Description of Organization and Business Operations		2 Months Ended	9 Months Ended
Mar. 02, 2021	Dec. 31, 2020	Sep. 30, 2021
Subsidiary, Sale of Stock [Line Items]
Description of Organization and Business Operations			1. NATURE OF BUSINESS AdTheorent Holding Company LLC (“Holding Co.”) is a Delaware limited liability company and is headquartered in New York City. Holding Co. is the parent of AdTheorent Intermediate Holding Corporation (“Intermediate”), a Delaware corporation. Intermediate is the parent of AdTheorent Acquisition Corporation (“Acquisition”), also a Delaware corporation. Acquisition is the parent company of AdTheorent, Inc. (“AdTheorent”). AdTheorent is the parent of AdTheorent Canada, Inc., a Nova Scotia corporation. These entities collectively are referred to herein as “the Company”, “us” or “our”. AdTheorent generates revenue by using its proprietary machine learning-powered technology platform to execute targeted digital advertising campaigns on behalf of brand and agency customers. The Company provides advanced predictive targeting solutions across different customer industry verticals and consumer screens (desktop, mobile, Connected TV (“CTV”)), offering customized targeting, measurement and analytical services to address unique advertiser challenges. The Company operates in various cities across the United States and Canada, where its customers are primarily located. Intermediate and Acquisition are pass-thru entities, with principal operations taking place in AdTheorent. On July 27, 2021, MCAP Acquisition Corporation, a Delaware corporation (“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 (the “Blocker Member”), and the Company, entered into a business combination agreement (the “BCA” or the “Business Combination Agreement”) pursuant to which, among other things, (i) Merger Sub 1 will merge with and into the Blocker, with the Blocker surviving such merger as a wholly owned subsidiary of MCAP, (ii) immediately thereafter and pursuant to an integrated plan, the Blocker will merge with and into Merger Sub 2, with Merger Sub 2 surviving such merger as a wholly owned subsidiary of MCAP, (iii) immediately thereafter, Merger Sub 3 will merge with and into the Company, with the Company surviving such merger as a wholly owned subsidiary of MCAP and (iv) immediately thereafter and pursuant to an integrated plan, the Company will merge with and into Merger Sub 4, with Merger Sub 4 surviving such merger as a wholly owned subsidiary of MCAP. The transaction is structured as four mergers, collectively with the other transactions described in the Business Combination Agreement, the “Business Combination.” Impact of COVID-19 During the first quarter ended March 31, 2020, concerns related to the spread of novel coronavirus (“COVID-19”) began to create global business disruptions. COVID-19 was declared a global pandemic by the World Health Organization on March 11, 2020. Governments at the national, state and local level in the United States (“U.S.”), and globally, have implemented aggressive actions to reduce the spread of the virus, with such actions including lockdown and shelter in place orders, limitations on non-essential gatherings of people, suspension of all non-essential travel, and ordering certain businesses and governmental agencies to cease non-essential operations at physical locations. The spread of COVID-19 has caused significant volatility in the U.S. and international markets. While COVID-19 has not had a significant impact on the Company’s results from operations to date, the Company has developed and implemented a range of measures to address the risks, uncertainties and operational challenges associated with operating in a COVID-19 environment. The Company has taken and will continue to take proactive measures to provide for the well-being of its workforce while continuing to safely and effectively run operations. The Company has implemented alternative working practices, including enhanced cleaning protocols and safety measures throughout all Company offices, and a work from home option for all employees. The Coronavirus Aid, Relief and Economic Security Act (the “CARES Act”) in the U.S. includes measures that assist companies in responding to the COVID-19 pandemic. These measures consist primarily of cash assistance to support employment levels and deferment of remittance of certain non-income tax expense payments. The Company did not seek relief under the Payroll Protection Program (PPP) under the CARES Act because it determined that it had adequate access to capital from private sources. Additionally, the CARES Act provides for refundable employee retention tax credits and the deferral of the employer-paid portion of social security taxes. The Company has elected to defer the employer-paid portion of social security payroll taxes. The Company deferred a total of $930 of the employer portion of social security tax, which is included in Accrued compensation as of December 31, 2020. The deferred employment tax must be paid over two years; however, the Company expects to repay the deferred tax within the 2021 fiscal year and the Company has therefore classified it as a current liability. The Company repaid the deferred employment taxes in the nine months ended September 30, 2021, and there was a total of $0 of the employer portion of social security tax accrued as of September 30, 2021 (unaudited). The Company will continue to assess the impact that various provisions in the CARES Act will have on the business. The Company has assessed various accounting estimates and other matters, including those that require consideration of forecasted financial information, in context with the unknown future impacts of COVID-19 using information that is reasonably available to us at this time. While the Company’s current assessment of the estimates did not have a material impact on its Consolidated Financial Statements as of and for the year ended December 31, 2020 and for the nine month period ended September 30, 2021 (unaudited), as additional information becomes available to the Company, its future assessment of its estimates, including its expectations at the time regarding the duration, scope and severity of the pandemic, as well as other factors, could materially and adversely impact the Company’s Consolidated Financial Statements in future reporting periods. Liquidity The Company had cash and cash equivalents of $22,640 and working capital, calculated as current assets less current liabilities, of $20,453 as of September 30, 2021 (unaudited). The Company’s working capital includes term loans, net of deferred financing costs, amounting to $24,331, which are due in December of 2021. As of September 30, 2021 (unaudited), the Company had approximately $6,500 available for borrowing under its bank revolver. The Company believes it has sufficient sources of liquidity, including cash generated from operations and available capacity on the revolving credit facility, to support its operating needs, capital requirements, and debt service requirements for the next twelve months.
Mcap Acquisition Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Description of Organization and Business Operations	NOTE 1. DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS MCAP Acquisition Corporation (the “Company”) is a blank check company incorporated in Delaware on November 12, 2020. The Company was formed for the purpose of effectuating a merger, capital stock exchange, asset acquisition, stock purchase, reorganization or other similar business combination with one or more businesses (the “Business Combination”). The Company is an early stage and emerging growth company and, as such, the Company is subject to all of the risks associated with early stage and emerging growth companies. All activity for the period November 12, 2020 (inception) through March 2, 2021 relates to the Company’s formation and the initial public offering (the “Initial Public Offering”), which is described in Note 3. The registration statement for the Company’s Initial Public Offering was declared effective on February 25, 2021. On March 2, 2021, the Company consummated the Initial Public Offering of 31,625,000 units (“Units” and, with respect to the shares of Class A common stock included in the Units offered, the “Public Shares”), generating gross proceeds of $316,250,000, which is described in Note 3. Simultaneously with the closing of the Initial Public Offering, the Company consummated the sale of 5,983,333 private placement warrants (the “Private Placement Warrants”) at a price of $1.50 per warrant in a private placement to MCAP Acquisition, LLC (the “Sponsor”), generating gross proceeds of $8,975,000, which is described in Note 4. Following the closing of the Initial Public Offering on March 2, 2021, an amount of $316,250,000 ($10.00 per Unit) from the net proceeds of the sale of the Units in the Initial Public Offering and the Private Placement Warrants was placed in a trust account (“Trust Account”) which may be invested in U.S. government securities, within the meaning set forth in Section 2(a)(16) of the Investment Company Act of 1940, as amended (the “Investment Company Act”), with a maturity of 185 days or less or in any open-ended investment company that holds itself out as a money market fund meeting the conditions of Rule 2a-7 of the Investment Company Act, as determined by the Company, until the earlier of: (i) the consummation of a Business Combination or (ii) the distribution of the Trust Account to the Company’s stockholders, as described below. Transaction costs amounted to $17,853,629 consisting of $6,325,000 of underwriting fees, $11,068,750 of deferred underwriting fees (see Note 6) and $459,879 of other costs. In addition, $2,431,242 of cash was held outside of the Trust Account and is available for working capital purposes. The Company’s management has broad discretion with respect to the specific application of the net proceeds of the Initial Public Offering and the sale of the Private Placement Warrants, although substantially all of the net proceeds are intended to be applied generally toward consummating a Business Combination. NASDAQ rules provide that the Business Combination must be with one or more target businesses that together have a fair market value equal to at least 80% of the balance in the Trust Account (as defined below) (less any deferred underwriting commissions and taxes payable on interest earned on the Trust Account) at the time of the signing of a definitive agreement to enter a Business Combination. The Company will only complete a Business Combination if the post-Business Combination company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under the Investment Company Act. There is no assurance that the Company will be able to successfully effect a Business Combination. The Company will provide its holders of the outstanding Public Shares (the “public stockholders”) with the opportunity to redeem all or a portion of their Public Shares upon the completion of a Business Combination either (i) in connection with a stockholder meeting called to approve the Business Combination or (ii) by means of a tender offer. In connection with a proposed Business Combination, the Company may seek stockholder approval of a Business Combination at a meeting called for such purpose at which stockholders may seek to redeem their shares, regardless of whether they vote for or against a Business Combination. The Company will proceed with a Business Combination only if the Company has net tangible assets of at least $5,000,001 either immediately prior to or upon such consummation of a Business Combination and, if the Company seeks stockholder approval, a majority of the outstanding shares voted are voted in favor of the Business Combination. If the Company seeks stockholder approval of a Business Combination and it does not conduct redemptions pursuant to the tender offer rules, the Company’s Amended and Restated Certificate of Incorporation provides that a public stockholder, together with any affiliate of such stockholder or any other person with whom such stockholder is acting in concert or as a “group” (as defined under Section 13 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), will be restricted from seeking redemption rights with respect to 15% or more of the Public Shares without the Company’s prior written consent. The public stockholders will be entitled to redeem their shares for a pro rata portion of the amount then in the Trust Account (initially $10.00 per share, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company to pay its tax obligations). The per-share amount to be distributed to stockholders who redeem their shares will not be reduced by the deferred underwriting commissions the Company will pay to the underwriter (as discussed in Note 6). There will be no redemption rights upon the completion of a Business Combination with respect to the Company’s warrants. These shares of Class A common stock will be recorded at a redemption value and classified as temporary equity upon the completion of the Initial Public Offering, in accordance with Accounting Standards Codification (“ASC”) Topic 480 “Distinguishing Liabilities from Equity.” If a stockholder vote is not required and the Company does not decide to hold a stockholder vote for business or other legal reasons, the Company will, pursuant to its Amended and Restated Certificate of Incorporation, offer such redemption pursuant to the tender offer rules of the Securities and Exchange Commission (the “SEC”), and file tender offer documents containing substantially the same information as would be included in a proxy statement with the SEC prior to completing a Business Combination. The Company’s Sponsor has agreed (a) to vote its Founder Shares (as defined in Note 5) and any Public Shares purchased during or after the Initial Public Offering in favor of a Business Combination, (b) not to propose an amendment to the Company’s Amended and Restated Certificate of Incorporation with respect to the Company’s pre-Business Combination activities prior to the consummation of a Business Combination unless the Company provides dissenting public stockholders with the opportunity to redeem their Public Shares in conjunction with any such amendment; (c) not to redeem any shares (including the Founder Shares) and Private Placement Warrants into the right to receive cash from the Trust Account in connection with a stockholder vote to approve a Business Combination (or to sell any shares in a tender offer in connection with a Business Combination if the Company does not seek stockholder approval in connection therewith) or a vote to amend the provisions of the Amended and Restated Certificate of Incorporation relating to stockholders’ rights of pre-Business Combination activity and (d) that the Founder Shares and Private Placement Warrants shall not participate in any liquidating distributions upon winding up if a Business Combination is not consummated. However, the Sponsor will be entitled to liquidating distributions from the Trust Account with respect to any Public Shares purchased during or after the Initial Public Offering if the Company fails to complete its Business Combination. The Company will have until March 2, 2023 to consummate a Business Combination. If the Company is unable to complete a Business Combination within 24 months from the closing of the Initial Public Offering (the “Combination Period”), the Company will (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but no more than ten business days thereafter, redeem the public shares, at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest earned on the funds held in the Trust Account and not previously released to the Company to pay taxes (less up to $100,000 of interest to pay dissolution expenses), divided by the number of then outstanding public shares, which redemption will completely extinguish public stockholders’ rights as stockholders (including the right to receive further liquidation distributions, if any), subject to applicable law, and (iii) as promptly as reasonably possible following such redemption, subject to the approval of the remaining stockholders and the Company’s board of directors, proceed to commence a voluntary liquidation and thereby a formal dissolution of the Company, subject in each case to its obligations under Delaware law to provide for claims of creditors and the requirements of applicable law. The underwriter has agreed to waive its rights to the deferred underwriting commission held in the Trust Account in the event the Company does not complete a Business Combination within the Combination Period and, in such event, such amounts will be included with the funds held in the Trust Account that will be available to fund the redemption of the Public Shares. In the event of such distribution, it is possible that the per share value of the assets remaining available for distribution will be less than the Initial Public Offering price per Unit ($10.00). There will be no redemption rights or liquidating distributions with respect to the Founder Shares (as defined below) or the Private Placement Warrants, which will expire worthless if the Company fails to complete a Business Combination within the 24-month time period. The Sponsor has agreed that it will be liable to the Company if and to the extent any claims by a third party for services rendered or products sold to the Company, or a prospective target business with which the Company has entered into a written letter of intent, confidentiality or similar agreement or Business Combination agreement, reduce the amount of funds in the Trust Account to below the lesser of (i) $10.00 per Public Share and (ii) the actual amount per Public Share held in the Trust Account as of the day of liquidation of the Trust Account, if less than $10.00 per share due to reductions in the value of the trust assets, less taxes payable, provided that such liability will not apply to any claims by a third party or prospective target business who executed a waiver of any and all rights to monies held in the Trust Account (whether or not such waiver is enforceable) nor will it apply to any claims under the Company’s indemnity of the underwriter of Initial Public Offering against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”). However, the Company has not asked the Sponsor to reserve for such indemnification obligations, nor has the Company independently verified whether the Sponsor has sufficient funds to satisfy its indemnity obligations and believe that the Sponsor’s only assets are securities of the Company. Therefore, the Company cannot assure its stockholders that the Sponsor would be able to satisfy those obligations. None of the Company’s officers or directors will indemnify the Company for claims by third parties including, without limitation, claims by vendors and prospective target businesses. The Company will seek to reduce the possibility that the Sponsor will have to indemnify the Trust Account due to claims of creditors by endeavoring to have all vendors, service providers, prospective target businesses or other entities with which the Company does business, execute agreements with the Company waiving any right, title, interest or claim of any kind in or to monies held in the Trust Account. Management is currently evaluating the impact of the COVID-19 pandemic and has concluded that while it is reasonably possible that the virus could have a negative effect on the Company’s financial position, results of its operations and/or search for a target company, the specific impact is not readily determinable as of the date of the financial statement. The financial statement does not include any adjustments that might result from the outcome of this uncertainty. Going Concern and Management’s Plans The accompanying financial statement has been prepared on a going concern basis, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business. The Company’s management believes that its operations may not be sufficient to fund operating cash needs for at least 12 months from the issuance of this financial statement. The Company has no significant assets and has no revenue generating operations. There can be no assurance that the Company will be able to raise additional capital when needed, or at terms deemed acceptable, if at all. These factors raise substantial doubt about the Company’s ability to continue as a going concern for at least 12 months from the issuance of this financial statement. The accompanying financial statement does not include any adjustments relating to the recoverability and classification of asset carrying amounts or the amount and classification of liabilities that might result should the Company be unable to continue as a going concern.	NOTE 1. DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS MCAP Acquisition Corporation (the “Company”) is a blank check company incorporated in Delaware on November 12, 2020. The Company was formed for the purpose of effectuating a merger, capital stock exchange, asset acquisition, stock purchase, reorganization or other similar business combination with one or more businesses (the “Business Combination”). The Company is an early stage and emerging growth company and, as such, the Company is subject to all of the risks associated with early stage and emerging growth companies. As of December 31, 2020, the Company had not yet commenced any operations. All activity for the period November 12, 2020 (inception) through December 31, 2020 relates to the Company’s formation and the proposed initial public offering (the “Proposed Offering”). The Company has selected December 31 as its fiscal year end. The Company’s ability to commence operations is contingent upon obtaining adequate financial resources through a proposed initial public offering of 27,500,000 units at $10.00 per unit (or 31,625,000 units if the underwriter’s over-allotment option is exercised in full) (the “Units” and, with respect to the shares of Class A common stock included in the Units being offered, the “Public Shares”) which is discussed in Note 3 and the sale of 5,433,333 warrants (or 5,983,333 warrants if the underwriter’s over-allotment option is exercised in full) (the “Private Placement Warrants”) at a price of $1.50 per Private Placement Warrant that will close in a private placement to MCAP Acquisition, LLC (the “Sponsor”) simultaneously with the closing of the Proposed Offering (see Note 4). The Company’s management has broad discretion with respect to the specific application of the net proceeds of the Proposed Offering and the sale of the Private Placement Warrants, although substantially all of the net proceeds are intended to be applied generally toward consummating a Business Combination. NASDAQ rules provide that the Business Combination must be with one or more target businesses that together have a fair market value equal to at least 80% of the balance in the Trust Account (as defined below) (less any deferred underwriting commissions and taxes payable on interest earned on the Trust Account) at the time of the signing a definitive agreement to enter a Business Combination. The Company will only complete a Business Combination if the post-Business Combination company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under the Investment Company Act of 1940, as amended (the “Investment Company Act”). There is no assurance that the Company will be able to successfully effect a Business Combination. Upon the closing of the Proposed Offering, management has agreed that $10.00 per Unit sold in the Proposed Offering, including the proceeds from the sale of the Private Placement Warrants, will be held in a trust account (the “Trust Account”) and invested in U.S. government securities, within the meaning set forth in Section 2(a)(16) of the Investment Company Act, with a maturity of 185 days or less, or in any open-ended investment company that holds itself out as a money market fund meeting the conditions of Rule 2a-7 of the Investment Company Act, as determined by the Company, until the earlier of: (i) the consummation of a Business Combination or (ii) the distribution of the funds in the Trust Account to the Company’s stockholders, as described below. The Company will provide its holders of the outstanding Public Shares (the “public stockholders”) with the opportunity to redeem all or a portion of their Public Shares upon the completion of a Business Combination either (i) in connection with a stockholder meeting called to approve the Business Combination or (ii) by means of a tender offer. In connection with a proposed Business Combination, the Company may seek stockholder approval of a Business Combination at a meeting called for such purpose at which stockholders may seek to redeem their shares, regardless of whether they vote for or against a Business Combination. The Company will proceed with a Business Combination only if the Company has net tangible assets of at least $5,000,001 either immediately prior to or upon such consummation of a Business Combination and, if the Company seeks stockholder approval, a majority of the outstanding shares voted are voted in favor of the Business Combination. If the Company seeks stockholder approval of a Business Combination and it does not conduct redemptions pursuant to the tender offer rules, the Company’s Certificate of Incorporation provides that, a public stockholder, together with any affiliate of such stockholder or any other person with whom such stockholder is acting in concert or as a “group” (as defined under Section 13 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), will be restricted from seeking redemption rights with respect to 15% or more of the Public Shares without the Company’s prior written consent. The public stockholders will be entitled to redeem their shares for a pro rata portion of the amount then in the Trust Account (initially $10.00 per share, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company to pay its tax obligations). The per-share amount to be distributed to stockholders who redeem their shares will not be reduced by the deferred underwriting commissions the Company will pay to the underwriter (as discussed in Note 7). There will be no redemption rights upon the completion of a Business Combination with respect to the Company’s warrants. These shares of Class A common stock will be recorded at a redemption value and classified as temporary equity upon the completion of the Proposed Offering, in accordance with Accounting Standards Codification (“ASC”) Topic 480 “Distinguishing Liabilities from Equity.” If a stockholder vote is not required and the Company does not decide to hold a stockholder vote for business or other legal reasons, the Company will, pursuant to its Certificate of Incorporation, offer such redemption pursuant to the tender offer rules of the Securities and Exchange Commission (the “SEC”), and file tender offer documents containing substantially the same information as would be included in a proxy statement with the SEC prior to completing a Business Combination. The Company’s Sponsor has agreed (a) to vote its Founder Shares (as defined in Note 5) and any Public Shares purchased during or after the Proposed Offering in favor of a Business Combination, (b) not to propose an amendment to the Company’s Certificate of Incorporation with respect to the Company’s pre-Business Combination activities prior to the consummation of a Business Combination unless the Company provides dissenting public stockholders with the opportunity to redeem their Public Shares in conjunction with any such amendment; (c) not to redeem any shares (including the Founder Shares) into the right to receive cash from the Trust Account in connection with a stockholder vote to approve a Business Combination (or to sell any shares in a tender offer in connection with a Business Combination if the Company does not seek stockholder approval in connection therewith) or a vote to amend the provisions of the Amended and Restated Certificate of Incorporation relating to stockholders’ rights of pre-Business Combination activity and (d) that the Founder Shares shall not participate in any liquidating distributions upon winding up if a Business Combination is not consummated. However, the Sponsor will be entitled to liquidating distributions from the Trust Account with respect to any Public Shares purchased during or after the Proposed Offering if the Company fails to complete its Business Combination. If the Company is unable to complete a Business Combination within 24 months from the closing of the Proposed Offering (the “Combination Period”), the Company will (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but no more than ten business days thereafter, redeem the public shares, at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest earned on the funds held in the Trust Account and not previously released to us to pay taxes (less up to $100,000 of interest to pay dissolution expenses), divided by the number of then outstanding public shares, which redemption will completely extinguish public stockholders’ rights as stockholders (including the right to receive further liquidation distributions, if any), subject to applicable law, and (iii) as promptly as reasonably possible following such redemption, subject to the approval of the remaining stockholders and the Company’s board of directors, proceed to commence a voluntary liquidation and thereby a formal dissolution of the Company, subject in each case to its obligations under Delaware law to provide for claims of creditors and the requirements of applicable law. The underwriter has agreed to waive its rights to the deferred underwriting commission held in the Trust Account in the event the Company does not complete a Business Combination within the Combination Period and, in such event, such amounts will be included with the funds held in the Trust Account that will be available to fund the redemption of the Public Shares. In the event of such distribution, it is possible that the per share value of the assets remaining available for distribution will be less than the Proposed Offering price per Unit ($10.00). The Sponsor has agreed that it will be liable to the Company if and to the extent any claims by a third party for services rendered or products sold to the Company, or a prospective target business with which the Company has entered into a written letter of intent, confidentiality or similar agreement or Business Combination agreement, reduce the amount of funds in the Trust Account to below the lesser of (i) $10.00 per Public Share and (ii) the actual amount per Public Share held in the Trust Account as of the day of liquidation of the Trust Account, if less than $10.00 per share due to reductions in the value of the trust assets, less taxes payable, provided that such liability will not apply to any claims by a third party or prospective target business who executed a waiver of any and all rights to monies held in the Trust Account (whether or not such waiver is enforceable) nor will it apply to any claims under the Company’s indemnity of the underwriter of Proposed Offering against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”). However, the Company has not asked the Sponsor to reserve for such indemnification obligations, nor has the Company independently verified whether the Sponsor has sufficient funds to satisfy its indemnity obligations and believe that the Sponsor’s only assets are securities of the Company. Therefore, the Company cannot assure its stockholders that the Sponsor would be able to satisfy those obligations. None of the Company’s officers or directors will indemnify the Company for claims by third parties including, without limitation, claims by vendors and prospective target businesses. The Company will seek to reduce the possibility that the Sponsor will have to indemnify the Trust Account due to claims of creditors by endeavoring to have all vendors, service providers, prospective target businesses or other entities with which the Company does business, execute agreements with the Company waiving any right, title, interest or claim of any kind in or to monies held in the Trust Account. Going Concern Consideration At December 31, 2020, the Company had $25,000 in cash and working capital deficit of $140,584. The Company has incurred and expects to continue to incur significant costs in pursuit of its financing and acquisition plans. These conditions raise substantial doubt about the Company’s ability to continue as a going concern for a period of time within one year after the date that the financial statements are issued. Management plans to address this uncertainty through the Proposed Offering as discussed in Note 3. There is no assurance that the Company’s plans to raise capital or to consummate a Business Combination will be successful or successful within the Combination Period. The financial statements do not include any adjustments that might result from the outcome of this uncertainty.	Note 1—Description of Organization and Business Operations MCAP Acquisition Corporation (the “Company”) is a blank check company incorporated in Delaware on November 12, 2020. The Company was formed for the purpose of effectuating a merger, capital stock exchange, asset acquisition, stock purchase, reorganization or other similar business combination with one or more businesses (the “Business Combination”). The Company is an early stage and emerging growth company and, as such, the Company is subject to all of the risks associated with early stage and emerging growth companies. The accompanying condensed consolidated financial statements includes the Company and its wholly owned subsidiaries GRNT Merger Sub 1 LLC, GRNT Merger Sub 2 LLC, GRNT Merger Sub 3 LLC, and GRNT Merger Sub 4 LLC. As of September 30, 2021, the Company had not yet commenced any operations. All activity for the period November 12, 2020 (inception) through September 30, 2021 relates to the Company’s formation, initial public offering (the “Initial Public Offering”) and search to effectuate a Business Combination. The Company has selected December 31 as its fiscal year end. The registration statement for the Company’s Initial Public Offering was declared effective on February 25, 2021. On March 2, 2021, the Company consummated the Initial Public Offering of 31,625,000 units (“Units” and, with respect to the shares of Class A common stock included in the Units offered, the “Public Shares”), generating gross proceeds of $316,250,000, which is described in Note 3. Simultaneously with the closing of the Initial Public Offering, the Company consummated the sale of 5,983,333 private placement warrants (the “Private Placement Warrants”) at a price of $1.50 per warrant in a private placement to MCAP Acquisition, LLC (the “Sponsor”), generating gross proceeds of $8,975,000, which is described in Note 4. Following the closing of the Initial Public Offering on March 2, 2021, an amount of $316,250,000 ($10.00 per Unit) from the net proceeds of the sale of the Units in the Initial Public Offering and the Private Placement Warrants was placed in a trust account (“Trust Account”) which may be invested in U.S. government securities, within the meaning set forth in Section 2(a)(16) of the Investment Company Act of 1940, as amended (the “Investment Company Act”), with a maturity of 185 days or less or in any open-ended investment company that holds itself out as a money market fund meeting the conditions of Rule 2a-7 of the Investment Company Act, as determined by the Company, until the earlier of: (i) the consummation of a Business Combination or (ii) the distribution of the Trust Account to the Company’s stockholders, as described below. Transaction costs of the Initial Public Offering amounted to $17,853,629 consisting of $6,325,000 of underwriting fees, $11,068,750 of deferred underwriting fees (see Note 6) and $459,879 of other costs. Following the closing of the Initial Public Offering $2,431,242 of cash was held outside of the Trust Account available for working capital purposes. As of September 30, 2021, we have available to us $797,602 of cash on our balance sheet and a working capital surplus of $706,131. The Company’s management has broad discretion with respect to the specific application of the net proceeds of the Initial Public Offering and the sale of the Private Placement Warrants, although substantially all of the net proceeds are intended to be applied generally toward consummating a Business Combination. NASDAQ rules provide that the Business Combination must be with one or more target businesses that together have a fair market value equal to at least 80% of the balance in the Trust Account (as defined below) (less any deferred underwriting commissions and taxes payable on interest earned on the Trust Account) at the time of the signing of a definitive agreement to enter a Business Combination. The Company will only complete a Business Combination if the post-Business Combination company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under the Investment Company Act. There is no assurance that the Company will be able to successfully effect a Business Combination. The Company will provide its holders of the outstanding Public Shares (the “public stockholders”) with the opportunity to redeem all or a portion of their Public Shares upon the completion of a Business Combination either (i) in connection with a stockholder meeting called to approve the Business Combination or (ii) by means of a tender offer. In connection with a proposed Business Combination, the Company may seek stockholder approval of a Business Combination at a meeting called for such purpose at which stockholders may seek to redeem their shares, regardless of whether they vote for or against a Business Combination. The Company will proceed with a Business Combination only if the Company has net tangible assets of at least $5,000,001 either immediately prior to or upon such consummation of a Business Combination and, if the Company seeks stockholder approval, a majority of the outstanding shares voted are voted in favor of the Business Combination. The Company will have until March 2, 2023 to consummate a Business Combination. If the Company is unable to complete a Business Combination within 24 months from the closing of the Initial Public Offering (the “Combination Period”), the Company will (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but no more than ten business days thereafter, redeem the public shares, at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest earned on the funds held in the Trust Account and not previously released to the Company to pay taxes (less up to $100,000 of interest to pay dissolution expenses), divided by the number of then outstanding public shares, which redemption will completely extinguish public stockholders’ rights as stockholders (including the right to receive further liquidation distributions, if any), subject to applicable law, and (iii) as promptly as reasonably possible following such redemption, subject to the approval of the remaining stockholders and the Company’s board of directors, proceed to commence a voluntary liquidation and thereby a formal dissolution of the Company, subject in each case to its obligations under Delaware law to provide for claims of creditors and the requirements of applicable law. The underwriter has agreed to waive its rights to the deferred underwriting commission held in the Trust Account in the event the Company does not complete a Business Combination within the Combination Period and, in such event, such amounts will be included with the funds held in the Trust Account that will be available to fund the redemption of the Public Shares. In the event of such distribution, it is possible that the per share value of the assets remaining available for distribution will be less than the Initial Public Offering price per Unit ($10.00). There will be no redemption rights or liquidating distributions with respect to the Founder Shares (as defined below) or the Private Placement Warrants, which will expire worthless if the Company fails to complete a Business Combination within the 24-month time period. The Sponsor has agreed that it will be liable to the Company if and to the extent any claims by a third party for services rendered or products sold to the Company, or a prospective target business with which the Company has entered into a written letter of intent, confidentiality or similar agreement or Business Combination agreement, reduce the amount of funds in the Trust Account to below the lesser of (i) $10.00 per Public Share and (ii) the actual amount per Public Share held in the Trust Account as of the day of liquidation of the Trust Account, if less than $10.00 per share due to reductions in the value of the trust assets, less taxes payable, provided that such liability will not apply to any claims by a third party or prospective target business who executed a waiver of any and all rights to monies held in the Trust Account (whether or not such waiver is enforceable) nor will it apply to any claims under the Company’s indemnity of the underwriter of Initial Public Offering against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”). However, the Company has not asked the Sponsor to reserve for such indemnification obligations, nor has the Company independently verified whether the Sponsor has sufficient funds to satisfy its indemnity obligations and believe that the Sponsor’s only assets are securities of the Company. Therefore, the Company cannot assure its stockholders that the Sponsor would be able to satisfy those obligations. None of the Company’s officers or directors will indemnify the Company for claims by third parties including, without limitation, claims by vendors and prospective target businesses. The Company will seek to reduce the possibility that the Sponsor will have to indemnify the Trust Account due to claims of creditors by endeavoring to have all vendors, service providers, prospective target businesses or other entities with which the Company does business, execute agreements with the Company waiving any right, title, interest or claim of any kind in or to monies held in the Trust Account. Going Concern and Management’s Plans The accompanying unaudited condensed consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business. As of September 30, 2021, we had incurred accumulated losses of approximately $2,915,213 for the period from November 12, 2020 (date of inception) through September 30, 2021. The Company’s management believes that its operations may not be sufficient to fund operating cash needs for at least 12 months from the issuance of these financial statements. The Company has no significant assets and has no revenue generating operations. There can be no assurance however that the Company will be able to raise additional capital when needed, or at terms deemed acceptable, if at all. These factors raise substantial doubt about the company’s ability to continue as a going concern within one year after the date that the unaudited condensed financial statements are issued. The unaudited condensed consolidated financial statements do not include any adjustments relating to the recoverability and classification of asset carrying amounts or the amount and classification of liabilities that might result should the Company be unable to continue as a going concern. Risks and Uncertainties Management is currently evaluating the impact of the COVID-19 pandemic and has concluded that while it is reasonably possible that the virus could have a negative effect on the Company’s financial position, results of its operations and/or search for a target company, the specific impact is not readily determinable as of the date of the financial statement. The financial statements do not include any adjustments that might result from the outcome of this uncertainty.

Description of Organization and Business Operations

2 Months Ended

9 Months Ended

Mar. 02, 2021

Dec. 31, 2020

Sep. 30, 2021

Subsidiary, Sale of Stock [Line Items]

Description of Organization and Business Operations

1. NATURE OF BUSINESS

AdTheorent

Holding Company LLC (“Holding Co.”) is a Delaware limited liability company and is headquartered in New York City. Holding Co. is the parent of AdTheorent Intermediate Holding Corporation (“Intermediate”), a Delaware corporation. Intermediate is the parent of AdTheorent Acquisition Corporation (“Acquisition”), also a Delaware corporation. Acquisition is the parent company of AdTheorent, Inc. (“AdTheorent”). AdTheorent is the parent of AdTheorent Canada, Inc., a Nova Scotia corporation. These entities collectively are referred to herein as “the Company”, “us” or “our”. AdTheorent generates revenue by using its proprietary machine learning-powered technology platform to execute targeted digital advertising campaigns on behalf of brand and agency customers. The Company provides advanced predictive targeting solutions across different customer industry verticals and consumer screens (desktop, mobile, Connected TV (“CTV”)), offering customized targeting, measurement and analytical services to address unique advertiser challenges. The Company operates in various cities across the United States and Canada, where its customers are primarily located. Intermediate and Acquisition are pass-thru entities, with principal operations taking place in AdTheorent.

On July 27, 2021, MCAP Acquisition Corporation, a Delaware corporation (“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 (the “Blocker Member”), and the Company, entered into a business combination agreement (the “BCA” or the “Business Combination Agreement”) pursuant to which, among other things, (i) Merger Sub 1 will merge with and into the Blocker, with the Blocker surviving such merger as a wholly owned subsidiary of MCAP, (ii) immediately thereafter and pursuant to an integrated plan, the Blocker will merge with and into Merger Sub 2, with Merger Sub 2 surviving such merger as a wholly owned subsidiary of MCAP, (iii) immediately thereafter, Merger Sub 3 will merge with and into the Company, with the Company surviving such merger as a wholly owned subsidiary of MCAP and (iv) immediately thereafter and pursuant to an integrated plan, the Company will merge with and into Merger Sub 4, with Merger Sub 4 surviving such merger as a wholly owned subsidiary of MCAP. The transaction is structured as four mergers, collectively with the other transactions described in the Business Combination Agreement, the “Business Combination.”

Impact of

COVID-19

During the first quarter ended March 31, 2020, concerns related to the spread of novel coronavirus

(“COVID-19”)

began to create global business disruptions.

COVID-19

was declared a global pandemic by the World Health Organization on March 11, 2020. Governments at the national, state and local level in the United States (“U.S.”), and globally, have implemented aggressive actions to reduce the spread of the virus, with such actions including lockdown and shelter in place orders, limitations on

non-essential

gatherings of people, suspension of all

non-essential

travel, and ordering certain businesses and governmental agencies to cease

non-essential

operations at physical locations. The spread of

COVID-19

has caused significant volatility in the U.S. and international markets.

While

COVID-19

has not had a significant impact on the Company’s results from operations to date, the Company has developed and implemented a range of measures to address the risks, uncertainties and operational challenges associated with operating in a

COVID-19

environment. The Company has taken and will continue to

take proactive measures to provide for the well-being of its workforce while continuing to safely and effectively run operations. The Company has implemented alternative working practices, including enhanced cleaning protocols and safety measures throughout all Company offices, and a work from home option for all employees.

The Coronavirus Aid, Relief and Economic Security Act (the “CARES Act”) in the U.S. includes measures that assist companies in responding to the

COVID-19

pandemic. These measures consist primarily of cash assistance to support employment levels and deferment of remittance of certain

non-income

tax expense payments. The Company did not seek relief under the Payroll Protection Program (PPP) under the CARES Act because it determined that it had adequate access to capital from private sources. Additionally, the CARES Act provides for refundable employee retention tax credits and the deferral of the employer-paid portion of social security taxes. The Company has elected to defer the employer-paid portion of social security payroll taxes. The Company deferred a total of $930 of the employer portion of social security tax, which is included in Accrued compensation as of December 31, 2020. The deferred employment tax must be paid over two years; however, the Company expects to repay the deferred tax within the 2021 fiscal year and the Company has therefore classified it as a current liability. The Company repaid the deferred employment taxes in the nine months ended September 30, 2021, and there was a total of $0 of the employer portion of social security tax accrued as of September 30, 2021 (unaudited). The Company will continue to assess the impact that various provisions in the CARES Act will have on the business.

The Company has assessed various accounting estimates and other matters, including those that require consideration of forecasted financial information, in context with the unknown future impacts of

COVID-19

using information that is reasonably available to us at this time. While the Company’s current assessment of the estimates did not have a material impact on its Consolidated Financial Statements as of and for the year ended December 31, 2020 and for the nine month period ended September 30, 2021 (unaudited), as additional information becomes available to the Company, its future assessment of its estimates, including its expectations at the time regarding the duration, scope and severity of the pandemic, as well as other factors, could materially and adversely impact the Company’s Consolidated Financial Statements in future reporting periods.

Liquidity

The Company had cash and cash equivalents of $22,640 and working capital, calculated as current assets less current liabilities, of $20,453 as of September 30, 2021 (unaudited). The Company’s working capital includes term loans, net of deferred financing costs, amounting to $24,331, which are due in December of 2021. As of September 30, 2021 (unaudited), the Company had approximately $6,500 available for borrowing under its bank revolver. The Company believes it has sufficient sources of liquidity, including cash generated from operations and available capacity on the revolving credit facility, to support its operating needs, capital requirements, and debt service requirements for the next twelve months.

Mcap Acquisition Corp [Member]

Subsidiary, Sale of Stock [Line Items]

Description of Organization and Business Operations

NOTE 1. DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS

MCAP Acquisition Corporation (the “Company”) is a blank check company incorporated in Delaware on November 12, 2020. The Company was formed for the purpose of effectuating a merger, capital stock exchange, asset acquisition, stock purchase, reorganization or other similar business combination with one or more businesses (the “Business Combination”). The Company is an early stage and emerging growth company and, as such, the Company is subject to all of the risks associated with early stage and emerging growth companies.

All activity for the period November 12, 2020 (inception) through March 2, 2021 relates to the Company’s formation and the initial public offering (the “Initial Public Offering”), which is described in Note 3.

The registration statement for the Company’s Initial Public Offering was declared effective on February 25, 2021. On March 2, 2021, the Company consummated the Initial Public Offering of 31,625,000 units (“Units” and, with respect to the shares of Class A common stock included in the Units offered, the “Public Shares”), generating gross proceeds of $316,250,000, which is described in Note 3.

Simultaneously with the closing of the Initial Public Offering, the Company consummated the sale of 5,983,333 private placement warrants (the “Private Placement Warrants”) at a price of $1.50 per warrant in a private placement to MCAP Acquisition, LLC (the “Sponsor”), generating gross proceeds of $8,975,000, which is described in Note 4.

Following the closing of the Initial Public Offering on March 2, 2021, an amount of $316,250,000 ($10.00 per Unit) from the net proceeds of the sale of the Units in the Initial Public Offering and the Private Placement Warrants was placed in a trust account (“Trust Account”) which may be invested in U.S. government securities, within the meaning set forth in Section 2(a)(16) of the Investment Company Act of 1940, as amended (the “Investment Company Act”), with a maturity of 185 days or less or in any open-ended investment company that holds itself out as a money market fund meeting the conditions of Rule

2a-7

of the Investment Company Act, as determined by the Company, until the earlier of: (i) the consummation of a Business Combination or (ii) the distribution of the Trust Account to the Company’s stockholders, as described below.

Transaction costs amounted to $17,853,629 consisting of $6,325,000 of underwriting fees, $11,068,750 of deferred underwriting fees (see Note 6) and $459,879 of other costs. In addition, $2,431,242 of cash was held outside of the Trust Account and is available for working capital purposes.

The Company’s management has broad discretion with respect to the specific application of the net proceeds of the Initial Public Offering and the sale of the Private Placement Warrants, although substantially all of the net proceeds are intended to be applied generally toward consummating a Business Combination. NASDAQ rules provide that the Business Combination must be with one or more target businesses that together have a fair market value equal to at least 80% of the balance in the Trust Account (as defined below) (less any deferred underwriting commissions and taxes payable on interest earned on the Trust Account) at the time of the signing of a definitive agreement to enter a Business Combination. The Company will only complete a Business Combination if the post-Business Combination company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under the Investment Company Act. There is no assurance that the Company will be able to successfully effect a Business Combination.

of a tender offer. In connection with a proposed Business Combination, the Company may seek stockholder approval of a Business Combination at a meeting called for such purpose at which stockholders may seek to redeem their shares, regardless of whether they vote for or against a Business Combination. The Company will proceed with a Business Combination only if the Company has net tangible assets of at least $5,000,001 either immediately prior to or upon such consummation of a Business Combination and, if the Company seeks stockholder approval, a majority of the outstanding shares voted are voted in favor of the Business Combination.

If the Company seeks stockholder approval of a Business Combination and it does not conduct redemptions pursuant to the tender offer rules, the Company’s Amended and Restated Certificate of Incorporation provides that a public stockholder, together with any affiliate of such stockholder or any other person with whom such stockholder is acting in concert or as a “group” (as defined under Section 13 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), will be restricted from seeking redemption rights with respect to 15% or more of the Public Shares without the Company’s prior written consent.

The public stockholders will be entitled to redeem their shares for a pro rata portion of the amount then in the Trust Account (initially $10.00 per share, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company to pay its tax obligations). The

per-share

amount to be distributed to stockholders who redeem their shares will not be reduced by the deferred underwriting commissions the Company will pay to the underwriter (as discussed in Note 6). There will be no redemption rights upon the completion of a Business Combination with respect to the Company’s warrants. These shares of Class A common stock will be recorded at a redemption value and classified as temporary equity upon the completion of the Initial Public Offering, in accordance with Accounting Standards Codification (“ASC”) Topic 480 “Distinguishing Liabilities from Equity.”

If a stockholder vote is not required and the Company does not decide to hold a stockholder vote for business or other legal reasons, the Company will, pursuant to its Amended and Restated Certificate of Incorporation, offer such redemption pursuant to the tender offer rules of the Securities and Exchange Commission (the “SEC”), and file tender offer documents containing substantially the same information as would be included in a proxy statement with the SEC prior to completing a Business Combination.

The Company’s Sponsor has agreed (a) to vote its Founder Shares (as defined in Note 5) and any Public Shares purchased during or after the Initial Public Offering in favor of a Business Combination, (b) not to propose an amendment to the Company’s Amended and Restated Certificate of Incorporation with respect to the Company’s

pre-Business

Combination activities prior to the consummation of a Business Combination unless the Company provides dissenting public stockholders with the opportunity to redeem their Public Shares in conjunction with any such amendment; (c) not to redeem any shares (including the Founder Shares) and Private Placement Warrants into the right to receive cash from the Trust Account in connection with a stockholder vote to approve a Business Combination (or to sell any shares in a tender offer in connection with a Business Combination if the Company does not seek stockholder approval in connection therewith) or a vote to amend the provisions of the Amended and Restated Certificate of Incorporation relating to stockholders’ rights of

pre-Business

Combination activity and (d) that the Founder Shares and Private Placement Warrants shall not participate in any liquidating distributions upon winding up if a Business Combination is not consummated. However, the Sponsor will be entitled to liquidating distributions from the Trust Account with respect to any Public Shares purchased during or after the Initial Public Offering if the Company fails to complete its Business Combination.

“Combination Period”), the Company will (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but no more than ten business days thereafter, redeem the public shares, at a

per-share

price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest earned on the funds held in the Trust Account and not previously released to the Company to pay taxes (less up to $100,000 of interest to pay dissolution expenses), divided by the number of then outstanding public shares, which redemption will completely extinguish public stockholders’ rights as stockholders (including the right to receive further liquidation distributions, if any), subject to applicable law, and (iii) as promptly as reasonably possible following such redemption, subject to the approval of the remaining stockholders and the Company’s board of directors, proceed to commence a voluntary liquidation and thereby a formal dissolution of the Company, subject in each case to its obligations under Delaware law to provide for claims of creditors and the requirements of applicable law. The underwriter has agreed to waive its rights to the deferred underwriting commission held in the Trust Account in the event the Company does not complete a Business Combination within the Combination Period and, in such event, such amounts will be included with the funds held in the Trust Account that will be available to fund the redemption of the Public Shares. In the event of such distribution, it is possible that the per share value of the assets remaining available for distribution will be less than the Initial Public Offering price per Unit ($10.00). There will be no redemption rights or liquidating distributions with respect to the Founder Shares (as defined below) or the Private Placement Warrants, which will expire worthless if the Company fails to complete a Business Combination within the

24-month

time period.

The Sponsor has agreed that it will be liable to the Company if and to the extent any claims by a third party for services rendered or products sold to the Company, or a prospective target business with which the Company has entered into a written letter of intent, confidentiality or similar agreement or Business Combination agreement, reduce the amount of funds in the Trust Account to below the lesser of (i) $10.00 per Public Share and (ii) the actual amount per Public Share held in the Trust Account as of the day of liquidation of the Trust Account, if less than $10.00 per share due to reductions in the value of the trust assets, less taxes payable, provided that such liability will not apply to any claims by a third party or prospective target business who executed a waiver of any and all rights to monies held in the Trust Account (whether or not such waiver is enforceable) nor will it apply to any claims under the Company’s indemnity of the underwriter of Initial Public Offering against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”). However, the Company has not asked the Sponsor to reserve for such indemnification obligations, nor has the Company independently verified whether the Sponsor has sufficient funds to satisfy its indemnity obligations and believe that the Sponsor’s only assets are securities of the Company. Therefore, the Company cannot assure its stockholders that the Sponsor would be able to satisfy those obligations. None of the Company’s officers or directors will indemnify the Company for claims by third parties including, without limitation, claims by vendors and prospective target businesses. The Company will seek to reduce the possibility that the Sponsor will have to indemnify the Trust Account due to claims of creditors by endeavoring to have all vendors, service providers, prospective target businesses or other entities with which the Company does business, execute agreements with the Company waiving any right, title, interest or claim of any kind in or to monies held in the Trust Account.

Management is currently evaluating the impact of the

COVID-19

pandemic and has concluded that while it is reasonably possible that the virus could have a negative effect on the Company’s financial position, results of its operations and/or search for a target company, the specific impact is not readily determinable as of the date of the financial statement. The financial statement does not include any adjustments that might result from the outcome of this uncertainty.

Going Concern and Management’s Plans

The accompanying financial statement has been prepared on a going concern basis, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business. The Company’s management believes that its operations may not be sufficient to fund operating cash needs for at least 12 months from the issuance of this financial statement. The Company has no significant assets and has no revenue generating operations. There can be no assurance that the Company will be able to raise additional capital when needed, or at terms deemed acceptable, if at all. These factors raise substantial doubt about the Company’s ability to continue as a going concern for at least 12 months from the issuance of this financial statement. The accompanying financial statement does not include any adjustments relating to the recoverability and classification of asset carrying amounts or the amount and classification of liabilities that might result should the Company be unable to continue as a going concern.

NOTE 1. DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS

As of December 31, 2020, the Company had not yet commenced any operations. All activity for the period November 12, 2020 (inception) through December 31, 2020 relates to the Company’s formation and the proposed initial public offering (the “Proposed Offering”). The Company has selected December 31 as its fiscal year end.

The Company’s ability to commence operations is contingent upon obtaining adequate financial resources through a proposed initial public offering of 27,500,000 units at $10.00 per unit (or 31,625,000 units if the underwriter’s over-allotment option is exercised in full) (the “Units” and, with respect to the shares of Class A common stock included in the Units being offered, the “Public Shares”) which is discussed in Note 3 and the sale of 5,433,333 warrants (or 5,983,333 warrants if the underwriter’s over-allotment option is exercised in full) (the “Private Placement Warrants”) at a price of $1.50 per Private Placement Warrant that will close in a private placement to MCAP Acquisition, LLC (the “Sponsor”) simultaneously with the closing of the Proposed Offering (see Note 4).

The Company’s management has broad discretion with respect to the specific application of the net proceeds of the Proposed Offering and the sale of the Private Placement Warrants, although substantially all of the net proceeds are intended to be applied generally toward consummating a Business Combination. NASDAQ rules provide that the Business Combination must be with one or more target businesses that together have a fair market value equal to at least 80% of the balance in the Trust Account (as defined below) (less any deferred underwriting commissions and taxes payable on interest earned on the Trust Account) at the time of the signing a definitive agreement to enter a Business Combination. The Company will only complete a Business Combination if the post-Business Combination company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under the Investment Company Act of 1940, as amended (the “Investment Company Act”). There is no assurance that the Company will be able to successfully effect a Business Combination. Upon the closing of the Proposed Offering, management has agreed that $10.00 per Unit sold in the Proposed Offering, including the proceeds from the sale of the Private Placement Warrants, will be held in a trust account (the “Trust Account”) and invested in U.S. government securities, within the meaning set forth in Section 2(a)(16) of the Investment Company Act, with a maturity of 185 days or less, or in any open-ended investment company that holds itself out as a money market fund meeting the conditions of

Rule 2a-7

of the Investment Company Act, as determined by the Company, until the earlier of: (i) the consummation of a Business Combination or (ii) the distribution of the funds in the Trust Account to the Company’s stockholders, as described below.

The Company will provide its holders of the outstanding Public Shares (the “public stockholders”) with the opportunity to redeem all or a portion of their Public Shares upon the completion of a Business Combination either (i) in connection with a stockholder meeting called to approve the Business Combination or (ii) by means of a tender offer. In connection with a proposed Business Combination, the Company may seek stockholder approval of a Business Combination at a meeting called for such purpose at which stockholders may seek to redeem their shares, regardless of whether they vote for or against a Business Combination. The Company will proceed with a Business Combination only if the Company has net tangible assets of at least $5,000,001 either immediately prior to or upon such consummation of a Business Combination and, if the Company seeks stockholder approval, a majority of the outstanding shares voted are voted in favor of the Business Combination.

If the Company seeks stockholder approval of a Business Combination and it does not conduct redemptions pursuant to the tender offer rules, the Company’s Certificate of Incorporation provides that, a public stockholder, together with any affiliate of such stockholder or any other person with whom such stockholder is acting in concert or as a “group” (as defined under Section 13 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), will be restricted from seeking redemption rights with respect to 15% or more of the Public Shares without the Company’s prior written consent.

per-share

amount to be distributed to stockholders who redeem their shares will not be reduced by the deferred underwriting commissions the Company will pay to the underwriter (as discussed in Note 7). There will be no redemption rights upon the completion of a Business Combination with respect to the Company’s warrants. These shares of Class A common stock will be recorded at a redemption value and classified as temporary equity upon the completion of the Proposed Offering, in accordance with Accounting Standards Codification (“ASC”) Topic 480 “Distinguishing Liabilities from Equity.”

If a stockholder vote is not required and the Company does not decide to hold a stockholder vote for business or other legal reasons, the Company will, pursuant to its Certificate of Incorporation, offer such redemption pursuant to the tender offer rules of the Securities and Exchange Commission (the “SEC”), and file tender offer documents containing substantially the same information as would be included in a proxy statement with the SEC prior to completing a Business Combination.

The Company’s Sponsor has agreed (a) to vote its Founder Shares (as defined in Note 5) and any Public Shares purchased during or after the Proposed Offering in favor of a Business Combination, (b) not to propose an amendment to the Company’s Certificate of Incorporation with respect to the Company’s

pre-Business

Combination activities prior to the consummation of a Business Combination unless the Company provides dissenting public stockholders with the opportunity to redeem their Public Shares in conjunction with any such amendment; (c) not to redeem any shares (including the Founder Shares) into the right to receive cash from the Trust Account in connection with a stockholder vote to approve a Business Combination (or to sell any shares in a tender offer in connection with a Business Combination if the Company does not seek stockholder approval in connection therewith) or a vote to amend the provisions of the Amended and Restated Certificate of Incorporation relating to stockholders’ rights of

pre-Business

Combination activity and (d) that the Founder Shares shall not participate in any liquidating distributions upon winding up if a Business Combination is not consummated. However, the Sponsor will be entitled to liquidating distributions from the Trust Account with respect to any Public Shares purchased during or after the Proposed Offering if the Company fails to complete its Business Combination.

If the Company is unable to complete a Business Combination within 24 months from the closing of the Proposed Offering (the “Combination Period”), the Company will (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but no more than ten business days thereafter, redeem the public shares, at a

per-share

funds held in the Trust Account that will be available to fund the redemption of the Public Shares. In the event of such distribution, it is possible that the per share value of the assets remaining available for distribution will be less than the Proposed Offering price per Unit ($10.00).

The Sponsor has agreed that it will be liable to the Company if and to the extent any claims by a third party for services rendered or products sold to the Company, or a prospective target business with which the Company has entered into a written letter of intent, confidentiality or similar agreement or Business Combination agreement, reduce the amount of funds in the Trust Account to below the lesser of (i) $10.00 per Public Share and (ii) the actual amount per Public Share held in the Trust Account as of the day of liquidation of the Trust Account, if less than $10.00 per share due to reductions in the value of the trust assets, less taxes payable, provided that such liability will not apply to any claims by a third party or prospective target business who executed a waiver of any and all rights to monies held in the Trust Account (whether or not such waiver is enforceable) nor will it apply to any claims under the Company’s indemnity of the underwriter of Proposed Offering against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”). However, the Company has not asked the Sponsor to reserve for such indemnification obligations, nor has the Company independently verified whether the Sponsor has sufficient funds to satisfy its indemnity obligations and believe that the Sponsor’s only assets are securities of the Company. Therefore, the Company cannot assure its stockholders that the Sponsor would be able to satisfy those obligations. None of the Company’s officers or directors will indemnify the Company for claims by third parties including, without limitation, claims by vendors and prospective target businesses. The Company will seek to reduce the possibility that the Sponsor will have to indemnify the Trust Account due to claims of creditors by endeavoring to have all vendors, service providers, prospective target businesses or other entities with which the Company does business, execute agreements with the Company waiving any right, title, interest or claim of any kind in or to monies held in the Trust Account.

Going Concern Consideration

At December 31, 2020, the Company had $25,000 in cash and working capital deficit of $140,584. The Company has incurred and expects to continue to incur significant costs in pursuit of its financing and acquisition plans. These conditions raise substantial doubt about the Company’s ability to continue as a going concern for a period of time within one year after the date that the financial statements are issued. Management plans to address this uncertainty through the Proposed Offering as discussed in Note 3. There is no assurance that the Company’s plans to raise capital or to consummate a Business Combination will be successful or successful within the Combination Period. The financial statements do not include any adjustments that might result from the outcome of this uncertainty.

Note 1—Description of Organization and Business Operations

The accompanying condensed consolidated financial statements includes the Company and its wholly owned subsidiaries GRNT Merger Sub 1 LLC, GRNT Merger Sub 2 LLC, GRNT Merger Sub 3 LLC, and GRNT Merger Sub 4 LLC.

As of September 30, 2021, the Company had not yet commenced any operations. All activity for the period November 12, 2020 (inception) through September 30, 2021 relates to the Company’s formation, initial public offering (the “Initial Public Offering”) and search to effectuate a Business Combination. The Company has selected December 31 as its fiscal year end.

Rule 2a-7

Transaction costs of the Initial Public Offering amounted to $17,853,629 consisting of $6,325,000 of underwriting fees, $11,068,750 of deferred underwriting fees (see Note 6) and $459,879 of other costs.

Following the closing of the Initial Public Offering $2,431,242 of cash was held outside of the Trust Account available for working capital purposes. As of September 30, 2021, we have available to us $797,602 of cash on our balance sheet and a working capital surplus of $706,131.

underwriting commissions and taxes payable on interest earned on the Trust Account) at the time of the signing of a definitive agreement to enter a Business Combination. The Company will only complete a Business Combination if the post-Business Combination company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under the Investment Company Act. There is no assurance that the Company will be able to successfully effect a Business Combination.

The Company will have until March 2, 2023 to consummate a Business Combination. If the Company is unable to complete a Business Combination within 24 months from the closing of the Initial Public Offering (the “Combination Period”), the Company will (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but no more than ten business days thereafter, redeem the public shares, at a

per-share

24-month

time period.

any claims under the Company’s indemnity of the underwriter of Initial Public Offering against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”). However, the Company has not asked the Sponsor to reserve for such indemnification obligations, nor has the Company independently verified whether the Sponsor has sufficient funds to satisfy its indemnity obligations and believe that the Sponsor’s only assets are securities of the Company. Therefore, the Company cannot assure its stockholders that the Sponsor would be able to satisfy those obligations. None of the Company’s officers or directors will indemnify the Company for claims by third parties including, without limitation, claims by vendors and prospective target businesses. The Company will seek to reduce the possibility that the Sponsor will have to indemnify the Trust Account due to claims of creditors by endeavoring to have all vendors, service providers, prospective target businesses or other entities with which the Company does business, execute agreements with the Company waiving any right, title, interest or claim of any kind in or to monies held in the Trust Account.

Going Concern and Management’s Plans

The accompanying unaudited condensed consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business. As of September 30, 2021, we had incurred accumulated losses of approximately $2,915,213 for the period from November 12, 2020 (date of inception) through September 30, 2021.

The Company’s management believes that its operations may not be sufficient to fund operating cash needs for at least 12 months from the issuance of these financial statements. The Company has no significant assets and has no revenue generating operations. There can be no assurance however that the Company will be able to raise additional capital when needed, or at terms deemed acceptable, if at all. These factors raise substantial doubt about the company’s ability to continue as a going concern within one year after the date that the unaudited condensed financial statements are issued.

The unaudited condensed consolidated financial statements do not include any adjustments relating to the recoverability and classification of asset carrying amounts or the amount and classification of liabilities that might result should the Company be unable to continue as a going concern.

Risks and Uncertainties

Management is currently evaluating the impact of the

COVID-19

pandemic and has concluded that while it is reasonably possible that the virus could have a negative effect on the Company’s financial position, results of its operations and/or search for a target company, the specific impact is not readily determinable as of the date of the financial statement. The financial statements do not include any adjustments that might result from the outcome of this uncertainty.