Exhibit 10.2

    

  

   

  

  
    [DATE]

    

    

    North Mountain Merger Corp.

    767 Fifth Avenue, 9th Floor

    New York, NY 10153

    

    

    Re:          Initial Public Offering

    

    

    Ladies and Gentlemen:

    

    

    This letter (this “Letter Agreement”) is being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”) to be entered into by and among North Mountain Merger Corp., a
      Delaware corporation (the “Company”) and Citigroup Global Markets Inc. (the “Representative”), relating to an underwritten initial public offering (the “Public Offering”), of 13,225,000 of the Company’s units (including up to
      1,725,000 units that may be purchased to cover over-allotments, if any) (the “Units”), each comprised of one share of the Company’s Class A common stock, par value $0.0001 per share (the “Common Stock”), and one-half of one redeemable
      warrant.  Each whole Warrant (each, a “Warrant”) entitles the holder thereof to purchase one share of Common Stock at a price of $11.50 per share, subject to adjustment.  The Units will be sold in the Public Offering pursuant to a registration
      statement on Form S-1 and prospectus (the “Prospectus”) filed by the Company with the U.S. Securities and Exchange Commission (the “Commission”) and the Company has applied to have the Units listed on the Nasdaq.  Certain capitalized
      terms used herein are defined in paragraph 11 hereof.

    

    

    In order to induce the Company and the Representative to enter into the Underwriting Agreement and to proceed with the Public Offering and for other good and valuable consideration, the receipt and sufficiency of which
      are hereby acknowledged, North Mountain LLC (the “Sponsor”) and each of the undersigned individuals, each of whom is a member of the Company’s board of directors and/or management team (each, an “Insider” and collectively, the “Insiders”),
      which term, for the avoidance of doubt, shall not include the Sponsor or any members or managers of the Sponsor other than those members or managers who are also members of the Company’s board of directors and/or management team)), hereby severally
      (and not jointly and severally) agrees with the Company as follows:

    

    

    1.          The Sponsor and each Insider agrees that if the Company seeks stockholder approval of a proposed Business Combination, then in connection with such proposed Business Combination, it, he or
      she shall (i) vote any shares of Capital Stock owned by it, him or her in favor of any proposed Business Combination and (ii) not redeem any shares of Common Stock owned by it, him or her in connection with such stockholder approval. If the Company
      seeks to consummate a proposed Business Combination by engaging in a tender offer, the Sponsor and each Insider agrees that it, he or she will not sell or tender any shares of Capital Stock owned by it, him or her in connection therewith.

    

    

    
      
        


    

    
    2.          The Sponsor and each Insider hereby agrees that in the event that the Company fails to consummate a Business Combination within 24 months from the closing of the Public Offering, or such
      later period approved by the Company’s stockholders in accordance with the Company’s amended and restated certificate of incorporation (the “Charter”), the Sponsor and each Insider shall take all reasonable steps to cause the Company to (i)
      cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but not more than 10 business days thereafter, subject to lawfully available funds therefor, redeem 100% of the Common Stock sold as part of the Units
      in the Public Offering (the “Offering Shares”), at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest (net of amounts withdrawn to fund the Company’s working capital
      requirements, subject to an annual limit of $[•], and/or to pay the Company’s taxes (“Permitted Withdrawals”)) and less up to $100,000 of interest to pay dissolution expenses)), divided by the number of then outstanding Offering Shares, which
      redemption will completely extinguish all Public Stockholders’ rights as stockholders (including the right to receive further liquidating distributions, if any), subject to applicable law, and (iii) as promptly as reasonably possible following such
      redemption, subject to the approval of the Company’s remaining stockholders and the Company’s board of directors, dissolve and liquidate, subject in each case to the Company’s obligations under Delaware law to provide for claims of creditors and
      other requirements of applicable law.  The Sponsor and each Insider agree to not propose any amendment to the Charter that would modify the substance or timing of the Company’s obligation to redeem 100% of the Offering Shares if the Company does not
      complete a Business Combination within the required time period set forth in the Charter or with respect to any other material provisions relating to stockholders’ rights or pre-initial business combination activity, unless the Company provides its
      Public Stockholders with the opportunity to redeem their Offering Shares upon approval of any such amendment at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest (net of
      Permitted Withdrawals), divided by the number of then outstanding Offering Shares.

    

    

    The Sponsor and each Insider acknowledges that it, he or she has no right, title, interest or claim of any kind in or to any monies held in the Trust Account as a result of any liquidation of the
      Company with respect to the Founder Shares held by it, him or her.  The Sponsor and each Insider hereby further waive, with respect to any shares of Common Stock held by it, him or her, if any, any redemption rights it, he or she may have in
      connection with the consummation of a Business Combination, including, without limitation, any such rights available in the context of a stockholder vote to approve such Business Combination or in the context of a tender offer made by the Company to
      purchase shares of Common Stock (although the Sponsor, the Insiders and their respective affiliates shall be entitled to redemption and liquidation rights with respect to any Offering Shares it or they hold if the Company fails to consummate a
      Business Combination within the time period set forth in the Charter or in connection with a stockholder vote to approve an amendment to the Charter to modify the substance or timing of the Company’s obligation to redeem 100% of the Offering Shares
      if the Company does not complete a Business Combination within the time period set forth in the Charter or with respect to any other material provisions relating to stockholders’ rights or pre-initial business combination activity).

    

    

    
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    3.          During the period commencing on the effective date of the Underwriting Agreement and ending 180 days after such date, the Sponsor and each Insider shall not, without the prior written
      consent of the Representative, (i) sell, offer to sell, contract or agree to sell, hypothecate, pledge, grant any option to purchase or otherwise dispose of or agree to dispose of, directly or indirectly, or establish or increase a put equivalent
      position or liquidate or decrease a call equivalent position within the meaning of Section 16 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and the rules and regulations of the Commission promulgated thereunder, with
      respect to any Units, shares of Capital Stock, Warrants or any securities convertible into, or exercisable, or exchangeable for, shares of Common Stock owned by it, him or her, (ii) enter into any swap or other arrangement that transfers to another,
      in whole or in part, any of the economic consequences of ownership of any Units, shares of Capital Stock, Warrants or any securities convertible into, or exercisable, or exchangeable for, shares of Common Stock owned by it, him or her, whether any
      such transaction is to be settled by delivery of such securities, in cash or otherwise, or (iii) publicly announce any intention to effect any transaction specified in clause (i) or (ii).  Each of the Insiders and the Sponsor acknowledges and agrees
      that, prior to the effective date of any release or waiver of the restrictions set forth in this paragraph 3 or paragraph 7 below, the Company shall announce the impending release or waiver by press release through a major news service at least two
      business days before the effective date of the release or waiver.  Any such release or waiver granted shall only be effective two business days after the publication date of such press release.  The provisions of this paragraph will not apply if (i)
      the release or waiver is effected solely to permit a transfer of securities without consideration and (ii) the transferee has agreed in writing to be bound by the same terms described in this Letter Agreement to the extent and for the duration that
      such terms remain in effect at the time of the transfer.

    

    

    4.          In the event of the liquidation of the Trust Account, the Sponsor (which for purposes of clarification shall not extend to any other shareholders, members or managers of the Sponsor or any
      other Insider) agrees to indemnify and hold harmless the Company against any and all loss, liability, claim, 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) to which the Company may become subject as a result of any claim by (i) any third party for services rendered or products sold to the Company or
      (ii) any prospective target business with which the Company has entered into a letter of intent, confidentiality or other similar agreement for a Business Combination (a “Target”); provided, however, that such indemnification
      of the Company by the Sponsor (x) shall apply only to the extent necessary to ensure that such claims by a third party or a Target do not reduce the amount of funds in the Trust Account to below the lesser of (i) $10.00 per Offering Share or (ii) the
      actual amount per Offering Share held in the Trust Account as of the date of the liquidation of the Trust Account, if less than $10.00 per Offering Share is then held in the Trust Account due to reductions in the value of the trust assets less
      Permitted Withdrawals, (y) shall not apply to any claims by a third party (including a Target) that executed a waiver of any and all rights to the monies held in the Trust Account (whether or not such waiver is enforceable) and (z) shall not apply to
      any claims under the Company’s indemnity of the Representative against certain liabilities, including liabilities under the Securities Act of 1933, as amended.  The Sponsor shall have the right to defend against any such claim with counsel of its
      choice reasonably satisfactory to the Company if, within 15 days following written receipt of notice of the claim to the Sponsor, the Sponsor notifies the Company in writing that it shall undertake such defense.  For the avoidance of doubt, none of
      the Company’s officers or directors will indemnify the Company for claims by third parties, including, without limitation, claims by vendors and prospective target businesses.

    

    

    
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    5.          To the extent that the Representative does not exercise its over-allotment option to purchase up to an additional 1,725,000 Units within 45 days from the date of the Prospectus (and as
      further described in the Prospectus), the Sponsor agrees to forfeit, at no cost, a number of Founder Shares in the aggregate equal to the product of 431,250 multiplied by a fraction, (i) the numerator of which is 1,725,000 minus the number of Units
      purchased by the Representative upon the exercise of its over-allotment option, and (ii) the denominator of which is 1,725,000. The forfeiture will be adjusted to the extent that the over-allotment option is not exercised in full by the
      Representative so that the Initial Stockholders will own an aggregate of 20.0% of the Company’s issued and outstanding shares of Capital Stock after the Public Offering.  To the extent that the size of the Public Offering is increased or decreased,
      the Company will effect a capitalization or share repurchase, redemption or stock split or other appropriate mechanism, as applicable, immediately prior to the consummation of the Public Offering in such amount as to maintain the ownership of the
      Capital Stock of the Initial Stockholders prior to the Public Offering at 20.0% of the Company’s issued and outstanding Capital Stock upon the consummation of the Public Offering.  In connection with such increase or decrease in the size of the
      Public Offering, (A) references to 1,725,000 in the numerator and denominator of the formula in the first sentence of this paragraph shall be changed to a number equal to 15% of the number of shares included in the Units issued in the Public Offering
      and (B) the reference to 431,250 in the formula set forth in the immediately preceding sentence shall be adjusted to such number of Founder Shares that the Sponsor would have to return to the Company in order to hold (with all of the Initial
      Stockholders) an aggregate of 20.0% of the Company’s issued and outstanding Capital Stock after the Public Offering.

    

    

    6.          The Sponsor and each Insider hereby agrees and acknowledges that: (i) the Representative and the Company would be irreparably injured in the event of a breach by such Sponsor or an Insider
      of its, his or her obligations under paragraphs 1, 2, 3, 4, 5, 7(a), 7(b), and 9, as applicable, of this Letter Agreement (ii) monetary damages may not be an adequate remedy for such breach and (iii) the non-breaching party shall be entitled to
      injunctive relief, in addition to any other remedy that such party may have in law or in equity, in the event of such breach.

    

    

    7.          (a)         The Sponsor and each Insider agree that it or he shall not Transfer any Founder Shares (or shares of Common Stock issuable upon conversion thereof) until the earlier of (A) one
      year after the completion of the Company’s initial Business Combination or (B) subsequent to the Business Combination, (x) if the closing price of the Common Stock equals or exceeds $12.00 per share (as adjusted for stock splits, stock dividends,
      reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 150 days after the Company’s initial Business Combination or (y) the date on which the Company completes a liquidation,
      merger, capital stock exchange, reorganization or other similar transaction that results in all of the Company’s stockholders having the right to exchange their shares of Common Stock for cash, securities or other property (the “Founder Shares
        Lock-up Period”).

    

    

    (b)        The Sponsor and each Insider agree that it, he or she shall not Transfer any Private Placement Warrants (or shares of Common Stock issued or issuable upon the exercise of the Private
      Placement Warrants) until 30 days after the completion of a Business Combination (the “Private Placement Warrants Lock-up Period”, together with the Founder Shares Lock-up Period, the “Lock-up Periods”).

    

    

    (c)          Notwithstanding the provisions set forth in paragraphs 3 and 7(a) and (b), Transfers of the Founder Shares, Private Placement Warrants and shares of Common Stock issued or issuable upon
      the exercise or conversion of the Private Placement Warrants or the Founder Shares and that are held by the Sponsor, any Insider or any of their permitted transferees (that have complied with this paragraph 7(c)), are permitted (a) to the Company’s
      officers or directors, any affiliates or family members of any of the Company’s officers or directors, any members of the Sponsor, or any affiliates of the Sponsor; (b) in the case of an individual, transfers by gift to a member of the individual’s
      immediate family, to a trust, the beneficiary of which is a member of the individual’s immediate family or an affiliate of such person, or to a charitable organization; (c) in the case of an individual, transfers by virtue of laws of descent and
      distribution upon death of the individual; (d) in the case of an individual, transfers pursuant to a qualified domestic relations order; (e) transfers by private sales or transfers made in connection with the consummation of a Business Combination at
      prices no greater than the price at which the securities were originally purchased; (f) transfers in the event of the Company’s liquidation prior to the completion of an initial Business Combination; (g) transfers by virtue of the laws of the State
      of Delaware or the Sponsor’s limited liability company agreement upon dissolution of the Sponsor; (h) in the event of the Company’s completion of a liquidation, merger, stock exchange, reorganization or other similar transaction which results in all
      of the Company’s public stockholders having the right to exchange their shares of Class A common stock for cash, securities or other property subsequent to the completion of the initial business combination; (i) to a nominee or custodian of a person
      or entity to whom a disposition or transfer would be permissible under clauses (a) through (h) above; provided, however, that in the case of clauses (a) through (e) and (i), these permitted transferees must enter into a written
      agreement with the Company agreeing to be bound by the transfer restrictions herein and the other restrictions contained in this Agreement (including provisions relating to voting, the Trust Account and liquidating distributions).

    

    

    
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    8.          The Sponsor and each Insider represent and warrant that it, he or she has never been suspended or expelled from membership in any securities or commodities exchange or association or had a
      securities or commodities license or registration denied, suspended or revoked.  Each Insider’s biographical information furnished to the Company (including any such information included in the Prospectus) is true and accurate in all respects and
      does not omit any material information with respect to the Insider’s background.  The Sponsor and each Insider’s questionnaire furnished to the Company is true and accurate in all respects.  The Sponsor and each Insider represents and warrants that:
      it, he or she is not subject to or a respondent in any legal action for, any injunction, cease-and-desist order or order or stipulation to desist or refrain from any act or practice relating to the offering of securities in any jurisdiction; it, he
      or she has never been convicted of, or pleaded guilty to, any crime (i) involving fraud, (ii) relating to any financial transaction or handling of funds of another person, or (iii) pertaining to any dealings in any securities and it, he or she is not
      currently a defendant in any such criminal proceeding.

    

    

    9.          Except as disclosed in the Prospectus, neither any Sponsor nor any Insider nor any affiliate of the Sponsor or any Insider, nor any director or officer of the Company, shall receive from
      the Company any finder’s fee, reimbursement, consulting fee, monies in respect of any repayment of a loan or other compensation prior to, or in connection with any services rendered in order to effectuate the consummation of the Company’s initial
      Business Combination (regardless of the type of transaction that it is), other than the following, none of which will be made from the proceeds held in the Trust Account prior to the completion of the initial Business Combination: repayment of a loan
      and advances of up to $300,000 made to the Company by the Sponsor to cover expenses related to the organization of the Company and the Public Offering; payment to an affiliate of the Sponsor for office space and/or support services for a total of
      $25,000 per month; reimbursement for any reasonable out-of-pocket expenses related to identifying, investigating and consummating an initial Business Combination, and repayment of loans, if any, and on such terms as to be determined by the Company
      from time to time, made by the Sponsor or certain of the Insiders to finance transaction costs in connection with an intended initial Business Combination, provided, that, if the Company does not consummate an initial Business Combination, a portion
      of the working capital held outside the Trust Account may be used by the Company to repay such loaned amounts so long as no proceeds from the Trust Account are used for such repayment. Up to $1,500,000 of such loans may be convertible into warrants
      of the post Business Combination entity at a price of $1.00 per warrant at the option of the lender. Such warrants would be identical to the Private Placement Warrants.

    

    

    10.          The Sponsor and each Insider has full right and power, without violating any agreement to which it is bound (including, without limitation, any non-competition or non-solicitation
      agreement with any employer or former employer), to enter into this Letter Agreement and, as applicable, to serve as an officer and/or a director on the board of directors of the Company and hereby consents to being named in the Prospectus as an
      officer and/or a director of the Company.

    

    

    
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    11.          As used herein, (i) “Business Combination” shall mean a merger, capital stock exchange, asset acquisition, stock purchase, reorganization or similar business combination, involving
      the Company and one or more businesses; (ii) “Capital Stock” shall mean, collectively, the Common Stock and the Founder Shares; (iii) “Founder Shares” shall mean the 3,306,250 shares of the Company’s Class B common stock, par value
      $0.0001 per share, (or 2,875,000 shares if the over-allotment option is not exercised by the Representative) initially held by the Sponsor; (iv) “Initial Stockholders” shall mean the Sponsor and any other holder of Founder Shares immediately
      prior to the Public Offering; (v) “Private Placement Warrants” shall mean the warrants to purchase up to 3,800,000 shares of Common Stock of the Company (or 4,145,000 shares of Common Stock if the over-allotment option is exercised in full)
      that the Sponsor has agreed to purchase for an aggregate purchase price of $3,800,000 in the aggregate (or $4,145,000 if the over-allotment option is exercised in full), or $1.00 per warrant, in a private placement that shall occur simultaneously
      with the consummation of the Public Offering; (vi) “Public Stockholders” shall mean the holders of securities issued in the Public Offering; (vii) “Trust Account” shall mean the trust fund into which a portion of the net proceeds of the
      Public Offering and the sale of the Private Placement Warrants shall be deposited; and (viii) “Transfer” shall mean the (a) sale or assignment of, offer to sell, contract or agreement to sell, hypothecate, pledge, grant of any option to
      purchase or otherwise dispose of or agreement to dispose of, directly or indirectly, or establishment or increase of a put equivalent position or liquidation with respect to or decrease of a call equivalent position within the meaning of Section 16
      of the Exchange Act and the rules and regulations of the Commission promulgated thereunder with respect to, any security, (b) entry into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of
      ownership of any security, whether any such transaction is to be settled by delivery of such securities, in cash or otherwise, or (c) public announcement of any intention to effect any transaction specified in clause (a) or (b).

    

    

    12.          This Letter Agreement constitutes the entire agreement and understanding of the parties hereto in respect of the subject matter hereof and supersedes all prior understandings, agreements,
      or representations by or among the parties hereto, written or oral, to the extent they relate in any way to the subject matter hereof or the transactions contemplated hereby.  This Letter Agreement may not be changed, amended, modified or waived
      (other than to correct a typographical error) as to any particular provision, except by a written instrument executed by all parties hereto.

    

    

    13.          Except as otherwise provided herein, 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 parties.  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
      Sponsor and each Insider and their respective successors, heirs and assigns and permitted transferees.

    

    

    14.          Nothing in this Letter Agreement shall be construed to confer upon, or give to, any person or entity other than the parties hereto any right, remedy or claim under or by reason of this
      Letter Agreement or of any covenant, condition, stipulation, promise or agreement hereof.  All covenants, conditions, stipulations, promises and agreements contained in this Letter Agreement shall be for the sole and exclusive benefit of the parties
      hereto and their successors, heirs, personal representatives and assigns and permitted transferees.

    

    

    
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    15.          This Letter Agreement may be executed in any number of original or facsimile counterparts and each of such counterparts shall for all purposes be deemed to be an original, and all such
      counterparts shall together constitute but one and the same instrument.

    

    

    16.          This Letter 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 Letter
      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 Letter Agreement a provision as similar in terms
      to such invalid or unenforceable provision as may be possible and be valid and enforceable.

    

    

    17.          This Letter 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.  The parties hereto (i) all agree that any action, proceeding, claim or dispute arising out of, or relating in any way to, this Letter Agreement shall be brought and enforced
      in the courts of New York City, in the State of New York, and irrevocably submit to such jurisdiction and venue, which jurisdiction and venue shall be exclusive and (ii) waive any objection to such exclusive jurisdiction and venue or that such courts
      represent an inconvenient forum.

    

    

    18.          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.

    

    

    19.          This Letter Agreement shall terminate on the earlier of (i) the expiration of the Lock-up Periods or (ii) the liquidation of the Company; provided, however, that this
      Letter Agreement shall earlier terminate in the event that the Public Offering is not consummated and closed by December 31, 2020; provided further that paragraph 4 of this Letter Agreement shall survive such liquidation for a period
      of six years.

    

    

    

    

    

    

    [Signature Page Follows]

    

    

    
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      	 	Sincerely,

            	 
	 	 	 
	 	NORTH MOUNTAIN MERGER CORP.

              	 
	 	 	 	 
	

            	
              By: 

            	

            	 
	 	 	Name:	
              Charles B. Bernicker

            	 
	 	 	Title:	
              Chief Executive Officer

            	 
	 	 	 	 


    

    

    

     

    

    

     

      

    [Signature Page to Letter
        Agreement]

    

    
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                Acknowledged and Agreed:

              

            	 
	
               

            	
               

            	
               

            	
               

            	
               

            	 
	
              
                AGREED TO AND ACCEPTED BY:

              

            	 
	
               

            	
               

            	
               

            	
               

            	
               

            	 
	
              
                NORTH MOUNTAIN LLC

              

            	 
	
               

            	
               

            	
               

            	
               

            	
               

            	 
	
               

            	
               By:

            	
               Harbour Reach Holdings LLC, its managing member

            
	
               

            	
               

            	
               

            	
               

            	
               

            	 
	
               

            	
               

            	
               By:

            	
               Netherton Investments Limited, its managing member

            
	
               

            	
               

            	
               

            	
               

            	
               

            	 
	
               

            	
               

            	
               

            	
               By:

            	
               

            	 
	
               

            	
               

            	
               

            	
               Name:

            	
               Robert Heaselgrave

            	 
	
               

            	
               

            	
               

            	
               Title:

            	
               Director

            	 
	
               

            	
               

            	
               

            	
               

            	
               

            	 


    

    

      

    DIRECTORS AND MANAGEMENT TEAM OF NORTH MOUNTAIN MERGER CORP.

    

    

              

    

    
      	
               

            	
               

            
	
               Charles B. Bernicker

            	
               

            
	
               Chief Executive Officer

            	
               

            
	
               

            	
               

            
	
               

            	
               

            
	
               

            	
               

            
	
              
                 Nicholas Dermatas

              

            	
               

            
	
              
                 Chief Financial Officer and Secretary

              

            	
               

            
	

            	
               

            
	

            	
               

            
	
               

            	
               

            
	
              
                 Robert L. Metzger

              

            	
               

            
	 Director	
               

            
	
              
                 

              

            	
               

            
	
               

            	
               

            
	
               

            	
               

            
	
               Scott O’Callaghan

            	
               

            
	
               Director

            	
               

            
	
               

            	
               

            
	
               

            	
               

            
	 	 
	
               Douglas J. Pauls

            	
               

            
	
               Director

            	
               

            


    

    

    

    

    

    
      [Signature Page to
          Letter Agreement]