EX-10.6





 Exhibit 10.6 

Execution Version 

November 3, 2021 
 Juniper II Corp. 

3790 El Camino Real #818 
 Palo Alto, California 94306 

Morgan Stanley 
 1585 Broadway, 36th Floor 

New York, NY 10036 
 UBS Securities LLC 

1285 Avenue of the Americas 
 New York, NY 10019 

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 between Juniper II Corp., a Delaware corporation (the “Company”), Morgan Stanley and UBS Securities LLC (the “Underwriters”),
relating to an underwritten initial public offering (the “Public Offering”), of 26,000,000 of the Company’s units (including up to 3,900,000 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
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 a prospectus (the “Prospectus”) included therein, filed by the Company with the Securities and Exchange Commission (the
“Commission”) and the Company has applied to have the Units listed on the New York Stock Exchange. Certain capitalized terms used herein are defined in paragraph 12 hereof. 

In order to induce the Company and the Underwriters 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, Juniper II Management, LLC, a Delaware limited liability company (the “Sponsor”), and the undersigned individual, an advisor
of the Company (the “Advisor”), hereby agrees with the Company as follows: 
 1. It is acknowledged and agreed that
the Company shall not enter into a definitive agreement regarding a proposed Business Combination without the prior consent of the Sponsor. The Sponsor and the Advisor agree that if the Company seeks stockholder approval of a proposed Business
Combination, then in connection with such proposed Business Combination, it or he shall (i) vote any shares of Capital Stock owned by it or him in favor of any proposed Business Combination and (ii) not redeem any shares of Common Stock
owned by it or him 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 the Advisor agree that it or he will not sell or tender any shares of
Common Stock owned by it or him in connection therewith. 












 2. The Sponsor hereby agrees that in the event that the Company fails to consummate a
Business Combination within 18 months (or up to 24 months if the Company extends the period of time to consummate a Business Combination, in accordance with the Company’s amended and restated certificate of incorporation) 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 Sponsor 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 earned on the funds held in the Trust Account and not previously released to the Company to pay franchise and income taxes (less up to $100,000 of such net 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 liquidation 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 the Advisor agree to not propose any amendment to the Company’s amended and restated certificate of incorporation that would affect 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 Company’s amended and restated certificate of
incorporation or with respect to any other provisions relating to the rights of holders of our Common Stock, 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 earned on the funds held in the Trust Account and not previously released to the
Company to pay its franchise and income taxes, divided by the number of then outstanding Offering Shares. 
 The Sponsor and the Advisor
acknowledges that it or he has no right, title, interest or claim of any kind in or to any monies held in the Trust Account or any other asset of the Company as a result of any liquidation of the Company with respect to the Founder Shares held by
it. The Sponsor and the Advisor hereby further waive, with respect to any shares of Common Stock held by it or him, if any, any redemption rights it or he 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 Advisor and their
respective affiliates shall be entitled to redemption and liquidation rights with respect to any shares of Common Stock it or they hold if the Company fails to consummate a Business Combination within the time period set forth in the Company’s
amended and restated certificate of incorporation. 
 3. The undersigned acknowledges that prior to entering into a definitive agreement for
a Business Combination with a target business that is affiliated with any member of the Company’s board of directors, a nominee for membership on the board of directors and/or an executive officer of the Company (each, an
“Insider”) or their affiliates, 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,
which is a member of the Financial Industry Regulatory Authority, or an independent accounting firm that such Business Combination is fair to the Company’s unaffiliated stockholders from a financial point of view. 

  
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 4. During the period commencing on the effective date of the Underwriting Agreement and
ending 180 days after such date, the Sponsor and the Advisor shall not, without the prior written consent of the Underwriters, Transfer any Units, shares of Common Stock, Founder Shares, Warrants or any securities convertible into, or exercisable,
or exchangeable for, shares of Common Stock owned by it or him. Each of the Advisor 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 4 or paragraph 8
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 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 the release or waiver is effected solely to permit a transfer not for consideration and 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. 

5. [Reserved]. 
 6. [Reserved].

 7. The Sponsor and the Advisor hereby agrees and acknowledges that: (i) the Underwriters and the Company would be irreparably injured
in the event of a breach by such Sponsor or Advisor of its or his obligations under paragraphs 1, 2, 3, 4, 7, 8(a), 8(b), and 10, as applicable, of this Letter Agreement (it being acknowledged and agreed that the Advisor has no obligations under
paragraph 3 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. 
 8. (a) The Sponsor and the Advisor 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 the Advisor agree that it or he 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”). 

  
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 (c) Notwithstanding the provisions set forth in paragraphs 8(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, the Advisor or any of their permitted
transferees (that have complied with this paragraph 8(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
affiliate of the members of the Sponsor, any affiliates of the Sponsor, or any employees of such affiliates; (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) to the Company for no value for cancellation in connection with the consummation of an initial Business Combination or pursuant to paragraph
6 herein; and (i) in the event of the Company’s liquidation, merger, capital stock exchange, reorganization or other similar transaction which results in all of the Company’s stockholders having the right to exchange their shares of
Common Stock for cash, securities or other property subsequent to the completion of the Company’s initial Business Combination; provided, however, that in the case of clauses (a) through (e) these permitted transferees must enter into a
written agreement agreeing to be bound by the restrictions herein. 
 9. The Advisor’s biographical information furnished to the Company
(including any such information included in the Prospectus) is true and accurate in all material respects. 
 10. Except as disclosed in the
Prospectus, neither the Sponsor nor the Advisor nor any affiliate of the Sponsor or the Advisor, 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 up to an aggregate of $300,000 made to the Company by the
Sponsor; payment to an affiliate of the Sponsor for office space, utilities and secretarial and administrative support for a total of $10,000 per month; interest earned on the funds held in the trust account may be released to the Company to pay its
franchise and income tax obligations; 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 any of the Company’s officers or directors 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 at a price of $1.00 per whole warrant at the option of the lender. Such warrants would be identical to the Private Placement
Warrants, including as to exercise price, exercisability and exercise period. 

  
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 11. The Sponsor and the Advisor 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 advisor of the Company and hereby consents to being named in the Prospectus as an advisor of the Company. 

12. 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 7,475,000 shares of the Company’s Class B common stock, par value $0.0001 per share, issued and outstanding immediately prior to the consummation of the Public Offering (up to 975,000 shares of which are
subject to complete or partial forfeiture by the Sponsor if the over-allotment option is not exercised by the Underwriters); (iv) “Initial Stockholders” shall mean the Sponsor and any Insider that holds Founder Shares; (v)
“Private Placement Warrants” shall mean the Warrants to purchase 13,400,000 shares of Common Stock of the Company (or 14,960,000 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 $13,400,000 (or $14,960,000 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 certain of the proceeds from the sale of the Private Placement Warrants shall be deposited; and (viii) “Transfer” shall mean the (a) sale 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 Securities Exchange Act of 1934, as amended, 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). 
 13. This Letter Agreement (together with, solely with
respect to the Sponsor, any other letter agreements entered into by the Sponsor in respect of the subject matter hereof) 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. 

14. 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 Sponsor and the Advisor and their respective successors, heirs and assigns and permitted transferees. 

  
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 15. 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. 

16. 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. 

17. 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 further that paragraph 5 of this Letter Agreement shall survive such liquidation. 

[Signature Page Follows] 

  
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	Sincerely,
	
	JUNIPER II MANAGEMENT, LLC
			
	    	 	By:	 	 /s/ Roger Fradin

		 		 	Name: Roger Fradin
		 		 	Title: Manager


  

			
	By:	 	 /s/ Darius Adamczyk

		 	Darius Adamczyk


  

			
	Acknowledged and Agreed:
	
	JUNIPER II CORP.
		
	By:	 	 /s/ Noah Kindler

	Name:	 	Noah Kindler
	Title:	 	Chief Financial Officer and Chief Technology Officer

  

  
 [Signature Page to
Letter Agreement]