Filed Pursuant to Rule 424(b)(3)
Registration No. 333-262201

PROSPECTUS

AdTheorent Holding Company, Inc.

Up to 76,713,193 Shares of Common Stock

Up to 15,973,904 Shares of Common Stock Issuable Upon the Exercise of Warrants

Up to 5,432,237 Warrants

This prospectus relates to the issuance by us of up to an aggregate of 15,973,904 shares of our common stock, $0.0001 par value per share (“Common Stock”), which consists of (i) up to 10,541,667 shares of Common Stock issuable upon the exercise of 10,541,667 warrants (the “Public Warrants”) originally issued in the initial public offering of MCAP Acquisition Corporation, a Delaware corporation (“MCAP”), by the holders thereof, and (ii) up to 5,432,237 shares of Common Stock issuable upon the exercise of 5,432,237 warrants (the “Private Warrants” and, together with the Public Warrants, the “Warrants”) originally issued in a private placement in connection with the initial public offering of MCAP (551,096 of which are subject to escrow and forfeiture unless certain earn-out targets are achieved pursuant to the Business Combination Agreement (as defined below)). We will receive the proceeds from any exercise of the Warrants for cash.

This prospectus also relates to the offer and sale from time to time, upon the expiration of lock-up agreements, if applicable, by (a) the selling stockholders named in this prospectus (including their permitted transferees, donees, pledgees and other successors-in-interest) (collectively, the “Selling Stockholders”) of up to 76,713,193 shares of Common Stock, consisting of (i) up to 12,150,000 shares of Common Stock, issued in a private placement to the PIPE Investors (as defined below) pursuant to the terms of separate Subscription Agreements (as defined below) in connection with the Business Combination (as defined below), (ii) up to 5,432,237 shares of Common Stock that may be issued upon the exercise of the Private Warrants, (iii) up to 7,906,250 shares of Common Stock held by MCAP Acquisition, LLC (the “Sponsor”) and its affiliates, (iv) up to 13,935,678 shares of Common Stock held by or underlying equity awards held by affiliates of AdTheorent Holding Company, Inc. (“AdTheorent” or the “Company”), (v) up to 34,064,174 shares of Common Stock held by H.I.G. Growth—AdTheorent, LLC, and (vi) up to 3,224,854 additional shares of Common Stock held by entities affiliated with Monroe Capital, LLC and (b) the selling warrant holders named in this prospectus (including their permitted transferees, donees, pledgees and other successors-in-interest) (collectively, the “Selling Warrantholders” and, together with the Selling Stockholders, the “Selling Securityholders”) of up to 5,432,237 Private Warrants.

We are registering the securities for resale pursuant to the Selling Securityholders’ registration rights under certain agreements between us and the Selling Securityholders. Our registration of the securities covered by this prospectus does not mean that the Selling Securityholders will offer or sell any of the shares of Common Stock or Warrants registered hereby. The Selling Securityholders may offer, sell or distribute all or a portion of their shares of Common Stock or Warrants publicly or through private transactions at prevailing market prices or at negotiated prices. We provide more information about how the Selling Securityholders may sell the shares or Warrants in the section entitled “Plan of Distribution.”

We are an “emerging growth company” as defined in Section 2(a) of the Securities Act of 1933, as amended (the “Securities Act”), and are subject to reduced public company reporting requirements. This prospectus complies with the requirements that apply to an issuer that is an emerging growth company.

Our Common Stock and Public Warrants are listed on the Nasdaq Capital Market (the “NASDAQ”) under the symbols “ADTH” and “ADTHW,” respectively. On January 28, 2022, the closing price of our Common Stock was $4.37 per share and the closing price of our Public Warrants was $0.56 per Warrant.

See the section entitled “Risk Factors” beginning on page 6 of this prospectus to read about factors you should consider before buying our securities.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus is January 31, 2022

TABLE OF CONTENTS

You should rely only on the information provided in this prospectus, as well as the information incorporated by reference into this prospectus and any applicable prospectus supplement. Neither we nor the Selling Securityholders have authorized anyone to provide you with different information. Neither we nor the Selling Securityholders are making an offer of these securities in any jurisdiction where the offer is not permitted. You should not assume that the information in this prospectus or any applicable prospectus supplement is accurate as of any date other than the date of the applicable document. Since the date of this prospectus and the documents incorporated by reference into this prospectus, our business, financial condition, results of operations and prospects may have changed.

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ABOUT THIS PROSPECTUS

This prospectus is part of a registration statement on Form S-1 that we filed with the Securities and Exchange Commission (the “SEC”) using the “shelf” registration process. Under this shelf registration process, the Selling Securityholders may, from time to time, sell the securities offered by them described in this prospectus. We will not receive any proceeds from the sale by such Selling Securityholders of the securities offered by them described in this prospectus. This prospectus also relates to the issuance by us of the shares of Common Stock issuable upon the exercise of the Warrants. We will not receive any proceeds from the sale of shares of Common Stock underlying the Warrants pursuant to this prospectus, except with respect to amounts received by us upon the exercise of the Warrants for cash.

Neither we nor the Selling Securityholders have authorized anyone to provide you with any information or to make any representations other than those contained in this prospectus or any applicable prospectus supplement or any free writing prospectuses prepared by or on behalf of us or to which we have referred you. Neither we nor the Selling Securityholders take responsibility for, and can provide no assurance as to the reliability of, any other information that others may give you. Neither we nor the Selling Securityholders will make an offer to sell these securities in any jurisdiction where the offer or sale is not permitted.

We may also provide a prospectus supplement or post-effective amendment to the registration statement to add information to, or update or change information contained in, this prospectus. You should read both this prospectus and any applicable prospectus supplement or post-effective amendment to the registration statement together with the additional information to which we refer you in the sections of this prospectus entitled “Where You Can Find More Information.”

On December 22, 2021 (the “Closing Date”), MCAP, now known as AdTheorent Holding Company, Inc., consummated the previously announced business combination pursuant to that certain Business Combination Agreement, dated as of July 27, 2021 (as amended, restated, supplemented or otherwise modified, the “Business Combination Agreement”), by and among MCAP, GRNT Merger Sub 1 LLC, a Delaware limited liability company (“Merger Sub 1”), GRNT Merger Sub 2 LLC, a Delaware limited liability company (“Merger Sub 2”), GRNT Merger Sub 3 LLC, a Delaware limited liability company (“Merger Sub 3”), GRNT Merger Sub 4 LLC, a Delaware limited liability company (“Merger Sub 4” and, together with Merger Sub 1, Merger Sub 2 and Merger Sub 3, the “Merger Sub Entities”), H.I.G. Growth—AdTheorent Intermediate, LLC, a Delaware limited liability company (the “Blocker”), H.I.G. Growth—AdTheorent, LLC, a Delaware limited liability company, and AdTheorent Holding Company, LLC, a Delaware limited liability company (“Legacy AdTheorent”). Pursuant to the terms of the Business Combination Agreement, Legacy AdTheorent, the Blocker and the Merger Sub Entities engaged in a series of four mergers, which resulted in Legacy AdTheorent becoming a wholly owned subsidiary of MCAP (the “Business Combination’). On the Closing Date, and in connection with the closing of the Business Combination (the “Closing”), MCAP changed its name to AdTheorent Holding Company, Inc.

Unless the context indicates otherwise, references in this prospectus to the “Company,” “AdTheorent,” “we,” “us,” “our” and similar terms refer to AdTheorent Holding Company, Inc. and its consolidated subsidiaries (including Legacy AdTheorent). References to “MCAP” refer to our predecessor company prior to the consummation of the Business Combination.

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CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

This prospectus contains forward-looking statements within the meaning of Section 27A of the Securities Act, and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). We have based these forward-looking statements on our current expectations and projections about future events. All statements, other than statements of present or historical fact included in this prospectus, our future financial performance, strategy, expansion plans, future operations, future operating results, estimated revenues, losses, projected costs, prospects, plans and objectives of management are forward-looking statements. Any statements that refer to projections, forecasts or other characterizations of future events or circumstances, including any underlying assumptions, are forward-looking statements. In some cases, you can identify forward-looking statements by terminology such as “may,” “should,” “could,” “would,” “expect,” “plan,” “anticipate,” “intend,” “believe,” “estimate,” “continue,” “goal,” “outlook,” “forecast,” “possible,” “potential,” “predict,” “project” or the negative of such terms or other similar expressions. These forward-looking statements are subject to known and unknown risks, uncertainties and assumptions about us that may cause our actual results, levels of activity, performance or achievements to be materially different from any future results, levels of activity, performance or achievements expressed or implied by such forward-looking statements. Except as otherwise required by applicable law, we disclaim any duty to update any forward-looking statements, all of which are expressly qualified by the statements in this section, to reflect events or circumstances after the date of this prospectus. We caution you that these forward-looking statements are subject to numerous risks and uncertainties, most of which are difficult to predict and many of which are beyond our control.

Forward-looking statements in this prospectus may include, for example, statements about:

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These statements are subject to known and unknown risks, uncertainties and assumptions that could cause actual results to differ materially from those projected or otherwise implied by the forward-looking statements, including the following:

Given these risks and uncertainties, you should not place undue reliance on these forward-looking statements. Additional cautionary statements or discussions of risks and uncertainties that could affect our results or the achievement of the expectations described in forward-looking statements may also be contained in any accompanying prospectus supplement.

Should one or more of the risks or uncertainties described in this prospectus, or should underlying assumptions prove incorrect, actual results and plans could differ materially from those expressed in any forward-looking statements. Additional information concerning these and other factors that may impact the operations and projections discussed herein can be found in the section entitled “Risk Factors” and in our periodic filings with the SEC. Our SEC filings are available publicly on the SEC’s website at www.sec.gov.

You should read this prospectus and any accompanying prospectus supplement completely and with the understanding that our actual future results, levels of activity and performance as well as other events and circumstances may be materially different from what we expect. We qualify all of our forward-looking statements by these cautionary statements.

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RISK FACTORS

Investing in our securities involves risks. Before you make a decision to buy our securities, in addition to the risks and uncertainties discussed above under “Cautionary Note Regarding Forward-Looking Statements” and “Summary Risk Factors,” you should carefully consider the specific risks set forth herein. If any of these risks actually occur, our business, financial condition, liquidity, results of operations and prospects could be materially and adversely affected. As a result, the market price of our securities could decline, and you could lose all or part of your investment. Additionally, the risks and uncertainties described in this prospectus or any prospectus supplement are not the only risks and uncertainties that we face. Additional risks and uncertainties not presently known to us or that we currently believe to be immaterial may become material and adversely affect our business, financial condition, liquidity, results of operations and prospects.

RISKS RELATED TO OUR BUSINESS AND INDUSTRY

Our success and revenue growth is dependent on our marketing efforts, ability to maintain our brand, adding new customers, effectively educating and training our existing customers on how to make full use of our platform and services and increasing usage of our platform and services by our customers.

Our success is dependent on regularly adding new customers and increasing our customers’ usage of our platform and services. Our customers typically have relationships with numerous providers and can use both our platform and services and those of our competitors without incurring significant costs or disruption. Our customers may also choose to decrease their overall advertising spend for any reason, including if they do not believe they are receiving a sufficient return on their advertising spend. Accordingly, we must continually work to win new customers and retain existing customers, increase their usage of our platform and services and capture a larger share of their advertising spend. We may not be successful at educating and training customers, particularly our newer customers, on how to use our platform and services, in order for our customers to get the most benefit from our platform and services and increase their usage. If these efforts are unsuccessful or customers decide not to continue to maintain or increase their usage of our platform and services for any other reason, or if we fail to attract new customers, our revenue could fail to grow or decline, which would materially and adversely harm our business, operating results and financial condition. We cannot assure you that our customers will continue to use and increase their spend on our platform and service offerings or that we will be able to attract a sufficient number of new customers to continue to grow our business and revenue. If customers representing a significant portion of our business decide to materially reduce their use of our platform or service offerings or cease using them altogether, our revenue could be significantly reduced, which could have a material adverse effect on our business, operating results and financial condition. We may not be able to replace customers who decrease or cease their usage of our platform or service offerings with new customers that will use them to the same extent.

We may be unsuccessful in launching or marketing new products or services, or launching existing products and services into new markets, or we may be unable to successfully integrate new offerings into our existing platform, which would result in significant expense and may not achieve desired results.

We regularly evaluate expanding our products into new markets or launching new service offerings in existing or new markets and plan to expand our markets significantly. Any expansion or new offering requires significant expenses and the time of our key personnel, particularly at the outset of the process, and such new service offerings or expansion of our platform may not result in the customer conversion or profitability that we expect. Our plans to expand and deepen our market share in our existing markets and expand into additional markets are subject to a variety of risks and challenges. We cannot assure you that we will be able to increase revenue and create business model efficiencies in new markets in the manner we have in our more mature existing markets.

As we continue to expand, we may launch products or services in markets that prove to be more challenging for our business model. As we expand across new territories, we will have to adapt our business and operations to

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local conditions. If we are unable to adapt to these new markets and scale effectively, our business and results of operations may be adversely affected.

New markets and new product or service offerings may also subject us to new regulatory environments, which could increase our costs as we evaluate compliance with any new regulatory regime. Notwithstanding the expenses and time devoted to expanding an existing product or service offering into a new market or launching a new product offering, we may fail to achieve the financial and market share goals associated with the expansion. If we cannot manage our expansion efforts efficiently, our market share gains could take longer than planned and our related costs could exceed expectations. In addition, we could incur significant costs to seek to expand our market share, and still not succeed in attracting sufficient customers to offset such costs. See also “—Failure to manage our growth effectively could cause our business to suffer and have an adverse effect on its business, operating results and financial condition” and “—Future acquisitions, strategic investments or alliances could disrupt our business and harm our business, operating results and financial condition.”

We may not realize the expected benefits of an industry shift away from cookie-based consumer tracking and such shift may not occur as rapidly as we expect or may not be realized at all.

We expect to benefit as compared to others in our industry from marketers reducing their reliance on vendors and software platforms that rely on third-party cookies for tracking and ad-targeting. However, we cannot assure you that the shift away from cookie-based consumer tracking and ad- targeting will happen as rapidly as we expect or that such shift will occur at all. Additionally, even if the shift away from cookie-based consumer tracking does occur, we may not be as successful in growing our business and increasing revenue as expected. For example, marketers may not shift their business away from our competitors if our competitors are successful in developing alternative products or services that are not significantly reliant on the cookie-based framework.

The effects of the ongoing COVID-19 pandemic and other sustained adverse market events have had, and could in the future have, an adverse impact on our business, operating results and financial condition.

Our business and operations have been and could in the future be adversely affected by health epidemics, such as the global COVID-19 pandemic. The COVID-19 pandemic and efforts to control its spread have curtailed the movement of people, goods and services worldwide, including in the regions in which we and our customers and partners operate, and are significantly impacting economic activity and financial markets. Many marketers, particularly those in the travel, retail and automotive industries, decreased or paused their advertising spending as a response to the economic uncertainty, decline in business activity, and other COVID-19-related impacts, which has negatively impacted, and may continue to negatively impact, our revenue and results of operations, the extent and duration of which we may not be able to accurately predict. The spread of an infectious disease may also result in, and, in the case of the COVID-19 pandemic has resulted in, regional quarantines, labor shortages or stoppages, changes in consumer purchasing patterns, disruptions to service providers’ ability to deliver data on a timely basis, or at all, and overall economic instability.

A recession, depression or other sustained adverse market events resulting from the spread of COVID-19 could materially and adversely affect our business and that of our customers or potential customers. our customers’ and potential customers’ businesses or cash flows have been and may continue to be negatively impacted by the COVID-19 pandemic, which has led and may continue to lead them to reduce their advertising spending and delay their advertising initiatives or technology spending, which may materially and negatively impact our business, operating results and financial condition. Our customers may also seek adjustments to their payment terms, delay making payments or default on their payables, any of which may impact the timely receipt and/or collectability of our receivables. As a result, our financial condition and results of operations may be adversely impacted if the business or financial condition of our customers and marketers is negatively affected by the pandemic.

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Our operations are subject to a range of external factors related to the COVID-19 pandemic that are not within our control. We have taken precautionary measures intended to minimize the risk of the spread of the virus to our employees, partners and customers, and the communities in which we operate. A wide range of governmental restrictions have also been imposed on our employees’, customers’ and partners’ physical movement to limit the spread of COVID-19. There can be no assurance that precautionary measures, whether adopted by us or imposed by others, will be effective, and such measures could negatively affect our sales, marketing, and customer service efforts, delay and lengthen our sales cycles, decrease our employees’ or customers’ or partners’ productivity, or create operational or other challenges, any of which could harm our business, operating results and financial condition.

The economic uncertainty caused by the COVID-19 pandemic has made and may continue to make it difficult for us to forecast revenue and operating results and to make decisions regarding operational cost structures and investments. Our business depends on the overall demand for advertising and on the economic health of our customers that benefit from our platform and services. Economic downturns or unstable market conditions may cause our customers to decrease their advertising budgets, which could reduce usage of our platform and services and adversely affect our business, operating results and financial condition. We have committed, and we plan to continue to commit, resources to grow our business, including to expand our employee base and develop our platform, service offerings and systems, and such investments may not yield anticipated returns, particularly if worldwide business activity continues to be impacted by the COVID-19 pandemic. The duration and extent of the impact from the COVID-19 pandemic depend on future developments that cannot be accurately predicted at this time, and if we are not able to respond to and manage the impact of such events effectively, our business may be harmed. Such future developments may include, among others, the duration and spread of the outbreak, new information that may emerge concerning the severity of COVID-19 and government actions to contain COVID-19 or treat its impact, the level of relief efforts designed to help businesses and consumers, including any declines in such levels, impact on our customers and our sales cycles, impact on our customer, industry or employee events, and effect on our advertising inventory partners.

Our results may also fluctuate unpredictably as and to the extent there is a recovery from the pandemic and a return to non-pandemic business conditions. We cannot predict the impact of a post- pandemic recovery on the economy, our customers or consumer patterns or the degree to which certain trends will continue.

If we fail to innovate and make the right investment decisions in our offerings and platform, we may not attract and retain customers and our revenue and results of operations may decline.

Our industry is subject to rapid and frequent changes in technology, evolving customer needs and the frequent introduction by competitors of new and enhanced offerings. We must regularly make investment decisions regarding offerings and technology to maintain the technological competitiveness of our products and services and meet customer demand and evolving industry standards. The complexity and uncertainty regarding the development of new technologies and the extent and timing of market acceptance of innovative products and services create difficulties in maintaining this competitiveness. The success of any enhancement or new solution depends on many factors, including timely completion, adequate quality testing, appropriate introduction and market acceptance. Without the timely introduction of new products, services and enhancements, our offerings could become technologically or commercially obsolete over time, in which case our revenue and operating results would suffer. If new or existing competitors have more attractive offerings, we may lose customers or customers may decrease their use of our platform or services. New customer demands, superior competitive offerings or new industry standards could require us to make unanticipated and costly changes to our platform, service offerings or business model. If we fail to enhance our current products and services or fail to develop new products to adapt to our rapidly changing industry or to evolving customer needs, demand for our platform or services could decrease and our business, operating results and financial condition may be adversely affected.

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The market for programmatic buying for advertising campaigns is dynamic and evolving. If this market develops more slowly or differently than expected, our business, operating results and financial condition may be adversely affected.

We derive revenue from the sale of targeting digital advertising media through our platform. We expect that ad sales will continue to be our primary source of revenue for the foreseeable future, and that our revenue growth will largely depend on increasing customers’ usage of our platform and services. While the market for programmatic ad buying for mobile and desktop display ads is relatively established, the market in other channels such as connected TV (“CTV”) is still emerging, and our current and potential customers may not shift quickly enough into these channels, which would reduce our growth potential. If the market for programmatic ad buying deteriorates or develops more slowly than we expect, it could reduce demand for our platform and services, and our business, growth prospects and financial condition would be adversely affected.

In particular, the market for programmatic buying for advertising campaigns across multiple advertising channels is an emerging market. Our ability to provide capabilities across multiple advertising channels may be constrained if we are not be able to maintain or grow advertising inventory for channels, and some of our offerings may not gain market acceptance. We may not be able to accurately predict changes in overall industry demand for the channels in which we operate and cannot make assurances that our investment in channel development will correspond to any such changes. For example, we cannot predict whether the growth in demand for our CTV offering will continue. Furthermore, if our channel mix changes due to a shift in customer demand, such as customers shifting their usage more quickly or more extensively than expected to channels in which we have relatively less functionality, features, or inventory, such as linear TV, then demand for our platform and service offerings could decrease, and our business, financial condition, and results of operations could be adversely affected.

We receive a significant amount of revenue from certain advertising agencies and brand marketers, and the loss of such customers could harm our business, operating results and financial condition.

We had 306 active customers as of September 30, 2021, consisting primarily of independent advertising agencies and brand marketers and to a lesser extent, agencies owned by global holding companies.

We do not have exclusive relationships with advertising agencies and we depend on agencies to engage with us on advertising campaigns for their clients. The loss of such agencies could significantly harm our business, operating results and financial condition. If we fail to maintain satisfactory relationships with an advertising agency, we risk losing business from the brand marketers represented by that agency.

Brand marketers may change advertising agencies, or work with other platforms. If a brand marketer switches from an agency that utilizes our platform and services to one that does not, or chooses a different platform for direct engagement, we could lose revenue from that brand marketer. In addition, some advertising agencies have strong relationships with competing platforms and may direct their brand marketers to other providers.

We may experience fluctuations in its operating results, which could make its future operating results difficult to predict or cause our operating results to fall below securities analysts’ and investors’ expectations.

Our quarterly and annual operating results have fluctuated in the past, and we expect that our future operating results will fluctuate due to a variety of factors, many of which are beyond our control. Period- to-period comparisons of our operating results should not be relied upon as an indication of its future performance. Fluctuations in our operating results could cause our performance to fall below the expectations of securities analysts and investors, and adversely affect the price of our Common Stock. Because our business is changing and evolving rapidly, and the macroeconomic environment continues to evolve as a result of the COVID-19 pandemic, our historical operating results may not be necessarily indicative of our future operating

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results. It is also difficult to predict the impact of a post- pandemic recovery on our business and operating results. In addition, factors that may cause our operating results to fluctuate include the following:

Based upon the factors above and others beyond our control, we have a limited ability to forecast our future revenue, costs and expenses, and, as a result, our operating results may, from time to time, fall below our estimates or the expectations of securities analysts and investors.

Customers have the option to use our platform on a self-service basis, which requires us to commit substantial time and expenses towards training potential customers on how to make full use of our platform. If we fail to offer sufficient customer training and support for our platform, we may not be able to attract new customers or maintain our current customers.

Because we operate a platform that has many powerful tools, is capable of performing complicated campaign executions and customers can choose to use on a self-service basis, we may be required to spend a substantial amount of time and effort educating and training current customers and potential customers on how to make full use of our platform. Because potential customers may already be trained to use competitors’ platforms, we are also required to spend a significant amount of time cultivating relationships with those potential customers to ensure they understand the potential benefits of our platform and this relationship building process can take many months and may not result in us winning an opportunity with any given potential customer. As a result, customer training and support is critical for the successful and continued use of our platform and for maintaining and increasing spend through the platform from existing and new customers.

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Providing this training and support requires that our platform operations personnel have specific domain knowledge and expertise, making it more difficult for us to hire qualified personnel and to scale up our support operations due to the extensive training required. The importance of high-quality customer service will increase as we expand our business and pursue new customers. If we are not responsive and proactive regarding our customers’ advertising needs, or do not provide effective support for our customers’ advertising campaigns, our ability to retain existing customers would suffer and our reputation with existing or potential customers would be harmed, which would negatively impact our business.

We are subject to payment-related risks and if our customers do not pay, or dispute their invoices, our business, operating results and financial condition may be adversely affected.

We may be involved in disputes with customers over the operation of our platform and services, the terms of our service or our billings for purchases made by them through our platform. When we are unable to collect or make adjustments to our bills to customers, we incur write-offs for bad debt, which could have a material adverse effect on our results of operations for the periods in which the write-offs occur. In the future, bad debt may exceed reserves for such contingencies and our bad debt exposure may increase over time. Any increase in write-offs for bad debt could have a materially negative effect on our business, operating results and financial condition.

Furthermore, we are generally contractually required to pay suppliers of advertising inventory and data within a negotiated period of time, regardless of whether our customers pay on time, or at all. While we attempt to negotiate long payment periods with our suppliers and shorter periods from our customers, it is not always successful. As a result, our accounts payable are often due on shorter cycles than our accounts receivables, requiring us to remit payments from our own funds, and accept the risk of bad debt. Our standard payment terms range from 30 to 60 days. Our consolidated average days sales outstanding (“DSO”) for the year ended December 31, 2020, was 95 days, for the year ended December 31, 2019, was 94 days, for the nine months ended September 30, 2021, was 93 days, and for the nine months ended September 30, 2020, was 107 days. DSO is calculated by dividing average accounts receivable for the period by revenue recorded for the period multiplied by the number of days in the period. For the periods presented, our DSO has exceeded the standard payment terms of customers, because like many companies in its industry, we often experience slow payment by advertising agencies, such that advertising agencies must first collect payment from their customers before remitting payment to us. We evaluate the creditworthiness of customers on a regular basis. 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. We individually review all balances that exceed 90 days from the invoice date and assess for provisions for doubtful accounts based on an assessment of the balance that will not be collected. Factors considered include the aging of the receivable, historical write off experience, the creditworthiness of each agency customer, and general economic conditions. Account balances are charged off against the allowance after all means of collection have been exhausted and the potential for recovery is remote.

Days payable outstanding (“DPO”) is calculated by dividing the average accounts payable for the period presented by the expense activity classified as platform operations less allocated costs of our personnel and allocated depreciation and amortization for the periods presented multiplied by the number of days in the period. DPO for the year ended December 31, 2020, was 56 days and for the year ended December 31, 2019 was 55 days. No significant change is noted between periods. DPO for the nine months ended September 30, 2021, was 53 days and for the nine months ended September 30, 2020 was 59 days. No significant change is noted between periods.

DSO for the year ended December 31, 2020, was 95 days and for the year ended December 31, 2019 was 94 days. No significant change is noted between periods. DSO for the nine months ended September 30, 2021, was 93 days and for the nine months ended September 30, 2020 was 107 days. The decrease in DSO was primarily

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due to a decrease in customer payment cycles as compared to the nine-month period ended September 30, 2020 during which DSO had increased due to the impact of COVID-19 on customers.

This payment process will increasingly consume working capital if we continue to be successful in growing our business. In addition, like many companies in our industry, we often experience slow payment by advertising agencies, such that our liabilities may exceed our assets at times. If we are unable to borrow against our assets on commercially acceptable terms, our working capital availability could be reduced, and as a consequence our results of operations and financial condition would be adversely impacted.

Due to these timing considerations, we may rely on our credit facility and cash on hand (including net proceeds from this transaction) to partially or completely fund its working capital requirements. We cannot assure you that as we continues to grow, our business will generate sufficient cash flow from operations or that future borrowings will be available to us under the credit facility in an amount sufficient to fund our working capital needs. If our cash flows and credit facility borrowings are insufficient to fund our working capital requirements, we may not be able to grow at the rate we currently expect or at all. In addition, in the absence of sufficient cash flows from operations, we might be unable to meet our obligations under our credit facility and we may therefore be at risk of default thereunder. We cannot assure you that we would be able to access additional financing or increase our borrowing or borrowing capacity under our current or any future credit facility on commercially reasonable terms or at all.

If our access to advertising inventory is diminished or fails to grow, our revenue could decline and our growth could be impeded.

We must maintain a consistent supply of ad inventory. Our success depends on our ability to secure inventory on reasonable terms across a broad range of advertising inventory partners in various verticals and formats. The amount, quality and cost of inventory available to us can change at any time. If our relationships with any of our significant suppliers were to cease, or if the material terms of these relationships were to change unfavorably, our business would be negatively impacted. Our suppliers are generally not bound by long-term contracts. As a result, there is no guarantee that we will have access to a consistent supply of inventory on favorable terms. Inventory suppliers control the sales process for the inventory they supply, and their processes may not always work in our favor. For example, suppliers may place restrictions on the use of their inventory, including prohibiting the placement of advertisements on behalf of specific marketers.

As new types of inventory, such as digital advertising for television, become more readily available, we will need to expend significant resources to ensure that we have access to such new inventory. Although television advertising is a large market, only a relatively small percentage of it is currently purchased programmatically. We are investing heavily in our programmatic television offering, including by increasing our workforce and by adding new features, functions and integrations to our platform. If the digital television advertising market does not grow as we anticipate or it fails to successfully serve such a market, our growth prospects could be harmed.

Our success depends on consistently adding valued inventory in a cost-effective manner. If we are unable to maintain a consistent supply of inventory for any reason, customer retention and loyalty, and our operating results and financial condition could be harmed.

If we do not effectively grow and train our sales and support teams, we may be unable to add new customers or increase usage of our platform and services by our existing customers and our business will be adversely affected.

We are substantially dependent on our sales and support teams to obtain new customers and to increase usage of our platform and services by our existing customers. We believe that there is significant competition for sales personnel with the skills and technical knowledge that we require.

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Our ability to achieve revenue growth will depend, in large part, on our success in recruiting, training, integrating and retaining sufficient numbers of sales personnel to support our growth. Due to the complexity of our platform and services, a significant time lag exists between the hiring date of sales and support personnel and the time when they become fully productive. Our recent and planned hires may not become productive as quickly as we expect, 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. If we are unable to hire and train sufficient numbers of effective sales personnel, or the sales personnel are not successful in obtaining new customers or increasing our existing customers’ spend, our business will be adversely affected.

As our costs increase, we may not be able to generate sufficient revenue to sustain current level of profitability.

We anticipate continued growth that could require substantial financial and other resources to, among other things:

Investing in the foregoing, however, may not yield anticipated returns. Consequently, as our costs increase, we may not be able to generate sufficient revenue to achieve or sustain profitability.

We have plans to allow our customers to utilize application programming interfaces, or APIs, with our platform, which could result in outages or security breaches and negatively impact our business, operating results and financial condition.

We may permit our customers to access our platform using application programming interfaces, or APIs. To the extent this occurs, our APIs may allow customers to develop custom integration of their business with our platform. The use of APIs would increase security and operational risks to our systems, including the risk for intrusion attacks, data theft, or denial of service attacks. Furthermore, while APIs would allow customers greater ease and power in accessing our platform, they also present risks related to overusing our systems, potentially causing outages. While we intend to take measures to decrease security and outage risks associated with the use of APIs, we cannot guarantee that such measures will be successful. Our failure to prevent outages or security breaches resulting from API use could result in government enforcement actions against us, claims for damages by consumers and other affected individuals, costs associated with investigation, notification, mitigation, and remediation, damage to our reputation and loss of goodwill, any of which could have a material adverse impact on our business, operating results and financial condition.

Operational and performance issues with our platform, whether real or perceived, including a failure to respond to technological changes or to upgrade our technology systems, may adversely affect our business, operating results and financial condition.

We depend upon the sustained and uninterrupted performance of our platform to manage our inventory supply; acquire inventory for each campaign; collect, process and interpret data; and optimize campaign

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performance in real time and provide billing information to our financial systems. If our platform cannot scale to meet demand, if there are errors in our execution of any of these functions on our platform, or if we experience outages, then our business may be harmed.

Our platform is complex and multifaceted, and operational and performance issues could arise both from the platform itself or from outside factors, such as cyberattacks or other third-party attacks. Errors, failures, vulnerabilities or bugs have been found in the past, and may be found in the future. Our platform also relies on third-party technology and systems to perform properly, and our platform is often used in connection with computing environments utilizing different operating systems, system management software, equipment and networking configurations, which may cause errors in, or failures of, our platform or such other computing environments. Operational and performance issues with our platform could include the failure of our user interface, outages, errors during upgrades or patches, discrepancies in costs billed versus costs paid, unanticipated volume overwhelming our databases, server failure, or catastrophic events affecting one or more server facilities. While we have built redundancies in our systems, full redundancies do not exist. Some failures could shut our platform down completely, others only partially.

As we grow our business, we expect to continue to invest in technology services and equipment. Without these improvements, our operations might suffer from unanticipated system disruptions, slow transaction processing, unreliable service levels, impaired quality or delays in reporting accurate information regarding transactions in our platform, any of which could negatively affect our reputation and ability to attract and retain customers. In addition, the expansion and improvement of our systems and infrastructure may require us to commit substantial financial, operational and technical resources, with no assurance our business will grow. If we fail to respond to technological change or to adequately maintain, expand, upgrade and develop our systems and infrastructure in a timely fashion, our growth prospects and results of operations could be adversely affected.

Operational and performance issues with its platform could also result in negative publicity, damage to our brand and reputation, loss of or delay in market acceptance of our platform, increased costs or loss of revenue, loss of the ability to access our platform, loss of competitive position or claims by customers for losses sustained by them. Alleviating problems resulting from such issues could require significant expenditures of capital and other resources and could cause interruptions, delays or the cessation of our business, any of which may adversely affect our operating results and financial condition.

If our access to data is diminished, the effectiveness of our platform and services would be decreased, which could harm our operating results and financial condition.

A portion of the data that we use is obtained through integrations with third-party data suppliers. We are dependent upon our ability to obtain necessary data licenses on commercially reasonable terms. We could suffer material adverse consequences if we were unable to obtain data through our integrations with data suppliers. Our ability to serve particular customers is also enhanced when such customers upload their own data. Our operation of our platform and access to data could be negatively affected if, due to legal, contractual, privacy, market optics, competition or other economic concerns, third parties cease entering into data integration agreements with us or customers cease uploading their data to our platform.

Additionally, we could terminate relationships with our data suppliers if they fail to adhere to our data quality and privacy standards.

If we were to lose access to significant amounts of the data that enables our framework, our ability to provide products and services to customers could be materially and adversely impacted, which could be materially adverse to our business, operating results and financial condition. See “—Our business or ability to operate our platform could be impacted by changes in the technology industry by established technology companies or government regulation. Such developments, including the restriction of “third-party cookies,” could cause instability in the advertising technology industry.”

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We are dependent on the continued availability of third-party hosting and transmission services. Operational issues with, or changes to the costs of, our third-party data center providers could harm our business, reputation or results of operations.

We currently serve the majority of our platform functions from third-party data center hosting facilities, and we primarily use shared servers in such facilities. We are dependent on these third parties to provide continuous power, cooling, Internet connectivity and physical and technological security for its servers, and its operations depend, in part, on their ability to protect these facilities against any damage or interruption from natural disasters, such as earthquakes and hurricanes, power or telecommunication failures, criminal acts and similar events. In the event that any of our third-party facilities arrangements are terminated, or if there is a lapse of service or damage to a facility, we could experience interruptions in our platform as well as delays and additional expenses in arranging new facilities and services.

Any damage to, or failure of, the systems of our third-party providers could result in interruptions to our platform. Despite precautions taken at our data centers, the occurrence of spikes in usage volume, a natural disaster, such as an earthquake or hurricane, an act of terrorism, vandalism or sabotage, a decision to close a facility without adequate notice, or other unanticipated problems at a facility could result in lengthy interruptions in the availability of its platform. Even with current and planned disaster recovery arrangements, our business could be harmed. Also, in the event of damage or interruption, our insurance policies may not adequately compensate us for any losses that we may incur. These factors in turn could further reduce our revenue, subject us to liability and cause us to issue credits or cause customers to stop using our platform, any of which could materially and adversely affect our business.

We incur significant costs with our third-party data hosting services. If the costs for such services increase due to vendor consolidation, regulation, contract renegotiation, or otherwise, we may not be able to increase the fees for our products and services to cover the changes. As a result, our operating results may be significantly worse than forecasted.

If the non-proprietary technology, software, products and services that we use are unavailable, have future contractual terms we cannot agree to, or do not perform as we expect, our business, operating results and financial condition could be harmed.

We depend on various technology, software, products and services from third parties or available as open source, including for critical features and functionality of our platform and tools, payment processing, payroll and other professional services. Identifying, negotiating, complying with and integrating with third-party terms and technology are complex, costly and time-consuming matters. Failure by third-party providers to maintain, support or secure their technology either generally or for our accounts specifically, or downtime, errors or defects in their products or services, could materially and adversely impact our platform, our administrative obligations or other areas of our business. Having to replace any third-party providers or their technology, products or services could result in outages or difficulties in our ability to provide its services.

Our failure to meet content and inventory standards and provide services that our customers and inventory suppliers trust could harm our brand and reputation and negatively impact our business, operating results and financial condition.

We do not provide or control the content of the advertisements we serve or that of the websites providing the inventory. Our customers provide the advertising content and inventory suppliers provide the inventory. Both customers and inventory suppliers are concerned about being associated with content they consider inappropriate, competitive or inconsistent with their brands, or illegal, and they are hesitant to spend money without guaranteed brand security. Consequently, our reputation depends in part on providing services that our customers and inventory suppliers trust. We prohibits the misuse of our platform by our agency and their brand marketer customers, and certain suppliers. Additionally, we use our proprietary technology and third-party services to, and

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we participate in industry co- ops that work to, detect malware and other content issues as well as click fraud (whether by humans or software known as “bots”) and to block fraudulent inventory. Despite such efforts, our customers may inadvertently purchase inventory that proves to be unacceptable for their campaigns, in which case we may not be able to recoup the amounts paid to inventory suppliers. Preventing and combating fraud is an industry-wide issue that requires constant vigilance, as well as a balancing of cost effectiveness and risk, and we cannot guarantee that we will be fully successful in our efforts to combat fraud. We may provide access to inventory that is objectionable to our customers or we may serve advertising that contains malware or objectionable content to our inventory suppliers, which could harm our or our customers’ brands and reputation, cause customers to decrease or terminate their relationship with us or otherwise negatively impact our business, operating results and financial condition.

We may have long sales cycles, which can result in significant time between initial contact with a prospect and converting that prospect to a customer, making it difficult to project when, if at all, we will obtain new customers and when we will generate revenue from those customers.

Our sales cycle, from initial contact to campaign implementation and payment collection, can take significant time, on average about 45 days. As part of its sales cycle, we may incur significant expenses before we generate any revenue from a prospective customer. We have no assurance that the substantial time and money spent on our sales efforts will generate significant revenue. If conditions in the marketplace, generally or with a specific prospective customer, change negatively, it is possible that we will be unable to recover any of these expenses. Our sales efforts involve educating our customers about the use, technical capabilities and benefits of our platform and service offerings. Some of our customers undertake an evaluation process that frequently involves not only our platform and services but also the offerings of our competitors. As a result, it is difficult to predict when we will obtain new customers and begin generating revenue from these new customers. Even if our sales efforts result in obtaining a new customer, the customer controls when and to what extent it uses our platform and services and therefore the amount of revenue generated, and we may not sufficiently justify the expenses incurred to acquire the customer and the related training support. As a result, we may not be able to add customers, or generate revenue, as quickly as we may expect, which could harm our growth prospects.

We face potential liability and harm to our business based on the human factor of inputting information into our platform.

We or our customers set up campaigns on our platform using a number of available variables. While our platform includes several checks and balances, it is possible for human error to result in significant over-spending. For example, campaigns which last for a period of time can be set to pace evenly or as quickly as possible. If a customer with a high credit limit enters an incorrect daily cap with a campaign set to a rapid pace, it is possible for a campaign to accidently go significantly over budget. Our potential liability for such errors may be higher when they occur in situations in which we are executing purchases on behalf of a customer rather than the customer using the self-service feature of our platform.

The market growth forecasts provided by us may prove to be inaccurate and, even if the market in which we compete achieves forecasted growth, we cannot assure you that our business will grow at similar rates, if at all.

Market growth forecasts are subject to significant uncertainty and are based on assumptions and estimates which may not prove to be accurate. The forecasts provided by us relating to expected growth in the digital advertising and programmatic ad markets may prove to be inaccurate. Even if these markets experience the forecasted growth, we may not grow its business at similar rates, or at all. Our growth is subject to many factors including our success in implementing our business strategy, which is subject to many risks and uncertainties.

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RISKS RELATED TO DATA PRIVACY

Changes in legislative, judicial, regulatory, or cultural environments relating to information collection, use and processing may limit our ability to collect, use and process data. Such developments could cause revenue to decline, increase the cost of data, reduce the availability of data and adversely affect the demand for our products and services.

As a demand side platform within the digital programmatic ecosystem, we receive, store and process certain personal information and other data from and about consumers in addition to personal information and other data from and about our customers, employees, and services providers. Our handling of this data is subject to a wide variety of federal, state, and foreign laws and regulations and is subject to regulation by various government authorities and consumer actions. Our data handling is also subject to contractual obligations and may be deemed to be subject to industry standards.

The U.S. federal and various state and foreign governments have adopted or proposed laws relating to the collection, disclosure, processing, use, storage and security of data relating to individuals and households, including the use of contact information and other data for marketing, advertising and other communications with individuals and businesses. In the U.S., various laws and regulations apply to the collection, disclosure, processing, use, storage and security of certain types of data. Additionally, the FTC, many state attorneys general, and many courts are interpreting federal and state consumer protection laws as imposing standards for the collection, disclosure, process, use, storage and security of data. The regulatory framework for data privacy issues worldwide is complex, continually evolving and often conflicting, and is likely to remain uncertain for the foreseeable future. The occurrence of unanticipated events often rapidly drives the adoption of legislation or regulation affecting the use, collection or other processing of data and the manner in which we conduct our business. As a result, further restrictions could be placed upon the collection, disclosure, processing, use, storage and security of information, which could result in a material increase in the cost of obtaining certain kinds of data and could limit the ways in which we may collect, disclose, process, use, store or secure information.

U.S. federal and state legislatures, along with federal regulatory authorities, have recently increased their focus on matters concerning the collection and use of consumer data, including relating to interest- based advertising, or the use of data to draw inferences about a user’s interests and deliver relevant advertising to that user, and similar or related practices, such as cross-device data collection and aggregation, and steps taken to de-identify personal data and to use and distribute the resulting data, including for purposes of personalization and the targeting of advertisements. In the U.S., non-sensitive consumer data generally may be used under current rules and regulations, subject to certain restrictions, including relating to transparency and affirmative “opt-out” rights of the collection or use of such data in certain instances. To the extent additional opt-out rights are made available in the U.S., additional regulations are imposed, or if an “opt-in” model were to be adopted, less data would be available, the cost of data and compliance would be higher, or we could be required to modify our data processing practices and policies. For example, California recently enacted legislation, the CCPA, that became operative on January 1, 2020 and came under California Attorney General (“AG”) enforcement on July 1, 2020. The CCPA requires covered companies to, among other things, provide new disclosures to California consumers and grant such consumers a new right to opt-out of “sales” of personal information, a concept that is defined broadly. The CCPA is also subject to regulations issued by the California AG, which were finalized and became effective in August 2020. The California Privacy Rights and Enforcement Act (“CPRA”), which was passed as a ballot initiative in November 2020 and comes into effect on January 1, 2023, expands upon the CCPA and, among other things, creates new categories of personal information with additional protections, creates new data subject rights such as a right of correction, creates a new state rulemaking and enforcement agency for the CPRA, expands potential liability for violations and gives consumers rights to opt out of additional forms of data sharing with third parties. It remains unclear how aspects of the CCPA (as amended by the CPRA) or its implementing regulations will be interpreted. We cannot yet fully predict the impact of these laws on our business or operations, but it or future regulations (particularly any regulations using an “opt- in” model), could require us or our customers to modify data processing practices and policies and to incur

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substantial costs and expenses in an effort to comply. Decreased availability and increased costs of information and costs of compliance could adversely affect our ability to meet our customers’ expectations and requirements and could result in decreased revenue.

While our platform and framework operate primarily in the United States and Canada, some of its operations may subject it to data privacy laws outside the United States. In the European Union (“EU”), the European General Data Protection Regulation (“GDPR”) took effect on May 25, 2018 and applies to our processing of personal data related to individuals who are in the European Union. The GDPR includes significant penalties for noncompliance of up to the greater of €20 million or 4% of an enterprise’s global turnover (or revenue) for the preceding fiscal year, and each European Union Member State may provide for other penalties applicable to such noncompliance.

We are subject to evolving laws and regulations that dictate whether, how, and under what circumstances we, or our data processors, may transfer, process and/or receive certain data, including data shared between countries or regions in which we operate and data shared among our products and services. For example, ongoing legal uncertainty in Europe regarding the transfer of data to the United States could result in further limitations, including in light of the recent Schrems II ruling from the Court of Justice of the European Union dated July 16, 2020. This ruling effectively invalidated the EU-U.S. Privacy Shield framework, and while it upheld the Standard Contractual Clauses (“SCCs”) as an alternative mechanism, it requires the parties to the SCCs to ensure that the level of protection required by European Union law is respected, potentially by yet-to-be-clarified supplementary measures. Similarly, legal uncertainty could result in further limitations regarding the United Kingdom, which exited the European Union on January 31, 2020, in particular in relation to data transfers to and from the United Kingdom. Certain countries outside of the European Union have also passed (e.g. Russia, China) or are considering passing laws requiring local data residency or otherwise impeding the transfer of data across borders. If one or more of the legal bases for transferring data is invalidated, if we are unable to transfer or receive data between and among countries and regions in which we operates, or if we are prohibited from sharing data among our products and services, it could affect the manner in which we provide our services or adversely affect our financial results.

In addition to government regulation, self-regulatory standards and other industry standards may legally or contractually apply to us or be argued to apply to us, or we may elect to comply with such standards or to facilitate our customers’ compliance with such standards. Because privacy, data protection, and information security are competitive factors in our industry, we may make statements on our website, in marketing materials, or in other settings about our data security measures and our compliance with, or our ability to facilitate our customers’ compliance with, these standards. We are a member of self-regulatory bodies that impose additional requirements related to the collection, use, and disclosure of consumer data. Under the requirements of these self-regulatory bodies, in addition to other compliance obligations, we are obligated to provide all consumers with notice about our use of cookies and other technologies to execute the collection of consumer data and of our collection and use of consumer data for certain purposes, and to provide consumers with certain choices relating to the use of consumer data. 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.

Regulatory investigations and enforcement actions could also impact us. In the United States, the FTC uses its enforcement powers under Section 5 of the Federal Trade Commission Act (which prohibits “unfair” and “deceptive” trade practices) to investigate companies engaging in online tracking and the processing of consumer personal information more generally. Advocacy organizations have also filed complaints with applicable data protection authorities against advertising technology companies, arguing that certain of these companies’ practices do not comply with the GDPR or other applicable authorities. It is possible that investigations or enforcement actions will involve our practices or similar practices.

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Our legal risk depends in part on our customers’ or other third parties’ adherence to privacy laws and regulations and their use of our services in ways consistent with end user expectations. We rely on representations made to us by customers and data suppliers that they will comply with all applicable laws, including all relevant privacy and data protection regulations. Although we make reasonable efforts to enforce such representations and contractual requirements, we do not fully audit our customers’ or data suppliers’ compliance with our recommended disclosures or their adherence to privacy laws and regulations. If our customers or data suppliers fail to adhere to our expectations or contracts in this regard, we and our customers or data suppliers could be subject to adverse publicity, damages, and related possible investigation or other regulatory activity.

Because the interpretation and application of privacy and data protection laws, regulations and standards are uncertain, it is possible that these laws, regulations and standards may be interpreted and applied in manners that are, or are asserted to be, inconsistent with our data management practices or the technological features of our products and services. If so, in addition to the possibility of fines, investigations, lawsuits and other claims and proceedings, it may be necessary or desirable for us to fundamentally change our business activities and practices or modify our products and services, which could have an adverse effect on our business. We may be unable to make such changes or modifications in a commercially reasonable manner or at all. Any inability to adequately address privacy concerns, even if unfounded, or any actual or perceived failure to comply with applicable privacy or data protection laws, regulations, standards or policies, could result in additional cost and liability to us, damage our reputation, inhibit sales and harm our business. Furthermore, the costs of compliance with, and other burdens imposed by, the laws, regulations, standards and policies that are applicable to the businesses of our customers may limit the use and adoption of, and reduce the overall demand for, our platform. Privacy concerns, whether valid or not valid, may inhibit market adoption of our platform particularly in certain industries and foreign countries.

Adapting our business to the CCPA and its implementing regulations and to the enhanced and evolving privacy obligations in the EU and elsewhere could continue to involve substantial expense and may cause us to divert resources from other aspects of our operations, all of which may adversely affect our business. Further, adaptation of the digital advertising marketplace requires increasingly significant collaboration between participants in the market, such as publishers and marketers. Failure of the industry to adapt to changes required for operating under laws including the CCPA and the GDPR and user response to such changes could negatively impact inventory, data, and demand. We cannot control or predict the pace or effectiveness of such adaptation, and we cannot currently predict the impact such changes may have on our business.

Our business or ability to operate our platform could be impacted by changes in the technology industry by established technology companies or government regulation. Such developments, including the restriction of “third-party cookies,” could cause instability in the advertising technology industry.

Digital advertising and in-app advertising are largely dependent on established technology companies and their operation of the most commonly used Internet browsers (Chrome, Firefox, Internet Explorer and Safari), devices and their operating systems (Android and iOS). These companies may change the operations or policies of their browsers, devices and operating systems in a manner that fundamentally changes our ability to operate our platform or collect data. Users of these browsers, devices or operating systems may also adjust their behaviors and use of technology in ways that change our ability to collect data. Digital advertising and in-app advertising are also dependent, in part, on internet protocols and the practices of internet service providers, including IP address allocation. Changes that these providers make to their practices, or adoption of new internet protocols, may materially limit or alter the availability of data. A limitation or alteration of the availability of data in any of these or other instances may have a material impact on the advertising technology industry, which could decrease advertising budgets and subsequently reduce our revenue and adversely affect our business, operating results and financial condition.

For example, browser providers have recently enacted changes restricting the use of third-party cookies in their browsers, which may cause instability in the digital advertising market. Execution of digital advertising

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relies to a significant extent on the use of cookies, pixels and other similar technology, including mobile device identifiers that are provided by mobile operating systems for advertising purposes, to collect data about users and devices. Although our business is less reliant on cookies than some of its competitors because it does not need cookies to target digital ads effectively, we may use third-party cookies, to the extent available, as a targeting component or in other capacities such as attribution or frequency capping. Third-party cookies are cookies owned and used by parties other than the owners of the website visited by the Internet user, in connection with their business for obtaining information about consumers, and for delivering digital advertising. In June 2021, Google publicly stated it intends for Chrome to phase out third-party cookies by the end of 2023, and it is possible Google will make additional related announcements. Google has also introduced ad blocking software in its Chrome web browser that will block certain ads based on quality standards established under a multi-stakeholder coalition. Additionally, the Safari browser currently blocks third-party cookies by default and has recently added controls that algorithmically block or limit some cookies. Other browsers have added similar controls. These actions will have significant impacts on the digital advertising and marketing ecosystems in which we operate, which could cause changes in advertising budget allocations and thereby could negatively impact its business.

For in-app advertising, data regarding interactions between users and devices are tracked mostly through stable, pseudonymous mobile device identifiers that are built into the device operating system with privacy controls that allow users to express a preference with respect to data collection for advertising, including to disable the identifier. These identifiers and privacy controls are defined by the developers of the mobile platforms and could be changed by the mobile platforms in a way that may negatively impact our business. Privacy aspects of other channels for programmatic advertising, such as CTVs or over- the-top video, are still developing. Technical or policy changes, including regulation or industry self- regulation, could harm our growth in those channels.

Digital advertising is also subject to government regulation which may impact our ability to collect and use data. As the collection and use of data for digital advertising has received ongoing media attention over the past several years, some government regulators, such as the FTC, and privacy advocates have raised significant concerns around observed data. There has been an array of ‘do-not-track’ efforts, suggestions and technologies introduced to address these concerns. However, the potential regulatory and self-regulatory landscape is inherently uncertain, and there is no consensus definition of tracking, nor agreement on what would be covered by ‘do-not-track’ functionality. There is activity by the major Internet browsers to make ‘do-not-track’ functionality the default setting, including by Safari and Firefox. It is not clear if other Internet browsers will follow.

Limitations on our or our customers’ ability to collect and use data for advertising, whether imposed by established technology companies or U.S. legislation, or otherwise, may impact the performance of our platform and our results of operations.

Uncertainty caused by lack of uniformity among laws to which we are or may become subject and instability in the global legal landscape may cause us to incur additional or unexpected costs and legal risk, increase our risk of reputational harm, or cause us to change our platform, service offerings or business model.

We cannot predict the future of the regulatory landscape regarding the protection of personal information. U.S. (state and federal) and foreign governments are considering enacting additional legislation related to privacy and data protection and we expect to see an increase in, or changes to, legislation and regulation in this area. For example, in the U.S., a federal privacy law is the subject of active discussion and several bills have been introduced. Additionally, industry groups in the U.S. and their international counterparts have self-regulatory guidelines that are subject to periodic updates to which we have agreed to adhere. High profile incidents involving breaches of personal information or misuse of consumer information may increase the likelihood of new U.S. federal, state, or international laws or regulations in addition to those set out above, and such laws and regulations may be inconsistent across jurisdictions.

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In addition to laws regulating the processing of personal information, we are also subject to regulation with respect to political advertising activities, which is governed by various federal and state laws in the U.S., and national and provincial laws worldwide. Online political advertising laws are rapidly evolving, and in certain jurisdictions have varying transparency and disclosure requirements. The lack of uniformity and increasing requirements on transparency and disclosure could adversely impact the inventory made available for political advertising and the demand for such inventory on our platform, and otherwise increase our operating and compliance costs. Concerns about political advertising, whether or not valid and whether or not driven by applicable laws and regulations, industry standards, customer or inventory provider expectations, or public perception, may harm our reputation, result in loss of goodwill, and inhibit use of our platform and services by current and future customers.

Additionally, as the advertising industry evolves, and new ways of collecting, combining and using data are created, governments may enact legislation in response to technological advancements and changes that could result in us having to redesign features or functions of our platform, therefore incurring unexpected compliance costs.

These laws and other obligations may be interpreted and applied in a manner that is inconsistent with our existing data management practices or the features of our platform. If so, in addition to the possibility of fines, lawsuits and other claims, we could be required to fundamentally change our business activities and practices or modify our products, which could have an adverse effect on its business. We may be unable to make such changes and modifications in a commercially reasonable manner or at all, and our ability to develop new products and features could be limited. All of this could impair our or our customers’ ability to collect, use, or disclose information relating to consumers, which could decrease demand for our platform and services, increase our costs, and impair our ability to maintain and grow our customer base and increase our revenue.

Commitments to advertising technology industry self-regulation may subject us to investigation by government or self-regulatory bodies, government or private litigation, and operational costs or harm to our reputation or brand.

In addition to its legal obligations, we have committed to comply, and generally requires our customers and partners to comply, with applicable self-regulatory principles, such as the Network Advertising Initiative’s Code of Conduct and the Digital Advertising Alliance’s Self-Regulatory Principles for Online Behavioral Advertising in the U.S., and similar self-regulatory principles in Europe and Canada adopted by the local Digital Advertising Alliance.

Trade associations and industry self-regulatory groups have also promulgated best practices and other industry standards relating to targeted advertising. Our efforts to comply with these self- regulatory principles include offering Internet users notice and choice when advertising is served to them based, in part, on their interests. If we or our customers or partners make mistakes in the implementation of these principles, or if self-regulatory bodies expand these guidelines or government authorities issue different guidelines regarding Internet-based advertising, or opt out mechanisms fail to work as designed, or if Internet users misunderstand our technology or our commitments with respect to these principles, we may, as a result, be subject to negative publicity, government investigation, government or private litigation, or investigation by self-regulatory bodies or other accountability groups. Any such action against us, or investigations, even if meritless, could be costly and time consuming, require us to change our business practices, cause us to divert management’s attention and our resources, and be damaging to our brand, reputation, and business. In addition, privacy advocates and industry groups may propose new and different self-regulatory standards that either legally or contractually apply to us. We cannot yet determine the impact such future standards may have on our business.

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Unfavorable publicity and negative public perception about our industry, particularly concerns regarding data privacy and security relating to our industry’s technology and practices, and perceived failure to comply with laws and industry self-regulation, could adversely affect our business and operating results.

With the growth of digital advertising and e-commerce, there is increasing awareness and concern among the general public, privacy advocates, mainstream media, governmental bodies and others regarding marketing, advertising, and data privacy matters, particularly as they relate to individual privacy interests and the global reach of the online marketplace. Concerns about industry practices with regard to the collection, use, and disclosure of personal information, whether or not valid and whether driven by applicable laws and regulations, industry standards, customer or inventory provider expectations, or the broader public, may harm our reputation, result in loss of goodwill, and inhibit use of our platform and services by current and future customers. Any unfavorable publicity or negative public perception about us, our industry, including our competitors, or even other data focused industries can affect our business and results of operations, and may lead to digital publishers or its customers changing their business practices or additional regulatory scrutiny or lawmaking that affects us or our industry. For example, in recent years, consumer advocates, mainstream media and elected officials have increasingly and publicly criticized the data and marketing industry for its collection, storage and use of personal data. Additional public scrutiny may lead to general distrust of our industry, consumer reluctance to share and permit use of personal data, increased consumer opt-out rates or increased private class actions, any of which could negatively influence, change or reduce our current and prospective customers’ demand for our products and services, subject us to liability and adversely affect our business and operating results.

RISKS RELATED TO OUR INTELLECTUAL PROPERTY AND TECHNOLOGY

Our internal information technology systems may fail or suffer security breaches, loss or leakage of data, and other disruptions, which could disrupt our business or result in the loss of critical and confidential information.

The evolution of technology systems introduces ever more complex security risks that are difficult to predict and defend against. An increasing number of companies, including those with significant online operations, have recently disclosed breaches of their security, some of which involved sophisticated tactics and techniques allegedly attributable to criminal enterprises or nation-state actors. Successful breaches, employee malfeasance, or human or technological error could result in, for example, unauthorized access to, disclosure, modification, misuse, loss, or destruction of company, customer, or other third-party data or systems; theft of sensitive, regulated, or confidential data including personal information and intellectual property; the loss of access to critical data or systems through ransomware, destructive attacks or other means; and business delays, service or system disruptions or denials of service. We experience cyber incidents and other security incidents of varying degrees from time to time, and there can be no assurance that any future incidents would not lead to costs or consequences that materially impact our operations or business. In response to these incidents, we have implemented controls, conducted security assessments and taken other preventative actions to further strengthen our systems against future incidents. However, we cannot guarantee that such measures will provide sufficient security, that we will be able to react in a timely manner, or that our remediation efforts following an assessment or a cybersecurity incident will be successful.

In addition, we do not know whether our current practices will be deemed sufficient under applicable laws or whether new regulatory requirements might require us to make significant changes to our current practices. If there is a breach of our computer systems, and we know or suspect that certain personal information has been accessed, or used inappropriately, we may need to inform the affected individual and may be subject to significant fines and penalties. Further, under certain regulatory schemes, we may be liable for statutory damages on a per-breached record basis, irrespective of any actual damages or harm to the individual. In the event of a breach we could face government scrutiny or consumer class actions alleging statutory damages amounting to hundreds of millions, and possibly billions, of dollars.

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The risk of cybersecurity incidents directed at us or our third-party vendors includes uncoordinated individual attempts to gain unauthorized access to information technology systems, as well as to sophisticated and targeted measures known as advanced persistent threats. In addition, we face the risk of confidential data inadvertently leaking through human or technological errors.

Cybersecurity incidents are also constantly evolving, increasing the difficulty of detecting and successfully defending against them. In the ordinary course of its business, we and our third-party vendors collect and store personal information, as well as our proprietary business information and intellectual property and that of our customers and employees.

Additionally, we rely on third parties and their security procedures for the secure storage, processing, maintenance, and transmission of information that is critical to our operations. Despite measures designed to prevent, detect, address, and mitigate cybersecurity incidents, such incidents may occur to us or our third-party providers and, depending on their nature and scope, could potentially result in the misappropriation, destruction, corruption or unavailability of critical data and confidential or proprietary information (our own or that of third parties, including personal information of our customers and employees) and the disruption of business operations. Any such compromises to our security, or that of our third-party vendors, could cause customers to lose trust and confidence in us and stop using our website and mobile applications. In addition, we may incur significant costs for remediation that may include liability for stolen assets or information, repair of system damage, and compensation to customers, employees, and business partners. We may also be subject to government enforcement proceedings and legal claims by private parties. Actual or anticipated attacks may cause us to incur increasing costs, including costs to deploy additional personnel and protection technologies, train employees and engage third-party experts and consultants.

Any actual or alleged security breaches or alleged violations of federal or state laws or regulations relating to privacy and data security could result in mandated user notifications, litigation, government investigations, significant fines, and expenditures; divert management’s attention from operations; deter people from using our platform and services; damage our brand and reputation; and materially adversely affect our business, results of operations, and financial condition. Defending against claims or litigation based on any security breach or incident, regardless of their merit, will be costly and may cause reputational harm. The successful assertion of one or more large claims against us that exceed available insurance coverage, denial of coverage as to any specific claim, or any change in or cessation of our insurance policies and coverages, including premium increases or the imposition of large deductible requirements, could have a material adverse effect on our business, results of operations, and financial condition.

Our proprietary rights may be difficult to enforce, which could enable others to copy or use aspects of our technology 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. If we fail to protect our intellectual property rights adequately, our competitors might gain access to our technology and our business might be adversely affected. We rely on a combination of patent, trademark, copyright and trade secret laws, as well as third-party confidentiality and non-disclosure agreements, to establish and protect our proprietary rights.

Establishing trade secret, copyright, trademark, domain name, and patent protection can be difficult and expensive, and the laws, procedures and restrictions may provide only limited protection. 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. The theft or misuse of our proprietary information could occur by employees or contractors who have access to its technology.

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While we have patent applications pending, we may be unable to obtain patent protection for the technology covered in our patent applications or such patent protection may not be obtained quickly enough to meet our business needs. Furthermore, the patent prosecution process is expensive, time-consuming, and complex, and we may not be able to prepare, file, prosecute, maintain, and enforce all necessary or desirable patent applications at a reasonable cost or in a timely manner. The scope of patent protection also can be reinterpreted after issuance and issued patents may be invalidated. Even if our patent applications do issue as patents, they may not issue in a form that is sufficiently broad to protect our technology, prevent competitors or other third parties from competing with us or otherwise provide us with any competitive advantage.

Policing unauthorized use of our technology is difficult. 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 enforcing proprietary rights in such countries may be inadequate. If we are unable to protect our proprietary rights (including in particular, the proprietary aspects of its platform) we may find itself at a competitive disadvantage to others who have not incurred the same level of expense, time and effort to create and protect their intellectual property.

We may be subject to third-party claims for alleged infringement of proprietary rights, which could result in additional expense and potential damages.

To the extent we gain greater public recognition, we may face a higher risk of being the subject of intellectual property claims. There is significant patent and other intellectual property development activity in the digital advertising industry. Third-party intellectual property rights may cover aspects of our technologies or business methods or block us from expanding our offerings. Our success depends on the continual development of our platform. We may receive claims from third parties that our platform and underlying technology infringe or violate such third parties’ intellectual property rights. The cost of defending against such claims, whether or not the claims have merit, is significant, regardless of whether we are successful in our defense, and could divert the attention of management, technical personnel and other employees from our business operations.

Litigation regarding intellectual property rights is inherently uncertain due to the complex issues involved, and we may not be successful in defending against such matters. Additionally, we may be obligated to indemnify our customers or inventory and data suppliers in connection with any such litigation. If we are found to infringe these rights, we could potentially be required to cease utilizing portions of our platform. We may also be required to develop alternative non-infringing technology, which could require significant time and expense. Alternatively, we could be required to pay royalty payments, either as a one-time or ongoing fee, as well as damages for past use that was deemed to be infringing. If we cannot license or develop technology for any allegedly infringing aspect of its business, we would be forced to limit our service and may be unable to compete effectively. Any of these results could harm our business.

We face potential liability and harm to our business based on the nature of our business and the content on our platform.

Advertising often results in litigation relating to copyright or trademark infringement, public performance royalties or other claims based on the nature and content of advertising that is distributed through our platform. We do not independently verify whether it is permitted to deliver, or review the content of, such advertisements. If any of these representations are untrue, we may be exposed to potential liability and our reputation may be damaged. In addition to settlement costs, we may be responsible for our own litigation costs, which can be extensive.

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RISKS RELATING TO GOVERNMENTAL REGULATION

Our business is subject to a wide range of laws and regulations, many of which are evolving, and failure to comply with such laws and regulations could harm our business, financial condition, and results of operations.

Our business is subject to regulation by various federal, state, local and foreign governmental agencies, including agencies responsible for monitoring and enforcing employment and labor laws, consumer protection laws, anti-bribery laws, import and export controls, federal securities laws, and tax laws and regulations. These laws and regulations impose added costs on our business and could require us to make changes to our business, platform or service offerings. Noncompliance with applicable regulations or requirements could subject us to investigations, enforcement actions, sanctions, fines, damages, penalties, injunctions or termination of contracts. Any such matters could have a material adverse effect on our business, results of operations and financial condition.

GENERAL RISK FACTORS RELATING TO OUR BUSINESS

The market in which we participate is intensely competitive and fragmented, and we may not be able to compete successfully with our current or future competitors.

We operate in a highly competitive and rapidly changing industry that is subject to changing technology and customer demands and that includes many companies providing competing solutions. With the introduction of new technologies and the influx of new entrants into the market, we expect competition to persist and intensify in the future, which could harm our ability to increase revenue and maintain profitability. New technologies and methods of buying advertising present a dynamic competitive challenge, as market participants offer multiple new products and services aimed at capturing advertising spend.

We compete with smaller, privately held companies, with public companies such as The Trade Desk, as well as with divisions of large, well-established companies such as Google. AdTheorent’s current and potential competitors may have significantly more financial, technical, marketing and other resources than we have, allowing them to devote greater resources to the development, promotion, sale and support of their products and services. They may also have more extensive customer bases and broader supplier relationships than we have. As a result, these competitors may be better able to respond quickly to new technologies, develop deeper marketer relationships or offer services at lower prices. Increased competition may result in reduced pricing for our platform and services, increased sales and marketing expense, longer sales cycles or a decrease of our market share, any of which could negatively affect our revenue and future operating results and our ability to grow our business. These companies may also have greater brand recognition and longer histories than we have and may actively seek to serve our market and have the power to significantly change the nature of the marketplace to their advantage. Some of our larger competitors, particularly those that are divisions of large companies, have substantially broader product offerings and may leverage their relationships based on other products or incorporate functionality into existing products to gain business in a manner that may discourage customers from using our platform and services, including through selling at zero or negative margins or product bundling with other services they provide at reduced prices. Customers may prefer to purchase advertising from social medial platforms or other closed platforms, which they cannot acquire through our platform. Potential customers may also prefer to purchase from their existing platform rather than a new platform regardless of product performance or features. Larger competitors often have broader product lines and market focus than us and may therefore not be as susceptible to downturns in a particular market. We may also experience negative market perception as a result of being a smaller company than our larger competitors.

In addition, we derive a significant portion of our revenue from advertising in the desktop, tablet, mobile and CTV channels, which are rapidly evolving, highly competitive, complex and fragmented. We face significant competition in these markets which we expect will intensify in the future.

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Our future success depends on the continuing efforts of our key employees and our ability to attract, hire, retain and motivate highly skilled employees in the future.

Our future success depends on the continuing efforts of our executive officers and other key employees. We rely on the leadership, knowledge and experience that our executive officers provide. They foster our corporate culture, which has been instrumental to its ability to attract and retain new talent. We also rely on employees in our engineering, technical, product development, support and sales teams to attract and retain key customers.

The market for talent in our key areas of operations is intensely competitive, which could increase our costs to attract and retain talented employees. 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, and we may lose new employees to our competitors or other companies before we realize the benefit of our investment in recruiting and training them. We have at times experienced employee turnover. Because of the complexity of our platform and service offerings, new employees often require significant training and, in many cases, take significant time before they achieve full productivity. Our account managers, for instance, need to be trained quickly on the features of our platform since failure to offer high-quality support may adversely affect our relationships with its customers.

Employee turnover, including changes in our management team, could disrupt our business. Our key employees, other than James Lawson, its Chief Executive Officer, do not have employment agreements for specific terms, and any of such employees may terminate his or her employment with us at any time. The loss of one or more of our executive officers or our inability to attract and retain highly skilled employees could have an adverse effect on our business, operating results and financial condition.

Failure to manage our growth effectively could cause our business to suffer and have an adverse effect on our business, operating results and financial condition.

We have experienced significant growth since inception. To manage our growth effectively, we must continually evaluate and evolve our organization. We must also manage our employees, operations, finances, technology and development and capital investments efficiently. Our efficiency, productivity and the quality of our platform, service offerings and customer service may be adversely impacted if we do not train our new personnel, particularly our sales and support personnel, quickly and effectively, or if we fail to appropriately coordinate across our organization. Additionally, our rapid growth may place a strain on our resources, infrastructure and ability to maintain and improve the quality of our platform and services. You should not consider our revenue growth and levels of profitability in recent periods as indicative of future performance. In future periods, our revenue or profitability could decline or grow more slowly than we expect. Failure to manage our growth effectively could cause our business to suffer and have an adverse effect on our operating results and financial condition.

Seasonal fluctuations in advertising activity could have a material impact on our revenue, cash flow and operating results.

Our revenue, cash flow, operating results and other key operating and performance metrics may vary from quarter to quarter due to the seasonal nature of our customers’ spending on advertising campaigns. For example, in prior years, customers tended to devote more of their advertising budgets to the fourth calendar quarter to coincide with consumer holiday spending. In contrast, the first quarter of the calendar year has typically been the slowest in terms of advertising spend.

Future acquisitions, strategic investments or alliances could disrupt our business and harm our business, operating results and financial condition.

To the extent we find suitable and attractive acquisition candidates and business opportunities in the future, we may acquire other complementary businesses, products and technologies and enter into joint ventures or

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similar strategic relationships. We have no present commitments or agreements to enter into any such acquisitions or make any such investments. However, if we identify an appropriate acquisition candidate, we may not be successful in negotiating the terms or financing of the acquisition, and our due diligence may fail to identify all of the problems, liabilities or other shortcomings or challenges of an acquired business, product or technology, including issues related to intellectual property, product quality or architecture, regulatory compliance practices, revenue recognition or other accounting practices, tax liabilities, privacy or cybersecurity issues or employee or customer issues. There is no certainty that we will be able to integrate successfully the services, products and personnel of any acquired business into our operations. In addition, any future acquisitions, joint ventures or similar relationships may cause a disruption in our ongoing business and distract our management. Further, we may be unable to realize the revenue improvements, cost savings and other intended benefits of any such transaction. Acquisitions involve numerous other risks, any of which could harm our business, including:

Failure to appropriately mitigate these risks or other issues related to such strategic investments and acquisitions could result in reducing or completely eliminating any anticipated benefits of such transactions, and harm AdTheorent’s business generally. Future acquisitions could also result in dilutive issuances of AdTheorent’s or the Post-Combination Company’s equity securities, the incurrence of debt, contingent liabilities, amortization expenses or the impairment of goodwill, any of which could harm AdTheorent’s business, operating results and financial condition.

Our management team has limited experience managing a public company.

Most members of our management team have limited or no experience managing a publicly- traded company, interacting with public company investors, and complying with the increasingly complex laws, rules and regulations that govern public companies. There are significant obligations we will be subject to relating to reporting, procedures and internal controls, and our management team may not successfully or efficiently manage our transition to being a public company. These new obligations and added scrutiny will require significant attention from our management and could divert their attention away from the day-to-day management of our business, which could adversely affect our business, operating results and financial condition.

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Our corporate culture has contributed to our success and, if we are unable to maintain it as we grow, our business, operating results and financial condition could be harmed.

We have experienced and may continue to experience rapid expansion of its employee ranks. We believe that our corporate culture has been critical to our success and we have invested substantial time and resources in building our team within our company culture. However, as our organization grows, it may be difficult to maintain our culture, which could reduce our ability to innovate and operate effectively and proactively focus on and pursue our corporate objectives. The failure to maintain the key aspects of our culture as our organization grows could result in decreased employee satisfaction, increased difficulty in attracting top talent, increased turnover and degraded quality of customer service, all of which are important to our success and to the effective execution of our business strategy. In the event we are unable to maintain our corporate culture as we grow to scale, our business, operating results and financial condition could be harmed.

We rely on agreements with third parties to finance our business. We may not be able to secure additional financing on favorable terms, or at all, to meet our future capital needs, which may in turn impair our growth.

We intend to continue to grow our business, which may require additional capital to develop new features or enhance our platform, improve our operating infrastructure, finance working capital requirements or acquire complementary businesses and technologies. Accordingly, we may need to engage in additional equity or debt financings to secure additional capital. If we raise additional funds through future issuances of equity or convertible debt securities, our existing stockholders could suffer significant dilution, 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, which may make it more difficult for us to obtain additional capital and to pursue business opportunities. If we are unable to secure additional funding on favorable terms, or at all, when we require, our ability to continue to grow our business to react to market conditions could be impaired and our business may be harmed.

We may utilize a significant amount of indebtedness in the operation of our business, and our cash flows and operating results could be adversely affected by required payments of any debt or related interest and other risks of any debt financing.

We may incur indebtedness subject to covenants that limit our ability and our subsidiaries’ ability to, among other things, incur indebtedness, create liens, make investments, merge with other companies, dispose of its assets, prepay other indebtedness and make dividends and other distributions. The terms of these agreements may restrict our current and future operations and could adversely affect our ability to finance our future operations or capital needs or to execute business strategies in the means or manner desired. In addition, complying with these covenants may make it more difficult for us to successfully execute our business strategy, invest in our growth strategy and compete against companies who are not subject to such restrictions.

If we are unable to comply with any payment requirements, our lenders may accelerate obligations under their loan agreements and foreclose upon the collateral, or we may be forced to sell assets, restructure any indebtedness or seek additional equity capital, which would dilute our stockholders’ interests. If we fail to comply with our covenants under the loan agreements, it could result in an event of default under the agreements and our lenders could make the entire debt immediately due and payable. If this occurs, we might not be able to repay any debt or borrow sufficient funds to refinance it. Even if new financing is available, it may not be on terms that are acceptable to us.

Interest rates under our loan agreements are based partly on SOFR, the Secured Overnight Financing Rate. Interest rates under any other loan or commercial agreements (if any) may be based partly on LIBOR, the London interbank offered rate, which is the basic rate of interest used in lending between banks on the London interbank market and is widely used as a reference for setting the interest rate on loans globally. On March 5,

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2021, the authority that regulates LIBOR announced that it intends to stop compelling banks to submit rates for the calculation of one, three and six month LIBOR after June 30, 2023. It is unclear whether new methods of calculating such LIBOR periods will be established such that they continue to exist after June 30, 2023. It is not possible to predict the effect of these changes, other reforms or the establishment of alternative reference rates in the United States or elsewhere. If the method for calculation of LIBOR changes, if LIBOR is no longer available, or if lenders have increased costs due to changes in LIBOR, we may suffer from potential increases in interest rates on our borrowings. Further, we may need to renegotiate our loan agreements or any other agreements that utilize LIBOR as a factor in determining the interest rate to replace LIBOR with the new standard that is established.

RISKS RELATED TO THE OWNERSHIP OF OUR COMMON STOCK

The market price of our Common Stock may be volatile or may decline regardless of our operating performance, and you may not be able to resell your shares at or above the price you paid for such shares.

The market price of equity securities of technology companies has historically experienced high levels of volatility. If you purchase shares of our Common Stock, you may not be able to resell those shares at or above the price which you paid for such shares. The market price of our Common Stock may fluctuate significantly in response to numerous factors, some of which are beyond our control and may not be related to our operating performance, including:

In addition, if the stock market for technology companies, or the stock market generally, experiences a loss of investor confidence, the trading price of our Common Stock could decline for reasons unrelated to our business, operating results or financial condition. Stock prices of many technology companies have fluctuated in a manner unrelated or disproportionate to the operating performance of those companies. 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, stockholders have filed securities class action litigation following periods of market volatility.

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If we were to become involved in securities litigation, it could subject us to substantial costs, divert resources and the attention of management from the business, and adversely affect the business.

Sales of substantial blocks of our Common Stock into the public market after this offering, including when “lock-up” or “market standoff” periods end, or the perception that such sales might occur, could cause the market price of our Common Stock to decline.

Sales of substantial blocks of our Common Stock into the public market, including when “lock-up” or “market standoff” periods end, or the perception that such sales might occur, could cause the market price of our Common Stock to decline and may make it more difficult for you to sell your Common Stock at a time and price that you deem appropriate. As of December 22, 2021, we have approximately 85,743,994 shares of our Common Stock outstanding.

Certain holders of our capital stock and securities convertible into, or exchangeable for, our capital stock have agreed not to offer, sell or agree to sell, directly or indirectly, any shares of Common Stock for a period of 180 days from the date of the Business Combination. The Sponsor has agreed not to transfer, assign or sell any of the Common Stock issued upon conversion of its Founder Shares until the earlier to occur of: (i) one year after the completion of the Business Combination or (ii) the date on which the Company completes a liquidation, merger, capital stock exchange or similar transaction that results in the Company’s stockholders having the right to exchange their shares of Common Stock for cash, securities or other property. Notwithstanding the foregoing, if the last reported sale price of the Company’s Common Stock equals or exceeds $12.00 per share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 150 days after the Business Combination, the Common Stock will be released from the lock-up. When the applicable lock-up period expires, the locked-up equity-holders will be able to sell shares into the public market.

We intend to register the offer and sale of all shares of Common Stock that we may issue under our equity compensation plans.

Insiders have substantial control over our company, which could limit your ability to influence the outcome of key decisions, including a change of control.

H.I.G. Capital, LLC (“H.I.G. Capital”) controls more than 30% of the voting power of our Common Stock in the election of directors. This control will limit or preclude your ability to influence corporate matters for the foreseeable future. These stockholders will be able to influence or control matters requiring approval by our stockholders, including the election of directors and the approval of mergers, acquisitions or other extraordinary transactions. Their interests may differ from yours and they may vote in a manner that is adverse to your interests. This control may deter, delay or prevent a change of control of our company, deprive our stockholders of an opportunity to receive a premium for their Common Stock as part of a sale of our Company and may ultimately affect the market price of our Common Stock.

We do not intend to pay dividends for the foreseeable future and, as a result, your ability to achieve a return on your investment will depend on appreciation in the price of our Common Stock.

We do not intend to pay any cash dividends in the foreseeable future. We anticipate that we will retain all of our future earnings for use in the development of the business and for general corporate purposes. Any determination to pay dividends in the future will be at the discretion of our board of directors (the “Board”) and the terms of our debt arrangements, if any. Accordingly, investors must rely on sales of their Common Stock after price appreciation, which may never occur, as the only way to realize any future gains on their investments.

The requirements of being a public company may strain our resources, divert our management’s attention and affect our ability to attract and retain qualified board members.

We have recently become a public company, and as such, we are subject to the reporting requirements of the Exchange Act, and are required to comply with the applicable requirements of the Sarbanes-Oxley Act and the

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Dodd-Frank Wall Street Reform and Consumer Protection Act, the listing requirements of the Nasdaq Global Market, and other applicable securities rules and regulations. Compliance with these rules and regulations has increased our legal and financial compliance costs, made some activities more difficult, time-consuming or costly and increased demand on systems and resources. Among other things, the Exchange Act requires that we file annual, quarterly and current reports with respect to our business and operating results and maintain effective disclosure controls and procedures and internal controls over financial reporting. Significant resources and management oversight will be required to maintain and, if required, improve our disclosure controls and procedures and internal controls over financial reporting to meet this standard. As a result, management’s attention may be diverted from other business concerns, which could harm our business and operating results. Although we have already hired additional employees to comply with these requirements, we may need to hire even more employees in the future, which will increase our costs and expenses.

We also expect that being a public company and these new rules and regulations will make it more expensive for us to obtain director and officer liability insurance, and we may be required to accept reduced coverage or incur substantially higher costs to obtain coverage. These factors could also make it more difficult for us to attract and retain qualified members of our Board, particularly to serve on our audit committee and compensation committee, and qualified executive officers.

Reduced reporting and disclosure requirements applicable to emerging growth companies could make our Common Stock less attractive to investors.

We are an emerging growth company (“EGC”) and, for as long as we continue to be an EGC, we may choose to continue to take advantage of exemptions from various reporting requirements applicable to other public companies. Consequently, we are not required to have our independent registered public accounting firm audit our internal control over financial reporting under Section 404 of the Sarbanes-Oxley Act, and we are subject to reduced disclosure obligations regarding executive compensation in our periodic reports and proxy statements and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and stockholder approval of any golden parachute payments not previously approved. In addition, the JOBS Act provides that an EGC can take advantage of an extended transition period for complying with new or revised accounting standards. We have elected to take advantage of the extended transition period. As a result, our financial statements may not be comparable to companies that comply with new or revised accounting pronouncements as of the dates such pronouncements are effective for public companies.

We could be an EGC for up to five years following the completion of MCAP’s initial public offering. We will cease to be an EGC upon the earliest of: (i) the end of the fiscal year following the fifth anniversary of MCAP’s initial public offering, (ii) the first fiscal year after our annual gross revenue is $1.07 billion or more, (iii) the date on which we have, during the previous three-year period, issued more than $1 billion in nonconvertible debt securities or (iv) the end of any fiscal year in which the market value of our Common Stock held by non-affiliates exceeded $700 million as of the end of the second quarter of that fiscal year. We cannot predict whether investors will find our Common Stock less attractive if the company chooses to rely on these exemptions. If some investors find our Common Stock less attractive as a result of any choices to reduce future disclosure, there may be a less active trading market for our Common Stock, and the price of our Common Stock may be more volatile.

If we fail to maintain or implement effective internal controls, we may not be able to report financial results accurately or on a timely basis, or to detect fraud, which could have a material adverse effect on our business and the per share price of our Common Stock.

The Sarbanes-Oxley Act requires, among other things, that we maintain effective disclosure controls and procedures, and internal control over financial reporting. We are continuing to develop and refine our disclosure controls and other procedures that are designed to ensure that information required to be disclosed in the reports that we will file with the SEC is recorded, processed, summarized and reported within the time periods specified

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in SEC rules and forms. We are also continuing to improve our internal control over financial reporting. We have expended, and anticipate that we will continue to expend, significant resources in order to maintain and improve the effectiveness of our disclosure controls and procedures and internal control over financial reporting.

Our current controls and any new controls that we develop may become inadequate because of changes in conditions in our business.

Further, weaknesses in our disclosure controls or our internal control over financial reporting may be discovered in the future. Any failure to develop or maintain effective controls, or any difficulties encountered in our implementation or improvement, could harm our operating results or cause us to fail to meet our reporting obligations and may result in a restatement of our financial statements for prior periods. Any failure to implement and maintain effective internal control over financial reporting could also adversely affect the results of management reports and independent registered public accounting firm audits of our internal control over financial reporting that we will eventually be required to include in our periodic reports that will be filed with the SEC. Ineffective disclosure controls and procedures, and internal control over financial reporting could also cause investors to lose confidence in our reported financial and other information, which would likely have a negative effect on the market price of our Common Stock. In addition, if we are unable to continue to meet these requirements, we may not be able to remain listed on the NASDAQ.

We are not currently required to comply with the SEC rules that implement Section 404 of the Sarbanes-Oxley Act, and are therefore not required to make a formal assessment of the effectiveness of our internal control over financial reporting for that purpose. We will be required to provide an annual management report on the effectiveness of our internal control over financial reporting commencing with our second annual report on Form 10-K. Our independent registered public accounting firm is not required to audit the effectiveness of its internal control over financial reporting until after we are no longer an “emerging growth company,” as defined in the JOBS Act. At such time, our independent registered public accounting firm may issue a report that is adverse in the event it is not satisfied with the level at which our internal control over financial reporting is documented, designed or operating.

Any failure to maintain effective disclosure controls and internal control over financial reporting could have a material and adverse effect on our business and operating results, and cause a decline in the market price of our Common Stock.

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

The trading market for our Common Stock will partially depend on the research and reports that securities or industry analysts publish about us or our business. We do not have any control over these analysts. If one or more of the analysts who cover us should downgrade our shares or change their opinion of our business prospects, our share price would likely decline. If one or more of these analysts ceases coverage of our company or fails to regularly publish reports on us, we could lose visibility in the financial markets, which could cause our share price or trading volume to decline. The market value of our securities at the time of the Business Combination may vary significantly from their prices on the date the Business Combination Agreement was executed, the date of the proxy statement/prospectus, or the date on which our stockholders vote on the business combination proposal and the other proposals presented to them.

Our charter documents and Delaware law could discourage takeover attempts and other corporate governance changes.

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

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In addition, as a Delaware corporation, we are subject to Section 203 of the Delaware General Corporation Law. These provisions may prohibit large stockholders, in particular those owning 15% or more of our outstanding voting stock, from merging or combining with us for a period of time. In addition, debt instruments we may enter into in the future may include provisions entitling the lenders to demand immediate repayment of all borrowings upon the occurrence of certain change of control events relating to us, which also could discourage, delay or prevent a business combination transaction.

Our Certificate of Incorporation includes an exclusive forum clause, which could limit our stockholders’ ability to obtain a favorable judicial forum for disputes with us.

Our certificate of incorporation provides that, unless we consent in writing to the selection of an alternative forum, the Court of Chancery of the State of Delaware (or, in the event that the Chancery Court does not have jurisdiction, the federal district court for the District of Delaware or other state courts of the State of Delaware) will, to the fullest extent permitted by applicable law, be the sole and exclusive forum for (i) any derivative action or proceeding brought on behalf of us, (ii) any action asserting a breach of a fiduciary duty owed by any of our directors, officers or stockholders to us or to our stockholders, (iii) any action arising under our certificate of incorporation, our Bylaws or the DGCL or (iv) any action asserting a claim against us governed by the internal affairs doctrine. In addition, our certificate of incorporation designates the federal district courts of the United States of America as the exclusive forum for the resolution of any complaint asserting a cause of action arising under the Securities Act. Any person or entity purchasing or otherwise acquiring any interest in shares of our capital stock will be deemed to have notice of and consented to the exclusive forum provisions in our certificate of incorporation.

Section 27 of the Exchange Act creates exclusive federal jurisdiction over all suits brought to enforce any duty or liability created by the Exchange Act or the rules and regulations thereunder. As a result, the exclusive forum provision in our certificate of incorporation will not apply to suits brought to enforce any duty or liability created by the Exchange Act or any other claim for which the federal courts have exclusive jurisdiction.

These choice of forum provisions may limit a stockholder’s ability to bring a claim in other judicial forums for disputes with us or our directors, officers or other employees, which may discourage lawsuits against us and our directors, officers and other employees in jurisdictions other than Delaware, or federal courts, as applicable. Alternatively, if a court were to find the choice of forum provision contained in our certificate of incorporation to be inapplicable or unenforceable in an action, we may incur additional costs associated with resolving such action in other jurisdictions, which could have a material adverse effect on our business, financial condition or results of operations.

The foregoing provisions may limit our stockholders’ ability to obtain a favorable judicial forum for disputes with us.

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USE OF PROCEEDS

All of the Common Stock and Warrants offered by the Selling Securityholders pursuant to this prospectus will be sold by the Selling Securityholders for their respective accounts. We will not receive any of the proceeds from these sales.

We will receive up to an aggregate of approximately $183.7 million from the exercise of the Warrants, assuming the exercise in full of all of the Warrants for cash. We expect to use the net proceeds from the exercise of the Warrants for general corporate purposes. We will have broad discretion over the use of proceeds from the exercise of the Warrants. There is no assurance that the holders of the Warrants will elect to exercise any or all of such Warrants. To the extent that the Warrants are exercised on a “cashless basis,” the amount of cash we would receive from the exercise of the Warrants will decrease.

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DETERMINATION OF OFFERING PRICE

The offering price of the shares of Common Stock underlying the Warrants offered hereby is determined by reference to the exercise price of the Warrants of $11.50 per share. The Public Warrants are listed on the NASDAQ under the symbol “ADTHW.”

We cannot currently determine the price or prices at which shares of our Common Stock or Warrants may be sold by the Selling Securityholders under this prospectus.

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MARKET INFORMATION FOR COMMON STOCK AND DIVIDEND POLICY

Market Information

Our Common Stock and Public Warrants are currently listed on the NASDAQ under the symbols “ADTH” and “ADTHW,” respectively. Prior to the consummation of the Business Combination, MCAP’s units, common stock and warrants were listed on the NASDAQ under the symbols “MACQU,” “MACQ” and “MACQW,” respectively. As of December 22, 2021 following the completion of the Business Combination, there were 27 holders of record of our Common Stock, which amount does not include participants of The Depository Trust Company or beneficial owners holding shares through nominee names. We currently do not intend to list the Private Warrants offered hereby on any stock exchange or stock market.

Dividend Policy

We have not paid any cash dividends on our Common Stock to date. We may retain future earnings, if any, for future operations, expansion and debt repayment and has no current plans to pay cash dividends for the foreseeable future. Any decision to declare and pay dividends in the future will be made at the discretion of the Board and will depend on, among other things, our results of operations, financial condition, cash requirements, contractual restrictions and other factors that the Board may deem relevant. In addition, our ability to pay dividends may be limited by covenants of any existing and future outstanding indebtedness we or our subsidiaries incur. We do not anticipate declaring any cash dividends to holders of the Common Stock in the foreseeable future.

Securities Authorized for Issuance under Equity Compensation Plans

As of December 31, 2021, there were up to approximately 10,131,638 shares of Common Stock initially authorized for issuance under our 2021 Long-Term Incentive Plan (the “2021 Long-Term Plan”) and 2,026,328 shares of Common Stock initially authorized for issuance under our Employee Stock Purchase Plan (the “2021 ESPP”), each of which our stockholders approved on December 21, 2021 in connection with the Business Combination and became effective immediately upon the Closing.

We intend to file one or more registration statements on Form S-8 under the Securities Act to register the shares of Common Stock issued or issuable under the 2021 Long-Term Plan, the 2021 ESPP and any assumed Legacy AdTheorent options or other awards. Any such Form S-8 registration statement will become effective automatically upon filing. We expect that the initial registration statement on Form S-8 will cover shares of Common Stock underlying the 2021 Long-Term Plan, the 2021 ESPP and any assumed Legacy AdTheorent options or other awards. Once these shares are registered, they can be sold in the public market upon issuance, subject to applicable restrictions.

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SELECTED HISTORICAL FINANCIAL INFORMATION

MCAP’s balance sheet data as of December 31, 2020 and statement of operations data for the period from November 12, 2020 (inception) through December 31, 2020 are derived from MCAP’s audited financial statements, included elsewhere in this prospectus. The selected historical interim financial information of MCAP as of September 30, 2021 and for the nine months ended September 30, 2021 was derived from the unaudited interim financial statements of MCAP included elsewhere in this prospectus.

Legacy AdTheorent’s consolidated balance sheet data as of December 30, 2020 and December 31, 2019, consolidated statement of operations data and consolidated statement of cash flow data for the fiscal years ended December 31, 2020 and December 31, 2019 are derived from Legacy AdTheorent’s audited financial statements, included elsewhere in this prospectus. The selected historical interim financial information of Legacy AdTheorent as of September 30, 2021 and September 30, 2020 and for the nine months ended September 30, 2021 and 2020 are derived from the unaudited condensed consolidated interim financial statements of Legacy AdTheorent included elsewhere in this prospectus.

This information is only a summary and should be read in conjunction with each of Legacy AdTheorent’s and MCAP’s consolidated financial statements and related notes and the sections entitled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included elsewhere in this prospectus. The historical results included below and elsewhere in this prospectus are not indicative of the future performance of the Company. All amounts are in U.S. dollars.

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MCAP’s Selected Financial Information

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Legacy AdTheorent’s Selected Financial Information

Consolidated Statements of Operations Data:

Consolidated Balance Sheet Data:

Other Key Operating and Financial Performance Metrics

We calculate and monitor certain non-GAAP financial measures to help set budgets, establish operational goals, analyze financial results and performance, and make strategic decisions. We also believe that the presentation of these non-GAAP financial measures in this proxy statement/prospectus provides an additional tool for investors to use in comparing our results of operations over multiple periods. However, the non- GAAP financial measures presented in this proxy statement/prospectus may not be comparable to similarly titled measures reported by other companies due to differences in the way that these measures are calculated. The non-GAAP financial measures presented should not be considered as the sole measure of our performance, and should not be considered insolation from, or a substitute for, comparable financial measures calculated in accordance with generally with accepted accounting principles in the United States (“GAAP”).

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The information in the table below sets forth the non-GAAP financial measures that we use in this proxy statement/prospectus. Because of the limitations associated with these non-GAAP financial measures, “Adjusted Gross Profit,” “EBITDA,” “Adjusted EBITDA,” “Adjusted Gross Profit as a % of Revenue” and “Adjusted EBITDA as a percent of Adjusted Gross Profit” should not be considered in isolation or as a substitute for performance measures calculated in accordance with GAAP. We compensate for these limitations by relying primarily on our GAAP results and using non-GAAP measures on a supplemental basis. You should review the reconciliation of the non-GAAP financial measures below and not rely on any single financial measure to evaluate our business.

Adjusted Gross Profit

Adjusted Gross Profit is a non-GAAP profitability measure. Adjusted Gross Profit is a non-GAAP financial measure of campaign profitability, monitored by management and the board, used to evaluate our operating performance and trends, develop short and long term operational plans, and make strategic decisions regarding the allocation of capital. We believe this measure provides a useful period to period comparison of campaign profitability and is useful information to investors and the market in understanding and evaluating our operating results in the same manner as our management and board. Gross profit is the most comparable GAAP measurement, which is calculated as revenue less platform operations costs. In calculating Adjusted Gross Profit, we add back other platform operations costs, which consist of amortization expense related to capitalized software, depreciation expense, allocated costs of personnel which set up and monitor campaign performance, and platform hosting, license, and maintenance costs, to gross profit.

The following table presents the calculation of gross profit and reconciliation of gross profit to Adjusted Gross Profit for the years ended December 31, 2020 and 2019, and the nine months ended September 30, 2021 and 2020.

EBITDA and Adjusted EBITDA

EBITDA is a non-GAAP financial measure defined by us as net income (loss), before interest expense, net, depreciation, amortization and income tax expense. Adjusted EBITDA is defined as EBITDA before stock compensation expense, transaction costs, management fees, non-core operations and other potential non-recurring items.

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Collectively, these non-GAAP financial measures are key profitability measures used by our management and board to understand and evaluate our operating performance and trends, develop short-and long-term operational plans and make strategic decisions regarding the allocation of capital. We believe that these measures can provide useful period-to-period comparisons of campaign profitability. Accordingly, we believe that these measures provide useful information to investors and the market in understanding and evaluating our operating results in the same manner as our management and the Board.

Adjusted EBITDA as a Percentage of Adjusted Gross Profit and Adjusted Gross Profit as a Percentage of Revenue

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UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

Introduction

The following unaudited pro forma condensed combined financial information has been prepared in accordance with Article 11 of Regulation S-X as amended by the final rule, Release No. 33-10786 “Amendments to Financial Disclosures about Acquired and Disposed Businesses.” MCAP and AdTheorent are collectively referred to herein as the “Companies,” and the Companies, subsequent to the Business Combination, are referred to herein as the Post-Combination Company. The following unaudited pro forma condensed combined balance sheet as of September 30, 2021 and the unaudited pro forma condensed combined statements of operations for the nine months ended September 30, 2021 and for the year ended December 31, 2020 present the combination of the financial information of MCAP and AdTheorent after giving effect to the Business Combination and related adjustments described in the accompanying notes.

The unaudited pro forma condensed combined statements of operations for the nine months ended September 30, 2021 and for the year ended December 31, 2020 give pro forma effect to the Business Combination as if it had occurred on January 1, 2020. The unaudited pro forma condensed combined balance sheet as of September 30, 2021 gives pro forma effect to the Business Combination as if it was completed on September 30, 2021.

The unaudited pro forma condensed combined financial information is based on and should be read in conjunction with:

Accounting for the Business Combination

The Business Combination will be accounted for as a reverse recapitalization, in accordance with GAAP. Under the guidance in Accounting Standard Codification (“ASC”) 805, MCAP is expected to be treated as the “acquired” company for financial reporting purposes. Accordingly, the Business Combination will be treated as the equivalent of AdTheorent issuing stock for the net assets of MCAP, accompanied by a recapitalization whereby the net assets of MCAP will be stated at historical cost and no goodwill or other intangible assets are recorded. Operations prior to the Business Combination will be those of AdTheorent.

AdTheorent was determined to be the accounting acquirer based on evaluation of the following facts and circumstances:

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The unaudited pro forma condensed combined financial information is for informational purposes only. They do not purport to indicate the results that would have been obtained had the Business Combination and related transactions been consummated on the assumed date or for the periods presented, or which may be realized in the future. The transaction accounting adjustments are based on the information currently available and the assumptions and estimates underlying the transaction accounting adjustments are described in the accompanying notes. Actual results may differ materially from the assumptions within the accompanying unaudited pro forma condensed combined financial information. The Post-Combination Company will incur additional costs after the Business Combination in order to satisfy its obligations as an SEC reporting public company.

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PRO FORMA CONDENSED COMBINED BALANCE SHEET

AS OF SEPTEMBER 30, 2021

(UNAUDITED)

(in thousands, except for number of shares)

The accompanying notes are an integral part of these unaudited pro forma condensed combined financial statements.

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PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS

FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2021

(UNAUDITED)

(in thousands, except for per share amounts)

The accompanying notes are an integral part of these unaudited pro forma condensed combined financial statements.

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PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS

FOR THE YEAR ENDED DECEMBER 31, 2020

(UNAUDITED)

(in thousands, except for per share amounts)