United States securities and exchange commission logo





                             September 23, 2021

       Theodore L. Koenig
       Chairman and Chief Executive Officer
       MCAP Acquisition Corporation
       311 South Wacker Drive, Suite 6400
       Chicago, Illinois 60606

                                                        Re: MCAP Acquisition
Corporation
                                                            Registration
Statement on Form S-4
                                                            Filed August 24,
2021
                                                            File No. 333-259027

       Dear Mr. Koenig:

              We have reviewed your registration statement and have the
following comments. In
       some of our comments, we may ask you to provide us with information so
we may better
       understand your disclosure.

              Please respond to this letter by amending your registration
statement and providing the
       requested information. If you do not believe our comments apply to your
facts and
       circumstances or do not believe an amendment is appropriate, please tell
us why in your
       response.

              After reviewing any amendment to your registration statement and
the information you
       provide in response to these comments, we may have additional comments.

       Form S-4 filed August 24, 2021

       Cover Page

   1.                                                   You indicate in the
forepart of the proxy statement/prospectus that the business
                                                        combination transaction
will consist of four different mergers. Rather than focus on the
                                                        mechanics of the
business combination transaction, please explain its purpose and effect.
                                                        Similarly, please
explain in plain English the type, amount and value of the transaction
                                                        consideration and the
reasons for the adjustments to the cash consideration.
       Summary of the Proxy Statement/Prospectus
       Proposal No. 1: The Business Combination Proposal, page 5

   2.                                                   In light of the number
of mergers and parties to the business combination agreement,
                                                        please provide diagrams
depicting the organizational structure of MCAP and
 Theodore L. Koenig
MCAP Acquisition Corporation
September 23, 2021
Page 2
         AdTheorent before and after the business combination. Include in the
post-combination
         organization diagram of MCAP the percentage ownership of each material
group of
         shareholders assuming both no redemptions and maximum redemptions.
3.       Please summarize the Member Support Agreement and the Sponsor Support
Agreement.
4.       Please discuss the conditions to the business combination that there
be Aggregate Cash
         Consideration of at least $140 million and Available Cash of $258.125.
Consider
         providing a table showing the sources and uses of funding for the
business
         combination assuming no redemptions and maximum redemptions.
5.       Disclose if MCAP's Sponsor, directors, officers or their affiliates
will participate in the
         PIPE investment.
Questions and Answers About the Business Combination
What vote is required to approve the Stockholder Proposals?, page 13

6.       In light of the vote requirement for approval of the proposals, please
discuss how the
         voting requirement and the various agreements for the Sponsor,
executive officers and
         directors of MCAP, as well as certain investors who purchased 4.1
million MCAP units in
         the MCAP IPO, to vote in favor of the business combination make it
more likely that the
         business combination will be approved. For example, disclose the
amount and percentage
         of shares not subject to these voting agreements that would be
required to approve the
         business combination proposal if all MCAP shares are present or only a
quorum of
         MCAP shares are present.
What equity stake will current MCAP stockholders and AdTheorent Stockholders
have in the
Post-Combination Company after the Closing?, page 14

7.     Please revise to disclose all possible sources and extent of dilution
that shareholders who
       elect not to redeem their shares may experience in connection with the
business
       combination. Provide disclosure of the impact of each significant source
of dilution,
       including the amount of equity held by founders and convertible
securities, such as
       warrants retained by redeeming shareholders, at each of the redemption
levels detailed in
       your sensitivity analysis, including any needed assumptions. If you
present a maximum
       redemption scenario here based on the maximum number of redemptions that
may occur
       without a shortfall of cash while still satisfying the conditions to the
Business
       Combination, please explain why this is appropriate when there are no
limitations on the
       maximum
FirstName          number of redemptions.
           LastNameTheodore      L. Koenig Explain whether the conditions that
define the
       maximum
Comapany           redemption
            NameMCAP           level can
                          Acquisition    be waived or satisfied in another
manner.
                                       Corporation
8.     Please
September  23,separately
               2021 Pagedisclose
                           2       the equity ownership to be held by H.I.G.
FirstName LastName
 Theodore L. Koenig
FirstName LastNameTheodore
MCAP Acquisition  CorporationL. Koenig
Comapany 23,
September NameMCAP
              2021     Acquisition Corporation
September
Page 3    23, 2021 Page 3
FirstName LastName
Summary Historical Consolidated Financial Information of AdTheorent
Other Key Operating and Financial Performance Metrics, page 26

9.       Your presentation of Revenue less Traffic Acquisition Costs (TAC)
excludes certain costs
         incurred to execute customer campaigns. This measure appears to
substitute individually
         tailored revenue recognition methods for those of GAAP and does not
comply with
         Question 100.04 of the Non-GAAP C&DIs and Rule 100(b) of Regulation G.
Please
         revise. To the extent you choose to provide a non-GAAP contribution
margin measure
         instead, ensure that you reconcile such measure to GAAP gross profit
and do not refer to it
         as a "revenue" non-GAAP measure. Also, ensure that you present the
comparable GAAP
         measure with equal or greater prominence wherever you present such
measure. Similar
         revisions should be made to your Revenue less TAC as a percentage of
revenue measure.
Risks Related to AdTheorent's Business
AdTheorent may have long sales cycles..., page 41

10.      Please disclose the average length of AdTheorent   s sales cycle.
Our Proposed Certificate of Incorporation will provide..., page 73

11.      Please reconcile your exclusive forum provision disclosures on pages
57 and 73.
         Specifically, please clarify which provision will be included in the
Post-Combination
         Company's certificate of incorporation.
MCAP may face litigation and other risks as a result of the material weakness
in its internal
control over financial reporting..., page 74

12.      You refer here to MCAP's material weakness in internal control over
financial reporting.
         Further, we note from MCAP's March 31, 2021 Form 10-Q that management
identified a
         material weakness in internal controls over financial reporting
related to the accounting
         for warrants issued in connection with the company's initial public
offering, which also
         resulted in ineffective disclosure controls and procedures as of the
same date. Please
         include a separate risk factor addressing MCAP's identified material
weakness and discuss
         any remediation efforts taken so far including what remains to be
completed in your
         remediation plan. Also, disclose how long you estimate it will take to
complete your plan
         and any associated material costs that you have incurred or expect to
incur. To the extent
         such weakness has not yet been remediated, please explain how MCAP
concluded that
         their disclosure controls and procedures were effective as of June 30,
2021.
Unaudited Pro Forma Condensed Combined Financial Information, page 77

13.      We note your discussion here of the no redemption and maximum
redemption scenarios.
         Please explain further your statement that the actual results will be
within the parameters
         described in the two scenarios, or revise as necessary. In this
regard, the maximum
         scenario assumes only 13,742,000 shares of Class A ordinary shares are
redeemed when,
 Theodore L. Koenig
FirstName LastNameTheodore
MCAP Acquisition  CorporationL. Koenig
Comapany 23,
September NameMCAP
              2021     Acquisition Corporation
September
Page 4    23, 2021 Page 4
FirstName LastName
         in fact, up to 28,208,093 shares are subject to redemption.
Note 2. Basis of Pro Forma Presentation, page 88

14.      We note that your maximum redemption scenario is based on the maximum
number of
         redemptions that may occur without a shortfall of cash while still
satisfying the conditions
         to the Business Combination. We further note that MCAP has several
alternatives to
         settle the cash shortfall should more than 13,742,000 public shares be
redeemed. Please
         revise the notes to the pro forma financials to show the impact on the
financial
         statements under the various options available to cover the cash
shortfall should more than
         13,742,000 shares be redeemed. Refer to Article 11-02(a)(10) of
Regulation S-X.
Note 3. Adjustments to Unaudited Pro Forma Condensed Combined Financial
Information
Adjustments to Unaudited Pro Forma Condensed Combined Balance Sheet, page 90

15.      Based on the description of pro forma balance sheet adjustments (h)
and (i), it appears that
         the adjustments on the face of your pro forma balance sheet might be
mislabeled. Please
         revise or advise.
16.      Please revise to provide the amounts used to calculate the cash
consideration and excess
         cash paid to existing AdTheorent Members reflected in adjustments (m)
and (n). Also,
         revise Note 1 to provide a quantified breakdown of the aggregate
transaction
         consideration in total and separately for cash and stock
consideration.
Note 5. Earn-out, page 93

17.      We note that the estimated fair values of the earn-out for AdTheorent
equity
         holders, MCAP shares held in escrow, and amounts issuable to holders
of unvested
         employee stock options and units were determined using a Monte Carlo
simulation
         model. Further, you state that such values are subject to change as
additional information
         becomes available and additional analysis are performed. Considering
the amount
         recognized for pro forma purposes is considerably less than the
potential $95.0 million
         earn-out consideration, please revise to include a sensitivity
analysis to show how your
         pro forma financials might be impacted under various simulation and
valuation scenarios.
         Refer to Article 11-02(a)(10) of Regulation S-X.
Proposal No. 1 - the Business Combination Proposal
The Background of the Business Combination, page 98

18.      You provide disclosure about the other potential acquisition targets
considered by MCAP
         and Monroe Capital. Please disclose when you ceased discussions with
the other
         potential targets to focus solely on AdTheorent.
19.      Please expand your disclosure of the parties    negotiations of the
business combination and
         related agreements to discuss the terms and conditions of the final
merger agreement,
         including the Aggregate Cash Consideration and Available Cash
conditions, the
 Theodore L. Koenig
MCAP Acquisition Corporation
September 23, 2021
Page 5
         determination of the final structure of the proposed transaction and
the ultimate amount
         and form of consideration. As part of this discussion, disclose which
party proposed a
         $950 million enterprise value of AdTheorent and why MCAP proposed
reducing that
         value to $775 million.
Certain Historical and Prospective Financial Information Provided to the MCAP
Board, page
105

20.      Please revise to disclose the material assumptions and estimates
underlying the projected
         financial information and the limitations of the projections.
Interests of MCAP's Directors and Officers in the Business Combination, page
108

21.      Please expand the conflicts of interest discussion so that it
highlights and quantifies all
         material interests in the transaction held by the Sponsor and MCAP   s
officers and
         directors and their affiliates. This could include fiduciary or
contractual obligations to
         other entities as well as any interest in, or affiliation with, the
target company. In addition,
         please clarify how the board considered those conflicts in negotiating
and recommending
         the business combination.
Material U.S. Federal Tax Considerations of the Redemption Rights and the
Business
Combination, page 124

22.      You indicate that named counsel is providing an opinion on the legal
conclusions set forth
         in this section. However, it does not appear that counsel has opined
on the material tax
         consequences for holders who exchange their AdTheorent Capital Stock
for MCAP
         Common Stock and Post-Combination Company Warrants in the Business
Combination.
         In this regard, it appears there is uncertainty as to the material tax
consequences and that
         counsel is assuming the material tax consequence at issue -- that the
Business
         Combination will be treated as a "reorganization" within the meaning
of 368(a) of the
         Internal Revenue Code. If there is significant doubt about the tax
consequences of the
         transaction, counsel may issue a    should    or    more likely than
not    opinion to make clear
         that the opinion is subject to a degree of uncertainty. In that event,
the company should
         provide summary and risk factor disclosure setting forth the risks of
uncertain tax
         treatment to investors. For guidance, refer to Sections III.C.3 and
III.C.4 of CF Staff
         Legal Bulleting No. 19.
Information About AdTheorent, page 154

23.    We note you present Adjusted EBITDA on page 155 and EBITDA on page 160
without
       presenting the related GAAP measure of net income with equal or greater
prominence.
FirstName LastNameTheodore L. Koenig
       Further, you discuss the percentage increase in adjusted EBITDA without
providing
Comapany   NameMCAP
       similar disclosuresAcquisition Corporation
                           for the comparable GAAP measure. Please revise.
Refer to Question
       102.10  of the Non-GAAP
September 23, 2021 Page 5          C&DIs and  Item 10(e)(1)(i)(A) of Regulation
S-K.
FirstName LastName
 Theodore L. Koenig
FirstName LastNameTheodore
MCAP Acquisition  CorporationL. Koenig
Comapany 23,
September NameMCAP
              2021     Acquisition Corporation
September
Page 6    23, 2021 Page 6
FirstName LastName
AdTheorent Management's Discussion and Analysis of Financial Condition and
Results of
Operations, page 169

24.      You state that you rely on both attracting new customers and expanding
current
         customers' usage of your platform to sustain and grow your business.
Please tell us what
         measures you use to monitor your ability to retain and grow the usage
of your existing
         customers and to obtain new customers. In this regard, we note you
disclose active
         customers and high-spend clients throughout the filing. You also
disclose that 69% of
         fiscal year 2020 revenue is generated from customers who have been
with you since 2017
         or earlier. If management uses these measures to evaluate your
business and operations,
         please revise to include a quantified discussion of such metrics in
M&DA for each period
         presented. Also, ensure you define how the metric is calculated, how
management uses it,
         and include a discussion of any trends or fluctuations from period to
period, including
         how such metrics impacted your revenue growth for each period
presented. Refer to SEC
         Release No. 33-10751.
25.      We note your discussion of digital advertising impressions, including
that you had over 20
         billion impressions in fiscal year 2020 and that your platform
assigned predictive scores to
         approximately 1 million digital ad impressions per second or 87
billion per day. Please
         revise to address how you track these digital advertising impressions
in order to support
         the figures disclosed. To the extent you rely on this information as a
key performance
         measure to evaluate your business or operations, please also revise to
include appropriate
         disclosures to this effect.
Results of Operations, page 175

26.      While revenue increased only 0.5% between December 31, 2019 and 2020,
we note that
         revenue from COVID-resistant industries increased 30% during this
period. Additionally,
         we note revenue increased 57.8% for the six months ended June 30, 2020
compared to the
         same period in fiscal 2021. In an effort to balance your discussion
regarding fluctuations
         in revenue and to provide more insight into any effect the pandemic
had on revenue,
         please revise to quantify the negative impact that the COVID-19
pandemic had on revenue
         for each period presented. Additionally, clarify whether the
significant increase in
         revenue for the periods ended June 30 was impacted by the pandemic
(e.g., were 2020
         quarterly revenues lower than usual due to COVID) or whether this was
purely organic
         growth. Lastly, please provide quantification of all factors impacting
revenue, both
         positively and negatively, for each period.
Selected Quarterly Results of Operations, page 178

27.      Please revise to explain why you are presenting quarterly data for
only the first two
         quarters of fiscal 2020 and 2021. Alternatively, consider revising to
present quarterly data
         for all periods presented.
 Theodore L. Koenig
FirstName LastNameTheodore
MCAP Acquisition  CorporationL. Koenig
Comapany 23,
September NameMCAP
              2021     Acquisition Corporation
September
Page 7    23, 2021 Page 7
FirstName LastName
Liquidity and Capital Resources
Cash Flow Summary, page 184

28.      You state that AdTheorent's accounts payable are often due on shorter
cycles than its
         accounts receivable, requiring it to remit payments from its own funds
and accept the risk
         of bad debt. Please disclose the typical payment terms of your
customer sales. Also, tell
         us your days sales outstanding and days payable outstanding for each
period presented,
         and consider disclosing such information along with a discussion of
the underlying
         reasons for any significant changes in each measure and the impact on
your liquidity.
         Refer to Item 303(a)(1) of Regulation S-K.
AdTheorent Holding Company, LLC and Subsidiaries Notes to Consolidated
Financial
Statements
3. Revenue Recognition, page F-47

29.      While we note direct access revenue is a new offering and that revenue
is not yet material
         to your financial statements, please tell us how much revenue you
recorded related to this
         revenue stream in each period presented. Further, consider revising to
address whether
         you expect to grow this revenue stream in the future.
General

30.      Please revise to disclose the deadline for submitting shareholder
proposals for inclusion in
         the registrant   s proxy statement and form of proxy for the
registrant   s next annual
         meeting, calculated in the manner provided in Rule 14a-8(e). Please
also revise to disclose
         the date after which notice of a shareholder proposal submitted
outside the processes of
         Rule 14a-8 is considered untimely. Refer to Rules 14a- 5(e)(1) and
(2).
 Theodore L. Koenig
FirstName LastNameTheodore
MCAP Acquisition  CorporationL. Koenig
Comapany 23,
September NameMCAP
              2021     Acquisition Corporation
September
Page 8    23, 2021 Page 8
FirstName LastName
        We remind you that the company and its management are responsible for
the accuracy
and adequacy of their disclosures, notwithstanding any review, comments, action
or absence of
action by the staff.

       Refer to Rules 460 and 461 regarding requests for acceleration. Please
allow adequate
time for us to review any amendment prior to the requested effective date of
the registration
statement.

        You may contact Brittany Ebbertt, Senior Staff Accountant, at
202-551-3572 or Kathleen
Collins, Accounting Branch Chief, at 202-551-3499 if you have questions
regarding comments
on the financial statements and related matters. Please contact Alexandra
Barone, Staff Attorney,
at 202-551-8816 or Kathleen Krebs, Special Counsel, at 202-551-3350 with any
other questions.



                                                            Sincerely,

                                                            Division of
Corporation Finance
                                                            Office of
Technology
cc:      Jonathan Talcott