Document:

EX-4.6

 Exhibit 4.6 

FORM OF PRIVATE WARRANT AGREEMENT 

between 
 ATLANTIC COASTAL
ACQUISITION CORP. II 
 and 

CONTINENTAL STOCK TRANSFER & TRUST COMPANY 

Dated as of [ ], 20[_] 
 THIS
PRIVATE WARRANT AGREEMENT (as amended, supplemented or otherwise modified from time to time, this “Agreement”), dated as of [ ], 20[_], is by and between Atlantic Coastal Acquisition Corp. II, a Delaware corporation (the
“Company”), and Continental Stock Transfer & Trust Company, a New York limited purpose trust company, as warrant agent (the “Warrant Agent,” also referred to herein as the “Transfer Agent”). 

WHEREAS, the Company is engaged in an initial public offering (the “Offering”) of units of the Company’s equity
securities, each such unit comprised of one share of Series A common stock of the Company, par value $0.0001 per share (“Common Stock”), and one-half of one public warrant (the
“Units”) and, in connection therewith, has determined to issue and deliver up to 12,500,000 warrants (or up to 14,375,000 warrants if the over-allotment option is exercised in full) to public investors in the Offering (the
“Public Warrants”); 
 WHEREAS, on [__], 20[__], the Company entered into that certain Private Placement Warrant Purchase
Agreement with Atlantic Coastal Acquisition Management II LLC, a Delaware limited liability company (the “Sponsor”), pursuant to which the Sponsor agreed to purchase an aggregate of 7,900,000 warrants (or 8,900,000 warrants if the
over-allotment option is exercised in full) (the “Private Placement Warrants”) simultaneously with the closing of the Offering (and the closing of the over-allotment option, if applicable), at a purchase price of $1.50 per Private
Placement Warrant; 
 WHEREAS, in order to finance the Company’s transaction costs in connection with an intended initial Business
Combination (as defined below), the Sponsor or affiliates of the Sponsor or certain of the Company’s officers and directors may, but are not obligated to, loan the Company funds as the Company may require, of which up to $1,500,000 of such
loans may be convertible into up to an additional 1,000,000 warrants at a price of $1.50 per warrant (the “Working Capital Warrants” and, together with the Private Placement Warrants, the “Warrants”); 

WHEREAS, the Company has filed with the U.S. Securities and Exchange Commission (the “Commission”) a registration statement on Form S-1, File No. 333-[__] (the “Registration Statement”) and a prospectus (the “Prospectus”), for the registration, under the Securities Act of 1933, as amended (the “Securities
Act”), of the issuance of the Units, the Public Warrants and the shares of Common Stock included in the Units; 

 WHEREAS, the Company desires the Warrant Agent to act on behalf of the Company, and the
Warrant Agent is willing to so act, in connection with the issuance, registration, transfer, exchange and exercise of the Warrants; 

WHEREAS, the Company desires to provide for the form and provisions of the Warrants, the terms upon which they shall be issued and exercised,
and the respective rights, limitation of rights, and immunities of the Company, the Warrant Agent, and the holders of the Warrants; and 

WHEREAS, all acts and things have been done and performed which are necessary to make the Warrants, when executed on behalf of the Company and
countersigned by or on behalf of the Warrant Agent (if a physical certificate is issued), as provided herein, the valid, binding and legal obligations of the Company, and to authorize the execution and delivery of this Agreement. 

NOW, THEREFORE, in consideration of the mutual agreements herein contained, the parties hereto agree as follows: 

1. Appointment of Warrant Agent. The Company hereby appoints the Warrant Agent to act as agent for the Company for the Warrants, and the
Warrant Agent hereby accepts such appointment and agrees to perform the same in accordance with the express terms and conditions set forth in this Agreement. 

2. Warrants. 
 2.1. Form
of Warrant. Each Warrant shall initially be issued in registered form only. 
 2.2. Effect of Countersignature. If a physical
certificate is issued, unless and until countersigned by the Warrant Agent pursuant to this Agreement, a certificated Warrant shall be invalid and of no effect and may not be exercised by the holder thereof. 

2.3. Registration. 

2.3.1. Warrant Register. The Warrant Agent shall maintain books (the “Warrant Register”) for the registration of the
initial issuance of the Warrants and the registration of transfer of the Warrants. Upon the initial issuance of the Warrants in book-entry form, the Warrant Agent shall issue and register the Warrants in the names of the respective holders thereof
in such denominations and otherwise in accordance with instructions delivered to the Warrant Agent by the Company. If requested, the Registered Holder (as defined below) shall be issued a definitive certificate in physical form evidencing such
Warrants which shall be in the form attached hereto as Exhibit B (the “Definitive Warrant Certificate”). 
 Physical
certificates, if issued, shall be signed by, or bear the facsimile signature of, the Chairman of the board of directors of the Company (the “Board”), Chief Executive Officer, Chief Financial Officer, the President or the Secretary
or other principal officer of the Company. In the event the person whose facsimile signature has been placed upon any Warrant shall have ceased to serve in the capacity in which such person signed the Warrant before such Warrant is issued, it may be
issued with the same effect as if he or she had not ceased to be such at the date of issuance. 

 2.3.2. Registered Holder. Prior to due presentment for registration of transfer of
any Warrant, the Company and the Warrant Agent may deem and treat the person in whose name such Warrant is registered in the Warrant Register (the “Registered Holder”) as the absolute owner of such Warrant and of each Warrant
represented thereby (notwithstanding any notation of ownership or other writing on any physical certificate made by anyone other than the Company or the Warrant Agent), for the purpose of any exercise thereof, and for all other purposes, and neither
the Company nor the Warrant Agent shall be affected by any notice to the contrary. 
 3. Terms and Exercise of Warrants. 

3.1. Warrant Price. Each whole Warrant, when countersigned by the Warrant Agent, shall entitle the Registered Holder thereof, subject to
the provisions of such Warrant and of this Agreement, to purchase from the Company the number of shares of Common Stock stated therein, at the price of $11.50 per share, subject to the adjustments provided in Section 4 hereof and in the
penultimate sentence of this Section 3.1. The term “Warrant Price”, as used in this Agreement shall mean the price per share at which each share of Common Stock may be purchased at the time a Warrant is
exercised. The Company in its sole discretion may lower the Warrant Price at any time prior to the Expiration Date (as defined below) for a period of not less than twenty (20) Business Days, provided, that the Company shall provide at
least twenty (20) days prior written notice of such reduction to Registered Holders of the Warrants and, provided, further, that any such reduction shall be identical among all of the Warrants. The term “Business
Day” means a day other than a Saturday, Sunday or federal holiday, on which banks in New York City are generally open for normal business. 

3.2. Duration of Warrants. A Warrant may be exercised only during the period (the “Exercise Period”) commencing on the
later of: (i) the date that is thirty (30) days after the first date on which the Company completes a merger, capital stock exchange, asset acquisition, stock purchase, reorganization or similar business combination, involving the Company
and one or more businesses (a “Business Combination”), or (ii) the date that is twelve (12) months from the date of the closing of the Offering and terminating at the earlier to occur of (x) 5:00 p.m., New York City time
on the date that is five (5) years after the date on which the Company completes its initial Business Combination and (y) the liquidation of the Company (the “Expiration Date”); provided, however, that the
exercise of any Warrant shall be subject to the satisfaction of any applicable conditions, as set forth in subsection 3.3.2 hereof, with respect to an effective registration statement. Each Warrant not exercised on or before the Expiration
Date shall become null and void, and all rights thereunder and all rights in respect thereof under this Agreement shall cease at 5:00 p.m., New York City time on the Expiration Date. The Company in its sole discretion may extend the duration of the
Warrants by delaying the Expiration Date; provided, however, that the Company shall provide at least twenty (20) days prior written notice of any such extension to Registered Holders of the Warrants and, provided,
further, that any such extension shall be identical in duration among all the Warrants and the Public Warrants. 

 3.3. Exercise of Warrants. 

3.3.1. Payment. Subject to the provisions of the Warrant and this Agreement, a Warrant, when countersigned by the Warrant Agent, may be
exercised by the Registered Holder thereof by delivering to the Warrant Agent at its corporate trust department (i) the Definitive Warrant Certificate evidencing the Warrants to be exercised, or in the case of a Warrant represented by a
book-entry, the Warrants to be exercised (the “Book-Entry Warrants”) on the records of The Depository Trust Company (the “Depository”), to an account of the Warrant Agent at the Depository designated for such
purposes in writing by the Warrant Agent to the Depository from time to time, (ii) an election to purchase (“Election to Purchase”) shares of Common Stock pursuant to the exercise of a Warrant, properly completed and executed
by the Registered Holder on the reverse of the Definitive Warrant Certificate or, in the case of a Book-Entry Warrant, properly delivered by the Participant in accordance with the Depository’s procedures, and (iii) the payment in full the
Warrant Price for each full share of Common Stock as to which the Warrant is exercised and any and all applicable taxes due in connection with the exercise of the Warrant, the exchange of the Warrant for the shares of Common Stock and the issuance
of such share of Common Stock, as follows: 
 (a) in lawful money of the United States, in good certified check or good bank
draft payable to the Warrant Agent or by wire transfer of immediately available funds; 
 (b) by surrendering the Warrants
for that number of shares of Common Stock equal to the quotient obtained by dividing (x) the product of the number of shares of Common Stock underlying the Warrants, multiplied by the difference between the “Sponsor Fair Market
Value”, as defined in this subsection 3.3.1(b), over the Warrant Price by (y) the Sponsor Fair Market Value. Solely for purposes of this subsection 3.3.1(b), the “Sponsor Fair Market Value” shall mean the average
last sale price of the Common Stock for the ten (10) trading days ending on the third trading day prior to the date on which notice of exercise of the Warrant is sent to Warrant Agent; or 

as provided in Section 6.4 hereof. 

3.3.2. Issuance of Shares of Common Stock on Exercise. As soon as practicable after the exercise of any Warrant and the clearance of
the funds in payment of the Warrant Price (if payment is pursuant to subsection 3.3.1(a) hereof), the Company shall issue to the Registered Holder of such Warrant a book-entry position or certificate, as applicable, for the number of full
shares of Common Stock to which he, she or it is entitled, registered in such name or names as may be directed by him, her or it, and if such Warrant shall not have been exercised in full, a new book-entry position or countersigned Warrant, as
applicable, for the number of shares of Common Stock as to which such Warrant shall not have been exercised. Notwithstanding the foregoing, the Company shall not be obligated to deliver any shares of Common Stock pursuant to the exercise of a
Warrant and shall have no obligation to settle such Warrant exercise unless a registration statement under the Securities Act with respect to the shares of Common Stock underlying the Warrants is then effective and a prospectus relating thereto is
current or a valid exemption from registration is available. No Warrant shall be exercisable and the Company shall not be obligated to issue shares of Common Stock upon exercise of a Warrant unless the shares of Common Stock issuable upon such
Warrant exercise have been registered, qualified or deemed to be exempt from registration or qualification under the securities laws of the state of residence of the Registered Holder of the Warrants. In the event that the conditions in the two
immediately preceding sentences are not satisfied with respect to a Warrant, the holder of such Warrant shall not be entitled to exercise such Warrant and such Warrant may have no value and expire worthless, in which case the purchaser of a Unit
containing such Warrants shall have paid the full purchase 

 
price for the Unit solely for the shares of Common Stock underlying such Unit. In no event will the Company be required to net cash settle the Warrant exercise. If, by reason of any exercise of
Warrants on a “cashless basis”, the holder of any Warrant would be entitled, upon the exercise of such Warrant, to receive a fractional interest in a share of Common Stock, the Company shall round down to the nearest whole number the
number of shares of Common Stock to be issued to such holder. Notwithstanding anything in this Agreement, for so long as any Warrant is held by the Sponsor or any Permitted Transferees (as defined below), such Warrant will not be exercisable more
than five (5) years from the effective date of the Registration Statement, in accordance with Financial Industry Regulatory Authority, Inc. (“FINRA”) Rules. In addition, no such Warrant will contain terms which allow the Sponsor or
any Permitted Transferees to receive or accrue cash dividends prior to the exercise of the Warrants. 
 3.3.3. Valid Issuance. All
shares of Common Stock issued upon the proper exercise of a Warrant in conformity with this Agreement shall be validly issued, fully paid and non-assessable. 

3.3.4. Date of Issuance. Each person in whose name any book-entry position or certificate, as applicable, for shares of Common Stock is
issued shall for all purposes be deemed to have become the holder of record of such shares of Common Stock on the date on which the Warrant, or book-entry position representing such Warrant, was surrendered and payment of the Warrant Price was made,
irrespective of the date of delivery of such certificate in the case of a certificated Warrant, except that, if the date of such surrender and payment is a date when the share transfer books of the Company or book-entry system of the Warrant Agent
are closed, such person shall be deemed to have become the holder of such shares of Common Stock at the close of business on the next succeeding date on which the share transfer books or book-entry system of the Warrant Agent are open. 

3.3.5. Maximum Percentage. A holder of a Warrant may notify the Company in writing in the event it elects to be subject to the
provisions contained in this subsection 3.3.5; however, no holder of a Warrant shall be subject to this subsection 3.3.5 unless he, she or it makes such election. If the election is made by a holder, the Warrant Agent shall not effect
the exercise of the holder’s Warrant, and such holder shall not have the right to exercise such Warrant, to the extent that after giving effect to such exercise, such person (together with such person’s affiliates), to the Warrant
Agent’s actual knowledge, would beneficially own in excess of 9.8%, or such other amount as a holder may specify (the “Maximum Percentage”) of the shares of Common Stock outstanding immediately after giving effect to such
exercise. For purposes of the foregoing sentence, the aggregate number of shares of Common Stock beneficially owned by such person and its affiliates shall include the number of shares of Common Stock issuable upon exercise of the Warrant with
respect to which the determination of such sentence is being made, but shall exclude shares of Common Stock that would be issuable upon (x) exercise of the remaining, unexercised portion of the Warrant beneficially owned by such person and its
affiliates and (y) exercise or conversion of the unexercised or unconverted portion of any other securities of the Company beneficially owned by such person and its affiliates (including, without limitation, any convertible notes or convertible
preferred stock or warrants) subject to a limitation on conversion or exercise analogous to the limitation contained herein. Except as set forth in the preceding sentence, for purposes of this paragraph, beneficial ownership shall be calculated in
accordance with Section 13(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). For 

 
purposes of the Warrant, in determining the number of issued and outstanding shares of Common Stock, the holder may rely on the number of issued and outstanding shares of Common Stock as
reflected in (1) the Company’s most recent annual report on Form 10-K, quarterly report on Form 10-Q, current report on Form
8-K or other public filing with the Commission as the case may be, (2) a more recent public announcement by the Company or (3) any other notice by the Company or the Transfer Agent setting forth the
number of shares of Common Stock issued and outstanding. For any reason at any time, upon the written request of the holder of the Warrant, the Company shall, within two (2) Business Days, confirm orally and in writing to such holder the number
of shares of Common Stock then outstanding. In any case, the number of issued and outstanding shares of Common Stock shall be determined after giving effect to the conversion or exercise of equity securities of the Company by the holder and its
affiliates since the date as of which such number of issued and outstanding shares of Common Stock was reported. By written notice to the Company, the holder of a Warrant may from time to time increase or decrease the Maximum Percentage applicable
to such holder to any other percentage specified in such notice; provided, however, that any such increase shall not be effective until the sixty-first (61st) day after such notice is delivered to the Company. 

3.3.6. Lock-up of Private Placement Warrants. The Warrants held by the Sponsor (or any
Permitted Transferees) and the shares of Common Stock that are issuable upon exercise of such Warrants have been deemed compensation by the FINRA and are therefore subject to a 180-day lock-up pursuant to FINRA Rule 5110(e)(1), commencing on the effective date of the Registration Statement. Pursuant to FINRA Rule 5110(e)(1), these securities will not be sold during the Offering, or sold,
transferred, assigned, pledged, or hypothecated, or be the subject of any hedging, short sale, derivative, put or call transaction that would result in the economic disposition of the securities by any person for a period of 180 days immediately
following the effective date of the Registration Statement or commencement of sales of the Offering, except to any underwriter and selected dealer participating in the Offering and their bona fide officers or partners (provided that all securities
so transferred remain subject to the lockup restriction above for the remainder of the time period) or pursuant to another exception to the applicability of FINRA Rule 5110(e)(1). 

4. Adjustments. 
 4.1.
Stock Dividends. 
 4.1.1. Stock Dividends and Split-Ups. If after the date hereof,
and subject to the provisions of Section 4.6 hereof, the number of issued and outstanding shares of Common Stock is increased by a stock dividend payable in shares of Common Stock, or by a
split-up of shares of Common Stock, or other similar event, then, on the effective date of such stock dividend, split-up or similar event, the number of shares of Common
Stock issuable on exercise of each Warrant shall be increased in proportion to such increase in the issued and outstanding shares of Common Stock. A rights offering to holders of shares of Common Stock entitling holders to purchase shares of Common
Stock at a price less than the “Fair Market Value” (as defined below) shall be deemed a stock dividend of a number of shares of Common Stock equal to the product of (i) the number of shares of Common Stock actually sold in such rights
offering (or issuable under any other equity securities sold in such rights offering that are convertible into or exercisable for the shares of Common Stock) multiplied by (ii) one (1) minus the quotient of (x) the price per

 
share of Common Stock paid in such rights offering divided by (y) the Fair Market Value. For purposes of this subsection 4.1.1, (i) if the rights offering is for securities
convertible into or exercisable for shares of Common Stock, in determining the price payable for the shares of Common Stock, there shall be taken into account any consideration received for such rights, as well as any additional amount payable upon
exercise or conversion and (ii) “Fair Market Value” means the volume weighted average price of the Common Stock as reported during the ten trading day period ending on the trading day prior to the first date on which the shares of
Common Stock trade on the applicable exchange or in the applicable market, regular way, without the right to receive such rights. Notwithstanding anything to the contrary herein, no shares of Common Stock shall be issued at less than their par
value. 
 4.1.2. Extraordinary Dividends. If the Company, at any time while the Warrants are outstanding and unexpired, shall pay a
dividend or make a distribution in cash, securities or other assets to the holders of the shares of Common Stock on account of such shares of Common Stock (or other shares of the Company’s share capital into which the Warrants are convertible),
other than (a) as described in subsection 4.1.1 above, (b) Ordinary Cash Dividends (as defined below), (c) to satisfy the redemption rights of the holders of the shares of Common Stock in connection with a proposed initial
Business Combination, (d) to satisfy the redemption rights of the holders of shares of Common Stock in connection with a stockholder vote to approve an amendment to the Company’s amended and restated certificate of incorporation to modify
the substance or timing of the Company’s obligation to redeem 100% of the shares of Common Stock if the Company does not complete its initial Business Combination within the period set forth in the Company’s amended and restated
certificate of incorporation, or (e) in connection with the redemption of the shares of Common Stock included in the Units sold in the Offering upon the Company’s failure to complete the Company’s initial Business Combination (any
such non-excluded event being referred to herein as an “Extraordinary Dividend”), then the Warrant Price shall be decreased, effective immediately after the effective date of such
Extraordinary Dividend, by the amount of cash and/or the fair market value (as determined by the Board, in good faith) of any securities or other assets paid on each share of Common Stock in respect of such Extraordinary Dividend. For purposes of
this subsection 4.1.2, “Ordinary Cash Dividends” means any cash dividend or cash distribution which, when combined on a per share basis, with the per share amounts of all other cash dividends and cash distributions paid on
the shares of Common Stock during the 365-day period ending on the date of declaration of such dividend or distribution (as adjusted to appropriately reflect any of the events referred to in other subsections
of this Section 4 and excluding cash dividends or cash distributions that resulted in an adjustment to the Warrant Price or to the number of shares of Common Stock issuable on exercise of each Warrant) does not exceed
$0.50. 
 4.2. Aggregation of Shares. If after the date hereof, and subject to the provisions of Section 4.6
hereof, the number of issued and outstanding shares of Common Stock is decreased by a consolidation, combination, reverse stock split or reclassification of shares of Common Stock or other similar event, then, on the effective date of such
consolidation, combination, reverse stock split, reclassification or similar event, the number of shares of Common Stock issuable on exercise of each Warrant shall be decreased in proportion to such decrease in issued and outstanding shares of
Common Stock. 

 4.3. Adjustments in Warrant Price. 

4.3.1. Adjustment. Whenever the number of shares of Common Stock purchasable upon the exercise of the Warrants is adjusted, as provided
in Section 4.1 or 4.2 hereof, the Warrant Price shall be adjusted (to the nearest cent) by multiplying such Warrant Price immediately prior to such adjustment by a fraction (x) the numerator of which shall be
the number of shares of Common Stock purchasable upon the exercise of the Warrants immediately prior to such adjustment, and (y) the denominator of which shall be the number of shares of Common Stock so purchasable immediately thereafter.. 

4.3.2. Additional Shares. If (x) the Company issues additional shares of Common Stock or securities convertible into or
exercisable or exchangeable for shares of Common Stock for capital raising purposes in connection with the closing of its initial Business Combination at an issue price or effective issue price of less than $9.20 per share of Common Stock, with such
issue price or effective issue price to be determined in good faith by the Board (and in the case of any such issuance to the Sponsor or their affiliates, without taking into account any founder shares held by the Sponsor or their affiliates, as
applicable, prior to such issuance) (the “Newly Issued Price”), (y) the aggregate gross proceeds from such issuances represent more than 60% of the total equity proceeds, and interest thereon, available for the funding of an initial
Business Combination on the date of the consummation of such initial Business Combination (net of redemptions), and (z) the volume weighted average trading price of the Common Stock during the 20 trading day period starting on the trading day
prior to the day on which the Company consummates an initial Business Combination (such price, the “Market Value”) is below $9.20 per share, the Warrant Price will be adjusted (to the nearest cent) to be equal to 115% of the higher
of the Market Value and the Newly Issued Price, and the $18.00 per share redemption trigger price (as described in Section 6 hereof) will be adjusted (to the nearest cent) to be equal to 180% of the higher of the Market
Value and the Newly Issued Price. 
 4.4. Replacement of Securities upon Reorganization, etc. In case of any reclassification or
reorganization of the issued and outstanding shares of Common Stock (other than a change covered by Section 4.1 or 4.2 hereof or that solely affects the par value of such shares of Common Stock), or in the case of
any merger or consolidation of the Company with or into another entity in which any “person” or “group” (as such terms are used in Section 13(d) and 14(d) of the Exchange Act) acquires more than 50% of the voting power of
the Company’s securities or conversion of the Company into another type of entity (other than a consolidation or merger in which the Company is the continuing entity and that does not result in any reclassification or reorganization of the
outstanding shares of Common Stock), or in the case of any sale or conveyance to another corporation or entity of the assets or other property of the Company as an entirety or substantially as an entirety in connection with which the Company is
dissolved, the holders of the Warrants shall thereafter have the right to purchase and receive, upon the basis and upon the terms and conditions specified in the Warrants and in lieu of the shares of Common Stock of the Company immediately
theretofore purchasable and receivable upon the exercise of the rights represented thereby, the kind and amount of shares of stock or other securities or property (including cash) receivable upon such reclassification, reorganization, merger or
consolidation, or upon a dissolution following any such sale or transfer, that the holder of the Warrants would have received if such holder had exercised his, her or its Warrant(s) immediately prior to such event (the “Alternative
Issuance”); provided, however, that (i) if the holders of the shares of Common Stock were entitled to exercise a right of election as to the kind or amount of securities, cash or other assets receivable upon such
consolidation or merger, then the kind and 

 
amount of securities, cash or other assets constituting the Alternative Issuance for which each Warrant shall become exercisable shall be deemed to be the weighted average of the kind and amount
received per share by the holders of the shares of Common Stock in such consolidation or merger that affirmatively make such election or (ii) if a tender, exchange or redemption offer shall have been made to and accepted by the shares of Common
Stock (other than a tender, exchange or redemption offer made by the Company in connection with redemption rights held by stockholders of the Company as provided for in the Company’s Amended and Restated Certificate of Incorporation, or as a
result of the redemption of the shares of Common Stock by the Company if a proposed initial Business Combination is presented to the stockholders of the Company for approval) under circumstances in which, upon completion of such tender or exchange
offer, the maker thereof, together with members of any group (within the meaning of Rule 13d-5(b)(1) under the Exchange Act) of which such maker is a part, and together with any affiliate or associate of such
maker (within the meaning of Rule 12b-2 under the Exchange Act) and any members of any such group of which any such affiliate or associate is a part, own beneficially (within the meaning of Rule 13d-3 under the Exchange Act) securities representing more than 50% of the aggregate voting power, including the power to vote on the election of directors of the Company, of the issued and outstanding equity
securities of the Company, and (for the avoidance of doubt) such tender offer results in a change of control of the Company, the holder of a Warrant shall be entitled to receive as the Alternative Issuance, the highest amount of cash, securities or
other property to which such holder would actually have been entitled as a stockholder if such Warrant holder had exercised the Warrant prior to the expiration of such tender or exchange offer, accepted such offer and all of the shares of Common
Stock held by such holder had been purchased pursuant to such tender or exchange offer, subject to adjustments (from and after the consummation of such tender or exchange offer) as nearly equivalent as possible to the adjustments provided for in
this Section 4 and, in each case, if less than seventy percent (70%) of the consideration receivable by the holders of the shares of Common Stock in the applicable event is payable in the form of common stock in the
successor entity that is listed for trading on a national securities exchange or is quoted in an established over-the-counter market, or is to be so listed for trading
or quoted immediately following such event, and if the Registered Holder properly exercises the Warrant within thirty (30) days following the public disclosure of the consummation of such applicable event by the Company pursuant to a current
report on Form 8-K filed with the Commission, the Warrant Price shall be reduced by an amount (in dollars) equal to the difference, if positive, of (i) the Warrant Price in effect prior to such reduction
minus (ii) (A) the Per Share Consideration (as defined below) (but in no event less than zero) minus (B) the Black-Scholes Warrant Value (as defined below) (which amount determined under this clause (ii) shall not be less than zero).
The “Black-Scholes Warrant Value” means the value of a Warrant immediately prior to the consummation of the applicable event based on the Black-Scholes Warrant Model for an uncapped American Call on Bloomberg Financial Markets
(“Bloomberg”), as calculated by an accounting, appraisal, investment banking firm or consultant of nationally recognized standing that is, in the good faith judgment of the Board, qualified to make such calculation. For purposes of
calculating such amount, (1) the price of each share of Common Stock shall be the average last reported sale price of the Common Stock as reported during the ten (10) trading day period ending on the trading day prior to the effective date
of the applicable event, (2) the assumed volatility shall be the ninety (90) day volatility obtained from the HVT function on Bloomberg determined as of the trading day immediately prior to the day of the announcement of the applicable
event unless the third party valuation firm definitively determines that a different volatility is more appropriate, and (3) the assumed risk-free interest rate shall correspond to the U.S. Treasury rate for a period equal to the remaining

 
term of the Warrant. “Per Share Consideration” means (i) if the consideration paid to holders of the shares of Common Stock consists exclusively of cash, the amount of such
cash per share of Common Stock, and (ii) in all other cases, the volume weighted average price of the shares of Common Stock as reported during the ten (10) trading day period ending on the trading day prior to the effective date of the
applicable event. If any reclassification or reorganization also results in a change in shares of Common Stock covered by subsection 4.1.1 hereof, then such adjustment shall be made pursuant to subsection 4.1.1 or Sections 4.2,
or 4.3 hereof and this Section 4.4. The provisions of this Section 4.4 shall similarly apply to successive reclassifications, reorganizations, mergers or consolidations, sales or other
transfers. In no event will the Warrant Price be reduced to less than the par value per share issuable upon exercise of the Warrant. 
 4.5.
Notices of Changes in Warrant. Upon every adjustment of the Warrant Price or the number of shares of Common Stock issuable upon exercise of a Warrant, the Company shall give written notice thereof to the Warrant Agent, which notice shall
state the Warrant Price resulting from such adjustment and the increase or decrease, if any, in the number of shares of Common Stock purchasable at such price upon the exercise of a Warrant, setting forth in reasonable detail the method of
calculation and the facts upon which such calculation is based; provided, however, that no adjustment to the number of shares of Common Stock issuable upon exercise of a Warrant shall be required until cumulative adjustments amount to one percent
(1%) or more of the number of shares of Common Stock issuable upon exercise of a Warrant as last adjusted; provided, further, that any such adjustments that are not made are carried forward and taken into account in any subsequent adjustment.
Notwithstanding the foregoing, all such carried forward adjustments shall be made (i) in connection with any subsequent adjustment that (taken together with such carried forward adjustments) would result in a change of at least one percent (1%)
in the number of shares of Common Stock issuable upon exercise of a Warrant and (ii) on the exercise date of any Warrant. Upon the occurrence of any event specified in Sections 4.1, 4.2, 4.3 or 4.4 hereof, the
Company shall give written notice of the occurrence of such event to each holder of a Warrant, at the last address set forth for such holder in the Warrant Register, of the record date or the effective date of the event. Failure to give such notice,
or any defect therein, shall not affect the legality or validity of such event. 
 4.6. No Fractional Shares. Notwithstanding any
provision contained in this Agreement to the contrary, the Company shall not issue a fractional share of Common Stock upon the exercise of Warrants. If, by reason of any adjustment made pursuant to this Section 4, the
holder of any Warrant would be entitled, upon the exercise of such Warrant, to receive a fractional interest in a share, the Company shall, upon such exercise, round down to the nearest whole number the number of shares of Common Stock to be issued
to such holder. 
 4.7. Form of Warrant. The form of Warrant need not be changed because of any adjustment pursuant to this
Section 4, and Warrants issued after such adjustment may state the same Warrant Price and the same number of shares of Common Stock as is stated in the Warrants initially issued pursuant to this Agreement; provided,
however, that the Company may at any time in its sole discretion make any change in the form of Warrant that the Company may deem appropriate and that does not affect the substance thereof, and any Warrant thereafter issued or countersigned,
whether in exchange or substitution for an outstanding Warrant or otherwise, may be in the form as so changed. 

 5. Transfer and Exchange of Warrants. 

5.1. Transferability. The Warrants and any shares of Common Stock held by the Sponsor or any Permitted Transferees and issued upon
exercise of the Warrants may only be transferred by the holders thereof: 
 (a) to any persons (including their affiliates
and members) participating in the private placement of the Private Placement Warrants; 
 (b) among 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, however, that, in the case of clauses (a) through (h), any such transferees (the “Permitted Transferees”)
enter into a written agreement with the Company agreeing to be bound by the transfer restrictions in this Agreement. 
 5.2. Registration
of Transfer. The Warrant Agent shall register the transfer, from time to time, of any outstanding Warrant upon the Warrant Register, upon surrender of such Warrant for transfer, properly endorsed with signatures properly guaranteed and
accompanied by appropriate instructions for transfer. Upon any such transfer, a new Warrant representing an equal aggregate number of Warrants shall be issued and the old Warrant shall be cancelled by the Warrant Agent. In the case of certificated
Warrants, the Warrants so cancelled shall be delivered by the Warrant Agent to the Company from time to time upon request. 
 5.3.
Procedure for Surrender of Warrants. Warrants may be surrendered to the Warrant Agent, together with a written request for exchange or transfer, and thereupon the Warrant Agent shall issue in exchange therefor one or more new Warrants as
requested by the Registered Holder of the Warrants so surrendered, representing an equal aggregate number of Warrants; 

 
provided, however, that, except as otherwise provided herein or with respect to any Book-Entry Warrant, each Book-Entry Warrant may be transferred only in whole and only to the
Depository, to another nominee of the Depository, to a successor depository or to a nominee of a successor depository; provided, further, that in the event that a Warrant surrendered for transfer bears a restrictive legend, the Warrant
Agent shall not cancel such Warrant and issue new Warrants in exchange thereof until the Warrant Agent has received an opinion of counsel for the Company stating that such transfer may be made and indicating whether the new Warrants must also bear a
restrictive legend. 
 5.4. Transfers of Fractions of Warrants. The Warrant Agent shall not be required to effect any registration of
transfer or exchange of Warrants which would result in the issuance of a Warrant certificate or book-entry position for a fraction of a Warrant. 

5.5. Service Charges. No service charge shall be made for any exchange or registration of transfer of Warrants. 

5.6. Warrant Execution and Countersignature. The Warrant Agent is hereby authorized to countersign and to deliver, in accordance with
the terms of this Agreement, the Warrants required to be issued pursuant to the provisions of this Section 5, and the Company, whenever required by the Warrant Agent, shall supply the Warrant Agent with Warrants duly
executed on behalf of the Company for such purpose. 
 6. Other Provisions Relating to Rights of Holders of Warrants. 

6.1. No Rights as Stockholder. A Warrant does not entitle the Registered Holder thereof to any of the rights of a stockholder of the
Company, including, without limitation, the right to receive dividends, or other distributions, exercise any preemptive rights to vote or to consent or to receive notice as stockholder in respect of the meetings of shareholders or the election of
directors of the Company or any other matter. 
 6.2. Lost, Stolen, Mutilated, or Destroyed Warrants. If any Warrant is lost, stolen,
mutilated or destroyed, the Company and the Warrant Agent may on such terms as to indemnity or otherwise as they may in their discretion impose (which shall, in the case of a mutilated Warrant, include the surrender thereof), issue a new Warrant of
like denomination, tenor and date as the Warrant so lost, stolen, mutilated or destroyed. Any such new Warrant shall constitute a substitute contractual obligation of the Company, whether or not the allegedly lost, stolen, mutilated or destroyed
Warrant shall be at any time enforceable by anyone. 
 6.3. Reservation of Shares of Common Stock. The Company shall at all times
reserve and keep available a number of its authorized but unissued shares of Common Stock that shall be sufficient to permit the exercise in full of all outstanding Warrants issued pursuant to this Agreement. 

7. Concerning the Warrant Agent and Other Matters. 

7.1. Payment of Taxes. The Company shall from time to time promptly pay all taxes and charges that may be imposed upon the Company or
the Warrant Agent in respect of the issuance or delivery of shares of Common Stock upon the exercise of the Warrants, but the Company and the Warrant Agent shall not be obligated to pay any transfer taxes in respect of the Warrants or such shares of
Common Stock. 

 7.2. Resignation, Consolidation, or Merger of Warrant Agent. 

7.2.1. Appointment of Successor Warrant Agent. The Warrant Agent, or any successor to it hereafter appointed, may resign its duties and
be discharged from all further duties and liabilities hereunder after giving sixty (60) days’ notice in writing to the Company. If the office of the Warrant Agent becomes vacant by resignation or incapacity to act or otherwise, the Company
shall appoint in writing a successor Warrant Agent in place of the Warrant Agent. If the Company shall fail to make such appointment within a period of thirty (30) days after it has been notified in writing of such resignation or incapacity by
the Warrant Agent or by the holder of a Warrant (who shall, with such notice, submit his, her or its Warrant for inspection by the Company), then the holder of any Warrant may apply to the Supreme Court of the State of New York for the County of New
York for the appointment of a successor Warrant Agent at the Company’s cost. Any successor Warrant Agent, whether appointed by the Company or by such court, shall be a corporation or other entity organized and existing under the laws of the
State of New York, in good standing and having its principal office in the Borough of Manhattan, City and State of New York, and authorized under such laws to exercise corporate trust powers and subject to supervision or examination by federal or
state authority. After appointment, any successor Warrant Agent shall be vested with all the authority, powers, rights, immunities, duties, and obligations of its predecessor Warrant Agent with like effect as if originally named as Warrant Agent
hereunder, without any further act or deed; but if for any reason it becomes necessary or appropriate, the predecessor Warrant Agent shall execute and deliver, at the expense of the Company, an instrument transferring to such successor Warrant Agent
all the authority, powers, and rights of such predecessor Warrant Agent hereunder; and upon request of any successor Warrant Agent the Company shall make, execute, acknowledge, and deliver any and all instruments in writing for more fully and
effectually vesting in and confirming to such successor Warrant Agent all such authority, powers, rights, immunities, duties, and obligations. 

7.2.2. Notice of Successor Warrant Agent. In the event a successor Warrant Agent shall be appointed, the Company shall give notice
thereof to the predecessor Warrant Agent and the Transfer Agent for the shares of Common Stock not later than the effective date of any such appointment. 

7.2.3. Merger or Consolidation of Warrant Agent. Any entity into which the Warrant Agent may be merged or with which it may be
consolidated or any entity resulting from any merger or consolidation to which the Warrant Agent shall be a party shall be the successor Warrant Agent under this Agreement without any further act. 

7.3. Fees and Expenses of Warrant Agent. 

7.3.1. Remuneration. The Company agrees to pay the Warrant Agent reasonable remuneration for its services as such Warrant Agent
hereunder and shall, pursuant to its obligations under this Agreement, reimburse the Warrant Agent upon demand for all expenditures that the Warrant Agent may reasonably incur in the execution of its duties hereunder. 

 7.3.2. Further Assurances. The Company agrees to perform, execute, acknowledge, and
deliver or cause to be performed, executed, acknowledged, and delivered all such further and other acts, instruments, and assurances as may reasonably be required by the Warrant Agent for the carrying out or performing of the provisions of this
Agreement. 
 7.4. Liability of Warrant Agent. 

7.4.1. Reliance on Company Statement. Whenever in the performance of its duties under this Agreement, the Warrant Agent shall deem it
necessary or desirable that any fact or matter be proved or established by the Company prior to taking or suffering any action hereunder, such fact or matter (unless other evidence in respect thereof be herein specifically prescribed) may be deemed
to be conclusively proved and established by a statement signed by the Chairman of the Board, Chief Executive Officer, Chief Financial Officer, the President or the Secretary or other principal officer of the Company and delivered to the Warrant
Agent. The Warrant Agent may rely upon such statement for any action taken or suffered in good faith by it pursuant to the provisions of this Agreement. 

7.4.2. Indemnity. The Warrant Agent shall be liable hereunder only for its own, or its representatives’, gross negligence, willful
misconduct, fraud, bad faith or material breach of this Agreement. The Company agrees to indemnify the Warrant Agent and save it harmless against any and all liabilities, including judgments, out-of-pocket costs and reasonable outside counsel fees, for anything done or omitted by the Warrant Agent in the execution of this Agreement, except as a result of the Warrant Agent’s or its
representatives’ gross negligence, willful misconduct, fraud, bad faith or material breach of this Agreement. 
 7.4.3.
Exclusions. The Warrant Agent shall have no responsibility with respect to the validity of this Agreement or with respect to the validity or execution of any Warrant (except its countersignature thereof). The Warrant Agent shall not be
responsible for any breach by the Company of any covenant or condition contained in this Agreement or in any Warrant. The Warrant Agent shall not be responsible to make any adjustments required under the provisions of Section 4
hereof or responsible for the manner, method, or amount of any such adjustment or the ascertaining of the existence of facts that would require any such adjustment; nor shall it by any act hereunder be deemed to make any representation or warranty
as to the authorization or reservation of any shares of Common Stock to be issued pursuant to this Agreement or any Warrant or as to whether any shares of Common Stock shall, when issued, be valid and fully paid and
non-assessable. 
 7.5. Acceptance of Agency. The Warrant Agent hereby accepts the agency
established by this Agreement and agrees to perform the same upon the terms and conditions herein set forth and among other things, shall account promptly to the Company with respect to Warrants exercised and concurrently account for, and pay to the
Company, all monies received by the Warrant Agent for the purchase of shares of Common Stock through the exercise of the Warrants. 
 7.6.
Waiver. The Warrant Agent has no 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 Warrant 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. The Warrant Agent hereby waives any and all Claims against the Trust Account and any and all rights to seek access to the Trust Account. 

 8. Miscellaneous Provisions. 

8.1. Successors. All the covenants and provisions of this Agreement by or for the benefit of the Company or the Warrant Agent shall bind
and inure to the benefit of their respective successors and assigns. 
 8.2. Notices. Any notice, statement or demand authorized by
this Agreement to be given or made by the Warrant Agent or by the holder of any Warrant to or on the Company shall be sufficiently given when so delivered if by hand or overnight delivery or if sent by certified mail or private courier service
within five (5) days after deposit of such notice, postage prepaid, addressed (until another address is filed in writing by the Company with the Warrant Agent), as follows: 

Atlantic Coastal Acquisition Corp. II 

6 St Johns Lane 
 New York, New
York 10013 
 Attn: Shahraab Ahmad 

Email: shahraab@atlanticcoastalacquisition.com 

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

Pillsbury Winthrop Shaw Pittman LLP 

31 W 52nd Street 
 New York, New
York 10019 
 Attn: Stephen Ashley 

Email: stephen.ashley@pillsburylaw.com 

Any notice, statement or demand authorized by this Agreement to be given or made by the holder of any Warrant or by the Company to or on the
Warrant Agent shall be sufficiently given when so delivered if by hand or overnight delivery or if sent by certified mail or private courier service within five (5) days after deposit of such notice, postage prepaid, addressed (until another
address is filed in writing by the Warrant Agent with the Company), as follows: 
 Continental Stock Transfer & Trust Company 

1 State Street, 30th Floor 

New York, NY 10004 
 Attn: Stacy
Aqui 
 Email: saqui@continentalstock.com 

in each case, with a copy to: 

Pillsbury Winthrop Shaw Pittman LLP 

31 W 52nd Street 
 New York, New
York 10019 

 Attn: Stephen Ashley 

Email: stephen.ashley@pillsburylaw.com 

and 
 Cantor
Fitzgerald & Co. 
 [•] 

New York, New York [•] 

Attn: [•] 
 Email: [•]

 and 
 Ellenoff
Grossman & Schole LLP 
 1345 Avenue of the Americas 

New York, New York 10105 
 Attn:
Stuart Neuhauser, Esq. 
 Email: sneuhauser@egsllp.com 

8.3. Applicable Law; Exclusive Forum. The validity, interpretation, and performance of this Agreement and of the Warrants shall be
governed in all respects by 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. Subject to applicable law, the Company hereby
agrees that any action, proceeding or claim against it arising out of or relating in any way to this Agreement shall be brought and enforced in the courts of the State of New York or the United States District Court for the Southern District of New
York, and irrevocably submits to such jurisdiction, which jurisdiction shall be exclusive forum for any such action, proceeding or claim. The Company hereby waives any objection to such exclusive jurisdiction and that such courts represent an
inconvenient forum. Notwithstanding the foregoing, the provisions of this paragraph will not apply to suits brought to enforce any liability or duty created by the Exchange Act or any other claim for which the federal district courts of the United
States of America are the sole and exclusive forum. Any person or entity purchasing or otherwise acquiring any interest in the Warrants shall be deemed to have notice of and to have consented to the forum provisions in this
Section 8.3. If any action, the subject matter of which is within the scope of the forum provisions above, is filed in a court other than a court located within the State of New York or the United States District Court for
the Southern District of New York (a “foreign action”) in the name of any Warrant holder, such Warrant holder shall be deemed to have consented to: (x) the personal jurisdiction of the state and federal courts located within the State
of New York or the United States District Court for the Southern District of New York in connection with any action brought in any such court to enforce the forum provisions (an “enforcement action”), and (y) having service of process
made upon such Warrant holder in any such enforcement action by service upon such warrant holder’s counsel in the foreign action as agent for such warrant holder. 

8.4. Persons Having Rights under this Agreement. Nothing in this Agreement shall be construed to confer upon, or give to, any person,
corporation or other entity other than the parties hereto and the Registered Holders of the Warrants any right, remedy or claim under or by reason of this Agreement or of any covenant, condition, stipulation, promise or agreement hereof. All
covenants, conditions, stipulations, promises, and agreements contained in this Agreement shall be for the sole and exclusive benefit of the parties hereto and their successors and assigns and of the Registered Holders of the Warrants. 

 8.5. Examination of the Warrant Agreement. A copy of this Agreement shall be
available at all reasonable times at the office of the Warrant Agent in the Borough of Manhattan, City and State of New York, for inspection by the Registered Holder of any Warrant. The Warrant Agent may require any such holder to submit such
holder’s Warrant for inspection by the Warrant Agent. 
 8.6. Counterparts; Electronic Signatures. This 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. A signature to this Agreement
transmitted electronically shall have the same authority, effect and enforceability as an original signature. 
 8.7. Effect of
Headings. The section headings herein are for convenience only and are not part of this Agreement and shall not affect the interpretation thereof. 

8.8. Amendments. This Agreement may be amended by the parties hereto without the consent of any Registered Holder for the purpose of
(i) curing any ambiguity or to correct any mistake or defective provision contained herein, including to conform the provisions hereof to the description of the terms of the Warrants and this Agreement set forth in the Prospectus,
(ii) adding or changing any provisions with respect to matters or questions arising under this Agreement as the parties may deem necessary or desirable and that the parties deem shall not adversely affect the rights of the Registered Holders or
(iii) to provide for the delivery of an Alternative Issuance pursuant to Section 4.4 hereof. All other modifications or amendments, including any modification or amendment to increase the Warrant Price or shorten the Exercise Period, shall
require the vote or written consent of the Registered Holders of fifty percent (50%) of the then outstanding Warrants. Notwithstanding the foregoing, the Company may lower the Warrant Price or extend the duration of the Exercise Period pursuant to
Sections 3.1 and 3.2 hereof, respectively, without the consent of the Registered Holders. The Company covenants and agrees to not lower the Warrant Price or extend the duration of the Exercise Period of the Warrants without taking the
same actions with respect to the Public Warrants. 
 8.9. 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 and be valid and enforceable. 

 IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be duly executed as of
the date first above written. 
  

			
	ATLANTIC COASTAL ACQUISITION CORP. II
		
	By:	 	  

	Name:	 	Shahraab Ahmad
	Title:	 	Chief Executive Officer
	
	CONTINENTAL STOCK TRANSFER & TRUST COMPANY, as Warrant Agent
		
	By:	 	  

	Name:	 	Stacy Aqui
	Title:	 	Vice President

 [Signature Page to Warrant Agreement] 

 EXHIBIT A 

LEGEND 
 “THE SECURITIES REPRESENTED
BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR ANY STATE SECURITIES LAWS, AND MAY NOT BE OFFERED, SOLD, TRANSFERRED OR OTHERWISE DISPOSED OF UNLESS REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED, AND ANY APPLICABLE STATE SECURITIES LAWS OR AN EXEMPTION FROM REGISTRATION IS AVAILABLE. IN ADDITION, SUBJECT TO ANY ADDITIONAL LIMITATIONS ON TRANSFER DESCRIBED IN THE LETTER AGREEMENT BY AND AMONG ATLANTIC COASTAL ACQUISITION CORP. II
(THE “COMPANY”), ATLANTIC COASTAL ACQUISITION MANAGEMENT II LLC AND THE OTHER PARTIES THERETO, THE SECURITIES REPRESENTED BY THIS CERTIFICATE MAY NOT BE SOLD OR TRANSFERRED PRIOR TO THE DATE THAT IS THIRTY (30) DAYS AFTER THE DATE
UPON WHICH THE COMPANY COMPLETES ITS INITIAL BUSINESS COMBINATION (AS DEFINED IN SECTION 3 OF THE WARRANT AGREEMENT REFERRED TO HEREIN) EXCEPT TO A PERMITTED TRANSFEREE (AS DEFINED IN SECTION 5 OF THE WARRANT AGREEMENT) WHO AGREES IN WRITING WITH
THE COMPANY TO BE SUBJECT TO SUCH TRANSFER PROVISIONS. 
 SECURITIES EVIDENCED BY THIS CERTIFICATE AND SHARES OF COMMON STOCK OF THE COMPANY ISSUED UPON
EXERCISE OF SUCH SECURITIES SHALL BE ENTITLED TO REGISTRATION RIGHTS UNDER A REGISTRATION RIGHTS AGREEMENT TO BE EXECUTED BY THE COMPANY.” 

 EXHIBIT B 

[Form of Warrant Certificate] 

[FACE] 
 Number [__] 

Warrants 
 THIS WARRANT
SHALL BE NULL AND VOID IF NOT EXERCISED PRIOR 
 TO THE EXPIRATION OF THE EXERCISE PERIOD PROVIDED FOR 

IN THE WARRANT AGREEMENT DESCRIBED BELOW 

ATLANTIC COASTAL ACQUISITION CORP. II 

Incorporated Under the Laws of the State of Delaware 

CUSIP [__] 
 Warrant Certificate

 This Warrant Certificate certifies
that                 , or registered assigns, is the registered holder of warrant(s) evidenced hereby (the “Warrants” and each, a
“Warrant”) to purchase shares of Series A common stock, $0.0001 par value per share (“Common Stock”), of Atlantic Coastal Acquisition Corp. II, a Delaware corporation (the
“Company”). Each whole Warrant entitles the holder, upon exercise during the period set forth in the Warrant Agreement referred to below, to receive from the Company that number of fully paid and non-assessable shares of Common Stock as set forth below, at the exercise price (the “Warrant Price”) as determined pursuant to the Warrant Agreement, payable in lawful money of the United
States of America upon surrender of this Warrant Certificate and payment of the Warrant Price (or through “cashless exercise” as provided for in the Warrant Agreement) at the office or agency of the Warrant Agent referred to
below, subject to the conditions set forth herein and in the Warrant Agreement. Defined terms used in this Warrant Certificate but not defined herein shall have the meanings given to them in the Warrant Agreement. 

Each whole Warrant is initially exercisable for one fully paid and non-assessable share of Common
Stock. No fractional shares will be issued upon exercise of any Warrant. If, upon the exercise of Warrants, a holder would be entitled to receive a fractional interest in a share of Common Stock, the Company will, upon exercise, round down to the
nearest whole number of the number of shares of Common Stock to be issued to the holder of the Warrant. The number of shares of Common Stock issuable upon exercise of the Warrants is subject to adjustment upon the occurrence of certain events as set
forth in the Warrant Agreement. 
 The initial Warrant Price per share of Common Stock for any Warrant is equal to $11.50 per share. The
Warrant Price is subject to adjustment upon the occurrence of certain events as set forth in the Warrant Agreement. 
 Subject to the
conditions set forth in the Warrant Agreement, the Warrants may be exercised only during the Exercise Period and to the extent not exercised by the end of such Exercise Period, such Warrants shall become null and void. 

 Reference is hereby made to the further provisions of this Warrant Certificate set forth on
the reverse hereof and such further provisions shall for all purposes have the same effect as though fully set forth at this place. 
 This
Warrant Certificate shall not be valid unless countersigned by the Warrant Agent, as such term is used in the Warrant Agreement. 
 This
Warrant Certificate shall be governed by and construed in accordance with the internal laws of the State of New York, without regard to conflicts of laws principles thereof. 

 

			
	ATLANTIC COASTAL ACQUISITION CORP. II
	By:	 	  

		 	Name:
		 	Title:
	
	CONTINENTAL STOCK TRANSFER & TRUST COMPANY, as Warrant Agent
	By:	 	  

		 	Name:
		 	Title:

 [Form of Warrant Certificate] 

[Reverse] 
 The Warrants evidenced
by this Warrant Certificate are part of a duly authorized issue of Warrants entitling the holder on exercise to receive shares of Common Stock and are issued or to be issued pursuant to a Warrant Agreement dated as of [__], 20[__] (the
“Warrant Agreement”), duly executed and delivered by the Company to Continental Stock Transfer & Trust Company, a New York limited purpose trust company, as warrant agent (or successor warrant agent) (collectively,
the “Warrant Agent”), which Warrant Agreement is hereby incorporated by reference in and made a part of this instrument and is hereby referred to for a description of the rights, limitation of rights, obligations, duties and
immunities thereunder of the Warrant Agent, the Company and the holders (the words “holders” or “holder” meaning the Registered Holders or Registered Holder, respectively) of the Warrants. A copy of
the Warrant Agreement may be obtained by the holder hereof upon written request to the Company. Defined terms used in this Warrant Certificate but not defined herein shall have the meanings given to them in the Warrant Agreement. 

Warrants may be exercised at any time during the Exercise Period set forth in the Warrant Agreement. The holder of Warrants evidenced by this
Warrant Certificate may exercise them by surrendering this Warrant Certificate, with the form of election to purchase set forth hereon properly completed and executed, together with payment of the Warrant Price as specified in the Warrant Agreement
(or through “cashless exercise” as provided for in the Warrant Agreement) at the principal corporate trust office of the Warrant Agent. In the event that upon any exercise of Warrants evidenced hereby the number of Warrants
exercised shall be less than the total number of Warrants evidenced hereby, there shall be issued to the holder hereof or his, her or its assignee, a new Warrant Certificate evidencing the number of Warrants not exercised. 

Notwithstanding anything else in this Warrant Certificate or the Warrant Agreement, no Warrant may be exercised unless at the time of exercise
(i) a registration statement covering the shares of Common Stock to be issued upon exercise is effective under the Securities Act and (ii) a prospectus thereunder relating to the shares of Common Stock is current, except through
“cashless exercise” as provided for in the Warrant Agreement. 
 The Warrant Agreement provides that upon the occurrence of
certain events the number of shares of Common Stock issuable upon exercise of the Warrants and the Warrant Price set forth on the face hereof may, subject to certain conditions, be adjusted. If, upon exercise of a Warrant, the holder thereof would
be entitled to receive a fractional interest in Common Stock, the Company shall, upon exercise, round down to the nearest whole number of shares of Common Stock to be issued to the holder of the Warrant. 

This Warrant Certificate, when surrendered at the principal corporate trust office of the Warrant Agent by the Registered Holder thereof in
person or by legal representative or attorney duly authorized in writing, may be exchanged, in the manner and subject to the limitations provided in the Warrant Agreement, but without payment of any service charge, for another Warrant Certificate or
Warrant Certificates of like tenor evidencing in the aggregate a like number of Warrants. 

 Upon due presentation for registration of transfer of this Warrant Certificate at the office
of the Warrant Agent a new Warrant Certificate or Warrant Certificates of like tenor and evidencing in the aggregate a like number of Warrants shall be issued to the transferee(s) in exchange for this Warrant Certificate, subject to the limitations
provided in the Warrant Agreement, without charge except for any tax or other governmental charge imposed in connection therewith. 
 The
Company and the Warrant Agent may deem and treat the Registered Holder(s) hereof as the absolute owner(s) of this Warrant Certificate (notwithstanding any notation of ownership or other writing hereon made by anyone), for the purpose of any exercise
hereof, of any distribution to the holder(s) hereof, and for all other purposes, and neither the Company nor the Warrant Agent shall be affected by any notice to the contrary. Neither the Warrants nor this Warrant Certificate entitles any holder
hereof to any rights of a stockholder of the Company. 

 Election to Purchase 

(To Be Executed Upon Exercise of Warrant) 

The undersigned hereby irrevocably elects to exercise the right, represented by this Warrant Certificate, to receive shares of Common Stock
and herewith tenders payment for such shares of Common Stock to the order of Atlantic Coastal Acquisition Corp. II (the “Company”) in the amount of
$                in accordance with the terms hereof. The undersigned requests that a certificate for such shares of Common Stock be registered in the name
of                 , whose address is and that such shares of Common Stock be delivered to whose address
is                . If said number of shares of Common Stock is less than all of the shares of Common Stock purchasable hereunder, the undersigned requests that a new
Warrant Certificate representing the remaining balance of such shares of Common Stock be registered in the name of                 , whose address
is                and that such Warrant Certificate be delivered to                 ,
whose address is                . 
 In the event that the
Warrant is to be exercised on a “cashless” basis pursuant to Section 3.3.1(b) of the Warrant Agreement, the number of shares of Common Stock that this Warrant is exercisable for shall be determined in accordance
with 3.3.1(b) of the Warrant Agreement. 
 In the event that the Warrant may be exercised, to the extent allowed by the Warrant
Agreement, through cashless exercise (i) the number of shares of Common Stock that this Warrant is exercisable for would be determined in accordance with the relevant section of the Warrant Agreement which allows for such cashless exercise and
(ii) the holder hereof shall complete the following: The undersigned hereby irrevocably elects to exercise the right, represented by this Warrant Certificate, through the cashless exercise provisions of the Warrant Agreement, to receive shares
of Common Stock. If said number of shares of Common Stock is less than all of the shares of Common Stock purchasable hereunder (after giving effect to the cashless exercise), the undersigned requests that a new Warrant Certificate representing the
remaining balance of such shares of Common Stock be registered in the name of                 , whose address
is                 and that such Warrant Certificate be delivered to                ,
whose address is                . 
 [Signature Page follows]

 Date: __, 20[ ] 

 

	
	(Signature)
	
	
	(Address)
	
	 
	(Tax Identification Number)

 Signature Guaranteed: 

THE SIGNATURE(S) SHOULD 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 SECURITIES AND EXCHANGE COMMISSION RULE 17Ad-15 (OR ANY SUCCESSOR RULE) UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED).EX-10.3

 Exhibit 10.3 

Atlantic Coastal Acquisition Corp. II 

6 St Johns Lane, Floor 5 

New York, NY 10013 

October 25, 2021 
 Atlantic Coastal
Acquisition Management II LLC 
 6 St Johns Lane, Floor 5 
 New
York, NY 10013 
 RE: Securities Subscription Agreement  

Ladies and Gentlemen: 
 This agreement (the
“Agreement”) is entered into on October 25, 2021 by and between Atlantic Coastal Acquisition Management II LLC, a Delaware limited liability company (the “Subscriber” or “you”), and Atlantic
Coastal Acquisition Corp. II, a Delaware corporation (the “Company,” “we” or “us”). Pursuant to the terms hereof, the Company hereby accepts the offer the Subscriber has made to purchase 7,180,305
shares of Series B common stock, $0.0001 par value per share (together with the 7,195 shares of Series B common stock, $0.0001 par value per share previously acquired by Subscriber, the “Shares”), up to 937,500 of which are subject
to forfeiture by you if the underwriters of the initial public offering (“IPO”) of units (“Units”) of the Company do not fully exercise their over-allotment option (the “Over-allotment Option”). The
Company and the Subscriber’s agreements regarding such Shares are as follows: 
  

	 	1.	 Purchase of Securities. 

 

	 	1.1	 Purchase of Shares. For the sum of $24,975 (together with the $25 previously paid for the initial
issuance of 8,625 of the Shares, the “Purchase Price”), which the Company acknowledges receiving in cash, the Company hereby issues the Shares to the Subscriber, and the Subscriber hereby purchases the Shares from the Company,
subject to forfeiture, on the terms and subject to the conditions set forth in this Agreement. Concurrently with the Subscriber’s execution of this Agreement, the Company shall, at its option, deliver to the Subscriber a certificate registered
in the Subscriber’s name representing the shares (the “Original Certificate”), or effect such delivery in book-entry form. 

  

	 	2.	 Representations, Warranties and Agreements. 

 

	 	2.1	 Subscriber’s Representations, Warranties and Agreements. To induce the Company to issue the Shares
to the Subscriber, the Subscriber hereby represents and warrants to the Company and agrees with the Company as follows: 

  

	 	2.1.1	 No Government Recommendation or Approval. The Subscriber understands that no federal or state agency has
passed upon or made any recommendation or endorsement of the offering of the Shares. 

	 	2.1.2	 No Conflicts. The execution, delivery and performance of this Agreement and the consummation by the
Subscriber of the transactions contemplated hereby do not violate, conflict with or constitute a default under (i) the formation and governing documents of the Subscriber, (ii) any agreement, indenture or instrument to which the Subscriber
is a party or (iii) any law, statute, rule or regulation to which the Subscriber is subject, or any agreement, order, judgment or decree to which the Subscriber is subject. 

 

	 	2.1.3	 Organization and Authority. The Subscriber is a Delaware limited liability company, validly existing and
in good standing under the laws of Delaware and possesses all requisite power and authority necessary to carry out the transactions contemplated by this Agreement. Upon execution and delivery by you, this Agreement is a legal, valid and binding
agreement of Subscriber, enforceable against Subscriber in accordance with its terms, except as such enforceability may be limited by applicable bankruptcy, insolvency, fraudulent conveyance or similar laws affecting the enforcement of
creditors’ rights generally and subject to general principles of equity (regardless of whether enforcement is sought in a proceeding at law or in equity). 

 

	 	2.1.4	 Experience, Financial Capability and Suitability. Subscriber is: (i) sophisticated in financial
matters and is able to evaluate the risks and benefits of the investment in the Shares and (ii) able to bear the economic risk of its investment in the Shares for an indefinite period of time because the Shares have not been registered under
the Securities Act as amended (the “Securities Act”) and therefore cannot be sold unless subsequently registered under the Securities Act or an exemption from such registration is available. Subscriber is capable of evaluating the
merits and risks of its investment in the Company and has the capacity to protect its own interests. Subscriber must bear the economic risk of this investment until the Shares are sold pursuant to: (i) an effective registration statement under
the Securities Act or (ii) an exemption from registration available with respect to such sale. Subscriber is able to bear the economic risks of an investment in the Shares and to afford a complete loss of Subscriber’s investment in the
Shares. 

  

	 	2.1.5	 Access to Information; Independent Investigation. Prior to the execution of this Agreement, the
Subscriber has had the opportunity to ask questions of and receive answers from representatives of the Company concerning an investment in the Company, as well as the finances, operations, business and prospects of the Company, and the opportunity
to obtain additional information to verify the accuracy of all information so obtained. In determining whether to make this investment, Subscriber has relied solely on Subscriber’s own knowledge and understanding of the Company and its business
based upon Subscriber’s own due diligence investigation and the information furnished pursuant to this paragraph. Subscriber understands that no person has been authorized to give any information or to make any representations which were not
furnished pursuant to this Section 2 and Subscriber has not relied on any other representations or information in making its investment decision, whether written or oral, relating to the Company, its operations and/or its prospects.

	 	2.1.6	 Regulation D Offering. Subscriber represents that it is an “accredited investor” as such term
is defined in Rule 501(a) of Regulation D under the Securities Act and acknowledges the sale contemplated hereby is being made in reliance on a private placement exemption to “accredited investors” within the meaning of Section 501(a)
of Regulation D under the Securities Act or similar exemptions under state law. 

  

	 	2.1.7	 Investment Purposes. The Subscriber is purchasing the Shares solely for investment purposes, for the
Subscriber’s own account and not for the account or benefit of any other person, and not with a view towards the distribution or dissemination thereof. The Subscriber did not decide to enter into this Agreement as a result of any general
solicitation or general advertising within the meaning of Rule 502 under the Securities Act. 

  

	 	2.1.8	 Restrictions on Transfer; Shell Company. Subscriber understands the Shares are being offered in a
transaction not involving a public offering within the meaning of the Securities Act. Subscriber understands the Shares will be “restricted securities” within the meaning of Rule 144(a)(3) under the Securities Act, and Subscriber
understands that the certificates or book-entries representing the Shares will contain a legend in respect of such restrictions. If in the future the Subscriber decides to offer, resell, pledge or otherwise transfer the Shares, such Shares may be
offered, resold, pledged or otherwise transferred only pursuant to: (i) registration under the Securities Act, or (ii) an available exemption from registration. Subscriber agrees that if any transfer of its Shares or any interest therein
is proposed to be made, as a condition precedent to any such transfer, Subscriber may be required to deliver to the Company an opinion of counsel satisfactory to the Company. Absent registration or an exemption, the Subscriber agrees not to resell
the Shares. Subscriber further acknowledges that because the Company is a shell company, Rule 144 may not be available to the Subscriber for the resale of the Shares until one year following consummation of the initial business combination of the
Company, despite technical compliance with the requirements of Rule 144 and the release or waiver of any contractual transfer restrictions. 

  

	 	2.1.9	 No Governmental Consents. No governmental, administrative or other third party consents or approvals are
required, necessary or appropriate on the part of Subscriber in connection with the transactions contemplated by this Agreement. 

  

	 	2.2	 Company’s Representations, Warranties and Agreements. To induce the Subscriber to purchase the
Shares, the Company hereby represents and warrants to the Subscriber and agrees with the Subscriber as follows: 

  

	 	2.2.1	 Organization and Corporate Power. The Company is a Delaware corporation and is qualified to do business
in every jurisdiction in which the failure to so qualify would reasonably be expected to have a material adverse effect on the financial condition, operating results or assets of the Company. The Company possesses all requisite corporate power and
authority necessary to carry out the transactions contemplated by this Agreement. 

	 	2.2.2	 No Conflicts. The execution, delivery and performance of this Agreement and the consummation by the
Company of the transactions contemplated hereby do not violate, conflict with or constitute a default under (i) the Certificate of Incorporation or Bylaws of the Company, (ii) any agreement, indenture or instrument to which the Company is
a party or (iii) any law, statute, rule or regulation to which the Company is subject, or any agreement, order, judgment or decree to which the Company is subject. 

 

	 	2.2.3	 Title to Securities. Upon issuance in accordance with, and payment pursuant to, the terms hereof, the
Shares will be duly and validly issued, fully paid and non-assessable. Upon issuance in accordance with, and payment pursuant to, the terms hereof, the Subscriber will have or receive good title to the Shares,
free and clear of all liens, claims and encumbrances of any kind, other than (a) transfer restrictions hereunder and other agreements to which the Shares may be subject which have been notified to the Subscriber in writing, (b) transfer
restrictions under federal and state securities laws, and (c) liens, claims or encumbrances imposed due to the actions of the Subscriber. 

  

	 	2.2.4	 No Adverse Actions. There are no actions, suits, investigations or proceedings pending, threatened
against or affecting the Company which: (i) seek to restrain, enjoin, prevent the consummation of or otherwise affect the transactions contemplated by this Agreement or (ii) question the validity or legality of any transactions or seeks to
recover damages or to obtain other relief in connection with any transactions. 

  

	 	3.	 Forfeiture of Shares. 

 

	 	3.1	 Partial or No Exercise of the Over-allotment Option. In the event the Over-allotment
Option granted to the underwriters of the IPO is not exercised in full, the Subscriber acknowledges and agrees that it (or, if applicable, it and any transferees of Shares) shall forfeit any and all rights to such number of Shares (up to an
aggregate of 937,500 Shares and pro rata based upon the percentage of the Over-allotment Option exercised) such that immediately following such forfeiture, the Subscriber (and all other initial stockholders prior to the IPO, if any) will own an
aggregate number of Shares (not including shares of Series A common stock (collectively with Series B common stock, the “Common Stock”) included in Units, issuable upon exercise of any warrants or any shares of Series A common
stock purchased by Subscriber in the IPO or in the aftermarket) equal to 20% of the issued and outstanding shares of Common Stock immediately following the IPO. 

 

	 	3.2	 Termination of Rights as Stockholder. If any of the Shares are forfeited in accordance with this
Section 3, then after such time the Subscriber (or successor in interest), shall no longer have any rights as a holder of such forfeited Shares, and the Company shall take such action as is appropriate to cancel such forfeited Shares.

  

	 	3.3	 Share Certificates. In the event an adjustment to the Original Certificate, if any, is required pursuant
to this Section 3, then the Subscriber shall return such Original Certificate to the Company or its designated agent as soon as practicable upon its receipt of notice from the Company advising Subscriber of such adjustment, following which a
new certificate (the “New Certificate”), if any, shall be issued in such amount representing the adjusted number of Shares held by the Subscriber. The New Certificate, if any, shall be returned to the Subscriber as soon as
practicable. Any such adjustment for any uncertificated securities held by the Subscriber shall be made in book-entry form. 

	 	4.	 Waiver of Liquidation Distributions; Redemption Rights. In connection with the Shares purchased pursuant
to this Agreement, the Subscriber hereby waives any and all right, title, interest or claim of any kind in or to any distributions by the Company from the trust account which will be established for the benefit of the Company’s public
stockholders and into which substantially all of the proceeds of the IPO will be deposited (the “Trust Account”), in the event of a liquidation of the Company upon the Company’s failure to timely complete an initial business
combination. For purposes of clarity, in the event the Subscriber purchases shares of Series A common stock in the IPO or in the aftermarket, any additional shares of Series A common stock so purchased shall be eligible to receive any liquidating
distributions by the Company. However, in no event will the Subscriber have the right to redeem any shares of Common Stock into funds held in the Trust Account upon the successful completion of an initial business combination. 

 

	 	5.	 Restrictions on Transfer. 

 

	 	5.1	 Securities Law Restrictions. In addition to any restrictions to be contained in that certain letter
agreement (commonly known as an “Insider Letter”) to be dated as of the closing of the IPO by and between Subscriber and the Company, Subscriber agrees not to sell, transfer, pledge, hypothecate or otherwise dispose of all or any
part of the Shares unless, prior thereto (a) a registration statement on the appropriate form under the Securities Act and applicable state securities laws with respect to the Shares proposed to be transferred shall then be effective or
(b) the Company has received an opinion from counsel reasonably satisfactory to the Company, that such registration is not required because such transaction is exempt from registration under the Securities Act and the rules promulgated by the
Securities and Exchange Commission thereunder and with all applicable state securities laws. 

  

	 	5.2	 Lock-up. Subscriber acknowledges that the Shares will be subject
to lock-up provisions (the “Lock-up”) contained in the Insider Letter. 

 

	 	5.3	 Restrictive Legends. Any certificates representing the Shares shall have endorsed thereon legends
substantially as follows: 

 “THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED, OR ANY STATE SECURITIES LAWS AND NEITHER THE SECURITIES NOR ANY INTEREST THEREIN MAY BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR OTHERWISE DISPOSED OF EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER SUCH ACT OR SUCH LAWS OR AN
EXEMPTION FROM REGISTRATION UNDER SUCH ACT AND SUCH LAWS WHICH, IN THE OPINION OF COUNSEL, IS AVAILABLE.” 
 “THE SECURITIES REPRESENTED BY THIS
CERTIFICATE ARE SUBJECT TO A LOCKUP AND MAY NOT BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR OTHERWISE DISPOSED DURING THE TERM OF THE LOCKUP.” 

	 	5.4	 Additional Shares or Substituted Securities. In the event of the declaration of a share dividend, the
declaration of an extraordinary dividend payable in a form other than Shares, a spin-off, a share split, an adjustment in conversion ratio, a recapitalization or a similar transaction affecting the
Company’s outstanding Shares without receipt of consideration, any new, substituted or additional securities or other property which are by reason of such transaction distributed with respect to any Shares subject to this Section 5 or into
which such Shares thereby become convertible shall immediately be subject to this Section 5 and Section 3. Appropriate adjustments to reflect the distribution of such securities or property shall be made to the number and/or class of
Shares subject to this Section 5 and Section 3. 

  

	 	5.5	 Registration Rights. Subscriber acknowledges that the Shares are being purchased pursuant to an
exemption from the registration requirements of the Securities Act and will become freely tradable only after certain conditions are met or they are registered pursuant to a registration rights agreement to be entered into with the Company prior to
the closing of the IPO. 

  

	 	6.	 Other Agreements. 

 

	 	6.1	 Further Assurances. Subscriber agrees to execute such further instruments and to take such further
action as may reasonably be necessary to carry out the intent of this Agreement. 

  

	 	6.2	 Notices. All notices, statements or other documents which are required or contemplated by this Agreement
shall be: (i) in writing and delivered personally or sent by first class registered or certified mail, overnight courier service or facsimile or electronic transmission to the address designated in writing, (ii) by facsimile to the number
most recently provided to such party or such other address or fax number as may be designated in writing by such party and (iii) by electronic mail, to the electronic mail address most recently provided to such party or such other electronic
mail address as may be designated in writing by such party. Any notice or other communication so transmitted shall be deemed to have been given on the day of delivery, if delivered personally, on the business day following receipt of written
confirmation, if sent by facsimile or electronic transmission, one (1) business day after delivery to an overnight courier service or five (5) days after mailing if sent by mail. 

 

	 	6.3	 Entire Agreement. This Agreement, together with the Insider Letter and the Registration Rights
Agreement, each substantially in the form to be filed as an exhibit to the Registration Statement on Form S-1 associated with the IPO, embodies the entire agreement and understanding between the Subscriber and
the Company with respect to the subject matter hereof and supersedes all prior oral or written agreements and understandings relating to the subject matter hereof. No statement, representation, warranty, covenant or agreement of any kind not
expressly set forth in this Agreement shall affect, or be used to interpret, change or restrict, the express terms and provisions of this Agreement. 

	 	6.4	 Modifications and Amendments. The terms and provisions of this Agreement may be modified or amended only
by written agreement executed by all parties hereto. 

  

	 	6.5	 Waivers and Consents. The terms and provisions of this Agreement may be waived, or consent for the
departure therefrom granted, only by a written document executed by the party entitled to the benefits of such terms or provisions. No such waiver or consent shall be deemed to be or shall constitute a waiver or consent with respect to any other
terms or provisions of this Agreement, whether or not similar. Each such waiver or consent shall be effective only in the specific instance and for the purpose for which it was given, and shall not constitute a continuing waiver or consent.

  

	 	6.6	 Assignment. The rights and obligations under this Agreement may not be assigned by either party hereto
without the prior written consent of the other party. 

  

	 	6.7	 Benefit. All statements, representations, warranties, covenants and agreements in this Agreement shall
be binding on the parties hereto and shall inure to the benefit of the respective successors and permitted assigns of each party hereto. Nothing in this Agreement shall be construed to create any rights or obligations except among the parties
hereto, and no person or entity shall be regarded as a third-party beneficiary of this Agreement. 

  

	 	6.8	 Governing Law. This Agreement and the rights and obligations of the parties hereunder shall be construed
in accordance with and governed by the laws of New York applicable to contracts wholly performed within the borders of such state, without giving effect to the conflict of law principles thereof. 

 

	 	6.9	 Severability. In the event that any court of competent jurisdiction shall determine that any provision,
or any portion thereof, contained in this Agreement shall be unreasonable or unenforceable in any respect, then such provision shall be deemed limited to the extent that such court deems it reasonable and enforceable, and as so limited shall remain
in full force and effect. In the event that such court shall deem any such provision, or portion thereof, wholly unenforceable, the remaining provisions of this Agreement shall nevertheless remain in full force and effect. 

 

	 	6.10	 No Waiver of Rights, Powers and Remedies. No failure or delay by a party hereto in exercising any right,
power or remedy under this Agreement, and no course of dealing between the parties hereto, shall operate as a waiver of any such right, power or remedy of such party. No single or partial exercise of any right, power or remedy under this Agreement
by a party hereto, nor any abandonment or discontinuance of steps to enforce any such right, power or remedy, shall preclude such party from any other or further exercise thereof or the exercise of any other right, power or remedy hereunder. The
election of any remedy by a party hereto shall not constitute a waiver of the right of such party to pursue other available remedies. No notice to or demand on a party not expressly required under this Agreement shall entitle the party receiving
such notice or demand to any other or further notice or demand in similar or other circumstances or constitute a waiver of the rights of the party giving such notice or demand to any other or further action in any circumstances without such notice
or demand. 

	 	6.11	 Survival of Representations and Warranties. All representations and warranties made by the parties
hereto in this Agreement or in any other agreement, certificate or instrument provided for or contemplated hereby, shall survive the execution and delivery hereof and any investigations made by or on behalf of the parties. 

 

	 	6.12	 No Broker or Finder. Each of the parties hereto represents and warrants to the other that no broker,
finder or other financial consultant has acted on its behalf in connection with this Agreement or the transactions contemplated hereby in such a way as to create any liability on the other. Each of the parties hereto agrees to indemnify and save the
other harmless from any claim or demand for commission or other compensation by any broker, finder, financial consultant or similar agent claiming to have been employed by or on behalf of such party and to bear the cost of legal expenses incurred in
defending against any such claim. 

  

	 	6.13	 Headings and Captions. The headings and captions of the various subdivisions of this Agreement are for
convenience of reference only and shall in no way modify or affect the meaning or construction of any of the terms or provisions hereof. 

  

	 	6.14	 Counterparts. This Agreement may be executed in one or more counterparts, all of which when taken
together shall be considered one and the same agreement and shall become effective when counterparts have been signed by each party and delivered to the other party, it being understood that both parties need not sign the same counterpart. In the
event that any signature is delivered by facsimile transmission or any other form of electronic delivery, such signature shall create a valid and binding obligation of the party executing (or on whose behalf such signature is executed) with the same
force and effect as if such signature page were an original thereof. 

  

	 	6.15	 Construction. The parties hereto have participated jointly in the negotiation and drafting of this
Agreement. If an ambiguity or question of intent or interpretation arises, this Agreement will be construed as if drafted jointly by the parties hereto and no presumption or burden of proof will arise favoring or disfavoring any party hereto because
of the authorship of any provision of this Agreement. The words “include,” “includes,” and “including” will be deemed to be followed by “without limitation.” Pronouns in masculine,
feminine, and neuter genders will be construed to include any other gender, and words in the singular form will be construed to include the plural and vice versa, unless the context otherwise requires. The words “this Agreement,”
“herein,” “hereof,” “hereby,” “hereunder,” and words of similar import refer to this Agreement as a whole and not to any particular subdivision unless expressly so limited. The
parties hereto intend that each representation, warranty, and covenant contained herein will have independent significance. If any party hereto has breached any representation, warranty, or covenant contained herein in any respect, the fact that
there exists another representation, warranty or covenant relating to the same subject matter (regardless of the relative levels of specificity) which such party hereto has not breached will not detract from or mitigate the fact that such party
hereto is in breach of the first representation, warranty, or covenant. 

	 	6.16	 Mutual Drafting. This Agreement is the joint product of the Subscriber and the Company 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. 

 

	 	7.	 Voting and Tender of Shares. Subscriber agrees to vote the Shares in favor of an initial business
combination that the Company negotiates and submits for approval to the Company’s stockholders and shall not seek redemption with respect to such Shares. Additionally, the Subscriber agrees not to tender any Shares in connection with a tender
offer presented to the Company’s stockholders in connection with an initial business combination negotiated by the Company. 

  

	 	8.	 Indemnification. Each party shall indemnify the other against any loss, cost or damages (including
reasonable attorney’s fees and expenses) incurred as a result of such party’s breach of any representation, warranty, covenant or agreement in this Agreement. 

[Signature Page Follows] 

 If the foregoing accurately sets forth our understanding and agreement, please sign the
enclosed copy of this Agreement and return it to us. 
  

			
	Very truly yours,
	ATLANTIC COASTAL ACQUISITION CORP. II
		
	By:	 	 /s/ Shahraab Ahmad

		 	Name: Shahraab Ahmad
		 	Title: Chief Executive Officer

  

			
	Accepted and agreed as of the date first written above.
	ATLANTIC COASTAL ACQUISITION MANAGEMENT II LLC
		
	By:	 	 /s/ Shahraab Ahmad

		 	Name: Shahraab Ahmad
		 	Title: Manager

 [Signature Page to Securities Subscription Agreement]

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