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Rubicon Project

rubi · NYSE Industrials
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Ticker rubi
Exchange NYSE
Sector Industrials
Industry Marine Shipping
Employees 501-1000
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FY2018 Annual Report · Rubicon Project
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2018

ANNUAL REPORT

rubiconproject.com

I’m pleased to report that in 2018, we saw continued solid progress in our business following 
the challenging strategic and cost-cutting actions we undertook in 2017 and early 2018.  
The hard work over the last two years led to a return to revenue growth by the end of the 
year, with a 32% year-over-year increase in revenue in the fourth quarter.

On profitability metrics, we achieved our goal of becoming adjusted EBITDA positive in the 
fourth quarter. Importantly we also generated positive cash flow, excluding working capital 
swings, in the fourth quarter—a full year ahead of our stated target. The fourth quarter  
also demonstrated the potential of our high-leverage financial model with adjusted EBITDA  
margins of 24%. These achievements were seasonally aided, but represented important 
milestones in our recovery. 

Now that we have returned to growth and greatly improved our financial performance,  
we are playing offense again and planning for future growth in 2019 and beyond. In 2019,  
we believe growth will largely be driven by continued consolidation of supply by buyers, 
known as Supply Path Optimization (SPO), together with strong growth in our video business. 
Video represented 16% of our revenue and advertising spend in 2018, and more than doubled 
year over year in the fourth quarter. We believe we are very well and broadly positioned  
in video to continue to outpace industry growth and that we have the foundation to benefit  
from the growth of connected TV, which we believe will be significant in the future.

On the product side, we made significant investments in header bidding and specific  
buyer products and tools over the last two years. For 2019, we are increasing our focus  
and product development efforts to address the challenges and complexities faced by our 
seller/publisher clients as they seek to optimize revenue and thrive in the rapidly evolving 
world of programmatic advertising.

While much work remains, we are pleased with our strong balance sheet, our financial 
progress, our product development efforts, and our progress in understanding and  
addressing the needs of our clients.

I thank our stockholders for all your support, our employees for their hard work, and 
our board for their sound advice and counsel. I am honored and excited to lead this great 
team that is making solid progress in the journey of returning Rubicon Project back to  
its place as an industry leader.

 Regards,

Michael Barrett
President & CEO, Rubicon Project

 
 
 
 
 
 
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
__________________

FORM 10-K
__________________
 (Mark One)

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

For the fiscal year ended December 31, 2018 
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: 001-36384
__________________

THE RUBICON PROJECT, INC.
(Exact name of registrant as specified in its charter)
 __________________

Delaware

(State or other jurisdiction of incorporation or
organization)

20-8881738
(I.R.S. Employer Identification No.)

12181 Bluff Creek Drive, 4th Floor

Los Angeles, CA 90094

(Address of principal executive offices, including zip code)

Registrant's telephone number, including area code:
(310) 207-0272

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

Title of each class

Common Stock, $0.00001 par value

Name of each exchange on which registered

New York Stock Exchange

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

 __________________

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.   

 Yes 

 No 

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.   

 Yes 

 No 

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 
 Yes    
been subject to such filing requirements for the past 90 days.   

 No  

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted 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 such files).  

 Yes    

 No   

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 the registrant's knowledge, in definitive proxy or information statements 
incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. 

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

Large accelerated filer  

Non-accelerated filer 

Emerging growth company 

Accelerated filer

Smaller reporting company 

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. 

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).   

 Yes 

  No

As of June 29, 2018, the aggregate market value of shares held by non-affiliates of the registrant (based on the closing sales price of such 
shares on the New York Stock Exchange on June 29, 2018) was approximately $138.7 million.

Indicate the number of shares outstanding of each of the registrant's classes of common stock, as of the latest practicable date.

Class
Common Stock, $0.00001 par value

Outstanding as of February 21, 2019
51,734,264

DOCUMENTS INCORPORATED BY REFERENCE

Related Section

Documents

III

Definitive Proxy Statement to be filed pursuant to
Regulation 14A on or before April 30, 2019

THE RUBICON PROJECT, INC.
FORM 10-K
FOR THE FISCAL YEAR ENDED DECEMBER 31, 2018 
TABLE OF CONTENTS

Special Note About Forward-Looking Statements

Part I

Item 1.

Business

Item 1A.

Risk Factors

Item 1B.

Unresolved Staff Comments 

Item 2.

Item 3.

Item 4.

Part II

Item 5.

Item 6.

Item 7.

Properties

Legal Proceedings

Mine Safety Disclosures

Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities 

Selected Financial Data

Management's Discussion and Analysis of Financial Condition and Results of Operations

Item 7A.

Quantitative and Qualitative Disclosures About Market Risk

Item 8.

Financial Statements and Supplementary Data

Item 9.

Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

Item 9A.

Controls and Procedures

Item 9B.

Other Information

Part III

Item 10.

Directors, Executive Officers and Corporate Governance

Item 11.

Executive Compensation

Item 12.

Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

Item 13.

Certain Relationships and Related Transactions, and Director Independence

Item 14.

Principal Accountant Fees and Services

Part IV

Item 15.

Exhibits, Financial Statement Schedules

Item 16.

Form 10-K Summary

Signatures

Page
No.

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18

50

50

51

51

52

52

53

68

69

103

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SPECIAL NOTE ABOUT FORWARD-LOOKING STATEMENTS 

This Annual Report on Form 10-K and related statements by the Company contain forward-looking statements, including 

statements based upon or relating to our expectations, assumptions, estimates, and projections. In some cases, you can identify 
forward-looking statements by terms such as "may," "might," "will," "objective," "intend," "should," "could," "can," "would," 
"expect," "believe," "design," "anticipate," "estimate," "predict," "potential," "plan" or the negative of these terms, and similar 
expressions. Forward-looking statements may include, but are not limited to, statements concerning our anticipated financial 
performance, including, without limitation, revenue, advertising spend, non-GAAP net revenue, non-GAAP earnings (loss) per 
share, profitability, net income (loss), Adjusted EBITDA, earnings per share, and cash flow; strategic objectives, including focus on 
header bidding, mobile, video, and private marketplace opportunities; investments in our business; development of our technology; 
introduction of new offerings; the impact of our acquisition of nToggle and its traffic shaping technology on our business; the effects 
of our cost reduction initiatives; scope and duration of client relationships; the fees we may charge in the future; business mix and 
expansion of our mobile, video, and private marketplace offerings; sales growth; client utilization of our offerings; our competitive 
differentiation; our market share and leadership position in the industry; market conditions, trends, and opportunities; user reach; 
certain statements regarding future operational performance measures including ad requests, fill rate, paid impressions, average 
CPM, take rate, and advertising spend; benefiting from supply path optimization; and factors that could affect these and other 
aspects of our business. These statements are not guarantees of future performance; they reflect our current views with respect to 
future events and are based on assumptions and estimates and subject to known and unknown risks, uncertainties and other factors 
that may cause our actual results, performance or achievements to be materially different from expectations or results projected or 
implied by forward-looking statements. These risks include, but are not limited to: 

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our ability to continue to grow and to manage our growth effectively;

our ability to develop innovative new technologies and remain a market leader;

our ability to attract and retain buyers and sellers and increase our business with them;

our vulnerability to loss of, or reduction in spending by, buyers;

our reliance on large sources of advertising demand;

our ability to maintain and grow a supply of advertising inventory from sellers and to fill the increased inventory;

the effect on the advertising market and our business from difficult economic conditions or uncertainty;

the freedom of buyers and sellers to direct their spending and inventory to competing sources of inventory and demand;

our ability to use our solution to purchase and sell higher value advertising and to expand the use of our solution by buyers
and sellers utilizing evolving digital media platforms;

our ability to introduce new offerings and bring them to market in a timely manner, and otherwise adapt in response to
client demands and industry trends;

the increased prevalence of header bidding and its effect on our competitive position;

uncertainty of our estimates and expectations associated with new offerings, including header bidding, private
marketplace, mobile, and video;

lower fees and take rate and the need to grow through advertising spend increases rather than fee increases;

our ability to compensate for a reduced take rate by increasing the volume and/or value of transactions on our platform
and increasing our fill rate;

our vulnerability to the depletion of our cash resources as we incur additional investments in products and technology;

our ability to support our growth objectives with reduced resources from our cost reduction initiatives;

our ability to raise additional capital if needed and/or to renew our working capital line of credit;

our limited operating history and history of losses;

our ability to continue to expand into new geographic markets;

our ability to adapt effectively to shifts in digital advertising;

increased prevalence of ad blocking or cookie blocking technologies;

the slowing growth rate of online desktop display advertising;

the growing percentage of online and mobile advertising spending captured by owned and operated sites (such as
Facebook and Google);

the effects, including loss of market share, of increased competition in our market and increasing concentration of
advertising spending, including mobile spending, in a small number of very large competitors;

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acts of competitors and other third parties that can adversely affect our business;

our ability to differentiate our offerings and compete effectively in a market trending increasingly toward commodification,
transparency, and disintermediation;

requests from buyers and sellers for discounts, fee concessions or revisions, rebates, refunds, favorable payment terms, and
greater levels of pricing transparency and specificity;

potential adverse effects of malicious activity such as fraudulent inventory and malware;

the effects of seasonal trends on our results of operations;

costs associated with defending intellectual property infringement and other claims;

our ability to attract and retain qualified employees and key personnel;

our ability to identify future acquisitions of or investments in complementary companies or technologies and our ability to
consummate the acquisitions and integrate such companies or technologies; and

our ability to comply with, and the effect on our business of, evolving legal standards and regulations, particularly
concerning data protection and consumer privacy and evolving labor standards.

We discuss many of these risks and additional factors that could cause actual results to differ materially from those

anticipated by our forward-looking statements under the headings "Risk Factors" and "Management's Discussion and Analysis of 
Financial Condition and Results of Operations," and elsewhere in this report and in other filings we have made and will make from 
time to time with the Securities and Exchange Commission, or SEC, including Quarterly Reports on Form 10-Q for 2019. These 
forward-looking statements represent our estimates and assumptions only as of the date of the report in which they are included. 
Unless required by federal securities laws, we assume no obligation to update any of these forward-looking statements, or to update 
the reasons actual results could differ materially from those anticipated, to reflect circumstances or events that occur after the 
statements are made. Without limiting the foregoing, any guidance we may provide will generally be given only in connection with 
quarterly and annual earnings announcements, without interim updates, and we may appear at industry conferences or make other 
public statements without disclosing material nonpublic information in our possession. Given these uncertainties, investors should 
not place undue reliance on these forward-looking statements. 

Investors should read this Annual Report on Form 10-K and the documents that we reference in this report and have filed 
or will file with the SEC completely and with the understanding that our actual future results may be materially different from what 
we expect. We qualify all of our forward-looking statements by these cautionary statements.

PART I

Item 1. Business Overview

We provide a technology solution to automate the purchase and sale of digital advertising inventory for buyers and sellers. 
Our platform features applications and services for digital advertising inventory sellers, including websites, mobile applications and 
other digital media properties, to sell their advertising inventory; applications and services for buyers, including advertisers, 
agencies, agency trading desks, and demand side platforms, or DSPs, to buy advertising inventory; and a marketplace over which 
such transactions are executed. Together, these features power and enhance a comprehensive, transparent, independent advertising 
marketplace that brings buyers and sellers together and facilitates intelligent decision-making and automated transaction execution 
for the advertising inventory we manage on our platform. Our clients include many of the world’s leading publishers of websites 
and mobile applications and buyers of digital advertising inventory.  

Advertising inventory takes different forms, referred to as advertising units, is purchased and sold through different 
transactional methodologies, and allows advertising content to be presented to users through different channels. Our solution 
enables buyers and sellers to purchase and sell:

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a comprehensive range of advertising units, including display, audio and video;

that are transacted through real-time bidding ("RTB"), which includes (i) direct sale of premium inventory, which
we refer to as private marketplace ("PMP"), and (ii) open auction bidding, which we refer to as open marketplace
("OMP"); and

that are displayed across digital channels, including mobile web, mobile application, and desktop, as well as
across various out-of-home channels, such as digital billboards.

We believe our platform reaches approximately one billion users globally. Sellers of digital advertising inventory use our 

platform to generate revenue by monetizing their advertising inventory across transaction types, advertising units, and channels 

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through accessing a global market of buyers representing top advertiser brands. We also help sellers decrease costs and protect their 
brands and user experience.

At the same time, buyers leverage our platform to manage their advertising spending and reach their target audiences 
across transaction types, advertising units, and channels, simplify order management and campaign tracking, obtain actionable 
insights into audiences for their advertising, and access impression-level purchasing from hundreds of sellers. 

We generate revenue from the buying and selling of digital advertising inventory transacted on our platform. Digital 

advertising inventory is created when users access sellers’ content. Sellers provide digital advertising inventory to our platform in 
the form of advertising requests, or ad requests. When we receive ad requests from sellers, we send bid requests to buyers, which 
enable buyers to bid on sellers’ digital advertising inventory. Winning bids can place advertising, or paid impressions, for the seller 
to present to the user. The volume of paid impressions measured as a percentage of ad requests is referred to as fill rate. The price 
that buyers pay for each thousand paid impressions purchased is measured in units referred to as CPM. We refer to the total volume 
of spending between buyers and sellers on our platform as advertising spend. We keep a percentage of that advertising spend as a 
fee, and we pass the rest through to the seller. The fee that we retain from the gross advertising spend on our platform is our 
revenue. Our fee, measured as a percentage of advertising spend, is referred to as our take rate. 

Our platform incorporates proprietary machine-learning algorithms, sophisticated data processing, robust high-volume 

analytics capabilities, and a distributed infrastructure. Our solution is constantly improving based on our systems’ ability to process 
and learn from vast volumes of data in real time.

During the early stages of our business following our incorporation in April 2007, our solution matched sellers’ inventory 
to appropriate buyers by offering impressions to different buyers in sequence. During 2010, we added RTB capabilities, creating a 
real-time open-market auction allowing all buyers accessing our platform to compete to purchase all of the advertising inventory 
that sellers made available to our platform. During 2012, we launched our PMP application, which allows sellers to connect directly 
with their pre-approved buyers to execute direct sales of previously unsold advertising inventory. 

In 2016, we introduced our header bidding solution. In addition, we began to focus further on development of our video 

solution, helping grow our product footprint to allow our sellers to sell video advertising inventory across desktop or mobile 
platforms, and include instream, outstream and mobile-specific formats such as interstitials. 

In 2017, we acquired nToggle, Inc. ("nToggle"), a provider of technology to make it easier and more cost effective for 
programmatic buyers to find the inventory they are looking for among the billions of bid requests they receive each day. Header 
bidding has dramatically increased the volume of bid requests sent to buyers, increasing buyers’ processing costs and making it 
more difficult for them to find the impressions they want. nToggle technology utilizes analytical and data science techniques to help 
shape real-time bidding requests, optimize traffic, and reduce the number of duplicates and irrelevant bid requests DSPs must 
process. The technology also helps us manage our infrastructure costs and increase our aggregate ingestion capacity by filtering out 
impressions that are not in demand before they are processed through the bid stream. The technology also allows us to optimize 
traffic toward DSPs and buyers based on their unique, historical buying behaviors, leading to an overall expansion of relevant bid 
requests to DSPs unable or unwilling to process the full stream of real-time bidding requests available from our platform.

In 2018, we made first-price our default auction dynamic for header bidding due to increased competition inherent in 

header bidding, which led other exchanges to submit bids on a first-price basis, rendering our second-price auction methodology 
less competitive. This allowed us to improve the rate at which we win header-bidding auctions. To support buyers that needed some 
time to adapt their systems and bidding strategies to first-price auction dynamics, or may not want to make those adaptations 
themselves, we developed our Estimated Market Rate (“EMR”) feature. This feature uses algorithms that monitor existing market 
conditions against our dataset of auction outcomes to look for opportunities to reduce the amount of the bid that we pass through to 
the downstream auction on behalf of our winning bidder, while maintaining high fill rates. This is intended to help buyers avoid 
overpaying for impressions while providing sellers with more stable, predictable demand.

We operate our business on a worldwide basis, with an established operating presence in North America and Europe and a 
developing presence in Asia, Australia, and South America. Substantially all of our assets are U.S. assets. Our non-U.S. subsidiaries 
and operations perform primarily sales, marketing, and service functions. 

Recent Developments

The ad tech market is demanding more efficiency and lower cost from intermediaries like us. In an effort to be more 

competitive in attracting demand and capturing inventory supply, we made a strategic decision in mid-2017 to reduce the fees we 
charged buyers in OMP transactions. In addition, in 2017 our business mix shifted to a higher proportion of header bidding 
transactions, and we charged lower buyer fees for header bidding transactions in order to pass higher bids to the downstream 

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decisioning process. Finally, in response to increasing market pressure and in an effort to be more competitive, on November 1, 
2017, we eliminated our buyer transaction fees altogether. Throughout 2018, our focus was to increase the volume of transactions 
we process in order to offset the lower fees. 

Buyer transaction fees represented approximately 49% of our revenue for the first ten months of 2017, which is the period 

during which we charged buyer fees in 2017, and represented approximately 43% of our revenue in 2017. Consequently, the 
elimination of our buyer transaction fees had a severe adverse effect on our revenue and margins since there were no buyer fees 
included in revenue for 2018. A critical part of our plan to adjust to our lower take rates is to increase advertising spending on our 
platform and operate with improved efficiency that will support lower margins. To increase our advertising spend, we have taken 
steps to increase significantly the ad requests coming from our seller clients. Our plans for increasing our inventory volumes have 
included active pursuit of more direct relationships with sellers, particularly of mobile, video, and PMP impressions, which are areas 
of industry growth. We have increased our access to ad requests that might not otherwise be accessible to us by utilizing header 
bidding technologies, including our own solution built on the Prebid open source architecture we helped advance, as well as third-
party wrappers, and also integrating with large sources of supply that have their own monetization capabilities but also allow third 
parties to connect to their exchanges and bid on their inventory. 

The industry-wide growth of header bidding has given us access to more advertising inventory, but has also exposed 

inventory to more competing sources of demand. As a result, we have significantly lower fill rates for header bidding transactions, 
and as the percentage of our overall transactions conducted through header bidding increases, our overall fill rates decrease. In an 
effort to increase our header bidding fill rates, in addition to our plans described above, we have made adjustments to our auction 
dynamics in header bidding transactions such as reducing timeouts, working with publishers to fix legacy publisher RTB rules files, 
increasing the number of user match rates across multiple devices, and fixed other technical mapping related issues. Historically, we 
conducted our RTB auctions based upon second-price principles, consistent with widespread industry practice. However, as header 
bidding increased competition for available inventory, some competing exchanges began submitting bids in header bidding auctions 
on a first-price or modified-first-price basis to increase their chances of winning. This put our buyers at a competitive disadvantage 
in these transactions and also created some confusion in the market, as it was often unclear how competing buyers were formulating 
their bids. In an effort to capture more inventory for our buyers and deliver better monetization to our sellers, and to provide better 
transparency and predictability to all our clients, effective as of January 22, 2018, we made first price our default auction dynamic 
for header bidding transactions. This means that the first price or highest bid in our auction wins and that first price is passed to the 
downstream auction. Because buyers may need some time to adapt their systems and bidding strategies to first-price auction 
dynamics, or may not wish to make those adaptations themselves, we have implemented an optional feature called EMR, described 
above. 

Supply Path Optimization, or SPO, is a new practice emerging in 2018 referring to the practice of deliberately choosing a 

specific source of supply through which buyers will procure their media. SPO is important to buyers because it can help reduce their 
costs and gain efficiencies, and largely because of header bidding, they are able to choose the best partner (or small number of 
partners) without limiting the available inventory to bid on. There are a number of criteria that buyers use to evaluate supply 
partners, including transparency, cost, the quality of the inventory, and whether or not a supply partner meets standards around 
ads.txt compliance, GDPR compliance, brand safety, and remediation of fraudulent traffic. We believe we are well positioned to 
benefit from supply path optimization due to being a lower-cost provider as a result of the removal of buyer fees, our EMR feature, 
our transparency, and our brand safety measures.

While we work to increase the volume of transactions on our exchange and compete more effectively, we must operate 

efficiently to relieve the pressure on our margins and cash resources that has resulted from our fee reductions and increased 
infrastructure required to support the increased volume of bid requests generated through header bidding and the increased volume 
of transactions that our growth plans require. We believe that increasing our revenue through transaction volume while still offering 
competitive fees to our buyers and sellers, paired with cost reduction measures we undertook in 2018 and ongoing cost discipline, 
will establish us as a lower cost exchange. Our cost reduction measures have included headcount reductions of approximately 250 
people since late 2016, including approximately 100 people in 2018, driving an overall workforce reduction of 39% from September 
30, 2016 to December 31, 2018. In the first quarter of 2018, we undertook various cost control initiatives including reductions in 
administrative staff to bring our general and administrative operations into better alignment with the current size of the business as 
well as in sales and technical personnel as a result of offshoring certain development functions, organizational delayering and 
restructuring, and reducing investment in unprofitable projects (see Note 14 of our "Notes to Consolidated Financial Statements"). 
As a result of our 2018 workforce reductions, combined with other non-headcount related operating expense reductions we 
undertook, we achieved our target of positive adjusted EBITDA in the fourth quarter of 2018. In addition, we have reduced our 
capital expenditures to $19.9 million in 2018, which is less than half of the $40.4 million in capital expenditures incurred in 2017. 
We will continue to pursue increased automation and efficiency across all aspects of the company, including our technology stack. 

As a result of these efforts to increase the volume of advertising inventory transacted on our platform, we increased our 

advertising spend from $837.2 million in 2017 to $992.1 million in 2018. We have also been able to increase our revenue 

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throughout 2018, despite a year-over-year decrease from 2017 due to the inclusion of revenue from buyer fees for the majority of 
2017. Between continuing to generate increased advertising spend and stabilizing our take rate, we believe we are positioning 
ourselves for year-over-year revenue growth in future periods.

Our growth and cost-control strategies involve significant risk, as described in the “Risk Factors” section of this report.

Our Industry

Continued Shift Toward Digital Advertising

The increased delivery of content to users digitally over the Internet or through applications, as opposed to analog and print 

media, such as newspapers, magazines, broadcast radio, and television, has created an opportunity for buyers of advertising 
inventory to improve return on advertising investment by targeting audiences more accurately using data-driven strategies and 
delivering more relevant advertising in real time on multiple screens. Buyers are able to utilize various technologies to analyze data 
relating to return on investment, demographics, user behavior, location, and other attributes that enable them to create and deliver 
targeted advertisements to users, which helps achieve specific advertising goals. Technological advances have also enabled sellers to 
sell their inventory on an impression-by-impression basis, as well as in bulk, making it easier for sellers to enhance the monetization 
of their inventory. Therefore, advertising is continuing to shift with content to digital media.

Complicated and Manual Workflow for Direct Buying and Selling of Digital Advertising Inventory

Due to the size and complexity of the advertising ecosystem and purchasing process, manual processes cannot effectively 
manage digital advertising inventory at scale. In addition, both buyers and sellers are demanding more transparency, better controls 
and more relevant insights from their advertising inventory purchases and sales. Buyers and sellers benefit from a platform that 
enables them to leverage the targeting capabilities of their proprietary data assets. This has created a need to automate the digital 
advertising industry and to simplify the process of buying and selling advertising inventory.

A variety of factors make the digital advertising ecosystem highly complex and challenging to automate:

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Perishable Inventory. A user’s visit to a website or mobile application creates a unique opportunity to reach the
user by inserting advertisements into one or more of the impressions designed into the website or mobile
application. In order to generate revenue for a seller these impressions must be filled before the page content
loads.

Complex Impression-Level Matching. Sellers aim to sell impressions in order to generate revenue while
enhancing the users’ experience and preserving the sellers’ brand. Buyers seek to purchase impression-level
inventory to improve targeting of specific audiences and return on investment for their advertising spending.

Large Multi-Variate Datasets. Trillions of data points relating to browsing behavior, geographic information, user
preferences, engagement with an advertisement, and effectiveness of an advertisement are created as users visit
sellers’ websites and mobile applications. Each piece of data represents a valuable piece of information that can
facilitate and improve current and subsequent targeting and monetization of impressions.

Fragmented Buyer and Seller Base. There is an enormous number and variety of buyers and sellers of digital
advertising.

Brand Safety and Inventory Quality Concerns. Buyers want to avoid buying fraudulent or unauthorized
inventory or being associated with content they consider inappropriate, competitive, or inconsistent with their
advertising themes. Sellers want to prevent advertisements that are inappropriate, disruptive, competitively
sensitive, or otherwise do not comport with their brand image from appearing on their websites or mobile
applications, or that convey malware.

Consumer Experience Concerns. Consumers prefer digital advertising experiences that are relevant to their
personal interests, non-intrusive, and do not detract from or slow down their enjoyment of digital content.

Large and Highly Unpredictable Traffic Volumes. The scale of user traffic and the dollar value of digital
advertisements is growing and difficult to manage efficiently. A large seller may have tens of millions of users per
month, creating hundreds of millions of monthly impressions. The volume of traffic for any given seller is
extremely difficult to predict and requires a technology infrastructure that is large enough to handle variable
volumes. As more advertising shifts to digital and digital advertising technologies evolve, larger and more diverse
data processing capabilities are required.

Lack of Standardized Ad Formats and Data. An available advertising impression can vary based on a number of
factors, such as seller, ad format, screen size, pricing mechanism, content type, and audience demographic. It is

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challenging for buyers to efficiently evaluate and bid on trillions of impressions that are based on hundreds of ad 
formats in the context of millions of highly customized data fields.

Diverse Technology Demands. Even as advertising is shifting from traditional to digital media, a shift is
underway within the digital advertising ecosystem from desktop to mobile channels. Desktop and mobile digital
advertising involve different challenges and rely upon different technologies, requiring significant technological
capabilities and innovation.

Increasing Privacy Demands. Privacy protection is becoming increasingly important to regulators, technology
platforms, web and mobile browser applications and users on a regional and global basis, requiring constant
adaptation to comply with legal and self-regulatory requirements while effectively matching buyers and sellers of
inventory.

Rubicon Project: Competitive Strengths of Our Platform in the Digital Advertising Marketplace

Rubicon Project was founded to address the inherent challenges associated with the digital advertising ecosystem. Buyers 
can direct their spending towards the impressions that are of most value to them based on demographics, pricing, timing, and other 
targeting objectives. Sellers can improve revenue per impression, while adhering to their own specific rules around advertising that 
is permissible on their websites and mobile applications.

Serving a Broad Universe of Buyers and Sellers Across a Full Spectrum of Inventory Types, Advertising Units, and 

Channels Creates Network Effects

By accommodating a full spectrum of digital advertising inventory through various transaction types across multiple 
channels, our solution brings value to both buyers and sellers. Our sellers gain instant access to the world’s largest automated digital 
advertising buyers, including hundreds of DSPs with the flexibility to sell their advertising inventory in an automated fashion on an 
impression-by-impression basis, such as with OMP, in bulk, or in PMP transactions pursuant to arrangements directly between the 
seller and the buyer. Our buyers gain the ability to fulfill their audience needs in a cost-effective manner. Large numbers of diverse 
sellers on our platform attract more buyers and vice versa, resulting in a self-reinforcing network effect that adds value for all our 
clients and creates a strong platform for growth.

Private Marketplace Solutions Provide Unique Access to Quality Supply and Facilitate Transactions

A significant portion of premium inventory is purchased and sold through PMPs. Some sellers will continue to rely on their 

own sales forces for sales of premium inventory, but will benefit from automation to better price, match, and place campaigns, and 
to automate manual operations such as ad trafficking, quality assurance, and billing and collections. We have invested in workflow 
capabilities and automation of inventory transactions to enable sales teams to increase their productivity and process more sales of 
premium inventory at optimal prices. Workflow capabilities enable buyers and sellers to communicate directly and use shared data 
to execute campaigns. These capabilities support sales functions rather than replacing them, enhancing their adoption without 
friction. Buyers and sellers can also leverage their first-party data assets and third-party data assets in our platform to increase the 
value of sellers' inventory and the precision of buyers' targeting efforts. 

Big Data Analytics and Machine-Learning Algorithms

A core aspect of our value proposition is our big data and machine-learning platform that is able to discover unique insights 

from our massive data repositories containing proprietary information on ad requests, bid requests, bid responses, and served 
advertisements. Our systems collect and analyze variable pieces of information such as pricing of advertisements, historical clearing 
prices, bid responses, what types of ads are allowed on a particular website, which sellers’ websites a buyer prefers, what ad formats 
are available to be served, advertisement size and location, user location, which users a buyer wants to target, how many ads the 
user has seen, browser or device information, and sellers’ proprietary data about users. Our access to data puts us in a unique 
position to develop differentiated insights to help both buyers and sellers, and we have developed proprietary machine-learning 
algorithms that analyze trillions of these data points to enable our solution to make data-driven decisions in real time and to process 
high volumes of bid requests and responses. Our solution is constantly self-improving as we process more volume and accumulate 
more data, which in turn helps make our machine-learning algorithms more intelligent and contributes to higher-quality matching 
between buyers and sellers. This traffic optimization toward our DSP partners and buyers coupled with more aggressive filtering of 
non-monetizable traffic improves return on investment for buyers and increases revenue for sellers, which in turn attracts more 
buyers and sellers to our platform. We believe this self-reinforcing dynamic contributes to the dual network effects described above, 
creating a strong platform for growth.

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Header Bidding Solution

Header bidding is effectively a change in the auction process by which, instead of allocating an impression to one exchange 

running a single auction, a publisher exposes the impression to multiple exchanges, each of which generally selects a winning bid 
through its own initial auction and passes that winning bid into a secondary auction to compete for the impression with all other 
participating exchanges’ bids. Sellers first embraced header bidding using a client-side solution, in which the browser of the user 
creating the impression runs the secondary auction. This solution increases competition for impressions and raises impression 
prices, but burdening the browser to perform the secondary auction increases load time for content and causes delays during 
execution.  

An emerging alternative header bidding protocol uses a server to conduct the secondary auction, which can reduce load 

times but presents its own challenges. Adding an additional step between the user’s browser and the demand source can cause 
increased latency and limit the amount of user data that is transmitted, contributing to difficulties in user data synchronizing and 
resulting in adverse effects on audience targeting. Server-side technology also significantly increases the volume of demand sources 
that can be accommodated, resulting in increased competition for impressions. Further, the host of the server used in a particular 
transaction has an advantage in user sync with its demand sources, at least until some form of universal user identification approach 
gains significant market adoption.  

In 2016, we entered the client-side header bidding space with our client-side solution, which we referred to as FastLane. In 

2017, we began working on server-side header bidding and supported an open source industry solution we helped advance called 
Prebid. In October 2017, we launched our own open source server-side header bidding solution, which integrates with Prebid. Using 
these technologies, we are executing header bidding secondary auctions on behalf of our seller clients that implement our solution. 
To further the open source initiative, in 2017 we also helped to launch Prebid.org, Inc., an independent organization dedicated to the 
development and promotion of open-source header bidding solutions and other open-source tools to drive publisher monetization. 
There are two other primary server-side solutions, one provided by Amazon (called Amazon A9) and one provided by Google 
(called Google EB), and we are integrated with both. We believe the various header bidding alternatives we offer, our buyer reach 
and scale, our buying efficiency, and our machine learning capabilities put us in a strong position to compete for seller impressions, 
and we expect each of these header bidding solutions to deliver a meaningful volume of impressions.

Independence

Unlike some large industry participants, we do not have our own media properties that compete for advertising spending 
with our sellers. Our independence means we have none of the inherent conflicts of interests characterizing competing exchanges 
that sell their own inventory, giving our clients an important alternative to monetize and acquire inventory without subsidizing their 
competitors.

Platform Applications

To enhance the value our technology platform brings to the marketplace, we offer a number of applications to address the 

critical needs of buyers and sellers.

Applications for Sellers. We have direct relationships and integrations with the sellers on our platform. Our 

solution includes applications to help them increase their digital advertising revenue, reduce costs, protect their brands and 
user experience, and reach more buyers efficiently to increase digital advertising revenue by monetizing their full variety 
and volume of inventory. Our platform offers sellers many capabilities and benefits, including the following:

•

•

xAPI Technology That Allows Sellers to Easily Access Our Demand. Publishers normally face numerous
technical challenges in accessing advertising demand. They either have to modify their web pages by adding
cumbersome "ad tags," or they have to integrate monetization code into their mobile applications. Both of these
methods create technical risk and are time consuming to implement. xAPI technology eliminates these
requirements and makes it easy and fast with no impact to the web pages or apps of the publisher to access
demand and fill ad slots.

Integrated Solution for Digital Advertising Needs. We provide sellers with a single web-based interface that
serves as their central location to manage, analyze, and enhance digital advertising spending from hundreds of
different buyers.

• Header Bidding.  We provide our own header bidding solutions to sellers to use as a platform for aggregating

demand, and also to integrate with third-party header bidding solutions to provide demand to our sellers that use
those third-party solutions as their header bidding platform.

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•

•

•

•

•

•

•

•

•

Private Marketplaces.  Sellers can use our PMP capabilities to augment their own internal sales operations
through better matching and pricing and process automation.

Inventory Allocation. We offer a solution that helps sellers to increase revenue across advertising types and sales
channels by allocating inventory efficiently between direct and indirect demand.

Significantly Streamlined Sales, Operations, and Finance Workflow. Our platform streamlines the management
of digital advertisement sales by aggregating demand and providing a suite of software applications that automate
the process of making inventory available for sale.

Security for Brand and User Experience. Our platform is designed to enable sellers to implement guidelines
specifying what advertising content may not be shown on the seller’s website or mobile application.

Advanced Reporting and Analytics and Actionable Insights. We provide a robust set of reporting features that
sellers can use to analyze the vast array of data we collect for them.

Consolidated Payments. We provide consolidated billing and collection for sellers that would otherwise be
required to dedicate additional resources to cost-effectively manage financial relationships with a large base of
buyers.

Protective Screening. We employ measures to protect sellers and users from malware (software that can infect
computers with malicious software), check advertisements delivered through our solution for the presence of
malicious or questionable activity or characteristics, and gather technical attributes to inform our matchmaking
process.

Vantage. We provide an extension for Web browsers that lets sellers monitor ads served in context on their sites,
providing insight, diagnostic applications, and ad-quality controls.

Creative Approval API. Our platform includes a programmatic interface that sellers can use to retrieve a
comprehensive set of individual advertising creatives that have bid or served on their sites, and instruct our
delivery systems to approve or reject those creatives for future impressions.

Applications for Buyers. Buyers leverage our applications to access a large audience and execute highly
automated campaigns that take advantage of unique targeting data and technology as provided by our platform to purchase 
advertising inventory based on buyers' key demographic, economic, and timing criteria. These applications help streamline 
a buyer’s purchasing operations and increase the efficiency of its spending and the effectiveness of its advertising 
campaigns. Our platform offers buyers many capabilities and benefits, including the following:

•

•

•

•

•

•

•

Direct Access to a Global Audience and Hundreds of Premium Sellers. By leveraging our platform, we believe
buyers can reach approximately one billion internet users globally, including through many of the world's largest
and most premium sellers. Furthermore, unlike many organizations in the digital advertising industry, we have
direct relationships with sellers and can enable buyers to circumvent a multi-step, expensive, and inefficient
process to connect to the seller.

Private Marketplaces.  Through our PMP capabilities, we enable buyers to access exclusive high-value inventory
in a more controlled environment than in the open marketplace.

Bid Stream Filtering.  We provide technology to help buyers shape real-time bidding requests, optimize traffic,
and reduce the number of duplicates and irrelevant or undesired bid requests they must process. This helps buyers
find the inventory they are looking for more efficiently and reduces their data processing costs.

Bid Reduction.  Buyers participating in header bidding auctions, which we conduct on a first-price basis, may use
our EMR technology, which uses our market data and proprietary algorithms to help buyers bid on advertising
inventory consistent with market rates.

Flexible Access to Inventory. Our platform allows buyers to purchase advertising inventory in their preferred
manner, whether by OMP or PMP. Our solution also has the flexibility to allow buyers to integrate their purchases
on our platform through their existing buying technologies or to buy directly through our platform.

Simplified Order Management and Campaign Tracking. By eliminating most manual steps, our applications
enable buyers to manage their digital campaigns efficiently and effectively, and significantly reduce the time it
would otherwise take to execute their digital advertising programs.

Transparency and Control Over Advertising Spending. Our platform is designed to let buyers know and control
where their dollars are being spent. Buyers can easily navigate through our interface to choose the list of sellers
they want to purchase inventory from and see an indicative price range that they should expect to pay.

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•

•

Inventory Quality. We provide systems and processes to detect and minimize questionable inventory, such as non-
human traffic and pirated content, and to enable labeling of inventory made available for sale so that buyers can
make their own decisions about what meets the specific standards of campaigns they are running.

PubCheq. We maintain a comprehensive database of all inventory reviewed by internal systems and teams that
powers a global blacklist that blocks fraudulent or otherwise problematic seller properties and users from entering
the Rubicon Project marketplace and identifies non-human traffic that is fraudulently consuming advertising
spend.

Growth Strategies

Two powerful market trends are affecting our business. First, our exchange volume historically consisted largely of OMP  
transactions conducted through an ad server waterfall for desktop display advertising, but this business is being displaced by other 
ad units, channels, and transaction types. Second, the ad tech market is demanding more efficiency and lower cost from 
intermediaries like us, and we believe market share will consolidate. Our strategy for growth in this context is to operate a high-
volume, low cost per transaction exchange, and focus on high-growth ad units, channels and transaction types. 

Increase volumes and efficiencies and reduce transaction costs on our exchange.  We aim to increase our transaction 
volumes and to enhance the operational efficiency and value to clients of our exchange, enabling buyers and sellers to achieve their 
campaign and monetization objectives efficiently and to streamline the number of exchanges they work with. 

•

•

Increasing Inventory Supply.  Increased transaction volume begins with ad requests from sellers, which represent
the inventory available for buyers to purchase on our platform. Our plan for increasing our inventory volumes
includes active pursuit of more direct relationships with sellers, particularly of mobile, video, and PMP
impressions, which are areas of industry growth, and expanding seller tools. Our own header bidding solutions are
an important element of our offering to large sellers. We also access ad requests that might not otherwise be
accessible to us by connecting to third-party header bidding solutions such as Google EB and Amazon A9, as well
as other third-party wrappers, and also integrate through our server-to-server xAPI technology with large sources
of supply that have their own monetization capabilities but also allow third parties to connect to their exchanges
and bid on their inventory.

Elimination of Buyer Fees.  During 2017, we reduced and ultimately eliminated the transaction fees we
previously charged buyers for OMP transactions. As a result, our total take rate was approximately 11.6% as we
exited 2017, which did not include any buyer fees. We believe our pricing is now competitive, and our low fees
are intended to address the market's demand for lower costs and to attract more inventory and spending to our
platform. Elimination of buyer fees also allows us to pass higher bids to the downstream auction in header bidding
transactions, which should improve our fill rate. In addition, elimination of our buyer fees, as well as the auction
dynamics and bid filtering described immediately below, reflect our intensified focus on buyers, which, through
“supply path optimization” initiatives, are expected to concentrate their spending to fewer more efficient sources
of advertising inventory.

• More Competitive Auction Dynamics.  Increased competition inherent in header bidding led other exchanges to
submit bids on a first-price basis, rendering our second-price auction methodology less competitive. Therefore,
effective as of January 22, 2018, we made first-price our default auction dynamic for header bidding transactions,
which has improved the rate at which we win header-bidding auctions. To support buyers that need some time to
adapt their systems and bidding strategies to first-price auction dynamics, or may not wish to make those
adaptations themselves, we provide our EMR feature.

•

•

Bid Filtering.  We continue to improve our fill rate by using the technology we acquired from nToggle to filter out
low-quality impressions so that a higher proportion of the ad requests on our platform are of interest to our buyers,
and to analyze market dynamics to optimize impressions toward our buyers, enabling them to identify and
purchase the impressions they want more efficiently. In addition, we expect the nToggle filtering technology to
help us and our buyers control the processing costs associated with higher volumes of ad requests and bid
requests.

Platform Enhancements.  We are working on a number of platform innovations and enhancements designed to
improve the value to clients and the operational efficiency of our platform. For example, new technology and
techniques will improve upon our market-leading position in inventory and ad quality, responding to market
demands for increased brand security and protection against fraud. Cookie-less targeting, including device-based
user identifiers, will improve audience identification and match rates. Audience-based selling and enhanced
measurement and viewability technologies will improve inventory values for sellers and campaign effectiveness

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for buyers. Impression filtering and virtual machine support will improve the efficiency and effective capacity of 
our data processing infrastructure.

Focus on emerging ad units, channels, and transaction types

Our business historically consisted largely of OMP transactions conducted through an ad server waterfall for desktop display 
advertising, which has declined significantly. In order for us to grow and compete effectively, we must continue to focus on areas of 
the digital advertising business that are experiencing growth and to adapt to evolution in the business. 

• Mobile. We believe we can significantly expand the penetration of our mobile offerings among buyer and seller
clients by creating and introducing new mobile ad formats, growing mobile advertising by brands with better
measurement and decisioning data, and leveraging header bidding to improve returns for developers. Mobile
includes mobile web pages as well as mobile applications.

•

Audiences. We aim to develop technology to enable buyers and sellers to safely leverage their first-party data
assets and third-party data assets in our platform to increase the value of sellers' inventory and the precision of
buyers' targeting efforts, and to drive more precise matching of buyer demand to seller inventory. As the world
continues to move more toward an app-centric consumption of the Internet, our concept of identity is evolving
away from the browser cookie and into more sophisticated ID-agnostic systems and technology.

• Header Bidding. We will invest in continued improvement in our header bidding capabilities, including through
support of open-source wrapper technologies that eliminate exchange bias, expand support for major third-party
header bidding technologies and additional formats to maximize access to inventory supply, and develop enhanced
customer service capabilities.

•

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•

Private Marketplace. We will continue to invest in our PMP solution, which we believe is well-positioned to take
advantage of increased industry demand for PMP transactions.

Video. We plan to expand our video presence by continuing to drive growth with header bidding, new formats and
stronger measurement and targeting capabilities, and providing monetization service for over-the-top ("OTT") and
connected television content providers as they migrate increasingly to programmatic monetization of their
advertising inventory.

Bringing Automation to Additional Media. Historically, our solution has focused on display advertising. We
believe, however, that television and other analog and print media will eventually converge with existing digital
channels, creating opportunities for us to expand our solution beyond digital media to analog and print media,
such as television, radio, and magazines, as well as further expand in out-of-home media like billboards. We
intend to extend our solution to track this convergence and support increasingly complex volumes of
advertisements spanning multiple media. In addition to platform expansion, we intend to extend beyond our
current capabilities for display, video, and engagement to other forms of advertising units as they may arise.

Technology and Development

To support our solution, we have developed globally distributed infrastructure hosted at data centers in the U.S., Europe, 

and Asia that run our proprietary software and process privacy-enabled user data, including analytics and decision-making 
algorithms, and store, manage, and process rules set by buyers and sellers and data about demographics, economics, timing, and 
preferences. Our hardware provides significant scale and is programmed for high-frequency, low-latency transactions. Its massive 
scale supports the volume, diversity, and complexity of buyers’ bids on sellers’ advertising inventory to increase market liquidity, 
and it achieves improved auction pricing using our machine-learning algorithms. This infrastructure is supported by a real-time data 
pipeline, a system that quickly moves volumes of data generated by our business into reporting and machine learning systems that 
allow usage both internally and by buyers and sellers. It also is supported by a 24-hour Network Operations Center, which provides 
failure protection by monitoring and rerouting traffic in the event of equipment failure or network performance issues between 
buyers and our marketplace.

Auction and security algorithms use matchmaking algorithms with both historical and real-time data to drive automated 
decision-making processes. Bid efficiency algorithms provide bid prediction (i.e., which buyers are most likely to bid on a given 
impression) and throttling (i.e., the volume of bid requests a given buyer can process), to improve infrastructure load and execute 
transactions in the most timely manner possible by only sending bid requests to those buyers of advertising inventory who can 
handle the volume and are likely to respond. 

Our core technology and development team is responsible for the design, development, operation, and maintenance of our 

platform. Our technology and development process is based on agile development methodologies and emphasizes frequent, 
iterative, and incremental development cycles. Within the technology and development team, we have several highly aligned, 

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independent sub-teams that focus on particular features of our platform. Each of these sub-teams includes engineers, quality 
assurance specialists, and product developers responsible for the initial and ongoing development of each sub-team’s feature. In 
addition, the technology and development team includes our technical operations sub-team, which is responsible for the 
performance and capacity of our platform. While our sub-teams operate independently, the combined work is coordinated by our 
project management team, which manages dependencies and optimizes the schedule of the entire team towards common goals.

We believe that continued investment in our platform, including its technologies and functionalities, is critical to our 

success and long-term growth. We therefore expect technology and development expenses to increase as we continue to invest in 
technology infrastructure to support an increased volume of advertising spending on our platform and international expansion, 
migrate some of our infrastructure to the cloud, and expand our engineering and technology teams to maintain and support our 
technology and development efforts. We also intend to invest in new and enhanced technologies and functionalities to enhance our 
platform and further automate our business processes with the goal of enhancing our future profitability.

Sales and Marketing

We market our solution to buyers and sellers through global direct sales teams that operate from various locations around 

the world. These teams leverage market knowledge and expertise to demonstrate the benefits of advertising automation and our 
solution to buyers and sellers. We deploy a professional services team with each seller integration to assist sellers in extracting value 
from our solution. Our buyer team focuses on the unique challenges and priorities of buyers and is separately managed in order to 
properly represent this important client group. We are focused on managing our brand, increasing market awareness, and driving 
advertising spend to our platform. To do so, we often present at industry conferences, create custom events, and invest in public 
relations. In addition, our marketing team advertises online, in print, and in other forms of media, creates case studies, sponsors 
research, writes whitepapers, publishes marketing collateral, generates blog posts, and undertakes client research studies.

Competition

Our industry is highly competitive. Overall digital advertising spending is highly concentrated in a small number of very 

large companies that have their own inventory, including Google and Facebook, and increasingly Amazon, with which we compete 
for digital advertising inventory and demand. These companies are formidable competitors due to their huge resources and direct 
user relationships. Despite the dominance of large companies, there is still a large addressable market that is highly fragmented and 
includes many providers of transaction services with which we compete, including supply side platforms, or SSPs, and advertising 
exchanges. As we introduce new offerings, as our existing offerings evolve, or as other companies introduce new products and 
services, we may be subject to additional competition. There has been rapid evolution and consolidation in the advertising 
technology industry, and we expect these trends to continue, thereby increasing the capabilities and competitive posture of larger 
companies, particularly those that are already dominant in various ways, and enabling new or stronger competitors to emerge. There 
are many ways for buyers and sellers of digital advertising inventory to connect and transact, including directly and through many 
other exchanges, and advertising inventory buyers are increasingly demanding more transparency and lower transaction costs and 
establishing relationships directly with sellers of advertising inventory, which puts significant pressure on us. Our offering must 
remain competitive in terms of scope, ease of use, scalability, speed, price, inventory quality, brand security, customer service, and 
other technological features that help sellers monetize their inventory and buyers increase the return on their advertising investment. 

While our industry is evolving rapidly and becoming increasingly competitive, we believe that our solution enables us to 

compete favorably on the factors described above. However, competitive differentiation is difficult to achieve, both in terms of 
capabilities and in terms of client perception. We lack the scale of some of our competitors, which may have the ability to compete 
effectively with us by offering broader capabilities or more aggressive pricing. Other competitors with capabilities inferior to ours 
may nevertheless compete effectively with us if clients do not perceive, or value, what we believe to be our competitive advantages. 

To an increasing degree, SSPs and exchanges are becoming somewhat similar and less distinguishable in the services that 
they provide, and with the proliferation of header bidding, which increased competition for impressions, pricing has become a key 
competitive factor. In 2017, we continued to see a heightened level of competition on pricing sensitivity, which led us to implement 
buyer fee reductions in the first half of the year and ultimately to eliminate all our buy side transaction fees on November 1, 2017. 

Overall our revenue decreased 20% from $155.5 million in 2017 to $124.7 million in 2018, which reflects the impact of 

our buyer fee elimination, partially offset by growth in ad spend. Our overall take rate in 2018 declined to 12.6% compared to 
18.5% in 2017 and 25.0% in 2016. We exited 2018 at approximately 13.6% compared to 11.6% at the end of 2017. Our exit take 
rate in December 2018 is higher due primarily to seller pricing improvements negotiated during the year. We believe this take rate 
puts us in a favorable competitive position in terms of pricing, but it is uncertain whether it represents a sustainable competitive 
advantage or if we can increase our transaction volume enough to compensate for lower prices. 

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Our Team and Culture

Our team draws from a broad spectrum of experience, including data science, machine-learning algorithms, auctions, 

infrastructure, software development, and from experienced managers on the seller and buyer sides.

We focus heavily upon developing and maintaining a company culture that supports our goals. We strive to make our 
company an exciting place to work, not just a “job.” We reward team and individual excellence and constantly strive to build a 
stronger, more innovative team and a consistent culture across all our locations.

As of December 31, 2018, we had 409 full-time employees. In addition to the United States, we have personnel and 

operations in England, Canada, France, Australia, Germany, Italy, Japan, Singapore, and Brazil. 

Our Intellectual Property

Our proprietary technologies are important and we rely upon trade secret, trademark, copyright, and patent laws in the 

United States and abroad to establish and protect our intellectual property and protect our proprietary technologies.

We have several issued patents and pending patent applications, some of which may ultimately be abandoned if we 

determine that the cost of prosecution or maintenance does not justify the utility of receiving the patent. None of these patents has 
been litigated and we are not licensing any of the patents, and we do not believe that any individual patent or patent application is 
material to our business. Their importance to our business is uncertain and there are no guarantees that any of the patents will serve 
as protection for our technology or market in the United States or any other country in which an application has been filed. 

We register certain domain names, trademarks and service marks in the United States and in certain locations outside the 

United States. We also rely upon common law protection for certain trademarks. We generally enter into confidentiality and 
invention assignment agreements with our employees and contractors, and confidentiality agreements with parties with whom we 
conduct business, in order to limit access to, and disclosure and use of, our proprietary information. We also use measures designed 
to control access to our technology and proprietary information. We view our trade secrets and know-how as a significant 
component of our intellectual property assets, which we believe differentiate us from our competitors.

Any impairment of our intellectual property rights, or any unauthorized disclosure or use of our intellectual property or 

technology, could harm our business, our ability to compete and our operating results.

Client Dynamics

While we serve many clients, certain buyers and sellers account for a large share of business transacted through our 

platform.

On the buy-side of our business, while demand for advertising inventory is diffuse, spending by advertisers on digital 

advertising inventory has historically been channeled through intermediaries, including principally advertising agencies and DSPs, 
both of which are important to us. We have generated a majority of our revenue through OMP, and most OMP inventory purchases 
are executed by a relatively small number of DSPs that have the bidding technologies, data assets, and client bases necessary to 
enable them to execute OMP purchases at scale on behalf of their clients. We have relationships with almost all of these major 
DSPs, but because there are relatively few of them, each of these relationships is important to us because it represents a source of 
demand that could be difficult for us to replace. Similarly, the majority of supply to date on our PMP product has been by a 
relatively small number of sellers. Creating new seller clients and expanding our business with existing seller clients is important to 
our growth, and the loss of any seller clients could adversely affect our PMP business. In addition, because large agencies often 
spend through multiple DSPs, new or enhanced agency relationships can result in increased spending on our platform by multiple 
DSPs, while a decrease in business or a decline in our relationship with a single agency can result in reduced spending by multiple 
DSPs. We are working to develop relationships directly with advertisers, to supplement their DSP and agency relationships and also 
to encourage them to influence their DSPs and agencies to route their spending through our platform. 

On the sell-side of our business, while we work with many clients, a relatively small number of them provide a large share 

of the unique user audiences accessible by buyers. In addition, most of the application providers that make inventory available 
through our platform utilize system development kits ("SDKs") and other proprietary technology of third parties, such as 
aggregators, and it is those third parties, not the application providers themselves, that contract with us to help monetize the 
inventory. Termination or diminution of our relationships with these third parties could result in a material reduction of the amount 
of mobile inventory available through our platform. We encourage application developers to use our own SDK when appropriate, 
but it is difficult to displace existing SDKs.  

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Our contracts with buyers and sellers generally do not provide for any minimum volumes and may be terminated on 
relatively short notice. Buyer and seller needs and plans can change quickly, and buyers and sellers are free to terminate their 
arrangements with us or direct their spending and inventory to competing sources of inventory and demand, quickly and without 
penalty. Loss of a major buyer could result in a decrease of demand on our platform, and loss of a major seller could result in 
decrease of inventory available on our platform. Despite such losses, there could still be adequate demand and inventory supply on 
our platform to sustain and grow our revenue, so it is not necessarily the case that loss of a buyer or seller equates to loss of revenue. 
However, loss of unique inventory and loss of any demand could result directly in revenue loss. In addition, just as growth in the 
inventory strengthens buyer activity in a network effect, loss of substantial inventory or demand could degrade our marketplace. 
Loss of major DSP sources of demand could adversely affect bid density or pricing in our RTB auctions, and reduction in fees if we 
are not able to redirect inventory to other demand sources. Loss of important unique inventory could reduce fees from demand that 
cannot be shifted to other sellers. The number of large media buyers and sellers in the market is finite, and it could be difficult for us 
to replace the losses from any buyers or sellers whose relationships with us diminish or terminate.

Because of these factors, we seek to expand and diversify our client relationships. In particular, as part of our strategy to 
increase the volume of advertising inventory on our exchange, we are continuing relationships with aggregators of inventory and 
with large sources of supply that have their own monetization capabilities but also allow third parties to connect to their exchanges 
and bid on their inventory. These relationships represent additional risks in terms of inventory quality, transaction discrepancies, and 
collections, and may be less profitable because we may be required to compensate these partners or share the fees available for 
intermediaries in these transactions, and may incur higher serving costs relative to revenue.  

Geographic Scope of Our Operations

Our international operations and expansion plans expose us to various risks. International operations require significant 
investment in developing the technology infrastructure necessary to deliver our solution and establishing sales, delivery, support, 
and administrative capabilities in the countries where we operate. We face staffing challenges, including difficulty in recruiting, 
retaining, and managing a diverse and distributed workforce across time zones, cultures, and languages. We must also adapt our 
practices to satisfy local requirements and standards (including differing privacy requirements that are sometimes more stringent 
than in the U.S.), and manage the effects of global and regional recessions and economic and political instability. Transactions 
denominated in various non-U.S. currencies expose us to potentially unfavorable changes in exchange rates and added transaction 
costs. Foreign operations expose us to potentially adverse tax consequences in the United States and abroad and costs and 
restrictions affecting the repatriation of funds to the United States. For detailed information regarding our revenue and property and 
equipment, net by geographical region, see Note 4 and Note 7 of the "Notes to Consolidated Financial Statements."

User Reach 

It is not practicable to determine the exact number of unique users we reach because we do not collect personally 
identifiable information. In order to estimate our user reach, we start with data we track on devices we see through our platform in a 
given time period: for web browsers, we identify each combination of browser user agent and originating IP address, and for mobile 
application users, we identify unique device identifiers. The resulting aggregated total counts some devices more than once because 
the same device creates different user agent and IP address combinations by using different browsers to access the Internet and/or 
accessing the Internet from locations with different IP addresses. We therefore make assumptions about the amount of duplication, 
as well as assumptions about the average numbers of devices per person, which can vary by geography and over time, and apply 
these assumptions to estimate of the number of users we reach. Following this methodology, we estimate that we reach 
approximately one billion users globally through our platform. This figure depends upon our assumptions and is therefore inherently 
imprecise and may differ from third-party estimates of our reach.

Regulation

Behavioral or personalized advertising, or the use of data to draw inferences about a user’s interests and deliver relevant 

advertising to that user, has come under increasing scrutiny by legislative, regulatory, and self-regulatory bodies in the United States 
and abroad that focus on consumer protection or data privacy. In particular, this scrutiny has focused on the use of technology 
(including "cookies") to collect or aggregate information about Internet users’ online browsing activity. Because we, and our clients, 
rely upon large volumes of such data, it is essential that we monitor developments in this area domestically and globally, and engage 
in responsible privacy practices, including providing consumers with notice of the types of data we collect and how we use that data 
to provide our services.

We provide this notice through our privacy policy, which can be found on our website at http://www.rubiconproject.com/

privacy. As stated in our privacy policy, our technology platform does not collect information, such as name, address, or phone 
number, that can be used directly to identify a real person, and we take steps not to collect and store such information from any 
source. Instead, we rely on IP addresses, geo-location information, and persistent identifiers about Internet users and do not attempt 

16

 
to associate this data with other data that can be used to identify real people. This type of information is considered personal data in 
some jurisdictions or otherwise may be the subject of future legislation or regulation. The definition of personal data varies by 
country, and continues to evolve in ways that may require us to adapt our practices to avoid violating laws or regulations related to 
the collection, storage, and use of consumer data. As a result, our technology platform and business practices must be assessed 
regularly in each country in which we do business.

There are also a number of specific laws and regulations governing the collection and use of certain types of consumer data 

relevant to our business. For example, the Children’s Online Privacy Protection Act ("COPPA"), imposes restrictions on the 
collection and use of data about users of child-directed websites. To comply with COPPA, we have taken various steps to implement 
a system that: (i) flags seller-identified child-directed sites to buyers, (ii) limits advertisers’ ability to serve personalized 
advertisements on child-directed sites, (iii) helps limit the types of information that our advertisers have access to when placing 
advertisements on child-directed sites, and (iv) limits the data that we collect and use on such child-directed sites.

The use of and transfer of personal data in EU member states is currently governed by the General Data Protection 

Regulation (the "GDPR"). The GDPR sets out higher potential liabilities for certain data protection violations, as well as a greater 
compliance burden for us in the course of delivering our solution in Europe. Among other requirements, the GDPR obligates 
companies that process large amounts of personal data about EU residents to implement a number of formal processes and policies 
for reviewing and documenting the privacy implications of the development, acquisition, or use of all new products, technologies, or 
types of data. Further, the European Union is expected to replace the EU ePrivacy Directive governing the use of technologies to 
collect consumer information with the ePrivacy Regulation. Current drafts of the ePrivacy Regulation propose burdensome 
requirements around obtaining consent, and impose fines for violations that are materially higher than those imposed under the 
ePrivacy Directive.

The GDPR also prohibits the transfer of personal data of EU subjects outside of the European Economic Area ("EEA"), 
unless the party exporting the data from the EU implements a compliance mechanism designed to ensure that the receiving party 
will adequately protect such data. We have relied on certain compliance measures that are currently subject to legal challenge, and 
which directly subject us to regulatory enforcement by data protection authorities located in the European Union and the United 
States. By relying on these compliance measures, we risk becoming the subject of regulatory investigations in any of the individual 
jurisdictions in which we operate. Each such investigation could cost us significant time and resources, and could potentially result 
in fines, criminal prosecution, or other penalties. Further, to the extent any of the legal challenges to these compliance measures are 
successful, this could invalidate our approach to data export from the EEA. It may take us significant time, resources, and effort to 
restructure our business and/or rely on another legally sufficient compliance measure. 

The UK's decision to leave the European Union may add cost and complexity to our compliance efforts. The UK is an 

important geography for us. If UK and EU privacy and data protection laws and regulations diverge, we will be required to 
implement alternative EU compliance measures and adapt separately to any new UK requirements.

Additionally, our compliance with our privacy policies and our general consumer privacy practices are also subject to 

review by the Federal Trade Commission, which may bring enforcement actions to challenge allegedly unfair and deceptive trade 
practices, including the violation of privacy policies and representations therein. Certain State Attorneys General may also bring 
enforcement actions based on comparable state laws or federal laws that permit state-level enforcement. Outside of the 
United States, our privacy and data practices are subject to regulation by data protection authorities and other regulators in the 
countries in which we do business.

Beyond laws and regulations, we are also members of self-regulatory bodies that impose additional requirements related to 

the collection, use, and disclosure of consumer data, including the Internet Advertising Bureau ("IAB"), the Digital Advertising 
Alliance, the Network Advertising Initiative, and the Europe Interactive Digital Advertising Alliance. Under the requirements of 
these self-regulatory bodies, in addition to other compliance obligations, we provide consumers with notice via our privacy policy 
about our use of cookies and other technologies to collect consumer data, and of our collection and use of consumer data to deliver 
personalized advertisements. We also allow consumers to opt-out from the use of data we collect for purposes of behavioral 
advertising through a mechanism on our website, linked through our privacy policy as well as through portals maintained by some 
of these self-regulatory bodies. Some of these self-regulatory bodies have the ability to discipline members or participants, which 
could result in fines, penalties, and/or public censure (which could in turn cause reputational harm). Additionally, some of these self-
regulatory bodies might refer violations of their requirements to the Federal Trade Commission or other regulatory bodies.

Business Seasonality

Our advertising spend, revenue, cash flow from operations, Adjusted EBITDA, operating results, and other key operating 
and financial measures may vary from quarter to quarter due to the seasonal nature of buyer spending. For example, many buyers 
devote a disproportionate amount of their advertising budgets to the fourth quarter of the calendar year to coincide with increased 

17

holiday purchasing. We expect our revenue, cash flow, operating results and other key operating and financial measures to fluctuate 
based on seasonal factors from period to period and expect these measures to be higher in the fourth quarters than in prior quarters.

Working Capital Requirements

  Our revenue is generated from advertising spend transacted on our platform using our technology solution. Generally, we 

invoice and collect from buyers the full purchase price for impressions they have purchased, retain our fees, and remit the balance to 
sellers. We attempt to coordinate collections from our buyers so as to fund our payment obligations to our sellers. However, in some 
cases, we may be required to pay sellers for impressions delivered before we have collected, or even if we are unable to collect, 
from the buyer of those impressions. There can be no assurances that we will not experience bad debt in the future. Any such write-
offs for bad debt could have a materially negative effect on our results of operations for the periods in which the write-offs occur. In 
addition, growth and increased competitive pressure in the digital advertising industry are causing brand spenders to become more 
demanding, resulting in overall increased focus by all industry participants on pricing, transparency, and cash and collection cycles. 
Some buyers have experienced financial pressures that have motivated them to challenge some details of our invoices or to slow the 
timing of their payments to us. If buyers slow their payments to us or our cash collections are significantly diminished as a result of 
these dynamics, our revenue and/or cash flow could be adversely affected and we may need to use working capital to fund our 
accounts payable pending collection from buyers. This may result in additional cash expenditures and cause us to forgo or defer 
other more productive uses of that working capital.

Available Information

The Company is subject to the reporting requirements of the Securities Exchange Act of 1934, as amended, or the 
Exchange Act, and accordingly files Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-
K, proxy statements, and related amendments and other information with the Securities and Exchange Commission, or the SEC, 
pursuant to Sections 13(a) and 15(d) of the Exchange Act. Information filed by the Company with the SEC is available free of 
charge on the Company’s website at investor.rubiconproject.com as soon as reasonably practicable after such materials are filed 
with or furnished to the SEC. The public may read and copy any materials filed by the Company with the SEC at the SEC’s Public 
Reference Room at 100 F Street, NE, Washington, DC 20549 on official business days during the hours of 10:00 am to 3:00 pm. 
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. The contents of these websites are not incorporated into this Annual Report on Form 
10-K or into any other report or document we file with the SEC, and any references to the URLs for these websites are intended to
be inactive textual references only.

Item 1A. Risk Factors

  Investing in our common stock involves a high degree of risk, including the risks described below, each of which may be 

relevant to decisions regarding an investment in or ownership of our stock. The occurrence of any of these risks could have a 
significant adverse effect on our reputation, business, financial condition, revenue, results of operations, growth, or ability to 
accomplish our strategic objectives, and could cause the trading price of our common stock to decline. You should carefully 
consider the risks set forth below and the other information contained in this report, including our consolidated financial statements 
and related notes and Management's Discussion and Analysis of Financial Condition and Results of Operations, before making 
investment decisions related to our common stock. However, this report cannot anticipate and fully address all possible risks of 
investing in our common stock, the risks of investing in our common stock may change over time, and additional risks and 
uncertainties that we are not aware of, or that we do not consider to be material, may emerge. Accordingly, you are advised to 
consider additional sources of information and exercise your own judgment in addition to the information we provide.

Risks Relating to Our Business, Growth Prospects and Operating Results

We made a strategic decision to reduce our pricing by lowering and then eliminating our buyer fees in 2017, resulting in 
significant revenue declines. We are now pursuing a higher volume, lower cost business model, which involves risks and may not 
succeed.

The ad tech market is demanding more efficiency and lower cost from intermediaries like us. In an effort to be more 
competitive in attracting demand and capturing inventory supply, we made a strategic decision in mid-2017 to reduce the fees we 
charged buyers in open market RTB transactions. In addition, in 2017 our business mix shifted to a higher proportion of header 
bidding transactions, and we charged lower buyer fees for header bidding transactions in order to pass higher bids to the 
downstream decisioning process. Finally, in response to increasing market pressure and in an effort to be more competitive, on 
November 1, 2017 we eliminated our buyer transaction fees altogether. 

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Buyer transaction fees represented approximately 49% of our revenue for the first ten months of 2017, which is the period 

during which we charged buyer fees in 2017, and represented approximately 43% of our revenue in 2017. Consequently, the 
elimination of our buyer transaction fees has had a severe adverse effect on our revenue and margins. We must continue to increase 
transactional activity on our platform dramatically to make up for this lost revenue and maintain growth. A critical part of our plan 
to adjust to our lower take rates is to increase advertising spending on our platform and operate with improved efficiency that will 
support lower margins. To increase our advertising spend, we are taking steps to increase significantly the ad requests coming from 
our seller clients, which represent inventory available for purchase on our platform, and to increase the percentage of ad requests 
that we convert into successful transactions (fill rate). We have seen success in growing our share of ad requests, but with additional 
ad requests comes increased serving costs, lower fill rates, and potentially lower inventory quality. Our plans for increasing our 
inventory volumes include active pursuit of more direct relationships with sellers, particularly of mobile, video, and PMP 
impressions, which are areas of industry growth. We also plan to access ad requests that might not otherwise be accessible to us by 
utilizing emerging header bidding technologies, including third-party wrappers, and also integrating with large sources of supply 
that have their own monetization capabilities but also allow third parties to connect to their exchanges and bid on their inventory. 
We continue to use the technology we acquired from nToggle to improve our fill rate by filtering out low-quality impressions so a 
higher proportion of the ad requests on our platform are of interest to our buyers. In addition, the nToggle filtering technology is 
helping us and our buyers control the processing costs associated with the growing volume of ad requests. These efforts require us 
to expend a significant amount of time and resources and may ultimately prove to be ineffective and it may be possible that we are 
filtering traffic that would otherwise be monetizable.    

We may not succeed in continuing to increase the inventory on our platform or improving fill rates for various reasons. 

Competitors could match our price reductions and develop their own filtering capabilities, thereby reducing the competitive 
advantage we seek to develop. Sellers could decide to reduce the number of exchanges with which they integrate and choose 
competitors over us. Large sources of supply that have their own monetization capabilities and also allow us to connect to their 
exchanges and bid on their inventory could reduce or eliminate our access to their inventories. Providers of third-party header 
bidding solutions could impose prohibitive terms. Much of our inventory growth has been through header bidding or other 
downstream decisioning arrangements; we must compete effectively with other sources of demand to purchase that inventory, which 
may be difficult if competitors have more robust demand or more effective technology or offer better pricing or service. In addition, 
operating at higher volumes with lower margins requires scale and efficiency, and we could have difficulty competing successfully 
with our largest competitors if the market evolves to aggressive price-cutting. If we are unable to compensate for our price 
reductions by continuing to increase advertising spend on our platform, our revenue will decline, we will not be able to grow our 
business, our cash resources may be depleted, and we may be forced to seek additional capital to support our business and 
operations.   

While we work to increase the volume of transactions on our exchange, we must operate more cost-effectively to relieve the 

pressure on our margins and cash resources that has resulted from our price reductions. We must achieve overall cost controls 
despite the additional investments in technology and data processing capabilities required to support the increased volume of 
transactions on our exchange that our growth plans require. Therefore, in addition to the pursuit of our growth strategies, we are 
pursuing various cost-control measures. We are undertaking efficiency initiatives including increased automation, bid filtering, 
office consolidation, reduction in general and administrative expenses, and other measures, all of which involve operational 
tradeoffs and involve risk, including increased risk of administrative error due to reduced staffing levels. If we are not able to 
improve the efficiency of our operations and succeed with our growth strategies, our business may not be viable. If we are required 
to cut costs further in order to remain competitive, we may have difficult identifying and implementing significant additional cost 
reduction measures without adversely impacting our operations and our ability to provide competitive services to our clients. 

We must grow rapidly to remain a market leader and to accomplish our strategic objectives. In order to meet our growth 
objectives, we will need to rely upon our ability to innovate, the continued adoption of our solution by buyers and sellers for 
higher value advertising inventory, the extension of our solution into evolving digital media, continued growth into new 
geographic markets, shift of our business mix to emphasize higher growth channels and ad units, and the implementation of new 
offerings. If we fail to grow, the value of our company may decline.

We must continue growing to keep pace with the growth and change in our market and to compete effectively. Growth 
depends upon the quality of our strategic vision and planning and our ability to compete effectively and meet the evolving needs of 
our clients. The advertising market is evolving rapidly, and if we make strategic errors, there is a significant risk that we will be 
unable to recover and achieve our objectives. 

Historically, real-time bidding, or RTB, open-market transactions, particularly for desktop display advertising, have provided 
most of the activity on our platform. We expect our historical open-market RTB desktop display advertising business to continue to 
be an important source of revenue for us, but consistent with market trends, our RTB desktop display business has declined 
significantly as other transaction types and channels have absorbed a greater share of advertising spend. In addition, our share of the 
RTB desktop display market has diminished, largely because header bidding has allowed more parties to compete for this inventory. 

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Accordingly, our RTB desktop display business cannot be relied upon to drive growth. In order for us to grow and compete 
effectively, we must continue to increase our business in other transaction types, such as PMP transactions, other channels, such as 
mobile, and other advertising formats, all of which are growth areas in the market, innovate to adapt to changing market conditions, 
further increase our international business in existing and new markets, and significantly expand the use of our PMP offerings. 
Mobile, video, and other emerging digital platforms require different technology and business expertise than display advertising, 
and also present other challenges that may be difficult for us to overcome, including inventory quality issues. Many of our 
competitors in these emerging platforms have a significant head start in terms of technology, buyer or seller relationships, and the 
scope of their product offerings. Furthermore, a growing percentage of online and mobile advertising spending is captured by owned 
and operated sites (such as Facebook and Google). Our business model may not translate well into higher-value advertising due to 
market resistance or other factors, and we may not be able to innovate quickly or successfully enough to compete effectively on new 
platforms, or to adapt our solution and infrastructure to international markets. 

Our technology development efforts may be inefficient or ineffective, which may impair our ability to attract buyers and sellers.

We face intense competition in the marketplace and are confronted by rapidly changing technology, evolving industry 
standards and consumer needs, regulatory changes, and the frequent introduction of new solutions by our competitors that we must 
adapt and respond to. Our future success will depend in part upon our ability to enhance our existing solution and to develop and 
introduce competing new solutions in a timely manner with features and pricing that meet changing client and market requirements. 
Our solutions are complex and can require a significant investment of time and resources to develop, test, introduce, and enhance. 
These activities can take longer than we expect. We schedule and prioritize our development efforts according to a variety of factors, 
including our perceptions of market trends, client requirements, and resource availability; we may encounter unanticipated 
difficulties that require us to re-direct, scale back, or modify our efforts. If development of our solution becomes significantly more 
expensive due to changes in regulatory requirements or industry practices, or other factors, we may find ourselves at a disadvantage 
to larger competitors with more resources to devote to development. These factors place significant demands upon our engineering 
organization, require complex planning, and can result in acceleration of some initiatives and delay of others. We have expanded our 
use of outsourced software development, which may put the company at greater risk with respect to our technology development 
because we may have less control over the performance of outside programmers and we may be at greater risk of losing their 
services. If we do not manage our development efforts efficiently and effectively, we may fail to produce solutions that respond 
appropriately to the needs of buyers and sellers, and competitors may more successfully develop responsive offerings. If our 
solution is competitive, buyers and sellers can be expected to shift their business to competing solutions. Buyers and sellers may 
also resist adopting our new solutions for various reasons, including reluctance to disrupt existing relationships and business 
practices or to invest in necessary technological integration.

The emergence of header bidding may reduce the value of inventory available to us from sellers, and our header bidding 
solution may not result in revenue growth and may cause infrastructure strain and added cost. 

Sellers have embraced header bidding, a technology solution by which impressions that would have previously been exposed 

to different potential sources of demand in a sequence dictated by ad server priorities are instead available for concurrent 
competitive bidding by demand sources. This can help sellers increase revenue by exposing their inventory to more bidders, thereby 
allocating more inventory to demand sources that value it most highly. However, the number of demand sources that sellers accept 
is limited because too many header bidding integrations can cause delays in the transaction execution process, and therefore we 
must compete with other demand sources for allocations within a sellers' header bidding solution. With sellers that integrate with us 
as a demand source within their header bidding solution, we may be able to participate in improved demand dynamics by competing 
for impressions that would previously have been allocated first to demand sources prioritized above us in the seller's ad server, with 
accompanying potential for improved revenue. However, some sellers may not choose to do so, and our opportunities with those 
sellers may be impaired as a result. Certain sources of demand with unique value propositions may be prioritized by sellers in their 
header bidding implementation, leaving us to compete with other competitors for the remainder. Further, header bidding allows 
smaller competitors with less demand and/or fewer established seller relationships to compete for higher-value impressions on a 
more even footing. Just as header bidding allows us to compete with demand sources that would previously have been above us in 
sellers' ad server sequences, it exposes us to additional competition by demand sources that, prior to the emergence of header 
bidding, might have been below us in the sellers' ad server sequences or otherwise unable to compete effectively for inventory. This 
has contributed to our loss of market share for RTB desktop display inventory.

We have increased the number of installations of our header bidding solution with sellers. However, the productivity of our 

implementations to date has varied among sellers as a result of factors over which we have limited control, including seller systems 
and capabilities, technical proficiency of seller implementations, and third-party code that sellers load onto their pages. As a result, 
many implementations require individualized adaptation and troubleshooting. Because header bidding has typically relied upon the 
consumer’s browser for execution, header bidding auctions can fail if the consumer’s browser is not updated or if the consumer’s 
internet connection is slow, and header bidding can cause increased load times for content, adversely affecting user experience. 
Mobile browsers present additional difficulties. One alternative is to migrate functionality away from the client-side to the server-

20

side, which is more highly controlled and should support faster load times. We are pursuing server-side solutions, but they present 
their own challenges. Adding an additional step between the user’s browser and the demand source can cause increased latency and 
limit the amount of user data that is transmitted, contributing to difficulties in user data syncing and resulting adverse effects on 
audience targeting. Server-side technology also significantly increases the volume of demand sources that can be accommodated, 
resulting in increased competition for impressions. Further, the exchange hosting the server-side technology used in a particular 
transaction has an advantage in user sync with its demand sources, at least until some form of universal user identification approach 
gains significant market adoption. In the future, we plan to host more server-side header bidding solutions for our sellers, but this 
will increase our infrastructure costs, which we will not recover without increasing our fill rates. 

As we invest in development of next-generation header bidding technology, we must continue working to improve the 
efficiency and effectiveness of our current header bidding solution and installations. Until we address these transitional issues, we 
will not fully offset the increased infrastructure costs associated with the higher volume of ad and bid requests we process as a result 
of header bidding; and we will not be able to take full advantage of the opportunities made available through current header bidding 
technology to access a larger addressable market and increase our revenue by capturing a greater share of higher value inventory. In 
addition, the expansion of header bidding exposes more inventory to competitive bidding, thereby potentially resulting in increased 
volatility of our operating results with little warning as a result of various factors, including evolution in technology and changes in 
business practices such as competitors’ bidding tactics and sellers’ ad server integration and management.

We must increase the scale and efficiency of our technology infrastructure to support our growth and transaction volumes. 

Our technology must scale to process the increased ad requests on our platform. Additionally, for each individual advertising 
impression created when a user visits a website or uses an application where our auctions technology is integrated, our technology 
must send bid requests to appropriate buyers, receive and process their responses, select a winner, and, increasingly, integrate with 
downstream decisioning systems. It must perform these transactions end-to-end within milliseconds. We must continue to increase 
the capacity of our platform to support our high-volume strategy, to cope with increased data volumes and parties resulting from 
header bidding, and an increasing variety of advertising formats and platforms, and to maintain a stable service infrastructure and 
reliable service delivery. Delivering this increased capacity while concurrently reducing organizational costs to help compensate for 
our reduced revenue base will require us to implement more efficient data processing and traffic filtering. If we are unable, for cost 
or other reasons, to effectively increase the capacity of our platform, continue to process transactions at fast enough speeds, and 
support emerging advertising formats or services preferred by buyers, our revenue may be adversely affected by the inability to 
obtain new buyers or sellers, loss of existing buyers or sellers, or failure to process auction transactions in a timely manner. We 
expect to continue to invest in our platform to meet increasing demand. Such investment may negatively affect our profitability and 
results of operations, or cause dilution to our stockholders.

Our belief that there is significant and growing demand for private marketplace solutions may be inaccurate, and we may not 
realize a return from our investments in that area.

We believe there is significant and growing demand for PMPs, and we have made significant investments to meet that 
demand and grow our market share of PMPs. PMPs may involve lower fees than we can charge for our real-time bidding services, 
which may not be fully offset by anticipated higher CPMs. In some cases, we have experienced fee pressure as we have built out our 
PMP offering, and we expect this fee pressure to increase as more competitors, including new entrants as well as sellers themselves, 
build their own technology and infrastructure to enter this business. Even if the market for these solutions develops as we anticipate, 
buyers and sellers might not embrace our offerings to the degree we expect due to various factors. For example, we may not be 
successful in building out these offerings consistent with our vision, or competitive offerings may be offered at lower prices or be 
perceived as having better features and functionality. We may also be unable to scale our solution to markets outside of the United 
States due to local currency or other specific regulatory or operational requirements that we are unable to comply with. Even if the 
market for these solutions develops as we anticipate, and our buyers and sellers embrace our offerings, the positive effect of our 
PMP offerings on our results of operations may be offset or negated if PMPs cannibalize our open marketplace transaction volumes,  
by similar offerings from our competitors, or other adverse developments.

Our expectations regarding the growth prospects of our buyer offerings may be incorrect, and we may not realize a return from 
our investments in that area.

We compete for demand with well-established companies that have technological advantages stemming from their experience 

in the market. We must continue to adapt and improve our demand technology to compete effectively, and buyers may not embrace 
our offering due to various factors, including the perception that competitors have superior technology or produce better results. 
Buyers’ efforts to optimize their supply paths have resulted in demands for transparency, inventory quality accountability, and 
longer payment terms. Some buyers are demanding access to data that we are restricted from sharing by our arrangements with 
sellers. Providing transparency to our buyers could negatively affect our sellers if buyers favor inventory that have lower fees. These 

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factors may make it difficult for us to increase our business with some buyers, cause some buyers to reduce their spending with us, 
and increase our costs of doing business. 

We have invested heavily in our mobile technology, which poses additional risks that did not affect our legacy desktop display 
business. Mobile connected devices, their operating systems, Internet browsers, or content distribution channels, including those 
controlled by our competitors, may develop in ways that make it difficult for advertisements to be delivered to their users. 
Further, we rely upon relationships with third parties to provide our buyers with access to large numbers of mobile inventory 
sellers that utilize third-party technology to display ads. If our access to mobile inventory is limited by third-party technology or 
lack of direct relationships with mobile sellers, our ability to grow our business will be impaired.

Due to increased usage of mobile devices and resulting migration of advertising spending to mobile platforms, we have 
invested heavily in our mobile technology and are relying to a significant degree on our mobile offerings to fuel our continued 
growth. The mobile advertising market is growing and changing quickly, and technological, market, or regulatory developments 
could render our solution less competitive. Because mobile advertising uses different data-capture techniques and methods of 
recording payable transactions, caters to different buyer budgets, may require us to enter emerging markets in which we have less 
experience, including China and India, and involves development challenges imposed by differing technological requirements and 
standards, there can be no assurance that we will be successful in achieving our goals in this market. Moreover, buyers' spending to 
reach consumers through mobile advertising may evolve more slowly than expected, or not grow to levels we anticipate. Our mobile 
investment has been focused on real-time bidding of mobile impressions, and that market may not grow as we expect. Our mobile 
revenue growth depends to a significant degree on the success of our xAPI technology, which enables us to access inventory 
aggregated by third parties, and there can be no assurance that this technology will continue to work as anticipated, without costly 
bugs or errors. Our success in the mobile channel depends upon the ability of our technology solution to provide advertising for 
most mobile-connected devices, as well as the major operating systems or Internet browsers that run on them and the thousands of 
applications that are downloaded onto them. The design of mobile devices and operating systems, applications, or Internet browsers 
is controlled by third parties. These parties frequently introduce new devices and applications, and from time to time they may 
introduce new operating systems or Internet browsers or modify existing ones in ways that may significantly affect our business, 
such as by providing ad-blocking capabilities or by limiting access to Internet user data. Network carriers may also affect the ability 
to access specified content on mobile devices. If our solution is unable to work on these devices, operating systems, applications, or 
Internet browsers for any reason, our ability to generate revenue through mobile advertising could be significantly impaired.

Our growth depends upon our ability to attract and retain buyers and sellers and increase business with them. Buyers and 
sellers are free to direct their spending and inventory to competing sources of inventory and demand, and large competitors with 
direct mobile user relationships and proprietary first-party user data have invested early and heavily in mobile advertising solutions, 
have many established relationships with mobile buyers and sellers that may be difficult for us to replicate, and may provide more 
compelling solutions than we do. Most of the application providers selling inventory through our platform utilize software 
development kits, or SDKs, and other proprietary technology of third parties, such as aggregators, and it is those third parties, not 
the application providers themselves, that contract with us to provide exchange services to help monetize the inventory. If our 
relationships with these third parties terminate or if the scale of these third parties' business with application providers is reduced, if 
these third parties develop their own solutions that render ours obsolete, or if the third parties' clients begin transacting directly 
between each other rather than through the third party, the amount of mobile inventory available through our platform, could rapidly 
and significantly decline, which in turn would adversely affect our mobile advertising spend and growth prospects.

Fee issues could have a material adverse effect on our business.

A majority of our advertising spend comes from DSP buyers purchasing advertising inventory in RTB transactions on our 

platform. Prior to eliminating our buyer fees on November 1, 2017, our proprietary auction algorithms included a buyer fee for use 
of our technology, and we typically charged buyers a variable price for real-time bidding impressions without specifying the amount 
or method of determining the fee that was included in the price. Buyers and sellers sometimes questioned our buyer fees, and we 
experienced requests from buyers and sellers for discounts, fee concessions or revisions, rebates, refunds, and greater levels of 
pricing transparency and specificity, in some cases as a condition to maintain the relationship. This could continue with respect to 
historical buyer fees. In addition, we charge fees to sellers for use of our technology, typically as a percentage of the cost of media 
and we may decide to offer discounts or other pricing concessions in order to attract more inventory or demand, or to compete 
effectively with other providers that have different or lower pricing structures and may be able to undercut our pricing due to greater 
scale or other factors. 

We also may face the risk that a buyer that is dissatisfied with the execution of a transaction on our platform could request a 
refund from us of the advertising spend on the transaction notwithstanding that we have only collected a fee on the transaction and 
may not have the ability to recover the full amount of spending associated with the transaction from the seller. Our revenue, take 
rate, the value of our business, and the price of our stock could be adversely affected if we cannot maintain and grow our revenue 
and profitability through volume increases that compensate for price reductions, or if we are forced to make significant fee 

22

concessions or refunds, or if buyers reduce spending with us or sellers reduce inventory available through our exchange due to fee 
disputes or pricing issues.

We have a history of losses and we need to sustain and increase investment in our technology in order to be competitive, but we 
face many risks that may prevent us from achieving or sustaining profitability in the future.

We reported net losses of $61.8 million, $154.8 million, and $18.1 million during the years ended December 31, 2018, 2017, 
and 2016, respectively. As of December 31, 2018, we had an accumulated deficit of $315.6 million. During 2018, we were not able 
to sustain our earlier revenue growth and experienced significant declines in revenue and earnings for various reasons including our 
decisions to reduce and then eliminate our buyer fees. We have implemented strategic plans designed to reverse our financial 
declines and return to growth, and have taken steps to reduce unnecessary expenses and redirect spending to areas we expect to 
produce higher growth; however, these plans and steps may ultimately prove to be unsuccessful. 

Notwithstanding these measures, and the ad spend growth experienced in 2018, revenue may continue to decrease due to 

competitive pressures, maturation of our business, or other factors, and additional cost-reduction measures may be required even as 
we must continue to increase investment in technology in response to industry developments and to retain competitiveness. We may 
not be able to return to revenue growth or to achieve or sustain profitability in the future. 

We have encountered and will continue to encounter risks and difficulties frequently experienced by growing companies in 
rapidly evolving industries, including allocating and making effective use of our limited resources; achieving market acceptance of 
our existing and future solutions; competing against companies with greater financial and technical resources; recruiting; 
integrating, motivating, and retaining qualified employees; developing relationships with buyers and sellers; developing new 
solutions; integrating new technologies or companies we acquire; and establishing and maintaining our corporate infrastructure, 
including internal controls relating to our financial and information technology systems. We must improve our current operational 
infrastructure and technology to support significant growth and to respond to the evolution of our market and competitors' 
developments. Our business prospects depend in large part on our ability to:

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grow our share of online and mobile advertising spending and the supply of advertising impressions available to us
notwithstanding the growing share of digital advertising that is controlled by owned and operated sites (such as
Facebook and Google);

return to revenue growth and positive cash flow before depleting our cash resources to the point that our ability to
fund our cash cycle and invest in our business is impaired;

build and maintain our reputation for innovation and solutions that meet the evolving needs of buyers and sellers;

distinguish ourselves from the wide variety of solutions available in our industry;

maintain and expand our relationships with buyers and sellers;

respond to evolving industry standards and government regulations that impact our business, particularly in the
areas of data collection and consumer privacy;

prevent or otherwise mitigate failures or breaches of security or privacy;

attract, hire, integrate and retain qualified employees;

effectively execute upon our international expansion plans;

evaluate new acquisition targets, and successfully integrate acquired companies' businesses and technologies;

maintain our cloud-based technology solution continuously without interruption 24 hours a day, seven days a week;
and

anticipate and respond to varying product life cycles and new advertising solutions such as header bidding,
regularly enhance our existing advertising solutions, and introduce new advertising solutions and pricing models on
a timely basis, including by developing our capabilities in evolving areas of the business, such as mobile and video.

As a result of various factors, our operating results may fluctuate significantly, be difficult to predict, and fall below analysts' 
and investors' expectations.

Our operating results may be difficult to predict, particularly because we generally do not have long-term contracts with 

buyers or sellers. We have experienced significant variations in revenue and operating results from period to period, and operating 
results may continue to fluctuate and be difficult to predict due to a number of factors, including:

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seasonality in demand for digital advertising;

changes in pricing of advertising inventory or pricing for our solution and our competitors' offerings, including
potential further reductions in our pricing and overall take rate as a result of competitive pressure, changes in
supply, improvements in technology and extension of automation to higher-value inventory, uncertainty regarding

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rate of adoption, changes in the allocation of demand spend by buyers, changes in revenue mix, auction dynamics, 
pricing discussions or negotiations with clients and potential clients, header bidding and other factors;

diversification of our revenue mix to include new services, some of which may have lower pricing than our historic
lower-value inventory business or may cannibalize existing business;

the addition or loss of buyers or sellers;

changes in the advertising strategies or budgets or financial condition of advertisers;

the performance of our technology and the cost, timeliness, and results of our technology innovation efforts;

advertising technology and digital media industry conditions and the overall demand for advertising, or changes
and uncertainty in the regulatory environment for us or buyers or sellers, including with respect to privacy
regulation;

the introduction of new technologies or service offerings by our competitors and market acceptance of such
technologies or services;

our level of expenses, including investment required to support our technology development, scale our technology
infrastructure and business expansion efforts, including acquisitions, hiring and capital expenditures, or expenses
related to litigation;

the impact of changes in our stock price on valuation of stock-based compensation or other instruments that are
marked to market;

the effectiveness of our financial and information technology infrastructure and controls;
foreign exchange rate fluctuations; and

changes in accounting policies and principles and the significant judgments and estimates made by management in
the application of these policies and principles.

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Because significant portions of our expenses are relatively fixed, variation in our quarterly revenue could cause significant 
variations in operating results and resulting stock price volatility from period to period. In order to minimize adverse effects of our 
price reductions on revenue, we must increase the inventory and advertising spend on our platform and add more high-value 
inventory, which requires ongoing investment that can adversely affect earnings and might ultimately be unsuccessful. Period-to-
period comparisons of our historical results of operations are not necessarily meaningful, and historical operating results may not be 
indicative of future performance. If our revenue or operating results fall below the expectations of investors or securities analysts, or 
below any guidance we may provide to the market, the price of our common stock could decline substantially.

Our revenue and operating results are highly dependent on the overall demand for advertising. Factors that affect the amount of 
advertising spending, such as economic downturns, can make it difficult to predict our revenue and could adversely affect our 
business.

Our business depends on the overall demand for advertising and on the economic health of our current and prospective sellers 

and buyers. If advertisers reduce their overall advertising spending, our revenue and results of operations are directly affected. 
Various macro factors could cause advertisers to reduce their advertising budgets, including adverse economic conditions and 
general uncertainty about economic recovery or growth, particularly in North America and Europe, where we do most of our 
business, instability in political or market conditions generally, and any changes in favorable tax treatment of advertising expenses 
and the deductibility thereof. Reductions in inventory due to loss of sellers could make our solution less robust and attractive to 
buyers.

Seasonal fluctuations in digital advertising activity could result in material fluctuations of our revenue, cash flows, operating 
results, and other key performance measures from period to period.

Our revenue, advertising spend, cash flow from operations, operating results, and other key performance measures may vary 
from quarter to quarter due to the seasonal nature of advertiser spending. For example, many advertisers devote a disproportionate 
amount of their advertising budgets to the fourth quarter of the calendar year to coincide with increased holiday purchasing, and 
advertising inventory in the fourth quarter may be more expensive due to increased demand for advertising inventory. As a result, 
any events that reduce the amount of advertising spend during the fourth quarter, or reduce the amount of inventory available to 
buyers during that period, could have a disproportionate adverse effect on our revenue and operating results for that fiscal year.

Failure to maintain our culture and institutional knowledge could jeopardize our innovation and operation effectiveness.

We have had significant attrition, including through workforce reductions, and it may become increasingly difficult to retain 
employees given concerns about our financial performance and significant reduction in the value of equity compensation resulting 
from the significant decline we have experienced in the market value of our common stock. Significant changes in our personnel 

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may make it difficult for us to maintain our institutional knowledge and corporate culture, which has materially contributed to our 
success in the past. If our culture and knowledge base are negatively affected, our ability to support our growth and innovation may 
diminish.

Risks Related to the Advertising Technology Industry, Market, and Competition

Market conditions are increasing the costs and risks of our operations.

Due to various factors, including header bidding, market pressure from the increasing share of the digital advertising 
economy absorbed by Google and Facebook, and demands by both buyers and sellers of digital advertising for increased efficiency 
and value throughout the ecosystem, business conditions are becoming more difficult for intermediary businesses like ours. We see 
this in various ways. Both demand and supply for digital advertising inventory outside the “walled garden” companies are becoming 
less unique, contributing to commodification of the business. Buyers and sellers are demanding more favorable trade terms, which 
puts pressure on our cash collections cycle and can require more of our cash to fund our payments, making it unavailable to invest in 
growth. Buyers increasingly require us to accept liability for inventory quality and sellers increasingly require us to accept liability 
for ad content, despite the fact that we are not in direct control of either. Increased buyer vigilance regarding non-human traffic and 
other inventory quality issues, and varying inconsistent methodologies for assessing inventory quality, are causing buyers 
increasingly to withhold payment for transactions they question. Buyers and sellers are increasingly insisting upon using their own 
data to resolve discrepancies in transaction counts more favorably to them, resulting in some revenue loss. These and similar trends 
increase the costs and risks of our operations and put pressure on our margins. 

The digital advertising market is relatively new, dependent on growth in various digital advertising channels, and vulnerable to 
adverse public perceptions and increased regulatory responses. If this market develops more slowly or differently than we expect, 
or if issues encountered by other participants or the industry generally are imputed to or affect us, our business, growth 
prospects and financial condition would be adversely affected.

While our core business of desktop display advertising has been used successfully for many years, marketing via new digital 
advertising channels, such as mobile and social media, out-of-home, and digital video advertising, are emerging and may evolve in 
unexpected ways, and our future growth will be constrained if we are not able to adapt successfully to market evolution. In addition, 
the success of our efforts to advance new solutions for increased advertising automation will depend upon adoption of our solution 
by personnel at buyers and sellers in lieu of their traditional methods of order placement. It is difficult to predict adoption rates, 
demand for our solution, the future growth rate and size of the digital advertising solutions market or the entry of competitive 
solutions.

Further, the digital advertising industry is complex and evolving, and the relatively few publicly traded companies operating 
in the business tend to be small and new to the public markets. Consequently, the digital advertising industry may not be as widely 
followed or understood in the financial markets as more mature industries. The markets may not fully appreciate our particular place 
in the industry and our strengths and differentiating factors. Problems experienced by one industry participant (even private 
companies) or issues affecting a part of the industry have the potential to have adverse effects on other participants in the industry or 
even the entire industry. Emerging understanding of how the digital advertising industry operates has spurred privacy concerns and 
misgivings about exploitation of consumer information and prompted regulatory responses that limit operational flexibility and 
impose compliance costs upon industry participants.

Any expansion of the market for digital advertising solutions depends on a number of factors, including social and regulatory 

acceptance, the growth of the overall digital advertising market and the growth of specific sectors including social, mobile, video, 
and out-of-home as well as the actual or perceived technological viability, quality, cost, performance and value associated with 
emerging digital advertising solutions. If demand for digital display advertising and adoption of automation does not continue to 
grow, or there is a reduction in demand for digital advertising caused by weakening economic conditions, decreases in corporate 
spending, quality, viewability, malware issues or other issues associated with buyers, advertising channels or inventory, negative 
perceptions of digital advertising, additional regulatory requirements, or other factors, or if we fail to develop or acquire capabilities 
to meet the evolving business and regulatory requirements and needs of buyers and sellers of multi-channel advertising, our 
competitive position will be weakened.

We operate in an intensely competitive market that includes companies that have greater financial, technical and marketing 
resources than we do.

We face intense competition in the marketplace. We compete for advertising spending against competitors that, in some 
cases, are also buyers and/or sellers on our platform. We also compete for supply of advertising inventory against a variety of 
competitors. Some of our existing and potential competitors are better established, benefit from greater name recognition, may have 
offerings and technology that we do not have or have significantly more financial, technical, sales, and marketing resources than we 
do. In addition, some competitors, particularly those with greater scale or a more diversified revenue base and a broader offering, 

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may have greater flexibility than we do to compete aggressively on the basis of price and other contract terms, or to compete with us 
by including in their product offerings services that we may not provide. Some competitors are able or willing to agree to contract 
terms that expose them to risks that might be more appropriately allocated to buyers or sellers of advertising (including inventory 
risk and the risk of having to pay sellers for unsold advertising impressions), and in order to compete effectively we might need to 
accommodate risks that could be difficult to manage or insure against. Some existing and potential buyers, have their own 
relationships with sellers or are seeking to establish such relationships, and many sellers are investing in capabilities that enable 
them to connect more effectively directly with buyers. Our business may suffer to the extent that buyers and sellers purchase and 
sell advertising inventory directly from one another or through other intermediaries other than us, reducing the amount of 
advertising spend on our platform. In addition, as a result of solutions introduced by us or our competitors, our marketplace will 
experience disruptions and changes in business models, which may result in our loss of buyers or sellers. Our innovation efforts may 
lead us to introduce new solutions that compete with our existing solutions. New or stronger competitors may emerge through 
acquisitions and industry consolidation or through development of disruptive technologies. If our offerings are not perceived as 
competitively differentiated, we could lose clients, market share or be compelled to reduce our prices, making it more difficult to 
grow our business profitably.

There has been rapid evolution and consolidation in the advertising technology industry, and we expect these trends to 

continue, thereby increasing the capabilities and competitive posture of larger companies, particularly those that are already 
dominant in various ways, and enabling new or stronger competitors to emerge. For example, while we are investing to participate 
in the shift of digital advertising spending to mobile channels, the mobile advertising market is dominated by a relatively small 
number of large competitors with direct mobile user relationships and proprietary first-party user data. These competitors have 
invested early and heavily in mobile advertising solutions that may be more compelling than ours, and have many established 
relationships with buyers and sellers that may be difficult for us to replicate. Similar dynamics can be expected as growth in digital 
video advertising brings established broadcast and content companies into the digital advertising business.

As technology continues to improve and market factors continue to attract investment, competition and pricing pressure may 
increase and market saturation may change the competitive landscape in favor of larger competitors with greater scale and broader 
offerings, including those that can afford to spend more than we can to grow more quickly and strengthen their competitive position 
through innovation, development and acquisitions. In order to compete effectively, we may need to innovate, further differentiate 
our offerings, and expand the scope of our operations more quickly than would be feasible through our own internal efforts. 
However, because some capabilities may reside only in a small number of companies, our ability to accomplish necessary expansion 
through acquisitions may be limited because available companies may not wish to be acquired or may be acquired by larger 
competitors with the resources to outbid us, or we may need to pay substantial premiums to acquire those businesses. Our ability to 
make strategic acquisitions has also been hampered by the significant decline we have experienced in the value of our common 
stock, because our stock may not be viewed favorably as acquisition currency by an acquisition target, and the lower our stock price, 
the more dilution results from stock-based acquisitions.

Many buyers and sellers are large consolidated organizations that may need to acquire other companies in order to grow. 
Smaller buyers and sellers may need to consolidate in order to compete effectively. There is a finite number of large buyers and 
sellers in our target markets, and any consolidation of buyers or sellers may give the resulting enterprises greater bargaining power 
or result in the loss of buyers and sellers that use our platform, and thus reduce our potential base of buyers and sellers, each of 
which would lead to erosion of our revenue.

Acts of competitors and other third parties can adversely affect our business.

Our revenue is vulnerable to acts by third parties that reduce the amounts of spending or inventory available to us. For 
example, the amount of inventory available to independent platforms like us could be reduced as a result of decisions by Facebook 
to emphasize content viewable through its site or to favor friends-and-family type feeds over third-party properties, or decisions by 
Google to utilize its ad server advantages to outbid us and other competitors in open-market transactions. Similarly, decisions by 
buyers and sellers to transact directly rather than through us would tend to reduce both spending and inventory on our platform. 
Finally, nefarious, illegal, or disreputable acts by one or more of our competitors could affect the reputation and trustworthiness of 
the ad tech industry as a whole, which could negatively affect our revenue because buyers and sellers could decide to focus their 
activities on larger, more established industry participants.

Our business depends on our ability to collect and use data to deliver advertisements, and to disclose data relating to the 
performance of advertisements. Any limitation imposed on our collection, use or disclosure of this data could significantly 
diminish the value of our solution and cause us to lose sellers, buyers, and revenue. Consumer tools, regulatory restrictions and 
technological limitations all threaten our ability to use and disclose data.

The more informed advertising is about its audience, the more valuable it is. Skywriting and highway billboards are 

examples of generalized advertising, casting a broad net across an undifferentiated audience in hopes of capturing a few of the 

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viewers the advertiser hopes to reach. "Contextual" advertising attempts to reach audiences based upon inferences about their 
interests drawn by, for example, what websites they visit or apps they use. Programmatic advertising, facilitated by the ad tech 
ecosystem, enables more precise audience targeting, known as "behavioral" or "personalized" advertising.  Behavioral advertising is 
more effective and valuable for buyers than general or contextual advertising, resulting in more revenue for publishers.  In order to 
perform behavioral advertising, we and our clients must be permitted to use data in a variety of ways, as further set forth below.  

As we process transactions through our solution, we are able to collect significant amounts of information about 

advertisements, their buyers and sellers, and the transactions themselves. This includes buyer and seller preferences and 
requirements for media and advertisement content and specifications such as placement, size and format; pricing of advertisements; 
and auction activity such as price floors, bid response behavior, and clearing prices. We also are able to collect certain information 
about users, including browser or device location and characteristics; online behavior; exposure to and interaction with 
advertisements; and inferential data about purchase intentions and preferences. We collect this data through various means, 
including from our own systems, pixels, web beacons, software development kits installed in mobile applications, and "cookies," 
which are small text files placed through an Internet browser on an Internet user's computer. Our sellers and buyers also may 
provide us with their proprietary data about users.

  We aggregate this data over trillions of advertising impressions and analyze it in order to enhance our services, including 
the pricing, placement and scheduling of advertisements purchased by buyers across the advertising inventory provided by sellers. 
We also share this data, or analyses based upon the data, with clients as part of our services. Our ability to collect, use, and share 
data about advertising purchase and sale transactions and user behavior and interaction with content is critical to the value of our 
services, and any limitation on our data practices could impair our ability to deliver effective solutions that meet the needs of sellers 
and buyers of advertising, resulting in loss of volume and reduced pricing. Any restriction on the types of technology we use to 
capture user or inventory information could make placement of advertising through our solution less valuable, with commensurate 
reductions in revenue.

  Internet users can, with increasing ease, implement practices or technologies that may limit our ability to collect and use 

data to deliver advertisements, or otherwise inhibit the effectiveness of our solution. First, cookies may easily be deleted or blocked 
by Internet users. All of the most commonly used Internet browsers allow Internet users to modify their browser settings to block 
first-party cookies (placed directly by the publisher or website owner that the user intends to interact with) or third-party cookies 
(placed by parties, like Rubicon Project, that have no direct relationship with the user), and some browsers, such as Safari and 
Firefox, may block third-party cookies by default. Most browsers also now support temporary privacy modes that allow the user to 
suspend, with a single click, the placement of new cookies or reading or updates of existing cookies. Many applications and other 
devices allow users to avoid receiving advertisements by paying for subscriptions or other downloads. Mobile devices based upon 
the Android and iOS operating systems limit the ability of cookies to track users while they are using applications other than their 
web browser on their device (and may, in the future, limit the use of mobile device identifiers for advertising). As a consequence, 
fewer of our cookies or sellers' cookies may be set in browsers or be accessible in mobile devices, which adversely affects our 
business. If our ability to use cookies or identify Internet users is limited, transactions occurring through our solution would be 
executed with less insight into activity that has taken place by the user, reducing the accuracy of buyers' decisions about which 
inventory to purchase for an advertising campaign.  We may be required to develop or obtain additional technologies to compensate 
for the lack of cookie data, which could be time consuming to develop or costly to obtain, less effective than our current use of 
cookies, and subject to additional regulation.  

  Some Internet users also download free or paid "ad blocking" software, not only for privacy or security reasons, such as a 
desire to avoid being targeted for ads based upon location or online activity, but also to counteract the adverse effect advertisements 
can have on users' experience, including increased load times, data consumption, and screen overcrowding. Similar ad blocking 
technology has also recently emerged for mobile devices. Such ad blocking technology may prevent certain third-party cookies, or 
other tracking technologies, from being stored on a user's computer or mobile device. If more Internet users adopt these measures, 
our business could be harmed. Ad blocking technologies could have an adverse effect on our business if they reduce the volume or 
effectiveness (and therefore value) of advertising. In addition, some ad blocking technologies block only ads that are targeted 
through use of third-party data, while allowing ads based on first-party data (i.e. data owned by the provider of the website or 
application being viewed). These ad blockers could place us at a disadvantage because we rely on third-party data, while large 
competitors have troves of first-party data they use to direct advertising. Other technologies allow ads that are deemed "acceptable," 
which could be defined in ways that place us or our clients at a disadvantage, particularly if such technologies are controlled or 
influenced by our competitors. Even if ad blockers do not ultimately have a material impact on our business, investor concerns 
about ad blockers could cause our stock price to decline.

  Current versions of the most widely used web browsers allow users to send "Do Not Track" signals to indicate that they do 
not wish to have their web usage tracked. There is currently no definition of "tracking" and no set of commonly accepted standards 
regarding how to respond to a "Do Not Track" preference, but if such standards are implemented, either by applicable law or 
industry self-regulation, they could impose significant requirements and limitations on our data collection. Some proposed standards 
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would allow first parties to continue to track users, even if the users have enabled the "Do Not Track" signal in their web browser, 
but would prevent third parties, like us, from any further tracking of such users across the Internet. Such a standard would place us 
at a significant competitive disadvantage compared to first-party data owners such as large website operators, many of whom own 
or are developing or acquiring capabilities that compete with our solution. Even absent an industry standard, various government 
authorities have indicated an intent to implement some type of "Do Not Track" standard. Such legislation or regulation may affect 
our ability to collect or use data collected through our platform when a user enables "Do Not Track," and may also include a 
distinction between first-party and third-party collection and usage of data, which may impact our ability to compete in the 
marketplace. We may separately elect to respond to any such legislation by adopting a policy to discontinue profiling or web 
tracking in response to "Do Not Track" requests, and it is possible that we could in the future be prohibited from using non-personal 
consumer data by industry standards or state or federal legislation, which may diminish our ability to target and improve 
advertisements and the value of our services.

  Further, much of the data we collect and use belongs to our buyers or sellers, and we receive their permission to use it. 

(Other data is subject to control by Internet users, either as a result of regulation or through choices such as behavioral advertising 
opt-outs or use of ad blocking technologies, as discussed below). We use data related to our buyers and sellers and their 
transactional activity on our platform to facilitate our services, but we must exercise care not to use this data in ways that provide 
unfair advantages to, or adversely affect, buyers or sellers. Although our sellers and buyers generally permit us to aggregate and use 
data from advertising placements, subject to certain restrictions, sellers or buyers might decide to restrict our collection or use of 
their data. There could be various reasons for this, including perceptions by buyers that their data can be used by sellers to extract 
higher prices for impressions, or perceptions by sellers that their data can be used by buyers to bid tactically to reduce pricing for 
impressions. Buyers and sellers may also request that we discontinue using data obtained from their transactions that has already 
been aggregated with other data. It would be costly and difficult, if not impossible, to comply with such requests. As consumers 
continue to increase their use of digital technology and to incorporate multiple devices into their lives, linking and using data across 
such devices will become increasingly important. Various challenges affect our ability to link data relating to discrete devices or 
browsers, including different technologies, increased user awareness and sensitivity regarding use of data about their device usage, 
and evolving regulatory and self-regulatory standards. These challenges may slow growth, and if we are not able to cope with these 
challenges as effectively as other companies, we will be competitively disadvantaged. Any limitation on our ability to collect data 
about user behavior and interaction with content could make it more difficult for us to deliver effective solutions that meet the needs 
of sellers and buyers.

If cookies are replaced by alternative tracking mechanisms, our performance may decline and we may lose buyers and revenue.

  Some prominent sellers have announced intentions to discontinue the use of cookies, and to develop alternative methods 

and mechanisms for tracking web users. It is possible that these companies may rely on proprietary algorithms or statistical methods 
to track web users without cookies, or may utilize log-in credentials entered by users into other web properties owned by these 
companies, such as their digital email services, to track web usage, including usage across multiple devices, without cookies. 
Alternatively, such companies may build different and potentially proprietary user tracking methods into their widely-used web 
browsers.

  If cookies are effectively replaced by proprietary alternatives, our continued reliance upon cookie-based methods may face 
negative consumer sentiment and otherwise place us at a competitive disadvantage, compelling us to develop or license alternative 
proprietary tracking methodologies. Development would take time, potentially subjecting us to competitive disadvantages, and 
require substantial investment from us. Development also may not be commercially feasible given our relatively small size, the fact 
that development of such technologies may require technical skills that differ from our core engineering competencies, and the 
likelihood that the market would adopt solutions developed by larger competitors. Licensing new proprietary tracking mechanisms 
and data from companies that have developed them may not be viable for us for various reasons; creators of such technology may 
compete with us and may offer to provide the technology to us only on unfavorable terms or not at all, and if proprietary web 
tracking standards are owned by sellers or browser operators that have access to user information by virtue of their popular 
consumer-oriented websites or browsers and design their technology for use in conjunction with the types of user information 
collected from their websites or design their browser to disfavor third-party cookies, we may still be at a competitive disadvantage 
even if we license their technology.

  If cookies are effectively replaced by open industry-wide tracking standards rather than proprietary standards, we may still 
incur substantial re-engineering costs to replace cookies with these new technologies. This may also diminish the quality or value of 
our services to buyers if such new technologies do not provide us with the quality or timeliness of the data that we currently 
generate from cookies.

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Legislation and regulation of digital businesses, including privacy and data protection regimes, could create unexpected 
additional costs, subject us to enforcement actions for compliance failures, or cause us to change our technology solution or 
business model, which may have an adverse effect on the demand for our solution.

  Many local, state, federal, and international laws and regulations apply to the collection, use, retention, protection, 
disclosure, transfer, and other processing of data collected from and about consumers and devices, and the regulatory framework for 
privacy issues is evolving worldwide. Various U.S. and foreign governments, consumer agencies, self-regulatory bodies, and public 
advocacy groups have called for new regulation directed at the digital advertising industry in particular, and we expect to see an 
increase in legislation and regulation related to the collection and use of data to target advertisements and communicate with 
consumers—including the use of mobile device and cross-device data, geo-location data, anonymous Internet user data and unique 
device identifiers, such as IP address or mobile advertising identifiers—and the collection of data from apps and websites that are 
directed to children. Such legislation or regulation could affect the costs of doing business online and may adversely affect the 
demand for or the effectiveness and value of our solution. Some of our competitors may have more access to lobbyists or 
governmental officials and may use such access to effect statutory or regulatory changes in a manner that commercially harms us 
while favoring their solutions.

  Various federal privacy bills have been introduced in the U.S. Congress recently and a number of state legislatures, 
including California, have passed or are considering privacy bills. These regulations may place significant restrictions on the 
collection and use of certain types of data used for behavioral advertising. The FTC has issued guidance on how companies should 
apply privacy principles to tracking and delivering targeted advertisements to consumers across multiple devices. The FTC has also 
adopted revisions to the Children's Online Privacy Protection Act that expand liability for the collection of information (including 
certain anonymous information such as persistent identifiers) by operators of websites and other online services that are directed to 
children or that otherwise use (for certain purposes) information collected from or about children. 

  On June 28, 2018, California passed a privacy law in the California Consumer Privacy Act of 2018 ("CCPA"), which grants 

California residents certain rights with respect to their personal information. The CCPA is the most comprehensive data privacy 
regulation to date in the United States, and could be the precursor to other similar legislation in other states or at the federal level. 
The CCPA expands the definition of personal information, which captures the types of data that we collect, such as device 
identifiers and IP addresses. Under the CCPA, businesses are required to grant expansive access, deletion and portability rights to 
consumers in the United States, similar to those provided under the GDPR. The law may also impose burdensome storage and 
compliance obligations on publishers and ad tech companies. Interpretation of the requirements remains unclear due to the recent 
passage of the regulation. The law is expected to take effect in 2020. The CCPA may precipitate additional privacy regulation by 
federal, state and local governments, which may increase our compliance costs and strain our technical capabilities, and which may 
conflict with each other. If we are unable to comply with the CCPA or other related legislation in the future, we may be subject to 
regulatory or private investigations, and if we are unable to use information for behavioral advertising as we have in the past, our 
business could be materially affected. 

  In addition, the European Union has adopted the General Data Protection Regulation, Regulation (EU) 2016/679. A key 

feature of the GDPR is that it treats much of the end-user information that is critical to programmatic digital advertising as "personal 
data" and therefore subject to significant conditions and restrictions on its collection and use. Without this end-user information, the 
value of programmatic advertising inventory diminishes, resulting in lower demand and prices, and potentially less ad spend and 
revenue for us and other industry participants. The GDPR also sets out higher potential liabilities for certain data protection 
violations and creates a greater compliance burden for us in the course of delivering our solution in Europe (as outlined further 
below). The regulatory climate in Europe, in particular, has grown increasingly unfavorable for advertising technology-based 
business. Regulators have expressed antipathy towards common technologies deployed in digital advertising and we anticipate 
increased regulatory scrutiny on the digital advertising industry as a whole. 

  Further, many governments are restricting the transmission or storage of information about individuals beyond their 

national borders. Such restrictions could, depending upon their scope, limit our ability to utilize technology infrastructure 
consolidation, redundancy, and load-balancing techniques, resulting in increased infrastructure costs, decreased operational 
efficiencies and performance, and increased risk of system failure.

  These laws and regulations are continually evolving, not always clear, and not always consistent across the jurisdictions in 
which we do business. Any failure to protect, and comply with applicable laws and regulations or industry standards applicable to, 
personal data or other data relating to consumers could result in enforcement action against us, including fines, imprisonment of our 
officers, and public censure, claims for damages by consumers and other affected individuals, damage to our reputation, and loss of 
goodwill. This is particularly true given that the FTC, Attorneys General of various U.S. States and various international regulators 
(including numerous data protection authorities in the European Union), have specifically cited as enforcement priorities certain 
practices that relate to digital advertising. Even the perception of concerns relating to our collection, use, disclosure, processing, and 
retention of data, including our security measures applicable to the data we collect, whether or not valid, may harm our reputation 

29

(and the reputation of the digital advertising ecosystem) and inhibit adoption of our solution by current and future buyers and 
sellers. We are aware of ongoing lawsuits filed against, or regulatory investigations into, companies in the digital advertising 
industry concerning various alleged violations of consumer protection, data protection, and computer crime laws, asserting various 
privacy-related theories. Any such proceedings brought against us could hurt our reputation, force us to spend significant amounts in 
defense of these proceedings, distract our management, increase our costs of doing business, adversely affect the demand for our 
services or the digital advertising industry at large, and ultimately result in the imposition of monetary liability or restrictions on our 
ability to conduct our business. We may also be contractually liable to indemnify and hold harmless buyers or sellers from the costs 
or consequences of litigation or regulatory investigations resulting from using our services or from the disclosure of confidential 
information, which could damage our reputation among our current and potential sellers or buyers, require significant expenditures 
of capital and other resources and cause us to lose business and revenue.

Legal and compliance uncertainties resulting from effectiveness of the GDPR may result in substantial risk to our ad spend and 
revenue.

The GDPR, which became effective on May 25, 2018, has imposed significant new regulatory requirements that are 
applicable to us as well as our clients and competitors. As is frequently the case with transformative new laws, some critical 
elements of the GDPR are still unclear, and consistent regulatory guidance has yet to be developed, and established industry 
compliance practices have yet to emerge. Compliance stakes are high because penalties for violation of the law can reach up to the 
greater of 20 million Euros or 4% of total worldwide annual turnover (revenue). Further, compliance is complicated by the potential 
for differing interpretation and enforcement of the GDPR by regulators in each of the EEA’s member states. The reach of the GDPR 
extends well beyond ad tech, but some observers believe that ad tech may become a special focus of enforcement due to the 
concerns many European privacy regulators have expressed about digital behavioral advertising.

If European publishers react by choosing to monetize their content through non-advertising-based methods (such as paid 

subscriptions), or reduce use of personal data subject to the GDPR in order to reduce compliance cost and risk, the volume and 
value of impressions available through our exchange would decrease, with potentially significant adverse consequences for our 
business. If we are subjected to regulatory investigations or private claims, we could face significant fines and losses, and our 
financial position could be materially affected. In addition, the GDPR permits some form of representative actions, which may be 
similar to class actions or collective actions in the United States. Allowing such representative actions may incentivize parties, 
organizations, and/or advocates to pursue private legal action relating to data protection violations more aggressively. 

The GDPR generally prohibits the transfer of personal data of EU subjects outside of the European Union, unless a lawful 

data transfer solution has been implemented or a data transfer derogation applies.  The Rubicon Project, Inc. is established in the 
United States of America and has certified its compliance to the EU-US Privacy Shield.  The Privacy Shield is a privacy framework 
that the European Commission has declared provides "adequate" protection for personal data, and this enables The Rubicon Project, 
Inc. to receive personal data lawfully from the EU for as long as it complies with the Privacy Shield.  If The Rubicon Project, Inc. 
fails to comply with the Privacy Shield (or with EU data protection rules more generally), it risks investigation and sanction by EU 
or US regulatory authorities, include the Federal Trade Commission. Each such investigation could cost us significant time and 
resources, and could potentially result in fines, criminal prosecution, or other penalties.

Further, the Privacy Shield, as well as some alternative compliance measures that we may also use for extra-EU data 
transfers, such as EU Commission approved data export agreements called Standard Contractual Clauses, are facing legal and 
political challenges. For example, in July 2018, the EU Parliament called for the suspension of the EU-US Privacy Shield by 
September 1st, 2018, although this did not happen. Further, in Data Protection Commissioner v. Facebook and Maximillian 
Schrems, the question of whether Standard Contractual Clauses enable lawful transfers of personal data from the EU has been 
referred by the Irish High Court to the Court of Justice of the European Union. If these challenges successfully invalidate the 
Privacy Shield or the alternative compliance measures that we currently rely on or may choose to rely on in the future, it may take 
us significant time, resources, and effort to restructure our business and/or rely on another legally sufficient compliance measure. 
Additionally, such an invalidation might affect our reputation with our clients, who may choose to work with businesses that do not 
rely on such compliance mechanisms to ensure legal and regulatory compliance, such as EU-based companies or other competitors 
that do not need to transfer personal data to the United States in order to avoid the above-identified risks and legal issues.

The GDPR imposes new requirements for end user consent and legal basis for data processing that are not yet well understood.

End-user consent to data collection through device access (including the placement of cookies) has been required for some 
time under the European Union Privacy and Electronic Communications Directive (Directive 2002/58/EC), commonly referred to as 
the "ePrivacy Directive," but the GDPR has added complexity and risk. End-user consent is difficult for ad tech intermediaries like 
us to obtain because we do not have direct relationships with such end users, so we have historically relied upon publishers to obtain 
consent for our technology under the ePrivacy Directive. To the extent any seller does not adequately satisfy their consent 
obligations for our technology, we may face regulatory risk. Further, emerging regulatory guidance has challenged this method of 

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obtaining consent. To the extent we (and/or our buyers) are required to obtain or confirm consent directly from end users, our ability 
to use cookies or access devices within the EEA may become significantly restricted.

While simple click-through cookie banners on EU-based digital media properties had been the norm for ePrivacy Directive 

compliance, it may become more challenging to obtain valid consent from European end users because the GDPR will likely be 
interpreted to impose additional requirements applicable to end-user consents generally. In order to obtain valid consent, end users 
must be provided with increasingly granular data about cookies placed in the course of delivering an advertisement, including 
cookies placed by us, or by buyers using our technology. Providing this granular level of data may be difficult to do, considering 
user interface restrictions, and in some cases, may not be possible. Further, if consent mechanisms become too cumbersome or 
unwieldy, end users are more likely to decline. This may result in lower levels of users' consent for accessing of their devices and 
processing of their personal data. Without consent, our publishers may not attempt to monetize inventory associated with such end 
users at all, or pass that inventory to us without personal data, which will reduce the value of such inventory.

In 2018, IAB Europe released a tool, the Transparency and Consent Framework (the "TCF"), in order to assist publishers, 

advertisers and advertising technology providers, with the process of obtaining consent from end users in accordance with the 
GDPR (and also to provide end users with greater transparency in the advertising chain).  In order for a publisher to use this tool, it 
must implement a "consent management provider" (CMP) to notify end users about the vendors that may access their personal data 
and their intended uses. The CMP then generates a consent string to distribute information to vendors about the end user’s consent 
preferences. There is limited guidance regarding proper implementation of the tool and some publishers and ad tech providers may 
not be using the tool or interpreting consent signals correctly. The TCF continues to evolve and we will need to devote internal 
resources to support any additional requirements imposed by the TCF (and possibly other consent tools). It is also not yet clear 
whether the TCF (or any other) consent tool will be accepted by regulators as appropriate consent mechanisms. Consent tool 
adoption remains in the early stages and it is unclear whether the market will widely adopt one standard. Some buyers may decline 
to bid on impressions from the EEA due to ambiguity about their rights, or may only bid on impressions that are stripped of personal 
data and converted to contextual advertising. This will have the effect of reducing demand for and value of EEA impressions on our 
platform. 

Large integrated purchasers of ad inventory like Google may also have an advantage in obtaining the consent they need 
directly from their end users. It is not clear whether Google will participate in the TCF. If Google chooses not to participate in the 
TCF, broad adoption of the TCF by publishers may be limited.

As a result of the factors set forth above, our or our clients’ ability to place or use third-party cookies or access mobile 

devices, may become significantly impaired in certain jurisdictions. The EU is also expected to replace the ePrivacy Directive with 
the ePrivacy Regulation. Current drafts of the ePrivacy Regulation propose significant requirements around obtaining consent, and 
impose fines for violations that are materially higher than those imposed under the ePrivacy Directive. 

It remains unclear whether certain legal bases for data processing are permitted for behavioral advertising.

The GDPR sets forth six alternative legal bases for processing personal data, but only two are relevant to ad tech: consent 
by the data subject and "legitimate interests," which means that "processing is necessary for the purposes of the legitimate interests 
pursued by the controller or by a third party, except where such interests are overridden by the interests or fundamental rights and 
freedoms of the data subject." We generally rely upon legitimate interests. There is minimal guidance on the factors that would 
override any legitimate interest for processing.  Some EU regulators or courts may conclude that the processing of personal data for 
the purposes of behavioral advertising does not satisfy the legitimate interests of the controller, or that such interests do not 
outweigh the privacy rights of end users, even with respect to ad tech parties that only collect pseudonymous personal data. 
Unavailability of this basis for processing end users’ personal data would require us to obtain end-user consent for processing under 
the GDPR, which may not be possible for us, or other ad tech intermediaries, without changes to the ad tech business that would be 
difficult, time-consuming, expensive, and perhaps unattainable. These complexities are compounded by the ability of different 
national and state governmental authorities within the EU to adopt differing interpretative and enforcement approaches to the law.

Google currently relies on end-user consent as its legal basis for processing personal data, and has required its publishers 

and ad tech partners to obtain such end-user consent on behalf of Google. We are reliant upon third parties to obtain consent for 
Google in accordance with their policies. Consent is relatively easier for Google to obtain because of its direct relationships with 
end users and importance to publishers, but its practices may not translate well across the industry. If publishers are unable to obtain 
this consent our revenue and advertising spend could decline.

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Legal uncertainty and industry unpreparedness may mean substantial disruption and inefficiency, demand constraints, and 
reduced inventory supply and value.

Some publishers may be unprepared to comply with evolving regulatory guidance under the GDPR, and therefore may 

remove personal data from their inventory before passing it into the bid stream, at least temporarily. This will lower their inventory 
on the value scale from behavioral to contextual advertising, resulting in loss of ad spend and revenue for us. Even well-prepared 
publishers and buyers will be confronted with difficult choices and administrative and technical hurdles to implement their GDPR 
compliance programs and integrate with multiple other parties in the ecosystem. Further, compliance program design and 
implementation will be an ongoing process as understanding of the new law increases and industry compliance standards evolve. 
The resulting process friction could result in substantial inefficiency and loss of inventory and demand, as well as increased burdens 
upon our organization as we seek to assist clients and adapt our own technology and processes as necessary to comply with the law 
and adapt to industry practice. The uncertain regulatory environment caused by the GDPR may benefit large, integrated competitors 
like Google and Facebook, which have greater compliance resources and can take advantage of their direct relationships with end 
users to secure consents from end users that we and other intermediaries without direct user relationships are less able to obtain 
under current industry conditions.

The UK's decision to leave the European Union may add costs and complexity to our compliance efforts.

The UK's decision to leave the European Union may add cost and complexity to our compliance efforts. If the UK leaves 
the EU with a "no deal" Brexit on March 29th, 2019, then additional compliance measures, such as Standard Contractual Clauses, 
may need to be implemented at very short notice to enable continuing transfers to our UK subsidiary company. Further, transfers 
from and processing of data in the UK will become subject to UK data protection law, and we will also need to adapt separately to 
any new UK requirements. Complying with any new regulatory requirements could force us to incur substantial costs, impact how 
clients view our technology, or require us to change our business practices in a manner that could reduce our revenue or compromise 
our ability to effectively pursue our growth strategy.

The U.S. comprehensive tax reform bill of 2017 could adversely affect our business and financial condition.

On December 22, 2017, the U.S. government enacted comprehensive Federal tax legislation commonly referred to as the 
Tax Cuts and Jobs Act of 2017 ('"Tax Act"). The Tax Act, among other things, includes changes to U.S. federal tax rates, imposes 
future limitations on the deductibility of Research and Development expenditures and net operating loss carryforwards, allows for 
the expensing of capital expenditures, and puts into effect the migration from a worldwide system of taxation to a territorial system. 
We are continuing to evaluate the Tax Act and its requirements, as well as its application to our business and its impact on our 
effective tax rate. Additionally, U.S. states' incorporation of these federal law changes, or portions thereof, into their tax codes may 
result in higher future state tax liabilities. The implementation by us of new practices and processes designed to comply with and 
benefit from, the Tax Act and its rules and regulations could require us to make substantial changes to our business practices, 
allocate additional resources, and increase our costs, which could negatively affect our business, results of operations and financial 
condition.

We generally do not have contractual privity with Internet users who view advertisements that we place, and we may not be able 
to disclaim liabilities from such Internet users or consumers.

Potential sources of liability to Internet users include malicious activities, such as the introduction of malware into users' 

computers through advertisements served through our platform, and code that redirects users to sites other than the ones users 
sought to visit, potentially resulting in malware downloads or use charges from the redirect site. Sellers of advertisement space 
purchased through our solution often have terms of use in place with their users that disclaim or limit their potential liabilities to 
such users, or pursuant to which users waive rights to bring class-action lawsuits against the sellers related to advertisements. 
Certain of our competitors are also prominent sellers, and may be able to include protections in their website or application terms of 
use that also limit liability to users of their advertising services. We generally do not have terms of use in place with such users. As a 
consequence, we generally cannot disclaim or limit potential liabilities to such users through terms of use, which may expose us to 
greater liabilities than competing advertising networks that are also prominent sellers.

Changes in market standards applicable to our solution could require us to incur substantial additional development costs.

Market forces, competitors' initiatives, regulatory authorities, industry organizations, seller integration revisions, and security 
protocols are causing the emergence of demands and standards that are or could be applicable to our solution. We expect compliance 
with these kinds of standards to become increasingly important to buyers and sellers, and conforming to these standards is expected 
to consume a substantial and increasing portion of our development resources. If our solution is not consistent with emerging 
standards, our market position and sales could be impaired. If we make the wrong decisions about compliance with these standards, 

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or are late in conforming, or if despite our efforts our solution fails to conform, our offerings will be at a disadvantage in the market 
to the offerings of competitors that have complied.

The evolving concept of viewability involves competitive uncertainty and may cause us to incur additional costs and liability risk.

Viewability of digital advertising inventory is relevant to marketers because it represents a way of assessing the value of 

particular inventory as a means to reach a target audience. However, there is no consensus definition of viewability. Some 
approaches focus on whether an advertisement can be seen at all, and others focus on whether an advertisement that can be seen is 
actually seen, in whole or part, or for how long. Low viewability can be caused by various factors, including technical issues (e.g. 
device screen size, browser functionality and settings, web site load times), media design (e.g. below-the-fold or sub-page 
placements), and user behavior (e.g. the decision whether to scroll down a website or click on an advertisement or how long to 
watch a video). Non-viewability is a separate issue and may result, for example, from stacking ads so the one in the back is 
obscured, or serving ads into a single pixel space too small to be seen. 

Aside from non-viewable inventory, which is generally well understood, various vendors and other industry participants 

advocate definitions and measurements of low viewability that are consistent with their technology or interests. We cannot predict 
whether consensus views will emerge, or what they will be. Nevertheless, some themes seem to have emerged:

•

•

•

•

Buyers of advertising inventory are increasingly using technology, often provided by third parties, to assess
viewability of impressions for use as a bidding or purchasing criterion, or to determine value for purposes of
determining pricing.

Assessment of viewability is imperfect, but technology can be expected to improve as data providers, DSPs, and
buyers themselves develop viewability assessment tools and build viewability factors into their algorithms for
bidding, purchasing, and pricing decisions.

Inventory viewability and value correlate. More viewable inventory is more valuable, and viewability of inventory
increases in importance with the price paid for that inventory.

Viewability can be used as an inventory differentiator, by domain or on an impression level, with higher viewability
generally associated with higher value and pricing, and lower viewability generally associated with lower value and
pricing.

These themes are relevant to our business of facilitating fully informed purchase and sale of advertising, and the evolution of 

viewability standards may represent an opportunity to refine matching of supply and demand. However, incorporating viewability 
concepts fully into our business as they evolve will require us to incur additional costs to integrate relevant technologies and process 
additional information through our system. If we do not handle viewability well, we could be competitively disadvantaged.

In addition, inventory that is well differentiated on the basis of viewability will also be differentiated on the basis of value, 

with less viewable inventory valued lower. In this context, if we are not positioned to transact the higher viewability inventory 
competitively, our revenue and profitability could be adversely affected.

As we have experienced in the past, buyers could attempt to hold us responsible, and not to pay us, for impressions that do 

not satisfy their viewability requirements or expectations, and depending upon how viewability evolves, market practice or 
emerging regulation may require us to incur compliance costs and assume some responsibility for viewability of advertisements 
transacted through our solution. Divergent views of how to measure viewability and imperfect measurement technology could lead 
to disagreement, increasing risk of disputes, demands for refunds, and reputational harm.

Failure to comply with industry self-regulation could harm our brand, reputation, and our business.

In addition to compliance with government regulations, we voluntarily participate in trade associations and industry self-
regulatory groups that promulgate best practices or codes of conduct addressing privacy and the provision of digital advertising. 
However, in the past, some of these guidelines have not comported with our business practices, making them difficult for us to 
implement. If we encounter difficulties in the future, or our opt-out mechanisms fail to work as designed, or if digital media users 
misunderstand our technology or our commitments with respect to these principles, we may be subject to negative publicity, as well 
as investigation and litigation by governmental authorities, self-regulatory bodies or other accountability groups, buyers, sellers, or 
other private parties. Any such action against us could be costly and time consuming, require us to change our business practices, 
divert management's attention and our resources, and be damaging to our reputation and our business. In addition, we could be 
adversely affected by new or altered self-regulatory guidelines that are inconsistent with our practices or in conflict with applicable 
laws and regulations in the United States and other countries where we do business. As a result of such inconsistencies or conflicts, 
or other business or legal considerations, we may choose not to comply with some self-regulatory guidelines. Additionally, as we 
expand geographically, we may begin to operate in jurisdictions that have self-regulatory groups in which we do not participate. If 
we fail to abide by or are perceived as not operating in accordance with applicable laws and regulations and industry best practices, 

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or any industry guidelines or codes with regard to privacy or the provision of Internet advertising, our reputation may suffer and we 
could lose relationships with buyers and sellers.

Forecasts of market growth may prove to be inaccurate, and even if the market in which we compete achieves the forecasted 
growth, our business may not grow at similar rates, if at all.

We have in the past provided, and may continue to provide, forecasts related to our market, including forecasts relating to the 

expected growth in the digital advertising market and parts of that market as well as the forecasted trend towards automation of 
analog and print advertising markets. Growth forecasts are subject to significant uncertainty and are based on assumptions and 
estimates that may prove to be inaccurate. Moreover, the anticipation that the advertising industry will continue to shift from analog 
and print media to digital advertising at the rate forecasted may not come to fruition. Further, even if the market grows, we may not. 
Our plans to enter or increase our presence in various markets may not succeed for various reasons, including possible shortfall or 
misallocation of resources or superior technology development or marketing by competitors. Large competitors, principally Google 
and Facebook, have absorbed a large portion of recent growth in digital advertising spending and appear well positioned to continue 
to do so, making it more difficult for smaller companies like us to participate in market growth without taking share from 
competitors.

Risks Related to Our Relationships with Buyers and Sellers and Other Strategic Relationships

Our contracts with buyers and sellers are generally not exclusive and generally do not require minimum volumes or long-term 
commitments. If buyers or sellers representing a significant portion of the demand or inventory in our marketplace decide to 
materially reduce the use of our solution, we could experience an immediate and significant decline in our revenue and 
profitability and harm to our business.

Generally, our buyers and sellers are not obligated to provide us with any minimum volumes of business, may do business 

with our competitors as well as with us, may reduce or cancel their business with us without penalty, and may bypass us and transact 
directly with each other or through other intermediaries that compete with us. Accordingly, our business is highly vulnerable to 
changes in the macro environment, price competition, and development of new or more compelling offerings by our competitors, 
which could reduce business generally or motivate buyers or sellers to migrate to competitors' offerings. 

Sellers and buyers may seek to change the terms on which they do business with us, or allocate their advertising inventory or 

demand to our competitors who provide advertising demand and supply to them on more favorable terms or whose offerings are 
considered more beneficial. Supply of advertising inventory is also limited for some sellers, such as special sites or new 
technologies, and sellers may request higher prices, fixed price arrangements or guarantees that we cannot provide as effectively as 
our competitors, or that would reduce the profitability of that business. In addition, sellers sometimes place significant restrictions 
on the sale of their advertising inventory, such as strict security requirements, prohibitions on advertisements from specific 
advertisers or specific industries, and restrictions on the use of specified creative content or format. Finally, with the proliferation of 
header bidding, sellers' inventory is available for purchase through multiple exchanges simultaneously, thereby reducing the number 
of ad impressions sold through our exchange even where we have historically had relationships with the seller.

We serve many buyers and sellers, but certain large buyers and sellers have accounted for and will continue to account for a 
disproportionate share of business transacted through our solution. Although we no longer earn revenue directly from buyers, as we 
ceased charging buyer fees in late 2017, in 2018 there were two buyers of advertising inventory that indirectly contributed to 40% of 
revenue through their buying activity from sellers on our platform. Buyer and seller needs and plans can change quickly, and buyers 
or sellers may reduce volumes or terminate their arrangements with us, quickly and without penalty, for a variety of reasons, 
including financial issues or other changes in circumstances; development or acquisition by buyers or sellers of their own 
technologies that reduce their reliance upon us; the new offerings by or strategic relationships with our competitors; change or 
removal of personnel with whom we traditionally had relationships; opportunities for buyers and sellers to bypass us and deal 
directly with each other; change in control (including consolidations through mergers and acquisitions); adoption of header bidding 
solutions; or declining general economic conditions (including those resulting from dissolutions of companies). Technical issues 
affecting our systems or the systems of our larger buyers or sellers could also cause a decline in spending. As is typical in our 
industry, some of the largest buyers and sellers on our platform are also competitors, which could increase the risk that such 
companies could reduce their business with us. These factors make it important for us to expand and diversify our client 
relationships. The number of large media buyers and sellers in the market is finite, and it could be difficult for us to replace revenue 
loss from any large buyers or sellers whose relationships with us diminish or terminate. Just as growth in our inventory strengthens 
buyer activity in a network effect, loss of inventory or buyers could have the opposite effect. 

Because we do not have long-term contracts, our future revenue may be difficult to predict and there is no assurance that our 
current buyers and sellers will continue to use our solution or that we will be able to replace lost buyers or sellers with new ones. If 
a buyer or group of buyers representing a significant portion of the demand in our marketplace, or a seller or group of sellers 

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representing a significant portion of the inventory in our marketplace decides to materially reduce use of our solutions, it could 
cause an immediate and significant decline in our revenue and profitability and harm to our business. Additionally, if we 
overestimate future usage, we may incur additional expenses in adding infrastructure without a commensurate increase in revenue, 
which would harm our profitability and other operating results.

We must provide value to both buyers and sellers of advertising without being perceived as favoring one over the other or being 
perceived as competing with them through our service offerings.

Buyers and sellers have different interests, with each trying to enhance its value in their transactions through use of data, 

requests that we adapt our solution to help them, and other means. We are interposed between buyers and sellers, and to be 
successful, we must continue to find ways of providing value to both without being perceived as favoring one at the expense of the 
other. For example, our proprietary auction algorithms, which are designed to improve auction outcomes, influence the allocation 
and pricing of impressions and must do so in ways that add value to both buyers and sellers. Continued technological evolution in 
our business results in the availability and use of more data more incisively to inform buying and selling decisions. Third-party data 
analytics providers encourage this dynamic by offering products to buyers and sellers to attempt to swing transactional dynamics to 
their advantage at the expense of the other. We come under pressure to provide raw data to fuel these products and to facilitate their 
use by buyers and sellers on our platform. Unlike some competitors, who focus on serving either buyers or sellers, we must serve 
the interests of both, meaning that we must exercise caution in use of data and may determine not to facilitate some data products, 
which could result in loss of business from clients that insist upon using such products. Furthermore, because new business models 
continue to emerge, we must constantly adapt our relationship with buyers and sellers and how we market ourselves to each. 
Consistent with our goal of connecting buyers and sellers, we inevitably grow closer to each, and we must take care that our deeper 
connections with buyers, on the one hand, or sellers, on the other hand, do not come at the expense of the other's interests. For 
example, our decision to default to a first-price auction dynamic for all our header bidding auctions could be perceived by some 
buyers as serving the interests of sellers by increasing amounts paid for inventory, while some sellers could view our Estimated 
Market Rate service, which is designed to reduce buyers’ first price bids while maintaining their win rates, as favoring buyers and 
reducing sellers' revenue. In addition, as our own capabilities evolve, we may be perceived by clients, particularly buyers, as 
competing with them. If we fail to balance our clients' interests appropriately, our ability to provide a full suite of services and our 
growth prospects may be compromised.

We rely on buyers to use our solution to purchase advertising on behalf of advertisers. Such buyers may have or develop high-
risk credit profiles or pay slowly, which may result in credit risk to us or require additional working capital to fund our accounts 
payable. In addition, direct billing arrangements between buyers and sellers may result in unfavorable fee dynamics and 
increased working capital demands.

Generally, we invoice and collect from buyers the full purchase price for impressions they have purchased, retain our fees, 

and remit the balance to sellers. However, in some cases, we may be required or choose to pay sellers for impressions delivered 
before we have collected, or even if we are unable to collect, from the buyer of those impressions. There can be no assurances that 
we will not experience bad debt in the future, and write-offs for bad debt could have a materially negative effect on our results of 
operations for the periods in which the write-offs occur. In addition, we attempt to coordinate collections from our buyers so as to 
fund our payment obligations to our sellers. However, some buyers and sellers may require direct billing and collection 
arrangements between themselves, and some providers of header bidding wrappers or other downstream decisioning mechanisms in 
which we participate (such as Google EB) may control billing and collection for transactions we win through their platforms. When 
we collect from buyers and pay sellers, we are able to retain our fees from cash we collect before remitting balances to sellers. 
However, if we do not manage collections and payments, we will need to invoice clients for our fees, which may delay our 
collections and increase visibility and result in pressure for more transparent or lower fees. Further, growth and increased 
competitive pressure in the digital advertising industry is causing advertisers and buyers to become more demanding, resulting in 
overall increased focus by all industry participants on pricing, transparency, and cash and collection cycles. Some buyers have 
experienced financial pressures that have motivated them to slow the timing of their payments to us. If buyers slow their payments 
to us or our cash collections are significantly diminished as a result of these dynamics, our revenue and/or cash flow could be 
adversely affected and we may need to use working capital to fund our accounts payable pending collection from the buyers. This 
may result in additional costs and cause us to forgo or defer other more productive uses of that working capital.

Our sales efforts with buyers and sellers may require significant time and expense and may not yield the results we seek.

Attracting new buyers and sellers and increasing our business with existing buyers and sellers involves substantial time and 
expense, and we may not be successful in our efforts. We may spend substantial time and effort educating buyers and sellers about 
our offerings, including providing demonstrations and comparisons against other available solutions. This process can be costly and 
time-consuming, and is complicated by us having to spend time integrating our solution with software of buyers and sellers. 
Because our solution may be less familiar in some markets outside the United States, the time and expense involved with attracting, 
educating and integrating buyers and sellers in international markets may be even greater than in the United States. If we are not 

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successful in targeting, supporting and streamlining our sales processes, our ability to grow our business may be adversely affected. 
In addition, because of competitive market conditions and negotiating leverage enjoyed by large buyers and sellers, we are 
sometimes forced to choose between loss of business or contracting on terms that allocate more risk to us than we would prefer to 
accept.

We rely on buyers and sellers to abide by contractual requirements and relevant laws, rules, and regulations when using our 
solution, and legal claims or enforcement actions resulting from the actions of buyers or sellers could expose us to liabilities, 
damage our reputation, and be costly to defend.

The buyers and sellers engaging in transactions through our platform impose various requirements upon each other, and they 

and the underlying advertisers are subject to regulatory requirements by governments and standards bodies applicable to their 
activities. We assume responsibility for satisfying or facilitating the satisfaction of some of these requirements through the contracts 
we enter into with buyers and sellers. In addition, we may have responsibility for some acts or omissions of buyers or sellers 
transacting business through our solution under applicable laws or regulations or as a result of common law duties, even if we have 
not assumed responsibility contractually. These responsibilities could expose us to significant liabilities, perhaps without the ability 
to impose effective mitigating controls upon, or to recover from, buyers and sellers.

We contractually require our buyers and sellers to abide by relevant laws, rules and regulations, as well as restrictions by their 

counterparties, when transacting on our platform, and we generally attempt to obtain representations from buyers that the 
advertising they place through our solution complies with applicable laws and regulations and does not violate third-party 
intellectual property rights, and from sellers about the quality and characteristics of the impressions they provide. We also generally 
receive representations from buyers and sellers about their privacy practices and compliance with applicable laws and regulations, 
including their maintenance of adequate privacy policies that disclose and permit our data collection practices. Nonetheless, there 
are many circumstances in which it is difficult or impossible for us to monitor or evaluate their compliance. For example, we cannot 
control the content of buyers’ advertisements or sellers’ media properties, and we are often unable to determine exactly what 
information a buyer collects after an ad has been placed, and how the buyer uses any such collected information. If buyers or sellers 
fail to abide by relevant laws, rules and regulations, or contract requirements, when transacting over our platform, or after such a 
transaction is completed, we could potentially face liability for such misuse. Similarly, if such misconduct results in enforcement 
action by a regulatory body or other governmental authority, we could become involved in a potentially time-consuming and costly 
investigation or we could be subject to some form of sanction or penalty. We may not have adequate indemnity to protect us against, 
and our policies of insurance may not cover, such claims and losses.

Our business relationships expose us to risk of substantial liability for contract breach, violation of laws and regulations, 
intellectual property infringement and other losses, and our contractual indemnities and limitations of liability may not protect 
us adequately.

Our agreements with sellers, buyers and other third parties typically obligate us to provide indemnity and defense for losses 

resulting from claims of intellectual property infringement, damages to property or persons, business losses or other liabilities. 
Generally, these indemnity and defense obligations relate to our own business operations, obligations and acts or omissions. 
However, under some circumstances, we agree to indemnify and defend contract counterparties against losses resulting from their 
own business operations, obligations and acts or omissions, or the business operations, obligations and acts or omissions of third 
parties. For example, because our business interposes us between buyers and sellers in various ways, buyers often require us to 
indemnify them against acts and omissions of sellers, and sellers often require us to indemnify them against acts and omissions of 
buyers. In addition, our agreements with sellers, buyers and other third parties typically include provisions limiting our liability to 
the counterparty and the counterparty's liability to us. These limits sometimes do not apply to certain liabilities, including indemnity 
obligations. These indemnity and limitation of liability provisions generally survive termination or expiration of the agreements in 
which they appear.

We have limited ability to control acts and omissions of buyers and sellers or other third parties that could trigger our 
indemnity obligations, and our policies of insurance may not cover us for acts and omissions of others. Because we contract with 
many buyers and sellers and those contracts are individually negotiated with different scopes of indemnity and different limits of 
liability, it is possible that in any case our obligation to provide indemnity for the acts or omissions of a third party such as a buyer 
or seller may exceed what we are able to recover from that party. Further, contractual limits on our liability may not apply to our 
indemnity obligations, contractual limits on our counterparties' liability may limit what we can recover from them, and contract 
counterparties may be unable to meet their obligations to indemnify and defend us as a result of insolvency or other factors. Large 
indemnity obligations, or obligations to third parties not adequately covered by the indemnity obligations of our contract 
counterparties, could expose us to significant costs.

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In addition to the effects on indemnity described above, the limitation of liability provisions in our contracts may, depending 
upon the circumstances, be too high to protect us from significant liability for our own acts or omissions, or so low as to prevent us 
from recovering fully for the acts or omissions of our counterparties.

Our solution relies on third-party open source software components. Failure to comply with the terms of the underlying open 
source software licenses could expose us to liabilities, and the combination of certain open source software with code that we 
develop could compromise the proprietary nature of our solution.

Our solution utilizes software licensed to us by third-party authors under "open source" licenses. The use of open source 
software may entail greater risks than the use of third-party commercial software, as open source licensors generally do not provide 
warranties or other contractual protections regarding infringement claims or the quality of the code. Some open source licenses 
contain requirements that we make available source code for modifications or derivative works we create based upon the type of 
open source software we use. If we combine our proprietary software with open source software in a certain manner, we could, 
under certain open source licenses, be required to release the source code of our proprietary software to the public. This would allow 
our competitors to create similar solutions with lower development effort and time and ultimately put us at a competitive 
disadvantage.

The terms of many open source licenses have not been interpreted by U.S. courts, and there is a risk that these licenses could 

be construed in a way that could impose unanticipated conditions or restrictions on us. Moreover, we cannot guarantee that our 
processes for controlling our use of open source software will be effective. If we are held to have breached the terms of an open 
source software license, we could be required to seek licenses from third parties to continue operating using our solution on terms 
that are not economically feasible, to re-engineer our solution or the supporting computational infrastructure to discontinue use of 
certain code, or to make generally available, in source code form, portions of our proprietary code.

Risks Relating to Our Operations

Our reorganization and cost-control efforts might not assure profitability and may affect morale and make it difficult to retain 
employees or attract new ones.

  We implemented a reduction in force affecting approximately 125 employees in November 2016 and, in the first quarter of 

2017, we exited the intent marketing business and reorganized our management team. These steps were part of a larger effort we 
began earlier in 2016 to realign our business to address the needs of our clients and the evolving marketplace in which we operate, 
and to pursue our strategic priorities. Our strategic decisions to reduce and then eliminate our buyer fees contributed to a significant 
decline in our revenue and cash flow, which compelled us to pursue additional cost-reduction measures in 2018 in an ongoing effort 
to operate profitably; we implemented further headcount reductions of approximately 100 employees in the first quarter of 2018. We 
had previously scaled our organization in anticipation of continuing revenue growth in excess of the actual results we achieved, and 
the steps we took were intended to reduce our costs to align our organization and cost structure more appropriately to our current 
revenue and scale and to position us better to expand our investments in future growth areas including header bidding, mobile, 
video, and PMP. However, our cost reduction efforts do not assure our profitability. Additional cost reductions may be implemented 
in the future, and cost savings may be offset by future hiring or other costs to pursue strategic objectives. The reductions in force 
and management reorganization could adversely affect morale in our organization and our reputation as an employer, which could 
lead to the loss of valued employees and could make it more difficult for us to hire new employees in the future, and the reduction 
of our headcount could adversely affect our service delivery and make it more difficult for us to pursue new opportunities and 
initiatives in the future. The reduction in force, including our sales staff, also may make it difficult for us to execute on our strategy 
of increasing the amount of volume on our platform 

Real or perceived errors or failures in the operation of our solution could damage our reputation and impair our sales.

We must operate our technology infrastructure without interruption to support the needs of sellers and buyers. Because our 

software is complex, undetected errors and failures may occur, especially when new versions or updates are made to our software or 
network infrastructure or changes are made to sellers' or buyers' software interfacing with our solution. Errors or bugs in our 
software, faulty algorithms, technical or infrastructure problems, or updates to our systems could lead to an inability to effect 
transactions or process data to place advertisements or price inventory effectively, cause the inadvertent disclosure of proprietary 
data, or cause advertisements to display improperly or be placed in proximity to inappropriate content. Errors or bugs in our 
software have in the past, and may in the future, not be found until the software is in our live operating environment. For example, 
changes to our solution have in the past caused errors in the reporting and analytics applications for buyers, resulting in delays in 
their spending on our platform. Errors or failures in our solution, even if caused by the implementation of changes by buyers or 
sellers to their systems, could also result in negative publicity, disclosure of confidential information, damage to our reputation, loss 
of or delay in market acceptance of our solution, increased costs or loss of revenue, loss of competitive position, or claims by 
advertisers for losses sustained by them.

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We may make errors in the measurement of transactions conducted through our solution, causing discrepancies with the 

measurements of buyers and sellers, which can lead to a lack of confidence in us and require us to reduce our fees or provide 
refunds to buyers and sellers. Alleviating problems resulting from errors in our software could require significant expenditures of 
capital and other resources and could cause interruptions, delays, or the cessation of our business.

Various risks could interrupt access to our network infrastructure or data, exposing us to significant costs and other liabilities.

Our revenue depends on the technological ability of our solution to deliver and measure advertising impressions, and the 

operation of our exchange and our ability to place impressions depend on the continuing and uninterrupted performance of our IT 
systems. Our platform operates on our data processing equipment that is housed in third-party commercial data centers that we do 
not control or on servers owned and operated by cloud-based service providers, which may leave us vulnerable to technical issues or 
outages that we cannot easily control or remedy. In addition, our systems interact with systems of buyers and sellers and their 
contractors. All of these facilities and systems are vulnerable to interruption and/or damage from a number of sources, many of 
which are beyond our control, including, without limitation: (i) loss of adequate power or cooling and telecommunications failures; 
(ii) fire, flood, earthquake, hurricane, and other natural disasters; (iii) software and hardware errors, failures, or crashes;
(iv) financial insolvency; and (v) computer viruses, malware, hacking, terrorism, and similar disruptive problems. In particular,
intentional cyber-attacks present a serious issue because they are difficult to prevent and remediate and can be used to defraud our
buyers and sellers and their clients and to steal confidential or proprietary data from us, our clients, or their users. Further, because
our Los Angeles headquarters and San Francisco offices and our California data center sites are in seismically active areas,
earthquakes present a particularly serious risk of business disruption. These vulnerabilities may increase with the complexity and
scope of our systems and their interactions with buyer and seller systems.

The steps we take to mitigate this risk may not protect against all problems, and our ability to mitigate risks to related third-

party systems is limited. In addition, we rely to a significant degree upon security and business continuity measures of our data 
center operators, which may be ineffective. Our disaster recovery and business continuity plans rely upon third-party providers of 
related services, and if those vendors fail us, we could be unable to meet the needs of buyers and sellers. Any steps we take to 
increase the reliability and redundancy of our systems may be expensive and may not be successful in preventing system failures. 
Any failures with our solution or delays in the execution of transactions through our system may result in the loss of advertising 
placements on impressions and, as a result, the loss of revenue. Our facilities would be costly to repair or replace, and any such 
efforts would likely require substantial time.

Buyers may attribute to us any technical disruption or failure in the performance of advertisements on sellers' digital media 

properties, harming our reputation and resulting in buyers seeking to avoid payment or demand future credits for disruptions or 
failures. If we are unable to operate our exchange and deliver advertising impressions successfully, our ability to attract potential 
buyers and sellers and retain and expand business with existing buyers and sellers could be harmed.

Malfunction or failure of our systems, or other systems that interact with our systems, or inaccessibility or corruption of data, 

could disrupt our operations and negatively affect our business and results of operations to a level in excess of any applicable 
business interruption insurance, result in potential liability to buyers and sellers, and negatively affect our reputation and ability to 
sell our solution.

Any breach of our computer systems or confidential data in our possession could expose us to significant expense and liabilities 
and harm our reputation.

We maintain our own confidential and proprietary information in our IT systems, and we control or have access to 

confidential, proprietary, and personal data belonging or related to buyers, sellers, and their clients and users, as well as vendors and 
business partners. Our clients and various third parties also have access to our confidential and proprietary information. There is no 
guarantee that inadvertent or unauthorized use or disclosure will not occur or that third parties will not gain unauthorized access to 
this data despite our efforts to protect this data.

We are subject to ongoing security threats and breaches, computer malware, computer hacking attacks, and inadvertent 
transmission of computer viruses, which continue to increase in sophistication. Other harmful software code may occur on our 
systems or those of our clients, business partners, or information technology vendors. Security measures undertaken by us, our 
vendors, and our buyers and sellers may be ineffective as a result of employee error, failure to implement appropriate processes and 
procedures, malfeasance, cyber-attacks, cyber-extortion or other intentional misconduct by computer hackers, "phishing" or other 
tactics to obtain illicit system access, or otherwise. Because techniques used to obtain unauthorized access or sabotage systems 
change frequently and generally are not identified until they are launched against a target, and because we typically are not able to 
control the efficacy of security measures implemented by our clients and vendors, we may be unable to anticipate these techniques 
or to implement adequate preventative or mitigation measures.

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Though it is difficult to determine what harm may directly result from any specific interruption or breach, any security 

incident could disrupt computer systems or networks, interfere with services to our sellers, buyers, or their clients, and result in 
unauthorized access to personally identifiable information, intellectual property, and other confidential business information owned 
by us or our buyers, sellers, or vendors. As a result, we could be exposed to legal claims and litigation, indemnity obligations, 
regulatory fines and penalties, contractual obligations, other liabilities, significant costs for remediation and re-engineering to 
prevent future occurrences, significant distraction to our business, and damage to our reputation, our relationships with buyers and 
sellers, and our ability to retain and attract new buyers and sellers. If personally identifiable information is compromised, we may be 
required to undertake notification and remediation procedures, provide indemnity, and undergo regulatory investigations and 
penalties, all of which can be extremely costly and result in adverse publicity.

Failure to maintain the brand security features of our solution could harm our reputation and expose us to liabilities.

It is important to sellers that the advertising placed on their media not conflict with existing seller arrangements and be of 

high quality, consistent with applicable seller standards and compliant with applicable legal and regulatory requirements. It is 
important to buyers that their advertisements are placed on appropriate media, in proximity with appropriate content, that the 
impressions for which they are charged are legitimate, and that their advertising campaigns yield their desired results. We use 
various measures, including proprietary technology, in an effort to store, manage and process rules set by buyers and sellers and to 
ensure the quality and integrity of the results delivered to sellers and buyers through our solution. If we fail to properly implement 
or honor rules established by buyers and sellers, or if our measures are not adequate, advertisements may be improperly placed 
through our platform, which can result in harm to our reputation as well as the need to pay refunds and other potential legal 
liabilities.

Failure to detect or prevent fraud, intrusion of malware through our platform into the systems or devices of our clients and their 
customers, or other actions that impact the integrity of our solution or advertisement performance, could cause sellers and 
buyers to lose confidence in our solution and expose us to legal claims, which would cause our business to suffer. If we 
terminate relationships with sellers as a result of our screening efforts, our volume of paid impressions may decline.

We have in the past, and may in the future, be subject to fraudulent and malicious activities undertaken by persons seeking to 

use our platform for improper purposes, including to divert or artificially inflate purchases by buyers through our platform, or to 
disrupt or divert the operation of the systems and devices of our clients and their customers to misappropriate information, generate 
fraudulent billings, stage hostile attacks, or for other illicit purposes. Examples of such activities include the use of bots or other 
automated or manual mechanisms to generate fraudulent impressions that are delivered through our platform, which could overstate 
the performance of advertising impressions. Such activities could also include the introduction of malware through our platform by 
persons seeking to commandeer, or gain access to information on, consumers' devices. We use proprietary technology to identify 
non-human inventory and traffic, as well as malware, and we generally terminate relationships with parties that appear to be 
engaging in such activities, which may result in fewer paid impressions in the year the relationships are terminated than would have 
otherwise occurred. Despite our efforts, it can be difficult to detect fraudulent or malicious activity for various reasons. We do not 
own content and must rely in part on sellers and buyers for controls with respect to such activity. Perpetrators of fraudulent 
impressions and malware can be ingenious and change their tactics to adapt to preventative measures, requiring us to improve over 
time our processes for assessing the quality of sellers' inventory and controlling fraudulent activity. We may be restricted from 
employing certain anti-fraud detection technology. Fraudulent activity is more difficult for us to detect and police in inventory we 
access through third-party aggregators, because in those situations we do not connect directly to the publishers and their servers. We 
plan to increase our reliance on this type of inventory as part of our strategy to increase the volume of transactions on our platform, 
which could expose us to increased risk of fraudulent activity. If we fail to detect or prevent fraudulent or other malicious activity, 
we could face legal claims from clients and/or consumers and the affected advertisers may experience or perceive a reduced return 
on their investment or heightened risk associated with use of our solution, resulting in dissatisfaction with our solution, refusals to 
pay, refund demands, loss of confidence of buyers or sellers, or withdrawal of future business.

We are relying upon the ad classification technology we acquired from nToggle to help us increase the scale of our business and 
compete for demand. 

In July 2017, we purchased nToggle, which had developed ad classification and filtering technology. Our plan is to use the 
technology to filter bidstream data to help our buyers more efficiently identify and purchase the inventory they are looking for, help 
our sellers monetize their inventory, and enable us to process ad requests more efficiently and achieve higher fill rates. As such, it is 
an important part of our strategic plans and is critical to our ability to increase the volume of transactional activity on our exchange 
significantly and in a cost-effective manner. We have invested substantially in continued development of the technology and the 
rollout of the classification and filtering capabilities to all of our buyers globally. The current version of the technology is designed 
to eliminate low-value traffic for each buyer, and increase the proportion of traffic that each buyer finds valuable, with the result that 
our traffic will be more valuable to our buyers than what they see from other exchanges. The technology requires additional 
development and its ongoing integration into our platform and implementation of the technology at scale in our services to our 

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clients will continue to require significant efforts. We may need to allocate more resources to integration and product development 
activities than originally anticipated, and these efforts may increase the short-term cost of the deployment until we can more tightly 
integrate the features into our core platform. While we believe that the technology will give us a significant advantage in filtering 
capabilities over our competitors, some of our competitors are larger and better funded than we are, can devote more resources to 
development of technologies like filtering than we can, and thus might develop similar or better capabilities faster than we can. We 
intend to provide nToggle’s technology to our DSPs without charging separately for it, so we do not currently expect to generate 
revenue directly from sale of filtering services based upon nToggle’s technology. Instead, we plan to rely upon positive effects from 
integration of nToggle’s technology into our operations, as described above, to recover our investment in the acquisition and help us 
return to growth and positive cash flow. However, the results we expect from the nToggle technology might not materialize, and we 
may not be able to recoup our investment in the technology, potentially resulting in adverse effects on our strategic plans and 
negative effects on our results of operations, cash flows, and financial condition from acquisition-related charges, amortization of 
intangible assets and asset impairment charges. 

Any acquisitions we undertake may disrupt our business, adversely affect operations, dilute stockholders, and expose us to costs 
and liabilities.

Acquisitions have been an important element of our business strategy, and we may pursue future acquisitions in an effort to 

increase revenue, expand our market position, add to our service offering and technological capabilities, respond to dynamic market 
conditions, or for other strategic or financial purposes. However, there is no assurance that we will identify suitable acquisition 
candidates or complete any acquisitions on favorable terms, or at all. Further, any acquisitions we do complete would involve a 
number of risks, including the following:

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The identification, acquisition, and integration of acquired businesses require substantial attention from
management. The diversion of management's attention and any difficulties encountered in the transition process
could hurt our business.

The identification, acquisition, and integration of acquired businesses requires significant investment, including to
determine which new service offerings we might wish to acquire, harmonize service offerings, expand management
capabilities and market presence, and improve or increase development efforts and technology features and
functions.

The anticipated benefits from the acquisition may not be achieved, including as a result of loss of clients or
personnel of the target, other difficulties in supporting and transitioning the target's clients, the inability to realize
expected synergies from an acquisition, or negative culture effects arising from the integration of new personnel.

We may face difficulties in integrating the personnel, technologies, solutions, operations, and existing contracts of
the acquired business.

We may fail to identify all of the problems, liabilities or other shortcomings or challenges of an acquired company,
technology, or solution, including issues related to intellectual property, solution quality or architecture, income tax
and other regulatory compliance practices, revenue recognition or other accounting practices, or employee or client
issues.

To pay for future acquisitions, we could issue additional shares of our common stock or pay cash. Issuance of shares
would dilute stockholders. Use of cash reserves could diminish our ability to respond to other opportunities or
challenges. Borrowing to fund any cash purchase price would result in increased fixed obligations and could also
include covenants or other restrictions that would impair our ability to manage our operations.

Acquisitions expose us to the risk of assumed known and unknown liabilities including contract, tax, and other
obligations incurred by the acquired business or fines or penalties, for which indemnity obligations, escrow
arrangements or insurance may not be available or may not be sufficient to provide coverage.

New business acquisitions can generate significant intangible assets that result in substantial related amortization
charges and possible impairments.

The operations of acquired businesses, or our adaptation of those operations, may require that we apply revenue
recognition or other accounting methodologies, assumptions, and estimates that are different from those we use in
our current business, which could complicate our financial statements, expose us to additional accounting and audit
costs, and increase the risk of accounting errors.

Acquired businesses may have insufficient internal controls that we must remediate, and the integration of acquired
businesses may require us to modify or enhance our own internal controls, in each case resulting in increased
administrative expense and risk that we fail to comply with the requirements of Section 404 of the Sarbanes-Oxley
Act of 2002.

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Acquisition of businesses based outside the United States would require us to operate in foreign languages and
manage non-U.S. currency, billing, and contracting needs, comply with laws and regulations, including labor laws
and privacy laws that in some cases may be more restrictive on our operations than laws applicable to our business
in the United States.

Acquisitions can sometimes lead to disputes with the former owners of the acquired company, which can result in
increased legal expenses, management distraction and the risk that we may suffer an adverse judgment if we are not
the prevailing party in the dispute.

The purchase price allocation for any acquisition we complete is generally not finalized until well after the closing
of the acquisition, and any final adjustment to the valuation could change the fair values assigned to the assets and
liabilities, resulting in a change to our consolidated financial statements, including a change to goodwill. Such
change could be material.

If we fail to attract, motivate, train, and retain highly qualified engineering, marketing, sales and management personnel, our 
ability to execute our business strategy could be impaired.

We are a technology-driven company and it is imperative that we have highly skilled mathematicians, computer scientists, 
engineers and engineering management to innovate and deliver our complex solutions. Increasing our base of buyers and sellers 
depends to a significant extent on our ability to expand our sales and marketing operations and activities, and our solution requires a 
sophisticated sales force with specific sales skills and specialized technical knowledge that takes time to develop. Appropriately 
qualified personnel can be difficult to recruit and retain. In addition, in international markets, we encounter staffing challenges that 
are unique to a particular country or region, such as recruiting and retaining qualified personnel in foreign countries and difficulty 
managing such personnel and integrating them into our culture. In particular, it may be difficult to find qualified sales personnel in 
international markets, or sales personnel with experience in emerging segments of the market. Skilled and experienced management 
is critical to our ability to achieve revenue growth, execute against our strategic vision and maintain our performance through the 
growth and change we anticipate. 

Our success depends significantly upon our ability to recruit, train, motivate, and retain key technology, engineering, sales, 

and management personnel, and competition for employees with experience in our industry can be intense, particularly in 
California, New York and London, where our operations and the operations of other digital media companies are concentrated and 
where other technology companies compete for management and engineering talent. Other employers may be able to provide better 
compensation, more diverse opportunities and better chances for career advancement. These challenges could become more acute 
for us because our revenue and cash flow declines may contribute to concerns about our stability, and the decline we have 
experienced in the market value of our common stock reduces the perceived value of the equity compensation we offer and has left 
the stock options previously issued to our employees largely out of the money. Similarly, it may be difficult for us to recruit, train, 
motivate, and retain key technology, engineering, sales, and management personnel in light of the recent headcount reductions we 
have undertaken. None of our officers or other key employees have an employment agreement for a specific term, and any of such 
individuals may terminate his or her employment with us at any time.

It can be difficult, time-consuming, and expensive to recruit personnel with the combination of skills and attributes required 

to execute our business strategy, and we may be unable to hire or retain sufficient numbers of qualified individuals in the markets 
where we do business or plan to do business. New hires require significant training and it may take significant time (often six 
months or more) before they achieve full productivity. As a result, we may incur significant costs to attract and retain employees, 
including significant expenditures related to salaries and benefits and compensation expenses related to equity awards before new 
hires contribute to sales or productivity, and we may lose new employees to our competitors or other companies before we realize 
the benefit of our investment in recruiting and training. Moreover, new employees may not be or become as productive as we 
expect, and we may face challenges in adequately or appropriately integrating them into our workforce and culture. At times we 
have experienced elevated levels of unwanted attrition, and as our organization grows and changes and competition for talent 
increases, this type of attrition may increase.

Our proprietary rights may be difficult to enforce, which could enable others to copy or use aspects of our solution without 
compensating us, thereby eroding our competitive advantages and harming our business.

Our success depends, in part, on our ability to protect proprietary methods and technologies that we develop or otherwise 

acquire, so that we can prevent others from using our inventions and proprietary information. Establishing trade secret, copyright, 
trademark, domain name, and patent protection is difficult and expensive. We rely on trademark, copyright, trade secret laws, 
confidentiality procedures and contractual provisions to protect our proprietary methods and technologies. Our patent program is 
relatively small, and while we have some issued patents and pending patent applications, valid patents may not be issued from our 
pending applications or we may choose to abandon applications, and the claims of our issued patents or the claims eventually 
allowed on any pending applications may not be sufficiently broad to protect our technology or offerings and services. Any issued 

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patents may be challenged, invalidated or circumvented, and any rights granted under these patents may not actually provide 
adequate defensive protection or competitive advantages to us. Additionally, the process of obtaining patent protection is expensive, 
time-consuming, and uncertain, and we may not be able to prosecute all necessary or desirable patent applications to successful 
conclusion at a reasonable cost or in a timely manner. Accordingly, despite our efforts, we may be unable to obtain adequate patent 
protection, or to prevent third parties from infringing upon or misappropriating our intellectual property.

Unauthorized parties may attempt to copy aspects of our technology or obtain and use information that we regard as 
proprietary, and the steps we take to protect our proprietary information may not prevent misappropriation of our technology and 
proprietary information or infringement of our intellectual property rights. Policing unauthorized use of our technology and 
intellectual property is difficult. We may be required to protect our intellectual property in an increasing number of jurisdictions, a 
process that is expensive and may not be successful or which we may not pursue in every location. Our competitors and others 
could attempt to capitalize on our brand recognition by using domain names or business names similar to ours, and we may be 
unable to prevent third parties from acquiring or using domain names and other trademarks that infringe on, are similar to, or 
otherwise decrease the value of our brands, trademarks or service marks. In addition, the laws of some foreign countries may not be 
as protective of intellectual property rights as those of the United States, and mechanisms for enforcement of our proprietary rights 
in such countries may be inadequate. It may be possible for unauthorized third parties to copy or reverse engineer aspects of our 
technology or otherwise obtain and use information that we regard as proprietary, or to develop technologies similar or superior to 
our technology or design around our proprietary rights, despite the steps we have taken to protect our proprietary rights.

From time to time, we may take legal action to enforce our intellectual property rights, protect our trade secrets, determine 
the validity and scope of the proprietary rights of others, or defend against claims of infringement. Such litigation could result in 
substantial costs and the diversion of limited resources, and might not be successful. If we are unable to protect our proprietary 
rights (including aspects of our technology solution) we may find ourselves at a competitive disadvantage.

We may be subject to intellectual property rights claims by third parties, which are costly to defend, could require us to pay 
significant damages and could limit our ability to use certain technologies and intellectual property.

Third parties may assert claims of infringement or misappropriation of intellectual property rights against us or buyers, 

sellers, or third parties with which we work; we cannot be certain that we are not infringing any third-party intellectual property 
rights, and we may have liability or indemnification obligations as a result of such claims. As a result of the information disclosure 
in required public company filings our business and financial condition are visible, which may result in threatened or actual 
litigation, including by competitors and other third parties.

Regardless of whether claims that we are infringing patents or infringing or misappropriating other intellectual property 

rights have any merit, these claims are time-consuming and costly to evaluate and defend, and can impose a significant burden on 
management and employees. The outcome of any claim is inherently uncertain, and we may receive unfavorable interim or 
preliminary rulings in the course of litigation. There can be no assurances that favorable final outcomes will be obtained in all cases. 
We may decide to settle lawsuits and disputes on terms that are unfavorable to us. Some of our competitors have substantially 
greater resources than we do and are able to sustain the costs of complex intellectual property litigation to a greater degree and for 
longer periods of time than we could.

Although third parties may offer a license to their technology or intellectual property, the terms of any offered license may 

not be acceptable and the failure to obtain a license or the costs associated with any license could cause our business, results of 
operations or financial condition to be materially and adversely affected. In addition, some licenses may be non-exclusive, and 
therefore our competitors may have access to the same technology or intellectual property licensed to us. Alternatively, we may be 
required to develop non-infringing technology or to make other changes, such as to our branding, which could require significant 
effort and expense and ultimately may not be successful. Furthermore, a successful claimant could secure a judgment or we may 
agree to a settlement that prevents us from distributing certain products or performing certain services or that requires us to pay 
substantial damages, including treble damages if we are found to have willfully infringed such claimant's patents or copyrights. 
Claims of intellectual property infringement or misappropriation also could result in injunctive relief against us, or otherwise result 
in delays or stoppages in providing all or certain aspects of our solution.

We are subject to government regulations concerning our employees, including wage-hour laws and taxes.

We are subject to applicable rules and regulations relating to our relationship with our employees, including health benefits, 
sick days, unemployment and similar taxes, overtime and working conditions, equal pay, immigration status, and classification of 
employee benefits for tax purposes. Legislated increases in labor cost components, such as employee benefit costs, workers' 
compensation insurance rates, compliance costs and fines, as well as the cost of litigation in connection with these regulations, 
would increase our labor costs. Many employers nationally have been subject to actions brought by governmental agencies and 
private individuals under wage-hour laws on a variety of claims, such as improper classification of workers as exempt from 

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overtime pay requirements, failure to pay overtime wages properly, and failure to provide meal and rest breaks or pay for missed 
breaks, with such actions sometimes brought as class actions, and these actions can result in material liabilities and expenses. 
Federal and state standards for classifying employees under wage-hour laws differ and are often unclear or require application of 
judgment, and classification may need to be changed as employment duties evolve over time. We may mis-classify employees and 
be subject to liability as a result. Employment rules and regulations change rapidly, often as a result of macro trends, such as the 
#metoo movement, and we may not be able to adapt our practices in time to meet new regulatory obligations. If we become subject 
to employment litigation, such as actions involving wage-hour, overtime, break and working time, discrimination or relation, it may 
distract our management from business matters and result in increased labor costs.

Risks Related to Our International Business Strategy

Our international operations require increased expenditures and impose additional risks and compliance imperatives, and 
failure to successfully execute our international plans will adversely affect our growth and operating results.

We have numerous operations outside of North America, in Northern and Southern Europe, Australia, Japan, Singapore, and 

Brazil, and achievement of our international objectives will require a significant amount of attention from our management, finance, 
legal, analytics, operations, sales, and engineering teams, as well as significant investment in developing the technology 
infrastructure necessary to deliver our solution and maintain sales, delivery, support, and administrative capabilities in the countries 
where we operate. Attracting new buyers and sellers outside the United States may require more time and expense than in the United 
States, in part due to language barriers and the need to educate such buyers and sellers about our solution, and we may not be 
successful in establishing and maintaining these relationships. The data center and telecommunications infrastructure in some 
overseas markets may not be as reliable as in North America and Europe, which could disrupt our operations. In addition, our 
international operations will require us to develop and administer our internal controls and legal and compliance practices in 
countries with different cultural norms, languages, currencies, legal requirements, and business practices than the United States.

International operations also impose risks and challenges in addition to those faced in the United States, including 

management of a distributed workforce; the need to adapt our offering to satisfy local requirements and standards (including 
differing privacy policies and labor laws that are sometimes more stringent); laws and business practices that may favor local 
competitors; legal requirements or business expectations that agreements be drafted and negotiated in the local language and 
disputes be resolved in local courts according to local laws; the need to enable transactions in local currencies; longer accounts 
receivable payment cycles and other collection difficulties; the effect of global and regional recessions and economic and political 
instability; potentially adverse tax consequences in the United States and abroad; staffing challenges, including difficulty in 
recruiting and retaining qualified personnel as well as managing such a diversity in personnel; reduced or ineffective protection of 
our intellectual property rights in some countries; and costs and restrictions affecting the repatriation of funds to the United States.

One or more of these requirements and risks may make our international operations more difficult and expensive or less 

successful than we expect, and may preclude us from operating in some markets. There is no assurance that our international 
expansion efforts will be successful, and we may not generate sufficient revenue or margins from our international business to cover 
our expenses or contribute to our growth.

Operating in multiple countries requires us to comply with different legal and regulatory requirements.

Our international operations subject us to laws and regulations of multiple jurisdictions, as well as U.S. laws governing 
international operations, which are often evolving and sometimes conflict. For example, the Foreign Corrupt Practices Act, or 
FCPA, and comparable foreign laws and regulations (including the U.K. Bribery Act) prohibit improper payments or offers of 
payments to foreign governments and their officials and political parties by U.S. and other business entities for the purpose of 
obtaining or retaining business. Other laws and regulations prohibit bribery of private parties and other forms of corruption. As we 
expand our international operations, there is some risk of unauthorized payment or offers of payment or other inappropriate conduct 
by one of our employees, consultants, agents, or other contractors, including by persons engaged or employed by a business we 
acquire, which could result in violation by us of various laws, including the FCPA. Safeguards we implement to discourage these 
practices may prove to be ineffective and violations of the FCPA and other laws may result in severe criminal or civil sanctions, or 
other liabilities or proceedings against us, including class action lawsuits and enforcement actions from the SEC, Department of 
Justice, and foreign regulators. Other laws applicable to our international business include local employment, tax, privacy, data 
security, and intellectual property protection laws and regulations, including restrictions on movement of information about 
individuals beyond national borders. In particular, as explained in more detail elsewhere in this report, the GDPR imposes 
substantial compliance obligations and increases the risks associated with collection and processing of personal data. In some cases, 
buyers and sellers operating in non-U.S. markets may impose additional requirements on our non-U.S. business in efforts to comply 
with their interpretation of their own or our legal obligations. These requirements may differ significantly from the requirements 
applicable to our business in the United States and may require engineering, infrastructure and other costly resources to 
accommodate, and may result in decreased operational efficiencies and performance. As these laws continue to evolve and we 

43

expand to more jurisdictions or acquire new businesses, compliance will become more complex and expensive, and the risk of non-
compliance will increase.

Compliance with complex foreign and U.S. laws and regulations that apply to our international operations increases our cost 
of doing business abroad, and violation of these laws or regulations may interfere with our ability to offer our solution competitively 
in one or more countries, expose us or our employees to fines and penalties, and result in the limitation or prohibition of our conduct 
of business.

We are subject to governmental export and import controls that could subject us to liability or impair our ability to compete in 
international markets.

Our operations are subject to U.S. export controls, specifically the Export Administration Regulations and economic 
sanctions enforced by the Office of Foreign Assets Control. These regulations limit and control export of encryption technology. 
Furthermore, U.S. export control laws and economic sanctions prohibit the shipment of certain products and services to countries, 
governments, and persons targeted by U.S. sanctions. We incorporate encryption technology into the servers that operate our 
solution. As a result of locating some servers in data centers outside of the United States, we must comply with these export control 
laws.

In addition, various countries regulate the import of certain encryption technology and have enacted laws that could limit our 

ability to deploy our technology or our clients' ability to use our solution in those countries. Changes in our technology or changes 
in export and import regulations may delay introduction of our solution or the deployment of our technology in international 
markets, prevent our clients with international operations from using our solution globally or, in some cases, prevent the export or 
import of our technology to certain countries, governments, or persons altogether. Any change in export or import regulations, 
economic sanctions or related legislation, shift in the enforcement or scope of existing regulations, or change in the countries, 
governments, persons, or technologies targeted by such regulations, could result in decreased use of our solution by, or in our 
decreased ability to export our technology to, international markets.

Fluctuations in the exchange rates of foreign currencies could result in currency transaction losses.

We currently have transactions denominated in various non-U.S. currencies, and may, in the future, have sales denominated 

in the currencies of additional countries. In addition, we incur a portion of our expenses in non-U.S. currencies, and to the extent we 
need to convert currency to pay expenses, we are exposed to potentially unfavorable changes in exchange rates and added 
transaction costs. International transactions may be subject to unexpected regulatory requirements and other barriers. Any 
fluctuation in relevant currency exchange rates may negatively impact our business, financial condition and results of operations. 
We have not previously engaged in foreign currency hedging, and any effort to hedge our foreign currency exposure may not be 
effective due to lack of experience, unreasonable costs or illiquid markets. In addition, hedging may not protect against all foreign 
currency fluctuations and can result in losses.

Risks Related to Our Internal Controls and Finances

Failure to maintain effective internal controls could cause our investors to lose confidence in us and adversely affect the market 
price of our common stock. If our internal controls are not effective, we may not be able to accurately report our financial 
results or prevent fraud.

Section 404 of the Sarbanes-Oxley Act of 2002 requires that we maintain internal control over financial reporting that meets 

applicable standards and report on the effectiveness of our internal controls over financial reporting and any material weaknesses we 
identify. When we are no longer an "emerging growth company," we will also need to provide a statement that our independent 
registered public accounting firm has issued an opinion on our internal control over financial reporting.

We may err in the design or operation of our controls, and all internal control systems, no matter how well designed and 

operated, can provide only reasonable assurance that the objectives of the control system are met. Because there are inherent 
limitations in all control systems, there can be no absolute assurance that all control issues have been or will be detected. We 
previously identified certain material weaknesses in our internal controls which were remediated during 2014. However, completion 
of remediation does not provide assurance that our remediated controls will continue to operate properly or that our financial 
statements will be free from error. There may be undetected material weaknesses in our internal control over financial reporting, as a 
result of which we may not detect financial statement errors on a timely basis. Moreover, in the future we may implement new 
offerings and engage in business transactions, such as acquisitions, reorganizations, or implementation of new information systems 
that could require us to develop and implement new controls and could negatively affect our internal control over financial reporting 
and result in material weaknesses.

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If we identify new material weaknesses in our internal control over financial reporting, if we are unable to comply with the 

requirements of Section 404 in a timely manner, or, once required, if our independent registered public accounting firm is unable to 
express an opinion as to the effectiveness of our internal control over financial reporting, we may be unable, or be perceived as 
unable, to produce timely and reliable financial reports, investors may lose confidence in the accuracy and completeness of our 
financial reports, and the market price of our common stock could be negatively affected. As a result of such failures, we could also 
become subject to investigations by the stock exchange on which our securities are listed, the SEC, or other regulatory authorities, 
and become subject to litigation from investors and stockholders, which could harm our reputation, financial condition, or divert 
financial and management resources from our core business.

Our accounting is complex, and relies upon estimates or judgments relating to our critical accounting policies. If our accounting 
is erroneous or based on assumptions that change or prove to be incorrect, our operating results could fall below the 
expectations of securities analysts and investors, resulting in a decline in our stock price.

The preparation of financial statements in conformity with generally accepted accounting principles in the United States, or 

GAAP, requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial 
statements and accompanying notes, and also to comply with many complex requirements and standards. Various factors contribute 
to complexity in our accounting. For example, the recognition of our revenue is governed by certain criteria that determine whether 
we report revenue either on a gross basis, as a principal, or net basis, as an agent, depending upon the nature of the sales transaction. 
We have generally reported our revenue on a net basis because we are not the principal in our open market and orders transactions 
as conducted to date. However, from April 2015 through January 2017, we conducted an intent marketing business that included 
transactions reported on a gross basis, resulting in higher GAAP revenue and lower GAAP margins on a particular amount of 
advertising spend than for an equivalent level of advertising spend for which we report revenue on a net basis. We may have gross 
reporting for portions of our revenue in the future as a result of the evolution of our existing business practices, development of new 
products, acquisitions, or changes in accounting standards or interpretations, that in any case result in transactions with 
characteristics that dictate gross reporting. It is also possible that revenue reporting for existing business may change from gross to 
net or vice versa as a result of changes in contract terms or transaction mechanics. We may experience significant fluctuations in 
revenue in future periods depending upon, in part, the nature of our sales and our reporting of such revenue and related accounting 
treatment, without proportionate correlation to our underlying activity or net income. Any combination of net and gross revenue 
reporting would require us to make estimates and assumptions about the mix of gross and net-reported transactions based upon the 
volumes and characteristics of the transactions we think will make up the total mix of revenue in the period covered by the 
projection. Those estimates and assumptions may be inaccurate when made, or may be rendered inaccurate by subsequent 
circumstances, such as changing the characteristics of our offerings or particular transactions in response to client demands, market 
developments, regulatory pressures, acquisitions, and other factors. Even apparently minor changes in transaction terms from those 
initially envisioned can result in different accounting conclusions from those foreseen. In addition, we may incorrectly extrapolate 
from revenue recognition treatment of prior transactions to future transactions that we believe are similar, but that ultimately are 
determined to have different characteristics that dictate different revenue reporting treatment. These factors may make our financial 
reporting more complex and difficult for investors to understand, may make comparison of our results of operations to prior periods 
or other companies more difficult, may make it more difficult for us to give accurate guidance, and could increase the potential for 
reporting errors.

Further, our acquisitions have imposed purchase accounting requirements, required us to integrate accounting personnel, 
systems, and processes, necessitated various consolidation and elimination adjustments, and imposed additional filing and audit 
requirements. Ongoing evolution of our business, and any future acquisitions, will compound these complexities. Our operating 
results may be adversely affected if we make accounting errors or our judgments prove to be wrong, assumptions change or actual 
circumstances differ from those in our assumptions, or acquired assets become impaired, which could cause our operating results to 
fall below the expectations of securities analysts and investors or guidance we may have provided, resulting in a decline in our stock 
price and potential legal claims. Significant judgments, assumptions and estimates used in preparing our consolidated financial 
statements include those related to revenue recognition, stock-based compensation, purchase accounting, assessment of goodwill 
and long-lived assets for impairment, and income taxes.

Our tax liabilities may be greater than anticipated. 

Tax laws are dynamic and subject to change as new laws are passed and new interpretations of the law are issued or 
applied. In addition, governmental tax authorities are increasingly scrutinizing the tax positions of companies. Many countries in the 
European Union, as well as a number of other countries and organizations such as the Organization for Economic Cooperation and 
Development, are actively considering changes to existing tax laws that, if enacted, could increase our tax obligations in countries 
where we do business. If the U.S. or other foreign tax authorities change applicable tax laws, our overall taxes could increase, and 
our business, financial condition or results of operations may be adversely impacted.

45

The U.S. and non-U.S. tax laws applicable to our business activities are subject to interpretation. We are subject to audit by 

the Internal Revenue Service and by taxing authorities of the state, local, and foreign jurisdictions in which we operate. Our tax 
obligations are based in part on our corporate operating structure, including the manner in which we develop, value, and use our 
intellectual property and sell our solution, the jurisdictions in which we operate, how tax authorities assess revenue-based taxes such 
as sales and use taxes, the scope of our international operations, and the value we ascribe to our intercompany transactions. Taxing 
authorities may challenge our tax positions and methodologies for valuing developed technology or intercompany arrangements, as 
well as our positions regarding jurisdictions in which we are subject to certain taxes, which could expose us to additional taxes and 
increase our worldwide effective tax rate. Any adverse outcomes of such challenges to our tax positions could result in additional 
taxes for prior periods, interest, and penalties, as well as higher future taxes. In addition, our future tax expense could increase as a 
result of changes in tax laws, regulations, or accounting principles, or as a result of earning income in jurisdictions that have higher 
tax rates. An increase in our tax expense could have a negative effect on our financial position and results of operations. Moreover, 
determining our provision (benefit) for income taxes and other tax liabilities requires significant estimates and judgment by 
management, and the tax treatment of certain transactions is uncertain. Although we believe we will make reasonable estimates and 
judgments, the ultimate outcome of any particular issue may differ from the amounts previously recorded in our financial statements 
and any such occurrence could materially affect our financial position and results of operations.

Our ability to use our net operating losses and tax credit carryforwards to offset future taxable income may be subject to certain 
limitations, which could result in higher tax liabilities.

Our ability to fully utilize our net operating loss and tax credit carryforwards to offset future taxable income may be limited. 

At December 31, 2018, we had U.S. federal net operating loss carryforwards, or NOLs, of approximately $285.5 million, state 
NOLs of approximately $167.0 million, foreign NOLs of approximately $20.5 million, federal research and development tax credit 
carryforwards, or credit carryforwards, of approximately $10.2 million, state credit carryforwards of approximately $8.0 million. A 
lack of future taxable income would adversely affect our ability to utilize these NOLs and credit carryforwards. In addition, under 
Sections 382 and 383 of the Internal Revenue Code of 1986, as amended, or the Code, and comparable state income tax laws, a 
corporation that undergoes an "ownership change" is subject to limitations on its ability to utilize its NOLs and credit carryforwards 
to offset future taxable income following the ownership change. As a result, future changes in our stock ownership, including 
because of issuance of shares of common stock in connection with acquisitions or other direct or indirect changes in our ownership 
that may be outside of our control, could result in limitations on our ability to fully utilize our NOLs and credit carryforwards. The 
Company had an ownership change on December 31, 2015 subjecting the federal and state NOLs to an annual limitation. 
Additionally, the Company had an ownership change in January 2008 and $2.3 million of federal and state NOLs are already subject 
to limitation under Section 382 of the Code. Additionally, approximately $3.4 million of our federal NOLs and approximately 
$3.4 million of our state NOLs were generated during the pre-acquisition period by corporations that we acquired, and thus those 
NOLs already are subject to limitation under Section 382 of the Code and comparable state income tax laws. Also, depending on the 
level of our taxable income, a portion of our NOLs and credit carryforwards may expire unutilized, which could prevent us from 
offsetting future taxable income we may generate by the amount of our NOLs and credit carryforwards generated in tax years 
beginning before December 31, 2017. U.S. federal net operating loss carryforwards generated for tax years beginning before 
December 31, 2017 can offset 100% of taxable income, however, these NOLs can only be carried forward for 20 years. U.S. federal 
net operating loss carryforwards generated for tax years beginning after December 31, 2017 can offset 80% of taxable income, 
however, these NOLs can be carried forward indefinitely. We have recorded a full valuation allowance related to our NOLs, credit 
carryforwards, and other net deferred tax assets due to the uncertainty of the ultimate realization of the future benefits of those 
assets. To the extent we determine that all, or a portion of, our valuation allowance is no longer necessary, we will reverse the 
valuation allowance and recognize an income tax benefit in the reported financial statement earnings in that period. Once the 
valuation allowance is eliminated or reduced, its reversal will no longer be available to offset our current financial statement tax 
provision in future periods. Release of the valuation allowance would result in the recognition of certain net deferred tax assets and 
a decrease to income tax expense for the period the release is recorded. However, the exact timing and amount of the valuation 
allowance release are subject to change on the basis of the level of profitability that we are able to actually achieve.

We may require additional capital to support our business, and such capital might not be available on terms acceptable to us, if 
at all. Inability to obtain financing could limit our ability to conduct necessary operating activities and make strategic 
investments.

Various business challenges and opportunities may require additional funds, including the need to respond to competitive 
threats or market evolution by developing new solutions and improving our operating infrastructure through additional hiring or 
acquisition of complementary businesses or technologies, or both. In addition, we could incur significant expenses or shortfalls in 
anticipated cash generated as a result of unanticipated events in our business or competitive, regulatory, or other changes in our 
market, or longer payment cycles required or imposed by our buyers.

Our available cash and cash equivalents, any cash we may generate from operations, and our available line of credit under 

our credit facility may not be adequate to meet our capital needs, and therefore we may need to engage in equity or debt financings 

46

to secure additional funds. We may not be able to obtain additional financing on terms favorable to us, if at all. If we are unable to 
obtain adequate financing on terms satisfactory to us when we require it or are unable to renew our credit facility when it matures or 
enter into a new one, our ability to continue to support our business growth and respond to business challenges could be 
significantly impaired, and our business may be adversely affected.

If we do raise additional funds through future issuances of equity or convertible debt securities, our existing stockholders 

could suffer significant dilution, particularly due to the significant decline we have experienced in the market value of our common 
stock, and any new equity securities we issue could have rights, preferences and privileges superior to those of holders of our 
common stock. Any debt financing that we secure in the future could involve restrictive covenants relating to our capital raising 
activities and other financial and operational matters, including the ability to pay dividends. This may make it more difficult for us 
to obtain additional capital and to pursue business opportunities, including potential acquisitions. In addition, if we issue debt, the 
holders of that debt would have prior claims on the Company's assets, and in case of insolvency, the claims of creditors would be 
satisfied before distribution of value to equity holders, which would result in significant reduction or total loss of the value of our 
equity.

Our credit facility subjects us to operating restrictions and financial covenants that impose risk of default and may restrict our 
business and financing activities.

We have a $40.0 million credit facility with Silicon Valley Bank, currently subject to a $10.0 million reserve that will be 
released if we maintain positive adjusted EBITDA for any trailing twelve-month period. Borrowings are secured by substantially all 
of our tangible personal property assets and all of our intangible assets are subject to a negative pledge in favor of Silicon Valley 
Bank. This credit facility is, and any replacement credit facility that we may secure will be, subject to certain covenants and 
borrowing conditions, including those related to financial ratios and liquidity. If we fail to perform in accordance with covenants or 
to satisfy conditions, we may not be able to make borrowings under the facility. The credit facility is, and any replacement credit 
facility that we may secure will be, also subject to restrictions that limit our ability, among other things, to:

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dispose of or sell our assets;

make material changes in our business or management;

acquire, consolidate or merge with other entities;

incur additional indebtedness;

create liens on our assets;

pay dividends;

make investments;

enter into transactions with affiliates; and

pay off or redeem subordinated indebtedness.

These covenants may restrict our ability to finance our operations and to pursue our business activities and strategies. Our 

ability to comply with these covenants may be affected by events beyond our control. If a default were to occur and not be waived, 
such default could cause, among other remedies, all of the outstanding indebtedness under our loan and security agreement to 
become immediately due and payable. In such an event, our liquid assets might not be sufficient to meet our repayment obligations, 
and we might be forced to liquidate collateral assets at unfavorable prices or our assets may be foreclosed upon and sold at 
unfavorable valuations.

Our ability to renew our existing credit facility, which matures in September 2020, or to enter into a new credit facility to 

replace or supplement the existing facility may be limited due to various factors, including the status of our business, global credit 
market conditions, and perceptions of our business or industry by sources of financing. In particular, it may be difficult to renew or 
replace our existing credit facility if we are not able to produce, or demonstrate a path to produce, positive cash flow. In addition, if 
credit is available, lenders may seek more restrictive covenants and higher interest rates that may reduce our borrowing capacity, 
increase our costs, and reduce our operating flexibility.

If we make borrowings under the facility and do not have or are unable to generate sufficient cash available to repay our debt 

obligations when they become due and payable, either upon maturity or in the event of a default, we may not be able to obtain 
additional debt or equity financing on favorable terms, if at all. Our inability to obtain financing may negatively impact our ability 
to operate and continue our business as a going concern.

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Risks Related to the Securities Markets and Ownership of our Common Stock

The price of our common stock has been and may continue to be volatile and the value of an investment in our common stock 
could decline.

Technology stocks have historically experienced high levels of volatility. The trading price of our common stock has 
fluctuated substantially and may continue to do so. These fluctuations could result in significant decreases in the value of an 
investment in our common stock. Factors that could cause fluctuations in the trading price of our common stock include the 
following:

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announcements of new offerings, products, services or technologies, commercial relationships, acquisitions, or other
events by us or our competitors;

price and volume fluctuations in the overall stock market from time to time;

significant volatility in the market price and trading volume of technology companies in general and of companies in
the digital advertising industry in particular;

fluctuations in the trading volume of our shares or the size of our public float;

actual or anticipated changes or fluctuations in our results of operations;

actual or anticipated changes in the expectations of investors or securities analysts, and whether our results of
operations meet these expectations;

litigation involving us, our industry, or both;
regulatory developments in the United States, foreign countries, or both;

general economic conditions and trends;

major catastrophic events;

breaches or system outages;

departures of officers or other key employees; or

an adverse impact on the company resulting from other causes, including any of the other risks described in this
report.

In addition, if the market for technology stocks or the stock market, in general, experiences a loss of investor confidence, the 

trading price of our common stock could decline for reasons unrelated to our business. The trading price of our common stock might 
also decline in reaction to events that affect other companies in our industry even if these events do not directly affect us. In the past, 
volatility in the market price of a company's securities has often resulted in securities litigation being brought against that company. 
Declines in the price of our common stock, even following increases, may result in securities litigation against us, which would 
result in substantial costs and divert our management's attention and resources from our business.

As a result of the significant decline we have experienced in the market value of our common stock, we no longer represent a 
permissible investment under the policies of some institutional investors. Further, our declining financial performance and lack of a 
clear path to growth and profitability make our stock an undesirable investment to many investors. As the pool of investors for our 
stock decreases, it becomes more difficult to attract the demand needed to support increases in the price of our stock.

Our equity compensation and acquisition practices expose our stockholders to dilution.

We have relied and may continue to rely heavily upon equity compensation, and consequently our outstanding unvested 

equity awards represent substantial dilution to our stockholders. In addition, we have used our common stock as consideration for 
acquisitions of other companies, and we may use shares of our common stock or securities convertible into our common stock from 
time to time in connection with financings, acquisitions, investments, or other transactions. Any such issuance could result in 
substantial dilution to our existing stockholders and cause the trading price of our common stock to decline. 

Our public float is still relatively small, increasing the risk that sales by significant holders could adversely affect the market 
price for our stock.

The average daily trading volume for our common stock during 2018 was 531,169 shares. In addition, we are relatively new 

to the public markets and not well known to many analysts, investors, and others who could influence demand for our shares. 
Further, because we are a relatively small company without an established history of profitability, the range of investors willing to 
invest in our shares may be relatively limited. As a result of these factors, our shares can be susceptible to sudden, rapid declines in 
price, especially when large blocks of shares are sold. Under our Insider Trading Policy, we impose trading blackouts during the 
period beginning on or about the fifteenth day of the last month of each quarter and ending after two trading days following the 
filing of our next Quarterly Report on Form 10 Q or Annual Report on Form 10-K. All of our employees are limited to selling their 

48

equity incentive plan shares during these open window periods. In addition, our employee restricted stock and restricted stock unit 
awards typically vest each May 15 and November 15, and are subject to automatic sale arrangements at those dates to cover taxes 
accruing on vesting. Finally, shares we issue as consideration for acquisitions may be subject to lock-up arrangements that expire in 
large numbers on certain dates. These insider trading windows, restricted stock vesting mechanics, and acquisition stock 
arrangements tend to concentrate selling into certain periods, and the resulting sales pressure can cause the trading price of our 
common stock to decline at those times. Sales of a substantial number of such shares, or the perception that such sales may occur, 
could cause our share price to fall or make it more difficult for investors to sell our common stock at a time and price that they deem 
appropriate, and could also impair our ability to raise capital through the sale of equity securities.

Competition for investors could adversely affect the price of our stock.

There are many companies in the advertising technology or "ad tech" space, but we are one of a relatively small portion of 

those companies that is publicly traded. Some of the other publicly traded ad tech companies are substantially larger than we are and 
have more diversified offerings, or may be perceived by investors as having greater stability or growth potential. Others may be 
focused on parts of the business that investors may view as more appealing. Ad tech or related advertising companies that are not 
yet public may become public, and publicly traded companies may enter the ad tech business through acquisitions. Increase in the 
number of publicly traded companies available to investors wishing to invest in ad tech may result in a decrease in demand for our 
shares, either because overall demand for ad tech investment does not increase commensurately with the increase in public 
companies in the ad tech space, or because we are not perceived as competitively differentiated or offering superior value compared 
to other such companies. Decrease in demand for our shares would result in suppressed growth, or decrease, in the value of our 
stock.

Our business could be negatively affected as a result of actions of activist stockholders.

Campaigns by stockholders to effect changes at publicly traded companies are sometimes led by investors seeking to increase 
short-term stockholder value through actions such as financial restructuring, increased debt, special dividends, stock repurchases or 
sales of assets or the entire company. The declines we have experienced in the market value of our common stock could increase the 
likelihood of an activist stockholder targeting our company. If we are targeted by an activist stockholder in the future, the process 
could be costly and time-consuming, disrupt our operations and divert the attention of management and our employees from 
executing our strategic plan. Additionally, perceived uncertainties as to our future direction as a result of stockholder activism or 
changes to the composition of our board of directors may lead to the perception of a change in the direction of our business, 
instability or lack of continuity, which may be exploited by our competitors, cause concern to current or potential buyers and sellers 
on our platform, who may choose to transact with our competitors instead of us, and make it more difficult to attract and retain 
qualified personnel.

If securities or industry analysts do not publish research or reports about our business, or publish inaccurate or unfavorable 
research or reports about our business, our share price and trading volume could decline.

The trading market for our common stock to some extent depends on the research and reports that securities or industry 
analysts publish about us. We do not control these analysts, and their reports or analyst consensus may not reflect our guidance, 
plans, or expectations. If one or more of the analysts who cover us downgrades our shares or expresses a negative opinion of our 
business prospects, our share price could decline. We have lost some analyst coverage as our financial performance has declined, 
and if we do not demonstrate revenue growth and a path to profitability, our remaining analysts may cease coverage. If one or more 
of these analysts decreases or ceases coverage of our company, we could lose visibility in the financial markets, which could cause 
our share price or trading volume to decline.

We do not intend to pay dividends for the foreseeable future and, consequently, investors' ability to achieve a return on their 
investment will depend on appreciation in the price of our common stock.

We have never declared or paid any dividends and we do not anticipate paying any cash dividends in the foreseeable future. 
In addition, our credit facility contains restrictions on our ability to pay dividends. As a result, investors may only receive a return 
on their investment in our common stock if the market price of our common stock increases.

Provisions of our charter documents and Delaware law may inhibit a potential acquisition of the company and limit the ability of 
stockholders to cause changes in company management.

Our amended and restated certificate of incorporation and amended and restated bylaws include provisions, as described 

below, that could delay or prevent a change in control of the company, and make it difficult for stockholders to elect directors who 
are not nominated by the current members of our board of directors or take other actions to change company management.

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Our certificate of incorporation gives our board of directors the authority to issue shares of preferred stock in one or
more series, and to establish the number of shares in each series and to fix the price, designations, powers,
preferences and relative, participating, optional or other rights, if any, and the qualifications, limitations, or
restrictions of each series of the preferred stock without any further vote or action by stockholders. The issuance of
shares of preferred stock may discourage, delay or prevent a merger or acquisition of the company by significantly
diluting the ownership of a hostile acquirer, resulting in the loss of voting power and reduced ability to cause a
takeover or effect other changes.

Our certificate of incorporation provides that our board of directors is classified, with only one of its three classes
elected each year, and directors may be removed only for cause and only with the vote of 66 2/3% of the voting power
of stock outstanding and entitled to vote thereon. Further, the number of directors is determined solely by our board
of directors, and because we do not allow for cumulative voting rights, holders of a majority of shares of common
stock entitled to vote may elect all of the directors standing for election. These provisions could delay the ability of
stockholders to change the membership of a majority of our board of directors.

Under our bylaws, only the board of directors or a majority of remaining directors, even if less than a quorum, may
fill vacancies resulting from an increase in the authorized number of directors or the resignation, death or removal of
a director.

Our certificate of incorporation prohibits stockholder action by written consent, so any action by stockholders may
only be taken at an annual or special meeting.

Our certificate of incorporation provides that a special meeting of stockholders may be called only by the board of
directors. This could delay any effort by stockholders to force consideration of a proposal or to take action, including
the removal of directors.

Under our bylaws, advance notice must be given to nominate directors or submit proposals for consideration at
stockholders' meetings. This gives our board of directors time to defend against takeover attempts and could
discourage or deter a potential acquirer from soliciting proxies or making proposals related to an unsolicited
takeover attempt.

The provisions of our certificate of incorporation noted above may be amended only with the affirmative vote of
holders of at least 66 2/3% of the voting power of all of the then-outstanding shares of the company's voting stock,
voting together as a single class. The same two-thirds vote is required to amend the provision of our certificate of
incorporation imposing these supermajority voting requirements. Further, our bylaws may be amended only by our
board of directors or by the same percentage vote of stockholders noted above as required to amend our certificate of
incorporation. These supermajority voting requirements may inhibit the ability of a potential acquirer to effect such
amendments to facilitate an unsolicited takeover attempt.

Our board of directors may amend our bylaws by majority vote. This could allow the board to use bylaw
amendments to delay or prevent an unsolicited takeover, and limits the ability of an acquirer to amend the bylaws to
facilitate an unsolicited takeover attempt.

We are also subject to Section 203 of the Delaware General Corporation Law, which prohibits us from engaging in any 
business combination with an interested stockholder for a period of three years from the date the person became an interested 
stockholder, unless certain conditions are met. These provisions make it more difficult for stockholders or potential acquirers to 
acquire the company without negotiation and may apply even if some of our stockholders consider the proposed transaction 
beneficial to them. For example, these provisions might discourage a potential acquisition proposal or tender offer, even if the 
acquisition proposal or tender offer were to be at a premium over the then-current market price for our common stock. These 
provisions could also limit the price that investors are willing to pay in the future for shares of our common stock.

Item 1B. Unresolved Staff Comments

None.

Item 2. Properties

Our corporate headquarters are located in Los Angeles, California, where we occupy facilities totaling approximately 

47,000 square feet under a lease that expires in 2021. We use these facilities for our principal administration, sales and marketing, 
technology and development, and engineering activities. We also lease additional offices and maintain data centers in other  
locations in North America, South America, Europe, Australia, and Asia. We believe that our current facilities are adequate to meet 
50

our current needs, and that, if we require additional space, we will be able to obtain additional facilities on commercially reasonable 
terms.

Item 3. Legal Proceedings

We and our subsidiaries may from time to time be parties to legal or regulatory proceedings, lawsuits and other claims 

incident to our business activities and to our status as a public company. Such matters may include, among other things, 
assertions of contract breach or intellectual property infringement, claims for indemnity arising in the course of our business, 
regulatory investigations or enforcement proceedings, and claims by persons whose employment has been terminated. Such 
matters are subject to many uncertainties, and outcomes are not predictable with assurance. Consequently, we are unable to 
ascertain the ultimate aggregate amount of monetary liability, amounts which may be covered by insurance or recoverable from 
third parties, or the financial impact with respect to such matters as of December 31, 2018. However, based on our knowledge as 
of December 31, 2018, we believe that the final resolution of such matters pending at the time of this report, individually and in 
the aggregate, will not have a material adverse effect upon our consolidated financial position, results of operations or cash 
flows.

On March 31, 2017, Guardian News & Media Limited ("Guardian") issued proceedings (the "Complaint") against us in 
the Chancery Division of the High Court of Justice in England & Wales. The Complaint alleged that we underpaid Guardian for 
inventory sold by Guardian through our platform as a result of the fact that we charged fees to buyers of that inventory. Guardian 
claimed we were precluded from charging buyer fees as a result of our contractual arrangements with Guardian and English 
agency law principles, as well as representations we allegedly made to Guardian. The Complaint claimed damages including loss 
of revenue, interest, and costs. On October 11, 2018, we and Guardian mutually agreed to resolve our dispute and the High Court 
proceedings have been discontinued. Though the terms of the settlement agreement are confidential, the settlement is immaterial 
to us from a financial standpoint. However, if we face similar claims from other clients or as a preventative measure, we might 
decide to make changes to our business practices that could have a material impact on our financial position.

Item 4. Mine Safety Disclosures

Not applicable.

51

PART II
Item 5. Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

Our common stock has been listed on the New York Stock Exchange, or the NYSE, since April 1, 2014, under the 

symbol "RUBI". Prior to our initial public offering, or IPO, there was no public market for our common stock. 

Holders of Record

As of February 21, 2019, there were approximately 76 holders of record of our common stock. The actual number of 

stockholders is greater than this number of record holders and includes stockholders who are beneficial owners but whose shares 
are held in street name by brokers and other nominees. This number of holders also does not include stockholders whose shares 
may be held in trust by other entities.

Dividend Policy

We have never declared or paid any dividends and we do not anticipate paying any cash dividends in the foreseeable 

future. In addition, our credit facility contains restrictions on our ability to pay dividends.

Purchases of Equity Securities by the Issuer and Affiliated Purchasers

We presently have no publicly announced repurchase plan or program.

Upon vesting of most restricted stock units or stock awards, we are required to deposit minimum statutory employee 

withholding taxes on behalf of the holders of the vested awards. As reimbursement for these tax deposits, we have the option to 
withhold from shares otherwise issuable upon vesting a portion of those shares with a fair market value equal to the amount of the 
deposits we paid. Withholding of shares in this manner is accounted for as a repurchase of common stock.

Common stock repurchases during the quarter ended December 31, 2018 were as follows (in thousands, except per share 

amounts):

Period

Total Number of
Shares Purchased

Average Price Paid per
Share

Total Number of Shares
Purchased as Part of a
Publicly Announced
Program

Maximum Approximate
Dollar Value that May
Yet be Purchased Under
the Program

October 1 – October 31, 2018
November 1 – November 30, 2018
December 1 – December 31, 2018

Use of Proceeds

$
1
$
213
— $

3.41
4.62
—

— $
— $
— $

—
—
—

In April 2014, we closed our IPO, whereby we sold 6,432,445 shares of common stock (including 1,015,649 shares sold 

pursuant to the underwriters' exercise of their over-allotment option), and the selling stockholders sold 1,354,199 shares of 
common stock. There has been no material change in the planned use of proceeds from our IPO as described in our final 
prospectus filed with the SEC on April 2, 2014 pursuant to Rule 424(b) of the Securities Act. 

Item 6. Selected Financial Data

This section is not required for smaller reporting companies. 

52

Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations

You should read the following discussion and analysis of our financial condition and results of operations in conjunction 

with the consolidated financial statements and the related notes to those statements included in Item 8 to this Annual Report on 
Form 10-K. In addition to historical financial information, the following discussion contains forward-looking statements that reflect 
our plans, estimates, beliefs, and expectations and that involve risks and uncertainties. Our actual results and the timing of events 
could differ materially from those discussed in these forward-looking statements. Factors that could cause or contribute to these 
differences include those discussed below and elsewhere in this Annual Report on Form 10-K, particularly in "Item 1A. Risk 
Factors" and the "Special Note About Forward-Looking Statements."

Overview

We provide a technology solution to automate the purchase and sale of digital advertising inventory for buyers and sellers. 

Our platform features applications and services for digital advertising inventory sellers, including websites, mobile applications, 
other digital media properties, and their representatives to sell their digital advertising inventory; applications and services for 
buyers, including advertisers, agencies, agency trading desks, and demand side platforms, or DSPs, to buy digital advertising 
inventory; and a marketplace over which such transactions are executed. Together, these features power and enhance a 
comprehensive, transparent, independent advertising marketplace that brings buyers and sellers together and facilitates intelligent 
decision-making and automated transaction execution for the digital advertising inventory we manage on our platform. Our clients 
include many of the world’s leading publishers of websites and mobile applications and buyers of digital advertising inventory.

Advertising inventory takes different forms, referred to as advertising units, is purchased and sold through different 

transactional methodologies, and allows advertising content to be presented to consumers through different channels. Our solution 
enables buyers and sellers to purchase and sell:

•
•

•

a comprehensive range of advertising units, including display, audio and video;
that are transacted through real-time bidding ("RTB"), which includes (i) direct sale of premium inventory, which we refer
to as private marketplace ("PMP"), and (ii) open auction bidding, which we refer to as open marketplace ("OMP"); and

that are displayed across digital channels, including mobile web, mobile application, and desktop, as well as across various
out-of-home channels, such as digital billboards.

We generate revenue from transactions where we provide a platform for the purchase and sale of digital advertising inventory.
Digital advertising inventory is created when consumers access sellers’ content. Sellers provide digital advertising inventory to our 
platform in the form of advertising requests, or ad requests. When we receive ad requests from sellers, we send bid requests to buyers, 
which enable buyers to bid on sellers’ digital advertising inventory. Winning bids can create advertising, or paid impressions, for the 
seller to present to the consumer. The volume of paid impressions measured as a percentage of ad requests is referred to as fill rate. 
The price that buyers pay for each thousand paid impressions purchased is measured in units referred to as CPM.

The total volume of spending between buyers and sellers on our platform is referred to as advertising spend. We keep a 
percentage of that advertising spend as a fee, and remit the remainder to the seller. The fee or “take rate” that we retain from the 
gross advertising spend on our platform is recognized as revenue. The fee earned on each transaction is based on the pre-existing 
agreement between the Company and the seller and the clearing price of the winning bid. We discuss advertising spend and take rate 
more fully in the “Non-GAAP Financial Measures” section below.

Industry Trends and Trends in Our Business

Market Opportunities

The programmatic digital advertising market continues to experience growth. In September 2018, MAGNA estimated 

that the global programmatic market (excluding search and social) will grow from $34 billion in 2018 to $60 billion by 2022, 
which represents a 15% compound annual growth rate over that period. Another important trend in the digital advertising industry 
is the continued expansion of automated buying and selling of advertising inventory through new and developing channels, 
including mobile, which has market growth rates exceeding those of the desktop channel and is a critical area of operational focus 
for us. According to MAGNA estimates, mobile advertising was an $18 billion global market in 2018 that is expected to increase 
to $43 billion by 2022, producing a compound annual growth rate of 24%.

Consistent with industry trends, our mobile business is growing faster than desktop. Our mobile advertising spend 

increased $152.2 million, or 42%, for the year ended December 31, 2018, compared to the year ended December 31, 2017, while 
our desktop business increased only 1% during the same period. Our mobile business consists of two components, mobile web 
and mobile applications. Initially our mobile business was built upon mobile web, which is more similar to our desktop business 

53

and subject to many of the same market pressures as discussed below, and as a result has experienced lower growth in recent 
periods. Our mobile application business, which is where we see the greatest potential for growth, has shown growth rates in 
excess of industry projections. Advertising spend from mobile applications is approaching half of our mobile business.

The growth of automated buying and selling of advertising is also expanding into geographic markets outside of the 

United States, and in some markets, the adoption rate of programmatic digital advertising is greater than in the United States. We
attribute advertising spend to the geographic location of the seller on whose inventory the advertising spend was directed. Our
markets outside of the United States are more heavily built upon desktop display advertising than they are on mobile, and as such
are subject to the same factors impacting our desktop business as described below. In addition, as programmatic advertising has
grown in markets outside of the United States, we have seen more competitors enter those markets aggressively and gain market
share. As a result of these factors, the portion of our advertising spend attributed to markets outside the United States declined to 
34% during the year ended December 31, 2018 from 39% during the same period in 2017. Another factor impacting our business 
is that a large share of the growth in digital advertising spending worldwide is being captured by owned and operated sites, such 
as Facebook, Google, and increasingly Amazon.

Macro Trends Impacting Desktop

These market factors present long-term growth opportunities; however, in the near term the industry-wide shift from 

desktop to mobile advertising has had an adverse impact on our business. In recent years, we have seen an industry-wide 
slowdown in the growth rate for traditional desktop advertising, and the growth rate for this portion of the market is expected to 
flatten in future years. According to MAGNA, programmatic desktop advertising is expected to grow at a 1% compound annual 
growth rate over the 2018-2022 period. This results from the market shift to mobile channels noted above. These trends are 
having a significant effect on our overall growth rate, because desktop advertising continues to be a significant part of our core 
business, representing 48% of advertising spend in 2018. As noted above, our advertising spend in desktop increased 1% during 
the year ended December 31, 2018 compared to the year ended December 31, 2017. In addition to the ongoing industry shift 
away from desktop to mobile, year-over-year growth in our desktop business is hampered further by the continued migration to 
header bidding, which to date has been focused primarily on desktop display advertising inventory. While header bidding has 
increased competition for inventory, it also has made available to us significant amounts of inventory that previously we were 
unable to access, and while our traditional desktop display business has remained relatively flat, our header bidding solution 
gained significant traction in 2017 and through 2018. 

Header bidding is going through an additional technical evolution from the client side, which involves the browser 
running the auction, to a server-side solution, in which a server runs the auction and offers the potential for improved performance 
and speed. We believe that our investments in our client-side header bidding solution as well as server-side header bidding have 
the potential to improve our competitiveness in all markets in future periods. However, we must continue to address certain 
technical and operational challenges, as described under "Risk Factors" in this Annual Report on Form 10-K, in order to realize 
our header bidding solution's full potential. 

Because of these rapid developments in the industry, advertising spend from our traditional desktop display business has 
remained relatively flat and no longer can be relied upon to be the primary growth driver of our business. Our strategic focus is on 
growth areas—including mobile, video, PMPs, and header bidding—that are expected to represent a majority of our advertising 
spend in future periods. However, despite our solid progress in mobile, our traditional desktop display business is expected to 
continue to represent a significant part of our business in the near term. Therefore, the weight of our desktop display business will 
continue to have a significant adverse effect on our growth until our advertising spend mix has shifted more fully to growth areas. 

Year-Over-Year Revenue Decline

Ad tech exchange intermediaries like us have experienced market demands for transparency and reduced costs 
throughout the value chain. Throughout 2017, we changed our revenue model in response to market pressures in an effort to be 
more competitive in attracting demand and capturing supply. In late 2017, we made a strategic decision to reduce the fees we 
charged buyers in OMP waterfall transactions, and ultimately eliminated buyer fees in November 2017. 

We have historically charged fees to both buyers and sellers in OMP transactions conducted on our exchange, consistent 

with the fact that we provide services to each. Traditionally, for OMP waterfall transactions, we ran a modified second price 
auction in which the clearing price was the greater of the second highest bid in the auction plus one cent or the applicable price 
floor. Our buyer fees were determined algorithmically and added to the clearing price to determine the price charged to the 
winning bidder. In traditional OMP waterfall transactions, available impressions are passed to different demand sources in a 
sequence determined by the seller’s ad server, and when an impression is passed to a particular demand source, that demand 
source is generally able to auction the impression with little or no competition. We saw the mix of OMP transactions conducted 
through the traditional ad server waterfall on our exchange decrease significantly while the percentage of header bidding 
transactions has increased in 2018.

54

Header bidding increases competition for ad inventory by exposing impressions simultaneously to multiple sources of 

demand in a competitive auction that, if successful, replaces the ad server waterfall. Each demand source in a header bidding 
auction generally conducts its own auction for the impression and then passes its winning bid to a “downstream” meta-auction in 
which the seller evaluates bids from all its demand sources, and generally the highest bid wins. This competition pushes auction 
clearing prices much closer to the winning first-price bid than OMP waterfall transactions. In order to be more competitive and 
give our buyers a better chance of winning the header bidding impressions on which they bid, we began charging lower buyer 
fees for header bidding transactions so that we could pass higher priced bids into the downstream auction. Based upon experience 
with this approach and client feedback, we began offering a modified first price auction dynamic in our header bidding solution 
without buyer fees in the fourth quarter of 2017. Subsequently, in an effort to capture more inventory for our buyers and deliver 
better monetization to our sellers, and to provide better transparency and predictability to all our clients, in early 2018 we made 
first price our default auction dynamic for header bidding transactions. This means that the first price or highest bid in our auction 
wins and that first price is passed to the downstream auction. Because buyers needed time to adapt their systems and bidding 
strategies to first-price auction dynamics and maximize advertising campaign returns and performance, or may prefer not to 
develop their own first price pricing algorithms, we built and implemented an optional feature at no additional cost, which we call 
Estimated Market Rate ("EMR"). This feature uses algorithms that monitor existing market conditions against our dataset of 
auction outcomes to look for opportunities to reduce the amount of the bid that we pass through to the downstream auction on 
behalf of our winning bidder, while maintaining high fill rates. This is intended to help buyers bid on digital advertising inventory 
consistent with market values while preserving demand and budget for sellers on our platform. In addition to increasing the rate at 
which buyers win in our auctions, and the monetization that that winning provides to sellers, our first price auction dynamic and 
EMR solution have contributed to higher CPMs for our header bidding inventory.

In November 2017, we ceased charging our additive buyer fees altogether. We do still charge access fees to allow buyers 

to connect to our system when their spending is too small to support the maintenance of their accounts, although such amounts 
are not significant. This strategic decision, as well as cost reductions noted below, has helped to support our objective to be a high 
volume, lower cost and transparent exchange. Most of our marketplace fees are negotiated with sellers as a percentage of the 
auction clearing price for sale of their inventory. In some cases, we reduce the buyer’s bid amount by the amount of our fee and 
pass the remainder as the bid to the seller. If the bid wins, we retain the amount of the bid reduction as our fee, which is referred 
to as net bidding. We do this at the discretion of sellers that allocate digital advertising inventory through a decisioning process 
that follows after our auction and incorporates other demand sources as well as our bids, and that prefer or require that we submit 
our bids to them net of our fees, so that our bid matches the amount we will owe them if we win. Net bidding amounts can vary 
across transactions depending upon various factors including inventory and auction characteristics and seller policies.

These pricing reductions were intended to address the market's demand for lower costs and to attract more inventory and 

spending to our platform. Lower pricing has caused our revenue to decline significantly in 2018 compared to 2017, even though 
ad spend grew. To return to revenue growth, we must continue to increase advertising spend on our platform. Increases in PMP 
and header bidding transactions as a percentage of the activity on our exchange could yield higher advertising spend despite lower 
take rates due to higher CPMs typically associated with PMP transactions, and from modified first-price auctions in header 
bidding transactions. However, in an increasingly competitive market in which buyers and sellers have many choices, it is not 
clear whether pricing reductions will result in increases in spending on our platform, or whether any spending increases will 
compensate fully for the reduction in pricing. We have seen significant increases in the volume of ad requests we receive, but the 
rate at which we win header bidding auctions is much lower than the rate at which we win waterfall transactions. As our business 
continues to rely on header bidding, which now represents approximately 80% of our revenue, we need to participate in more 
header bidding auctions and increase the fill rate in header bidding auctions to compensate for the decline in the number of 
waterfall transactions. Driving revenue growth in this situation is difficult to accomplish in a competitive market and requires 
accessing significantly greater inventory levels from our sellers and in turn processing more auctions. This growth in business 
volume requires adequate processing capacity as well as ongoing innovation to address evolving client needs, capture business, 
and improve our fill rate. Throughout 2018, we worked to increase advertising spend on our platform, through both higher 
transaction volumes and by increasing seller fees, to put us in a position to be able to grow our business and maintain our cash 
resources. 

Expense Reduction Initiatives

In addition to strategic decisions made to reduce costs paid by our clients on our platform while growing revenue 

through transaction volume, we have also focused on the cost structure of our business to enable us to compete more effectively. 
We must operate efficiently to relieve the pressure on our margins and cash resources that has resulted from our price reductions 
and to compensate for the ongoing investments in technology and data processing capabilities required to support the increased 
volume of transactions that our growth plans require. As part of these efforts, during the first quarter of 2018 we undertook 
measures to reduce headcount by approximately 100 people, or 19% of our workforce, and to reduce other operating costs. Our 
actions included reductions in administrative staff to bring our general and administrative operations into better alignment with 

55

the current size of the business as well as in sales and technical personnel as a result of offshoring certain development functions, 
organizational delayering and restructuring, and reducing investment in unprofitable projects. We are continuously evaluating our 
costs and pursuing additional cost-control and efficiency opportunities, including increased automation, across all aspects of the 
Company. 

Uncertainty Resulting from GDPR

The European General Data Protection Regulation, or GDPR, added significant new regulatory requirements that are 
applicable to us as well as our clients and competitors. Some critical elements of the GDPR are still unclear, and there has not 
been time for consistent regulatory guidance to be developed, or for established industry compliance practices to emerge. In 
particular and despite being past the implementation date, uncertainty about the requirements regarding end-user consent, and 
diverging interpretations among sellers and buyers as to the adequacy of any consent that is obtained, could result in the removal 
of personal data from bid requests, which will lower the value of the impressions, resulting in reduced revenue and advertising 
spend for us. Until prevailing industry standards emerge, our revenue from European sellers could fluctuate from quarter to 
quarter.

Components of Our Results of Operations 

We report our financial results as one operating segment. Our consolidated operating results, together with non-GAAP 
financial measures, are regularly reviewed by our chief operating decision maker, principally to make decisions about how we 
allocate our resources and to measure our consolidated operating performance. 

Revenue 

We generate revenue from the purchase and sale of digital advertising inventory through our marketplace. We recognize 

revenue upon the fulfillment of our contractual obligations in connection with a completed transaction, subject to satisfying all 
other revenue recognition criteria. Our revenue recognition policies are discussed in more detail within Note 4 of the 
accompanying Notes to the Consolidated Financial Statements.

Expenses 

We classify our expenses into the following categories: 

Cost of Revenue. Our cost of revenue consists primarily of data center costs, bandwidth costs, depreciation and 
maintenance expense of hardware supporting our revenue-producing platform, amortization of software costs for the development 
of our revenue-producing platform, amortization expense associated with acquired developed technologies, personnel costs, 
facilities-related costs, and for transactions we have previously reported on a gross basis, the amounts we paid sellers. Personnel 
costs included in cost of revenue include salaries, bonuses, stock-based compensation, and employee benefit costs, and are 
primarily attributable to personnel in our network operations group who support our platform. We capitalize costs associated with 
software that is developed or obtained for internal use and amortize the costs associated with our revenue-producing platform in 
cost of revenue over their estimated useful lives. We amortize acquired developed technologies over their estimated useful lives.

Sales and Marketing. Our sales and marketing expenses consist primarily of personnel costs, including stock-based 

compensation and the sales bonuses paid to our sales organization, as well as marketing expenses such as brand marketing, travel 
expenses, trade shows and marketing materials, professional services, and amortization expense associated with client 
relationships and backlog from our business acquisitions, and to a lesser extent, facilities-related costs and depreciation and 
amortization. Our sales organization focuses on increasing the adoption of our solution by existing and new buyers and sellers. 
We amortize acquired intangibles associated with client relationships and backlog from our business acquisitions over their 
estimated useful lives.

Technology and Development. Our technology and development expenses consist primarily of personnel costs, including 

stock-based compensation and bonuses, as well as professional services associated with the ongoing development and 
maintenance of our solution, and to a lesser extent, facilities-related costs and depreciation and amortization, including 
amortization expense associated with acquired intangible assets from our business acquisitions that are related to technology and 
development functions. These expenses include costs incurred in the development, implementation, and maintenance of internal 
use software, including platform and related infrastructure. Technology and development costs are expensed as incurred, except to 
the extent that such costs are associated with internal use software development that qualifies for capitalization, which are then 
recorded as internal use software development costs, net, on our consolidated balance sheets. We amortize internal use software 
development costs that relate to our revenue-producing activities on our platform to cost of revenue and amortize other internal 
use software development costs to technology and development costs or general and administrative expenses, depending on the 
nature of the related project. We amortize acquired intangibles associated with technology and development functions from our 
business acquisitions over their estimated useful lives.

56

General and Administrative. Our general and administrative expenses consist primarily of personnel costs, including 
stock-based compensation and bonuses, associated with our executive, finance, legal, human resources, compliance, and other 
administrative personnel, as well as accounting and legal professional services fees, facilities-related costs and depreciation and 
amortization, and other corporate-related expenses. General and administrative expenses also include amortization of internal use 
software development costs and acquired intangible assets from our business acquisitions over their estimated useful lives that 
relate to general and administrative functions.

Restructuring and Other Exit Costs. Our restructuring and other exit costs consist primarily of employee termination 

costs, including stock-based compensation charges, and facility closure costs.

Impairment of Intangible Assets and Internal Use Software. Our impairment charges are non-cash charges related to our 

intangible assets and internal use software. Certain events or changing circumstances that impact the value of our intangible assets 
may necessitate a valuation analysis, as described within "Critical Accounting Policies" and in Note 2 "Organization and 
Summary of Significant Accounting Policies" of the accompanying Notes to the Consolidated Financial Statements. If needed, an 
impairment is recorded to reduce the carrying amount of the assets to their estimated fair value in the period that the valuation 
analysis is performed.

Impairment of Goodwill. Goodwill impairment charges are non-cash expenses recognized to reduce the goodwill asset 

on our balance sheet. Certain events or changing circumstances that impact the value of our business may necessitate a valuation 
analysis, as described within "Critical Accounting Policies" and in Note 2 "Organization and Summary of Significant Accounting 
Policies" of the accompanying Notes to the Consolidated Financial Statements. If the estimated fair value of the Company is 
lower than its carrying amount, a goodwill impairment is recognized for the difference, up to the carrying amount of goodwill.

Other (Income), Expense

Interest (Income) Expense, Net.  Interest income consists of interest earned on our cash equivalents and marketable 

securities. Interest expense is mainly related to our credit facility and was insignificant for the years ended December 31, 2018 
and 2017. 

Other Income. Other income consists primarily of rental income from commercial office space we hold under lease and 

have sublet to other tenants.

Foreign Currency Exchange (Gain) Loss, Net. Foreign currency exchange (gain) loss, net consists primarily of gains and 

losses on foreign currency transactions. We have foreign currency exposure related to our accounts receivable and accounts 
payable that are denominated in currencies other than the U.S. Dollar, principally the British Pound and the Euro. 

Provision (Benefit) for Income Taxes 

Provision (benefit) for income taxes consists of federal, state, and foreign income taxes and is primarily the result of the 
domestic valuation allowance and the tax liability associated with foreign subsidiaries. Due to uncertainty as to the realization of 
benefits from the predominant portion of our domestic and international net deferred tax assets, including net operating loss 
carryforwards and research and development tax credits, we have a full valuation allowance reserved against such net deferred tax 
assets. We intend to continue to maintain a full valuation allowance on our deferred tax assets until there is sufficient evidence to 
support the reversal of all or some portion of these allowances. Release of the valuation allowance would result in the recognition 
of certain net deferred tax assets and a decrease to income tax expense or recognition of a benefit for the period the release is 
recorded. However, the exact timing and amount of the valuation allowance release are subject to change on the basis of the level 
of profitability that we are able to achieve.

On December 22, 2017, the U.S. government enacted the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act includes 

significant changes to the U.S. corporate income tax system including the following: a federal corporate rate reduction from 34% 
to 21%; limitations on the deductibility of executive compensation and research and development expenditures; temporary 
immediate expensing of qualified property; the creation of new minimum taxes such as the base erosion anti-abuse tax (“BEAT”) 
and Global Intangible Low Taxed Income (“GILTI”) tax; and the transition of U.S. international taxation from a worldwide tax 
system to a modified territorial tax system, which resulted in a one time U.S. tax liability on those earning which had not 
previously been repatriated to the U.S. (the “Transition Tax”).

The Tax Act imposes a Transition Tax on previously untaxed accumulated and current earnings and profits (“E&P”) of 

certain of our foreign subsidiaries. To determine the amount of the Transition Tax, we determined, among other things, the 
amount of post-1986 E&P of the relevant subsidiaries. We recorded a provisional Transition Tax of $0.6 million, which reduced 
our U.S. net deferred tax assets for the year ended December 31, 2017. We completed our analysis of the impact of U.S. tax 
reform during 2018, and for the year ended December 31, 2018, there was no change to the Transaction Tax recorded in the prior 
period.

57

The Tax Act requires certain GILTI income earned by controlled foreign corporations (“CFCs”) to be included in the 

gross income of the CFCs’ U.S. shareholder (for tax years beginning after December 31, 2017). For the year ended December 31, 
2018, we have included a GILTI inclusion of $1.3 million, which was incorporated into the calculation of the tax provision. 

Results of Operations

The following table sets forth our consolidated results of operations:

Revenue
Expenses (1)(2):

Cost of revenue

Sales and marketing

Technology and development

General and administrative

Restructuring and other exit costs

Impairment of intangible assets and internal use software

Impairment of goodwill

Total expenses

Loss from operations

Other income, net

Loss before income taxes

Provision (benefit) for income taxes

Net loss

NM - Not Meaningful

Year Ended

December 31, 2018

December 31, 2017

(in thousands)

$

124,685

$

155,545

60,003

44,556

37,863

42,431

3,440
—

—

188,293

(63,608)

(2,143)

(61,465)

357

$

(61,822) $

56,836

51,794

47,500

55,596

5,959

4,585

90,251

312,521

(156,976)

(431)

(156,545)

(1,762)

(154,783)

Favorable/
(Unfavorable) %

(20)%

(6)%

14 %

20 %

24 %

42 %

100 %

100 %

40 %

59 %

397 %

61 %

NM

60 %

(1) Stock-based compensation expense included in our expenses was as follows:

Cost of revenue

Sales and marketing
Technology and development

General and administrative

Restructuring and other exit costs

Total stock-based compensation expense

(2) Depreciation and amortization expense included in our expenses was as follows:

Cost of revenue

Sales and marketing
Technology and development

General and administrative

Total depreciation and amortization expense

58

Year Ended

December 31, 2018

December 31, 2017

$

$

(in thousands)

321

$

4,557

2,867

8,139

398

404

4,582

4,034

9,924

1,560

16,282

$

20,504

Year Ended

December 31, 2018

December 31, 2017

$

$

(in thousands)

33,306

$

586

882

564

35,338

$

31,981

1,066

1,957

1,221

36,225

The following table sets forth our consolidated results of operations for the specified periods as a percentage of our 

revenue for those periods presented:

Revenue

Cost of revenue

Sales and marketing

Technology and development

General and administrative

Restructuring and other exit costs

Impairment of intangible assets and internal use software

Impairment of goodwill

Total expenses

Loss from operations

Other income, net

Loss before income taxes

Provision (benefit) for income taxes

Net loss

Comparison of the Years Ended December 31, 2018 and 2017

Revenue

Year Ended

December 31, 2018

December 31, 2017

100 %

100 %

48

36

30

34

3

—

—

151

(51)

(1)

(50)

—

37

33

30

36

4

3

58

201

(101)

—

(101)

(1)

(50)%

(100) %

Revenue decreased $30.9 million, or 20%, for the year ended December 31, 2018 compared to the prior year primarily 
due to the reduction and then elimination of our buyer fees in 2017, market and competitive pressures, deceleration in traditional 
desktop display spending, and header bidding dynamics as described above in "Industry Trends and Trends in Our Business". 

Revenue is impacted by shifts in the mix of advertising spend by transaction type and channel, changes in the fees we 

charge buyers and sellers for our services, and other factors such as changes in the market, our execution of the business, and 
competition. In addition to the decrease in revenue due to the elimination of buyer transaction fees, an increase in PMP transactions 
as a percentage of the transactions on our platform could also result in reduced revenue, if not offset by increased volume, because 
PMP transactions can carry lower fees than OMP transactions. In late 2018, we began to see some pressure on desktop CPMs, 
which has now carried over to mobile CPMs, as a result of buyer pricing tools and the impact from privacy initiatives, such as 
Apple’s ITP, that drive a higher mix of contextual versus behavioral impressions being sold. We believe that better pricing has 
helped advertising campaigns' return on investment and is driving significant increases in paid impressions, but it has decreased 
advertising spend and corresponding revenue, and could eliminate or reduce potential revenue growth in 2019. Industry dynamics 
are challenging due to market and competitive pressures and make it difficult to predict the near-term effect of our growth 
initiatives. While we anticipate long-term benefits from these initiatives, unless we are able to continue to increase advertising 
spend on our platform, through higher transaction volumes or higher transaction values or both, our revenue will continue to 
fluctuate and our growth may be limited.

Cost of Revenue 

Cost of revenue increased $3.2 million, or 6%, for the year ended December 31, 2018 compared to the prior year. The 
increase was primarily due to an increase of $3.6 million in data center and bandwidth expenses to support the increase in our 
transaction volume, as well as an increase of $1.3 million in depreciation and amortization expenses related to continued 
investment in our network technology infrastructure to keep up with impression demand. These increases were partially offset by a 
$1.0 million reduction in media costs related to the cessation of our intent marketing solution during the first quarter of 2017 and a 
$0.3 million decrease in personnel costs. 

We expect cost of revenue to be higher in absolute dollars in 2019 compared to 2018 as a result of increased spending on 
data centers, serving costs, and technology to process the greater volumes of data and transactions we will need to grow revenue. 
Cost of revenue may fluctuate from quarter to quarter and period to period, on an absolute dollar basis and as a percentage of 
revenue, depending on revenue levels and the volume of transactions we process supporting those revenues, and the timing and 
amounts of depreciation and amortization of equipment and software.

59

Sales and Marketing 

Sales and marketing expenses decreased $7.2 million, or 14%, for the year ended December 31, 2018 compared to the 

prior year. The decrease is attributable to our 2017 and 2018 cost reduction measures, including the realignment of our 
management team, primarily including a $3.9 million decrease in personnel costs as well as decreases across other expenses 
necessary to support our reduced headcount. In addition, certain sales and marketing expenses have decreased due to our cost 
reduction measures, including subscription costs and travel-related costs, which collectively decreased $1.0 million in 2018. Sales 
and marketing professional services costs also decreased $0.9 million compared to 2017. 

We expect sales and marketing expenses to remain relatively flat in 2019 compared to 2018 as we continue to maintain 

reduced cost levels that were established and achieved in 2018, described below. Sales and marketing expense may fluctuate 
quarter to quarter and period to period, on an absolute dollar basis and as a percentage of revenue, based on revenue levels, the 
timing of our investments and seasonality in our industry and business.

Technology and Development 

Technology and development expenses decreased by $9.6 million, or 20%, for the year ended December 31, 2018 

compared to the prior year, primarily due to a decrease of $7.4 million in personnel costs as a result of our 2017 and 2018 cost 
control initiatives. In addition, depreciation and amortization expenses decreased $1.1 million compared to 2017 primarily due to 
the cessation of our intent marketing services offering and closure of our Toronto office in the first quarter of 2017.  

We expect technology and development expense to increase slightly in 2019 compared to 2018 as we make a limited 

number of strategic and targeted headcount additions to focus on the engineering aspect of our new developments, including tools 
for our sellers. The timing and amount of our capitalized development and enhancement projects may affect the amount of 
development costs expensed in any given period. As a percentage of revenue, technology and development expense may fluctuate 
from quarter to quarter and period to period based on revenue levels, the timing and amounts of these investments, the timing and 
the rate of the amortization of capitalized projects and the timing and amounts of future capitalized internal use software 
development costs.

General and Administrative 

General and administrative expenses decreased by $13.2 million, or 24%, for the year ended December 31, 2018 
compared to the prior year. The decrease was primarily attributable to a $7.4 million decrease in personnel related expenses due to 
a decrease in employee headcount as a result of our 2017 and 2018 cost control initiatives, as well as decreases across other 
expenses necessary to support our reduced headcount. Professional service expenses also decreased $3.2 million, largely due to 
reduced legal fees and consultant services. General and administrative depreciation and amortization costs also decreased $0.7 
million due to accelerated amortization of certain capitalized software assets in 2017. 

We expect general and administrative expenses to decrease in 2019 compared to 2018 as the cost savings realized in the 
second half of 2018 have a larger impact on our expected results. General and administrative expenses may fluctuate from quarter 
to quarter and period to period based on the timing and amounts of our investments and related expenditures in our general and 
administrative functions as they vary in scope and scale over periods which may not be directly proportional to changes in revenue.

Restructuring and Other Exit Costs

We incurred restructuring and other exit costs of $3.4 million for severance and other one-time employee termination 

benefits during the year ended December 31, 2018 related to headcount reductions that were made in the first quarter of 2018, as 
described below. For the year ended December 31, 2017, we incurred $6.0 million of restructuring and one-time termination 
benefits expenses, primarily in severance and one-time employee termination benefits and facility closure costs, as a result of the 
management restructuring and the costs associated with the shut-down of our intent marketing services (see Note 14). 

As part of our on-going evaluation of efficiency and implementation of cost-control measures, during the first quarter of 

2018 we undertook measures to reduce headcount by approximately 100 people, or 19% of our workforce, and to reduce other 
operating costs. Our actions included reductions in administrative staff to bring our general and administrative operations into 
better alignment with the current size of the business, as well as in sales and technical personnel as a result of offshoring certain 
development functions, organizational delayering and restructuring, and reducing investment in unprofitable projects. We estimated 
the 2018 restructuring activities would result in annualized cash basis cost savings of approximately $24.0 million. For the year 
ended December 31, 2018, we met our target for operating expense reductions.

For the year ended December 31, 2017, we recognized expenses of $6.0 million as restructuring and other exit costs 

related to the cessation of our intent marketing solution, including the closure of the Toronto office, as well as the realignment of 

60

the management team to a more cost-efficient structure. These expenses primarily related to one-time employee termination 
benefits, and included $4.4 million of cash expenditures. Restructuring expenses of $5.1 million were paid in 2017, which included 
restructuring costs incurred in 2016 and 2017 related to this restructuring plan. The remaining liability as of December 31, 2017 
was paid in 2018.

Other (Income) Expense, Net 

Interest income, net

Other income

Foreign exchange (gain) loss, net

Total other income, net

Year Ended

December 31, 2018

December 31, 2017

$

$

(in thousands)
(988) $
(766)
(389)
(2,143) $

(908)

(688)

1,165

(431)

Foreign exchange (gain) loss, net is impacted by movements in exchange rates, primarily the British Pound and the Euro 
relative to the U.S. Dollar, and the amount of foreign currency-denominated receivables and payables, which are impacted by our 
billings to buyers and payments to sellers. The foreign currency gain, net during the year ended December 31, 2018 was primarily 
attributable to the strengthening of the U.S. Dollar in relation to the Euro and the British Pound for foreign currency denominated 
transactions. 

Provision for Income Taxes 

We recorded an income tax expense of $0.4 million for the year ended December 31, 2018 compared to an income tax 

benefit of $1.8 million for the year ended December 31, 2017. The tax provision for the year ended December 31, 2018 is primarily 
the result of the domestic valuation allowance and the tax liability associated with foreign subsidiaries.

Non-GAAP Financial Measures

In addition to our GAAP results, we review certain non-GAAP financial measures to help us evaluate our business, 
measure our performance, identify trends affecting our business, establish budgets, measure the effectiveness of investments in our 
technology and development and sales and marketing, and assess our operational efficiencies. These non-GAAP measures include 
advertising spend, non-GAAP net revenue, and Adjusted EBITDA, which are discussed immediately following the table below, 
along with the operational performance measure take rate. Although we historically provided advertising spend and take rate as key 
performance metrics on a quarterly basis, we have determined that we will share specific metrics in these areas on an annual basis 
going forward. These metrics were historically more important when we had GAAP revenue that was reported on both a gross and 
a net basis prior to early 2017. More recently, they were important given our removal of buyer fees in late 2017, which 
significantly lowered our take rate, and made it challenging to understand our business during that time of significant transition. 
 Given that these informational needs are lessened, competitive sensitivities, and in particular given that the comparison year for 
the significant take rate change is behind us, we believe now is an appropriate time to make this change. Revenue and other GAAP 
measures are discussed under the headings "Components of Our Results of Operations" and "Results of Operations". 

Financial Measures and non-GAAP Financial Measures:

Revenue

Advertising spend

Non-GAAP net revenue

Net loss

Adjusted EBITDA
Operational Measure:

Take Rate %

61

Year Ended

December 31, 2018

December 31, 2017

(in thousands)

$

$

$

$

$

124,685

992,087

124,685
(61,822)
(11,222)

$

$

$

$

$

155,545

837,221

154,928

(154,783)

(4,420)

12.6%

18.5%

Advertising Spend 

We define advertising spend as the total volume of spending between buyers and sellers transacted on our platform. 

Advertising spend does not represent revenue reported on a GAAP basis. We also use advertising spend for internal management 
purposes to assess market share of total advertising spending. As discussed above, we no longer expect to present our advertising 
spend on a quarterly basis beginning in 2019.

Our advertising spend may be influenced by demand for our services, the volume and characteristics of paid impressions, 

average CPM, our ability to fill ad requests, the nature and amount of fees we charge, and other factors such as changes in the 
market, our execution of the business, and competition. 

Advertising spend may fluctuate due to seasonality. In the past, we have experienced higher advertising spend during the 
fourth quarter of a given year because many buyers devote a disproportionate amount of their advertising budgets to this period of 
the year to coincide with increased holiday purchasing. Buyers' focus on the fourth quarter generates more bidding activity on our 
platform, which may drive higher volumes of paid impressions, average CPM, or both. Our advertising spend grew 18% for the 
year ended December 31, 2018 compared to 2017. The increase in advertising spend was driven by higher ad request volumes and 
an increase in the CPMs generated from our auctions. The increase in CPMs was driven by increased bidding activity on our 
platform, the value of the inventory that we made available to buyers, including PMP, mobile and video inventory that typically 
carries higher pricing, and auction dynamics, including the implementation of first price auctions and EMR for our header bidding 
inventory. 

The following table presents the reconciliation of revenue to advertising spend: 

Revenue

Plus amounts paid to sellers(1)

Advertising spend

(1) Amounts paid to sellers for the portion of our revenue reported on a net basis for GAAP purposes.

Year Ended

December 31, 2018

December 31, 2017

$

$

(in thousands)

124,685

867,402

992,087

$

$

155,545

681,676

837,221

Our solution enables buyers and sellers to transact through desktop and mobile channels. The following tables present 
revenue and advertising spend in dollar terms by channel and as a percentage of total revenue or advertising spend for the years 
ended December 31, 2018 and 2017. 

Revenue

Year Ended

Advertising Spend

Year Ended

December 31, 2018

December 31, 2017

December 31, 2018

December 31, 2017

(in thousands, except percentages)

Channel:

Desktop

Mobile

Total

$ 59,039

65,646

47% $ 84,327

53

71,218

54% $ 477,900

46

514,187

48% $ 475,258

52

361,963

$ 124,685

100% $ 155,545

100% $ 992,087

100% $ 837,221

57%

43

100%

Non-GAAP Net Revenue 

We define non-GAAP net revenue as GAAP revenue less amounts we pay sellers, where the amounts paid are included 

within cost of revenue for the portion of our revenue reported on a gross basis. The portion of our revenue reported on a gross basis 
was attributable to intent marketing services, which no longer generated revenue after the first quarter of 2017. Historically, non-
GAAP net revenue was a useful measure in assessing the performance of our business in periods for which our revenue included 
revenue reported on a gross basis, because it showed the operating results of our business on a consistent basis without the effect of 
differing revenue reporting (gross vs. net) that we applied under GAAP across different types of transactions, and facilitated 
comparison of our results to the results of companies that report all of their revenue on a net basis. Revenue from intent marketing 
services in the first quarter of 2017 created the difference between our non-GAAP net revenue and our GAAP revenue for that 
period. We ceased offering our intent marketing solution in the first quarter of 2017, so for subsequent periods non-GAAP net 
revenue is the same as GAAP revenue, as there is no longer a reconciling item between GAAP and non-GAAP net revenue. Non-
GAAP net revenue is presented for comparative purposes as the first quarter of 2017 still included the intent marketing solution 
reconciling item. 

62

A potential limitation of non-GAAP net revenue is that other companies may define non-GAAP net revenue differently, 

which may make comparisons difficult.

Non-GAAP net revenue is influenced by the volume and characteristics of advertising spend and our take rate. The 

revenue we have reported on a gross basis was associated with our intent marketing business. Because we exited that business in 
the first quarter of 2017, we do not expect to report any revenue on a gross basis after the first quarter of 2017 unless and until we 
change our business practices, develop new products, or make an acquisition, in each case with characteristics that require gross 
reporting.

The following table presents a reconciliation of revenue to non-GAAP net revenue for the years ended December 31, 2018 

and 2017.

Revenue

Less amounts paid to sellers(1)

Non-GAAP net revenue

Year Ended

December 31, 2018

December 31, 2017

$

$

(in thousands)

124,685
—
124,685

$

$

155,545
617
154,928

(1)

Represents amounts paid to sellers included within cost of revenue.

Non-GAAP net revenue decreased in the current period compared to the prior year due to a lower take rate, as noted

within "Industry Trends and Trends in Our Business", which was partially offset by the increase in advertising spend.

Adjusted EBITDA 

We define Adjusted EBITDA as net income (loss) adjusted to exclude stock-based compensation expense, depreciation 
and amortization, amortization of acquired intangible assets, impairment charges, interest income or expense, and other cash and 
non-cash based income or expenses that we do not consider indicative of our core operating performance, including, but not 
limited to foreign exchange gains and losses, acquisition and related items, and provision (benefit) for income taxes. We believe 
Adjusted EBITDA is useful to investors in evaluating our performance for the following reasons:

•

•

•

Adjusted EBITDA is widely used by investors and securities analysts to measure a company’s performance without regard
to items such as those we exclude in calculating this measure, which can vary substantially from company to company
depending upon their financing, capital structures, and the method by which assets were acquired.

Our management uses Adjusted EBITDA in conjunction with GAAP financial measures for planning purposes, including
the preparation of our annual operating budget, as a measure of performance and the effectiveness of our business
strategies, and in communications with our board of directors concerning our performance. Adjusted EBITDA may also
be used as a metric for determining payment of cash incentive compensation.

Adjusted EBITDA provides a measure of consistency and comparability with our past performance that many investors
find useful, facilitates period-to-period comparisons of operations, and also facilitates comparisons with other peer
companies, many of which use similar non-GAAP financial measures to supplement their GAAP results.

Although Adjusted EBITDA is frequently used by investors and securities analysts in their evaluations of companies, Adjusted 
EBITDA has limitations as an analytical tool, and should not be considered in isolation or as a substitute for analysis of our results 
of operations as reported under GAAP. These limitations include:

•

•

•

•

•

Stock-based compensation is a non-cash charge and is and will remain an element of our long-term incentive
compensation package, although we exclude it as an expense in Adjusted EBITDA when evaluating our ongoing
operating performance for a particular period.

Depreciation and amortization are non-cash charges, and the assets being depreciated or amortized will often have to be
replaced in the future, but Adjusted EBITDA does not reflect any cash requirements for these replacements.

Impairment charges are non-cash charges related to the write-down of goodwill, intangible assets and/or long-lived assets,
although we exclude these charges as expenses in Adjusted EBITDA when evaluating our ongoing operating performance
for a particular period.

Adjusted EBITDA does not reflect non-cash charges related to acquisition and related items, such as amortization of
acquired intangible assets and changes in the fair value of contingent consideration.

Adjusted EBITDA does not reflect cash and non-cash charges and changes in, or cash requirements for, acquisition and
related items, such as certain transaction expenses and expenses associated with earn-out amounts.

63

•

•

•

Adjusted EBITDA does not reflect changes in our working capital needs, capital expenditures, or contractual
commitments.

Adjusted EBITDA does not reflect cash requirements for income taxes and the cash impact of other income or expense.

Other companies may calculate Adjusted EBITDA differently than we do, limiting its usefulness as a comparative
measure.

Our Adjusted EBITDA is influenced by fluctuation in our revenue and the timing and amounts of our investments in our

operations. 

The following table presents a reconciliation of net loss, the most comparable GAAP measure, to Adjusted EBITDA for 

the years ended December 31, 2018 and 2017.

Net loss
Add back (deduct):

Depreciation and amortization expense, excluding amortization of acquired
intangible assets

   Amortization of acquired intangibles
   Stock-based compensation expense

Impairment of intangible assets and internal use software
Impairment of goodwill

   Acquisition and related items

Interest income, net
Foreign exchange (gain) loss, net
Provision (benefit) for income taxes

Adjusted EBITDA

Year Ended

December 31, 2018

December 31, 2017

(in thousands)

$

(61,822) $

(154,783)

32,153
3,185
16,282
—
—
—
(988)
(389)
357
(11,222) $

31,443
4,782
20,504
4,585
90,251
303
(908)
1,165
(1,762)
(4,420)

$

The decline in adjusted EBITDA for the year ended December 31, 2018 and our expectations for future adjusted EBITDA 

have been driven by the same factors that drove the changes in our GAAP metrics noted above. 

Take Rate 

Take rate is an operational performance measure calculated by dividing revenue (or for periods in which we have revenue 
reported on a gross basis, non-GAAP net revenue) by advertising spend. We review take rate for internal management purposes to 
assess the development of our marketplace with buyers and sellers. As discussed above, we no longer expect to present our take 
rate on a quarterly basis beginning in 2019.

Our take rate (and our fees, which drive take rate) can be affected by a variety of factors, including the terms of our 

arrangements with buyers and sellers active on our platform in a particular period, the scale of a buyer’s or seller’s activity on our 
platform, mix of inventory types, the implementation of new products, platforms and solution features, auction dynamics, 
competitive factors, our strategic pricing decisions, credits for discrepancies and other items, and the overall development of the 
digital advertising ecosystem. 

The significant declines in our take rates for the year ended December 31, 2018 compared to 2017 resulted primarily from 

the reduction and elimination of buyer fees as discussed above in "Industry Trends and Trends in Our Business—Take Rate 
Decline". Subsequent to the elimination of buyer fees, take rates have stabilized and increased slightly. 

Liquidity and Capital Resources

Our principal sources of liquidity are our cash and cash equivalents, marketable securities, cash generated from 
operations, and our credit facility with Silicon Valley Bank ("SVB"). At December 31, 2018, we had cash and cash equivalents of 
$80.5 million, of which $20.1 million was held in foreign currency cash accounts, and marketable securities of $7.5 million. Our 
cash and marketable securities balances are affected by our results of operations, the timing of capital expenditures, which are 
typically greater in the second half of the year, and by changes in our working capital, particularly changes in accounts receivable 
and accounts payable. The timing of cash receipts from buyers and payments to sellers can significantly impact our cash flows 
from operating activities and our liquidity for, and within, any period presented. Our collection and payment cycle can vary from 
period to period depending upon various circumstances, including seasonality. 

64

On September 26, 2018, we amended and restated our loan and security agreement with SVB (the "Loan Agreement"), 

which was scheduled to expire on September 27, 2018. The Loan Agreement provides a senior secured revolving credit facility of 
up to $40.0 million with a maturity date of September 26, 2020. The amount available for borrowing as of December 31, 2018 is 
$30.0 million due to a $10.0 million reserve that will be released if we maintain positive Adjusted EBITDA for any trailing 
twelve-month period.  

An unused revolver fee in the amount of 0.15% per annum of the average unused portion of the revolver line is charged 

and is payable monthly in arrears. We may elect for advances to bear interest calculated by reference to prime or LIBOR. If we 
elect LIBOR, amounts outstanding under the amended credit facility bear interest at a rate per annum equal to LIBOR plus 2.50% 
if a streamline period applies or LIBOR plus 4.00% if a streamline period does not apply. If we elect prime, advances bear interest 
at a rate of prime plus 0.50% if a streamline period applies or prime plus 2.00% if a streamline period does not apply. A 
streamline period is any period during which an event of default does not exist and our Adjusted Quick Ratio (as defined in the 
Loan Agreement) is at least 1.05 for each day in the preceding month.

The Loan Agreement is collateralized by security interests in substantially all of our assets. Subject to certain exceptions, 

the Loan Agreement restricts our ability to, among other things, pay dividends, sell assets, make changes to the nature of the 
business, engage in mergers or acquisitions, incur, assume or permit to exist, additional indebtedness and guarantees, create or 
permit to exist, liens, make distributions or redeem or repurchase capital stock, or make other investments, engage in transactions 
with affiliates, make payments with respect to subordinated debt, and enter into certain transactions without the consent of the 
financial institution. If a streamline period is not in effect, we are required to maintain a lockbox arrangement where client 
payments received in the lockbox will immediately reduce the amounts outstanding on the credit facility.

The Loan Agreement requires us to comply with financial covenants, including a minimum Adjusted Quick Ratio and 

the achievement of certain Adjusted EBITDA targets. On a monthly basis, or quarterly if there were no advances outstanding 
during the calendar quarter, we are required to maintain a minimum Adjusted Quick Ratio of: (i) 1.00 if the trailing six month 
adjusted EBITDA is $0 or less, or (ii) 0.90 if the trailing six month adjusted EBITDA is greater than $0. If our Adjusted Quick 
Ratio is 1.05 or greater, a streamline period applies. As of December 31, 2018, our Adjusted Quick Ratio was 1.16, which is in 
compliance with the covenant requirement and is higher than the minimum Adjusted Quick Ratio required to qualify for a 
streamline period. We must also maintain trailing twelve month Adjusted EBITDA targets as of the end of each quarter as 
follows: (1) September 30, 2018 through June 30, 2019 Adjusted EBITDA must be within 20% of the Adjusted EBITDA 
projections that were delivered to Silicon Valley Bank; (2) September 30, 2019 Adjusted EBITDA of $1 or greater; and (3) 
December 31, 2019 and thereafter, Adjusted EBITDA of $5.0 million or greater.

The Loan Agreement also includes customary representations and warranties, affirmative covenants, and events of 

default, including events of default upon a change of control and material adverse change (as defined in the Loan Agreement). 
Following an event of default, SVB would be entitled to, among other things, accelerate payment of amounts due under the credit 
facility and exercise all rights of a secured creditor.

At December 31, 2018, we had no amounts outstanding under our Loan Agreement with SVB. Future availability under 

the credit facility is dependent on several factors including the available borrowing base and compliance with future covenant 
requirements. 

We believe our existing cash and cash equivalents and investment balances will be sufficient to meet our working capital 
requirements for at least the next twelve months from the issuance of our financial statements. However, we typically collect from 
buyers in advance of payments to sellers, and our collection and payment cycle can vary from period to period depending upon 
various circumstances, including seasonality. Increases in revenue earned directly from advertisers and agencies may cause the 
amount of receipts from buyers collected in advance of payments to sellers to decrease, because advertisers and agencies may pay 
slowly. Recently, some buyers have begun demanding longer terms to pay us later and some sellers have begun demanding 
shorter terms to collect from us earlier. We may not have the leverage to resist these demands given the competitive nature of our 
business. If this continues, more of our cash will be required to fund our payment cycle and therefore not available for other uses. 
Our future capital requirements and the adequacy of available funds will depend on many factors, including those set forth in Part 
I, Item 1A: "Risk Factors" of this Annual Report on Form 10-K.

Our ability to renew our existing credit facility, which matures in September 2020, or to enter into a new credit facility to 
replace or supplement the existing facility may be limited due to various factors, including the status of our business, global credit 
market conditions, and perceptions of our business or industry by sources of financing. In particular, it may be difficult to renew 
or replace our existing credit facility if we are not able to produce, or demonstrate a path to produce, positive cash flow. In 
addition, even if credit is available, lenders may seek more restrictive covenants and higher interest rates that may reduce our 
borrowing capacity, increase our costs, and reduce our operating flexibility.

In the future, we may attempt to raise additional capital through the sale of equity securities or through equity-linked or 

debt financing arrangements. If we raise additional funds by issuing equity or equity-linked securities, the ownership of our 
existing stockholders will be diluted. If we raise additional financing by incurring indebtedness, we will be subject to increased 

65

fixed payment obligations and could also be subject to restrictive covenants, such as limitations on our ability to incur additional 
debt, and other operating restrictions that could adversely impact our ability to conduct our business. Any future indebtedness we 
incur may result in terms that could be unfavorable to equity investors. 

An inability to raise additional capital could adversely affect our ability to achieve our business objectives. In addition, if 

our operating performance during the next twelve months is below our expectations, our liquidity and ability to operate our 
business could be adversely affected. 

Cash Flows

The following table summarizes our cash flows for the periods presented: 

Cash flows provided by (used in) operating activities

Cash flows provided by (used in) investing activities

Cash flows used in financing activities

Effects of exchange rate changes on cash, cash equivalents and restricted cash

Change in cash, cash equivalents and restricted cash

Operating Activities 

Year Ended

December 31, 2018

December 31, 2017

(in thousands)

$

$

(22,686) $
27,947
(1,279)
(172)
3,810

$

21,535

(93,210)

(1,380)

199

(72,856)

Our cash flows from operating activities are primarily driven by revenues generated from advertising activity, offset by 
the cash costs of operations, and significantly influenced by increases or decreases in receipts from buyers and related payments 
to sellers. Our future cash flows will be diminished if we cannot increase our revenue levels and manage costs appropriately. Cash 
flows from operating activities have been further affected by changes in our working capital, particularly changes in accounts 
receivable and accounts payable. The timing of cash receipts from buyers and payments to sellers can significantly impact our 
cash flows from operating activities for any period presented. 

For the year ended December 31, 2018, net cash used in operating activities was $22.7 million, compared to net cash 

provided by operating activities of $21.5 million for the year ended December 31, 2017. Our operating activities included our net 
losses of $61.8 million and $154.8 million for the years ended December 31, 2018 and 2017, respectively, which were offset by 
non-cash adjustments of $51.3 million and $151.5 million, respectively. Non-cash adjustments for the year ended December 31, 
2017 included $90.3 million and $4.6 million of impairment charges related to goodwill and intangible assets and internally 
developed software, respectively. In 2018, net changes in our working capital increased cash used in operating activities by $12.1 
million. Net cash provided by operating activities for 2017 was also increased by net changes in our working capital of $24.8 
million. The net changes in working capital for both periods are primarily due to the timing of cash receipts from buyers and the 
timing of payments to sellers. 

We believe that cash flows from operations will continue to be negatively impacted by our ongoing net losses and 

working capital needs.

Investing Activities 

Our primary investing activities have consisted of investments in, and maturities of, available-for-sale securities, 
acquisitions of businesses, purchases of property and equipment, and capital expenditures to develop our internal use software in 
support of creating and enhancing our technology infrastructure. Purchases of property and equipment and investments in internal 
use software development may vary from period-to-period due to the timing of the expansion of our operations, changes to 
headcount, and the cycles of our internal use software development. As we execute on our strategy to be a high volume, low cost 
advertising exchange, we are developing solutions to manage the growth of our digital advertising inventory volume more 
efficiently. As the business continues to grow, we expect our investment in property and equipment to slightly increase compared 
to 2018. We anticipate investment in internal use software development to remain relatively consistent with past years' investment 
levels as we continue to innovate new solutions on our platform. Investments in, and maturities of, available-for-sale securities 
and acquisitions of businesses vary from period-to-period.

During the year ended December 31, 2018, net cash provided by investing activities was $27.9 million, compared to net 
cash used in investing activities of $93.2 million for the year ended December 31, 2017. Net cash used in our investing activities 
in 2017 included $38.6 million of cash consideration, net of cash acquired, to acquire nToggle, Inc. in July 2017. For the year 
ended December 31, 2018 we had net maturities of available-for-sale securities of $38.7 million compared to net purchases of 
available for sale securities of $14.2 million for the year ended December 31, 2017. The year ended December 31, 2018 also 
included cash inflows of $9.2 million from sales of our available-for-sale securities. These cash inflows were offset by purchases 

66

of property and equipment of $11.4 million and $32.4 million during 2018 and 2017, respectively, which included costs to 
integrate nToggle into our platform in 2017. We also made investments in our internally developed software of $8.5 million and 
$8.0 million during the year ended December 31, 2018 and 2017, respectively.

Financing Activities

Our financing activities consisted of transactions related to the issuance of our common stock under our equity plans. 

For the years ended December 31, 2018 and 2017, we used net cash of $1.3 million and $1.4 million, respectively, for 

financing activities. Cash outflows from financing activities for the years ended December 31, 2018 and 2017 included payments 
of $1.6 million and $2.4 million, respectively, for income tax deposits paid in respect of vesting of stock-based compensation 
awards that were reimbursed by the award recipients through surrender of shares. Offsetting these outflows were cash inflows of 
$0.3 million and $0.6 million from the issuance of common stock under the employee stock purchase plan for the years ended 
December 31, 2018 and 2017, respectively. 

Off-Balance Sheet Arrangements 

We do not have any relationships with other entities or financial partnerships, such as entities often referred to as structured 

finance or special purpose entities that have been established for the purpose of facilitating off-balance sheet arrangements or other 
contractually narrow or limited purposes. We did not have any other off-balance sheet arrangements at December 31, 2018 other 
than the operating leases and the indemnification agreements described below. 

Contractual Obligations and Known Future Cash Requirements

Our principal commitments consist of leases for our various office facilities, including our corporate headquarters in Los 
Angeles, California, and non-cancelable operating lease agreements with data centers that expire at various times through 2024. At 
December 31, 2018, expected future commitments relating to operating leases were $14.0 million. See Note 16 of "Notes to 
Consolidated Financial Statements" for our annual lease commitment for each of the next five years and thereafter. In certain cases, 
the terms of the lease agreements provide for rental payments on a graduated basis. We received rental income from subleases 
totaling $0.8 million for the year ended December 31, 2018.

There were no significant changes to our unrecognized tax benefits in the year ended December 31, 2018 and we do not 

expect to have any significant changes to unrecognized tax benefits through December 31, 2019.

In the ordinary course of business, we enter into agreements with sellers, buyers, and other third parties pursuant to which 

we agree to indemnify buyers, sellers, vendors, lessors, business partners, lenders, stockholders, and other parties with respect to 
certain matters, including, but not limited to, losses resulting from claims of intellectual property infringement, damages to property 
or persons, business losses, or other liabilities. Generally, these indemnity and defense obligations relate to our own business 
operations, obligations, and acts or omissions. However, under some circumstances, we agree to indemnify and defend contract 
counterparties against losses resulting from their own business operations, obligations, and acts or omissions, or the business 
operations, obligations, and acts or omissions of third parties. These indemnity provisions generally survive termination or 
expiration of the agreements in which they appear. In addition, we have entered into indemnification agreements with our directors, 
executive officers and certain other officers that will require us, among other things, to indemnify them against certain liabilities that 
may arise by reason of their status or service as directors, officers, or employees. No demands for indemnification have been made 
as of December 31, 2018.

Critical Accounting Policies and Estimates

Our consolidated financial statements are prepared in accordance with GAAP. The preparation of these consolidated 

financial statements requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue, 
expenses, and related disclosures. We evaluate our estimates and assumptions on an ongoing basis. Our estimates are based on 
historical experience and various other assumptions that we believe to be reasonable under the circumstances. Our actual results 
could differ from these estimates.

We believe that the accounting policies disclosed below include estimates and assumptions critical to our business and their 

application could have a material impact on our consolidated financial statements. In addition to these critical policies, our 
significant accounting policies are included within Note 2 of our "Notes to Consolidated Financial Statements" within this Annual 
Report on Form 10-K.

Revenue Recognition 

We generate revenue from transactions where we provide a platform for the purchase and sale of digital advertising 

inventory. Our advertising automation solution is a marketplace that includes sellers of inventory (providers of websites, mobile 
applications and other digital media properties, and their representatives) and buyers of inventory (including advertisers, agencies, 
agency trading desks, and demand-side platforms). This solution incorporates proprietary machine-learning algorithms, 

67

sophisticated data processing, high-volume storage, detailed analytics capabilities, and a distributed infrastructure. Together, these 
features form the basis for our automated advertising solution that brings buyers and sellers together and facilitates intelligent 
decision-making and automated transaction execution for the digital advertising inventory managed on our platform. Digital 
advertising inventory is created when consumers access sellers’ content. Sellers provide digital advertising inventory to our platform 
in the form of advertising requests, or ad requests. When we receive ad requests from sellers, we send bid requests to buyers, which 
enable buyers to bid on sellers’ digital advertising inventory. Winning bids can create advertising, or paid impressions, for the seller 
to present to the consumer. 

The total volume of spending between buyers and sellers on our platform is referred to as advertising spend. We keep a 

percentage of that advertising spend as a fee, and remit the remainder to the seller. The fee that we retain from the gross advertising 
spend on our platform is recognized as revenue. The fee earned on each transaction is based on the pre-existing agreement we have 
with the seller and the clearing price of the winning bid. We recognize revenue upon fulfillment of our performance obligation to a 
client, which occurs at the point in time an ad renders and is counted as a paid impression, subject to a contract existing with the 
client and a fixed or determinable transaction price. Performance obligations for all transactions are satisfied, and the corresponding 
revenue is recognized, at a distinct point in time; we have no arrangements with multiple performance obligations. We consider the 
following when determining if a contract exists (i) contract approval by all parties, (ii) identification of each party’s rights regarding 
the goods or services to be transferred, (iii) specified payment terms, (iv) commercial substance of the contract, and (v) 
collectability of substantially all of the consideration is probable.  

We have determined that we do not act as the principal in the purchase and sale of digital advertising inventory because we 

are not the primary obligor and do not set prices agreed upon within the auction marketplace, and therefore we report revenue on a 
net basis. In periods prior to the second quarter of 2017, we reported revenue on a gross basis for revenue associated with our intent 
marketing solution, as we determined that we acted as the principal in the purchase and sale of digital advertising inventory. We 
ceased offering our intent marketing solution after the first quarter of 2017, after which time, all of our revenues have been recorded 
on a net basis.

Impairment of Long-Lived Assets, including Intangible Assets and Internal Use Capitalized Software Costs

We assess the recoverability of our long-lived assets when events or changes in circumstances indicate their carrying value 
may not be recoverable. Such events or changes in circumstances may include: a significant adverse change in the extent or manner 
in which a long-lived asset is being used, significant adverse change in legal factors or in the business climate that could affect the 
value of a long-lived asset, an accumulation of costs significantly in excess of the amount originally expected for the acquisition or 
development of a long-lived asset, current or future operating or cash flow losses that demonstrate continuing losses associated with 
the use of a long-lived asset, or a current expectation that, more likely than not, a long-lived asset will be sold or otherwise disposed 
of significantly before the end of its previously estimated useful life. We perform impairment testing at the asset group level that 
represents the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities. 
We assess recoverability of a long-lived asset by determining whether the carrying value of the asset group can be recovered 
through projected undiscounted cash flows over their remaining lives. If the carrying value of the asset group exceeds the forecasted 
undiscounted cash flows, an impairment loss is recognized, measured as the amount by which the carrying amount exceeds 
estimated fair value. An impairment loss is charged to operations in the period in which management determines such impairment.

Recently Issued Accounting Pronouncements

For information regarding recent accounting pronouncements, refer to Note 2 of our "Notes to Consolidated Financial 

Statements" within this Annual Report on Form 10-K.

Item 7A. Quantitative and Qualitative Disclosure About Market Risk

This section is not required for smaller reporting companies.

68

Item 8. Financial Statements and Supplementary Data

The Rubicon Project, Inc.

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

Report of Independent Registered Public Accounting Firm
Report of Independent Registered Public Accounting Firm

Consolidated Financial Statements:
Consolidated Balance Sheets
Consolidated Statements of Operations
Consolidated Statements of Comprehensive Income (Loss)
Consolidated Statements of Stockholders' Equity
Consolidated Statements of Cash Flows
Notes to Consolidated Financial Statements

70
71

72
73
74
75
76
77

69

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the stockholders and the Board of Directors of The Rubicon Project, Inc.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheet of The Rubicon Project, Inc. and subsidiaries (the "Company") 
as of December 31, 2018, the related consolidated statements of operations, comprehensive income (loss), stockholders' equity, 
and cash flows, for the year ended December 31, 2018, and the related notes (collectively referred to as the "financial 
statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of the 
Company as of December 31, 2018, and the results of its operations and its cash flows for the year ended December 31, 2018, 
in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on 
the Company's financial statements based on our audit. We are a public accounting firm registered with the Public Company 
Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in 
accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange 
Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the 
audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to 
error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over 
financial reporting. As part of our audit, we are required to obtain an understanding of internal control over financial reporting 
but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial reporting. 
Accordingly, we express no such opinion.

Our audit included performing procedures to assess the risks of material misstatement of the financial statements, whether due 
to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, 
evidence regarding the amounts and disclosures in the financial statements. Our audit also included evaluating the accounting 
principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial 
statements. We believe that our audit provides a reasonable basis for our opinion.

/s/ Deloitte & Touche LLP

Los Angeles, CA

February 27, 2019

We have served as the Company's auditor since 2018.

70

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of The Rubicon Project, Inc.

Opinion on the Financial Statements 

We have audited the consolidated balance sheet of The Rubicon Project, Inc. and its subsidiaries (the “Company”) as of December 
31, 2017, and the related consolidated statements of operations, comprehensive income (loss), stockholders’ equity (deficit) and 
cash flows for the year ended December 31, 2017, including the related notes (collectively referred to as the “consolidated financial 
statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the 
Company as of December 31, 2017, and the results of its operations and its cash flows for the year ended December 31, 2017 in 
conformity with accounting principles generally accepted in the United States of America.    

Basis for Opinion 

These consolidated financial statements are the responsibility of the Company's management. Our responsibility is to express an 
opinion on the Company’s consolidated financial statements based on our audits. We are a public accounting firm registered with 
the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the 
Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange 
Commission and the PCAOB.  

We conducted our audits of these consolidated financial statements in accordance with the standards of the PCAOB. Those 
standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated financial 
statements are free of material misstatement, whether due to error or fraud.

Our audits included performing procedures to assess the risks of material misstatement of the consolidated financial statements, 
whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test 
basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating 
the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the 
consolidated financial statements. We believe that our audits provide a reasonable basis for our opinion. 

/s/ PricewaterhouseCoopers LLP

Los Angeles, California

March 14, 2018

We served as the Company's auditor from 2012 to 2018.

71

THE RUBICON PROJECT, INC. 
CONSOLIDATED BALANCE SHEETS 
(In thousands, except per share amounts)

December 31, 2018

December 31, 2017

ASSETS

Current assets:

Cash and cash equivalents

Marketable securities

Accounts receivable, net

Prepaid expenses and other current assets

TOTAL CURRENT ASSETS

Property and equipment, net

Internal use software development costs, net

Other assets, non-current

Intangible assets, net

TOTAL ASSETS
LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:

Accounts payable and accrued expenses

Other current liabilities

TOTAL CURRENT LIABILITIES

Other liabilities, non-current

TOTAL LIABILITIES

Commitments and contingencies (Note 16)

STOCKHOLDERS' EQUITY

Preferred stock, $0.00001 par value, 10,000 shares authorized at December 31, 2018 and

2017; 0 shares issued and outstanding at December 31, 2018 and 2017

Common stock, $0.00001 par value; 500,000 shares authorized at December 31, 2018 and
2017; 51,159 and 50,239 shares issued and outstanding at December 31, 2018 and
2017, respectively
Additional paid-in capital

Accumulated other comprehensive income (loss)

Accumulated deficit

TOTAL STOCKHOLDERS' EQUITY
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY

$

80,452

$

7,524

205,683

6,882
300,541

33,487

14,570

1,240

10,174
360,012

$

239,678

$

1,304
240,982

1,017
241,999

—

1

433,877

(259)

(315,606)
118,013
360,012

$

$

$

$

76,642

52,504

165,890

9,620
304,656

47,393

12,734

5,493

13,359
383,635

214,103

3,141
217,244

1,780
219,024

—

—

418,354

41

(253,784)
164,611
383,635

The accompanying notes to consolidated financial statements are an integral part of these statements.

72

THE RUBICON PROJECT, INC. 
CONSOLIDATED STATEMENTS OF OPERATIONS 
(In thousands, except per share amounts)

Revenue
Expenses:

Cost of revenue

Sales and marketing

Technology and development

General and administrative

Restructuring and other exit costs

Impairment of intangible assets and internal use software

Impairment of goodwill

Total expenses

Loss from operations
Other (income) expense:

Interest income, net

Other income

Foreign exchange (gain) loss, net

Total other income, net

Loss before income taxes

Provision (benefit) for income taxes

Net loss

Net loss per share:

Basic and Diluted

Weighted average shares used to compute net loss per share:

Basic and Diluted

Year Ended

December 31, 2018

December 31, 2017

$

124,685

$

155,545

60,003

44,556

37,863

42,431

3,440

—

—

188,293
(63,608)

(988)
(766)
(389)
(2,143)
(61,465)
357
(61,822) $

56,836

51,794

47,500

55,596

5,959

4,585

90,251

312,521

(156,976)

(908)

(688)

1,165

(431)

(156,545)

(1,762)

(154,783)

(1.23) $

(3.17)

50,259

48,869

$

$

The accompanying notes to consolidated financial statements are an integral part of these statements.

73

THE RUBICON PROJECT, INC. 
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) 
(In thousands)

Net loss

Other comprehensive income (loss):

Unrealized gain (loss) on investments

Foreign currency translation adjustments

Other comprehensive income (loss)

Comprehensive loss

Year Ended

December 31, 2018

December 31, 2017

$

$

(61,822) $

(154,783)

27
(327)
(300)
(62,122) $

(28)

342

314

(154,469)

The accompanying notes to consolidated financial statements are an integral part of these statements.

74

THE RUBICON PROJECT, INC. 
CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY
(In thousands)

Balance at December 31, 2016

Exercise of common stock options
Restricted stock awards, net
Issuance of common stock related to employee
stock purchase plan

Issuance of common stock related to RSU
vesting
Shares withheld related to net share settlement
Stock-based compensation
Other comprehensive loss
Net loss

Balance at December 31, 2017

Exercise of common stock options
Restricted stock awards, net

Issuance of common stock related to employee
stock purchase plan

Issuance of common stock related to RSU
vesting

Shares withheld related to net share settlement
Stock-based compensation
Other comprehensive loss
Net loss

Balance at December 31, 2018

$

Shares
49,378
106
(189)

200

1,273
(529)
—
—
—
50,239
50
(156)

174

1,367

(515)
—
—
—
51,159

$

Common Stock 

Amount

Additional
Paid-In
Capital

— $
—
—

398,787
394
—

Accumulated 
Other
Comprehensive
Income (Loss)
$

(273) $
—
—

Accumulated
Deficit

Total
Stockholders’
Equity

(99,001) $
—
—

299,513
394
—

—

629

—

—
—
—
—
—
—
—
—

—

1

—
—
—
—
1

629

—
(2,403)
20,947
—
—
418,354
45
—

314

—

—

—
—
—
314
—
41
—
—

—

—

—
—
—
—
(154,783)
(253,784)
—
—

—

—

(1,638)
16,802
—
—
433,877

$

$

—
—
(300)
—
(259) $

—
—
—
(61,822)
(315,606) $

—
(2,403)
20,947
314
(154,783)
164,611
45
—

314

1

(1,638)
16,802
(300)
(61,822)
118,013

The accompanying notes to consolidated financial statements are an integral part of these statements.

75

THE RUBICON PROJECT, INC. 
CONSOLIDATED STATEMENTS OF CASH FLOWS 
(In thousands)

OPERATING ACTIVITIES:

Net loss

Adjustments to reconcile net loss to net cash provided by (used in) operating activities:

Depreciation and amortization

Stock-based compensation

Impairment of intangible assets and internal use software

Impairment of goodwill

Loss on disposal of property and equipment

Provision for doubtful accounts

Accretion of available for sale securities

Unrealized foreign currency gains, net

Deferred income taxes

Changes in operating assets and liabilities, net of effect of business acquisitions:

Accounts receivable

Prepaid expenses and other assets

Accounts payable and accrued expenses

Other liabilities

Net cash provided by (used in) operating activities

INVESTING ACTIVITIES:

Purchases of property and equipment

Capitalized internal use software development costs

Acquisitions, net of cash acquired

Investments in available-for-sale securities

Maturities of available-for-sale securities

Sales of available-for-sale securities

Net cash provided by (used in) investing activities

FINANCING ACTIVITIES:

Proceeds from exercise of stock options

Proceeds from issuance of common stock under employee stock purchase plan

Taxes paid related to net share settlement

Net cash used in financing activities

EFFECT OF EXCHANGE RATE CHANGES ON CASH, CASH EQUIVALENTS AND RESTRICTED
CASH

CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH

CASH, CASH EQUIVALENTS AND RESTRICTED CASH — Beginning of period

CASH, CASH EQUIVALENTS AND RESTRICTED CASH — End of period
SUPPLEMENTAL DISCLOSURES OF OTHER CASH FLOW INFORMATION:

Cash paid for income taxes

Cash paid for interest

Capitalized assets financed by accounts payable and accrued expenses

Capitalized stock-based compensation

Year Ended

December 31, 2018 December 31, 2017

$

(61,822) $

(154,783)

35,338

16,282

—

—

243

758

(412)

(897)

(42)

(40,688)

4,519

26,612

(2,577)

(22,686)

(11,433)

(8,507)

—

(23,991)

62,650

9,228

27,947

45

314

(1,638)

(1,279)

(172)

3,810

76,642

$

$

$

$

$

80,452

$

379

46

6

520

$

$

$

$

36,225

20,504

4,585

90,251

195

580

(276)

970

(1,564)

26,051

(224)

(502)

(477)

21,535

(32,438)

(7,988)

(38,610)

(95,224)

81,050

—

(93,210)

394

629

(2,403)

(1,380)

199

(72,856)

149,498

76,642

382

61

109

443

The accompanying notes to consolidated financial statements are an integral part of these statements.

76

THE RUBICON PROJECT, INC. 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 1—Nature of Operations

Company Overview

  The Rubicon Project, Inc., or Rubicon Project (the "Company"), was formed on April 20, 2007 in Delaware and began 

operations in April 2007. The Company is headquartered in Los Angeles, California.

The Company provides a technology solution to automate the purchase and sale of digital advertising inventory for buyers 

and sellers. The Company's platform features applications and services for digital advertising sellers, including websites, mobile 
applications and other digital media properties, and their representatives, to sell their digital advertising inventory; applications and 
services for buyers, including advertisers, agencies, agency trading desks, and demand side platforms, or DSPs, to buy digital 
advertising inventory; and a marketplace over which such transactions are executed. Together, these features power and enhance a 
comprehensive, transparent, independent advertising marketplace that brings buyers and sellers together and facilitates intelligent 
decision making and automated transaction execution for the digital advertising inventory managed on the Company's platform. The 
Company's clients include many of the world's leading publishers of websites and mobile applications and buyers of digital 
advertising inventory.

Advertising inventory takes different forms, referred to as advertising units, is purchased and sold through different 

transactional methodologies, and allows advertising content to be presented to consumers through different channels. The 
Company's solution enables buyers and sellers to purchase and sell:

•

•

•

a comprehensive range of advertising units, including display, audio and video;

that are transacted through real-time bidding ("RTB"), which includes (i) direct sale of premium inventory, which the
Company refers to as private marketplace ("PMP"), and (ii) open auction bidding, which the Company refers to as open
marketplace ("OMP"); and

that are displayed across digital channels, including mobile web, mobile application, and desktop, as well as across various
out-of-home channels, such as digital billboards.

Risks and Uncertainties

The Company has been negatively impacted by rapid changes in the ad tech industry, including demand by ad tech buyers
for more efficiency and lower costs, changes in bidding technologies, and increased competition. In response to these challenges, 
the Company made significant reductions in fees charged to buyers during 2017 and in November 2017 eliminated its buyer fees 
altogether. The competitive pressures and reduced take rate resulted in lower revenue on an annual basis in 2018 compared to the 
prior year. In an effort to bring its costs into better alignment with reduced take rates, the Company has undertaken restructuring 
activities to reduce headcount and related operating costs, and has also reduced its capital expenditures. Unless and until the 
Company is able to compensate for the fee reductions and reduced margins by continuing to increase advertising spending on its 
platform, or sufficiently reducing costs, it may not be able to grow its business and may continue to operate at a loss, depleting its 
cash resources and liquidity. If the Company continues to experience significant operating losses in the future, the Company may 
require additional liquidity to fund its operations. 

Note 2—Organization and Summary of Significant Accounting Policies

Basis of Consolidation

The accompanying consolidated financial statements have been prepared in accordance with accounting principles 

generally accepted in the United States of America, or GAAP, and include the operations of the Company and its wholly owned 
subsidiaries. All significant inter-company transactions and balances have been eliminated in consolidation.

Segments

Management has determined that the Company operates as one segment. The Company’s chief operating decision maker 
reviews financial information on an aggregated and consolidated basis, together with certain operating and performance measures 
principally to make decisions about how to allocate resources and to measure the Company’s performance.

Use of Estimates

The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates 

and assumptions that affect the reported and disclosed financial statements and accompanying footnotes. Actual results could differ 

77

materially from these estimates.

On an ongoing basis, management evaluates its estimates, primarily those related to: (i) revenue recognition criteria, 

including the determination of revenue reporting as net versus gross in the Company’s revenue arrangements, (ii) accounts 
receivable and allowances for doubtful accounts, (iii) the useful lives of intangible assets and property and equipment, (iv) valuation 
of long-lived assets and their recoverability, including goodwill, (v) the realization of tax assets and estimates of tax liabilities, 
(vi) assumptions used in valuation models to determine the fair value of stock-based awards, (vii) fair value of financial instruments,
(viii) the recognition and disclosure of contingent liabilities, and (ix) the assumptions used in valuing acquired assets and assumed
liabilities in business combinations. These estimates are based on historical data and experience, as well as various other factors that
management believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the
carrying value of assets and liabilities that are not readily apparent from other sources. Estimates relating to the valuation of stock
and business combinations, as well as the recoverability of long-lived assets and goodwill, require the selection of appropriate
valuation methodologies and models, and significant judgment in evaluating ranges of assumptions and financial inputs. Actual
results may differ materially from those estimates under different assumptions or circumstances.

Revenue Recognition

The Company generates revenue from transactions where it provides a platform for the purchase and sale of digital 
advertising inventory between buyers and sellers of advertising inventory. Digital advertising inventory is created when consumers 
access sellers’ content. Sellers provide digital advertising inventory to our platform in the form of advertising requests, or ad 
requests. When the Company receives ad requests from sellers, it sends bid requests to buyers, which enable buyers to bid on 
sellers’ digital advertising inventory. Winning bids can create advertising, or paid impressions, for the seller to present to the 
consumer. 

The total volume of spending between buyers and sellers on the Company's platform is referred to as advertising spend. 

The Company keeps a percentage of that advertising spend as a fee, and remits the remainder to the seller. The fee that the Company 
retains from the gross advertising spend on its platform is recognized as revenue. The fee earned on each transaction is based on the 
pre-existing agreement with the seller and the clearing price of the winning bid. The Company recognizes revenue upon fulfillment 
of its performance obligation to a client, which occurs at the point in time an ad renders and is counted as a paid impression, subject 
to a contract existing with the client and a fixed or determinable transaction price. Performance obligations for all transactions are 
satisfied, and the corresponding revenue is recognized, at a distinct point in time; the Company has no arrangements with multiple 
performance obligations. The Company considers the following when determining if a contract exists (i) contract approval by all 
parties, (ii) identification of each party’s rights regarding the goods or services to be transferred, (iii) specified payment terms, 
(iv) commercial substance of the contract, and (v) collectability of substantially all of the consideration is probable.

The Company evaluates whether it acts as the principal in the purchase and sale of digital advertising inventory to 

determine whether revenue should be reported on a gross or net basis. The Company has determined that it does not act as the 
principal in the purchase and sale of digital advertising inventory because it does not have control of the digital advertising 
inventory and does not set prices agreed upon within the auction marketplace, and therefore reports revenue on a net basis. In 
periods prior to the second quarter of 2017, the Company reported revenue on a gross basis for revenue associated with its intent 
marketing solution, as the Company determined that it acted as the principal in the purchase and sale of digital advertising 
inventory. The Company ceased offering its intent marketing solution after the first quarter of 2017, after which time, all of the 
Company’s revenues have been recorded on a net basis. See Note 4 for additional disclosure of our revenue policies and 
disaggregated presentation of our revenues.

Expenses

The Company classifies its expenses into the following seven categories:

Cost of Revenue. The Company's cost of revenue consists of data center costs, bandwidth costs, depreciation and 

maintenance expense of hardware supporting the Company's revenue-producing platform, amortization of software costs for the 
development of the Company's revenue-producing platform, amortization expense associated with acquired developed technologies, 
personnel costs, and facilities-related costs. For intent marketing transactions conducted in the first quarter of 2017 in which the 
Company was the principal and reported revenues on a gross basis, cost of revenue also included amounts the Company paid to 
sellers for their inventory. Personnel costs included in cost of revenue include salaries, bonuses, stock-based compensation, and 
employee benefit costs, and are primarily attributable to personnel in the Company's network operations group who support the 
Company's platform. The Company capitalizes costs associated with software that is developed or obtained for internal use and 
amortizes the costs associated with its revenue-producing platform in cost of revenue over their estimated useful lives. The 
Company amortizes acquired developed technologies over their estimated useful lives.

Sales and Marketing. The Company's sales and marketing expenses consist primarily of personnel costs, including stock-

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based compensation and sales bonuses paid to the Company's sales organization, marketing expenses such as brand marketing, 
travel expenses, trade shows and marketing materials, professional services, and amortization expense associated with client 
relationships and backlog from the Company's business acquisitions and, to a lesser extent, facilities-related costs and depreciation 
and amortization. The Company's sales organization focuses on increasing the adoption of the Company's solution by existing and 
new buyers and sellers. The Company amortizes acquired intangibles associated with client relationships and backlog from its 
business acquisitions over their estimated useful lives.

Technology and Development. The Company's technology and development expenses consist primarily of personnel costs, 

including stock-based compensation and bonuses, and professional services associated with the ongoing development and 
maintenance of the Company's solution and, to a lesser extent, facilities-related costs and depreciation and amortization, including 
amortization expense associated with acquired intangible assets from the Company's business acquisitions that are related to 
technology and development functions. These expenses include costs incurred in the development, implementation and maintenance 
of internal use software, including platform and related infrastructure. Technology and development costs are expensed as incurred, 
except to the extent that such costs are associated with internal use software development that qualifies for capitalization, which are 
then recorded as internal use software development costs, net on the Company's consolidated balance sheet. The Company 
amortizes internal use software development costs that relate to its revenue-producing activities on the Company's platform to cost 
of revenue and amortizes other internal use software development costs to technology and development costs or general and 
administrative expenses, depending on the nature of the related project. The Company amortizes acquired intangibles associated 
with technology and development functions from its business acquisitions over their estimated useful lives.

General and Administrative. The Company's general and administrative expenses consist primarily of personnel costs, 

including stock-based compensation and bonuses, associated with the Company's executive, finance, legal, human resources, 
compliance, and other administrative personnel, as well as accounting and legal professional services fees, facilities-related costs 
and depreciation, and other corporate-related expenses. General and administrative expenses also include amortization of internal 
use software development costs and acquired intangible assets from the Company's business acquisitions over their estimated useful 
lives that relate to general and administrative functions and changes in fair value associated with the liability-classified contingent 
consideration related to acquisitions.

Restructuring and Other Exit Costs. The Company's restructuring and other exit costs are cash and non-cash charges 

consisting primarily of employee termination costs, facility closure and relocation costs, and contract termination costs.

Impairment of Intangible Assets and Internal Use Software. The Company's impairment charges are non-cash charges 

related to its intangible assets. Intangible assets are reviewed for impairment indicators at least annually and whenever events or 
changes in circumstances indicate that the carrying amount of the assets might not be recoverable. Refer to the "Intangible Assets" 
policy within this footnote for additional information regarding the determination of impairment charges related to intangible assets.

Impairment of Goodwill. The Company's goodwill impairment charges are non-cash charges related to its goodwill asset. 

Goodwill is tested annually for impairment during the fourth quarter or more frequently if events or changes in circumstances 
indicate that goodwill may be impaired. Refer to the "Goodwill" policy within this footnote for additional information regarding the 
determination of goodwill impairment charges.

Stock-Based Compensation

Compensation expense related to stock-based awards is measured and recognized in the consolidated financial statements 

based on the fair value of the awards granted. The Company has granted restricted stock awards, restricted stock units, and stock 
option awards that vest based solely on continued service, or service conditions, to employees and non-employees. The fair value of 
each share-based award containing service conditions is based on the Company's grant date common share price for restricted stock 
awards and restricted stock units and is estimated using the Black-Scholes option-pricing model for stock option awards. For service 
condition awards, stock-based compensation expense is recognized on a straight-line basis over the requisite service periods of the 
awards, or the vesting period, which is generally four years. 

As of July 1, 2018, the Company prospectively adopted ASU 2018-07—Stock Compensation (Topic 718) ("ASU 
2018-07"), which updated the treatment of non-employee share-based awards to conform with the existing guidance under 
Accounting Standards Codification Topic 718, Compensation—Stock Compensation that was already applicable to share-based 
awards granted to employees. Prior to this adoption, the Company remeasured the fair value of each non-employee stock-based 
award each period until a commitment date was reached, which was generally the vesting date. As of the adoption date, the fair 
value of existing unvested awards held by non-employees was determined based on the adoption date fair value, which will be 
recognized over the remaining service period. For employees that transition into a non-employee contractor relationship with the 
Company subsequent to the adoption date their existing awards will continue to be recognized at the original grant date fair value. 
There was no impact to the Company's consolidated financial statements resulting from the adoption of ASU 2018-07.

79

The assumptions and estimates used in the Black-Scholes pricing model are as follows:

Fair Value of Common Stock. The fair value of common stock is based on the closing price of the Company's common 

stock as reported on the New York Stock Exchange, or the NYSE, on the date of grant. 

Risk-Free Interest Rate. The Company bases the risk-free interest rate used in the Black-Scholes option-pricing model on 

the yields of U.S. Treasury securities with maturities appropriate for the term of stock option awards.

Expected Term. For employee options that contain service conditions, the Company applies the simplified approach, in 

which the expected term of an award is presumed to be the mid-point between the vesting date and the expiration date of the award. 
The expected term of employee stock options that contain performance conditions represents the weighted-average period that the 
stock options are estimated to remain outstanding.

Volatility. Because the Company does not have significant trading history for the Company’s common stock, the Company 

determines the price volatility based on the historical volatilities of a publicly traded peer group based on daily price observations 
over a period equivalent to the expected term of the stock option grants.

Dividend Yield. The dividend yield assumption is based on the Company’s history and current expectations of dividend 

payouts. The Company has never declared or paid any cash dividends on its common stock and does not anticipate paying any cash 
dividends in the foreseeable future, so the Company used an expected dividend yield of zero.

Determining the fair value of stock-based awards using a pricing model requires judgment. The Company’s use of the 

Black-Scholes option-pricing model requires the input of subjective assumptions such as the expected term of the award, the 
expected volatility of the price of the Company’s common stock, risk-free interest rates, and the expected dividend yield of the 
Company’s common stock. The assumptions used in the Company’s valuation model represent management’s best estimates. These 
estimates involve inherent uncertainties and the application of management’s judgment. If factors change and different assumptions 
are used, the Company’s stock-based compensation expense could be materially different in the future. 

Due to the full valuation allowance provided on its net deferred tax assets, the Company has not recorded any tax benefit 

attributable to stock-based awards for the years ended December 31, 2018 and 2017.

Income Taxes

Deferred income tax assets and liabilities are determined based upon the net tax effects of the differences between the 

Company’s consolidated financial statement carrying amounts and the tax basis of assets and liabilities and are measured using the 
enacted tax rate expected to apply to taxable income in the years in which the differences are expected to be reversed.

A valuation allowance is used to reduce some or all of the deferred tax assets if, based upon the weight of available 
evidence, it is more likely than not that those deferred tax assets will not be realized. The Company has established a full valuation 
allowance to offset its domestic net deferred tax assets due to the uncertainty of realizing future tax benefits from the net operating 
loss carryforwards and other deferred tax assets.

The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax 

position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits 
recognized in the consolidated financial statements from such positions are then measured based on the largest benefit that has a 
greater than 50% likelihood of being realized. The Company recognizes interest and penalties accrued related to its uncertain tax 
positions in its income tax provision (benefit) in the consolidated statements of operations.

The Tax Cuts and Jobs Act (“the Tax Act”) was enacted in December 2017. The Tax Act significantly changes U.S. tax law 

by, among other things, lowering U.S. corporate income tax rates, implementing a territorial tax system and imposing a one-time 
transition tax on deemed repatriated earnings of foreign subsidiaries. The Tax Act reduces the U.S. corporate income tax rate from 
34% to 21%, effective January 1, 2018. The Company recognized the impact of the revaluation of deferred tax balances and the 
provisional impact related to the one-time transition tax in its consolidated financial statements for the year ended December 31, 
2017. The Company completed its analysis of the impact of U.S. tax reform during 2018 in accordance with the SAB 118 
measurement period and there were no changes to the amounts recorded.

80

Capital Stock 

The Company has authorized capital stock of 500,000,000 shares of common stock and 10,000,000 shares of preferred 
stock. The Company has issued common stock, which is included in outstanding common stock on the Company's Consolidated 
Balance Sheets. The Company has not issued any shares of its preferred stock subsequent to the Company's IPO and does not have 
any preferred stock outstanding.

The Company is required to reserve and keep available out of its authorized but unissued shares of common stock such 

number of shares sufficient to effect any of the Company's contingent consideration liabilities and the conversion of all shares 
granted and available for grant under the Company’s stock award plans. The number of shares of the Company's stock reserved for 
these purposes at December 31, 2018 was 18,094,154.

The board of directors is authorized to establish, from time to time, the number of shares to be included in each series of 

preferred stock, and to fix the designation, powers, privileges, preferences, and relative participating, optional or other rights, if any, 
of the shares of each series of preferred stock, and any of its qualifications, limitations or restrictions.

Net Income (Loss) Per Share Attributable to Common Stockholders

Basic net income (loss) per share of common stock is calculated by dividing the net income (loss) by the weighted-average 

number of shares of common stock outstanding. Diluted income (loss) per share attributable to common stockholders adjusts the 
basic weighted-average number of shares of common stock outstanding for the effect of potentially dilutive securities during the 
period. Potentially dilutive securities consist of stock options, restricted stock awards, restricted stock units, potential shares issued 
under the Company's Employee Stock Purchase Plan ("ESPP"), shares held in escrow and potential shares issuable as part of 
contingent consideration as a result of business combinations. For purposes of this calculation, potentially dilutive securities are 
excluded from the calculation of diluted net income (loss) per share if their effect is anti-dilutive.

Comprehensive Income (Loss)

Comprehensive income (loss) encompasses all changes in equity other than those arising from transactions with 
stockholders, and consists of net income (loss), unrealized gains (losses) on investments and foreign currency translation 
adjustments.

Cash, Cash Equivalents, and Marketable Securities

The Company invests excess cash primarily in money market funds, corporate debt securities, and highly liquid debt 
instruments of the U.S. government and its agencies. The Company classifies investments held in money market funds as cash 
equivalents because the money market funds have weighted-average maturities at the date of purchase of less than 90 days. 
Investments held in U.S. government and agency bonds and corporate debt securities with stated maturities of less than one year are 
classified as short-term investments included in marketable securities and prepaid expenses and other current assets. Investments 
held in U.S. government and agency bonds and corporate debt securities with stated maturities of over a year are classified as long-
term investments included in other assets, non-current on the Company’s consolidated balance sheets, as the Company does not 
expect to redeem or sell these securities within one year from the balance sheet date. 

The Company determines the appropriate classification of investments in marketable securities at the time of purchase and 

reevaluates such designation at each balance sheet date. The Company classifies and accounts for the Company’s marketable 
securities as available-for-sale, and as a result carries the securities at fair value and reports the unrealized gains and losses in the 
consolidated statements of comprehensive income (loss) and as a component of stockholders’ equity. The Company determines any 
realized gains or losses on the sale of marketable securities on a specific identification method, and the Company records such gains 
and losses as a component of other income, net on the Company’s consolidated statements of operations.

Restricted Cash

The Company classifies certain restricted cash balances within prepaid expenses and other current assets on the 

consolidated balance sheets based upon the term of the remaining restrictions. At December 31, 2018 and 2017 the Company had no 
restricted cash.

Accounts Receivable Allowance for Doubtful Accounts

Accounts receivable are recorded at the invoiced amount, are unsecured, and do not bear interest. The allowance for 

doubtful accounts is based on the best estimate of the amount of probable credit losses in existing accounts receivable. The 
allowance for doubtful accounts is determined based on historical collection experience and the review in each period of the status 

81

of the then-outstanding accounts receivable, while taking into consideration current client information, subsequent collection history 
and other relevant data. The Company reviews the allowance for doubtful accounts on a quarterly basis. Account balances are 
charged off against the allowance when the Company believes it is probable the receivable will not be recovered. The Company’s 
allowance for doubtful accounts was approximately $1.3 million and $0.5 million at December 31, 2018 and 2017, respectively. 
During the years ended December 31, 2018 and 2017, the Company wrote-off $0.6 million and $0.7 million, respectively, of 
accounts receivable.

Property and Equipment, Net

Property and equipment are recorded at historical cost, less accumulated depreciation and amortization. Depreciation is 

computed using the straight-line method based upon the estimated useful lives of the assets. The estimated useful lives of the 
Company’s property and equipment are as follows:

Computer equipment and network hardware
Furniture, fixtures and office equipment
Leasehold improvements

Computer equipment under capital leases

Years
3
5 to 7
Shorter of useful life or life of lease

Shorter of useful life or life of lease

Repair and maintenance costs are charged to expense as incurred, while renewals and improvements are capitalized. When 

assets are retired or otherwise disposed of, the cost and related accumulated depreciation are removed from the accounts and any 
resulting gain or loss is reflected in the Company’s results of operations.

Internal Use Software Development Costs

The Company capitalizes certain internal use software development costs associated with creating and enhancing internally 
developed software related to the Company’s technology infrastructure. These costs include personnel and related employee benefits 
expenses for employees who are directly associated with and who devote time to software projects, and external direct costs of 
materials and services consumed in developing or obtaining the software. Software development costs that do not meet the 
qualification for capitalization, as further discussed below, are expensed as incurred and recorded in technology and development 
expenses in the results of operations.

Software development activities generally consist of three stages, (i) the planning stage, (ii) the application and 
infrastructure development stage, and (iii) the post implementation stage. Costs incurred in the planning and post implementation 
stages of software development, including costs associated with the post-configuration training and repairs and maintenance of the 
developed technologies, are expensed as incurred. The Company capitalizes costs associated with software developed for internal 
use when the planning stage is completed, management has authorized further funding for the completion of the project, and it is 
probable that the project will be completed and perform as intended. Costs incurred in the application and infrastructure 
development stages, including significant enhancements and upgrades, are capitalized. Capitalization ends once a project is 
substantially complete and the software and technologies are ready for their intended purpose. Internal use software development 
costs are amortized using a straight-line method over the estimated useful life of three years, commencing when the software is 
ready for its intended use. The straight-line recognition method approximates the manner in which the expected benefit will be 
derived.

The Company does not transfer ownership of its software, or lease its software, to third parties.

Intangible Assets

Intangible assets primarily consist of acquired developed technology, client relationships, and non-compete agreements 

resulting from business combinations, which are recorded at acquisition-date fair value, less accumulated amortization. The 
Company determines the appropriate useful life of its intangible assets by performing an analysis of expected cash flows of the 
acquired assets. Intangible assets are amortized over their estimated useful lives using a straight-line method, which approximates 
the pattern in which the economic benefits are consumed.

82

The Company’s intangible assets are being amortized over their estimated useful lives as follows:

Developed technology
Client relationships
Non-compete agreements
Other intangible assets

Years
3 to 5
2.5 to 3
2 to 3
1 to 1.5

Intangible assets are reviewed for impairment indicators at least annually and whenever events or changes in circumstances 

indicate that the carrying amount of the assets might not be recoverable. Conditions that would necessitate an impairment 
assessment include a significant decline in the observable market value of an asset, a significant change in the extent or manner in 
which an asset is used, or any other significant adverse change that would indicate that the carrying amount of an asset or group of 
assets may not be recoverable. For intangible assets used in operations, impairment losses are only recorded if the asset’s carrying 
amount is not recoverable through its undiscounted, probability-weighted future cash flows. The Company measures the impairment 
loss based on the difference between the carrying amount and estimated fair value. 

Impairment of Long-Lived Assets including Internal Use Capitalized Software Costs

The Company assesses the recoverability of its long-lived assets when events or changes in circumstances indicate their 
carrying value may not be recoverable. Such events or changes in circumstances may include: a significant adverse change in the 
extent or manner in which a long-lived asset is being used, significant adverse change in legal factors or in the business climate that 
could affect the value of a long-lived asset, an accumulation of costs significantly in excess of the amount originally expected for 
the acquisition or development of a long-lived asset, current or future operating or cash flow losses that demonstrate continuing 
losses associated with the use of a long-lived asset, or a current expectation that, more likely than not, a long-lived asset will be sold 
or otherwise disposed of significantly before the end of its previously estimated useful life. The Company performs impairment 
testing at the asset group level that represents the lowest level for which identifiable cash flows are largely independent of the cash 
flows of other assets and liabilities. The Company assesses recoverability of a long-lived asset by determining whether the carrying 
value of the asset group can be recovered through projected undiscounted cash flows over their remaining lives. If the carrying 
value of the asset group exceeds the forecasted undiscounted cash flows, an impairment loss is recognized, measured as the amount 
by which the carrying amount exceeds estimated fair value. An impairment loss is charged to operations in the period in which 
management determines such impairment.

Business Combinations

The results of businesses acquired in a business combination are included in the Company’s consolidated financial 

statements from the date of acquisition. The Company allocates the purchase price of a business combination, which is the sum of 
the consideration provided, which may consist of cash, equity or a combination of the two, to the identifiable assets and liabilities of 
the acquired business at their acquisition date fair values. The excess of the purchase price over the amount allocated to the 
identifiable assets and liabilities, if any, is recorded as goodwill. Determining the fair value of assets acquired and liabilities 
assumed requires management to use significant judgment and estimates including the selection of valuation methodologies, 
estimates of future revenues and cash flows, discount rates and selection of comparable companies.

When the Company issues stock-based or cash awards to an acquired company’s stockholders, the Company evaluates 

whether the awards are contingent consideration or compensation for post-business combination services. The evaluation includes, 
among other things, whether the vesting of the awards is contingent on the continued employment of the selling stockholder beyond 
the acquisition date. If continued employment is required for vesting, the awards are treated as compensation for post-acquisition 
services and recognized as expense over the requisite service period.

The Company estimates the fair value of intangible assets acquired generally using a discounted cash flow approach, which 
includes an analysis of the future cash flows expected to be generated by the asset and the risk associated with achieving these cash 
flows. The key assumptions used in the discounted cash flow model include the discount rate that is applied to the forecasted future 
cash flows to calculate the present value of those cash flows and the estimate of future cash flows attributable to the acquired 
intangible asset, which include revenue, expenses and taxes. The carrying value of acquired working capital assets and liabilities 
approximates its fair value, given the short-term nature of these assets and liabilities.

Acquisition-related transaction costs are not included as a component of consideration transferred, but are accounted for as 

an expense in the period in which the costs are incurred.

83

Goodwill

Goodwill represents the excess of the aggregate fair value of the consideration transferred in a business combination over 

the fair value of the assets acquired, net of liabilities assumed. Goodwill is not amortized, but is subject to impairment testing 
conducted annually during the fourth quarter or more frequently if events or changes in circumstances indicate that goodwill may be 
impaired. 

The Company adopted Accounting Standards Update ("ASU") 2017-04—Goodwill and Other (Topic 350): Simplifying the 
Test for Goodwill Impairment during the first quarter of 2017. In accordance with the guidance, the Company has the option to first 
assess qualitative factors to determine whether or not it is necessary to perform the quantitative goodwill impairment test. If the 
qualitative assessment option is not elected, or if the qualitative assessment indicates that it is more likely than not that the fair value 
is less than its carrying amount, a quantitative analysis is then performed. The quantitative analysis, if performed, compares the 
estimated fair value of the Company with its respective carrying amount, including goodwill. If the estimated fair value of the 
Company exceeds its carrying amount, including goodwill, goodwill is considered not to be impaired and no additional steps are 
necessary. If the fair value is less than the carrying amount, including goodwill, then an impairment adjustment must be recorded up 
to the carrying amount of goodwill.

The Company operates as a single operating segment and has identified a single reporting unit. In the third quarter of 2017, 

the Company identified potential indications of impairment and performed a quantitative goodwill impairment assessment and 
determined that the fair value of the Company was less than the carrying value, including goodwill. As a result, the Company 
recorded a goodwill impairment charge of $90.3 million during the third quarter of 2017. Refer to Note 5 for a description of the 
methods used to compute the goodwill impairment charge in the third quarter of 2017. 

Operating and Capital Leases

The Company records rent expense for operating leases, some of which have escalating rent payments, on a straight-line 

basis over the lease term. The Company begins recognition of rent expense on the date of initial possession, which is generally 
when the Company enters the leased premises and begins to make improvements in preparation for its intended use. Some of the 
Company’s lease arrangements provide for concessions by the landlords, including payments for leasehold improvements and rent-
free periods. The Company accounts for the difference between the straight-line rent expense and rent paid as a deferred rent 
liability.

Assets and liabilities under capital lease are recorded at the lesser of present value of aggregate future minimum lease 
payments, including estimated bargain purchase options, or the fair value of the asset under lease. Assets under capital lease are 
amortized using the straight-line method over the estimated useful lives of the assets. The Company has no capital leases at 
December 31, 2018.

Fair Value of Financial Instruments

The carrying amounts of the Company's cash equivalents, accounts receivable, accounts payable, accrued expenses, and 

seller payables approximate fair value due to the short-term nature of these instruments. Certain assets of the Company are recorded 
at their fair value, using the fair value hierarchy, on a recurring basis, and other assets and liabilities, including goodwill and 
intangible assets are subject to measurement at fair value on a non-recurring basis if they are deemed to be impaired as a result of an 
impairment review (see Note 5). 

Concentration of Risk

Financial instruments that potentially subject the Company to concentration of credit risk consist principally of cash, cash 

equivalents, restricted cash and accounts receivable. Cash and cash equivalents maintained with financial institutions exceed 
applicable federally insured limits.

Accounts receivable include amounts due from buyers with principal operations primarily in the United States. The 

Company performs ongoing credit evaluations of its buyers.

At December 31, 2018, two buyers accounted for 21% and 13%, respectively, of consolidated accounts receivable. At 

December 31, 2017, two buyers accounted for 20% and 15%, respectively, of accounts receivable.

The Company recognizes revenue from its contracts with sellers, and no seller of advertising inventory comprised 10% or 

more of revenue in 2018 or 2017. 

At December 31, 2018 and 2017, no seller of advertising inventory comprised 10% or more of accounts payable. 

84

Foreign Currency Transactions and Translation

Transactions in foreign currencies are translated into the functional currency of the applicable entity at the rates of 
exchange in effect at the date of the transaction. Foreign exchange gains or losses were included in foreign exchange (gain) loss, net 
in the accompanying consolidated statements of operations. To the extent that the functional currency is different than the U.S 
Dollar, the financial statements have then been translated into U.S. Dollars using period-end exchange rates for assets and liabilities 
and average exchanges rates for the results of operations. Foreign currency translation gains and losses are included as a component 
of accumulated other comprehensive income (loss) on the consolidated balance sheet.

Recently Adopted Accounting Pronouncements

On January 1, 2018, the Company adopted the following accounting pronouncements, using a prospective adoption 

method, which did not have an impact on the Company's consolidated financial statements and did not result in any significant 
policy changes:

•

•

Accounting Standards Update ("ASU") 2017-01—Business Combinations (Topic 805): Clarifying the Definition of a
Business; and
ASU 2017-09—Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting.
The Company has also adopted ASU 2016-15—Statement of Cash Flows (Topic 230): Classification of Certain Cash

Receipts and Cash Payments, although the retrospective adoption method did not have an impact on periods presented. The 
Company will apply this guidance to applicable future transactions.

Recent Accounting Pronouncements 

Under the Jumpstart Our Business Startups Act, or the JOBS Act, the Company meets the definition of an emerging growth 

company. The Company has irrevocably elected to opt out of the extended transition period for complying with new or revised 
accounting standards pursuant to Section 107(b) of the JOBS Act.

In February 2016, the Financial Accounting Standards Board ("FASB") issued ASU 2016-02—Leases (Topic 842) ("ASU 

2016-02"), which requires an entity to recognize right-of-use assets and lease liabilities on its balance sheet and disclose key 
information about leasing arrangements. ASU 2016-02 offers specific accounting guidance for a lessee, a lessor, and sale and 
leaseback transactions. Lessees and lessors are required to disclose qualitative and quantitative information about leasing 
arrangements to enable a user of the financial statements to assess the amount, timing and uncertainty of cash flows arising from 
leases. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the 
income statement. ASU 2016-02 is effective for annual reporting periods beginning after December 15, 2018, including interim 
periods within that reporting period, with early adoption permitted. ASU 2016-02 required a modified retrospective adoption 
approach, however subsequent guidance (discussed below) provides an additional option for adoption approach. 

In July 2018, the FASB issued ASU 2018-11—Leases (Topic 842): Targeted Improvements ("ASU 2018-11"), which 

updates some of the implementation requirements under Accounting Standards Codification Topic 842 on leases. ASU 2018-11 
provides for an additional adoption approach that was not previously included in ASU 2016-02 that allows for a prospective 
application. This guidance eliminates the requirement to present prior year comparative lease disclosures once ASU 2016-02 is 
adopted, and must be adopted concurrently with ASU 2016-02. The Company plans to apply the adoption method made available by 
ASU 2018-11.

Although the Company is evaluating the impact of adopting ASU 2016-02 on its consolidated financial statements, the 

Company expects that most of its operating lease commitments will be recognized as operating lease liabilities and right-of-use 
assets upon adoption of the new guidance. The adoption date of this guidance is January 1, 2019 in accordance with ASU 2018-11 
and prior periods will not be adjusted. The Company continues to implement changes to its systems, processes and controls, in 
conjunction with its review of existing lease agreements. The Company’s leases primarily include, real estate leases (office space), 
equipment leases, and data center leases. The adoption of the new accounting guidance will have a material, although largely 
offsetting, impact on its consolidated balance sheet in future periods, with increases to both its total assets and total liabilities by 
establishing right-of-use assets and lease liabilities, respectively. The adoption of this guidance will not have a material impact to the 
Company's consolidated statements of operations and the Company does not expect it to have any impact on its total cash flows 
from operating, investing or financing activities.

In August 2018, the FASB issued ASU 2018-13—Fair Value Measurement (Topic 820): Disclosure Framework—Changes 

to the Disclosure Requirements for Fair Value Measurement ("ASU 2018-13"), to streamline the disclosure requirements of ASC 
Topic 820—Fair Value Measurement. ASU 2018 removes certain disclosure requirements, including the valuation process for Level 
3 fair value measurements, and adds certain quantitative disclosures around Level 3 fair value measurements. This ASU is effective 
for annual reporting periods beginning after December 15, 2019, including interim periods within that reporting period, with early 
adoption permitted. The provisions of ASU 2018-13 are required to be adopted retrospectively, with the exception of disclosure of 

85

the range and weighted average of significant unobservable inputs used to develop Level 3 measurements, which can be adopted 
prospectively. The Company is currently evaluating the effect this guidance will have on its consolidated financial statements and 
related disclosures.

In August 2018, the FASB issued ASU 2018-15—Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 

350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract
("ASU 2018-15"). ASU 2018-15 was issued to clarify the requirements of ASC 350-40—Intangibles—Goodwill and Other—
Internal-Use Software ("ASC 350-40"). The ASU clarifies that implementation, setup and other upfront costs related to cloud
hosting agreements should be accounted for under ASC 350-40. This ASU is effective for annual reporting periods beginning
after December 15, 2019, including interim periods within that reporting period, with early adoption permitted. ASU 2018-15 can be
applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The Company is
currently evaluating the effect this guidance will have on its consolidated financial statements.

In December 2018, the FASB issued ASU 2018-20—Leases (Topic 842): Narrow-Scope Improvements for Lessors ("ASU 

2018-20"). ASU 2018-20 was issued to clarify the requirements for lessors under ASC 842—Leases ("ASC 842"). The ASU 
clarifies the recognition timing and requirements of certain payments made by lessees to either the lessor or a third party. This ASU 
is effective for annual reporting periods beginning after December 15, 2018, including interim periods within that reporting period, 
with its adoption aligned with the adoption of ASU 2016-02. The Company functions as the sublessor for a limited number of real 
estate leases, however ASU 2018-20 is not applicable to these subleases. 

Note 3—Net Income (Loss) Per Share

The following table presents the basic and diluted net loss per share:  

Basic and Diluted EPS:

Net loss

Weighted-average common shares outstanding

Weighted-average unvested restricted shares

Weighted-average common shares outstanding used to compute net loss per share

Basic and diluted net loss per share

Year Ended

December 31, 2018

December 31, 2017

(in thousands, except per share data)

$

$

(61,822) $
50,602
(343)
50,259

(1.23) $

(154,783)

49,720

(851)

48,869

(3.17)

The following weighted-average shares have been excluded from the calculation of diluted net loss per share attributable 

to common stockholders for each period presented because they are anti-dilutive: 

Options to purchase common stock

Unvested restricted stock awards

Unvested restricted stock units

ESPP

Total shares excluded from net loss per share

Note 4—Revenues

Year Ended

December 31, 2018

December 31, 2017

(in thousands)

128

218

2,029

55

2,430

120

297

556

50

1,023

On January 1, 2018, the Company adopted Accounting Standards Update 2014-09—Revenue from Contracts with 
Customers (Topic 606) ("ASU 2014-09") using a modified retrospective approach applied to all contracts that generated revenue in 
the preceding year. The adoption of this guidance did not have an impact on the amount or timing of revenue recognized by the 
Company. 

The Company generates revenue from transactions where it provides a platform for the purchase and sale of digital advertising 
inventory. The Company’s advertising automation solution is a marketplace for sellers of digital advertising inventory (providers of 
websites, mobile applications and other digital media properties, and their representatives) and buyers of digital advertising inventory 
(including advertisers, agencies, agency trading desks, and demand-side platforms). This solution incorporates proprietary machine-

86

learning algorithms, sophisticated data processing, high-volume storage, detailed analytics capabilities, and a distributed infrastructure. 
Together, these features form the basis for the Company’s automated advertising solution that brings buyers and sellers together and 
facilitates  intelligent  decision-making  and  automated  transaction  execution  for  the  digital  advertising  inventory  managed  on  the 
Company's platform. Digital advertising inventory is created when consumers access sellers’ content. Sellers provide digital advertising 
inventory to the Company’s platform in the form of advertising requests, or ad requests. When the Company receives ad requests from 
sellers, it sends bid requests to buyers, which enable buyers to bid on sellers’ digital advertising inventory. Winning bids can create 
advertising, or paid impressions, for the seller to present to the consumer. 

The total volume of spending between buyers and sellers on the Company’s platform is referred to as advertising spend. 

The Company keeps a percentage of that advertising spend as a fee, and remits the remainder to the seller. The fee that the Company 
retains from the gross advertising spend on its platform is recognized as revenue. The fee earned on each transaction is based on the 
pre-existing agreement between the Company and the seller and the clearing price of the winning bid. The Company recognizes 
revenue upon fulfillment of its performance obligation to a client, which occurs at the point in time an ad renders and is counted as a 
paid impression, subject to an underlying agreement existing with the client and a fixed or determinable transaction price. 
Performance obligations for all transactions are satisfied, and the corresponding revenue is recognized, at a distinct point in time 
when an ad renders. The Company does not have arrangements with multiple performance obligations. 

The Company reports revenue on a net basis as it does not act as the principal in the purchase and sale of digital advertising 
inventory because it does not have control of the digital advertising inventory and does not set prices agreed upon within the auction 
marketplace. In periods prior to the second quarter of 2017, the Company reported revenue on a gross basis for revenue associated 
with its intent marketing solution, as the Company determined that it acted as the principal in the purchase and sale of digital 
advertising inventory. The Company ceased offering its intent marketing solution after the first quarter of 2017, after which time, all 
of the Company’s revenues have been recorded on a net basis. Revenue generated by the Company’s intent marketing solution in 
2017 prior to its cessation was $1.3 million, which is included in total revenue for the year ended December 31, 2017.  

Payment terms are specified in agreements between the Company and the buyers and sellers on its exchange platform. The 

Company generally bills buyers at the end of each month for the full purchase price of impressions filled in that month. The 
Company recognizes volume discounts as a reduction of revenue as they are incurred. Specific payment terms may vary by 
agreement, but are generally seventy-five days or less. The Company's accounts receivable are recorded at the amount of gross 
billings to buyers, net of allowances for the amounts the Company is responsible to collect. The Company's accounts payable related 
to amounts due to sellers are recorded at the net amount payable to sellers (see Note 11). Accordingly, both accounts receivable and 
accounts payable appear large in relation to revenue reported on a net basis.

The following table presents our revenue by channel for the years ended December 31, 2018 and 2017:

Year Ended

December 31, 2018

December 31, 2017

(in thousands, except percentages)

$

$

59,039

65,646

124,685

47% $

53

84,327

71,218

100% $

155,545

54%

46

100%

Channel:

Desktop

Mobile

Total

sellers:

The following table presents our revenue disaggregated by geographic location, based on the location of the Company's 

United States

International

Total

Year Ended

December 31, 2018

December 31, 2017

$

$

(in thousands)

83,020

41,665

124,685

$

$

95,567

59,978

155,545

87

Note 5—Fair Value Measurements 

Recurring Fair Value Measurements 

Fair value represents the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in 

the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the 
measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the 
use of unobservable inputs. Observable inputs are based on market data obtained from independent sources. The fair value hierarchy 
is based on the following three levels of inputs, of which the first two are considered observable and the last one is considered 
unobservable: 

•

•

•

Level 1 – Quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the
ability to access at the measurement date.

Level 2 – Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either
directly or indirectly.

Level 3 – Unobservable inputs.

The table below sets forth a summary of financial instruments that are measured at fair value on a recurring basis at 

December 31, 2018:

Cash equivalents

U.S. Treasury, government and agency
debt securities

Total

$

$

13,692

7,524

$

$

Quoted Prices in
Active Markets for
Identical Assets
(Level 1)

Significant Other
Observable Inputs
(Level 2)

Significant
Unobservable Inputs 
(Level 3)

13,692

(in thousands)
$

7,524

$

— $

— $

—

—

The table below sets forth a summary of financial instruments that are measured at fair value on a recurring basis at 

December 31, 2017:

Cash equivalents

Corporate debt securities

U.S. Treasury, government and agency
debt securities

Total

$

$

$

1,807

25,098

29,901

$

$

$

Quoted Prices in
Active Markets for
Identical Assets
(Level 1)

Significant Other
Observable Inputs
(Level 2)

Significant
Unobservable Inputs 
(Level 3)

(in thousands)
$

210

— $

1,597

25,098

$

$

29,901

$

— $

—

—

—

At December 31, 2018 and 2017, cash equivalents of $13.7 million and $1.8 million, respectively, consisted of money 

market funds and commercial paper, with original maturities of three months or less. The carrying amounts of cash equivalents are 
classified as Level 1 or Level 2 depending on whether or not their fair values are based on quoted market prices for identical 
securities that are traded in an active market. The commercial paper included in cash equivalents at December 31, 2017 is classified 
as Level 2 since its fair value is not based on quoted market prices for identical securities that are traded in an active market, but 
rather is derived from similar securities. Corporate debt securities (which are included in marketable securities on the balance sheet) 
with fair values derived from similar securities rather than based on quoted market prices for identical securities, are classified as 
Level 2 as well. The fair values of the Company's U.S. treasury, government and agency debt securities are based on quoted market 
prices and classified as Level 1, and are included within marketable securities.

There were no transfers between Level 1 and Level 2 fair value measurements during the year ended December 31, 2018 

and 2017. 

Non-Recurring Fair Value Measurements

Impairment of Goodwill 

During the third quarter of 2017, the Company identified potential indications of impairment, which triggered a 

quantitative goodwill impairment assessment. The Company compared the fair value of its net assets, calculated using three 
valuation methodologies, to the carrying value of the net assets. The fair value of the Company's net assets falls within Level 3 of 

88

the fair value hierarchy, as it was determined using unobservable inputs and relied on assumptions and estimates made by the 
Company's management. The valuation process is described below:

Income Approach. The Company first estimated the fair value of its net assets based on an income approach using 

the 2017 remaining year forecast, projections for growth from that base, and a terminal growth rate. The cash flows were 
discounted using the Company's estimated weighted average cost of capital rate of 16.2%. The value of net operating losses 
and the excess working capital were then added to the discounted cash flows to arrive at the income approach fair value of 
the Company's net assets. 

Market Approach. The market approach used to determine the fair value of the Company's net assets was based 

upon a review of private and public company control transactions involving comparable companies. The Company 
performed two analyses under the market approach—a control premium analysis and a similar transaction analysis. In 
each of these analyses, the Company identified merger or acquisition transactions that were completed over the past three 
years involving targets that operate within the “Advertising” or “Internet Software and Services” industries and where the 
buyer was a strategic buyer. In the control premium analysis, the Company calculated a control premium paid in each of 
these transactions. After analyzing the comparable transactions, the Company applied a control premium of 15% to its 
adjusted public equity value to derive the fair value of its net assets. An additional method under the market approach, the 
similar transactions method, was utilized to determine the fair value of the Company's net assets under a strategic buyer 
purchase scenario. In this analysis, target companies were compared to the Company and multiples paid in transactions, 
specifically EBITDA, were analyzed and applied to the Company's adjusted EBITDA for the twelve months ended 
September 30, 2017. Based on the results of this analysis, an adjusted EBITDA multiple of 2.0x was applied to calculate 
the fair value of the Company's net assets. In determining the comparability of publicly-traded companies, several factors 
were analyzed, including products and solutions, markets, growth patterns, relative size, earnings trends and other 
financial characteristics.  

The Company compared the fair value of its net assets using the three methodologies (one income approach and two 
market approaches) described above, to the carrying value and determined that its goodwill was fully impaired. The Company 
recorded an impairment of $90.3 million to adjust its goodwill balance to its fair value of zero.

Impairment of Intangible Assets and Internal Use Software 

The Company measures impairment loss based on the difference between the carrying amount and estimated fair value. In 
the fourth quarter of 2017, we performed a cash flow analysis of our Guaranteed Orders workflow tool that resulted in impairment 
charges of the related intangible assets and long lived assets totaling $3.5 million and $1.1 million, respectively. The intangible 
assets included developed technology and client relationships acquired as part of an acquisition completed in 2014. The fair value of 
the asset group was determined based on a discounted cash flow method, which reflected estimated future cash flows associated 
with the identified asset group at the measurement date, and falls within Level 3 of the fair value hierarchy. The asset group was 
determined to be fully impaired and the assets were written down to their fair values of zero. 

For the year ended December 31, 2018, no impairments were recorded on the Company's assets required to be measured at 

fair value on a non-recurring basis.

Note 6—Investments

Investments in marketable securities as of December 31, 2018 consisted of the following:

Amortized
Cost

Gross
Unrealized
Gains

Gross
Unrealized
Losses

(in thousands)

Fair
Value

Available-for-sale—short-term:

U.S. Treasury, government and agency debt securities

$

7,526

$

— $

(2) $

7,524

The Company's available-for-sale securities had a weighted remaining contractual maturity of 0.1 years as of 

December 31, 2018. During the year ended December 31, 2018, the Company sold $9.2 million of available-for-sale investments, 
on which the realized gains were de minimis and there were no unrealized holding gains (losses) reclassified out of accumulated 
other comprehensive loss into the consolidated statements of operations. The Company had no sales of available-for-sale 
investments in 2017. As of December 31, 2018, all of the Company's marketable securities had contractual maturities of less than 
one year.

89

Investments in marketable securities as of December 31, 2017 consisted of the following:

Available-for-sale—short-term:

U.S. Treasury, government and agency debt securities

Corporate debt securities

Total

Available-for-sale—long-term:

U.S. Treasury, government and agency debt securities

Note 7—Property and Equipment

Major classes of property and equipment were as follows:

Amortized
Cost

Gross
Unrealized
Gains

Gross
Unrealized
Losses

Fair
Value

(in thousands)

$

$

$

27,426

25,098
52,524

2,504

$

$

$

— $

—
— $

(20) $

—
(20) $

27,406

25,098

52,504

— $

(9) $

2,495

December 31, 2018

December 31, 2017

Purchased software
Computer equipment and network hardware
Furniture, fixtures and office equipment
Leasehold improvements

Gross property and equipment

Accumulated depreciation

Net property and equipment

$

$

$

(in thousands)
1,254
98,884
1,973
2,571
104,682
(71,195)
33,487

$

1,985
90,695
2,165
3,325
98,170
(50,777)
47,393

Depreciation expense on property and equipment totaled $25.0 million and $20.3 million for the years ended December 31, 

2018 and 2017, respectively. There were no impairment charges to property and equipment for the years ended December 31, 2018 
and 2017.

At December 31, 2018 and 2017, the Company had no property and equipment under capital leases. 

The Company's property and equipment, net by geographical region was as follows:

United States

International
Total

Note 8—Internal Use Software Development Costs

Internal use software development costs were as follows:

Internal use software development costs, gross
Accumulated amortization

Internal use software development costs, net

December 31, 2018

December 31, 2017

$

$

(in thousands)

24,928

8,559

33,487

$

$

37,566

9,827

47,393

December 31, 2018

December 31, 2017

(in thousands)

41,882
(27,312)
14,570

$

$

33,414
(20,680)
12,734

$

During the years ended December 31, 2018 and 2017, the Company capitalized $9.0 million and $8.4 million, respectively, 

of internal use software development costs. Amortization expense was $7.2 million and $11.1 million for the years ended 
December 31, 2018 and 2017, respectively. In the years ended December 31, 2018 and 2017, amortization expense included the 
write-off of software development costs of $0.5 million and $1.6 million, in the respective periods. Based on the Company’s internal 

90

use software development costs at December 31, 2018, estimated amortization expense of $7.0 million, $5.1 million and $2.5 
million is expected to be recognized in 2019, 2020 and 2021, respectively.

In the fourth quarter of 2017, the Company recognized an impairment of the remaining capitalized software asset related to 

its Guaranteed Orders workflow tool of $1.1 million, which is included within impairment of intangible assets and internal use 
software on the consolidated statements of operations (see Note 5 for additional valuation details). There were no impairment 
charges to internal use software development costs for the year ended December 31, 2018. 

Note 9—Goodwill and Intangible Assets

Throughout 2017, the Company experienced a decrease in its stock price and market capitalization. During the third 
quarter of 2017, there were also certain developments that negatively impacted the Company's near-term business outlook, including 
the strategic decision to make reductions in the fees the Company charges buyers in open market waterfall RTB transactions, header 
bidding, and direct pressure from buyers and sellers, which accelerated dramatically in 2017. The Company concluded that these 
developments, together with the continued decline in the Company's market capitalization below the carrying value of its net assets, 
represented an indication of impairment that triggered the Company to perform a quantitative valuation assessment of its goodwill. 
The Company, with the assistance of a valuation consultant, performed a fair value assessment of its net assets using fair values 
derived from income and market approaches and weighted the outcomes. The fair value of its net assets was compared to the 
carrying value of $274.4 million and, as the carrying value exceeded the estimated fair value, the Company recorded an impairment 
charge of $90.3 million during the third quarter of 2017. For additional details regarding the valuation assessment process, refer to 
Note 5.

The Company no longer had a goodwill balance following the goodwill impairment. Activity of the Company’s goodwill 

for the year ended December 31, 2017 was as follows:

Beginning balance

Additions from the acquisition of nToggle (See Note 10)

Impairment of goodwill

Ending balance

The Company’s intangible assets as of December 31, 2018 and 2017 included the following:

December 31, 2017

(in thousands)

$

$

65,705

24,546

(90,251)

—

Amortizable intangible assets:

Developed technology

Non-compete agreements

Trademarks

Total identifiable intangible assets, gross

Accumulated amortization—intangible assets:

Developed technology

Non-compete agreements

Trademarks

Total accumulated amortization—intangible assets

Total identifiable intangible assets, net

December 31, 2018

December 31, 2017

(in thousands)

$

16,878

$

16,878

690

20

17,588

(6,888)
(506)
(20)
(7,414)
10,174

$

690

20

17,588

(4,062)

(161)

(6)

(4,229)

13,359

$

Amortization of intangible assets for the years ended December 31, 2018 and 2017 was $3.2 million and $4.8 million, 

respectively. 

In the fourth quarter of 2017, the Company recognized an impairment charge of the remaining intangible assets associated 
with its Guaranteed Orders workflow tool, totaling $3.5 million. These intangible assets included developed technology and client 
relationships acquired as part of an acquisition completed in 2014. See Note 5 for additional information.

91

The estimated remaining amortization expense associated with the Company's intangible assets was as follows as of 

December 31, 2018:

Fiscal Year

2019

2020

2021

2022

2023

Thereafter

Total

$

Amount

(in thousands)

3,010

2,826

2,826
1,512

—

—

$

10,174

Note 10—Business Combinations

2017 Acquisition—nToggle, Inc.

On July 14, 2017, the Company completed the merger of nToggle, Inc. ("nToggle") with Caviar Acquisition Corp., a 

wholly owned subsidiary of the Company, with nToggle surviving as a wholly owned subsidiary of Rubicon Project. nToggle was a 
Boston, Massachusetts based programmatic advertising company with traffic-shaping technology. The primary reason for the 
acquisition was to acquire technology, know-how and personnel that will enable the Company to offer services that make it easier 
and more cost-effective for buyers to find the inventory they seek among the billions of bid requests they receive. At closing, the 
Company paid net cash consideration of $38.6 million, which represents total purchase consideration of $40.6 million less acquired 
cash and cash equivalents of $2.0 million, to the stockholders, warrantholders, and holders of vested in-the-money options of 
nToggle. In addition, the Company assumed 432,482 outstanding unvested in-the-money options and 77,499 shares of restricted 
stock held by continuing employees, and issued an aggregate of 174,117 restricted stock units to the continuing employees under the 
Company's 2014 Inducement Grant Equity Incentive Plan. The financial results of nToggle have been included in our consolidated 
financial statements since the date of the acquisition.

The major classes of assets and liabilities to which the Company allocated the purchase price were as follows as of the 

acquisition date: 

Cash and cash equivalents
Accounts receivable
Prepaid and other assets
Fixed assets
Other non-current assets
Intangible assets
Goodwill

Total assets acquired

Accounts payable and accrued expenses
Deferred revenue
Deferred tax liability, net

Total liabilities assumed
Total net assets acquired

Amount

(in thousands)

1,953
256
18
763
82
14,840
24,546
42,458
78
91
1,719
1,888
40,570

$

$

The Company recognized approximately $0.3 million of acquisition-related costs during the year ended December 31, 

2017 that are included within general and administrative expenses in the Company’s consolidated statements of operations. As part 
of the acquisition of nToggle, the Company acquired nToggle's net operating losses of approximately $9.3 million. In addition, the 
Company recorded deferred tax liabilities related to acquired intangibles of $5.5 million net of deferred tax assets of $3.8 million 
primarily related to net operating loss carryforwards.

92

The following table summarizes the components of the acquired intangible assets and estimated useful lives (in thousands, 

except for estimated useful life):

Developed technology
Non-compete agreements
Trademark & trade name
Total intangible assets acquired

December 31, 2017
14,130
$
690
20
14,840

$

Estimated Useful
Life
5 years
2 years
1.5 years

The intangible assets are amortized on a straight-line basis, which approximates the pattern in which the economic benefits 

are consumed, over their estimated useful lives. Amortization of developed technology is included in cost of revenue, the 
amortization related to non-compete agreements is included in technology and development, and amortization related to trademark 
and trade name is included in general and administrative.

Goodwill resulting from the acquisition was primarily attributable to acquired workforce, an increase in development 

capabilities, increased offerings to clients, and enhanced opportunities for growth and innovation. Refer to Note 5 for a description 
of the methods used to compute the charge for the impairment of consolidated goodwill of $90.3 million recorded in the third 
quarter of 2017. The acquired intangibles and goodwill resulting from the nToggle acquisition are not amortizable for tax purposes.

Unaudited Pro Forma Information - nToggle Acquisition

The following table provides unaudited condensed pro forma information to give effect to the nToggle acquisition as if it 

had occurred on January 1, 2017. The unaudited pro forma information reflects adjustments for additional amortization resulting 
from the fair value adjustments to assets acquired and liabilities assumed. The pro forma results do not include any anticipated cost 
synergies or other effects of the integration of nToggle. Accordingly, pro forma amounts are not necessarily indicative of the results 
that actually would have occurred had the acquisition been completed on the date indicated, nor are they indicative of the actual or 
future operating results of the combined company.

Pro forma revenues

Pro forma net loss

Pro forma net loss per share, basic

Pro forma net loss per share, diluted

Year Ended

December 31, 2017

(in thousands)

$

$

$

$

156,480

(158,443)

(3.24)

(3.24)

nToggle's technology was fully integrated into the Company's platform, and its pre-acquisition product is not offered on a 
stand-alone basis. As a result, the determination of nToggle's post-acquisition revenue and operating results on a stand-alone basis 
was impracticable.

Note 11—Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses included the following:

Accounts payable—seller

Accounts payable—trade

Accrued employee-related payables

Total

December 31, 2018

December 31, 2017

(in thousands)

230,423

$

203,694

3,122

6,133

3,764

6,645

239,678

$

214,103

$

$

93

Note 12—Accumulated Other Comprehensive Income (Loss)

The components of accumulated other comprehensive income (loss) were as follows (in thousands):

Balance at December 31, 2016

Other comprehensive income (loss)

Balance at December 31, 2017

Other comprehensive income (loss)

Balance at December 31, 2018

Note 13—Stock-Based Compensation

Unrealized Gain (Loss) on
Investments, net of tax

Foreign Currency
Translation

Accumulated Other
Comprehensive Income
(Loss)

$

$

(1) $
(28)
(29)
27
(2) $

(272) $
342

70
(327)
(257) $

(273)

314

41

(300)

(259)

In connection with its IPO, the Company implemented its 2014 Equity Incentive Plan, which governs equity awards made 

to employees and directors of the Company since the IPO. Prior to the IPO, the Company granted equity awards under its 2007 
Stock Incentive Plan, which governs equity awards made to employees and contractors under the plan. In November 2014, the 
Company approved the 2014 Inducement Grant Equity Incentive Plan (the "Inducement Plan"), which governs certain equity 
awards made to certain employees in connection with commencement of employment. In connection with the Company's 
acquisitions of Chango Inc. ("Chango") and iSocket, Inc. ("iSocket"), it assumed the existing employee equity award plans, the 2009 
Chango Stock Option Plan (the "Chango Plan") and the 2009 Equity Incentive Plan - iSocket (the "iSocket Plan"). As part of the 
nToggle acquisition in July 2017, the Company assumed all unvested in-the-money options and restricted stock held by continuing 
employees under the nToggle, Inc. 2014 Equity Incentive Plan ("nToggle Plan") (see Note 10). All compensatory equity awards 
outstanding at December 31, 2018 were issued pursuant to the 2014 Equity Incentive Plan, the iSocket Plan, the Chango Plan, the 
nToggle Plan, the Inducement Plan, or the Company's 2007 Stock Incentive Plan. 

The Company’s equity incentive plans provide for the grant of equity awards, including non-statutory or incentive stock 
options, restricted stock awards, and restricted stock units, to the Company's employees, officers, directors, and consultants. The 
Company's board of directors administers the plans. Options outstanding vest based upon continued service at varying rates, but 
generally over four years from issuance with 25% vesting after one year of service and the remainder vesting monthly thereafter. 
Restricted stock awards and restricted stock units vest at varying rates, typically approximately 25% vesting after approximately one 
year of service and the remainder vesting semi-annually thereafter. The restricted stock units granted in 2018 included 2,800,000 
restricted stock units that vest 50% on each of the first and second anniversaries of the grant date. Options, restricted stock awards, 
and restricted stock units granted under the plans accelerate under certain circumstances for certain participants upon on a change in 
control, as defined in the governing plan. No further awards were made under the iSocket Plan, the Chango Plan, the nToggle Plan, 
or the 2007 Stock Incentive Plan; available shares under the iSocket Plan, the Chango Plan, and the nToggle Plan were rolled into 
the available share pool under the 2014 Equity Incentive Plan at the time of acquisition of each company, and available shares under 
the 2007 Stock Incentive Plan were rolled into the available share pool under the 2014 Equity Incentive Plan at the time of the IPO. 
An aggregate of 6,701,872 shares remained available for future issuance at December 31, 2018 under the plans. The 2014 Equity 
Incentive Plan has an evergreen provision pursuant to which the share reserve will automatically increase on January 1st of each year 
in an amount equal to 5% of the total number of shares of capital stock outstanding on December 31st of the preceding calendar year, 
although the Company’s board of directors may provide for a lesser increase, or no increase, in any year. The 2014 Inducement 
Grant Equity Incentive Plan has a provision pursuant to which the share reserve may be increased at the discretion of the Company's 
board of directors.

94

Stock Options 

A summary of stock option activity for the year ended December 31, 2018 is as follows:

Outstanding at December 31, 2017

Granted

Exercised
Expired

Forfeited

Outstanding at December 31, 2018

Exercisable at December 31, 2018

Shares Under
Option

(in thousands)

Weighted-
Average Exercise
Price

Weighted-
Average
Contractual Life

Aggregate
Intrinsic Value

(in thousands)

4,363

$

706
$
(50) $
(1,438) $
(93) $
$

3,488

2,114

$

8.75

2.09

0.91

10.17

3.83

7.06

9.29

7.09 years

6.07 years

$

$

2,354

765

The total intrinsic values of options exercised during the year ended December 31, 2018 was $0.1 million. At 
December 31, 2018, the Company had unrecognized employee stock-based compensation expense relating to nonvested stock 
options of approximately $3.2 million, which is expected to be recognized over a weighted-average period of 2.5 years. The 
weighted-average grant date fair value per share of stock options granted during the year ended December 31, 2018 was $1.15. Total 
fair value of options vested during the year ended December 31, 2018 was $3.3 million.

The Company estimates the fair value of stock options that contain service and/or performance conditions using the Black-

Scholes option pricing model. The weighted-average input assumptions used by the Company were as follows: 

Expected term (in years)

Risk-free interest rate

Expected volatility

Dividend yield

Restricted Stock Awards 

Year Ended

December 31, 2018

December 31, 2017

6.0

2.67%

57%

—%

5.8

2.03%

57%

—%

A summary of restricted stock activity for the year ended December 31, 2018 is as follows: 

Nonvested shares of restricted stock outstanding at December 31, 2017

Granted

Canceled

Vested

Nonvested shares of restricted stock outstanding at December 31, 2018

Weighted-Average
Grant Date Fair
Value

Number of Shares

(in thousands)

558

$

— $
(156) $
(205) $
$
197

12.60

—

13.82

12.19

12.06

The aggregate fair value of restricted stock awards with service conditions that vested during the year ended December 31, 

2018 was $0.6 million. At December 31, 2018, the Company had unrecognized stock-based compensation expense for restricted 
stock awards with service conditions of $0.9 million, which is expected to be recognized over a weighted-average period of 1.1 
years. 

95

Restricted Stock Units

A summary of restricted stock unit activity for the year ended December 31, 2018 is as follows: 

Nonvested restricted stock units outstanding at December 31, 2017

Granted

Canceled

Vested

Nonvested restricted stock units outstanding at December 31, 2018

Weighted-Average
Grant Date Fair
Value

Number of Shares

(in thousands)

3,609

$

4,976
$
(1,118) $
(1,367) $
$
6,100

7.55

2.30

5.32

8.06

3.56

  The weighted-average grant date fair value per share of restricted stock units granted during the year ended December 31, 

2018 was $2.30. The aggregate fair value of restricted stock units that vested during year ended December 31, 2018 was $4.3 
million. At December 31, 2018, the intrinsic value of nonvested restricted stock units was $22.8 million. At December 31, 2018, the 
Company had unrecognized stock-based compensation expense relating to nonvested restricted stock units of approximately $17.3 
million, which is expected to be recognized over a weighted-average period of 2.1 years. 

Employee Stock Purchase Plan

In November 2013, the Company adopted the Company's 2014 Employee Stock Purchase Plan ("ESPP"). The ESPP is 

designed to enable eligible employees to periodically purchase shares of the Company's common stock at a discount through payroll 
deductions of up to 10% of their eligible compensation, subject to any plan limitations. At the end of each six-month offering 
period, employees are able to purchase shares at a price per share equal to 85% of the lower of the fair market value of the 
Company's common stock on the first trading day of the offering period or on the last trading day of the offering period. Offering 
periods generally commence and end in May and November of each year.

As of December 31, 2018, the Company has reserved 1,607,646 shares of its common stock for issuance under the ESPP. 
The ESPP has an evergreen provision pursuant to which the share reserve will automatically increase on January 1st of each year in 
an amount equal to 1% of the total number of shares of capital stock outstanding on December 31st of the preceding calendar year, 
although the Company’s board of directors may provide for a lesser increase, or no increase, in any year.

Stock-Based Compensation Expense 

Total stock-based compensation expense recorded in the consolidated statements of operations was as follows:  

Cost of revenue

Sales and marketing

Technology and development

General and administrative

Restructuring and other exit costs

Total stock-based compensation expense

Note 14—Restructuring and Other Exit Costs

Year Ended

December 31, 2018

December 31, 2017

$

$

(in thousands)

321

$

4,557

2,867

8,139

398

404

4,582

4,034

9,924

1,560

16,282

$

20,504

As part of its on-going efforts to control costs and create efficiencies, the Company underwent restructuring events 
throughout 2017 and in the first quarter of 2018. The objective of these restructuring activities was to streamline operations, 
prioritize resources for growth initiatives and increase profitability.

For the year ended December 31, 2017, the Company recognized $6.0 million of restructuring and other exit costs 
expenses related to the cessation of it's intent marketing solution, including the closure of the Toronto office, as well as the 
realignment of the management team to a more cost efficient structure (collectively, the "2017 Restructuring Events"). A majority of 

96

the costs incurred in the year ended December 31, 2017 were severance and one-time termination benefit costs, of which $1.6 
million related to non-cash stock-based compensation, the remainder of which related to facility closure costs.

In the first quarter of 2018, the Company announced its restructuring plan to reduce headcount to bring the Company's 

general and administrative operations into better alignment with the current size of the business and de-layer certain functions, and 
to reduce its investment in unprofitable projects (the "2018 Restructuring Events"). During the year ended December 31, 2018, the 
Company incurred restructuring and other exit costs expenses of $3.4 million for severance and one-time termination benefits.

The following table summarizes restructuring and other exit cost activity for the 2018 Restructuring Events (in thousands):

Accrued restructuring and other exit costs at December 31, 2017

Restructuring and other exit costs

Cash paid for restructuring and other exit costs

Non-cash stock-based compensation for restructuring and other exit costs

Accrued restructuring and other exit costs at December 31, 2018

$

$

—

3,440

(2,975)

(398)

67

Accrued restructuring costs related to the 2017 Restructuring Events were $0.1 million at December 31, 2017 and were 

paid in the first half of 2018. Accrued restructuring costs are included within other liabilities on the Company's consolidated balance 
sheets. 

The following table presents the components of restructuring and other exit costs for the years ended December 31, 2018 

and 2017 (in thousands): 

Employee termination costs

Facility closing costs

Total restructuring and other exit costs

Note 15—Income Taxes

Year Ended

December 31, 2018

December 31, 2017

$

$

3,440

—

3,440

$

$

5,753

206

5,959

The following are the domestic and foreign components of the Company’s income (loss) before income taxes for the years 

ended December 31, 2018 and 2017:

Domestic
International

Loss before income taxes

Year Ended

December 31, 2018

December 31, 2017

$

$

(in thousands)

(62,292) $
827
(61,465) $

(104,750)

(51,795)

(156,545)

97

The following are the components of the provision (benefit) for income taxes for the years ended December 31, 2018 and 

2017:

Current:

Federal

State

Foreign

Total current provision

Deferred:

Federal

State

Foreign

Total deferred benefit

Total provision (benefit) for income taxes

Year Ended

December 31, 2018

December 31, 2017

(in thousands)

$

$

(23) $
41

388

406

—

2
(51)
(49)
357

$

(140)

78

(250)

(312)

(1,877)

288

139

(1,450)

(1,762)

The Company recorded an income tax expense of $0.4 million for the year ended December 31, 2018 and an income tax 

benefit of $1.8 million for the year ended December 31, 2017. The tax provision for the year ended December 31, 2018 is primarily 
the result of the domestic valuation allowance and the tax liability associated with the foreign subsidiaries.

During the fourth quarter of 2017, the Company recorded a tax deduction of $145.8 million and increased its valuation 

allowance by a corresponding amount, resulting in no net tax benefit related to a worthless stock deduction generated by the 
Company's exit from its intent marketing business activities in Canada.

On December 22, 2017, the U.S. government enacted the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act includes 

significant changes to the U.S. corporate income tax system including the following: a federal corporate rate reduction from 34% to 
21%; limitations on the deductibility of executive compensation and research and development (“R&D”) expenditures; temporary 
immediate expensing of qualified property; the creation of new minimum taxes such as the base erosion anti-abuse tax (“BEAT”) 
and Global Intangible Low Taxed Income (“GILTI”) tax; and the transition of U.S. international taxation from a worldwide tax 
system to a modified territorial tax system, which resulted in a one time U.S. tax liability on those earning which had not previously 
been repatriated to the U.S. (the “Transition Tax”).

The Tax Act imposes a Transition Tax on previously untaxed accumulated and current earnings and profits (“E&P”) of 

certain of our foreign subsidiaries. To determine the amount of the Transition Tax, the Company determined, among other things, 
the amount of post-1986 E&P of the relevant subsidiaries. The Company recorded a provisional Transition Tax of $0.6 million, 
which reduced its U.S. net deferred tax assets for the year ended December 31, 2017. We completed our analysis of the impact of 
U.S. tax reform during 2018, and for the year ended December 31, 2018, there was no change to the Transaction Tax recorded in the 
prior period.

The Tax Act also reduced the U.S. corporate tax rate from 34% to 21%, effective January 1, 2018. Consequently, the 

Company recorded a decrease to its tax effected U.S. net deferred tax assets of $31.6 million, with a corresponding decrease to the 
U.S. valuation allowance for the year ended December 31, 2017 as a result of re-measuring net deferred tax assets at the new lower 
corporate tax rate of 21%.

The Tax Act requires certain GILTI income earned by controlled foreign corporations (“CFCs”) to be included in the gross 

income of the CFCs’ U.S. shareholder (for tax years beginning after December 31, 2017). For the year ended December 31, 2018, 
the Company has included a GILTI inclusion of $1.3 million, which was incorporated in the calculation of the tax provision. 

98

Set forth below is a reconciliation of the components that caused the Company’s provision (benefit) for income taxes to 

differ from amounts computed by applying the U.S. Federal statutory rate of 21% for the year ended December 31, 2018 and 34% 
for the year ended December 31, 2017:

U.S. federal statutory income tax rate

State income taxes, net of federal benefit

Foreign income (loss) at other than U.S. rates

Stock-based compensation expense

Meals and entertainment

Goodwill impairment

Research and development tax credits

Debt cancellation

Worthless stock

Other permanent items

Change in valuation allowance

Tax rate change; U.S. tax reform
Effective income tax rate

Year Ended

December 31, 2018

December 31, 2017

21.0 %

(0.1)%

— %

(5.3)%

(0.4)%

— %

— %

(1.2)%

— %

(0.5)%

(14.1)%

— %
(0.6)%

34.0 %

— %

0.2 %

(3.8)%

(0.1)%

(19.0)%

0.8 %

— %

31.7 %

(0.5)%

(22.0)%

(20.2)%
1.1 %

Set forth below are the tax effects of temporary differences that give rise to a significant portion of the deferred tax assets 

and deferred tax liabilities as of December 31, 2018 and 2017:

Deferred Tax Assets:
Accrued liabilities

Stock-based compensation

Net operating loss carryovers

Tax credit carryovers

Other

Total deferred tax assets

Less valuation allowance

Deferred tax assets, net of valuation allowance

Deferred Tax Liabilities:

Fixed assets

Intangible assets

Other

Total deferred tax liabilities

Net deferred tax assets (liability)

December 31, 2018

December 31, 2017

(in thousands)

$

916

$

2,623

76,098

13,206

1,053

93,896
(90,959)
2,937

(2,352)
(152)
—
(2,504)
433

$

$

2,648

3,685

65,648

13,494

1,502

86,977

(81,767)

5,210

(3,864)

(955)

—

(4,819)

391

The change in valuation allowance for the years ended December 31, 2018 and 2017 was $9.2 million and $42.3 million, 

respectively.

At December 31, 2018, the Company had U.S. federal net operating loss carryforwards, or NOLs, of approximately $285.5 
million, which will begin to expire in 2027. At December 31, 2018, the Company had state NOLs of approximately $167.0 million, 
which will begin to expire in 2027. At December 31, 2018, the Company had foreign NOLs of approximately $20.5 million, which 
will begin to expire in 2026. At December 31, 2018, the Company had federal research and development tax credit carryforwards, or 
credit carryforwards, of approximately $10.2 million, which will begin to expire in 2027. At December 31, 2018, the Company had 
state research and development tax credits of approximately $8.0 million, which carry forward indefinitely. No amounts for any 
federal or state research and development tax credits for the year ended December 31, 2018 are included herein.

99

Utilization of certain NOLs and credit carryforwards may be subject to an annual limitation due to ownership change 

limitations set forth in the Internal Revenue Code of 1986, as amended, or the Code, and comparable state income tax laws. Any 
future annual limitation may result in the expiration of NOLs and credit carryforwards before utilization. A prior ownership change 
and certain acquisitions resulted in the Company having NOLs subject to insignificant annual limitations. 

Additionally, for tax years beginning after December 31, 2017, the Tax Act limits the NOL deduction to 80% of taxable 

income, repeals carryback of all NOLs arising in a tax year ending after 2017, and permits indefinite carryforward for all such 
NOLs. NOL’s arising in a tax year ending in or before 2017 can offset 100% of taxable income, are available for carryback, and 
expire 20 years after they arise.

At December 31, 2018, unremitted earnings of the subsidiaries outside of the United States were approximately $7.6 

million, on which the Company recorded a transition tax of $0.6 million, as discussed above. The Company’s intention is to 
indefinitely reinvest these earnings outside the United States. Upon distribution of those earnings in the form of a dividend or 
otherwise, the Company would be subject to withholding taxes payable to various foreign countries and, potentially, various state 
taxes. The amounts of such tax liabilities that might be payable upon actual repatriation of foreign earnings, after consideration of 
corresponding foreign tax credits, are not material.

The following table summarizes the activity related to the unrecognized tax benefits (in thousands):

Balance as of December 31, 2016

Increases related to 2017 tax positions

Decreases related to prior year tax positions

Balance as of December 31, 2017

Increases related to current year tax positions

Decreases related to current year tax positions

Decreases related to prior year tax positions

Balance as of December 31, 2018

Amount

(in thousands)

5,027

619

—

5,646

—

—

(929)

4,717

$

$

Interest and penalties related to the Company’s unrecognized tax benefits accrued at December 31, 2018 and 2017 were not 

material.

Due to the net operating loss carryforwards, the Company's United States federal and a majority of its state returns are open 

to examination by the Internal Revenue Service and state jurisdictions for all years since inception. For Australia, Brazil, Canada, 
Germany, Italy, Japan, Singapore, and the United Kingdom, all tax years remain open for examination by the local country tax 
authorities, while for France only 2014 forward are open for examination. During the first quarter of 2017, the Internal Revenue 
Service ("IRS") commenced an examination of the 2015 tax year. During 2018, the Company received an IRS Letter 1226 
indicating no change to the 2015 tax return as filed and concluded the examination.

The Company does not expect its uncertain income tax positions to have a material impact on its consolidated financial 

statements within the next twelve months.

Note 16—Commitments and Contingencies

Operating Leases 

The Company has commitments under non-cancelable operating leases for facilities, certain equipment, and its managed 
data center facilities. Total rental expenses were $12.6 million and $12.7 million for the years ended December 31, 2018 and 2017, 
respectively. Additionally, expenses for cloud-based services related to data centers were $7.1 million and $4.9 million for the years 
ended December 31, 2018 and 2017, respectively. As of December 31, 2018 and December 31, 2017, the Company had $2.9 
million of letters of credit associated with office leases available for borrowing, on which there were no outstanding borrowings as 
of either date.

100

The following table summarizes the Company's future minimum lease payments under non-cancelable operating leases and 

related sublease income at December 31, 2018:

2019

2020

2021

2022

2023

Total

Operating lease expense

Operating sublease income

Total

$

$

6,773

(285)

6,488

$

$

3,880
(194)
3,686

$

$

Guarantees and Indemnification

$

(in thousands)
1,734
(194)
1,540

$

1,019
(194)
825

$

$

597
(145)
452

$

$

14,003

(1,012)

12,991

The Company’s agreements with sellers, buyers, and other third parties typically obligate it to provide indemnity and 

defense for losses resulting from claims of intellectual property infringement, damages to property or persons, business losses, or 
other liabilities. Generally, these indemnity and defense obligations relate to the Company’s own business operations, obligations, 
and acts or omissions. However, under some circumstances, the Company agrees to indemnify and defend contract counterparties 
against losses resulting from their own business operations, obligations, and acts or omissions, or the business operations, 
obligations, and acts or omissions of third parties. For example, because the Company’s business interposes the Company between 
buyers and sellers in various ways, buyers often require the Company to indemnify them against acts and omissions of sellers, and 
sellers often require the Company to indemnify them against acts and omissions of buyers. In addition, the Company’s agreements 
with sellers, buyers, and other third parties typically include provisions limiting the Company’s liability to the counterparty, and the 
counterparty’s liability to the Company. These limits sometimes do not apply to certain liabilities, including indemnity obligations. 
These indemnity and limitation of liability provisions generally survive termination or expiration of the agreements in which they 
appear. The Company has also entered into indemnification agreements with its directors, executive officers and certain other 
officers that will require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of 
their status or service as directors, officers or employees. No material demands have been made upon the Company to provide 
indemnification under such agreements and there are no claims that the Company is aware of that could have a material effect on the 
Company’s consolidated financial statements. 

Litigation 

  The Company and its subsidiaries may from time to time be parties to legal or regulatory proceedings, lawsuits and other 

claims incident to their business activities and to the Company’s status as a public company. Such matters may include, among other 
things, assertions of contract breach or intellectual property infringement, claims for indemnity arising in the course of the 
Company’s business, regulatory investigations or enforcement proceedings, and claims by persons whose employment has been 
terminated. Such matters are subject to many uncertainties, and outcomes are not predictable with assurance. Consequently, 
management is unable to ascertain the ultimate aggregate amount of monetary liability, amounts which may be covered by insurance 
or recoverable from third parties, or the financial impact with respect to such matters as of December 31, 2018. However, based on 
management’s knowledge as of December 31, 2018, management believes that the final resolution of these matters known at such 
date, individually and in the aggregate, will not have a material adverse effect upon the Company’s consolidated financial position, 
results of operations or cash flows.

  On March 31, 2017, Guardian News & Media Limited ("Guardian") issued proceedings (the "Complaint") against the 
Company in the Chancery Division of the High Court of Justice in England & Wales. The Complaint alleged that the Company 
underpaid Guardian for digital advertising inventory sold by Guardian through the Company's platform as a result of the fact that 
the Company charged fees to buyers of that inventory. Guardian claimed the Company was precluded from charging buyer fees as a 
result of the contractual arrangements with Guardian and English agency law principles, as well as representations it allegedly made 
to Guardian. The Complaint claimed damages including loss of revenue, interest, and costs. On October 11, 2018, the Company and 
Guardian mutually agreed to resolve their dispute and the High Court proceedings have been discontinued. Though the terms of the 
settlement agreement are confidential, the settlement is immaterial to the Company from a financial standpoint.

Employment Contracts 

  The Company has entered into severance agreements with certain employees and officers. The Company may be required 

to pay severance and accelerate the vesting of certain equity awards in the event of involuntary terminations. 

Note 17—Debt

On September 26, 2018, the Company amended and restated its loan and security agreement with Silicon Valley Bank (the 

"Loan Agreement"), which was scheduled to expire on September 27, 2018. The Loan Agreement provides a senior secured 

101

revolving credit facility of up to $40.0 million with a maturity date of September 26, 2020. The amount available for borrowing as 
of December 31, 2018 is $30.0 million due to a $10.0 million reserve that will be released if the Company maintains positive 
Adjusted EBITDA for any trailing twelve-month period. The Company incurred $0.1 million of debt issuance fees that were 
capitalized and are being amortized over the term of the Loan Agreement.

An unused revolver fee in the amount of 0.15% per annum of the average unused portion of the revolver line is charged 

and is payable monthly in arrears. The Company may elect for advances to bear interest calculated by reference to prime or LIBOR. 
If the Company elects LIBOR, amounts outstanding under the amended credit facility bear interest at a rate per annum equal to 
LIBOR plus 2.50% if a streamline period applies or LIBOR plus 4.00% if a streamline period does not apply. If the Company elects 
prime, advances bear interest at a rate of prime plus 0.50% if a streamline period applies or prime plus 2.00% if a streamline period 
does not apply. A streamline period is any period during which an event of default does not exist and the Company's Adjusted Quick 
Ratio (as defined in the Loan Agreement) is at least 1.05 for each day in the preceding month.  

The Loan Agreement is collateralized by security interests in substantially all of the Company's assets. Subject to certain 
exceptions, the Loan Agreement restricts the Company's ability to, among other things, pay dividends, sell assets, make changes to 
the nature of the business, engage in mergers or acquisitions, incur, assume or permit to exist, additional indebtedness and 
guarantees, create or permit to exist, liens, make distributions or redeem or repurchase capital stock, or make other investments, 
engage in transactions with affiliates, make payments with respect to subordinated debt, and enter into certain transactions without 
the consent of the financial institution. If a streamline period is not in effect, the Company is required to maintain a lockbox 
arrangement where clients payments received in the lockbox will immediately reduce the amounts outstanding on the credit facility.

The Loan Agreement requires the Company to comply with financial covenants, including a minimum Adjusted Quick 

Ratio and the achievement of certain Adjusted EBITDA targets. On a monthly basis, or quarterly if there were no advances 
outstanding during the calendar quarter, the Company is required to maintain a minimum Adjusted Quick Ratio of: (i) 1.00 if the 
trailing six month adjusted EBITDA is $0 or less, or (ii) 0.90 if the trailing six month adjusted EBITDA is greater than $0. If the 
Company’s Adjusted Quick Ratio is 1.05 or greater, a streamline period applies. As of December 31, 2018, the Company's Adjusted 
Quick Ratio was 1.16, which is in compliance with its covenant requirement and is higher than the minimum Adjusted Quick Ratio 
required to qualify for a streamline period. The Company must also maintain the following trailing twelve month Adjusted EBITDA 
targets as of the end of each quarter as follows: (1) September 30, 2018 through June 30, 2019 Adjusted EBITDA must be within 
20% of the Adjusted EBITDA projections that were delivered to Silicon Valley Bank; (2) September 30, 2019 Adjusted EBITDA of 
$1 or greater; and (3) December 31, 2019 and thereafter, Adjusted EBITDA of $5.0 million or greater. As of December 31, 2018, the 
Company was in compliance with the Adjusted EBITDA covenant. 

The Loan Agreement also includes customary representations and warranties, affirmative covenants, and events of default, 
including events of default upon a change of control and material adverse change (as defined in the Loan Agreement). Following an 
event of default, SVB would be entitled to, among other things, accelerate payment of amounts due under the credit facility and 
exercise all rights of a secured creditor.

As of December 31, 2018, there were no amounts outstanding under the Loan Agreement. Future availability under the 

credit facility is dependent on several factors including the available borrowing base and compliance with future covenant 
requirements.

Note 18—Related Party Transactions

As of December 31, 2018 and 2017, there were no holders of more than 10% of the Company’s outstanding common stock 

that were considered to be related parties. During the years ended December 31, 2018 and 2017, the Company did not enter into 
transactions with any of its related parties.

Note 19—Quarterly Financial Data (Unaudited)

  The following tables set forth our quarterly consolidated statements of operations data for each of the eight quarters in the 
two-year period ended December 31, 2018. We have prepared the quarterly unaudited consolidated statements of operations data on 
a basis consistent with the audited consolidated financial statements included elsewhere in this Annual Report on Form 10-K. In the 
opinion of management, the financial information in these tables reflects all adjustments, consisting only of normal recurring 
adjustments, which management considers necessary for a fair statement of this data. This information should be read in conjunction 
with the audited consolidated financial statements and related notes included elsewhere in this Annual Report on Form 10-K. The 
results of historical periods are not necessarily indicative of the results for any future period.

102

Revenue

Expenses:

Cost of revenue

Sales and marketing

Technology and development

General and administrative

Restructuring and other exit costs

Impairment of intangible assets and
internally developed software

Impairment of goodwill

Total expenses

Loss from operations

Three Months Ended

Mar. 31,
2017

June 30,
2017

Sept. 30,
2017

Dec. 31,
2017

Mar. 31,
2018

June 30,
2018

Sept. 30,
2018

Dec. 31,
2018

(in thousands, except per share amounts)

$

46,015

$

42,922

$

35,211

$

31,397

$

24,876

$

28,648

$

29,729

$

41,432

14,688

14,628

12,753

15,080

4,338

—

—

13,698

12,529

12,044

14,355

1,621

—

—

61,487

54,247

12,985

12,503

11,580

13,644

—

—

90,251

140,963

15,465

12,134

11,123

12,517

—

4,585

—

55,824

14,783

12,257

10,494

12,544

2,466

—

—

15,044

11,135

9,245

11,441

974

—

—

14,687

10,654

9,299

9,355

—

—

—

52,544

47,839

43,995

(15,472)

(11,325)

(105,752)

(24,427)

(27,668)

(19,191)

(14,266)

15,489

10,510

8,825

9,091

—

—

—

43,915

(2,483)

(377)

(2,106)

124

Other (income) expense, net

(7)

84

(150)

(358)

73

(1,281)

(558)

Loss before income taxes

(15,465)

(11,409)

(105,602)

(24,069)

(27,741)

(17,910)

(13,708)

Provision (benefit) for income taxes

375

146

(2,031)

(252)

75

74

84

Net loss

Net loss per share:

Basic and diluted

$

$

Weighted-average shares used to compute
net loss per share:

(15,840) $

(11,555) $ (103,571) $

(23,817) $

(27,816) $

(17,984) $

(13,792) $

(2,230)

(0.33) $

(0.24) $

(2.11) $

(0.48) $

(0.56) $

(0.36) $

(0.27) $

(0.04)

Basic and diluted

48,332

48,783

49,055

49,293

49,692

50,071

50,513

50,746

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

Not applicable.

Item 9A. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the 

effectiveness of our disclosure controls and procedures as defined in Rule 13a-15(e) under the Exchange Act. Our disclosure 
controls and procedures are designed to provide reasonable assurance of achieving their objectives of ensuring that information we 
are required to disclose in the reports we file or submit under the Exchange Act is accumulated and communicated to our 
management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding 
required disclosures, and is recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and 
forms. There is no assurance that our disclosure controls and procedures will operate effectively under all circumstances. Based 
upon the evaluation described above, our Chief Executive Officer and Chief Financial Officer concluded that, as of December 31, 
2018, our disclosure controls and procedures were effective at the reasonable assurance level.

Changes in Internal Control over Financial Reporting

There have been no changes in our internal control over financial reporting that occurred during the three months ended 
December 31, 2018 that have materially affected, or are reasonably likely to materially affect, our internal control over financial 
reporting. 

Management's Report on Internal Control Over Financial Reporting

  Our management is responsible for establishing and maintaining adequate internal control over financial reporting (as 

defined in Rule 13a-15(f) of the Exchange Act). 

  Our management conducted an evaluation of the effectiveness of our internal control over financial reporting based on the 

framework in "Internal Control - Integrated Framework" (2013) issued by the Committee of Sponsoring Organizations of the 

103

Treadway Commission. Based on this evaluation, management concluded that the Company's internal control over financial 
reporting was effective as of December 31, 2018.

Inherent Limitations on Effectiveness of Controls 

Management recognizes that a control system, no matter how well designed and operated, can provide only reasonable, not 
absolute, assurance that the objectives of the control system are met. Further, the design of a control system must reflect the fact that 
there are resource constraints and that management is required to apply its judgment in evaluating the benefits of possible controls 
and procedures relative to their costs. Because of the inherent limitations in all control systems, no evaluation of controls can 
provide absolute assurance that all control issues and instances of fraud or error, if any, have been detected. These inherent 
limitations include the realities that judgments in decision making can be faulty, and that breakdowns can occur because of a simple 
error or mistake. Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more 
people, or by management override of the controls. The design of any system of controls also is based in part upon certain 
assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated 
goals under all potential future conditions; over time, controls may become inadequate because of changes in conditions, or the 
degree of compliance with policies or procedures may deteriorate. Because of the inherent limitations in a cost-effective control 
system, misstatements due to error or fraud may occur and not be detected.

Item 9B. Other Information

Not applicable.

PART III

Item 10. Directors, Executive Officers and Corporate Governance

The information required by Item 10 will be included in our Proxy Statement for the 2019 Annual Meeting of Stockholders 

to be filed with the SEC within 120 days of the fiscal year ended December 31, 2018, or the 2019 Proxy Statement, under the 
headings "Proposal 1—Election of Directors," "Section 16(a) Beneficial Ownership Reporting Compliance," and "Corporate 
Governance" and is incorporated herein by reference. 

Item 11. Executive Compensation

The information required by Item 11 will be included in the 2019 Proxy Statement under the headings "Executive Officers" 

and "Executive Compensation" and is incorporated herein by reference.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

The information required by Item 12 will be included in the 2019 Proxy Statement under the heading "Common Stock 

Ownership of Certain Beneficial Owners and Management" and is incorporated herein by reference.

Item 13. Certain Relationships and Related Transactions, and Director Independence

The information required by Item 13 will be included in the 2019 Proxy Statement under the headings "Certain 

Relationships and Related Person Transactions" and "Director Independence" and is incorporated herein by reference.

Item 14. Principal Accountant Fees and Services

The information required by Item 14 will be included in the 2019 Proxy Statement under the heading "Proposal 2—

Ratification of the Selection of Deloitte & Touche LLP as Independent Registered Public Accounting Firm" and is incorporated 
herein by reference.

104

PART IV

Item 15. Exhibits, Financial Statement Schedules

(a) We have filed the following documents as part of this Annual Report on Form 10-K:

1. Consolidated Financial Statements

Report of Independent Registered Public Accounting Firm 
Consolidated Balance Sheets

Consolidated Statements of Operations
Consolidated Statements of Comprehensive Income (Loss) 
Consolidated Statements of Stockholders' Equity 
Consolidated Statements of Cash Flows

Notes to Consolidated Financial Statements

2. Financial Statement Schedules

70

72

73

74

75

76

77

No financial statement schedules are provided because the information called for is not required or is shown in the

financial statements of the notes thereto.

3. Exhibits

EXHIBIT INDEX

Number

Description

2.1

3.1

3.2

10.1+

10.2+

10.3+

10.4+

10.5+

10.6+

10.7+

Agreement and Plan at Merger, dated July 11, 2017, by and among the Registrant, Caviar 
Acquisition Corp., nToggle, Inc., Shareholder Representative Services LLC, solely in its capacity 
as the initial Holder Representative thereunder, and certain persons delivering joinder agreements 
therewith (incorporated by reference to Exhibit 2.1 to the Registrant's Current Report on Form 8-
K filed with the Commission on July 17, 2017).†

Sixth Amended and Restated Certificate of Incorporation of the Registrant (incorporated by 
reference to Exhibit 3.1 to the Registrant's Quarterly Report on Form 10-Q filed with the 
Commission on May 15, 2014).

Amended and Restated Bylaws of the Registrant (incorporated by reference to Exhibit 3.1 to the 
Registrant's Current Report on Form 8-K filed with the Commission on April 8, 2016).

The Rubicon Project, Inc. 2007 Stock Incentive Plan and forms of agreements for employees 
thereunder (incorporated by reference to Exhibit 10.1 to the Registrant's Registration Statement on 
Form S-1/A filed with the Commission on March 20, 2014).

The Rubicon Project, Inc. 2014 Equity Incentive Plan, as amended and restated (incorporated by 
reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K filed with the 
Commission on April 8, 2016).

Form of Stock Option Grant Notice and Award Agreement for Employees under The Rubicon 
Project, Inc. 2014 Equity Incentive Plan (incorporated by reference to Exhibit 10.2(B) to the 
Registrant's Annual Report on Form 10-K filed with the Commission on March 6, 2015).

Form of Restricted Stock Unit Grant Notice and Award Agreement for Employees under The 
Rubicon Project, Inc. 2014 Equity Incentive Plan (incorporated by reference to Exhibit 10.2(C) to 
the Registrant's Annual Report on Form 10-K filed with the Commission on March 6, 2015).

Form of Stock Option Grant Notice and Award Agreement for Non-Employee Directors under The 
Rubicon Project, Inc. 2014 Equity Incentive Plan (incorporated by reference to Exhibit 10.2(D) to 
the Registrant's Annual Report on Form 10-K filed with the Commission on March 6, 2015).
Form of Restricted Stock Unit Grant Notice and Award Agreement for Non-Employee Directors 
under The Rubicon Project, Inc. 2014 Equity Incentive Plan (incorporated by reference to Exhibit 
10.2(E) to the Registrant's Annual Report on Form 10-K filed with the Commission on March 6, 
2015).

Form Market Stock Award Notice and Award Agreement under The Rubicon Project, Inc. 2014 
Equity Incentive Plan (incorporated by reference to Exhibit 10.7 to the Registrant’s Annual Report 
on Form 10-K filed with the Commission on March 4, 2016).

105

10.8+

10.9+

10.10+

10.11+

10.12+

10.13+

10.14+

10.15+

10.16+

10.17

10.18

10.19

10.20

10.21

10.22+

10.23+

10.24+

10.25+

The Rubicon Project, Inc. 2014 Employee Stock Purchase Plan, as amended and restated on July 
26, 2018 (incorporated by reference to Exhibit 10.3 to the Registrant's Quarterly Report on Form
10-Q filed with the Commission on November 7, 2018).
Form of Enrollment Agreement under The Rubicon Project, Inc. 2014 Employee Stock Purchase 
Plan (incorporated by reference to Exhibit 10.3(B) to the Registrant's Annual Report on Form 10-
K filed with the Commission on March 6, 2015).

The Rubicon Project, Inc. 2014 Inducement Grant Equity Incentive Plan, as amended and restated 
(incorporated by reference to Exhibit 10.2 to the Registrant's Current Report on Form 8-K filed 
with the Commission on April 8, 2016).

Form of Restricted Stock Unit Grant Notice under The Rubicon Project, Inc. 2014 Inducement 
Grant Equity Incentive Plan (incorporated by reference to Exhibit 4.7 to the Registrant's 
Registration Statement on Form S-8 filed with the Commission on December 19, 2014).

Form of Stock Option Grant Notice under The Rubicon Project, Inc. 2014 Inducement Grant 
Equity Incentive Plan (incorporated by reference to Exhibit 4.8 to the Registrant's Registration 
Statement on Form S-8 filed with the Commission on December 19, 2014).

Form of Restricted Stock Grant Notice under The Rubicon Project, Inc. 2014 Inducement Grant 
Equity Incentive Plan (incorporated by reference to Exhibit 4.9 to the Registrant's Registration
Statement on Form S-8 filed with the Commission on December 19, 2014).

105

The Rubicon Project, Inc. 2015 Executive Cash Incentive Plan (incorporated by reference to 
Exhibit A to the Registrant's Definitive Proxy Statement on Schedule 14A filed with the 
Commission on April 2, 2015).

Executive Employment Agreement, dated May 4, 2007, between adMonitor, Inc. and Frank 
Addante, as amended December 14, 2007 (incorporated by reference to Exhibit 10.4 to the 
Registrant's Registration Statement on Form S-1 filed with the Commission on February 4, 2014).
Agreement, dated August 16, 2017, by and between Frank Addante and the Registrant 
(incorporated by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K filed 
with the Commission on August 22, 2017).

Amended and Restated Loan and Security Agreement, dated as of September 26, 2018, by and 
among Silicon Valley Bank, the Registrant, Rubicon Project Hopper, Inc., and Rubicon Project 
Bell,  Inc.  (incorporated  by  reference  to  Exhibit  10.1  to  the  Registrant's  Quarterly  Report  on 
Form10-Q filed with the Commission on November 8, 2018). 
Stock Pledge Agreement, dated October 3, 2013, by and between Silicon Valley Bank and the 
Registrant (incorporated by reference to Exhibit 10.15 to the Registrant's Registration Statement 
on Form S-1 filed with the Commission on February 4, 2014).

First Amendment to Stock Pledge Agreement, dated July 29, 2015, by and between Silicon Valley 
Bank and the Registrant (incorporated by reference to Exhibit 10.3 to the Registrant's Quarterly 
Report on Form 10-Q filed with the Commission on August 5, 2015).

Stock Pledge Agreement, dated as of July 29, 2015, by and between Silicon Valley Bank and 
Rubicon Project Unlatch, Inc. (incorporated by reference to Exhibit 10.4 to the Registrant's 
Quarterly Report on Form 10-Q filed with the Commission on August 5, 2015).

Second Amendment to Stock Pledge Agreement, dated as of September 26, 2018, by and between 
Silicon Valley Bank and the Registrant (incorporated by reference to Exhibit 10.2 to the 
Registrant's Quarterly Report on Form 10-Q filed with the Commission on November 8, 2018.

Form of Indemnification Agreement between the Registrant and each of its directors and 
executive officers (incorporated by reference to Exhibit 10.17 to the Registrant's Registration 
Statement on Form S-1/A filed with the Commission on March 20, 2014).

Form  of  Executive  Severance  and  Vesting  Acceleration  Agreement  by  and  between  the 
Registrant and certain of its executive officers (incorporated by reference to Exhibit 10.18 to the 
Registrant's  Registration  Statement  on  Form  S-1  filed  with  the  Commission  on  February  4, 
2014).

Form of Amendment No. 1 to Executive Severance and Vesting Acceleration Agreement by and 
between the Registrant and certain of its executive officers (incorporated by reference to Exhibit 
10.1 to the Registrant Quarterly Report on Form 10-Q filed with the Commission on August 5, 
2015).

Executive Employment Agreement between the Registrant and Michael Barrett, dated March 16, 
2017 (incorporated by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K 
filed with the Commission on March 22, 2017).

106

10.26+

10.27

16.1

21.1*

23.1*

23.2*

31.1*

31.2*

32*(1)

101.ins *

101.sch *

101.cal *

101.def *

101.lab *

101.pre *

Executive Severance and Vesting Acceleration Agreement between the Registrant and Michael 
Barrett, dated March 16, 2017 (incorporated by reference to Exhibit 10.2 to the Registrant's 
Current Report on Form 8-K filed with the Commission on March 22, 2017).

Sublease, dated January 9, 2013, by and between Fox Interactive Media, Inc. and the Registrant 
(incorporated by reference to Exhibit 10.19 to the Company's Registration Statement on Form S-1 
filed with the Commission on February 4, 2014).

Letter of PricewaterhouseCoopers LLP dated August 23, 2018 to the SEC regarding statements 
included in Current Report on Form 8-K (incorporated by reference to Exhibit 16.1 to the 
Registrant's Current Report on Form 8-K filed with the Commission on August 23, 2018).

List of Subsidiaries of The Rubicon Project, Inc.

Consent of Deloitte & Touche LLP.

Consent of PricewaterhouseCoopers LLP.

Certification of Principal Executive Officer Pursuant to Exchange Act Rules 13a-14(a) and 
15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Certification of Principal Financial Officer Pursuant to Exchange Act Rules 13a-14(a) and 
15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Certification of the Principal Executive Officer and Principal Financial Officer Pursuant to 18 
U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
XBRL Instance Document- the instance document does not appear in the Interactive Data File 
because its XBRL tags are embedded within the Inline XBRL document.

XBRL Taxonomy Schema Linkbase Document

XBRL Taxonomy Calculation Linkbase Document

XBRL Taxonomy Definition Linkbase Document

XBRL Taxonomy Label Linkbase Document

XBRL Taxonomy Presentation Linkbase Document

*
+
† 

(1) 

Filed herewith
Indicates a management contract or compensatory plan or arrangement
Certain schedules have been omitted pursuant to Item 601(b)(2) of Regulation S-K. The Company agrees to furnish 
supplemental copies of any of the omitted schedules upon request by the Securities and Exchange Commission.

The information in this exhibit is furnished and deemed not filed with the Securities and Exchange Commission for
purposes of section 18 of the Exchange Act of 1934, as amended (the "Exchange Act"), and is not to be incorporated by
reference into any filing of The Rubicon Project, Inc. under the Securities Act of 1933, as amended (the "Securities Act"),
or the Exchange Act, whether made before or after the date hereof, regardless of any general incorporation language in
such filing.

Item 16. Form 10-K Summary

None.

107

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly 

caused this Annual Report on Form 10-K to be signed on its behalf by the undersigned, thereunto duly authorized.

SIGNATURES

THE RUBICON PROJECT, INC.
(Registrant)

/s/  David Day
David Day

Chief Financial Officer
(Principal Financial Officer)

Date February 27, 2019

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following 

persons on behalf of the registrant and in the capacities and on the dates indicated:

Name
/s/ Michael Barrett

Michael Barrett

/s/ David Day
David Day

/s/ Blima Tuller
Blima Tuller

/s/  Frank Addante
Frank Addante

/s/  Robert J. Frankenberg
Robert J. Frankenberg

/s/  Sumant Mandal
Sumant Mandal

/s/  Robert F. Spillane
Robert F. Spillane

/s/  Lisa L. Troe
Lisa L. Troe

/s/  Lewis W. Coleman
Lewis W. Coleman

Date

February 27, 2019

February 27, 2019

February 27, 2019

February 27, 2019

February 27, 2019

February 27, 2019

February 27, 2019

February 27, 2019

February 27, 2019

Title

President, Chief Executive Officer and Director
(Principal Executive Officer)

Chief Financial Officer
(Principal Financial Officer )

Chief Accounting Officer
(Principal Accounting Officer)

Director

Director

Director

Director

Director

Director

108

Board of Directors

Corporate Headquarters

12181 Bluff Creek Drive, 
4th Floor
Playa Vista, CA 90094

Independent Registered   
Public Accounting Firm

Deloitte & Touch LLP
555 West 5th Street
Suite 2700
Los Angeles, CA 90013

Transfer Agent

American Stock Transfer  
& Trust Company, LLC
6201 15h Avenue
Brooklyn, NY 11219
astfinancial.com

Investor Relations

Nick Kormeluk
12181 Bluff Creek Drive
4th Floor
Playa Vista, CA 90094
(949) 500-0003
nkormeluk@rubiconproject.com

Michael G. Barrett
President and Chief Executive Officer

Frank Addante
Chairman of the Board

Lewis W. Coleman
Retired Vice Chairman,  
DreamWorks Animation

Robert J. Frankenberg
Owner, NetVentures

Sumant Mandal
Managing Director,  
March Capital Partners

Robert F. Spillane
Former Managing Principal  
at DigaComm, L.L.C.

Lisa L. Troe
Senior Managing Director and  
co-founder, Athena Advisors LLC

Executive Officers

Michael G. Barrett 
President and Chief Executive Officer

David L. Day
Chief Financial Officer

Jonathan Feldman
Co-General Counsel and Secretary

Eve Filip
Co-General Counsel and  
Data Protection Officer

Thomas Kershaw
Chief Technology Officer

Joseph Prusz
Chief Revenue Officer

Adam Soroca
Head of Global Buyer Team

Blima Tuller
Chief Accounting Officer

THE GLOBAL EXCHANGE
FOR ADVERTISING