our operating expenses consist of product development, sales and marketing, general and administrative costs, goodwill impairment and contract termination fees. Cost of revenue—content acquisition costs are the largest component of our costs and expenses, followed by employee-related costs, which include stock-based compensation expenses.

Cost of revenue—Content acquisition costs

	Year ended   December 31,						Year ended   December 31,
	2015		2016		$ Change		2016		2017		$ Change
	(in thousands)						(in thousands)
Cost of revenue—Content acquisition costs	$	610,362	$	734,353	$	123,991	$	734,353	$	804,032	$	69,679

Cost of revenue-content acquisition costs primarily consist of licensing fees paid for streaming music or other content to our listeners. In the year ended December 31, 2016, we obtained the rights to stream the majority of sound recordings on our service through statutory licenses, with the costs for such licenses determined according to the per-play rates set by the CRB. We obtained the rights to the majority of the musical works streamed on our service through direct licensing agreements with PROs or publishers, with the costs for such licenses based on a percentage of the content acquisition costs we paid for sound recordings.

During the year ended December 31, 2017, the majority of our content acquisition costs were calculated using negotiated rates in direct license agreements with record labels, music publishers and PROs. Depending on the applicable service, our sound recording license agreements generally require us to pay either a per-performance fee based on the number of sound recordings we transmit, a percentage of revenue associated with the service, or a per-subscriber minimum amount.

For our ad-supported service, the majority of our content acquisition costs for musical works are based on a percentage of content acquisition costs paid for sound recordings.

For our subscription services, content acquisition costs for musical works are determined in accordance with the statutory license set forth in 17 U.S.C. §115. Certain of our direct license agreements are also subject to minimum guarantee payments, some of which are paid in advance and amortized over the minimum guarantee period. For certain content acquisition arrangements, we accrue for estimated content acquisition costs based on the available facts and circumstances and adjust these estimates as more information becomes available. For additional information, see above in "Factors Affecting Our Business Model—Content Acquisition Costs".

For the year ended December 31, 2017 compared to 2016, content acquisition costs increased $69.7 million or 9%, and total content acquisition costs as a percentage of total revenue increased from 53% to 55%. As we entered into direct license agreements with major and independent labels, distributors, PROs and publishers, we experienced rate increases and minimum guarantee accruals as compared to the statutory rates used to calculate our content acquisition costs for the majority of the year ended December 31, 2016. These rates particularly impacted our subscription services. As we launched Pandora Premium and experienced growth in our subscription services in 2017, this resulted in a corresponding increase in content acquisition costs as dictated by these direct license agreements.

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For the year ended December 31, 2016 compared to 2015, content acquisition costs increased by $124.0 million or 20%, and total content acquisition costs as a percentage of total revenue increased from 52% to 53%, primarily due to rate increases and minimum guarantee accruals related to our direct license agreements with major and independent labels, distributors, PROs and publishers that went into effect beginning September 2016. The increase was partially offset by one-time cumulative charges in the year ended December 31, 2015 of $57.9 million for the pre-1972 sound recordings settlement and $23.9 million as a result of management's decision to forgo the application of the RMLC publisher royalty rate from June 2013 to September 2015.

Cost of Revenue—Other

	Year ended   December 31,						Year ended   December 31,
	2015		2016		$ Change		2016		2017		$ Change
	(in thousands)						(in thousands)
Cost of revenue—Other	$	79,972	$	102,717	$	22,745	$	102,717	$	112,638	$	9,921

Cost of revenue—other consists primarily of ad and music serving costs, employee-related costs, facilities and equipment costs, other costs of ad sales and amortization expense related to acquired intangible assets and internal-use software. In the year ended December 31, 2017 we reallocated headcount from cost of revenue—other to other financial statement line items due to a reorganization of the company as a result of a reallocation of resources. Ad and music serving costs consist of content streaming, maintaining our streaming radio and on-demand subscription services and creating and serving advertisements through third-party ad servers. We make payments to third-party ad servers for the period the advertising impressions are delivered or click-through actions occur, and accordingly, we record this as a cost of revenue in the related period. Employee-related costs include salaries and benefits associated with supporting music and ad-serving functions. Other costs of ad sales include costs related to music events that are included as part of certain of our advertising arrangements.

For the year ended December 31, 2017 compared to 2016, cost of revenue—other increased $9.9 million or 10%, primarily due to an $11.2 million increase in amortization expense of internal-use software and acquired intangible assets related to the launch of Pandora Premium, a $5.0 million increase in other cost of ad sales and a $4.8 million increase in hosting and ad serving costs driven by an increase in the cost of ad sales. The increase is offset by an $11.6 million decrease in employee-related costs driven by a decrease in average headcount related to a reorganization of the company as a result of a reallocation of resources and a reduction in force in the first quarter of 2017.

For the year ended December 31, 2016 compared to 2015, cost of revenue—other increased by $22.7 million or 28%, primarily due to a $6.0 million increase in employee-related expenses and a $3.3 million increase in facilities and equipment costs driven by an increase in average headcount, a $7.4 million increase in hosting and ad-serving costs and a $3.0 million increase in cost of ad sales driven by an increase in the number of ads sold, a $1.7 million increase in amortization expense of internal-use software and a $1.1 million increase in costs related to music events that are sold as part of our advertising arrangements.

Cost of revenue—ticketing service

	Year ended   December 31,						Year ended   December 31,
	2015		2016		$ Change		2016		2017		$ Change
	(in thousands)						(in thousands)
Cost of revenue—Ticketing service	$	7,121	$	59,280	$	52,159	$	59,280	$	50,397	$	(8,883	)

Cost of revenue—ticketing service consists primarily of ticketing revenue share costs, hosting costs, credit card fees and other cost of revenue and intangible amortization expense. The majority of these costs are related to revenue share costs which consist of fees paid to clients for their share of convenience and order processing fees. Intangible amortization expense is related to amortization of developed technology acquired in connection with the Ticketfly acquisition on October 1, 2015. On September 1, 2017, we completed the sale of Ticketfly to Eventbrite. Cost of revenue—ticketing service is included in our Consolidated Statements of Operations for the period from the acquisition date of October 31, 2015 to the disposition date of

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September 1, 2017. Refer to Note 5 "Dispositions" in the Notes to Consolidated Financial Statements for further details on the Ticketfly disposition.

For the year ended December 31, 2017 compared to 2016, cost of revenue—ticketing service decreased $8.9 million or 15%, primarily due to the sale of Ticketfly on September 1, 2017.

Gross margin

	Year ended   December 31,								Year ended   December 31,
	2015			2016			$ Change		2016			2017			$ Change
	(in thousands)								(in thousands)
Gross profit
Total revenue	$	1,164,043		$	1,384,826		$	220,783	$	1,384,826		$	1,466,812		$	81,986
Total cost of revenue	697,455			896,350			198,895		896,350			967,067			70,717
Gross profit	$	466,588		$	488,476		$	21,888	$	488,476		$	499,745		$	11,269
Gross margin	40		%	35		%			35		%	34		%

For the year ended December 31, 2017 compared to 2016, gross margin decreased from 35% to 34%, as the growth in cost of revenue—content acquisition costs outpaced the growth in revenue. As we entered into direct license agreements with major and independent labels, distributors, PROs and publishers, we experienced rate increases and minimum guarantee accruals as compared to the statutory rates used to calculate our content acquisition costs for the majority of the year ended December 31, 2016. These rates particularly impacted our subscription services. As we launched Pandora Premium and experienced growth in our subscription services in 2017, this resulted in a corresponding increase in content acquisition costs as dictated by these direct license agreements.

For the year ended December 31, 2016 compared to 2015, gross margin decreased from 40% to 35%, as the growth in content acquisition costs outpaced the growth in revenue, primarily due to rate increases and minimum guarantee accruals related to our direct license agreements with major and independent labels, distributors, PROs and publishers that went into effect in September 2016.

Product development

	Year ended   December 31,						Year ended   December 31,
	2015		2016		$ Change		2016		2017		$ Change
	(in thousands)						(in thousands)
Product development	$	84,135	$	140,707	$	56,572	$	140,707	$	154,325	$	13,618

Product development consists primarily of employee-related costs, including salaries and benefits related to employees in software engineering, music analysis and product management departments, facilities and equipment costs, information technology costs and amortization expense related to acquired intangible assets. We incur product development expenses primarily for improvements to our website and the Pandora app, development of new services and enhancement of existing services, development of new advertising products and development and enhancement of our personalized playlisting system. We have generally expensed product development as incurred. These amounts are offset by costs that we capitalize to develop software for internal use. Certain website development and internal use software development costs are capitalized when specific criteria are met. In such cases, the capitalized amounts are amortized over the useful life of the related application once the application is placed in service.

For the year ended December 31, 2017 compared to 2016, product development expenses increased $13.6 million or 10%, primarily due to a $8.4 million decrease in capitalized personnel costs driven by an increase in costs for maintenance of and minor enhancements to Pandora Premium that were not capitalized. The increase is also due to an increase in employee related costs, excluding capitalized personnel, of $7.3 million and a $2.9 million increase in facilities and equipment costs as a result of an increase in average headcount. This was offset by a $5.0 million decrease in amortization expense of acquired intangible assets.

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For the year ended December 31, 2016 compared to 2015, product development expenses increased by $56.6 million or 67%, primarily due to a $59.2 million increase in employee-related costs and a $7.5 million increase in facilities and equipment costs driven by an increase in average headcount, a $6.6 million increase in intangible amortization expense and a $4.0 million increase in professional fees, offset by a $22.3 million increase in costs that we capitalized to develop software for internal use.

Sales and marketing

	Year ended   December 31,						Year ended   December 31,
	2015		2016		$ Change		2016		2017		$ Change
	(in thousands)						(in thousands)
Sales and marketing	$	397,842	$	490,364	$	92,522	$	490,364	$	492,542	$	2,178

Sales and marketing consists primarily of employee-related costs, including salaries, commissions and benefits related to employees in sales, sales support, marketing, advertising and industry relations and artist marketing departments and facilities and equipment costs. In addition, sales and marketing expenses include commissions on subscription purchases through mobile app stores ("subscription commissions"), external sales and marketing expenses such as brand marketing, advertising, customer acquisition, direct response and search engine marketing costs, public relations expenses, costs related to music events, agency platform and media measurement expenses and amortization expense related to acquired intangible assets.

For the year ended December 31, 2017 compared to 2016, sales and marketing expenses increased $2.2 million or 0.4%, primarily due to a $10.3 million increase in subscription commissions driven by an increase in subscribers as a result of the launches of Pandora Plus and Pandora Premium and a $4.5 million increase in facilities and equipment costs due to an increase in expensed software. This was offset by a $5.9 million decrease in employee-related costs driven by a decrease in average headcount, a $3.8 million decrease in amortization expense of acquired intangible assets and a $1.3 million decrease in professional fees.

For the year ended December 31, 2016 compared to 2015, sales and marketing expenses increased by $92.5 million or 23%, primarily due to a $45.5 million increase in employee-related costs and a $9.1 million increase in facilities and equipment costs driven by an increase in average headcount, a $22.1 million increase in brand marketing, advertising, direct response and search engine marketing costs driven by advertising campaigns launched in 2016, a $5.8 million increase in intangible amortization expense and a $5.0 million increase in amortization of non-recoupable ticketing contract advances.

General and administrative

	Year ended   December 31,						Year ended   December 31,
	2015		2016		$ Change		2016		2017			$ Change
	(in thousands)						(in thousands)
General and administrative	$	154,602	$	176,164	$	21,562	$	176,164	$	190,711	<