United States securities and exchange commission logo February 18, 2021 Theodore Koenig Chairman and Chief Executive Officer MCAP Acquisition Corp 311 South Wacker Drive Suite 6400 Chicago, IL 60606 Re: MCAP Acquisition Corp Amendment No. 1 to Form S-1 filed February 12, 2021 File No. 333-252607 Dear Mr. Koenig: We have reviewed your registration statement and have the following comments. 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. Amendment No. 1 to Form S-1 filed February 12, 2021 Expression of Interest, page 14 1. Please revise to disclose the percentage of public shares needed to approve an acquisition if the "certain members" of your sponsor purchase the maximum amount of units in the offering and the committed amount in the private placement and vote them in favor of a transaction. Additionally, please disclose the percentage needed assuming only the minimum number of stockholders required to be present at the stockholders' meeting held to approve the initial business combination are present at the meeting. Please also file the form of agreement between the investors and sponsor for the public shares wherein the investors have agreed to vote their public shares in favor of any initial business combination and not to transfer such public shares until after the initial business combination. Theodore Koenig FirstName LastNameTheodore Koenig MCAP Acquisition Corp Comapany18, February NameMCAP 2021 Acquisition Corp February Page 2 18, 2021 Page 2 FirstName LastName Exhibit 4.4, page II-5 2. We note the exclusive forum provision in Section 9.3. Please discuss this provision in the prospectus. Exhibit 5.1, page II-5 3. We note the first sentence on page 3 of the opinion which states, "This opinion letter has been prepared for your use solely in connection with the Registration Statement." Please rely to clarify that investors in this offering are entitled to rely upon the opinion. 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 Frank Knapp at 202-551-3805 or Kristina Marrone at 202-551-3429 if you have questions regarding comments on the financial statements and related matters. Please contact Todd Schiffman at 202-551-3491 or James Lopez at 202-551-3536 with any other questions. Sincerely, Division of Corporation Finance Office of Real Estate & Construction