Document:

EX-4.2

 Exhibit 4.2 

SPECIMEN SERIES A COMMON STOCK CERTIFICATE 
  

			
	NUMBER	  	NUMBER
		  	C-1
		  	SHARES
		  	SEE REVERSE FOR CERTAIN DEFINITIONS
		  	CUSIP [         ]

 ATLANTIC COASTAL ACQUISITION CORP. II 

INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE 

SERIES A COMMON STOCK 
 This Certifies that
is the owner of 
 FULLY PAID AND NON-ASSESSABLE SHARES OF THE PAR VALUE OF $0.0001 EACH OF THE SERIES A COMMON STOCK
OF 
 ATLANTIC COASTAL ACQUISITION CORP. II 

(THE “COMPANY”) 
 transferable on
the books of the Company in person or by duly authorized attorney upon surrender of this certificate properly endorsed. 
 The Company will be forced to
redeem all of its shares of Series A common stock if it does not complete a business combination by [                 ],
20[        ], all as more fully described in the Company’s final prospectus dated [                ],
20[        ]. 
 This certificate is not valid unless countersigned by the Transfer Agent and registered by the
Registrar. 
 Witness the seal of the Company and the facsimile signatures of its duly authorized officers. 

 

	
	Chief Executive Officer
	  

 ATLANTIC COASTAL ACQUISITION CORP. II 

The Company will furnish without charge to each stockholder who so requests the powers, designations, preferences and relative, participating, optional or
other special rights of each class of stock or series thereof of the Company and the qualifications, limitations, or restrictions of such preferences and/or rights. This certificate and the shares represented thereby are issued and shall be held
subject to all the provisions of the Company’s amended and restated certificate of incorporation and all amendments thereto and resolutions of the Company’s Board of Directors providing for the issue of securities (copies of which may be
obtained from the secretary of the Company), to all of which the holder of this certificate by acceptance hereof assents. The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they
were written out in full according to applicable laws or regulations: 
  

															
	TEN COM	 	-	  	as tenants in common	  	UNIF GIFT MIN ACT	 	-	  	  
	 	Custodian	  	  

	TEN ENT	 	-	  	as tenants by the entireties	  		 		  	(Cust)	 		  	(Minor)
	JT TEN	 	-	  	as joint tenants with right of survivorship and not as tenants in common	  		 		  	under Uniform Gifts to Minors Act (State)

 Additional abbreviations may also be used though not in the above list. 

For value received, hereby sells, assigns and transfers unto 

(PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER(S) OF ASSIGNEE(S)) 

(PLEASE PRINT OR TYPEWRITE NAME(S) AND ADDRESS(ES), INCLUDING ZIP CODE, OF ASSIGNEE(S)) 

shares of the Series A common stock represented by the within Certificate, and hereby irrevocably constitutes and appoints 

Attorney to transfer the said stock on the books of the within named Company with full power of substitution in the premises. 

 

	
	 Dated:

	  

 NOTICE: THE SIGNATURE(S) TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY
PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER. 
  

	
	 Signature(s) Guaranteed:

	 By

 THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND
LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15 (OR ANY SUCCESSOR RULE UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED). 
 In each case, as more fully described in the Company’s final prospectus dated
[                ], 20[        ], the holder(s) of this certificate shall be entitled to receive a
pro-rata portion of certain funds held in the trust account established in connection with its initial public offering only in the event that (i) the Company redeems the shares of Series A common stock
sold in the Company’s initial public offering and liquidates because it does not consummate an initial business combination by [                ],
20[        ], (ii) the Company redeems the shares of Series A common stock sold in its initial public offering in connection with a stockholder vote to amend the Company’s amended and restated certificate
of incorporation (a) to modify the substance or timing of the Company’s obligation to allow redemption in connection with its initial business combination or to redeem 100% of the Series A common stock if it does not consummate an initial
business combination by [                ], 20[        ] or (b) with respect to any other provisions relating to
stockholders’ rights or pre-initial business combination activity, or (iii) if the holder(s) seek(s) to redeem for cash his, her or its respective shares of Series A common stock in connection with a
tender offer (or proxy solicitation, solely in the event the Company seeks stockholder approval of the proposed initial business combination) setting forth the details of a proposed initial business combination. In no other circumstances shall the
holder(s) have any right or interest of any kind in or to the trust account.EX-10.1

 Exhibit 10.1 

[                ], 20[    ] 

Atlantic Coastal Acquisition Corp. II 
 6 St Johns Lane, Floor 5

 New York, New York 10013 
 Cantor Fitzgerald & Co. 

499 Park Avenue 
 New York, New York 10022 

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”) entered into by and among Atlantic Coastal Acquisition Corp. II, a Delaware corporation (the “Company”), and Cantor Fitzgerald & Co., as sole underwriter (the
“Underwriter”), relating to an underwritten initial public offering (the “Public Offering”), of 25,000,000 of the Company’s units (including up to 3,750,000 units that may be purchased to cover
over-allotments, if any) (the “Units”), each comprised of one share of the Company’s Series 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 a 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 Global Market. 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, each of Atlantic Coastal Acquisition Management II LLC, a Delaware limited liability company (the “Sponsor”), and the
undersigned individuals, each of whom is a member of the Company’s board of directors and/or a member of the Company’s management team, or a nominee for membership on the board of directors (each, an “Insider” and
collectively, the “Insiders”), 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 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 engages in a tender offer in connection with any proposed Business Combination, each Insider agrees that it, he or she will not seek to sell its, his or her shares of Common Stock to the Company in connection with such tender offer.

  

	2.	 The Sponsor and each Insider hereby agrees that in the event that the Company fails to consummate a Business
Combination within 18 months from the closing of the Public 

	 	
Offering, 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 (as defined below), 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 (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 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 each Insider agrees not to propose any amendment to the amended and restated certificate of incorporation (the “Charter”) to modify the substance or timing of the ability of holders of Offering
Shares to seek redemption in connection with a Business Combination or the Company’s obligation to redeem 100% of the Offering Shares if the Company does not complete a Business Combination by the date set forth in the Charter, unless the
Company provides Public Stockholders with the opportunity to redeem their shares of Common Stock 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 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 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, him or her. The Sponsor and each Insider hereby further waives, 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 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 has not consummated a Business Combination within the time period set forth in the Charter 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).     

  

	3.	 The undersigned acknowledges and agrees that prior to entering into a definitive agreement for a Business
Combination with a target business that is affiliated with the undersigned or any other Insiders of the Company or their affiliates, such transaction must be approved by a majority of the Company’s disinterested independent directors and

  
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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. 

  

	4.	 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 Representatives, (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 Common Stock, Founder Shares, 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 Common Stock,
Founder Shares, 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 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.	 In the event of the liquidation of the Trust Account upon the failure of the Company to consummate its initial
Business Combination within the time period set forth in the Charter, the Sponsor (the “Indemnitor”), which for purposes of clarification shall not extend to any other shareholders, members or managers of the Sponsor, or any
of the other undersigned, 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) 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 written letter of intent, confidentiality or other similar agreement or Business Combination agreement (a “Target”); provided,
however, that such indemnification of the Company by the Indemnitor shall (x) apply only to the extent necessary to ensure that such claims by a third party for services rendered (other than the Company’s independent public
accountants) or products sold to the Company or a Target 

  
 3 

	 	
do not reduce the amount of funds in the Trust Account to below the lesser of (i) $10.20 per Offering Share and (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 $10.20 per Offering Share is then held in the Trust Account due to reductions in the value of the trust assets, less interest earned on the funds in the Trust Account which may be withdrawn
to pay franchise and income taxes, (y) shall not apply to any claims by a third party or a Target which 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 Underwriters against certain liabilities, including liabilities under the Securities Act of 1933, as amended. In the event that any such executed waiver is deemed to be
unenforceable against such third party, the Sponsor shall not be responsible to the extent of any liability for such third party claims. The Indemnitor 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 Indemnitor, the Indemnitor notifies the Company in writing that it shall undertake such defense. 

 

	6.	 To the extent that the Underwriters do not exercise their over-allotment option to purchase up to an additional
3,750,000 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 937,500 multiplied by a fraction,
(i) the numerator of which is 3,750,000 minus the number of Units purchased by the Underwriters upon the exercise of their over-allotment option, and (ii) the denominator of which is 3,750,000. The forfeiture will be adjusted to the extent
that the over-allotment option is not exercised in full by the Underwriters 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.

  

	7.	 The Sponsor and each Insider 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 an Insider of its, his or her obligations under paragraphs 1, 2, 3, 4, 5, 6, 8(a), 8(b) and 10, 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. 

  

	8.	 (a)    The Sponsor and each Insider agrees that it, he or she 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 last sale 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”). 

  
 4 

 (b) The Sponsor and each Insider agrees 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 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, any Insider or any of their permitted transferees (that have complied with this paragraph
8(c)), are permitted (a) to any persons (including their affiliates and members) participating in the private placement of the Private Placement Warrants; (b) to the Company’s founders, or to the Company’s officers, directors and
employees; (c) in the case of an entity, as a distribution to its, partners, stockholders or members upon its liquidation; (d) by bona fide gift to a member of the holder’s immediate family or to a trust, the beneficiary of which is a
member of the holder’s immediate family, for estate planning purposes; (e) by virtue of the laws of descent and distribution upon death; (f) pursuant to a qualified domestic relations order; (g) by certain pledges to secure
obligations incurred in connection with purchases of the Company’s securities; (h) by private sales or transfers at prices no greater than the price at which the securities were originally purchased; or (i) to the Company for no value
for cancellation in connection with the completion of the initial Business Combination; provided, that, in the case of clauses (a) through (h), any such transferees enter into a written agreement with the Company agreeing to be bound by
the transfer restrictions in this Letter Agreement. 
  

	9.	 Each of the Insiders agrees to be a director or officer of the Company, as applicable, until the earlier of the
consummation by the Company of an initial Business Combination, the liquidation of the Company, or his or her removal, death or incapacity. The Sponsor and each Insider represents and warrants 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 material respects and does not omit any material information with respect to the Insider’s background and contains all of the information required to be disclosed pursuant
to Item 401 of Regulation S-K, promulgated under the Securities Act. Each Insider’s questionnaire furnished to the Company and the Representative is true and accurate in all material respects. 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. 

  
 5 

	10.	 Except as disclosed in the Prospectus, neither the Sponsor nor any Insider, nor any affiliate of the Sponsor or
any Insider, 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 $250,000 made to the Company by the Sponsor; 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 $1.50 per warrant at the option of the lender. Such warrants would be identical to the Private Placement Warrants. 

 

	11.	 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 director on the board of directors of the Company and hereby consents to being named in the Prospectus as an officer and/or director 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 (a) the 7,187,500 shares of the Company’s Series B common stock, par value $0.0001 per share, initially issued to the Sponsor (up to 937,500 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 up to 7,900,000 shares of Common Stock of the Company (or 8,900,000 if the over-allotment option is exercised in full), that the Sponsor has agreed to purchase for an aggregate
purchase price of $11,850,000 (or $13,350,000 if the over-allotment option is exercised in full), or $1.50 per Warrant, in a private placement that shall occur simultaneously with the

  
 6 

	 	
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 account into which the net proceeds of the Public Offering and certain 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 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).     

  

	13.	 Subject to the terms and conditions of this paragraph 13, if, in connection with or prior to the closing of the
initial Business Combination, the Company proposes to raise additional capital by issuing any equity securities, or securities convertible into, exchangeable or exercisable for equity securities other than Excluded Securities (as defined below)
(such securities, “New Equity Securities”), the Company shall first make an offer of the New Equity Securities to the Sponsor in accordance with the following provisions of this paragraph 13 (the “Right of First
Offer”): 

 (a) Offer Notice. 

(i) The Company shall give written notice (the “Offering Notice”) to the Sponsor stating its bona fide
intention to offer the New Equity Securities and specifying the number of New Equity Securities and the material terms and conditions, including the price, pursuant to which the Company proposes to offer the New Equity Securities. 

(ii) The Offering Notice shall constitute the Company’s offer to sell the New Equity Securities to the Sponsor, which
offer shall be irrevocable for a period of three (3) business days (the “ROFO Notice Period”). 
 (b)
Exercise of Right of First Offer. 
 (i) Upon receipt of the Offering Notice, the Sponsor shall have until the end of
the ROFO Notice Period to offer to purchase any or all of the New Equity Securities by delivering a written notice (a “ROFO Offer Notice”) to the Company stating that it offers to purchase such New Equity Securities on the
terms specified in the Offering Notice. Any ROFO Offer Notice so delivered shall be binding upon delivery and irrevocable by the Sponsor. 

(ii) If the Sponsor does not deliver a ROFO Offer Notice during the ROFO Notice Period or indicates, in its ROFO Offer Notice
its offer to purchase some but not all of the New Equity Securities, the Sponsor shall be deemed to have waived all of the Sponsor’s rights to purchase such number of New Equity Securities that it declined to

  
 7 

 
purchase, and the Company shall thereafter be free to sell or enter into an agreement to sell such number of New Equity Securities to any third party without any further obligation to the Sponsor
pursuant to this paragraph 13 within the forty-five (45) day period thereafter (and with respect to an agreement to sell, consummate such sale at any time thereafter) at a price not more favorable to the third party than those set forth in the
Offering Notice. If the Company does not sell or enter into an agreement to sell such number of New Equity Securities within such period, the rights provided hereunder shall be deemed to be revived and such New Equity Securities shall not be offered
to any third party unless first re-offered to the Sponsor in accordance with this paragraph 13. 

(c) Excluded Securities. For purposes hereof, the term “Excluded Securities” means any warrants issued upon the
conversion of working capital loans to the Company to be made by the Sponsor or an affiliate thereof to finance transaction costs in connection with an intended initial Business Combination (up to $1,500,000 of which may be convertible at the option
of the lender into warrants of the post-Business Combination entity having the same terms as the Private Placement Warrants at a price of $1.50 per warrant), and any securities issued by the Company as consideration to any seller in the Business
Combination or in satisfaction for any amounts owed by or claims against the Company. 
 (d) Assignment of Right of First Offer. The
Right of First Offer may be assigned in whole or in part by the Sponsor to any of its members without the prior consent of the Company. Following any such assignment, the Company and any such assignee shall comply with the provisions set forth in
this paragraph 13 with respect to the Right of First Offer as if such assignee were a party hereto. 
  

	14.	 The Company will maintain an insurance policy or policies providing directors’ and officers’
liability insurance, and each Director 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 of the Company’s directors or officers. 

 

	15.	 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. 

 

	16.	 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. 

  

	17.	 Nothing in this Letter Agreement shall be construed to confer upon, or give to, any person or corporation other
than the parties hereto any right, remedy or claim under or by 

  
 8 

	 	
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. 

 

	18.	 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. 

  

	19.	 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. 

 

	20.	 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. 

  

	21.	 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. 

 

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

[Signature Page Follows] 

  
 9 

 
			
	Sincerely,
	
	ATLANTIC COASTAL ACQUISITION MANAGEMENT II LLC
		
	 By:
	 	  

		 	 Name: Shahraab Ahmad

		 	 Title:   Authorized Signatory

		
		 	      

Name of Insider: Shahraab Ahmad

		
		 	      

Name of Insider: Anthony D. Eisenberg

		
		 	      

Name of Insider: Jason Chryssicas

		
		 	      

Name of Insider: Burt Jordan 

		
		 	      

Name of Insider: Joanna Lord

		
		 	      

Name of Insider: Bryan Dove

		
		 	      

Name of Insider: Iqbaljit Kahlon

		
		 	      

Name of Insider: Darren Stanwood

		
		 	      

Name of Insider: Dominick J. Schiano

  

[Signature Page to Letter Agreement] 

 Acknowledged and Agreed: 
  

					
	 ATLANTIC COASTAL ACQUISITION CORP. II

		
	 By:
	 	  

		 	Name:	 	Shahraab Ahmad
		 	 Title:
	 	 Chief Executive Officer

  
 [Signature Page
to Letter Agreement]

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