This Quarterly Report on Form 10-Q contains forward-looking statements within
the meaning of Section 27A of the Securities Act of 1933, as amended, and
Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking
statements generally relate to future events or our future financial or
operating performance and may include statements concerning, among other things,
our business strategy (including anticipated trends and developments in, and
management plans for, our business and the markets in which we operate),
financial results, the impact of COVID-19 on our business, operations, and the
markets and communities in which we, our clients, and partners operate, results
of operations, revenues, operating expenses, and capital expenditures, sales and
marketing initiatives and competition. In some cases, you can identify
forward-looking statements because they contain words such as "may," "might,"
"will," "should," "expects," "plans," "anticipates," "could," "intends,"
"target," "projects," "contemplates," "believes," "estimates," "predicts,"
"suggests," "potential" or "continue" or the negative of these words or other
similar terms or expressions that concern our expectations, strategy, plans or
intentions. These statements are not guarantees of future performance; they
reflect our current views with respect to future events and are based on
assumptions and are 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.

We discuss many of these risks in Part II of this Quarterly Report on Form 10-Q
in greater detail under the heading "Risk Factors" and in other filings we make
from time to time with the Securities and Exchange Commission, or SEC. Also,
these forward-looking statements represent our estimates and assumptions only as
of the date of this Quarterly Report on Form 10-Q, which are inherently subject
to change and involve risks and uncertainties. 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. Given these uncertainties, investors should not place undue
reliance on these forward-looking statements.

Investors should read this Quarterly Report on Form 10-Q and the documents that
we reference in this report and have filed with the SEC, including our Annual
Report on Form 10-K for the year ended December 31, 2020, 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.

References to "Notes" are notes included in our unaudited condensed consolidated financial statements appearing elsewhere in this Quarterly Report on Form 10-Q.

Overview



We are a technology company that empowers buyers of advertising. Through our
self-service, cloud-based platform, ad buyers can create, manage, and optimize
more expressive data-driven digital advertising campaigns across ad formats and
channels, including display, video, audio, native and social, on a multitude of
devices, such as computers, mobile devices, and connected TV ("CTV"). Our
platform's integrations with major inventory, publisher, and data partners
provides ad buyers reach and decisioning capabilities, and our enterprise
application programming interfaces ("APIs") enable our clients to develop on top
of the platform.

We commercially launched our platform in 2011, targeting the display advertising channel. Since launching, we have added additional advertising channels. In 2020, the gross spend on our platform came from multiple channels including mobile, video (which includes CTV), display, audio, native and social channels.



Our clients are primarily the advertising agencies and other service providers
for advertisers, with whom we enter into ongoing master services agreements
("MSAs"). We generate revenue by charging our clients a platform fee based on a
percentage of a client's total spend on advertising. We also generate revenue
from providing data and other value-added services and platform features.

Executive Summary

Highlights

For the three months ended March 31, 2021 and 2020:

• revenue was $219.8 million and $160.7 million, respectively, representing


        an increase of 37%; and


  • net income was $22.6 million and $24.1 million, respectively.




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Trends, Opportunities and Challenges



The growing digitization of media and fragmentation of audiences has increased
the complexity of advertising, and thereby increased the need for automation in
ad buying, which we provide on our platform. In order to grow, we will need to
continue to develop our platform's programmatic capabilities and advertising
inventory. We believe that key opportunities include our ongoing global
expansion, continuing development of our CTV, video, audio, and native ad
inventory, and continuing development of data usage and advertising targeting
capabilities.

We believe that growth of the programmatic advertising market is important for
our ability to grow our business. Adoption of programmatic advertising by
advertisers allows us to acquire new clients and grow revenue from existing
clients. Although our clients include some of the largest advertising agencies
in the world, we believe there is significant room for us to expand further
within these clients and gain a larger amount of their advertising spend through
our platform. We also believe that the industry trends noted above will lead to
advertisers adopting programmatic advertising through platforms such as ours.

Similarly, the adoption of programmatic advertising by inventory owners and content providers allows us to expand the volume and type of advertising inventory that we present to our clients. For example, we have expanded our CTV, native and audio advertising offerings through our recent integrations with supply-side partners.



We invest for long-term growth. We anticipate that our operating expenses will
continue to increase significantly in the foreseeable future as we invest in
platform operations and technology and development to enhance our product
features, including programmatic buying of CTV ad inventory, and in sales and
marketing to acquire new clients and reinforce our relationships with existing
clients. In addition, we expect to continue making investments in our
infrastructure, including our information technology, financial and
administrative systems and controls, to support our growing operations.

We believe the markets outside of the United States, and in particular China,
offer an opportunity for growth, although such markets also may pose challenges
related to compliance with local laws and regulations, restrictions on foreign
ownership or investment, uncertainty related to trade relations, and a variety
of additional risks. We intend to make additional investments in sales and
marketing and product development to expand in these markets, including China,
where we are making significant investments in our platform and growing our
team.

We believe that these investments will contribute to our long-term growth, although they may negatively impact profitability in the near term.

Our business model has allowed us to grow significantly, and we believe that our operating leverage enables us to support future growth profitably.

COVID-19



The worldwide spread of the COVID-19 pandemic has resulted, and is expected to
continue to result, in a global slowdown of economic activity which is likely to
decrease demand for a broad variety of goods and services, including those
provided by our clients, while also disrupting sales channels and advertising
and marketing activities for an unknown period of time until the COVID-19
pandemic is contained, or economic activity normalizes. With the current decline
in economic activity, the impact on our revenue and our results of operations is
likely to continue, the size and duration of which we are currently unable to
accurately predict. The extent of the impact of the COVID-19 pandemic on our
operational and financial performance will depend on a variety of factors,
including the duration and spread of the COVID-19 pandemic and its impact on our
clients, partners, industry, and employees, all of which are uncertain at this
time and cannot be accurately predicted. See "Risk Factors" for further
discussion of the adverse impacts of the COVID-19 pandemic on our business.

                                       14

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Results of Operations

The following tables set forth our condensed consolidated statements of comprehensive income data for each of the periods presented and as a percentage of our revenue for those periods:





                                      Three Months Ended
                                           March 31,
                                      2021          2020
                                        (in thousands)
Revenue                             $ 219,811     $ 160,660
Operating expenses:
Platform operations                    50,500        40,208
Sales and marketing                    55,764        34,294
Technology and development             53,918        36,794
General and administrative             51,845        38,598
Total operating expenses              212,027       149,894
Income from operations                  7,784        10,766
Total other expense (income), net        (308 )         417
Income before income taxes              8,092        10,349
Benefit from income taxes             (14,550 )     (13,708 )
Net income                          $  22,642     $  24,057





                                            Three Months Ended
                                                March 31,
                                         2021                 2020
                                     (as a percentage of revenue*)
Revenue                                        100 %              100 %
Operating expenses:
Platform operations                             23                 25
Sales and marketing                             25                 21
Technology and development                      25                 23
General and administrative                      24                 24
Total operating expenses                        96                 93
Income from operations                           4                  7
Total other expense (income), net                -                  -
Income before income taxes                       3                  6
Benefit from income taxes                       (7 )               (9 )
Net income                                      10 %               15 %




  * Percentages may not sum due to rounding.


Revenue



                                                                Change
                                 2021          2020           $          %
                                             ($ in thousands)
Three months ended March 31,   $ 219,811     $ 160,660     $ 59,151       37 %




The increase in revenue for the three months ended March 31, 2021, compared to
the same prior year period, was primarily due to increases in gross spend on our
platform by existing clients, which was driven by increases in the number of
advertising campaigns executed per client, and reduction in advertising spend in
the latter part of the three months ended March 31, 2020 due to the impact of
the COVID-19 pandemic.

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Platform Operations



                                                              Change
                                 2021         2020          $          %
                                            ($ in thousands)
Three months ended March 31,   $ 50,500     $ 40,208     $ 10,292       26 %
Percent of revenue                   23 %         25 %




The increase in platform operations expense for the three months ended March 31,
2021, compared to the same prior year period, was primarily due to increases of
$4.7 million in personnel costs, $3.1 million in hosting costs and $2.7 million
in facilities costs and allocated overhead. The increase in personnel costs was
primarily driven by stock-based compensation costs of $3.6 million due to our
hiring, growth and an increase in ESPP stock-based compensation expense and
increases in payroll related costs of $1.1 million. The increase in hosting
costs was primarily attributable to supporting the increased use of our platform
by our clients. The increase in facilities costs was primarily driven by new
data center locations and leases for additional office space to support our
future growth.

We expect platform operations expenses to increase in absolute dollars in future periods as we continue to experience increased volumes of media impressions through our platform and hire additional personnel to support our clients.



Sales and Marketing



                                                              Change
                                 2021         2020          $          %
                                            ($ in thousands)

Three months ended March 31, $ 55,764 $ 34,294 $ 21,470 63 % Percent of revenue

                   25 %         21 %




The increase in sales and marketing expense for the three months ended March 31,
2021, compared to the same prior year period, was primarily due to increases of
$18.9 million in personnel costs, including $8.4 million of stock-based
compensation, and $2.3 million in allocated facilities costs. The increase in
personnel costs was primarily due to an increase in headcount in order to
support our sales efforts and continue to develop and maintain relationships
with our clients. The increase in stock-based compensation was primarily due to
an increase in ESPP stock-based compensation expense. The increase in allocated
facilities costs was primarily driven by new leases for additional office space
to support our future growth.

We expect sales and marketing expenses to increase in absolute dollars in future
periods, as we focus on increasing the adoption of our platform with existing
and new clients and expanding our international business.

Technology and Development



                                                              Change
                                 2021         2020          $          %
                                            ($ in thousands)

Three months ended March 31, $ 53,918 $ 36,794 $ 17,124 47 % Percent of revenue

                   25 %         23 %




The increase in technology and development expense for the three months ended
March 31, 2021, compared to the same prior year period, was primarily due to
increases of $14.7 million in personnel costs, including $7.5 million of
stock-based compensation and $2.5 million in allocated facilities costs. The
increase in personnel costs was primarily attributable to increased headcount to
maintain and support further development of our platform. The increase in
stock-based compensation was primarily due to an increase in ESPP stock-based
compensation expense. The increase in allocated facilities costs was primarily
driven by new leases for additional office space to support our growth.

We expect technology and development expense to increase in absolute dollars as
we continue to invest in the development of our platform to support additional
features and functions, increase the number of advertising and data inventory
suppliers and support the increase in volume of advertising spending by our
customers on our platform. We also intend to invest in technology to further
automate our business processes.

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General and Administrative



                                                              Change
                                 2021         2020          $          %
                                            ($ in thousands)
Three months ended March 31,   $ 51,845     $ 38,598     $ 13,247       34 %
Percent of revenue                   24 %         24 %




The increase in general and administrative expense for the three months ended
March 31, 2021, compared to the same prior year period, was primarily due to
increases of $10.9 million in personnel costs, $3.1 million in professional
service fees and $1.6 million in allocated facilities costs. These increases
were partially offset by a $2.4 million decrease in credit loss expense due to
recoveries and less specific bad debt identified in the current quarter. The
increase in personnel costs was primarily driven by increases in stock-based
compensation costs of $10.0 million due to our hiring and growth and an increase
in ESPP stock-based compensation expense and payroll related costs of $4.0
million, partially offset by a decrease of $3.0 million in reduced
employee-related corporate events and travel due to the COVID-19 pandemic. The
increase in allocated facilities costs was primarily driven by new leases for
additional office space to support our future growth.

We expect general and administrative expenses to increase in absolute dollars in
future periods. We expect to continue to invest in corporate infrastructure to
support growth.

Total Other Expense (Income), Net





                                2021      2020       $ Change
                                       (in thousands)

Three months ended March 31, $ (308 ) $ 417 $ (725 )






The decrease in total other expense (income), net for the three months ended
March 31, 2021, compared to the same prior year period, was primarily due to the
decrease in foreign exchange loss of $1.6 million, the decrease in net interest
income of $1.1 million and a decrease in investment credit loss of $0.3 million.
Compared to the same prior year period, the decrease in net interest income was
attributable to lower interest rates on our short-term investments and the zero
outstanding debt balance on our credit facility. The decrease in foreign
exchange loss was due to realized gains during the current period. The decrease
in investment credit loss was due to recovered unrealized credit loss.



Benefit from Income Taxes



                                 2021           2020
                                   ($ in thousands)

Three months ended March 31, $ (14,550 ) $ (13,708 ) Effective tax rate

                  (180 )%        (132 )%




The U.S. federal statutory tax rate was 21% for the 2021 and 2020 periods, respectively.



The increase in the income tax benefit for the three months ended March 31, 2021
compared to the prior year period, was primarily due to an increase in the tax
benefits associated with employee exercises of stock options and vesting of
restricted stock units. For the three months ended March 31, 2021 and 2020, the
tax benefits associated with employee exercises of stock options and vesting of
restricted stock units were $25.9 million and $24.3 million, respectively.

Liquidity and Capital Resources

As of March 31, 2021, we had cash and cash equivalents of $471.6 million, including cash of $47.6 million held by our international subsidiaries, short-term investments in marketable securities of $208.4 million, and working capital of $906.7 million.



We believe our existing cash and cash equivalents and cash flow from operations
will be sufficient to meet our working capital requirements for at least the
next 12 months. Further, in November 2020, we filed a shelf registration
statement on Form S-3 with the SEC, or the Shelf Registration, which permits us
to issue equity securities and equity-linked securities from time to time,
subject to certain limitations. The Shelf Registration is intended to provide us
with additional flexibility to access capital markets for general corporate
purposes, subject to market conditions and our capital needs. Our future capital
requirements and the adequacy of available funds will depend on many factors,
including those set forth under "Risk Factors" within this Quarterly Report on
Form 10-Q.

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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 the incurrence of additional indebtedness, we may be subject to
increased fixed payment obligations and could also be subject to additional
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.

There can be no assurances that we will be able to raise additional capital. The
inability to raise capital would adversely affect our ability to achieve our
business objectives. In addition, if our operating performance during the next
12 months is below our expectations, our liquidity and ability to operate our
business could be adversely affected. In light of the recent worldwide COVID-19
pandemic we are closely monitoring the effect that current economic conditions
may have on our working capital requirements.

Credit Facility



On October 26, 2018, we and a syndicate of banks, led by Citibank, N.A., as
agent, entered into the Second Amended and Restated Loan and Security Agreement
("our credit facility"). Available funding commitments to us under our credit
facility, subject to certain conditions, total up to $150.0 million, with a
$20.0 million sublimit for swingline borrowings and a $15.0 million sublimit for
the issuance of letters of credit. Under certain circumstances, we have the
right to increase our credit facility by an amount not to exceed $100.0 million.
In March 2020, we drew down $143.0 million under our credit facility as a
precautionary measure to provide increased liquidity and preserve financial
flexibility in light of the worldwide decline in business activity resulting
from the COVID-19 pandemic. In October 2020, we repaid the balance on our credit
facility from available working capital. As of March 31, 2021, availability
under our credit facility was $143.6 million. Our credit facility matures on May
9, 2022.

Cash Flows

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





                                                           Three Months Ended March 31,
                                                             2021                 2020
                                                                  (in thousands)
Net cash provided by operating activities               $       75,070       $       52,776
Net cash used in investing activities                   $      (36,327 )     $      (16,026 )
Net cash provided by (used in) financing activities     $       (4,459 )     $      157,585




Operating Activities

Our cash flows from operating activities are primarily influenced by growth in
our operations, increases or decreases in collections from our clients, and
related payments to our suppliers for advertising inventory and data. We
typically pay suppliers in advance of collections from our clients. Our
collection and payment cycles can vary from period to period. In addition, we
expect seasonality to impact cash flows from operating activities on a
sequential quarterly basis during the year.

For the three months ended March 31, 2021, cash provided by operating activities
of $75.1 million resulted primarily from net income adjusted for non-cash items
of $99.6 million and a net decrease in our operating assets and liabilities of
$24.5 million. The net decrease in working capital was primarily due to a $208.8
million decrease in accounts receivables, partially offset by a $200.6 million
decrease in accounts payable and a $16.2 million increase in prepaid expenses
and other assets. The decrease in accounts receivable resulted from the decrease
in spend through our platform due to seasonality and the timing of cash receipts
from clients. The decrease in accounts payable was due to the decrease in spend
through our platform due to seasonality and the timing of payments to suppliers
for the cost of advertising inventory, data and add-on features. The increase in
prepaid expenses and other assets was attributable to an increase in the income
tax receivable primarily related to the tax benefits associated with employee
exercises of stock options and vesting of restricted stock units.

For the three months ended March 31, 2020, cash provided by operating activities
of $52.8 million resulted primarily from net income adjusted for non-cash items
of $65.7 million, partially offset by a net decrease in our operating assets and
liabilities of $12.9 million. The net decrease in working capital was primarily
due to a decrease of $206.0 million in accounts payable and a $15.8 million
increase in prepaid expenses and other assets, partially offset by $210.6
million decrease in accounts receivables. The decrease in accounts payable was
due to the decrease in spend through our platform, seasonality and the timing of
payments to suppliers for the cost of advertising inventory, data, and add-on
features. The decrease in accounts receivable resulted from the decrease in
spend through our platform, seasonality and the timing of cash receipts from
clients. The increase in prepaid expenses and other assets was attributable to
an increase in the income tax receivable primarily related to the tax benefits
associated with employee exercises of stock options and vesting of restricted
stock units.

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Investing Activities



Our primary investing activities consist of investing in short-term investments
in marketable securities, purchases of property and equipment for the expansion
of our new facilities in support of our expanding headcount as a result of our
growth, and capital expenditures to develop our software in support of enhancing
our technology platform. As our business grows, we expect our capital
expenditures and our investment activity to continue to increase.

For the three months ended March 31, 2021, we used $36.3 million of cash in investing activities, consisting of $89.4 million to purchase short-term investments, $13.1 million to purchase property and equipment, and $1.1 million of investments in capitalized software, partially offset by maturities of short-term investments of $62.7 million and sales of investments of $4.5 million. Purchases of property and equipment and investments in capitalized software support our growth and further development of our platform.



For the three months ended March 31, 2020, we used $16.0 million of cash in
investing activities, consisting of $35.9 million to purchase short-term
investments, $18.3 million to purchase property and equipment, and $1.0 million
of investments in capitalized software, partially offset by maturities of
short-term investments of $39.2 million. Purchases of property and equipment and
investments in capitalized software support our growth and further development
of our platform.

Financing Activities

For the three months ended March 31, 2021, cash used by financing activities of
$4.5 million was primarily due to $17.1 million of taxes paid for restricted
stock award settlements, partially offset by $12.6 million proceeds from stock
option exercises.

For the three months ended March 31, 2020, cash provided by financing activities of $157.6 million was primarily due to the $143.0 million proceeds from our credit facility and $19.5 million proceeds from stock option exercises, partially offset by $4.9 million of taxes paid for restricted stock award settlements.

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 March 31, 2021 other than the
indemnification agreements described below.

Contractual Obligations



Our principal commitments consist of our non-cancelable operating leases for our
various office facilities and other contractual commitments consisting of
obligations to our hosting services providers, marketing contracts and providers
of software as a service. In certain cases, the terms of the lease agreements
provide for rental payments on a graduated basis.

The following table summarizes our non-cancelable contractual obligations at
March 31, 2021:



                                                                            Payments Due by Period
                                                                                                             More than
                                         Less than 1 Year          1-3 Years             3-5 Years            5 Years
                                         (Remaining 2021)       (2022 and 2023)       (2024 and 2025)       (Thereafter)        Total

Operating lease commitments             $           32,767     $          

99,255 $ 79,691 $ 131,372 $ 343,085 Other contractual commitments

                       50,074                67,211                16,785                  -       134,070
Total                                   $           82,841     $         166,466     $          96,476     $      131,372     $ 477,155


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In the ordinary course of business, we enter into agreements in which we may
agree to indemnify clients, suppliers, vendors, lessors, business partners,
lenders, stockholders, and other parties with respect to certain matters,
including 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 other
officers that will require us to indemnify them against liabilities that may
arise by reason of their status or service as directors, officers or employees.
In the ordinary course of business, demands have been made upon us to provide
indemnification under such agreements, but we are not aware of any claims that
could have a material effect on our balance sheet, statement of income or
statement of cash flows. Accordingly, no amounts for any obligation have been
recorded at March 31, 2021.


Critical Accounting Policies and Estimates



Our condensed consolidated financial statements are prepared in accordance with
GAAP. The preparation of these condensed 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 assumptions and estimates associated with the evaluation of
revenue recognition criteria, including the determination of revenue recognition
as net versus gross in our revenue arrangements, stock-based compensation
expense and income taxes have the greatest potential impact on our consolidated
financial statements. Therefore, we consider these to be our critical accounting
policies and estimates. By their nature, estimates are subject to an inherent
degree of uncertainty. Actual results could differ materially from these
estimates.

Recently Issued Accounting Pronouncements

Refer to Note 2- Basis of Presentation and Summary of Significant Accounting Policies of our condensed consolidated financial statements.

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