Exhibit 10.1

June 29, 2021

Mountain Crest Acquisition Corp. IV

311 West 43rd Street, 12th Floor

New York, NY 10036

Network 1 Financial Securities, Inc.

2 Bridge Ave #241

Red Bank, NJ 07701

Gentlemen:

This letter is being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”) entered into by and between Mountain Crest Acquisition Corp. IV, a Delaware corporation (the “Company”), and Network 1 Financial Securities, Inc., as Representative (the “Representative”) of the several underwriters named on Schedule A thereto (the “Underwriters”), relating to an underwritten initial public offering (the “IPO”) of the Company’s units (the “Units”), each comprised of one share of common stock of the Company, $0.0001 par value (the “Common Stock”) and one right to receive one-tenth (1/10) of one share of Common Stock (the “Rights”). Certain capitalized terms used herein are defined in paragraph 16 hereof.

In order to induce the Company and the Underwriters to enter into the Underwriting Agreement and to proceed with the IPO, and in recognition of the benefit that such IPO will confer upon the undersigned as a shareholder of the Company, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the undersigned hereby agrees with the Company as follows:

1. If the Company solicits approval of its shareholders of a Business Combination, the undersigned will vote all shares of Common Stock beneficially owned by him, her or it, whether acquired before, in or after the IPO, in favor of such Business Combination.

2. (a) Unless the Company’s shareholders are previously given the option to redeem their shares in connection with amending applicable documents to extend the time that the Company has to complete a Business Combination and the Company fails to consummate a Business Combination within 12 months from the closing of the Company’s IPO (or, in the event that the Company extended the period of time to consummate a business combination up to 18 months from the closing of the Company’s IPO, as specified in the Company’s amended and restated certificate of incorporation), the undersigned shall take all reasonable steps to (i) cause the Trust Fund to be liquidated and distributed to the holders of the IPO Shares and (ii) cause the Company to liquidate as soon as reasonably practicable.

(b) The undersigned hereby waives any and all right, title, interest or claim of any kind in or to any distribution of the Trust Fund and any remaining net assets of the Company as a result of such liquidation with respect to his, her or its Insider Shares including any shares underlying the Private Units (“Claim”) and hereby waives any Claim the undersigned may have in the future as a result of, or arising out of, any contracts or agreements with the Company and will not seek recourse against the Trust Fund for any reason whatsoever. The undersigned acknowledges and agrees that there will be no distribution from the Trust Fund with respect to any Rights underlying the Private Units, all of which will terminate on the Company’s liquidation.

3. In the event of the liquidation of the Trust Fund, Mountain Crest Holdings IV LLC agrees to indemnify and hold harmless the Company against any and all loss, liability, claims, damage and expense whatsoever (including, but not limited to, any and all legal or other expenses reasonably incurred in investigating, preparing or defending against any litigation, whether pending or threatened, or any claim whatsoever) which the Company may become subject as a result of any claim by any target business or vendor or other person who is owed money by the Company for services rendered or products sold or contracted for, but only to the extent necessary to ensure that such loss, liability, claim, damage or expense does not reduce the amount of funds in the Trust Fund; provided that such indemnity shall not apply if such target business, vendor or other person has executed an agreement waiving any claims against the Trust Fund.

4. In the event that the Company does not consummate a Business Combination and must liquidate and its remaining net assets are insufficient to complete such liquidation, Mountain Crest Holdings IV LLC agrees to advance such funds necessary to complete such liquidation and agrees not to seek recourse for such expenses.

5. The undersigned will escrow all of his, her or its Insider Shares pursuant to the terms of a Stock Escrow Agreement, which the Company will enter into with the undersigned and an escrow agent acceptable to the Company. After the underwriter exercises its over-allotment option in full, the remaining portion of the underwriter’s over-allotment option is canceled, or the underwriter’s over-allotment option terminates, the undersigned agrees to cancel a portion of the undersigned’s Insider Shares such that the total number of Insider Shares equals (i) .25 multiplied by (ii) the number of Units sold in the IPO.

6. The undersigned agrees that until the Company consummates a Business Combination, the undersigned’s Private Units will be subject to the transfer restrictions described in the Subscription Agreement relating to the undersigned’s Private Units.

7. In order to minimize potential conflicts of interest which may arise from multiple affiliations, the undersigned agrees to present to the Company for its consideration, prior to presentation to any other person or entity, any suitable opportunity to acquire a target business, until the earlier of the consummation by the Company of a Business Combination or the liquidation of the Company, subject to any pre-existing fiduciary and contractual obligations the undersigned might have.

8. The undersigned acknowledges and agrees that prior to entering into a Business Combination with a target business that is affiliated with any Insiders of the Company or their affiliates, including any company that is a portfolio company of, or otherwise affiliated with, or has received financial investment from, an entity with which any Insider or their affiliates is affiliated, such transaction must be approved by a majority of the Company’s disinterested independent directors and the Company must obtain an opinion from an independent investment banking firm that such Business Combination is fair to the Company’s unaffiliated shareholders from a financial point of view.

9. Neither the undersigned, any member of the family of the undersigned, nor any affiliate of the undersigned will be entitled to receive and will not accept any compensation or other cash payment prior to, or for services rendered in connection with, the consummation of the Business Combination; provided that the Company shall be allowed to repay working capital loans made by the undersigned to the Company in cash upon consummation of the Business Combination. Notwithstanding the foregoing, the undersigned and any affiliate of the undersigned shall be entitled to reimbursement from the Company for their out-of-pocket expenses incurred in connection with identifying, investigating and consummating a Business Combination.

10. Neither the undersigned, any member of the family of the undersigned, nor any affiliate of the undersigned will be entitled to receive or accept a finder’s fee or any other compensation in the event the undersigned, any member of the family of the undersigned or any affiliate of the undersigned originates a Business Combination.

11. Each of the undersigned officers and directors agrees to be a director or officer, as applicable of the Company until the earlier of the consummation by the Company of a Business Combination or the liquidation of the Company. The undersigned’s biographical information previously furnished to the Company and the Representative is true and accurate in all material respects, does not omit any material information with respect to the undersigned’s biography and contains all of the information required to be disclosed pursuant to Item 401 of Regulation S-K, promulgated under the Securities Act of 1933.]³ The FINRA Questionnaire of each of the undersigned officers and directors previously furnished to the Company and the Representative is true and accurate in all material respects. Each of the undersigned represents and warrants that:

12. The undersigned has full right and power, without violating any agreement by which he, she or it is bound, to enter into this letter agreement and to serve as a Director and/or officer of the Company, as applicable.

13. The undersigned hereby waives his, her or its right to exercise redemption rights with respect to any shares of Common Stock owned or to be owned by the undersigned, directly or indirectly, whether purchased by the undersigned prior to the IPO, in the IPO or in the aftermarket, and agrees that he, she or it will not seek redemption with respect to or otherwise sell, such shares in connection with any vote to approve a Business Combination with respect thereto, a vote to amend the provisions of the Company’s Amended and Restated Certificate of Incorporation, or a tender offer by the Company prior to a Business Combination.

14. The undersigned hereby agrees to not propose, or vote in favor of, 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 offers holders of IPO Shares the right to receive their pro rata portion of the funds then held in the Trust Fund.

15. In connection with Section 5-1401 of the General Obligations Law of the State of New York, this letter agreement shall be governed by, and construed in accordance with, the laws of the State of New York without regard to principles of conflicts of law that would result in the application of the substantive law of another jurisdiction. The parties hereto agree that any action, proceeding or claim arising out of or relating in any way to this letter agreement shall be resolved through final and binding arbitration in accordance with the International Arbitration Rules of the American Arbitration Association (“AAA”). The arbitration shall be brought before the AAA International Center for Dispute Resolution’s offices in New York City, New York, will be conducted in English and will be decided by a panel of three arbitrators selected from the AAA Commercial Disputes Panel and that the arbitrator panel’s decision shall be final and enforceable by any court having jurisdiction over the party from whom enforcement is sought. The cost of such arbitrators and arbitration services, together with the prevailing party’s legal fees and expenses, shall be borne by the non-prevailing party or as otherwise directed by the arbitrators.

16. As used herein, (i) a “Business Combination” shall mean a merger, share exchange, asset acquisition, contractual arrangement, share purchase, recapitalization, reorganization or other similar business combination with one or more businesses or entities; (ii) “Insiders” shall mean all officers, directors and shareholders of the Company immediately prior to the IPO; (iii) “Insider Shares” shall mean all of the shares of Common Stock of the Company acquired by an Insider prior to the IPO and any shares of Common Stock underlying the Private Units; (iv) “IPO Shares” shall mean the shares of Common Stock issued in the Company’s IPO; (v) “Private Units” shall mean (x) the Units purchased in the private placement taking place simultaneously with the consummation of the Company’s IPO and (y) the additional Units that may be purchased in connection with the exercise of the over-allotment option by the underwriters in the IPO as described in the Registration Statement; (vi) “Registration Statement” means the registration statement on Form S-1 filed by the Company with respect to the IPO; and (vii) “Trust Fund” shall mean the trust fund into which a portion of the net proceeds of the Company’s IPO will be deposited.

17. Any notice, consent or request to be given in connection with any of the terms or provisions of this letter agreement shall be in writing and shall be sent by express mail or similar private courier service, by certified mail (return receipt requested), by hand delivery or facsimile transmission.

If to the Representative:

Network 1 Financial Securities, Inc.

2 Bridge Ave #241

Red Bank, NJ 07701

Attn: Karen (Huiyun) Mu

Facsimile: (732) 758-6671

with a copy (which copy shall not constitute notice) to:

Ortoli Rosenstadt LLP

366 Madison Ave 3rd floor

New York, NY 10017

Attn: Yarona L. Yieh

Fax No.: (212) 588-0022

If to the Company:

Mountain Crest Acquisition Corp. IV

311 West 43rd Street, 12 Floor

New York, NY 10036

Attn: Suying Liu, Chief Executive Officer

with a copy (which copy shall not constitute notice) to:

Loeb & Loeb LLP 

345 Park Avenue

New York, NY 10154

Attn: Giovanni Caruso, Esq.

Facsimile: (212) 407-4990

18. No party hereto may assign either this letter agreement or any of its rights, interests, or obligations hereunder without the prior written consent of the other party. Any purported assignment in violation of this paragraph shall be void and ineffectual and shall not operate to transfer or assign any interest or title to the purported assignee. This letter agreement shall be binding on the parties hereto and any successors and assigns thereof.

19. The undersigned acknowledges and understands that the Underwriters and the Company will rely upon the agreements, representations and warranties set forth herein in proceeding with the IPO.

[Signature Page Follows]

[SIGNATURE PAGE TO LETTER AGREEMENT]

Exhibit 10.2

INVESTMENT MANAGEMENT TRUST AGREEMENT

This Investment Management Trust Agreement (this “Agreement”) is made as of June 29, 2021 by and between Mountain Crest Acquisition Corp. IV (the “Company”) and Continental Stock Transfer & Trust Company, a New York corporation (the “Trustee”).

WHEREAS, the Company’s registration statement on Form S-1, No. 333-256449 (“Registration Statement”), for its initial public offering of securities (“IPO”) has been declared effective as of the date hereof (“Effective Date”) by the U.S. Securities and Exchange Commission (capitalized terms used herein and not otherwise defined shall have the meanings set forth in the Registration Statement); and

WHEREAS, Network 1 Financial Securities, Inc. (“Network 1”) is acting as the representative of the underwriters in the IPO; and

WHEREAS, simultaneously with the IPO, Mountain Crest Holdings IV LLC will be purchasing up to 195,000 private units (“Private Placement Units”) at $10.00 per private unit.

WHEREAS, as described in the Registration Statement, and in accordance with the Company’s Amended and Restated Certificate of Incorporation, as the same may be amended from time to time (the “Charter”), $50,000,000 of the gross proceeds of the IPO and sale of the Private Placement Units ($57,500,000 if the underwriters’ over-allotment option is exercised in full) will be delivered to the Trustee to be deposited and held in a segregated trust account located at all times in the United States (the “Trust Account”) for the benefit of the Company and the holders of the Company’s shares of common stock, par value $0.0001 per share (“Common Stock”), issued in the IPO as hereinafter provided (the amount to be delivered to the Trustee will be referred to herein as the “Property”; the shareholders for whose benefit the Trustee shall hold the Property will be referred to as the “Public Shareholders,” and the Public Shareholders and the Company will be referred to together as the “Beneficiaries”); and

WHEREAS, pursuant to the Underwriting Agreement, a portion of the Property equal to $1,500,000, or $1,725,000 if the underwriters’ over-allotment option is exercised in full, is attributable to deferred underwriting discounts and commissions that may become payable by the Company to the underwriters upon the consummation of an initial business combination (as described in the Registration Statement, a “Business Combination”) (the “Deferred Discount”); and

WHEREAS, the Company and the Trustee desire to enter into this Agreement to set forth the terms and conditions pursuant to which the Trustee shall hold the Property.

IT IS AGREED:

1. Agreements and Covenants of Trustee. The Trustee hereby agrees and covenants to:

(a) Hold the Property in trust for the Beneficiaries in accordance with the terms of this Agreement in a segregated trust account (“Trust Account”) established by the Trustee in the United States at JPMorgan Chase Bank, maintained by Trustee, and at a brokerage institution selected by the Trustee that is reasonably satisfactory to the Company;

(b) Manage, supervise and administer the Trust Account subject to the terms and conditions set forth herein;

(c) In a timely manner, upon the instruction of the Company, invest and reinvest the Property (i) [in United States government treasury bills, notes or bonds having a maturity of 180 days or less and/or (ii) in money market funds meeting certain conditions under Rule 2a-7 promulgated under the Investment Company Act of 1940, as amended, and that invest solely in U.S. treasuries, as determined by the Company; it being understood that the Trust Account will earn no interest while account funds are uninvested awaiting the Company’s instructions hereunder and that Trustee may earn bank credits or other consideration;

(d) Collect and receive, when due, all principal and income arising from the Property, which shall become part of the “Property,” as such term is used herein;

(e) Notify the Company and the Underwriters of all communications received by it with respect to any Property requiring action by the Company;

(f) Supply any necessary information or documents as may be requested by the Company in connection with the Company’s preparation of its tax returns;

(g) Participate in any plan or proceeding for protecting or enforcing any right or interest arising from the Property if, as and when instructed by the Company to do so;

(h) Render to the Company monthly written statements of the activities of and amounts in the Trust Account reflecting all receipts and disbursements of the Trust Account; and

(i) Commence liquidation of the Trust Account only after and promptly after receipt of, and only in accordance with, the terms of a letter (“Termination Letter”), in a form substantially similar to that attached hereto as either Exhibit A or Exhibit B, signed on behalf of the Company by its President, Chief Executive Officer or Chairman of the Board and Secretary or Assistant Secretary and, in the case of a Termination Letter in a form substantially similar to that attached hereto as Exhibit A, acknowledged and agreed to by Network 1, and complete the liquidation of the Trust Account and distribute the Property in the Trust Account only as directed in the Termination Letter and the other documents referred to therein; provided, however, that in the event that a Termination Letter has not been received by the Trustee by the 12-month anniversary of the closing of the IPO (“Closing”) or, in the event that the Company extended the time to complete the Business Combination for up to 18 months from the closing of the IPO but has not completed the Business Combination within such 18-month period, the 18 month anniversary of the Closing (as applicable, the “Last Date”), the Trust Account shall be liquidated in accordance with the procedures set forth in the Termination Letter attached as Exhibit B hereto and distributed to the Public Shareholders as of the Last Date.

(j) Upon receipt of an extension letter (“Extension Letter”) substantially similar to Exhibit D hereto at least five business days prior to the Applicable Deadline, signed on behalf of the Company by an executive officer, and receipt of the dollar amount specified in the Extension Letter on or prior to the Applicable Deadline, to follow the instructions set forth in the Extension Letter.

(k) Upon receipt of a letter (an “Amendment Notification Letter”) in the form of Exhibit E, signed on behalf of the Company by its Chief Executive Officer and Chief Financial Officer and, distribute to Public Stockholders who exercised their conversion rights in connection with an amendment to the Company’s amended and restated certificate of incorporation (an “Amendment”) an amount equal to the pro rata share of the Property relating to the Common Stock for which such Public Stockholders have exercised conversion/redemption rights in connection with such Amendment.

(l) Not disburse any amounts from the Trust Account in connection with a Business Combination in the event that the amount per share to be received by the redeeming Public Shareholders is less than $10.00 per share (plus the amount per share deposited in the Trust Account pursuant to any Extension Letter).

(m) In connection with a Business Combination, before making disbursements to the Depository Trust Company, the Company or any other person, disburse the per share amount to redeeming Public Shareholders (other than shares tendered through the Depository Trust Company) that have tendered their shares directly to the Trustee.

2. Limited Distributions of Income from Trust Account.

(a) Upon written request from the Company, which may be given from time to time in a form substantially similar to that attached hereto as Exhibit C, the Trustee shall distribute to the Company the amount of interest income earned on the Trust Account requested by the Company to cover any income or other tax obligation owed by the Company.

(b) The limited distributions referred to in Section 2(a) above shall be made only from income collected on the Property. Except as provided in Section 2(a), no other distributions from the Trust Account shall be permitted except in accordance with Section 1(i) hereof.

(c) The Company shall provide the Underwriters with a copy of any Termination Letters and/or any other correspondence that it issues to the Trustee with respect to any proposed withdrawal from the Trust Account promptly after such issuance.

(d) If applicable, the Company shall issue a press release at least three days prior to the Applicable Deadline announcing that, at least five days prior to the Applicable Deadline, the Company received notice from the Company’s insiders that the insiders intend to extend the Applicable Deadline.

(e) Promptly following the Applicable Deadline, disclose whether or not the term the Company has to consummate a Business Combination has been extended.

3. Agreements and Covenants of the Company. The Company hereby agrees and covenants to:

(a) Give all instructions to the Trustee hereunder in writing, signed by the Company’s Chairman of the Board, Chief Executive Officer or Chief Financial Officer. In addition, except with respect to its duties under paragraphs 1(i), 2(a) and 2(b) above, the Trustee shall be entitled to rely on, and shall be protected in relying on, any verbal or telephonic advice or instruction which it in good faith believes to be given by any one of the persons authorized above to give written instructions, provided that the Company shall promptly confirm such instructions in writing.

(b) Subject to the provisions of Sections 5 and 7(g) of this Agreement, hold the Trustee harmless and indemnify the Trustee from and against, any and all expenses, including reasonable counsel fees and disbursements, or loss suffered by the Trustee in connection with any claim, potential claim, action, suit or other proceeding brought against the Trustee involving any claim, or in connection with any claim or demand which in any way arises out of or relates to this Agreement, the services of the Trustee hereunder, or the Property or any income earned from investment of the Property, except for expenses and losses resulting from the Trustee’s gross negligence or willful misconduct. Promptly after the receipt by the Trustee of notice of demand or claim or the commencement of any action, suit or proceeding, pursuant to which the Trustee intends to seek indemnification under this paragraph, it shall notify the Company in writing of such claim (hereinafter referred to as the “Indemnified Claim”); provided, however, that the Trustee’s failure to provide such notice shall not relieve the Company of its liability hereunder, except to the extent that it is materially prejudiced by such failure. The Trustee shall have the right to conduct and manage the defense against such Indemnified Claim, provided, that the Trustee shall obtain the consent of the Company with respect to the selection of counsel, which consent shall not be unreasonably withheld. The Trustee may not agree to settle any Indemnified Claim without the prior written consent of the Company, which consent shall not be unreasonably withheld or delayed. The Company may participate in such action with its own counsel.

(c) Pay the Trustee an initial acceptance fee, an annual fee and a transaction processing fee for each disbursement made pursuant to Sections 2(a) and 2(b) as set forth on Schedule A hereto, which fees shall be subject to modification by the parties from time to time. It is expressly understood that the Property shall not be used to pay such fees and further agreed that any fees owed to the Trustee shall be deducted by the Trustee from the disbursements made to the Company pursuant to Sections 1(i) solely in connection with the consummation of the Company’s initial acquisition, share exchange, share reconstruction and amalgamation, purchase of all or substantially all of the assets of, or any other similar business combination with one or more businesses or entities (a “Business Combination”), or pursuant to Section 2 (b). The Company shall pay the Trustee the initial acceptance fee and first year’s fee at the consummation of the IPO and thereafter on the anniversary of the Effective Date.

(d) In connection with any vote of the Company’s shareholders regarding a Business Combination, provide to the Trustee an affidavit or certificate of a firm regularly engaged in the business of soliciting proxies and/or tabulating shareholder votes verifying the vote of the Company’s shareholders regarding such Business Combination.

(e) In the event that the Company directs the Trustee to commence liquidation of the Trust Account pursuant to Section 1(i), the Company agrees that it will not direct the Trustee to make any payments that are not specifically authorized by this Agreement.

4. Limitations of Liability. The Trustee shall have no responsibility or liability to:

(a) Take any action with respect to the Property, other than as directed in paragraphs 1 and 2 hereof and the Trustee shall have no liability to any party except for liability arising out of its own gross negligence or willful misconduct;

(b) Institute any proceeding for the collection of any principal and income arising from, or institute, appear in or defend any proceeding of any kind with respect to, any of the Property unless and until it shall have received instructions from the Company given as provided herein to do so and the Company shall have advanced or guaranteed to it funds sufficient to pay any expenses incident thereto;

(c) Change the investment of any Property, other than in compliance with paragraph 1(c);

(d) Refund any depreciation in principal of any Property;

(e) Assume that the authority of any person designated by the Company to give instructions hereunder shall not be continuing unless provided otherwise in such designation, or unless the Company shall have delivered a written revocation of such authority to the Trustee;

(f) The other parties hereto or to anyone else for any action taken or omitted by it, or any action suffered by it to be taken or omitted, in good faith and in the exercise of its own best judgment, except for its gross negligence or willful misconduct. The Trustee may rely conclusively and shall be protected in acting upon any order, notice, demand, certificate, opinion or advice of counsel (including counsel chosen by the Trustee), statement, instrument, report or other paper or document (not only as to its due execution and the validity and effectiveness of its provisions, but also as to the truth and acceptability of any information therein contained) which is believed by the Trustee, in good faith, to be genuine and to be signed or presented by the proper person or persons. The Trustee shall not be bound by any notice or demand, or any waiver, modification, termination or rescission of this Agreement or any of the terms hereof, unless evidenced by a written instrument delivered to the Trustee signed by the proper party or parties and, if the duties or rights of the Trustee are affected, unless it shall give its prior written consent thereto;

(g) Verify the correctness of the information set forth in the Registration Statement or to confirm or assure that any acquisition made by the Company or any other action taken by it is as contemplated by the Registration Statement;

(h) File local, state and/or federal tax returns or information returns with any taxing authority on behalf of the Trust Account and payee statements with the Company documenting the taxes, if any, payable by the Company or the Trust Account, relating to the income earned on the Property;

(i) Pay any taxes on behalf of the Trust Account (it being expressly understood that the Property shall not be used to pay any such taxes and that such taxes, if any, shall be paid by the Company from funds not held in the Trust Account or released to it under Section 2(a) hereof);

(j) Imply obligations, perform duties, inquire or otherwise be subject to the provisions of any agreement or document other than this agreement and that which is expressly set forth herein; and

(k) Verify calculations, qualify or otherwise approve Company requests for distributions pursuant to Section 1(i), 2(a) or 2(b) above.

5. Trust Account Waiver. The Trustee has no right of set-off or any right, title, interest or claim of any kind (“Claim”) to, or to any monies in, the Trust Account, and hereby irrevocably waives any Claim to, or to any monies in, the Trust Account that it may have now or in the future. In the event the Trustee has any Claim against the Company under this Agreement, including, without limitation, under Section 3(b) or Section 3(c) hereof, the Trustee shall pursue such Claim solely against the Company and its assets outside the Trust Account and not against the Property or any monies in the Trust Account.

6. Termination. This Agreement shall terminate as follows:

(a) If the Trustee gives written notice to the Company that it desires to resign under this Agreement, the Company shall use its reasonable efforts to locate a successor trustee during which time the Trustee shall act in accordance with this Agreement. At such time that the Company notifies the Trustee that a successor trustee has been appointed by the Company and has agreed to become subject to the terms of this Agreement, the Trustee shall transfer the management of the Trust Account to the successor trustee, including but not limited to the transfer of copies of the reports and statements relating to the Trust Account, whereupon this Agreement shall terminate; provided, however, that, in the event that the Company does not locate a successor trustee within ninety days of receipt of the resignation notice from the Trustee, the Trustee may submit an application to have the Property deposited with any court in the State of New York or with the United States District Court for the Southern District of New York and upon such deposit, the Trustee shall be immune from any liability whatsoever; or

(b) At such time that the Trustee has completed the liquidation of the Trust Account in accordance with the provisions of paragraph 1(i) hereof, and distributed the Property in accordance with the provisions of the Termination Letter, this Agreement shall terminate except with respect to Paragraph 3(b).

7. Miscellaneous.

(a) The Company and the Trustee each acknowledge that the Trustee will follow the security procedures set forth below with respect to funds transferred from the Trust Account. The Company and the Trustee will each restrict access to confidential information relating to such security procedures to authorized persons. Each party must notify the other party immediately if it has reason to believe unauthorized persons may have obtained access to such information, or of any change in its authorized personnel. In executing funds transfers, the Trustee will rely upon all information supplied to it by the Company, including account names, account numbers and all other identifying information relating to a beneficiary, beneficiary’s bank or intermediary bank. The Trustee shall not be liable for any loss, liability or expense resulting from any error in the information or transmission of the wire.

(b) This Agreement shall be governed by and construed and enforced in accordance with the laws of the State of New York, without giving effect to conflicts of law principles that would result in the application of the substantive laws of another jurisdiction. It may be executed in several original or facsimile counterparts, each one of which shall constitute an original, and together shall constitute but one instrument.

(c) This Agreement contains the entire agreement and understanding of the parties hereto with respect to the subject matter hereof. Except for Sections 1(i), 1(k), 1(l), 1(m), 1(n), 3(g), 7(c) and 7(h) (which may only be amended with the approval of the holders of at least 50% of the shares of common stock sold in the IPO, provided that all Public Shareholders must be given the right to receive a pro-rata portion of the trust account (no less than $10.00 per share plus the amount per share deposited in the Trust Account pursuant to any Extension Letter) in connection with any such amendment), this Agreement or any provision hereof may only be changed, amended or modified by a writing signed by each of the parties hereto; provided, however, that no such change, amendment or modification may be made without the prior written consent of the Underwriters. As to any claim, cross-claim or counterclaim in any way relating to this Agreement, each party waives the right to trial by jury. The Trustee may require from Company counsel an opinion as to the propriety of any proposed amendment.

(d) The parties hereto consent to the jurisdiction and venue of any state or federal court located in the City of New York, Borough of Manhattan, for purposes of resolving any disputes hereunder.

(e) Any notice, consent or request to be given in connection with any of the terms or provisions of this Agreement shall be in writing and shall be sent by express mail or similar private courier service, by certified mail (return receipt requested), by hand delivery or by facsimile transmission:

if to the Trustee, to:

Continental Stock Transfer & Trust Company
1 State Street
New York, New York 10004
Attention: Francis Wolf

if to the Company, to:

Mountain Crest Acquisition Corp. IV
311 West 43rd Street, 12th Floor
New York, NY 10036
Attn: Suying Liu

in either case with a copy (which copy shall not constitute notice) to:

Network 1 Financial Securities, Inc.

2 Bridge Ave #241

Red Bank, NJ 07701

Attn: Karen (Huiyun) Mu

and:

Loeb & Loeb LLP
345 Park Avenue
New York, NY 10154
Attn: Giovanni Caruso
Fax No.: (212) 937-3943

and:

Ortoli Rosenstadt LLP

366 Madison Ave 3rd floor

New York, NY 10017

Attn: Yarona L. Yieh

(f) This Agreement may not be assigned by the Trustee without the prior consent of the Company.

(g) Each of the Trustee and the Company hereby represents that it has the full right and power and has been duly authorized to enter into this Agreement and to perform its respective obligations as contemplated hereunder. The Trustee acknowledges and agrees that it shall not make any claims or proceed against the Trust Account, including by way of set-off, and shall not be entitled to any funds in the Trust Account under any circumstance.

(h) This Agreement is the joint product of the Company and the Trustee and each provision hereof has been subject to the mutual consultation, negotiation and agreement of such parties and shall not be construed for or against any party hereto.

(i) This Agreement may be executed in any number of counterparts, each of which shall be deemed to be an original, but all such counterparts shall together constitute one and the same instrument. Delivery of a signed counterpart of this Agreement by facsimile or electronic transmission shall constitute valid and sufficient delivery thereof.

(j) Each of the Company and the Trustee hereby acknowledge that the Underwriters are a third party beneficiary of this Agreement and that each Public Shareholder is a third party beneficiary of Sections 1(i), 1(k), 1(l), 3(g), 3(h) and 7(c).

(k) Except as specified herein, no party to this Agreement may assign its rights or delegate its obligations hereunder to any other person or entity.

IN WITNESS WHEREOF, the parties have duly executed this Investment Management Trust Agreement as of the date first written above.

EXHIBIT A

[Letterhead of Company]

[Insert date]

Continental Stock Transfer & Trust Company
1 State Street
New York, New York 10004
Attention: [Francis Wolf]

___________:

Pursuant to paragraph 1(i) of the Investment Management Trust Agreement between Mountain Crest Acquisition Corp. IV (“Company”) and Continental Stock Transfer & Trust Company (“Trustee”), dated as of [*], 2021 (“Trust Agreement”), this is to advise you that the Company has entered into an agreement with [___________] (“Target Business”) to consummate a business combination with Target Business (“Business Combination”) on or about [insert date]. The Company shall notify you at least [72 hours] in advance of the actual date of the consummation of the Business Combination (“Consummation Date”). Capitalized terms used herein and not otherwise defined shall have the meanings set forth in the Trust Agreement.

In accordance with the terms of the Trust Agreement, we hereby authorize you to liquidate the Trust Account investments on [___] and to transfer the proceeds to the above-referenced account at [______] to the effect that, on the Consummation Date, all of funds held in the Trust Account will be immediately available for transfer to the account or accounts that the Company shall direct on the Consummation Date. It is acknowledged and agreed that while the funds are on deposit in the trust account awaiting distribution, the Company will not earn any interest or dividends.

On the Consummation Date (i) counsel for the Company shall deliver to you written notification that the Business Combination has been consummated, and (ii) the Company shall deliver to you (a) [an affidavit] [a certificate] of [______], which verifies the vote of the Company’s shareholders in connection with the Business Combination if a vote is held and (b) joint written instructions from the Company and Network 1 Financial Securities, Inc. with respect to the transfer of the funds held in the Trust Account, which must provide for the disbursement of no less than $10.00 per share plus the amount per share deposited in the Trust Account per Extension Letter to redeeming Public Shareholders (“Instruction Letter”). You are hereby directed and authorized to transfer the funds held in the Trust Account immediately upon your receipt of the counsel’s letter and the Instruction Letter, in accordance with the terms of the Instruction Letter. In the event that certain deposits held in the Trust Account may not be liquidated by the Consummation Date without penalty, you will notify the Company of the same and the Company shall direct you as to whether such funds should remain in the Trust Account and distributed after the Consummation Date to the Company. Upon the distribution of all the funds in the Trust Account pursuant to the terms hereof, the Trust Agreement shall be terminated.

In the event that the Business Combination is not consummated on the Consummation Date described in the notice thereof and we have not notified you on or before the original Consummation Date of a new Consummation Date, then upon receipt by the Trustee of written instructions from the Company, the funds held in the Trust Account shall be reinvested as provided in the Trust Agreement on the business day immediately following the Consummation Date as set forth in the notice.

Acknowledged and Agreed:

Network 1 Financial Securities, Inc.

EXHIBIT B

[Letterhead of Company]

[Insert date]

Continental Stock Transfer & Trust Company
1 State Street
New York, New York 10004
Attention: [Francis Wolf]

___________:

Pursuant to paragraph 1(i) of the Investment Management Trust Agreement between Mountain Crest Acquisition Corp. IV (“Company”) and Continental Stock Transfer & Trust Company (“Trustee”), dated as of [*], 2021 (“Trust Agreement”), this is to advise you that the Company has been unable to effect a Business Combination with a Target Company within the time frame specified in the Company’s Amended and Restated Certificate of Incorporation, as described in the Company’s prospectus relating to its IPO. Capitalized terms used herein and not otherwise defined shall have the meanings set forth in the Trust Agreement.

In accordance with the terms of the Trust Agreement, we hereby authorize you to liquidate all the Trust Account investments on [____] and to transfer the total proceeds to the Trust Checking Account at [_____] to await distribution to the Public Shareholders. The Company has selected [___, 20 ] as the record date for the purpose of determining the Public Shareholders entitled to receive their share of the liquidation proceeds. It is acknowledged that no interest will be earned by the Company on the liquidation proceeds while on deposit in the Trust Checking Account. You agree to be the Paying Agent of record and in your separate capacity as Paying Agent, to distribute said funds directly to the Public Shareholders in accordance with the terms of the Trust Agreement and the Amended and Restated Certificate of Incorporation of the Company. Upon the distribution of all the funds in the Trust Account, your obligations under the Trust Agreement shall be terminated.

EXHIBIT C

[Letterhead of Company]

[Insert date]

Continental Stock Transfer & Trust Company
1 State Street
New York, New York 10004
Attention: [Francis Wolf]

___________:

Pursuant to paragraph 2(a) of the Investment Management Trust Agreement between Mountain Crest Acquisition Corp. IV (“Company”) and Continental Stock Transfer & Trust Company, LLC (“Trustee”), dated as of [*], 2021 (“Trust Agreement”), the Company hereby requests that you deliver to the Company [$       ] of the interest income earned on the Property as of the date hereof. The Company needs such funds to pay for its tax obligations. In accordance with the terms of the Trust Agreement, you are hereby directed and authorized to transfer (via wire transfer) such funds promptly upon your receipt of this letter to the Company’s operating account at:

[WIRE INSTRUCTION INFORMATION]

EXHIBIT D

[Letterhead of Company]

[Insert date]

Continental Stock Transfer & Trust Company
1 State Street
New York, New York 10004
Attention: Francis Wolf

Gentlemen:

Pursuant to Section 1(l) of the Investment Management Trust Agreement between Mountain Crest Acquisition Corp. IV (“Company”) and Continental Stock Transfer & Trust Company, dated as of [*], 2021 (“Trust Agreement”), this is to advise you that the Company is extending the time available in order to consummate a Business Combination with the Target Businesses for an additional [three (3) months], from ______________ to ____________ (the “Extension”).

This Extension Letter shall serve as the notice required with respect to Extension prior to the Applicable Deadline. Capitalized words used herein and not otherwise defined shall have the meanings ascribed to them in the Trust Agreement.

[In accordance with the terms of the Trust Agreement, we hereby authorize you to deposit [$500,000] [(or $575,000 if the underwriters’ over-allotment option was exercised in full)], which will be wired to you, into the Trust Account investments upon receipt.][Pursuant to our amended and restated certificate of incorporation, we have entered into a definitive agreement for a Business combination within 12 months of the closing of our IPO and our time to complete a Business Combination, as evidenced by the press release attached hereto that the Company released on _________, 20___.]

EXHIBIT E

[Letterhead of Company]

[Insert date]

Continental Stock Transfer & Trust Company
1 State Street
New York, New York 10004
Attention: Francis Wolf

___________:

Reference is made to that certain Investment Management Trust Agreement between Mountain Crest Acquisition Corp. IV (“Company”) and Continental Stock Transfer & Trust Company, dated as of [*], 2021 (“Trust Agreement”). Capitalized words used herein and not otherwise defined shall have the meanings ascribed to them in the Trust Agreement.

Pursuant to Section 1(k) of the Trust Agreement, this is to advise you that the Company has sought an Amendment. Accordingly, in accordance with the terms of the Trust Agreement, we hereby authorize you to liquidate a sufficient portion of the Trust Account and to transfer $           of the proceeds of the Trust to the account at [              ] for distribution to the stockholders that have requested conversion of their shares in connection with such Amendment. The remaining funds shall be reinvested by you as previously instructed.

Exhibit 10.3

STOCK ESCROW AGREEMENT

This STOCK ESCROW AGREEMENT, dated as of June 29, 2021 (“Agreement”), by and among MOUNTAIN CREST ACQUISITION CORP. IV, a Delaware corporation (“Company”), and the initial shareholders listed on the signature pages hereto (collectively, the “Initial Shareholders”) CONTINENTAL STOCK TRANSFER & TRUST COMPANY, a limited purpose trust company (“Escrow Agent”).

WHEREAS, the Company has entered into an Underwriting Agreement, dated as of June 29, 2021 (“Underwriting Agreement”), with Network 1 Financial Securities, Inc. (“Network 1”) acting as representative of the several underwriters (collectively, the “Underwriters”), pursuant to which, among other matters, the Underwriters have agreed to purchase 5,000,000 units (“Units”) of the Company, plus an additional 750,000 Units if the Underwriters exercise their over-allotment option in full. Each Unit consists of one share of common stock of the Company, par value $0.0001 per share (the “Common Stock”) and one right to receive one-tenth (1/10) of a share of common stock upon the consummation of an initial business combination, all as more fully described in the Company’s final Prospectus, dated July 1, 2021 (“Prospectus”), comprising part of the Company’s Registration Statement on Form S-1 (File No. 333-256449) under the Securities Act of 1933, as amended (“Registration Statement”), declared effective on June 29, 2021 (“Effective Date”).

WHEREAS, the Initial Shareholders have agreed as a condition of the sale of the Units to deposit their Insider Shares (as defined in the Prospectus), as set forth opposite their respective names on Exhibit A attached hereto (collectively “Escrow Shares”), in escrow as hereinafter provided.

WHEREAS, the Company and the Initial Shareholders desire that the Escrow Agent accept the Escrow Shares, in escrow, to be held and disbursed as hereinafter provided.

IT IS AGREED:

1. Appointment of Escrow Agent. The Company and the Initial Shareholders hereby appoint the Escrow Agent to act in accordance with and subject to the terms of this Agreement and the Escrow Agent hereby accepts such appointment and agrees to act in accordance with and subject to such terms.

2. Deposit of Escrow Shares. On or prior to the date hereof, each of the Initial Shareholders delivered to the Escrow Agent certificates representing such Initial Shareholder’s respective Escrow Shares, together with applicable share powers, to be held and disbursed subject to the terms and conditions of this Agreement. Each of the Initial Shareholders acknowledges that the certificate representing such Initial Shareholder’s Escrow Shares is legended to reflect the deposit of such Escrow Shares under this Agreement.

3. Disbursement of the Escrow Shares.

3.1 The Escrow Agent shall hold the Escrow Shares during the period (the “Escrow Period”) commencing on the date hereof and (i) for 50% of the Escrow Shares, ending on the earlier of (x) six months after the date of the consummation of the Company’s initial business combination (as described in the Registration Statement, hereinafter a “Business Combination”) and (y) the date on which the closing price of the Common Stock equals or exceeds $12.50 per share (as adjusted for stock splits, stock dividends, reorganizations and recapitalizations) for any 20 trading days within any 30-trading day period commencing after the Company’s initial Business Combination and (ii) for the remaining 50% of the Escrow Shares, ending six months after the date of the consummation of an initial Business Combination. The Company shall promptly provide notice of the consummation of a Business Combination to the Escrow Agent. Upon completion of the Escrow Period, the Escrow Agent shall disburse such amount of each Initial Shareholder’s Escrow Shares (and any applicable share power) to such Initial Shareholder; provided, however, that if the Escrow Agent is notified by the Company pursuant to Section 6.7 hereof that the Company is being liquidated at any time during the Escrow Period, then the Escrow Agent shall promptly destroy the certificates representing the Escrow Shares; provided further, however, that if, within six months after the Company consummates an initial Business Combination, the Company (or the surviving entity) subsequently consummates a liquidation, merger, stock exchange or other similar transaction which results in all of the shareholders of such entity having the right to exchange their shares of Common Stock for cash, securities or other property, then the Escrow Agent will, upon receipt of a notice executed by the Chairman of the Board, Chief Executive Officer or other authorized officer of the Company, in form reasonably acceptable to the Escrow Agent, certifying that such transaction is then being consummated or such conditions have been achieved, as applicable, release the Escrow Shares to the Initial Shareholders. The Escrow Agent shall have no further duties hereunder after the disbursement or destruction of the Escrow Shares in accordance with this Section 3.1.

3.2 Notwithstanding Section 3.1, if the Underwriters do not exercise their over-allotment option to purchase an additional 750,000 Units of the Company in full within 45 days of the date of the Prospectus (as described in the Underwriting Agreement), the Initial Shareholders agree that the Escrow Agent shall return to the Company for cancellation, at no cost, the number of Escrow Shares held by the Initial Shareholders listed on Exhibit B determined by multiplying (a) the product of (i) 187,500 multiplied by (ii) a fraction, (x) the numerator of which is the number of Escrow Shares held by each such holder, and (y) the denominator of which is the total number of Escrow Shares, by (b) a fraction, (i) the numerator of which is 750,000 minus the number of shares of Common Stock purchased by the Underwriters upon the exercise of their over-allotment option, and (ii) the denominator of which is 750,000. The Company shall promptly provide notice to the Escrow Agent of the expiration or termination of the Underwriters’ over-allotment option and the number of Units, if any, purchased by the Underwriters in connection with their exercise thereof.

4. Rights of Initial Shareholders in Escrow Shares.

4.1 Voting Rights as a Shareholder. Subject to the terms of the Insider Letters described in Section 4.4 hereof and except as herein provided, the Initial Shareholders shall retain all of their rights as shareholders of the Company during the Escrow Period, including, without limitation, the right to vote such shares.

4.2 Dividends and Other Distributions in Respect of the Escrow Shares. During the Escrow Period, all dividends payable in cash with respect to the Escrow Shares shall be paid to the Initial Shareholders, but all dividends payable in stock or other non-cash property (“Non-Cash Dividends”) shall be delivered to the Escrow Agent to hold in accordance with the terms hereof. As used herein, the term “Escrow Shares” shall be deemed to include the Non-Cash Dividends distributed thereon, if any.

4.3 Restrictions on Transfer. During the Escrow Period, the only permitted transfers of the Escrow Shares will be (1) to the Company’s pre-IPO stockholders or their respective affiliates, or to the Company’s offices, directors, advisors and employees, (2) if the Initial Shareholder is an entity, as a distribution to its, partners, stockholders or members upon its liquidation, (3) by bona fide gift to a member of the Initial Shareholder’s immediate family or to a trust, the beneficiary of which is the Initial Shareholder or a member of the Initial Shareholder’s immediate family for estate planning purposes, (4) by virtue of the laws of descent and distribution upon death of the Initial Shareholder, (5) pursuant to a qualified domestic relations order, (6) by certain pledges to secure obligations incurred in connection with purchases of the Company’s securities, (7) by private sales at prices no greater than the price at which the Insider Shares were originally purchased or (8) for the cancellation of up to 187,500 shares of Common Stock subject to forfeiture to the extent that the Underwriters’ over-allotment is not exercised in full or in part or in connection with the consummation of our initial Business Combination, in each case (except for clause 8 or with our prior consent) on the condition that such transfers may be implemented only upon the respective transferee’s written agreement to be bound by the terms and conditions of this Agreement and of the Insider Letter (as defined below) signed by the Initial Shareholder transferring the Escrow Shares.

4.4 Insider Letters. Each of the Initial Shareholders has executed a letter agreement with Network 1 and the Company, dated as indicated on Exhibit C hereto, and the form of which is filed as an exhibit to the Registration Statement (“Insider Letter”), respecting the rights and obligations of such Initial Shareholder in certain events, including but not limited to the liquidation of the Company.

5. Concerning the Escrow Agent.

5.1 Good Faith Reliance. The Escrow Agent shall not be liable for any action taken or omitted by it in good faith and in the exercise of its own best judgment, and may rely conclusively and shall be protected in acting upon any order, notice, demand, certificate, opinion or advice of counsel (including counsel chosen by the Escrow Agent), statement, instrument, report or other paper or document (not only as to its due execution and the validity and effectiveness of its provisions, but also as to the truth and acceptability of any information therein contained) which is believed by the Escrow Agent to be genuine and to be signed or presented by the proper person or persons. The Escrow Agent shall not be bound by any notice or demand, or any waiver, modification, termination or rescission of this Agreement unless evidenced by a writing delivered to the Escrow Agent signed by the proper party or parties and, if the duties or rights of the Escrow Agent are affected, unless it shall have given its prior written consent thereto.

5.2 Indemnification. The Escrow Agent shall be indemnified and held harmless by the Company from and against any expenses, including counsel fees and disbursements, or loss suffered by the Escrow Agent in connection with any action, suit or other proceeding involving any claim which in any way, directly or indirectly, arises out of or relates to this Agreement, the services of the Escrow Agent hereunder, or the Escrow Shares held by it hereunder, other than expenses or losses arising from the gross negligence or willful misconduct of the Escrow Agent. Promptly after the receipt by the Escrow Agent of notice of any demand or claim or the commencement of any action, suit or proceeding, the Escrow Agent shall notify the other parties hereto in writing. In the event of the receipt of such notice, the Escrow Agent, in its sole discretion, may commence an action in the nature of interpleader in an appropriate court to determine ownership or disposition of the Escrow Shares or it may deposit the Escrow Shares with the clerk of any appropriate court or it may retain the Escrow Shares pending receipt of a final, non-appealable order of a court having jurisdiction over all of the parties hereto directing to whom and under what circumstances the Escrow Shares are to be disbursed and delivered. The provisions of this Section 5.2 shall survive in the event the Escrow Agent resigns or is discharged pursuant to Sections 5.5 or 5.6 below.

5.3 Compensation. The Escrow Agent shall be entitled to reasonable compensation from the Company for all services rendered by it hereunder. The Escrow Agent shall also be entitled to reimbursement from the Company for all expenses paid or incurred by it in the administration of its duties hereunder including, but not limited to, all counsel, advisors’ and agents’ fees and disbursements and all taxes or other governmental charges.

5.4 Further Assurances. From time to time on and after the date hereof, the Company and the Initial Shareholders shall deliver or cause to be delivered to the Escrow Agent such further documents and instruments and shall do or cause to be done such further acts as the Escrow Agent shall reasonably request to carry out more effectively the provisions and purposes of this Agreement, to evidence compliance herewith or to assure itself that it is protected in acting hereunder.

5.5 Resignation. The Escrow Agent may resign at any time and be discharged from its duties as escrow agent hereunder by its giving the other parties hereto written notice and such resignation shall become effective as hereinafter provided. Such resignation shall become effective at such time that the Escrow Agent shall turn over, to a successor escrow agent appointed by the Company, the Escrow Shares held hereunder. If no new escrow agent is so appointed within the 60-day period following the giving of such notice of resignation, the Escrow Agent may deposit the Escrow Shares with any court it reasonably deems appropriate.

5.6 Discharge of Escrow Agent. The Escrow Agent shall resign and be discharged from its duties as escrow agent hereunder if so requested in writing at any time by the other parties hereto, jointly, provided, however, that such resignation shall become effective only upon acceptance of appointment by a successor escrow agent as provided in Section 5.5.

5.7 Liability. Notwithstanding anything herein to the contrary, the Escrow Agent shall not be relieved from liability hereunder for its own gross negligence or its own willful misconduct.

5.8 Waiver. The Escrow Agent hereby waives any right of set-off or any other right, title, interest or claim of any kind (“Claim”) in, or to any distribution of, the Trust Account (as defined in that certain Investment Management Trust Agreement, dated as of the date hereof, by and between the Company and the Escrow Agent as trustee thereunder) and hereby agrees not to seek recourse, reimbursement, payment or satisfaction for any Claim against the Trust Account for any reason whatsoever.

6. Miscellaneous.

6.1 Governing Law. This Agreement shall for all purposes be deemed to be made under and shall be construed in accordance with the laws of the State of New York, without giving effect to conflicts of law principles that would result in the application of the substantive laws of another jurisdiction.

6.2 Third Party Beneficiaries. Each of the Initial Shareholders hereby acknowledges that Network 1 is a third-party beneficiary of this Agreement and this Agreement may not be modified or changed without the prior written consent of Network 1.

6.3 Entire Agreement. This Agreement contains the entire agreement of the parties hereto with respect to the subject matter hereof and, except as expressly provided herein, may not be changed or modified except by an instrument in writing signed by the party to the charged.

6.4 Headings. The headings contained in this Agreement are for reference purposes only and shall not affect in any way the meaning or interpretation thereof.

6.5 Binding Effect. This Agreement shall be binding upon and inure to the benefit of the respective parties hereto and their legal representatives, successors and assigns.

6.6 Notices. Any notice or other communication required or which may be given hereunder shall be in writing and either be delivered personally or be mailed, certified or registered mail, or by private national courier service, return receipt requested, postage prepaid, and shall be deemed given when so delivered personally or, if mailed, two days after the date of mailing, as follows:

If to a Shareholder, to his address set forth in Exhibit A.

A copy (which copy shall not constitute notice) sent hereunder shall be sent to:

The parties may change the persons and addresses to which the notices or other communications are to be sent by giving written notice to any such change in the manner provided herein for giving notice.

6.7 Liquidation of the Company. The Company shall give the Escrow Agent written notification of the liquidation and dissolution of the Company in the event that the Company fails to consummate a Business Combination within the time period specified in the Prospectus.

[Signature Page Follows]

WITNESS the execution of this Agreement as of the date first above written.

[Signature Page to Stock Escrow Agreement]

EXHIBIT B

Escrow Shares

EXHIBIT C

Insider Letter

 June 29, 2021

Mountain Crest Acquisition Corp. IV

311 West 43rd Street, 12th Floor

New York, NY 10036

Network 1 Financial Securities, Inc.

2 Bridge Ave #241

Red Bank, NJ 07701

Gentlemen:

This letter is being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”) entered into by and between Mountain Crest Acquisition Corp. IV, a Delaware corporation (the “Company”), and Network 1 Financial Securities, Inc., as Representative (the “Representative”) of the several underwriters named on Schedule A thereto (the “Underwriters”), relating to an underwritten initial public offering (the “IPO”) of the Company’s units (the “Units”), each comprised of one share of common stock of the Company, $0.0001 par value (the “Common Stock”) and one right to receive one-tenth (1/10) of one share of Common Stock (the “Rights”). Certain capitalized terms used herein are defined in paragraph 16 hereof.

In order to induce the Company and the Underwriters to enter into the Underwriting Agreement and to proceed with the IPO, and in recognition of the benefit that such IPO will confer upon the undersigned as a shareholder of the Company, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the undersigned hereby agrees with the Company as follows:

1. If the Company solicits approval of its shareholders of a Business Combination, the undersigned will vote all shares of Common Stock beneficially owned by him, her or it, whether acquired before, in or after the IPO, in favor of such Business Combination.

2. (a) Unless the Company’s shareholders are previously given the option to redeem their shares in connection with amending applicable documents to extend the time that the Company has to complete a Business Combination and the Company fails to consummate a Business Combination within 12 months from the closing of the Company’s IPO (or, in the event that the Company extended the period of time to consummate a business combination up to 18 months from the closing of the Company’s IPO, as specified in the Company’s amended and restated certificate of incorporation), the undersigned shall take all reasonable steps to (i) cause the Trust Fund to be liquidated and distributed to the holders of the IPO Shares and (ii) cause the Company to liquidate as soon as reasonably practicable.

(b) The undersigned hereby waives any and all right, title, interest or claim of any kind in or to any distribution of the Trust Fund and any remaining net assets of the Company as a result of such liquidation with respect to his, her or its Insider Shares including any shares underlying the Private Units (“Claim”) and hereby waives any Claim the undersigned may have in the future as a result of, or arising out of, any contracts or agreements with the Company and will not seek recourse against the Trust Fund for any reason whatsoever. The undersigned acknowledges and agrees that there will be no distribution from the Trust Fund with respect to any Rights underlying the Private Units, all of which will terminate on the Company’s liquidation.

3. In the event of the liquidation of the Trust Fund, Mountain Crest Holdings IV LLC agrees to indemnify and hold harmless the Company against any and all loss, liability, claims, damage and expense whatsoever (including, but not limited to, any and all legal or other expenses reasonably incurred in investigating, preparing or defending against any litigation, whether pending or threatened, or any claim whatsoever) which the Company may become subject as a result of any claim by any target business or vendor or other person who is owed money by the Company for services rendered or products sold or contracted for, but only to the extent necessary to ensure that such loss, liability, claim, damage or expense does not reduce the amount of funds in the Trust Fund; provided that such indemnity shall not apply if such target business, vendor or other person has executed an agreement waiving any claims against the Trust Fund.

4. In the event that the Company does not consummate a Business Combination and must liquidate and its remaining net assets are insufficient to complete such liquidation, Mountain Crest Holdings IV LLC agrees to advance such funds necessary to complete such liquidation and agrees not to seek recourse for such expenses.

5. The undersigned will escrow all of his, her or its Insider Shares pursuant to the terms of a Stock Escrow Agreement, which the Company will enter into with the undersigned and an escrow agent acceptable to the Company. After the underwriter exercises its over-allotment option in full, the remaining portion of the underwriter’s over-allotment option is canceled, or the underwriter’s over-allotment option terminates, the undersigned agrees to cancel a portion of the undersigned’s Insider Shares such that the total number of Insider Shares equals (i) .25 multiplied by (ii) the number of Units sold in the IPO.

6. The undersigned agrees that until the Company consummates a Business Combination, the undersigned’s Private Units will be subject to the transfer restrictions described in the Subscription Agreement relating to the undersigned’s Private Units.

7. In order to minimize potential conflicts of interest which may arise from multiple affiliations, the undersigned agrees to present to the Company for its consideration, prior to presentation to any other person or entity, any suitable opportunity to acquire a target business, until the earlier of the consummation by the Company of a Business Combination or the liquidation of the Company, subject to any pre-existing fiduciary and contractual obligations the undersigned might have.

8. The undersigned acknowledges and agrees that prior to entering into a Business Combination with a target business that is affiliated with any Insiders of the Company or their affiliates, including any company that is a portfolio company of, or otherwise affiliated with, or has received financial investment from, an entity with which any Insider or their affiliates is affiliated, such transaction must be approved by a majority of the Company’s disinterested independent directors and the Company must obtain an opinion from an independent investment banking firm that such Business Combination is fair to the Company’s unaffiliated shareholders from a financial point of view.

9. Neither the undersigned, any member of the family of the undersigned, nor any affiliate of the undersigned will be entitled to receive and will not accept any compensation or other cash payment prior to, or for services rendered in connection with, the consummation of the Business Combination; provided that the Company shall be allowed to repay working capital loans made by the undersigned to the Company in cash upon consummation of the Business Combination. Notwithstanding the foregoing, the undersigned and any affiliate of the undersigned shall be entitled to reimbursement from the Company for their out-of-pocket expenses incurred in connection with identifying, investigating and consummating a Business Combination.

10. Neither the undersigned, any member of the family of the undersigned, nor any affiliate of the undersigned will be entitled to receive or accept a finder’s fee or any other compensation in the event the undersigned, any member of the family of the undersigned or any affiliate of the undersigned originates a Business Combination.

11. Each of the undersigned officers and directors agrees to be a director or officer, as applicable of the Company until the earlier of the consummation by the Company of a Business Combination or the liquidation of the Company. The undersigned’s biographical information previously furnished to the Company and the Representative is true and accurate in all material respects, does not omit any material information with respect to the undersigned’s biography and contains all of the information required to be disclosed pursuant to Item 401 of Regulation S-K, promulgated under the Securities Act of 1933.]³ The FINRA Questionnaire of each of the undersigned officers and directors previously furnished to the Company and the Representative is true and accurate in all material respects. Each of the undersigned represents and warrants that:

12. The undersigned has full right and power, without violating any agreement by which he, she or it is bound, to enter into this letter agreement and to serve as a Director and/or officer of the Company, as applicable.

13. The undersigned hereby waives his, her or its right to exercise redemption rights with respect to any shares of Common Stock owned or to be owned by the undersigned, directly or indirectly, whether purchased by the undersigned prior to the IPO, in the IPO or in the aftermarket, and agrees that he, she or it will not seek redemption with respect to or otherwise sell, such shares in connection with any vote to approve a Business Combination with respect thereto, a vote to amend the provisions of the Company’s Amended and Restated Certificate of Incorporation, or a tender offer by the Company prior to a Business Combination.

14. The undersigned hereby agrees to not propose, or vote in favor of, 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 offers holders of IPO Shares the right to receive their pro rata portion of the funds then held in the Trust Fund.

15. In connection with Section 5-1401 of the General Obligations Law of the State of New York, this letter agreement shall be governed by, and construed in accordance with, the laws of the State of New York without regard to principles of conflicts of law that would result in the application of the substantive law of another jurisdiction. The parties hereto agree that any action, proceeding or claim arising out of or relating in any way to this letter agreement shall be resolved through final and binding arbitration in accordance with the International Arbitration Rules of the American Arbitration Association (“AAA”). The arbitration shall be brought before the AAA International Center for Dispute Resolution’s offices in New York City, New York, will be conducted in English and will be decided by a panel of three arbitrators selected from the AAA Commercial Disputes Panel and that the arbitrator panel’s decision shall be final and enforceable by any court having jurisdiction over the party from whom enforcement is sought. The cost of such arbitrators and arbitration services, together with the prevailing party’s legal fees and expenses, shall be borne by the non-prevailing party or as otherwise directed by the arbitrators.

16. As used herein, (i) a “Business Combination” shall mean a merger, share exchange, asset acquisition, contractual arrangement, share purchase, recapitalization, reorganization or other similar business combination with one or more businesses or entities; (ii) “Insiders” shall mean all officers, directors and shareholders of the Company immediately prior to the IPO; (iii) “Insider Shares” shall mean all of the shares of Common Stock of the Company acquired by an Insider prior to the IPO and any shares of Common Stock underlying the Private Units; (iv) “IPO Shares” shall mean the shares of Common Stock issued in the Company’s IPO; (v) “Private Units” shall mean (x) the Units purchased in the private placement taking place simultaneously with the consummation of the Company’s IPO and (y) the additional Units that may be purchased in connection with the exercise of the over-allotment option by the underwriters in the IPO as described in the Registration Statement; (vi) “Registration Statement” means the registration statement on Form S-1 filed by the Company with respect to the IPO; and (vii) “Trust Fund” shall mean the trust fund into which a portion of the net proceeds of the Company’s IPO will be deposited.

17. Any notice, consent or request to be given in connection with any of the terms or provisions of this letter agreement shall be in writing and shall be sent by express mail or similar private courier service, by certified mail (return receipt requested), by hand delivery or facsimile transmission.

If to the Representative:

Network 1 Financial Securities, Inc.

2 Bridge Ave #241

Red Bank, NJ 07701

Attn: Karen (Huiyun) Mu

Facsimile: (732) 758-6671

with a copy (which copy shall not constitute notice) to:

Ortoli Rosenstadt LLP

366 Madison Ave 3rd floor

New York, NY 10017

Attn: Yarona L. Yieh

Fax No.: (212) 588-0022

If to the Company:

Mountain Crest Acquisition Corp. IV

311 West 43rd Street, 12 Floor

New York, NY 10036

Attn: Suying Liu, Chief Executive Officer

with a copy (which copy shall not constitute notice) to:

Loeb & Loeb LLP 

345 Park Avenue

New York, NY 10154

Attn: Giovanni Caruso, Esq.

Facsimile: (212) 407-4990

18. No party hereto may assign either this letter agreement or any of its rights, interests, or obligations hereunder without the prior written consent of the other party. Any purported assignment in violation of this paragraph shall be void and ineffectual and shall not operate to transfer or assign any interest or title to the purported assignee. This letter agreement shall be binding on the parties hereto and any successors and assigns thereof.

19. The undersigned acknowledges and understands that the Underwriters and the Company will rely upon the agreements, representations and warranties set forth herein in proceeding with the IPO.

[Signature Page Follows]

[SIGNATURE PAGE TO LETTER AGREEMENT]

Exhibit 10.4

REGISTRATION RIGHTS AGREEMENT

THIS REGISTRATION RIGHTS AGREEMENT (this “Agreement” ) is entered into as of the 29th day of June, 2021, by and among Mountain Crest Acquisition Corp. IV, a Delaware corporation (the “Company” ) and the undersigned parties listed under Investors on the signature page hereto (each, an “Investor” and collectively, the “Investors” ).

WHEREAS, the Investors and the Company desire to enter into this Agreement to provide the Investors with certain rights relating to the registration of the securities held by them as of the date hereof;

NOW, THEREFORE, in consideration of the mutual covenants and agreements set forth herein, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows:

1. DEFINITIONS. The following capitalized terms used herein have the following meanings:

“Agreement” means this Agreement, as amended, restated, supplemented, or otherwise modified from time to time.

“Business Combination” means the acquisition of direct or indirect ownership through a merger, share exchange, asset acquisition, share purchase, recapitalization, reorganization or other similar type of transaction, of one or more businesses or entities.

“Commission” means the Securities and Exchange Commission, or any other Federal agency then administering the Securities Act or the Exchange Act.

“Common Stock” means the common stock, par value $0.0001 per share, of the Company.

“Company” is defined in the preamble to this Agreement.

“Demand Registration” is defined in Section 2.1.1.

“Demanding Holder” is defined in Section 2.1.1.

“Exchange Act” means the Securities Exchange Act of 1934, as amended, and the rules and regulations of the Commission promulgated thereunder, all as the same shall be in effect at the time.

“Form S-3” is defined in Section 2.3.

“Indemnified Party” is defined in Section 4.3.

“Indemnifying Party” is defined in Section 4.3.

“Initial Shares” means all of the outstanding shares of Common Stock issued prior to the consummation of the Company’s initial public offering.

“Investor” is defined in the preamble to this Agreement.

“Investor Indemnified Party” is defined in Section 4.1.

“Maximum Number of Shares” is defined in Section 2.1.4.

“Notices” is defined in Section 6.3.

“Piggy-Back Registration” is defined in Section 2.2.1.

“Over-Allotment Units” means the additional number of Private Units the various Investors will be required to purchase in the event that the underwriters in the Company’s initial public offering exercise their over-allotment option, as described in the prospectus relating to the Company’s initial public offering.

“Private Units” means the up to 2,000,000 units various Investors are privately purchasing simultaneously with the consummation of the Company’s initial public offering.

“Register,” “Registered” and “Registration” mean a registration effected by preparing and filing a registration statement or similar document in compliance with the requirements of the Securities Act, and the applicable rules and regulations promulgated thereunder, and such registration statement becoming effective.

“Registrable Securities” means (i) the Initial Shares, (ii) the Private Units (and underlying shares of Common Stock), (iii) the Over-Allotment Units (and underlying shares of Common Stock), if any, and (iv) any securities issuable upon conversion of loans from Investors to the Company, if any (the “Loan Securities” ). Registrable Securities include any warrants, share capital or other securities of the Company issued as a dividend or other distribution with respect to or in exchange for or in replacement of such Initial Shares, Private Units (and underlying shares of Common Stock), Over-Allotment Units (and underlying shares of Common Stock) and Loan Securities. As to any particular Registrable Securities, such securities shall cease to be Registrable Securities when: (a) a Registration Statement with respect to the sale of such securities shall have become effective under the Securities Act and such securities shall have been sold, transferred, disposed of or exchanged in accordance with such Registration Statement; (b) such securities shall have been otherwise transferred, new certificates for them not bearing a legend restricting further transfer shall have been delivered by the Company and subsequent public distribution of them shall not require registration under the Securities Act; (c) such securities shall have ceased to be outstanding, or (d) the Registrable Securities are freely saleable under Rule 144 without volume limitations.

“Registration Statement” means a registration statement filed by the Company with the Commission in compliance with the Securities Act and the rules and regulations promulgated thereunder for a public offering and sale of equity securities, or securities or other obligations exercisable or exchangeable for, or convertible into, equity securities (other than a registration statement on Form S-4 or Form S-8, or their successors, or any registration statement covering only securities proposed to be issued in exchange for securities or assets of another entity).

“Release Date” means the date on which the Initial Shares are disbursed from escrow pursuant to Section 3 of that certain Stock Escrow Agreement dated as of June 29, 2021 by and among the Investors and Continental Stock Transfer & Trust Company.

“Securities Act” means the Securities Act of 1933, as amended, and the rules and regulations of the Commission promulgated thereunder, all as the same shall be in effect at the time.

“Underwriter” means, solely for the purposes of this Agreement, a securities dealer who purchases any Registrable Securities as principal in an underwritten offering and not as part of such dealer’s market-making activities.

“Units” means the units of the Company, each comprised of one share of Common Stock and one right to acquire one-tenth (1/10) of one share of Common Stock

2. REGISTRATION RIGHTS.

2.1 Demand Registration.

2.1.1 Request for Registration. At any time and from time to time on or after (i) the date that the Company consummates a Business Combination with respect to the Private Units (or underlying shares of Common Stock), Over-Allotment Units (or underlying shares of Common Stock) and Loan Securities or (ii) three months prior to the Release Date with respect to all other Registrable Securities, the holders of a majority-in-interest of the Registrable Securities, as the case may be, held by the Investors, officers or directors of the Company or their affiliates, or the transferees of the Investors, may make a written demand, on no more than two occasions, for registration under the Securities Act of all or part of their Registrable Securities, as the case may be (a “Demand Registration” ). Any demand for a Demand Registration shall specify the number of shares of Registrable Securities proposed to be sold and the intended method(s) of distribution thereof. The Company will notify all holders of Registrable Securities of the demand, and each holder of Registrable Securities who wishes to include all or a portion of such holder’s Registrable Securities in the Demand Registration (each such holder including shares of Registrable Securities in such registration, a “Demanding Holder” ) shall so notify the Company within fifteen (15) days after the receipt by the holder of the notice from the Company. Upon any such request, the Demanding Holders shall be entitled to have their Registrable Securities included in the Demand Registration, subject to Section 2.1.4 and the provisos set forth in Section 3.1.1. The Company shall not be obligated to effect more than an aggregate of one (1) Demand Registration under this Section 2.1.1 in respect of all Registrable Securities.

2.1.2 Effective Registration. A registration will not count as a Demand Registration until the Registration Statement filed with the Commission with respect to such Demand Registration has been declared effective and the Company has complied with all of its obligations under this Agreement with respect thereto; provided, however, that if, after such Registration Statement has been declared effective, the offering of Registrable Securities pursuant to a Demand Registration is interfered with by any stop order or injunction of the Commission or any other governmental agency or court, the Registration Statement with respect to such Demand Registration will be deemed not to have been declared effective, unless and until, (i) such stop order or injunction is removed, rescinded or otherwise terminated, and (ii) a majority-in-interest of the Demanding Holders thereafter elect to continue the offering; provided, further, that the Company shall not be obligated to file a second Registration Statement until a Registration Statement that has been filed is counted as a Demand Registration or is terminated.

2.1.3 Underwritten Offering. If a majority-in-interest of the Demanding Holders so elect and such holders so advise the Company as part of their written demand for a Demand Registration, the offering of such Registrable Securities pursuant to such Demand Registration shall be in the form of an underwritten offering. In such event, the right of any holder to include its Registrable Securities in such registration shall be conditioned upon such holder’s participation in such underwriting and the inclusion of such holder’s Registrable Securities in the underwriting to the extent provided herein. All Demanding Holders proposing to distribute their Registrable Securities through such underwriting shall enter into an underwriting agreement in customary form with the Underwriter or Underwriters selected for such underwriting by a majority-in-interest of the holders initiating the Demand Registration.

2.1.4 Reduction of Offering. If the managing Underwriter or Underwriters for a Demand Registration that is to be an underwritten offering advises the Company and the Demanding Holders in writing that the dollar amount or number of shares of Registrable Securities which the Demanding Holders desire to sell, taken together with all other shares of Common Stock or other securities which the Company desires to sell and the shares of Common Stock, if any, as to which registration has been requested pursuant to written contractual piggy-back registration rights held by other shareholders of the Company who desire to sell, exceeds the maximum dollar amount or maximum number of shares that can be sold in such offering without adversely affecting the proposed offering price, the timing, the distribution method, or the probability of success of such offering (such maximum dollar amount or maximum number of shares, as applicable, the “Maximum Number of Shares” ), then the Company shall include in such registration: (i) first, the Registrable Securities as to which Demand Registration has been requested by the Demanding Holders (pro rata in accordance with the number of shares that each such Person has requested be included in such registration, regardless of the number of shares held by each such Person (such proportion is referred to herein as “Pro Rata” )) that can be sold without exceeding the Maximum Number of Shares; (ii) second, to the extent that the Maximum Number of Shares has not been reached under the foregoing clause (i), the shares of Common Stock or other securities that the Company desires to sell that can be sold without exceeding the Maximum Number of Shares; and (iii) third, to the extent that the Maximum Number of Shares has not been reached under the foregoing clauses (i) and (ii), the shares of Common Stock or other securities for the account of other persons that the Company is obligated to register pursuant to written contractual arrangements with such persons and that can be sold without exceeding the Maximum Number of Shares.

2.1.5 Withdrawal. If a majority-in-interest of the Demanding Holders disapprove of the terms of any underwriting or are not entitled to include all of their Registrable Securities in any offering, such majority-in-interest of the Demanding Holders may elect to withdraw from such offering by giving written notice to the Company and the Underwriter or Underwriters of their request to withdraw prior to the effectiveness of the Registration Statement filed with the Commission with respect to such Demand Registration. If the majority-in-interest of the Demanding Holders withdraws from a proposed offering relating to a Demand Registration, then such registration shall not count as a Demand Registration provided for in Section 2.1.

2.2 Piggy-Back Registration.

2.2.1 Piggy-Back Rights. If at any time on or after the date the Company consummates a Business Combination the Company proposes to file a Registration Statement under the Securities Act with respect to an offering of equity securities, or securities or other obligations exercisable or exchangeable for, or convertible into, equity securities, by the Company for its own account or for shareholders of the Company for their account (or by the Company and by shareholders of the Company including, without limitation, pursuant to Section 2.1), other than a Registration Statement (i) filed in connection with any employee stock option or other benefit plan, (ii) for an exchange offer or offering of securities solely to the Company’s existing shareholders, (iii) for an offering of debt that is convertible into equity securities of the Company or (iv) for a dividend reinvestment plan, then the Company shall (x) give written notice of such proposed filing to the holders of Registrable Securities as soon as practicable but in no event less than ten (10) days before the anticipated filing date, which notice shall describe the amount and type of securities to be included in such offering, the intended method(s) of distribution, and the name of the proposed managing Underwriter or Underwriters, if any, of the offering, and (y) offer to the holders of Registrable Securities in such notice the opportunity to register the sale of such number of shares of Registrable Securities as such holders may request in writing within five (5) days following receipt of such notice (a “Piggy-Back Registration” ). The Company shall cause such Registrable Securities to be included in such registration and shall use its best efforts to cause the managing Underwriter or Underwriters of a proposed underwritten offering to permit the Registrable Securities requested to be included in a Piggy-Back Registration on the same terms and conditions as any similar securities of the Company and to permit the sale or other disposition of such Registrable Securities in accordance with the intended method(s) of distribution thereof. All holders of Registrable Securities proposing to distribute their securities through a Piggy-Back Registration that involves an Underwriter or Underwriters shall enter into an underwriting agreement in customary form with the Underwriter or Underwriters selected for such Piggy-Back Registration. Notwithstanding the provisions set forth in the immediately preceding sentences, the right to a Piggy-Back Registration set forth under this Section 2.2.1 with respect to the Registrable Securities shall terminate on the seventh anniversary of the Effective Date.

2.2.2 Reduction of Offering. If the managing Underwriter or Underwriters for a Piggy-Back Registration that is to be an underwritten offering advises the Company and the holders of Registrable Securities in writing that the dollar amount or number of shares of Common Stock which the Company desires to sell, taken together with the shares of Common Stock, if any, as to which registration has been demanded pursuant to written contractual arrangements with persons other than the holders of Registrable Securities hereunder, the Registrable Securities as to which registration has been requested under this Section 2.2, and the shares of Common Stock, if any, as to which registration has been requested pursuant to the written contractual piggy-back registration rights of other shareholders of the Company, exceeds the Maximum Number of Shares, then the Company shall include in any such registration:

a) If the registration is undertaken for the Company’s account: (A) first, the shares of Common Stock or other securities that the Company desires to sell that can be sold without exceeding the Maximum Number of Shares; (B) second, to the extent that the Maximum Number of Shares has not been reached under the foregoing clause (A), the shares of Common Stock or other securities, if any, comprised of Registrable Securities, as to which registration has been requested pursuant to the applicable written contractual piggy-back registration rights of such security holders, Pro Rata, that can be sold without exceeding the Maximum Number of Shares; and (C) third, to the extent that the Maximum Number of Shares has not been reached under the foregoing clauses (A) and (B), the shares of Common Stock or other securities for the account of other persons that the Company is obligated to register pursuant to written contractual piggy-back registration rights with such persons and that can be sold without exceeding the Maximum Number of Shares;

b) If the registration is a “demand” registration undertaken at the demand of persons other than either the holders of Registrable Securities, (A) first, the shares of Common Stock or other securities for the account of the demanding persons that can be sold without exceeding the Maximum Number of Shares; (B) second, to the extent that the Maximum Number of Shares has not been reached under the foregoing clause (A), the shares of Common Stock or other securities that the Company desires to sell that can be sold without exceeding the Maximum Number of Shares; (C) third, to the extent that the Maximum Number of Shares has not been reached under the foregoing clauses (A) and (B), collectively the shares of Common Stock or other securities comprised of Registrable Securities, Pro Rata, as to which registration has been requested pursuant to the terms hereof, that can be sold without exceeding the Maximum Number of Shares; and (D) fourth, to the extent that the Maximum Number of Shares has not been reached under the foregoing clauses (A), (B) and (C), the shares of Common Stock or other securities for the account of other persons that the Company is obligated to register pursuant to written contractual arrangements with such persons, that can be sold without exceeding the Maximum Number of Shares.

2.2.3 Withdrawal. Any holder of Registrable Securities may elect to withdraw such holder’s request for inclusion of Registrable Securities in any Piggy-Back Registration by giving written notice to the Company of such request to withdraw prior to the effectiveness of the Registration Statement. The Company (whether on its own determination or as the result of a withdrawal by persons making a demand pursuant to written contractual obligations) may withdraw a Registration Statement at any time prior to the effectiveness of such Registration Statement. Notwithstanding any such withdrawal, the Company shall pay all expenses incurred by the holders of Registrable Securities in connection with such Piggy-Back Registration as provided in Section 3.3.

2.2.4 Registrations on Form S-3. The holders of Registrable Securities may at any time and from time to time, request in writing that the Company register the resale of any or all of such Registrable Securities on Form S-3 or any similar short-form registration which may be available at such time (“Form S-3” ); provided, however, that the Company shall not be obligated to effect such request through an underwritten offering. Upon receipt of such written request, the Company will promptly give written notice of the proposed registration to all other holders of Registrable Securities, and, as soon as practicable thereafter, effect the registration of all or such portion of such holder’s or holders’ Registrable Securities as are specified in such request, together with all or such portion of the Registrable Securities or other securities of the Company, if any, of any other holder or holders joining in such request as are specified in a written request given within fifteen (15) days after receipt of such written notice from the Company; provided, however, that the Company shall not be obligated to effect any such registration pursuant to this Section 2.3: (i) if Form S-3 is not available for such offering; or (ii) if the holders of the Registrable Securities, together with the holders of any other securities of the Company entitled to inclusion in such registration, propose to sell Registrable Securities and such other securities (if any) at any aggregate price to the public of less than $500,000. Registrations effected pursuant to this Section 2.3 shall not be counted as Demand Registrations effected pursuant to Section 2.1.

3. REGISTRATION PROCEDURES.

3.1 Filings; Information. Whenever the Company is required to effect the registration of any Registrable Securities pursuant to Section 2, the Company shall use its best efforts to effect the registration and sale of such Registrable Securities in accordance with the intended method(s) of distribution thereof as expeditiously as practicable, and in connection with any such request:

3.1.1 Filing Registration Statement. The Company shall use its best efforts to, as expeditiously as possible after receipt of a request for a Demand Registration pursuant to Section 2.1, prepare and file with the Commission a Registration Statement on any form for which the Company then qualifies or which counsel for the Company shall deem appropriate and which form shall be available for the sale of all Registrable Securities to be registered thereunder in accordance with the intended method(s) of distribution thereof, and shall use its best efforts to cause such Registration Statement to become effective and use its best efforts to keep it effective for the period required by Section 3.1.3; provided, however, that the Company shall have the right to defer any Demand Registration for up to thirty (30) days, and any Piggy-Back Registration for such period as may be applicable to deferment of any demand registration to which such Piggy-Back Registration relates, in each case if the Company shall furnish to the holders a certificate signed by Chief Executive Officer or Chairman of the Company stating that, in the good faith judgment of the Board of Directors of the Company, it would be materially detrimental to the Company and its shareholders for such Registration Statement to be effected at such time; provided further, however, that the Company shall not have the right to exercise the right set forth in this provision more than once in any 365-day period in respect of a Demand Registration hereunder.

3.1.2 Copies. The Company shall, prior to filing a Registration Statement or prospectus, or any amendment or supplement thereto, furnish without charge to the holders of Registrable Securities included in such registration, and such holders’ legal counsel, copies of such Registration Statement as proposed to be filed, each amendment and supplement to such Registration Statement (in each case including all exhibits thereto and documents incorporated by reference therein), the prospectus included in such Registration Statement (including each preliminary prospectus), and such other documents as the holders of Registrable Securities included in such registration or legal counsel for any such holders may request in order to facilitate the disposition of the Registrable Securities owned by such holders.

3.1.3 Amendments and Supplements. The Company shall prepare and file with the Commission such amendments, including post-effective amendments, and supplements to such Registration Statement and the prospectus used in connection therewith as may be necessary to keep such Registration Statement effective and in compliance with the provisions of the Securities Act until all Registrable Securities and other securities covered by such Registration Statement have been disposed of in accordance with the intended method(s) of distribution set forth in such Registration Statement or such securities have been withdrawn.

3.1.4 Notification. After the filing of a Registration Statement, the Company shall promptly, and in no event more than two (2) business days after such filing, notify the holders of Registrable Securities included in such Registration Statement of such filing, and shall further notify such holders promptly and confirm such advice in writing in all events within two (2) business days of the occurrence of any of the following: (i) when such Registration Statement becomes effective; (ii) when any post-effective amendment to such Registration Statement becomes effective; (iii) the issuance or threatened issuance by the Commission of any stop order (and the Company shall take all actions required to prevent the entry of such stop order or to remove it if entered); and (iv) any request by the Commission for any amendment or supplement to such Registration Statement or any prospectus relating thereto or for additional information or of the occurrence of an event requiring the preparation of a supplement or amendment to such prospectus so that, as thereafter delivered to the purchasers of the securities covered by such Registration Statement, such prospectus will not contain an untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary to make the statements therein not misleading, and promptly make available to the holders of Registrable Securities included in such Registration Statement any such supplement or amendment; except that before filing with the Commission a Registration Statement or prospectus or any amendment or supplement thereto, including documents incorporated by reference, the Company shall furnish to the holders of Registrable Securities included in such Registration Statement and to the legal counsel for any such holders, copies of all such documents proposed to be filed sufficiently in advance of filing to provide such holders and legal counsel with a reasonable opportunity to review such documents and comment thereon, and the Company shall not file any Registration Statement or prospectus or amendment or supplement thereto, including documents incorporated by reference, to which such holders or their legal counsel shall object.

3.1.5 State Securities Laws Compliance. The Company shall use its best efforts to (i) register or qualify the Registrable Securities covered by the Registration Statement under such securities or “blue sky” laws of such jurisdictions in the United States as the holders of Registrable Securities included in such Registration Statement (in light of their intended plan of distribution) may request and (ii) take such action necessary to cause such Registrable Securities covered by the Registration Statement to be registered with or approved by such other governmental authorities as may be necessary by virtue of the business and operations of the Company and do any and all other acts and things that may be necessary or advisable to enable the holders of Registrable Securities included in such Registration Statement to consummate the disposition of such Registrable Securities in such jurisdictions; provided, however, that the Company shall not be required to qualify generally to do business in any jurisdiction where it would not otherwise be required to qualify but for this paragraph or subject itself to taxation in any such jurisdiction.

3.1.6 Agreements for Disposition. The Company shall enter into customary agreements (including, if applicable, an underwriting agreement in customary form) and take such other actions as are reasonably required in order to expedite or facilitate the disposition of such Registrable Securities. The representations, warranties and covenants of the Company in any underwriting agreement which are made to or for the benefit of any Underwriters, to the extent applicable, shall also be made to and for the benefit of the holders of Registrable Securities included in such registration statement. No holder of Registrable Securities included in such registration statement shall be required to make any representations or warranties in the underwriting agreement except, if applicable, with respect to such holder’s organization, good standing, authority, title to Registrable Securities, lack of conflict of such sale with such holder’s material agreements and organizational documents, and with respect to written information relating to such holder that such holder has furnished in writing expressly for inclusion in such Registration Statement.

3.1.7 Cooperation. The principal executive officer of the Company, the principal financial officer of the Company, the principal accounting officer of the Company and all other officers and members of the management of the Company shall cooperate fully in any offering of Registrable Securities hereunder, which cooperation shall include, without limitation, the preparation of the Registration Statement with respect to such offering and all other offering materials and related documents, and participation in meetings with Underwriters, attorneys, accountants and potential investors.

3.1.8 Records. The Company shall make available for inspection by the holders of Registrable Securities included in such Registration Statement, any Underwriter participating in any disposition pursuant to such registration statement and any attorney, accountant or other professional retained by any holder of Registrable Securities included in such Registration Statement or any Underwriter, all financial and other records, pertinent corporate documents and properties of the Company, as shall be necessary to enable them to exercise their due diligence responsibility, and cause the Company’s officers, directors and employees to supply all information requested by any of them in connection with such Registration Statement.

3.1.9 Opinions and Comfort Letters. Upon request, the Company shall furnish to each holder of Registrable Securities included in any Registration Statement a signed counterpart, addressed to such holder, of (i) any opinion of counsel to the Company delivered to any Underwriter and (ii) any comfort letter from the Company’s independent public accountants delivered to any Underwriter. In the event no legal opinion is delivered to any Underwriter, the Company shall furnish to each holder of Registrable Securities included in such Registration Statement, at any time that such holder elects to use a prospectus, an opinion of counsel to the Company to the effect that the Registration Statement containing such prospectus has been declared effective and that no stop order is in effect.

3.1.10 Earnings Statement. The Company shall comply with all applicable rules and regulations of the Commission and the Securities Act, and make available to its shareholders, as soon as practicable, an earnings statement covering a period of twelve (12) months, which earnings statement shall satisfy the provisions of Section 11(a) of the Securities Act and Rule 158 thereunder.

3.1.11 Listing. The Company shall use its best efforts to cause all Registrable Securities included in any registration to be listed on such exchanges or otherwise designated for trading in the same manner as similar securities issued by the Company are then listed or designated or, if no such similar securities are then listed or designated, in a manner satisfactory to the holders of a majority of the Registrable Securities included in such registration.

3.1.12 Road Show. If the registration involves the registration of Registrable Securities involving gross proceeds in excess of $500,000, the Company shall use its reasonable efforts to make available senior executives of the Company to participate in customary “road show” presentations that may be reasonably requested by the Underwriter in any underwritten offering.

3.2 Obligation to Suspend Distribution. Upon receipt of any notice from the Company of the happening of any event of the kind described in Section 3.1.4(iv), or, in the case of a resale registration on Form S-3 pursuant to Section 2.3 hereof, upon any suspension by the Company, pursuant to a written insider trading compliance program adopted by the Company’s Board of Directors, of the ability of all “insiders” covered by such program to transact in the Company’s securities because of the existence of material non-public information, each holder of Registrable Securities included in any registration shall immediately discontinue disposition of such Registrable Securities pursuant to the Registration Statement covering such Registrable Securities until such holder receives the supplemented or amended prospectus contemplated by Section 3.1.4(iv) or the restriction on the ability of “insiders” to transact in the Company’s securities is removed, as applicable, and, if so directed by the Company, each such holder will deliver to the Company all copies, other than permanent file copies then in such holder’s possession, of the most recent prospectus covering such Registrable Securities at the time of receipt of such notice.

3.3 Registration Expenses. The Company shall bear all costs and expenses incurred in connection with any Demand Registration pursuant to Section 2.1, any Piggy-Back Registration pursuant to Section 2.2, and any registration on Form S-3 effected pursuant to Section 2.3, and all expenses incurred in performing or complying with its other obligations under this Agreement, whether or not the Registration Statement becomes effective, including, without limitation: (i) all registration and filing fees; (ii) fees and expenses of compliance with securities or “blue sky” laws (including fees and disbursements of counsel in connection with blue sky qualifications of the Registrable Securities); (iii) printing expenses; (iv) the Company’s internal expenses (including, without limitation, all salaries and expenses of its officers and employees); (v) the fees and expenses incurred in connection with the listing of the Registrable Securities as required by Section 3.1.11; (vi) Financial Industry Regulatory Authority fees; (vii) fees and disbursements of counsel for the Company and fees and expenses for independent certified public accountants retained by the Company (including the expenses or costs associated with the delivery of any opinions or comfort letters requested pursuant to Section 3.1.9); (viii) the reasonable fees and expenses of any special experts retained by the Company in connection with such registration and (ix) the reasonable fees and expenses of one legal counsel selected by the holders of a majority-in-interest of the Registrable Securities included in such registration. The Company shall have no obligation to pay any underwriting discounts or selling commissions attributable to the Registrable Securities being sold by the holders thereof, which underwriting discounts or selling commissions shall be borne by such holders. Additionally, in an underwritten offering, all selling shareholders and the Company shall bear the expenses of the Underwriter pro rata in proportion to the respective amount of shares each is selling in such offering.

3.4 Information. The holders of Registrable Securities shall provide such information as may reasonably be requested by the Company, or the managing Underwriter, if any, in connection with the preparation of any Registration Statement, including amendments and supplements thereto, in order to effect the registration of any Registrable Securities under the Securities Act pursuant to Section 2 and in connection with the Company’s obligation to comply with Federal and applicable state securities laws.

4. INDEMNIFICATION AND CONTRIBUTION.

4.1 Indemnification by the Company. The Company agrees to indemnify and hold harmless each Investor and each other holder of Registrable Securities, and each of their respective officers, employees, affiliates, directors, partners, members, attorneys and agents, and each person, if any, who controls an Investor and each other holder of Registrable Securities (within the meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act) (each, an “Investor Indemnified Party” ), from and against any expenses, losses, judgments, claims, damages or liabilities, whether joint or several, arising out of or based upon any untrue statement (or allegedly untrue statement) of a material fact contained in any Registration Statement under which the sale of such Registrable Securities was registered under the Securities Act, any preliminary prospectus, final prospectus or summary prospectus contained in the Registration Statement, or any amendment or supplement to such Registration Statement, or arising out of or based upon any omission (or alleged omission) to state a material fact required to be stated therein or necessary to make the statements therein not misleading, or any violation by the Company of the Securities Act or any rule or regulation promulgated thereunder applicable to the Company and relating to action or inaction required of the Company in connection with any such registration; and the Company shall promptly reimburse the Investor Indemnified Party for any legal and any other expenses reasonably incurred by such Investor Indemnified Party in connection with investigating and defending any such expense, loss, judgment, claim, damage, liability or action; provided, however, that the Company will not be liable in any such case to the extent that any such expense, loss, claim, damage or liability arises out of or is based upon any untrue statement or allegedly untrue statement or omission or alleged omission made in such Registration Statement, preliminary prospectus, final prospectus, or summary prospectus, or any such amendment or supplement, in reliance upon and in conformity with information furnished to the Company, in writing, by such selling holder expressly for use therein. The Company also shall indemnify any Underwriter of the Registrable Securities, their officers, affiliates, directors, partners, members and agents and each person who controls such Underwriter on substantially the same basis as that of the indemnification provided above in this Section 4.1.

4.2 Indemnification by Holders of Registrable Securities. Each selling holder of Registrable Securities will, in the event that any registration is being effected under the Securities Act pursuant to this Agreement of any Registrable Securities held by such selling holder, indemnify and hold harmless the Company, each of its directors and officers and each Underwriter (if any), and each other selling holder and each other person, if any, who controls another selling holder or such Underwriter within the meaning of the Securities Act, against any losses, claims, judgments, damages or liabilities, whether joint or several, insofar as such losses, claims, judgments, damages or liabilities (or actions in respect thereof) arise out of or are based upon any untrue statement or allegedly untrue statement of a material fact contained in any Registration Statement under which the sale of such Registrable Securities was registered under the Securities Act, any preliminary prospectus, final prospectus or summary prospectus contained in the Registration Statement, or any amendment or supplement to the Registration Statement, or arise out of or are based upon any omission or the alleged omission to state a material fact required to be stated therein or necessary to make the statement therein not misleading, if the statement or omission was made in reliance upon and in conformity with information furnished in writing to the Company by such selling holder expressly for use therein, and shall reimburse the Company, its directors and officers, and each other selling holder or controlling person for any legal or other expenses reasonably incurred by any of them in connection with investigation or defending any such loss, claim, damage, liability or action. Each selling holder’s indemnification obligations hereunder shall be several and not joint and shall be limited to the amount of any net proceeds actually received by such selling holder.

4.3 Conduct of Indemnification Proceedings. Promptly after receipt by any person of any notice of any loss, claim, damage or liability or any action in respect of which indemnity may be sought pursuant to Section 4.1 or 4.2, such person (the “Indemnified Party”) shall, if a claim in respect thereof is to be made against any other person for indemnification hereunder, notify such other person (the “Indemnifying Party” ) in writing of the loss, claim, judgment, damage, liability or action; provided, however, that the failure by the Indemnified Party to notify the Indemnifying Party shall not relieve the Indemnifying Party from any liability which the Indemnifying Party may have to such Indemnified Party hereunder, except and solely to the extent the Indemnifying Party is actually prejudiced by such failure. If the Indemnified Party is seeking indemnification with respect to any claim or action brought against the Indemnified Party, then the Indemnifying Party shall be entitled to participate in such claim or action, and, to the extent that it wishes, jointly with all other Indemnifying Parties, to assume control of the defense thereof with counsel satisfactory to the Indemnified Party. After notice from the Indemnifying Party to the Indemnified Party of its election to assume control of the defense of such claim or action, the Indemnifying Party shall not be liable to the Indemnified Party for any legal or other expenses subsequently incurred by the Indemnified Party in connection with the defense thereof other than reasonable costs of investigation; provided, however, that in any action in which both the Indemnified Party and the Indemnifying Party are named as defendants, the Indemnified Party shall have the right to employ separate counsel (but no more than one such separate counsel) to represent the Indemnified Party and its controlling persons who may be subject to liability arising out of any claim in respect of which indemnity may be sought by the Indemnified Party against the Indemnifying Party, with the fees and expenses of such counsel to be paid by such Indemnifying Party if, based upon the written opinion of counsel of such Indemnified Party, representation of both parties by the same counsel would be inappropriate due to actual or potential differing interests between them. No Indemnifying Party shall, without the prior written consent of the Indemnified Party, consent to entry of judgment or effect any settlement of any claim or pending or threatened proceeding in respect of which the Indemnified Party is or could have been a party and indemnity could have been sought hereunder by such Indemnified Party, unless such judgment or settlement includes an unconditional release of such Indemnified Party from all liability arising out of such claim or proceeding.

4.4 Contribution.

4.4.1 If the indemnification provided for in the foregoing Sections 4.1, 4.2 and 4.3 is unavailable to any Indemnified Party in respect of any loss, claim, damage, liability or action referred to herein, then each such Indemnifying Party, in lieu of indemnifying such Indemnified Party, shall contribute to the amount paid or payable by such Indemnified Party as a result of such loss, claim, damage, liability or action in such proportion as is appropriate to reflect the relative fault of the Indemnified Parties and the Indemnifying Parties in connection with the actions or omissions which resulted in such loss, claim, damage, liability or action, as well as any other relevant equitable considerations. The relative fault of any Indemnified Party and any Indemnifying Party shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by such Indemnified Party or such Indemnifying Party and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission.

4.4.2 The parties hereto agree that it would not be just and equitable if contribution pursuant to this Section 4.4 were determined by pro rata allocation or by any other method of allocation which does not take account of the equitable considerations referred to in the immediately preceding Section 4.4.1.

4.4.3 The amount paid or payable by an Indemnified Party as a result of any loss, claim, damage, liability or action referred to in the immediately preceding paragraph shall be deemed to include, subject to the limitations set forth above, any legal or other expenses incurred by such Indemnified Party in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this Section 4.4, no holder of Registrable Securities shall be required to contribute any amount in excess of the dollar amount of the net proceeds (after payment of any underwriting fees, discounts, commissions or taxes) actually received by such holder from the sale of Registrable Securities which gave rise to such contribution obligation. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation.

5. RULE 144.

5.1 Rule 144. The Company covenants that it shall file any reports required to be filed by it under the Securities Act and the Exchange Act and shall take such further action as the holders of Registrable Securities may reasonably request, all to the extent required from time to time to enable such holders to sell Registrable Securities without registration under the Securities Act within the limitation of the exemptions provided by Rule 144 under the Securities Act, as such Rules may be amended from time to time, or any similar rule or regulation hereafter adopted by the Commission.

6. MISCELLANEOUS.

6.1 Other Registration Rights. The Company represents and warrants that, except as disclosed in the Company’s registration statement on Form S-1 (File No. 333-256449), no person, other than the holders of the Registrable Securities, has any right to require the Company to register any of the Company’s share capital for sale or to include the Company’s share capital in any registration filed by the Company for the sale of share capital for its own account or for the account of any other person.

6.2 Assignment; No Third Party Beneficiaries. This Agreement and the rights, duties and obligations of the Company hereunder may not be assigned or delegated by the Company in whole or in part. This Agreement and the rights, duties and obligations of the holders of Registrable Securities hereunder may be freely assigned or delegated by such holder of Registrable Securities in conjunction with and to the extent of any transfer of Registrable Securities by any such holder. This Agreement and the provisions hereof shall be binding upon and shall inure to the benefit of each of the parties, to the permitted assigns of the Investors or holder of Registrable Securities or of any assignee of the Investors or holder of Registrable Securities. This Agreement is not intended to confer any rights or benefits on any persons that are not party hereto other than as expressly set forth in Article 4 and this Section 6.2.

6.3 Notices. All notices, demands, requests, consents, approvals or other communications (collectively, “Notices” ) required or permitted to be given hereunder or which are given with respect to this Agreement shall be in writing and shall be personally served, delivered by reputable air courier service with charges prepaid, or transmitted by hand delivery, telegram, telex or facsimile, addressed as set forth below, or to such other address as such party shall have specified most recently by written notice. Notice shall be deemed given on the date of service or transmission if personally served or transmitted by telegram, telex or facsimile; provided, that if such service or transmission is not on a business day or is after normal business hours, then such notice shall be deemed given on the next business day. Notice otherwise sent as provided herein shall be deemed given on the next business day following timely delivery of such notice to a reputable air courier service with an order for next-day delivery.

To the Company:

Mountain Crest Acquisition Corp. IV

311 West 43rd Street, 12th Floor

New York, NY 10036

Attn: Suying Liu, Chief Executive Officer

with a copy to:

Loeb & Loeb LLP

345 Park Avenue

New York, NY 10154

Attn: Giovanni Caruso, Esq.

To an Investor, to the address set forth below such Investor’s name on Exhibit A hereto.

6.4 Severability. This Agreement shall be deemed severable, and the invalidity or unenforceability of any term or provision hereof shall not affect the validity or enforceability of this Agreement or of any other term or provision hereof. Furthermore, in lieu of any such invalid or unenforceable term or provision, the parties hereto intend that there shall be added as a part of this Agreement a provision as similar in terms to such invalid or unenforceable provision as may be possible that is valid and enforceable.

6.5 Counterparts. This Agreement may be executed in multiple counterparts, each of which shall be deemed an original, and all of which taken together shall constitute one and the same instrument.

6.6 Entire Agreement. This Agreement (including all agreements entered into pursuant hereto and all certificates and instruments delivered pursuant hereto and thereto) constitute the entire agreement of the parties with respect to the subject matter hereof and supersede all prior and contemporaneous agreements, representations, understandings, negotiations and discussions between the parties, whether oral or written.

6.7 Modifications and Amendments. No amendment, modification or termination of this Agreement shall be binding upon the Company unless executed in writing by the Company. No amendment, modification or termination of this Agreement shall be binding upon the holders of the Registrable Securities unless executed in writing by the holders of the majority Registrable Securities.

6.8 Titles and Headings. Titles and headings of sections of this Agreement are for convenience only and shall not affect the construction of any provision of this Agreement.

6.9 Waivers and Extensions. Any party to this Agreement may waive any right, breach or default which such party has the right to waive, provided that such waiver will not be effective against the waiving party unless it is in writing, is signed by such party, and specifically refers to this Agreement. Waivers may be made in advance or after the right waived has arisen or the breach or default waived has occurred. Any waiver may be conditional. No waiver of any breach of any agreement or provision herein contained shall be deemed a waiver of any preceding or succeeding breach thereof nor of any other agreement or provision herein contained. No waiver or extension of time for performance of any obligations or acts shall be deemed a waiver or extension of the time for performance of any other obligations or acts.

6.10 Remedies Cumulative. In the event that the Company fails to observe or perform any covenant or agreement to be observed or performed under this Agreement, the Investor or any other holder of Registrable Securities may proceed to protect and enforce its rights by suit in equity or action at law, whether for specific performance of any term contained in this Agreement or for an injunction against the breach of any such term or in aid of the exercise of any power granted in this Agreement or to enforce any other legal or equitable right, or to take any one or more of such actions, without being required to post a bond. None of the rights, powers or remedies conferred under this Agreement shall be mutually exclusive, and each such right, power or remedy shall be cumulative and in addition to any other right, power or remedy, whether conferred by this Agreement or now or hereafter available at law, in equity, by statute or otherwise.

6.11 Governing Law. This Agreement shall be governed by, interpreted under, and construed in accordance with the internal laws of the State of New York applicable to agreements made and to be performed within the State of New York, without giving effect to any choice-of-law provisions thereof that would compel the application of the substantive laws of any other jurisdiction.

6.12 Waiver of Trial by Jury. Each party hereby irrevocably and unconditionally waives the right to a trial by jury in any action, suit, counterclaim or other proceeding (whether based on contract, tort or otherwise) arising out of, connected with or relating to this Agreement, the transactions contemplated hereby, or the actions of the Investor in the negotiation, administration, performance or enforcement hereof.

[REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

IN WITNESS WHEREOF, the parties have caused this Registration Rights Agreement to be executed and delivered by their duly authorized representatives as of the date first written above.

EXHIBIT A

Name and Address of Investors

To all Investors:

Exhibit 10.5

FORM OF INDEMNITY AGREEMENT

THIS INDEMNITY AGREEMENT (this “Agreement”) is made as of June 29, 2021, by and between Mountain Crest Acquisition Corp. IV, a Delaware corporation (the “Company”), and the undersigned directors and officers if the Company (“Indemnitee”).

RECITALS

WHEREAS, highly competent persons have become more reluctant to serve publicly held corporations as directors, officers or in other capacities unless they are provided with adequate protection through insurance or adequate indemnification against inordinate risks of claims and actions against them arising out of their service to and activities on behalf of such corporations.

WHEREAS, the Board of Directors of the Company (the “Board”) has determined that, in order to attract and retain qualified individuals, the Company will attempt to maintain on an ongoing basis, at its sole expense, liability insurance to protect persons serving the Company and its Subsidiaries (as defined below) from certain liabilities. Although the furnishing of such insurance has been a customary and widespread practice among United States-based corporations and other business enterprises, the Company believes that, given current market conditions and trends, such insurance may be available to it in the future only at higher premiums and with more exclusions. At the same time, directors, officers and other persons in service to corporations or business enterprises are being increasingly subjected to expensive and time-consuming litigation relating to, among other things, matters that traditionally would have been brought only against the Company or business enterprise itself. The Amended and Restated Certificate of Incorporation (the “Charter”) and the Bylaws (the “Bylaws”) of the Company require indemnification of the officers and directors of the Company. Indemnitee may also be entitled to indemnification pursuant to applicable provisions of the Delaware General Corporation Law (“DGCL”). The Bylaws and the DGCL expressly provide that the indemnification provisions set forth therein are not exclusive, and thereby contemplate that contracts may be entered into between the Company and members of the board of directors, officers and other persons with respect to indemnification, hold harmless, exoneration, advancement and reimbursement rights.

WHEREAS, the uncertainties relating to such insurance and to indemnification have increased the difficulty of attracting and retaining such persons.

WHEREAS, the Board has determined that the increased difficulty in attracting and retaining such persons is detrimental to the best interests of the Company’s stockholders and that the Company should act to assure such persons that there will be increased certainty of such protection in the future.

WHEREAS, it is reasonable, prudent and necessary for the Company contractually to obligate itself to indemnify, hold harmless, exonerate and to advance expenses on behalf of, such persons to the fullest extent permitted by applicable law so that they will serve or continue to serve the Company free from undue concern that they will not be so protected against liabilities.

WHEREAS, this Agreement is a supplement to and in furtherance of the Charter and Bylaws of the Company and any resolutions adopted pursuant thereto, and shall not be deemed a substitute therefor, nor to diminish or abrogate any rights of Indemnitee thereunder.

WHEREAS, Indemnitee may not be willing to serve as an officer or director without adequate protection, and the Company desires Indemnitee to serve in such capacity. Indemnitee is willing to serve, continue to serve and to take on additional service for or on behalf of the Company on the condition that he or she be so indemnified.

NOW, THEREFORE, in consideration of the premises and the covenants contained herein, the Company and Indemnitee do hereby covenant and agree as follows:

TERMS AND CONDITIONS

(a) References to “agent” shall mean any person who is or was a director, officer or employee of the Company or a Subsidiary of the Company or other person authorized by the Company to act for the Company, to include such person serving in such capacity as a director, officer, employee, fiduciary or other official of another corporation, partnership, limited liability company, joint venture, trust or other enterprise at the request of, for the convenience of, or to represent the interests of the Company or a Subsidiary of the Company.

(b) The terms “Beneficial Owner” and “Beneficial Ownership” shall have the meanings set forth in Rule 13d-3 promulgated under the Exchange Act (as defined below) as in effect on the date hereof.

(c) A “Change in Control” shall be deemed to occur upon the earliest to occur after the date of this Agreement of any of the following events:

(i) Acquisition of Stock by Third Party. Other than Network 1 Financial Securities, Inc. (the “Underwriter”) or an affiliate thereof, any Person (as defined below) is or becomes the Beneficial Owner, directly or indirectly, of securities of the Company representing fifteen percent (15%) or more of the combined voting power of the Company’s then outstanding securities entitled to vote generally in the election of directors, unless (1) the change in the relative Beneficial Ownership of the Company’s securities by any Person results solely from a reduction in the aggregate number of outstanding shares of securities entitled to vote generally in the election of directors, or (2) such acquisition was approved in advance by the Continuing Directors (as defined below) and such acquisition would not constitute a Change in Control under part (iii) of this definition;

(ii) Change in Board of Directors. Individuals who, as of the date hereof, constitute the Board, and any new director whose election by the Board or nomination for election by the Company’s stockholders was approved by a vote of at least two thirds of the directors then still in office who were directors on the date hereof or whose election for nomination for election was previously so approved (collectively, the “Continuing Directors”), cease for any reason to constitute at least a majority of the members of the Board;

(iii) Corporate Transactions. The effective date of a merger, share exchange, asset acquisition, stock purchase, recapitalization or other similar business combination involving the Company and one or more businesses or entities (a “Business Combination”), in each case, unless, following such Business Combination: (1) all or substantially all of the individuals and entities who were the Beneficial Owners of securities entitled to vote generally in the election of directors immediately prior to such Business Combination beneficially own, directly or indirectly, more than 51% of the combined voting power of the then outstanding securities of the Company entitled to vote generally in the election of directors resulting from such Business Combination (including, without limitation, a corporation which as a result of such transaction owns the Company or all or substantially all of the Company’s assets either directly or through one or more Subsidiaries) in substantially the same proportions as their ownership immediately prior to such Business Combination, of the securities entitled to vote generally in the election of directors; (2) other than the Underwriter or an affiliate thereof, no Person (excluding any corporation resulting from such Business Combination) is the Beneficial Owner, directly or indirectly, of 15% or more of the combined voting power of the then outstanding securities entitled to vote generally in the election of directors of the surviving corporation except to the extent that such ownership existed prior to the Business Combination; and (3) at least a majority of the Board of Directors of the corporation resulting from such Business Combination were Continuing Directors at the time of the execution of the initial agreement, or of the action of the Board of Directors, providing for such Business Combination;

(iv) Liquidation. The approval by the stockholders of the Company of a complete liquidation of the Company or an agreement or series of agreements for the sale or disposition by the Company of all or substantially all of the Company’s assets, other than factoring the Company’s current receivables or escrows due (or, if such approval is not required, the decision by the Board to proceed with such a liquidation, sale, or disposition in one transaction or a series of related transactions); or

(v) Other Events. There occurs any other event of a nature that would be required to be reported in response to Item 6(e) of Schedule 14A of Regulation 14A (or a response to any similar item on any similar schedule or form) promulgated under the Exchange Act (as defined below), whether or not the Company is then subject to such reporting requirement.

(d) ”Corporate Status” describes the status of a person who is or was a director, officer, trustee, general partner, manager, managing member, fiduciary, employee or agent of the Company or of any other Enterprise (as defined below) which such person is or was serving at the request of the Company.

(e) ”Delaware Court” shall mean the Court of Chancery of the State of Delaware.

(f) ”Disinterested Director” shall mean a director of the Company who is not and was not a party to the Proceeding (as defined below) in respect of which indemnification is sought by Indemnitee.

(g) ”Enterprise” shall mean the Company and any other corporation, constituent corporation (including any constituent of a constituent) absorbed in a consolidation or merger to which the Company (or any of its wholly owned Subsidiaries) is a party, limited liability company, partnership, joint venture, trust, employee benefit plan or other enterprise of which Indemnitee is or was serving at the request of the Company as a director, officer, trustee, general partner, managing member, fiduciary, employee or agent.

(h) ”Exchange Act” shall mean the Securities Exchange Act of 1934, as amended.

(i) ”Expenses” shall include all direct and indirect costs, fees and expenses of any type or nature whatsoever, including, without limitation, all reasonable attorneys’ fees and costs, retainers, court costs, transcript costs, fees of experts, witness fees, travel expenses, fees of private investigators and professional advisors, duplicating costs, printing and binding costs, telephone charges, postage, delivery service fees, fax transmission charges, secretarial services and all other disbursements, obligations or expenses in connection with prosecuting, defending, preparing to prosecute or defend, investigating, being or preparing to be a witness in, settlement or appeal of, or otherwise participating in, a Proceeding (as defined below), including reasonable compensation for time spent by the Indemnitee for which he or she is not otherwise compensated by the Company or any third party. Expenses also shall include Expenses incurred in connection with any appeal resulting from any Proceeding (as defined below), including without limitation the principal, premium, security for, and other costs relating to any cost bond, supersedeas bond, or other appeal bond or its equivalent. Expenses, however, shall not include amounts paid in settlement by Indemnitee or the amount of judgments or fines against Indemnitee.

(j) References to “fines” shall include any excise tax assessed on Indemnitee with respect to any employee benefit plan; references to “serving at the request of the Company” shall include any service as a director, officer, employee, agent or fiduciary of the Company which imposes duties on, or involves services by, such director, officer, employee, agent or fiduciary with respect to an employee benefit plan, its participants or beneficiaries; and if Indemnitee acted in good faith and in a manner Indemnitee reasonably believed to be in the best interests of the participants and beneficiaries of an employee benefit plan, Indemnitee shall be deemed to have acted in a manner “not opposed to the best interests of the Company” as referred to in this Agreement.

(k) ”Independent Counsel” shall mean a law firm or a member of a law firm with significant experience in matters of corporate law and that neither presently is, nor in the past five years has been, retained to represent: (i) the Company or Indemnitee in any matter material to either such party (other than with respect to matters concerning the Indemnitee under this Agreement, or of other indemnitees under similar indemnification agreements); or (ii) any other party to the Proceeding (as defined below) giving rise to a claim for indemnification hereunder. Notwithstanding the foregoing, the term “Independent Counsel” shall not include any person who, under the applicable standards of professional conduct then prevailing, would have a conflict of interest in representing either the Company or Indemnitee in an action to determine Indemnitee’s rights under this Agreement.

(l) The term “Person” shall have the meaning as set forth in Sections 13(d) and 14(d) of the Exchange Act as in effect on the date hereof; provided, however, that “Person” shall exclude: (i) the Company; (ii) any Subsidiaries (as defined below) of the Company; (iii) any employment benefit plan of the Company or of a Subsidiary (as defined below) of the Company or of any corporation owned, directly or indirectly, by the stockholders of the Company in substantially the same proportions as their ownership of stock of the Company; and (iv) any trustee or other fiduciary holding securities under an employee benefit plan of the Company or of a Subsidiary (as defined below) of the Company or of a corporation owned directly or indirectly by the stockholders of the Company in substantially the same proportions as their ownership of stock of the Company.

(m) The term “Proceeding” shall include any threatened, pending or completed action, suit, arbitration, mediation, alternate dispute resolution mechanism, investigation, inquiry, administrative hearing or any other actual, threatened or completed proceeding, whether brought in the right of the Company or otherwise and whether of a civil (including intentional or unintentional tort claims), criminal, administrative or investigative or related nature, in which Indemnitee was, is, will or might be involved as a party or a participant (as a witness or otherwise), by reason of his or her Corporate Status or by reason of any action (or failure to act) taken by him or of any action (or failure to act) on his part while acting as a director or officer of the Company, in each case whether or not serving in such capacity at the time any liability or expense is incurred for which indemnification, reimbursement, or advancement of expenses can be provided under this Agreement.

(n) The term “Subsidiary,” with respect to any Person, shall mean any corporation, limited liability company, partnership, joint venture, trust or other entity of which a majority of the voting power of the voting equity securities or equity interest is owned, directly or indirectly, by that Person.

(a) To the fullest extent permissible under applicable law, if the indemnification, hold harmless and/or exoneration rights provided for in this Agreement are unavailable to Indemnitee in whole or in part for any reason whatsoever, the Company, in lieu of indemnifying, holding harmless or exonerating Indemnitee, shall pay, in the first instance, the entire amount incurred by Indemnitee, whether for judgments, liabilities, fines, penalties, amounts paid or to be paid in settlement and/or for Expenses, in connection with any Proceeding without requiring Indemnitee to contribute to such payment, and the Company hereby waives and relinquishes any right of contribution it may have at any time against Indemnitee.

(b) The Company shall not enter into any settlement of any Proceeding in which the Company is jointly liable with Indemnitee (or would be if joined in such Proceeding) unless such settlement provides for a full and final release of all claims asserted against Indemnitee.

(c) The Company hereby agrees to fully indemnify, hold harmless and exonerate Indemnitee from any claims for contribution which may be brought by officers, directors or employees of the Company, other than Indemnitee, who may be jointly liable with Indemnitee.

(a) for which payment has actually been received by or on behalf of Indemnitee under any insurance policy or other indemnity provision, except with respect to any excess beyond the amount actually received under any insurance policy, contract, agreement, other indemnity provision or otherwise;

(b) for an accounting of profits made from the purchase and sale (or sale and purchase) by Indemnitee of securities of the Company within the meaning of Section 16(b) of the Exchange Act or similar provisions of state statutory law or common law; or

(c) except as otherwise provided in Sections 14(e)-(f) hereof, prior to a Change in Control, in connection with any Proceeding (or any part of any Proceeding) initiated by Indemnitee, including any Proceeding (or any part of any Proceeding) initiated by Indemnitee against the Company or its directors, officers, employees or other indemnitees, unless (i) the Board authorized the Proceeding (or any part of any Proceeding) prior to its initiation or (ii) the Company provides the indemnification, hold harmless or exoneration payment, in its sole discretion, pursuant to the powers vested in the Company under applicable law.

(a) Notwithstanding any provision of this Agreement to the contrary except for Section 27, and to the fullest extent not prohibited by applicable law, the Company shall pay the Expenses incurred by Indemnitee (or reasonably expected by Indemnitee to be incurred by Indemnitee within three months) in connection with any Proceeding within ten (10) days after the receipt by the Company of a statement or statements requesting such advances from time to time, prior to the final disposition of any Proceeding. Advances shall be unsecured and interest free. Advances shall be made without regard to Indemnitee’s ability to repay the Expenses and without regard to Indemnitee’s ultimate entitlement to be indemnified, held harmless or exonerated under the other provisions of this Agreement. Advances shall include any and all reasonable Expenses incurred pursuing a Proceeding to enforce this right of advancement, including Expenses incurred preparing and forwarding statements to the Company to support the advances claimed. To the fullest extent required by applicable law, such payments of Expenses in advance of the final disposition of the Proceeding shall be made only upon the Company’s receipt of an undertaking, by or on behalf of the Indemnitee, to repay the advance to the extent that it is ultimately determined that Indemnitee is not entitled to be indemnified by the Company under the provisions of this Agreement, the Charter, the Bylaws of the Company, applicable law or otherwise. This Section 10(a) shall not apply to any claim made by Indemnitee for which an indemnification, hold harmless or exoneration payment is excluded pursuant to Section 9.

(b) The Company will be entitled to participate in the Proceeding at its own expense.

(c) The Company shall not settle any action, claim or Proceeding (in whole or in part) which would impose any Expense, judgment, fine, penalty or limitation that is not entitled to be indemnified under this Agreement on the Indemnitee without the Indemnitee’s prior written consent.

(a) Indemnitee agrees to promptly notify the Company in writing upon being served with any summons, citation, subpoena, complaint, indictment, information or other document relating to any Proceeding or matter which may be subject to indemnification, hold harmless or exoneration rights, or advancement of Expenses covered hereunder. The failure of Indemnitee to so notify the Company shall not relieve the Company of any obligation which it may have to the Indemnitee under this Agreement, or otherwise.

(b) Indemnitee may deliver to the Company a written application to indemnify, hold harmless or exonerate Indemnitee in accordance with this Agreement. Such application(s) may be delivered from time to time and at such time(s) as Indemnitee deems appropriate in his or her sole discretion. Following such a written application for indemnification by Indemnitee, the Indemnitee’s entitlement to indemnification shall be determined according to Section 12(a) of this Agreement.

(a) A determination, if required by applicable law, with respect to Indemnitee’s entitlement to indemnification shall be made in the specific case by one of the following methods, which shall be at the election of Indemnitee: (i) by a majority vote of the Disinterested Directors, even though less than a quorum of the Board, (ii) by a committee of such directors designated by majority vote of such directors, or (iii) by Independent Counsel in a written opinion to the Board, a copy of which shall be delivered to Indemnitee. The Company will promptly advise Indemnitee in writing with respect to any determination that Indemnitee is or is not entitled to indemnification, including a description of any reason or basis for which indemnification has been denied. If it is so determined that Indemnitee is entitled to indemnification, payment to Indemnitee shall be made within ten (10) days after such determination. Indemnitee shall reasonably cooperate with the person, persons or entity making such determination with respect to Indemnitee’s entitlement to indemnification, including providing to such person, persons or entity upon reasonable advance request any documentation or information which is not privileged or otherwise protected from disclosure and which is reasonably available to Indemnitee and reasonably necessary to such determination. Any costs or Expenses (including reasonable attorneys’ fees and disbursements) incurred by Indemnitee in so cooperating with the person, persons or entity making such determination shall be borne by the Company (irrespective of the determination as to Indemnitee’s entitlement to indemnification) and the Company hereby agrees to indemnify and to hold Indemnitee harmless therefrom.

(b) In the event the determination of entitlement to indemnification is to be made by Independent Counsel pursuant to Section 12(a) hereof, the Independent Counsel shall be selected as provided in this Section 12(b). The Independent Counsel shall be selected by Indemnitee (unless Indemnitee shall request that such selection be made by the Board), and Indemnitee shall give written notice to the Company advising it of the identity of the Independent Counsel so selected and certifying that the Independent Counsel so selected meets the requirements of “Independent Counsel” as defined in Section 2 of this Agreement. If the Independent Counsel is selected by the Board, the Company shall give written notice to Indemnitee advising him of the identity of the Independent Counsel so selected and certifying that the Independent Counsel so selected meets the requirements of “Independent Counsel” as defined in Section 2 of this Agreement. In either event, Indemnitee or the Company, as the case may be, may, within ten (10) days after such written notice of selection shall have been received, deliver to the Company or to Indemnitee, as the case may be, a written objection to such selection; provided, however, that such objection may be asserted only on the ground that the Independent Counsel so selected does not meet the requirements of “Independent Counsel” as defined in Section 2 of this Agreement, and the objection shall set forth with particularity the factual basis of such assertion. Absent a proper and timely objection, the person so selected shall act as Independent Counsel. If such written objection is so made and substantiated, the Independent Counsel so selected may not serve as Independent Counsel unless and until such objection is withdrawn or a court of competent jurisdiction has determined that such objection is without merit. If, within twenty (20) days after submission by Indemnitee of a written request for indemnification pursuant to Section 11(b) hereof, no Independent Counsel shall have been selected and not objected to, either the Company or Indemnitee may petition the Delaware Court for resolution of any objection which shall have been made by the Company or Indemnitee to the other’s selection of Independent Counsel and/or for the appointment as Independent Counsel of a person selected by the Delaware Court, and the person with respect to whom all objections are so resolved or the person so appointed shall act as Independent Counsel under Section 12(a) hereof. Upon the due commencement of any judicial proceeding or arbitration pursuant to Section 14(a) of this Agreement, Independent Counsel shall be discharged and relieved of any further responsibility in such capacity (subject to the applicable standards of professional conduct then prevailing).

(c) The Company agrees to pay the reasonable fees and expenses of Independent Counsel and to fully indemnify and hold harmless such Independent Counsel against any and all Expenses, claims, liabilities and damages arising out of or relating to this Agreement or its engagement pursuant hereto.

(a) In making a determination with respect to entitlement to indemnification hereunder, the person, persons or entity making such determination shall presume that Indemnitee is entitled to indemnification under this Agreement if Indemnitee has submitted a request for indemnification in accordance with Section 11(b) of this Agreement, and the Company shall have the burden of proof to overcome that presumption in connection with the making by any person, persons or entity of any determination contrary to that presumption. Neither the failure of the Company (including by its directors or Independent Counsel) to have made a determination prior to the commencement of any action pursuant to this Agreement that indemnification is proper in the circumstances because Indemnitee has met the applicable standard of conduct, nor an actual determination by the Company (including by its directors or Independent Counsel) that Indemnitee has not met such applicable standard of conduct, shall be a defense to the action or create a presumption that Indemnitee has not met the applicable standard of conduct.

(b) If the person, persons or entity empowered or selected under Section 12 of this Agreement to determine whether Indemnitee is entitled to indemnification shall not have made a determination within thirty (30) days after receipt by the Company of the request therefor, the requisite determination of entitlement to indemnification shall be deemed to have been made and Indemnitee shall be entitled to such indemnification, absent (i) a misstatement by Indemnitee of a material fact, or an omission of a material fact necessary to make Indemnitee’s statement not materially misleading, in connection with the request for indemnification, or (ii) a final judicial determination that any or all such indemnification is expressly prohibited under applicable law; provided, however, that such 30-day period may be extended for a reasonable time, not to exceed an additional fifteen (15) days, if the person, persons or entity making the determination with respect to entitlement to indemnification in good faith require(s) such additional time for the obtaining or evaluating of documentation and/or information relating thereto.

(c) The termination of any Proceeding or of any claim, issue or matter therein, by judgment, order, settlement or conviction, or upon a plea of nolo contendere or its equivalent, shall not (except as otherwise expressly provided in this Agreement) of itself, favor or undermine the determination of, the right of Indemnitee to indemnification or create a presumption that Indemnitee did or did not act in good faith and in a manner which he or she reasonably believed to be in or not opposed to the best interests of the Company or, with respect to any criminal Proceeding, that Indemnitee had reasonable cause to believe that his or her conduct was unlawful.

(d) For purposes of any determination of good faith, Indemnitee shall be deemed to have acted in good faith if Indemnitee’s action is based on the records or books of account of the Enterprise, including financial statements, or on information supplied to Indemnitee by the directors, officers or managers of the Enterprise in the course of their duties, or on the advice of legal counsel for the Enterprise, its Board, any committee of the Board or any director, officer, trustee, general partner, manager or managing member, or on information or records given or reports made to the Enterprise, its Board, any committee of the Board or any director, officer, trustee, general partner, manager or managing member, by an independent certified public accountant or by an appraiser or other expert selected by the Enterprise, its Board, any committee of the Board or any director, officer, trustee, general partner, manager or managing member. The provisions of this Section 13(d) shall not be deemed to be exclusive or to limit in any way the other circumstances in which the Indemnitee may be deemed or found to have or have not met the applicable standard of conduct set forth in this Agreement.

(e) The knowledge and/or actions, or failure to act, of any other director, officer, trustee, partner, managing member, fiduciary, agent or employee of the Enterprise shall not be imputed to Indemnitee for purposes of determining the right to indemnification under this Agreement.

(a) In the event that (i) a determination is made pursuant to Section 12 of this Agreement that Indemnitee is not entitled to indemnification under this Agreement, (ii) advancement of Expenses, to the fullest extent permitted by applicable law, is not timely made pursuant to Section 10 of this Agreement, (iii) no determination of entitlement to indemnification shall have been made pursuant to Section 12(a) of this Agreement within the timeline set forth in this Agreement, (iv) payment of indemnification is not made pursuant to Section 5, 6, 7 or the last sentence of Section 12(a) of this Agreement within the timeline set forth in this Agreement, (v) a contribution payment is not made in a timely manner pursuant to Section 8 of this Agreement, (vi) payment of indemnification pursuant to Section 3 or 4 of this Agreement is not made within the timeline set forth in this Agreement, or (vii) payment to Indemnitee pursuant to any hold harmless or exoneration rights under this Agreement or otherwise is not made within the timeline set forth in this Agreement, Indemnitee shall be entitled to an adjudication by the Delaware Court to such indemnification, hold harmless, exoneration, contribution or advancement rights. Alternatively, Indemnitee, at his or her option, may seek an award in arbitration to be conducted by a single arbitrator pursuant to the Commercial Arbitration Rules of the American Arbitration Association. Except as set forth herein, the provisions of Delaware law (without regard to its conflict of laws rules) shall apply to any such arbitration. The Company shall not oppose Indemnitee’s right to seek any such adjudication or award in arbitration.

(b) In the event that a determination shall have been made pursuant to Section 12(a) of this Agreement that Indemnitee is not entitled to indemnification, any judicial proceeding or arbitration commenced pursuant to this Section 14 shall be conducted in all respects as a de novo trial, or arbitration, on the merits and Indemnitee shall not be prejudiced by reason of that adverse determination. In any judicial proceeding or arbitration commenced pursuant to this Section 14, Indemnitee shall be presumed to be entitled to be indemnified, held harmless, exonerated to receive advances of Expenses under this Agreement and the Company shall have the burden of proving Indemnitee is not entitled to be indemnified, held harmless, exonerated and to receive advances of Expenses, as the case may be, and the Company may not refer to or introduce into evidence any determination pursuant to Section 12(a) of this Agreement adverse to Indemnitee for any purpose. If Indemnitee commences a judicial proceeding or arbitration pursuant to this Section 14, Indemnitee shall not be required to reimburse the Company for any advances pursuant to Section 10 until a final determination is made with respect to Indemnitee’s entitlement to indemnification (as to which all rights of appeal have been exhausted or lapsed).

(c) If a determination shall have been made pursuant to Section 12(a) of this Agreement that Indemnitee is entitled to indemnification, the Company shall be bound by such determination in any judicial proceeding or arbitration commenced pursuant to this Section 14, absent (i) a misstatement by Indemnitee of a material fact, or an omission of a material fact necessary to make Indemnitee’s statement not materially misleading, in connection with the request for indemnification, or (ii) a prohibition of such indemnification under applicable law.

(d) The Company shall be precluded from asserting in any judicial proceeding or arbitration commenced pursuant to this Section 14 that the procedures and presumptions of this Agreement are not valid, binding and enforceable and shall stipulate in any such court or before any such arbitrator that the Company is bound by all the provisions of this Agreement.

(e) The Company shall indemnify and hold harmless Indemnitee to the fullest extent permitted by law against all Expenses and, if requested by Indemnitee, shall (within ten (10) days after the Company’s receipt of such written request) pay to Indemnitee, to the fullest extent permitted by applicable law, such Expenses which are incurred by Indemnitee in connection with any judicial proceeding or arbitration brought by Indemnitee (i) to enforce his or her rights under, or to recover damages for breach of, this Agreement or any other indemnification, hold harmless, exoneration, advancement or contribution agreement or provision of the Charter or the Bylaws now or hereafter in effect; or (ii) for recovery or advances under any insurance policy maintained by any person for the benefit of Indemnitee, regardless of the outcome and whether Indemnitee ultimately is determined to be entitled to such indemnification, hold harmless or exoneration right, advancement, contribution or insurance recovery, as the case may be (unless such judicial proceeding or arbitration was not brought by Indemnitee in good faith).

(f) Interest shall be paid by the Company to Indemnitee at the legal rate under Delaware law for amounts which the Company indemnifies, holds harmless or exonerates, contributes, reimburses, advances, or is obliged to indemnify, hold harmless, exonerate, contribute, reimburse or advance for the period commencing with the date on which the Indemnitee requests such indemnification, to be held harmless, exonerated, contribution, reimbursement or advancement of any Expenses and ending with the date on which such payment is made to Indemnitee by the Company.

(a) The rights of Indemnitee as provided by this Agreement shall not be deemed exclusive of any other rights to which Indemnitee may at any time be entitled under applicable law, the Charter, the Bylaws, any agreement, a vote of stockholders or a resolution of directors, or otherwise. No amendment, alteration or repeal of this Agreement or of any provision hereof shall limit or restrict any right of Indemnitee under this Agreement in respect of any Proceeding (regardless of when such Proceeding is first threatened, commenced or completed) or claim, issue or matter therein arising out of, or related to, any action taken or omitted by such Indemnitee in his Corporate Status prior to such amendment, alteration or repeal. To the extent that a change in applicable law, whether by statute or judicial decision, permits greater indemnification, hold harmless or exoneration rights or advancement of Expenses than would be afforded currently under the Charter, the Bylaws or this Agreement, then this Agreement (without any further action by the parties hereto) shall automatically be deemed to be amended to require that the Company indemnifies the Indemnitee to the fullest extent permitted by law. No right or remedy herein conferred is intended to be exclusive of any other right or remedy, and every other right and remedy shall be cumulative and in addition to every other right and remedy given hereunder or now or hereafter existing at law or in equity or otherwise,. The assertion or employment of any right or remedy hereunder, or otherwise, shall not prevent the concurrent assertion or employment of any other right or remedy.

(b) The DGCL and the Bylaws permit the Company to purchase and maintain insurance or furnish similar protection or make other arrangements including, but not limited to, providing a trust fund, letter of credit, or surety bond (“Indemnification Arrangements”) on behalf of Indemnitee against any liability asserted against him or her or incurred by or on behalf of him or her or in such capacity as a director, officer, employee or agent of the Company, or arising out of his or her status as such, whether or not the Company would have the power to indemnify him or her against such liability under the provisions of this Agreement or under the DGCL, as it may then be in effect. The purchase, establishment, and maintenance of any such Indemnification Arrangement shall not in any way limit or affect the rights and obligations of the Company or of the Indemnitee under this Agreement except as expressly provided herein, and the execution and delivery of this Agreement by the Company and the Indemnitee shall not in any way limit or affect the rights and obligations of the Company or the other party or parties thereto under any such Indemnification Arrangement.

(c) To the extent that the Company maintains an insurance policy or policies providing liability insurance for directors, officers, trustees, partners, managers, managing members, fiduciaries, employees, or agents of the Company or of any other Enterprise which such person serves at the request of the Company, Indemnitee shall be covered by such policy or policies in accordance with its or their terms to the maximum extent of the coverage available for any such director, officer, trustee, partner, manager, managing member, fiduciary, employee or agent under such policy or policies. If, at the time the Company receives notice from any source of a Proceeding as to which Indemnitee is a party or a participant (as a witness, deponent or otherwise), the Company has director and officer liability insurance in effect, the Company shall give prompt notice of such Proceeding to the insurers in accordance with the procedures set forth in the respective policies. The Company shall thereafter take all necessary or desirable action to cause such insurers to pay, on behalf of the Indemnitee, all amounts payable as a result of such Proceeding in accordance with the terms of such policies.

(d) In the event of any payment under this Agreement, the Company shall be subrogated to the extent of such payment to all of the rights of recovery of Indemnitee, who shall execute all papers required and take all action necessary to secure such rights, including execution of such documents as are necessary to enable the Company to bring suit to enforce such rights. No such payment by the Company shall be deemed to relieve any insurer of its obligations.

(e) The Company’s obligation to indemnify, hold harmless, exonerate or advance Expenses hereunder to Indemnitee who is or was serving at the request of the Company as a director, officer, trustee, partner, managing member, fiduciary, employee or agent of any other Enterprise shall be reduced by any amount Indemnitee has actually received as indemnification, hold harmless or exoneration payments or advancement of expenses from such Enterprise. Notwithstanding any other provision of this Agreement to the contrary except for Section 27, (i) the Indemnitee shall have no obligation to reduce, offset, allocate, pursue or apportion any indemnification, hold harmless, exoneration, advancement, contribution or insurance coverage among multiple parties possessing such duties to Indemnitee prior to the Company’s satisfaction and performance of all its obligations under this Agreement, and (ii) the Company shall perform fully its obligations under this Agreement without regard to whether Indemnitee holds, may pursue or has pursued any indemnification, advancement, hold harmless, exoneration, contribution or insurance coverage rights against any person or entity other than the Company.

(f) Notwithstanding anything contained herein, the Company is the primary indemnitor, and any indemnification or advancement obligation of the Underwriter, its affiliates or any other Person is secondary.

(a) The Company expressly confirms and agrees that it has entered into this Agreement and assumed the obligations imposed on it hereby in order to induce Indemnitee to serve as a director, officer or key employee of the Company, and the Company acknowledges that Indemnitee is relying upon this Agreement in serving as a director, officer or key employee of the Company.

(b) Without limiting any of the rights of Indemnitee under the Charter or Bylaws as they may be amended from time to time, this Agreement constitutes the entire agreement between the parties hereto with respect to the subject matter hereof and supersedes all prior agreements and understandings, oral, written and implied, between the parties hereto with respect to the subject matter hereof.

(c) The indemnification, hold harmless, exoneration and advancement of expenses rights provided by or granted pursuant to this Agreement shall be binding upon and be enforceable by the parties hereto and their respective successors and assigns (including any direct or indirect successor by purchase, merger, consolidation or otherwise to all or substantially all of the business or assets of the Company), shall continue as to an Indemnitee who has ceased to be a director, officer, employee or agent of the Company or a director, officer, trustee, general partner, manager, managing member, fiduciary, employee or agent of any other Enterprise at the Company’s request, and shall inure to the benefit of Indemnitee and his or her spouse, assigns, heirs, devisees, executors and administrators and other legal representatives.

(d) The Company shall require and cause any successor (whether direct or indirect by purchase, merger, consolidation or otherwise) to all, substantially all or a substantial part, of the business and/or assets of the Company, by written agreement in form and substance satisfactory to the Indemnitee, expressly to assume and agree to perform this Agreement in the same manner and to the same extent that the Company would be required to perform if no such succession had taken place.

(e) The Company and Indemnitee agree herein that a monetary remedy for breach of this Agreement, at some later date, may be inadequate, impracticable and difficult of proof, and further agree that such breach may cause Indemnitee irreparable harm. Accordingly, the parties hereto agree that Indemnitee may enforce this Agreement by seeking, among other things, injunctive relief and/or specific performance hereof, without any necessity of showing actual damage or irreparable harm and that by seeking injunctive relief and/or specific performance, Indemnitee shall not be precluded from seeking or obtaining any other relief to which he or she may be entitled. The Company and Indemnitee further agree that Indemnitee shall be entitled to such specific performance and injunctive relief, including temporary restraining orders, preliminary injunctions and permanent injunctions, without the necessity of posting bonds or other undertakings in connection therewith. The Company acknowledges that in the absence of a waiver, a bond or undertaking may be required of Indemnitee by the Delaware Court, and the Company hereby waives any such requirement of such a bond or undertaking.

(a) If to Indemnitee, at the address indicated on the signature page of this Agreement, or such other address as Indemnitee shall provide in writing to the Company.

(b) If to the Company, to:

Mountain Crest Acquisition Corp. IV
311 West 43rd Street, 12th Floor
New York, NY 10036
Attn: Suying Liu, Chief Executive Officer

or to any other address as may have been furnished to Indemnitee in writing by the Company.

(Signatures follow.)

IN WITNESS WHEREOF, the parties hereto have caused this Indemnity Agreement to be signed as of the day and year first above written.

[Signature page to Indemnity Agreement]

Exhibit 10.6

June 29, 2021

Mountain Crest Acquisition Corp. IV
311 West 43rd Street, 12th Floor
New York, NY 10036

Ladies and Gentlemen:

Mountain Crest Acquisition Corp. IV (the “Company”), a blank check company formed for the purpose of acquiring one or more businesses or entities (a “Business Combination”), intends to register its securities under the Securities Act of 1933, as amended (“Securities Act”), in connection with its initial public offering (“IPO”), pursuant to a registration statement on Form S-1 (“Registration Statement”).

The undersigned hereby commits that it will purchase 195,000 units of the Company (“Placement Units”), each Placement Unit consisting of one share of common stock of the Company, $0.0001 par value (the “Common Stock”) and one right to receive one-tenth of one share of common stock upon the consummation of an initial Business Combination, at $10.00 per Placement Unit, for a purchase price of $1,950,000 (the “Placement Unit Purchase Price”).

The undersigned hereby agrees that it will purchase an additional amount of units of the Company (“Over-Allotment Units”), up to a maximum of 15,000 Over-Allotment Units, or a maximum purchase price of $150,000 (“Over-Allotment Unit Purchase Price”, together with the Placement Unit Purchase Price, the “Purchase Price”) so that at least $10.00 per share sold to the public in the IPO is held in the trust account (as described in the Registration Statement, the “Trust Account”) regardless of whether the over-allotment option is exercised in full or in part.

At least twenty-four (24) hours prior to the pricing of the IPO, the undersigned will cause the Placement Unit Purchase Price to be delivered to an escrow account with Loeb & Loeb LLP (“Loeb”).

The consummation of the purchase and issuance of the Placement Units shall occur simultaneously with the consummation of the IPO and the consummation of the purchase and issuance of the Over-Allotment Units shall occur simultaneously with the closing of any exercise of the over-allotment option related to the IPO. Simultaneously with or prior to the consummation of the IPO, Loeb shall deposit the Private Unit Purchase Price, without interest or deduction, into the Trust Account.

Each of the Company, and the undersigned acknowledges and agrees that Loeb is serving hereunder solely as a convenience to the parties to facilitate the purchase of the Placement Units and Loeb’s sole obligation under this letter agreement is to act with respect to holding and disbursing the Purchase Price for the Placement Units as described above. Loeb shall not be liable to the Company, the Underwriter or the undersigned or any other person or entity in respect of any act or failure to act hereunder or otherwise in connection with performing its services hereunder unless Loeb has acted in a manner constituting gross negligence or willful misconduct. The Company and the undersigned shall indemnify Loeb against any claim made against it (including reasonable attorney’s fees) by reason of it acting or failing to act in connection with this letter agreement except as a result of its gross negligence or willful misconduct. Loeb may rely and shall be protected in acting or refraining from acting upon any written notice, instruction or request furnished to it hereunder and believed by it to be genuine and to have been signed or presented by the proper party or parties.

The Units and Over-Allotment Units will be identical to the units to be sold by the Company in the IPO. Additionally, the undersigned agrees:

The undersigned acknowledges and agrees that the purchaser of the Placement Units and Over-Allotment Units will execute agreements in form and substance typical for transactions of this nature necessary to effectuate the foregoing agreements and obligations prior to the consummation of the IPO as are reasonably acceptable to the undersigned, including but not limited to an insider letter.

The undersigned hereby represents and warrants that:

This letter agreement constitutes the entire agreement between the undersigned and the Company with respect to the purchase of the Placement Units and Over-Allotment Units, and supersedes all prior and contemporaneous understandings, agreements, representations and warranties, both written and oral, with respect to the same.

Exhibit 10.7

MOUNTAIN CREST ACQUISITION CORP. IV
311 West 43rd Street, 12th Floor
New York, NY 10036

June 29, 2021

Mountain Crest Holdings IV LLC
311 West 43rd Street, 12th Floor
New York, NY 10036

Ladies and Gentlemen:

This letter will confirm our agreement that, commencing on the effective date (the “Effective Date”) of the registration statement (the “Registration Statement”) for the initial public offering (the “IPO”) of the securities of Mountain Crest Acquisition Corp. IV (the “Company”) and continuing until the earlier of (i) the consummation by the Company of an initial business combination or (ii) the Company’s liquidation (in each case as described in the Registration Statement) (such earlier date hereinafter referred to as the “Termination Date”), Mountain Crest Holdings IV LLC (“Sponsor”) shall make available to the Company certain office space, secretarial and administrative services as may be required by the Company from time to time, situated at 311 West 43rd Street, 12th Floor, New York, NY 10036 (or any successor location). In exchange therefore, the Company shall pay Sponsor a sum not to exceed $10,000 per month, respectively, on the Effective Date and continuing monthly thereafter until the Termination Date. Sponsor hereby agrees that it does not have any right, title, interest or claim of any kind in or to any monies that may be set aside in a trust account (the “Trust Account”) that may be established by the Company for the benefit of the Company’s public stockholders upon the consummation of the IPO as described in the Registration Statement (“Claim”) and hereby waives any Claim it may have in the future as a result of, or arising out of, any negotiations, contracts or agreements with the Company and will not seek recourse against the Trust Account for any reason whatsoever.