EX-10.3 5 exhibit103-sx1a.htm EX-10.3
Exhibit 10.3
KLAVIYO, INC.
2023 STOCK OPTION AND INCENTIVE PLAN
SECTION 1. GENERAL PURPOSE OF THE PLAN; DEFINITIONS
The name of the plan is the Klaviyo, Inc. 2023 Stock Option and Incentive Plan (the “Plan”). The purpose of the Plan is to encourage and enable the officers, employees, Non-Employee Directors and Consultants of Klaviyo, Inc. (the “Company”) and its Affiliates upon whose judgment, initiative and efforts the Company largely depends for the successful conduct of its business to acquire a proprietary interest in the Company. It is anticipated that providing such persons with a direct stake in the Company’s welfare will assure a closer identification of their interests with those of the Company and its stockholders, thereby stimulating their efforts on the Company’s behalf and strengthening their desire to remain with the Company.
The following terms shall be defined as set forth below:
“Act” means the U.S. Securities Act of 1933, as amended, and the rules and regulations thereunder.
“Administrator” means either the Board or the compensation committee of the Board or a similar committee performing the functions of the compensation committee and which is comprised of not less than two Non-Employee Directors who are independent.
“Affiliate” means, at the time of determination, any “parent” or “subsidiary” of the Company as such terms are defined in Rule 405 of the Act. The Board will have the authority to determine the time or times at which “parent” or “subsidiary” status is determined within the foregoing definition.
“Award” or “Awards,” except where referring to a particular category of grant under the Plan, shall include Incentive Stock Options, Non-Qualified Stock Options, Stock Appreciation Rights, Restricted Stock Units, Restricted Stock Awards, Unrestricted Stock Awards, Cash-Based Awards, and Dividend Equivalent Rights.
“Award Agreement” means a written or electronic document setting forth the terms and provisions applicable to an Award granted under the Plan. Each Award Agreement is subject to the terms and conditions of the Plan.
“Board” means the Board of Directors of the Company.
“Cash-Based Award” means an Award entitling the recipient to receive a cash-denominated payment.
“Code” means the U.S. Internal Revenue Code of 1986, as amended, and any successor Code, and related rules, regulations and interpretations.

“Consultant” means a consultant or adviser who provides bona fide services to the Company or an Affiliate as an independent contractor and who qualifies as a consultant or advisor under Instruction A.1.(a)(1) of Form S-8 under the Act.
“Dividend Equivalent Right” means an Award entitling the grantee to receive credits based on cash dividends that would have been paid on the shares of Stock specified in the Dividend Equivalent Right (or other Award to which it relates) if such shares had been issued to and held by the grantee.
“Effective Date” means the date on which the Plan becomes effective as set forth in Section 19.
“Exchange Act” means the U.S. Securities Exchange Act of 1934, as amended, and the rules and regulations thereunder.
“Fair Market Value” of the Stock on any given date means the fair market value of the Stock determined in good faith by the Administrator; provided, however, that if the Stock is listed on the National Association of Securities Dealers Automated Quotation System (“NASDAQ”), NASDAQ Global Market, The New York Stock Exchange or another national securities exchange or traded on any established market, the determination shall be made by reference to market quotations. If there are no market quotations for such date, the determination shall be made by reference to the last date preceding such date for which there are market quotations; provided further, however, that if the date for which Fair Market Value is determined is the Registration Date, the Fair Market Value shall be the “Price to the Public” (or equivalent) set forth on the cover page for the final prospectus relating to the Company’s initial public offering.
“Incentive Stock Option” means any Stock Option designated and qualified as an “incentive stock option” as defined in Section 422 of the Code.
“Non-Employee Director” means a member of the Board who is not also an employee of the Company or any Subsidiary.
“Non-Qualified Stock Option” means any Stock Option that is not an Incentive Stock Option.
“Option” or “Stock Option” means any option to purchase shares of Stock granted pursuant to Section 5.
“Registration Date” means the date upon which the registration statement on Form S-1 that is filed by the Company with respect to its initial public offering is declared effective by the U.S. Securities and Exchange Commission.
“Restricted Shares” means the shares of Stock underlying a Restricted Stock Award that remain subject to a risk of forfeiture or the Company’s right of repurchase.
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“Restricted Stock Award” means an Award of Restricted Shares subject to such restrictions and conditions as the Administrator may determine at the time of grant.
“Restricted Stock Units” means an Award of stock units subject to such restrictions and conditions as the Administrator may determine at the time of grant.
“Sale Event” shall mean (i) the sale of all or substantially all of the assets of the Company on a consolidated basis to an unrelated person or entity, (ii) a merger, reorganization or consolidation pursuant to which the holders of the Company’s outstanding voting power and outstanding stock immediately prior to such transaction do not own a majority of the outstanding voting power and outstanding stock or other equity interests of the resulting or successor entity (or its ultimate parent, if applicable) immediately upon completion of such transaction, (iii) the sale of all of the Stock of the Company to an unrelated person, entity or group thereof acting in concert, or (iv) any other transaction in which the owners of the Company’s outstanding voting power immediately prior to such transaction do not own at least a majority of the outstanding voting power of the Company or any successor entity immediately upon completion of the transaction other than as a result of the acquisition of securities directly from the Company (for the avoidance of doubt, any change in majority voting power resulting from the conversion of Series B Common Stock to Series A Common Stock by an individual stockholder shall not, on its own, constitute a Sale Event).
“Sale Price” means the value as determined by the Administrator of the consideration payable, or otherwise to be received by stockholders, per share of Stock pursuant to a Sale Event.
“Section 409A” means Section 409A of the Code and the regulations and other guidance promulgated thereunder.
“Series B Common Stock” means the Series B Common Stock, par value $0.001 per share, of the Company.
“Service Relationship” means any relationship as an employee, director or Consultant of the Company or any Affiliate (e.g., a Service Relationship shall be deemed to continue without interruption in the event an individual’s status changes from full-time employee to part-time employee or Consultant).
“Stock” or “Series A Common Stock” means the Series A Common Stock, par value $0.001 per share, of the Company, subject to adjustments pursuant to Section 3.
“Stock Appreciation Right” means an Award entitling the recipient to receive shares of Stock (or cash, to the extent explicitly provided for in the applicable Award Agreement) having a value equal to the excess of the Fair Market Value of the Stock on the date of exercise over the exercise price of the Stock Appreciation Right multiplied by the number of shares of Stock with respect to which the Stock Appreciation Right shall have been exercised.
“Subsidiary” means any corporation or other entity (other than the Company) in which the Company has at least a 50 percent interest, either directly or indirectly.
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"Tax-Related Items” means any income tax, social insurance, payroll tax, fringe benefit tax, payment on account or other tax-related items arising out of or in relation to an individual's participation in the Plan and legally applicable or deemed applicable to the individual.
“Ten Percent Owner” means an employee who owns or is deemed to own (by reason of the attribution rules of Section 424(d) of the Code) more than 10 percent of the combined voting power of all classes of stock of the Company or any parent or subsidiary corporation.
“Unrestricted Stock Award” means an Award of shares of Stock free of any restrictions.
SECTION 2. ADMINISTRATION OF PLAN; ADMINISTRATOR AUTHORITY TO SELECT GRANTEES AND DETERMINE AWARDS
(a) Administration of Plan. The Plan shall be administered by the Administrator.
(b) Powers of Administrator. The Administrator shall have the power and authority to grant Awards consistent with the terms of the Plan, including the power and authority:
(i) to select the individuals to whom Awards may from time to time be granted;
(ii) to determine the time or times of grant, and the extent, if any, of Incentive Stock Options, Non-Qualified Stock Options, Stock Appreciation Rights, Restricted Stock Awards, Restricted Stock Units, Unrestricted Stock Awards, Cash-Based Awards, and Dividend Equivalent Rights, or any combination of the foregoing, granted to any one or more grantees;
(iii) to determine the number of shares of Stock to be covered by any Award;
(iv) to determine and modify from time to time the terms and conditions, including restrictions, not inconsistent with the terms of the Plan, of any Award, which terms and conditions may differ among individual Awards and grantees, and to approve the forms of Award Agreements;
(v) to accelerate at any time the exercisability or vesting of all or any portion of any Award;
(vi) subject to the provisions of Section 5(c), to extend at any time the period in which Stock Options may be exercised; and
(vii) at any time to adopt, alter and repeal such rules, guidelines and practices for administration of the Plan and for its own acts and proceedings as it shall deem advisable; to interpret the terms and provisions of the Plan and any Award (including related written instruments); to make all determinations it deems advisable for the administration of the Plan; to
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decide all disputes arising in connection with the Plan; and to otherwise supervise the administration of the Plan.
All decisions and interpretations of the Administrator shall be binding on all persons, including the Company and Plan grantees.
(c) Delegation of Authority to Grant Awards. Subject to applicable law, the Administrator, in its discretion, may delegate to a committee consisting of one or more officers of the Company, including the Chief Executive Officer of the Company, all or part of the Administrator’s authority and duties with respect to the granting of Awards to individuals who are (i) not subject to the reporting and other provisions of Section 16 of the Exchange Act and (ii) not members of the delegated committee. Any such delegation by the Administrator shall include a limitation as to the amount of Stock underlying Awards that may be granted during the period of the delegation and shall contain guidelines as to the determination of the exercise price and the vesting criteria. The Administrator may revoke or amend the terms of a delegation at any time but such action shall not invalidate any prior actions of the Administrator’s delegate or delegates that were consistent with the terms of the Plan.
(d) Award Agreement. Awards under the Plan shall be evidenced by Award Agreements that set forth the terms, conditions and limitations for each Award which may include, without limitation, the term of an Award and the provisions applicable in the event the Service Relationship terminates.
(e) Indemnification. Neither the Board nor the Administrator, nor any member of either or any delegate thereof, shall be liable for any act, omission, interpretation, construction or determination made in good faith in connection with the Plan, and the members of the Board and the Administrator (and any delegate thereof) shall be entitled in all cases to indemnification and reimbursement by the Company in respect of any claim, loss, damage or expense (including, without limitation, reasonable attorneys’ fees) arising or resulting therefrom to the fullest extent permitted by law and/or under the Company’s articles or bylaws or any directors’ and officers’ liability insurance coverage which may be in effect from time to time and/or any indemnification agreement between such individual and the Company.
(f) Non-U.S. Award Recipients. Notwithstanding any provision of the Plan to the contrary, in order to comply with or facilitate compliance with the laws in other countries in which the Company and its Affiliates operate or have employees or other individuals eligible for Awards, the Administrator, in its sole discretion, shall have the power and authority to: (i) determine which Affiliates shall be covered by the Plan; (ii) determine which individuals outside the United States are eligible to participate in the Plan; (iii) modify the terms and conditions of any Award granted to individuals outside the United States to comply with applicable laws; (iv) establish subplans and modify exercise procedures and other terms and procedures, to the extent the Administrator determines such actions to be necessary or advisable (and such subplans and/or modifications may be attached to this Plan as appendices); provided, however, that no such subplans and/or modifications shall increase the share limitations contained in Section 3(a) hereof; and (v) take any action, before or after an Award is made, that the Administrator determines to be necessary or advisable to obtain approval or comply with any local
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governmental regulatory exemptions or approvals. Notwithstanding the foregoing, the Administrator may not take any actions hereunder, and no Awards shall be granted, that would violate the Exchange Act or any other applicable United States securities law, the Code, or any other applicable United States governing statute or law.
SECTION 3. STOCK ISSUABLE UNDER THE PLAN; MERGERS; SUBSTITUTION
(a) Stock Issuable. The maximum number of shares of Stock reserved and available for issuance under the Plan shall be the sum of (x) 40,300,000 shares plus (y) such additional shares as is necessary to be reserved under the Plan to underly any Awards to be granted effective as of the Registration Date (the “Initial Limit”), plus on January 1, 2024 and on each January 1 thereafter, the number of shares of Stock reserved and available for issuance under the Plan shall be cumulatively increased by five percent (5%) of the number of shares of Series A Common Stock and Series B Common Stock issued and outstanding on the immediately preceding December 31, or such lesser number of shares as approved by the Administrator, in all cases, subject to adjustment as provided in this Section 3 (the “Annual Increase”). Subject to such overall limitation, the maximum aggregate number of shares of Stock that may be issued in the form of Incentive Stock Options shall not exceed the Initial Limit cumulatively increased on January 1, 2024 and on each January 1 thereafter by the lesser of the Annual Increase for such year or 41,856,256 shares of Stock, subject in all cases to adjustment as provided in Section 3. For purposes of this limitation, the shares of Stock underlying any Awards under the Plan and the shares of Series B Stock underlying any awards under the Company’s 2015 Stock Incentive Plan that are forfeited, canceled, held back upon exercise of an Option or settlement of an Award to cover the exercise price or withholding obligations or rights for Tax-Related Items, reacquired by the Company prior to vesting, satisfied without the issuance of Stock or otherwise terminated (other than by exercise) shall be added back to the shares of Stock available for issuance under the Plan (provided, that any such shares of Series B Common Stock shall first be converted to shares of Series A Common Stock) and, to the extent permitted under Section 422 of the Code and the regulations promulgated thereunder, the shares of Stock that may be issued as Incentive Stock Options. In the event the Company repurchases shares of Stock on the open market, such shares shall not be added to the shares of Stock available for issuance under the Plan. Subject to such overall limitations, shares of Stock may be issued up to such maximum number pursuant to any type or types of Award; provided, however, that no more than 418,562,560 shares of the Stock may be issued in the form of Incentive Stock Options. The shares available for issuance under the Plan may be authorized but unissued shares of Stock or shares of Stock reacquired by the Company.
(b) Changes in Stock. Subject to Section 3(c) hereof, if, as a result of any reorganization, recapitalization, reclassification, stock dividend, stock split, reverse stock split or other similar change in the Company’s capital stock, the outstanding shares of Stock are increased or decreased or are exchanged for a different number or kind of shares or other securities of the Company, or additional shares or new or different shares or other securities of the Company or other non-cash assets are distributed with respect to such shares of Stock or other securities, or, if, as a result of any merger or consolidation, sale of all or substantially all of the assets of the Company, the outstanding shares of Stock are converted into or exchanged for
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securities of the Company or any successor entity (or a parent or subsidiary thereof), the Administrator shall make an appropriate or proportionate adjustment in (i) the maximum number of shares reserved for issuance under the Plan, including the maximum number of shares that may be issued in the form of Incentive Stock Options, (ii) the number and kind of shares or other securities subject to any then outstanding Awards under the Plan, (iii) the repurchase price, if any, per share subject to each outstanding Restricted Stock Award, and (iv) the exercise price for each share subject to any then outstanding Stock Options and Stock Appreciation Rights under the Plan, without changing the aggregate exercise price (i.e., the exercise price multiplied by the number of shares subject to Stock Options and Stock Appreciation Rights) as to which such Stock Options and Stock Appreciation Rights remain exercisable. The Administrator shall also make equitable or proportionate adjustments in the number of shares subject to outstanding Awards and the exercise price and the terms of outstanding Awards to take into consideration cash dividends paid other than in the ordinary course or any other extraordinary corporate event. The adjustment by the Administrator shall be final, binding and conclusive. No fractional shares of Stock shall be issued under the Plan resulting from any such adjustment, but the Administrator in its discretion may make a cash payment in lieu of fractional shares.
(c) Mergers and Other Transactions. In the case of and subject to the consummation of a Sale Event, the parties thereto may cause the assumption or continuation of Awards theretofore granted by the successor entity, or the substitution of such Awards with new Awards of the successor entity or parent thereof, with appropriate adjustment as to the number and kind of shares and, if appropriate, the per share exercise prices, as such parties shall agree. To the extent the parties to such Sale Event do not provide for the assumption, continuation or substitution of Awards, upon the effective time of the Sale Event, the Plan and all outstanding Awards granted hereunder shall terminate. In such case, except as may be otherwise provided in the relevant Award Agreement, all Options and Stock Appreciation Rights with time-based vesting conditions or restrictions that are not vested and/or exercisable immediately prior to the effective time of the Sale Event shall become fully vested and exercisable as of the effective time of the Sale Event, all other Awards with time-based vesting, conditions or restrictions shall become fully vested and nonforfeitable as of the effective time of the Sale Event, and all Awards with conditions and restrictions relating to the attainment of performance goals may become vested and nonforfeitable in connection with a Sale Event in the Administrator’s discretion or to the extent specified in the relevant Award Agreement. In the event of such termination, (i) the Company shall have the option (in its sole discretion) to make or provide for a payment, in cash or in kind, to the grantees holding Options and Stock Appreciation Rights, in exchange for the cancellation thereof, in an amount equal to the difference between (A) the Sale Price multiplied by the number of shares of Stock subject to outstanding Options and Stock Appreciation Rights (to the extent then exercisable at prices not in excess of the Sale Price) and (B) the aggregate exercise price of all such outstanding Options and Stock Appreciation Rights (provided that, in the case of an Option or Stock Appreciation Right with an exercise price equal to or greater than the Sale Price, such Option or Stock Appreciation Right shall be cancelled for no consideration); or (ii) each grantee shall be permitted, within a specified period of time prior to the consummation of the Sale Event as determined by the Administrator, to exercise all outstanding Options and Stock Appreciation Rights (to the extent then exercisable) held by such grantee. The Company shall also have the option (in its sole discretion) to make or provide for a payment,
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in cash or in kind, to the grantees holding other Awards in an amount equal to the Sale Price multiplied by the number of vested shares of Stock under such Awards.
(d) Maximum Awards to Non-Employee Directors. Notwithstanding anything to the contrary in this Plan, the value of all Awards awarded under this Plan and all other cash compensation paid by the Company to any Non-Employee Director in any calendar year for services as a Non-Employee Director shall not exceed (i) $1,000,000 in the first calendar year an individual becomes a Non-Employee Director and (ii) $750,000 in any other calendar year For the purpose of this limitation, the value of any Award shall be its grant date fair value, as determined in accordance with ASC 718 or successor provision but excluding the impact of estimated forfeitures related to service-based vesting provisions.
SECTION 4. ELIGIBILITY
Grantees under the Plan will be such employees, Non-Employee Directors or Consultants of the Company and its Affiliates as are selected from time to time by the Administrator in its sole discretion; provided that Awards may not be granted to employees, Directors or Consultants who are providing services only to any “parent” of the Company, as such term is defined in Rule 405 of the Act, unless (i) the stock underlying the Awards is treated as “service recipient stock” under Section 409A or (ii) the Company has determined that such Awards are exempt from or otherwise comply with Section 409A.
SECTION 5. STOCK OPTIONS
(a) Award of Stock Options. The Administrator may grant Stock Options under the Plan. Any Stock Option granted under the Plan shall be in such form as the Administrator may from time to time approve.
Stock Options granted under the Plan may be either Incentive Stock Options or Non-Qualified Stock Options. Incentive Stock Options may be granted only to employees of the Company or any Subsidiary that is a “subsidiary corporation” within the meaning of Section 424(f) of the Code. To the extent that any Option does not qualify as an Incentive Stock Option, it shall be deemed a Non-Qualified Stock Option.
Stock Options granted pursuant to this Section 5 shall be subject to the following terms and conditions and shall contain such additional terms and conditions, not inconsistent with the terms of the Plan, as the Administrator shall deem desirable. If the Administrator so determines, Stock Options may be granted in lieu of cash compensation at the optionee’s election, subject to such terms and conditions as the Administrator may establish.
(b) Exercise Price. The exercise price per share for the Stock covered by a Stock Option granted pursuant to this Section 5 shall be determined by the Administrator at the time of grant but shall not be less than 100 percent of the Fair Market Value on the date of grant. In the case of an Incentive Stock Option that is granted to a Ten Percent Owner, the exercise price of such Incentive Stock Option shall be not less than 110 percent of the Fair Market Value on the grant date. Notwithstanding the foregoing, Stock Options may be granted with an exercise price
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per share that is less than 100 percent of the Fair Market Value on the date of grant (i) pursuant to a transaction described in, and in a manner consistent with, Section 424(a) of the Code, (ii) to individuals who are not subject to U.S. income tax on the date of grant or (iii) the Stock Option is otherwise compliant with Section 409A.
(c) Option Term. The term of each Stock Option shall be fixed by the Administrator, but no Stock Option shall be exercisable more than ten years after the date the Stock Option is granted. In the case of an Incentive Stock Option that is granted to a Ten Percent Owner, the term of such Stock Option shall be no more than five years from the date of grant.
(d) Exercisability; Rights of a Stockholder. Stock Options shall become exercisable at such time or times, whether or not in installments, as shall be determined by the Administrator at or after the grant date. The Administrator may at any time accelerate the exercisability of all or any portion of any Stock Option. An optionee shall have the rights of a stockholder only as to shares acquired upon the exercise of a Stock Option and not as to unexercised Stock Options.
(e) Method of Exercise. Stock Options may be exercised in whole or in part, by giving written or electronic notice of exercise to the Company, specifying the number of shares to be purchased. Payment of the purchase price may be made by one or more of the following methods except to the extent otherwise provided in the Award Agreement:
(i) In cash, by certified or bank check or other instrument acceptable to the Administrator;
(ii) Through the delivery (or attestation to the ownership following such procedures as the Company may prescribe) of shares of Stock that are not then subject to restrictions under any Company plan. Such surrendered shares shall be valued at Fair Market Value on the exercise date;
(iii) By the optionee delivering to the Company a properly executed exercise notice together with irrevocable instructions to a broker to promptly deliver to the Company cash or a check payable and acceptable to the Company for the purchase price; provided that in the event the optionee chooses to pay the purchase price as so provided, the optionee and the broker shall comply with such procedures and enter into such agreements of indemnity and other agreements as the Company shall prescribe as a condition of such payment procedure; or
(iv) With respect to Stock Options that are not Incentive Stock Options, by a “net exercise” arrangement pursuant to which the Company will reduce the number of shares of Stock issuable upon exercise by the largest whole number of shares with a Fair Market Value that does not exceed the aggregate exercise price.
Payment instruments will be received subject to collection. The transfer to the optionee on the records of the Company or of the transfer agent of the shares of Stock to be purchased pursuant to the exercise of a Stock Option will be contingent upon receipt from the optionee (or a purchaser acting in their stead in accordance with the provisions of the Stock Option) by the Company of the full purchase price for such shares and the fulfillment of any other requirements
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contained in the Award Agreement or applicable provisions of laws (including the satisfaction of any withholding obligations or rights for Tax-Related Items with respect to the optionee). In the event an optionee chooses to pay the purchase price by previously-owned shares of Stock through the attestation method, the number of shares of Stock transferred to the optionee upon the exercise of the Stock Option shall be net of the number of attested shares. In the event that the Company establishes, for itself or using the services of a third party, an automated system for the exercise of Stock Options, such as a system using an internet website or interactive voice response, then the paperless exercise of Stock Options may be permitted through the use of such an automated system.
(f) Annual Limit on Incentive Stock Options. To the extent required for “incentive stock option” treatment under Section 422 of the Code, the aggregate Fair Market Value (determined as of the time of grant) of the shares of Stock with respect to which Incentive Stock Options granted under this Plan and any other plan of the Company or its parent and subsidiary corporations become exercisable for the first time by an optionee during any calendar year shall not exceed $100,000. To the extent that any Stock Option exceeds this limit, it shall constitute a Non-Qualified Stock Option.
SECTION 6. STOCK APPRECIATION RIGHTS
(a) Award of Stock Appreciation Rights. The Administrator may grant Stock Appreciation Rights under the Plan. A Stock Appreciation Right is an Award entitling the recipient to receive shares of Stock (or cash, to the extent explicitly provided for in the applicable Award Agreement) having a value equal to the excess of the Fair Market Value of a share of Stock on the date of exercise over the exercise price of the Stock Appreciation Right multiplied by the number of shares of Stock with respect to which the Stock Appreciation Right shall have been exercised.
(b) Exercise Price of Stock Appreciation Rights. The exercise price of a Stock Appreciation Right shall not be less than 100 percent of the Fair Market Value of the Stock on the date of grant.
(c) Grant and Exercise of Stock Appreciation Rights. Stock Appreciation Rights may be granted by the Administrator independently of any Stock Option granted pursuant to Section 5 of the Plan.
(d) Terms and Conditions of Stock Appreciation Rights. Stock Appreciation Rights shall be subject to such terms and conditions as shall be determined on the date of grant by the Administrator. The term of a Stock Appreciation Right may not exceed ten years. The terms and conditions of each such Award shall be determined by the Administrator, and such terms and conditions may differ among individual Awards and grantees.
SECTION 7. RESTRICTED STOCK AWARDS
(a) Nature of Restricted Stock Awards. The Administrator may grant Restricted Stock Awards under the Plan. A Restricted Stock Award is any Award of Restricted Shares
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subject to such restrictions and conditions as the Administrator may determine at the time of grant. Conditions may be based on continuing employment (or other Service Relationship) and/or achievement of pre-established performance goals and objectives.
(b) Rights as a Stockholder. Upon the grant of the Restricted Stock Award and payment of any applicable purchase price, a grantee shall have the rights of a stockholder with respect to the voting of the Restricted Shares and receipt of dividends; provided that if the lapse of restrictions with respect to the Restricted Stock Award is tied to the attainment of performance goals, any dividends paid by the Company during the performance period shall accrue and shall not be paid to the grantee until and to the extent the performance goals are met with respect to the Restricted Stock Award. Unless the Administrator shall otherwise determine, (i) uncertificated Restricted Shares shall be accompanied by a notation on the records of the Company or the transfer agent to the effect that they are subject to forfeiture until such Restricted Shares are vested as provided in Section 7(d) below, and (ii) certificated Restricted Shares shall remain in the possession of the Company until such Restricted Shares are vested as provided in Section 7(d) below, and the grantee shall be required, as a condition of the grant, to deliver to the Company such instruments of transfer as the Administrator may prescribe.
(c) Restrictions. Restricted Shares may not be sold, assigned, transferred, pledged or otherwise encumbered or disposed of except as specifically provided herein or in the Restricted Stock Award Agreement. Except as may otherwise be provided by the Administrator either in the Award Agreement or, subject to Section 16 below, in writing after the Award is issued, if a grantee’s employment (or other Service Relationship) with the Company and its Affiliates terminates for any reason, any Restricted Shares that have not vested at the time of termination shall automatically and without any requirement of notice to such grantee from or other action by or on behalf of, the Company be deemed to have been reacquired by the Company at its original purchase price (if any) from such grantee or such grantee’s legal representative simultaneously with such termination of employment (or other Service Relationship), and thereafter shall cease to represent any ownership of the Company by the grantee or rights of the grantee as a stockholder. Following such deemed reacquisition of Restricted Shares that are represented by physical certificates, a grantee shall surrender such certificates to the Company upon request without consideration.
(d) Vesting of Restricted Shares. The Administrator at the time of grant shall specify the date or dates and/or the attainment of pre-established performance goals, objectives and other conditions on which the non-transferability of the Restricted Shares and the Company’s right of repurchase or forfeiture shall lapse. Subsequent to such date or dates and/or the attainment of such pre-established performance goals, objectives and other conditions, the shares on which all restrictions have lapsed shall no longer be Restricted Shares and shall be deemed “vested.”
SECTION 8. RESTRICTED STOCK UNITS
(a) Nature of Restricted Stock Units. The Administrator may grant Restricted Stock Units under the Plan. A Restricted Stock Unit is an Award of stock units that may be settled in shares of Stock (or cash, to the extent explicitly provided for in the Award Agreement) upon the satisfaction of such restrictions and conditions at the time of grant. Conditions may be based on
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continuing employment (or other Service Relationship) and/or achievement of pre-established performance goals and objectives. The terms and conditions of each such Award shall be determined by the Administrator, and such terms and conditions may differ among individual Awards and grantees. Except in the case of Restricted Stock Units with a deferred settlement date that complies with Section 409A, at the end of the vesting period, the Restricted Stock Units, to the extent vested, shall be settled in the form of shares of Stock. Restricted Stock Units with deferred settlement dates are subject to Section 409A and shall contain such additional terms and conditions as the Administrator shall determine in its sole discretion in order to comply with the requirements of Section 409A.
(b) Election to Receive Restricted Stock Units in Lieu of Compensation. The Administrator may, in its sole discretion, permit a grantee to elect to receive a portion of future cash compensation otherwise due to such grantee in the form of an award of Restricted Stock Units. Any such election shall be made in writing and shall be delivered to the Company no later than the date specified by the Administrator and in accordance with Section 409A and such other rules and procedures established by the Administrator. Any such future cash compensation that the grantee elects to defer shall be converted to a fixed number of Restricted Stock Units based on the Fair Market Value of Stock on the date the compensation would otherwise have been paid to the grantee if such payment had not been deferred as provided herein. The Administrator shall have the sole right to determine whether and under what circumstances to permit such elections and to impose such limitations and other terms and conditions thereon as the Administrator deems appropriate. Any Restricted Stock Units that are elected to be received in lieu of cash compensation shall be fully vested, unless otherwise provided in the Award Agreement.
(c) Rights as a Stockholder. A grantee shall have the rights as a stockholder only as to shares of Stock acquired by the grantee upon settlement of Restricted Stock Units; provided, however, that the grantee may be credited with Dividend Equivalent Rights with respect to the stock units underlying their Restricted Stock Units, subject to the provisions of Section 11 and such terms and conditions as the Administrator may determine.
(d) Termination. Except as may otherwise be provided by the Administrator either in the Award Agreement or, subject to Section 16 below, in writing after the Award is issued, a grantee’s right in all Restricted Stock Units that have not vested shall automatically terminate upon the grantee’s termination of employment (or cessation of other Service Relationship) with the Company and its Affiliates for any reason.
SECTION 9. UNRESTRICTED STOCK AWARDS
Grant or Sale of Unrestricted Stock. The Administrator may grant (or sell at par value or such higher purchase price determined by the Administrator) an Unrestricted Stock Award under the Plan. An Unrestricted Stock Award is an Award pursuant to which the grantee may receive shares of Stock free of any restrictions under the Plan. Unrestricted Stock Awards may be granted in respect of past services or other valid consideration, or in lieu of cash compensation due to such grantee.
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SECTION 10. CASH-BASED AWARDS
Grant of Cash-Based Awards. The Administrator may grant Cash-Based Awards under the Plan. A Cash-Based Award is an Award that entitles the grantee to a payment in cash upon the attainment of specified performance goals. The Administrator shall determine the maximum duration of the Cash-Based Award, the amount of cash to which the Cash-Based Award pertains, the conditions upon which the Cash-Based Award shall become vested or payable, and such other provisions as the Administrator shall determine. Each Cash-Based Award shall specify a cash-denominated payment amount, formula or payment ranges as determined by the Administrator. Payment, if any, with respect to a Cash-Based Award shall be made in accordance with the terms of the Award and may be made in cash.
SECTION 11. DIVIDEND EQUIVALENT RIGHTS
(a) Dividend Equivalent Rights. The Administrator may grant Dividend Equivalent Rights under the Plan. A Dividend Equivalent Right is an Award entitling the grantee to receive credits based on cash dividends that would have been paid on the shares of Stock specified in the Dividend Equivalent Right (or other Award to which it relates) if such shares had been issued to the grantee. A Dividend Equivalent Right may be granted hereunder to any grantee as a component of an award of Restricted Stock Units or as a freestanding award. The terms and conditions of Dividend Equivalent Rights shall be specified in the Award Agreement. Dividend equivalents credited to the holder of a Dividend Equivalent Right may be paid currently or may be deemed to be reinvested in additional shares of Stock, which may thereafter accrue additional equivalents. Any such reinvestment shall be at Fair Market Value on the date of reinvestment or such other price as may then apply under a dividend reinvestment plan sponsored by the Company, if any. Dividend Equivalent Rights may be settled in cash or shares of Stock or a combination thereof, in a single installment or installments. A Dividend Equivalent Right granted as a component of an Award of Restricted Stock Units shall provide that such Dividend Equivalent Right shall be settled only upon settlement or payment of, or lapse of restrictions on, such other Award, and that such Dividend Equivalent Right shall expire or be forfeited or annulled under the same conditions as such other Award.
(b) Termination. Except as may otherwise be provided by the Administrator either in the Award Agreement or, subject to Section 16 below, in writing after the Award is issued, a grantee’s rights in all Dividend Equivalent Rights shall automatically terminate upon the grantee’s termination of employment (or cessation of other Service Relationship) with the Company and its Affiliates for any reason.
SECTION 12. TRANSFERABILITY OF AWARDS
(a) Transferability. Except as provided in Section 12(b) below, during a grantee’s lifetime, their Awards shall be exercisable only by the grantee, or by the grantee’s legal representative or guardian in the event of the grantee’s incapacity. No Awards shall be sold, assigned, transferred or otherwise encumbered or disposed of by a grantee other than by will or by the laws of descent and distribution. No Awards shall be subject, in whole or in part, to
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attachment, execution, or levy of any kind, and any purported transfer in violation hereof shall be null and void.
(b) Administrator Action. Notwithstanding Section 12(a), the Administrator, in its discretion, may provide either in the Award Agreement regarding a given Award or by subsequent written approval that the grantee (who is an employee or Non-Employee Director) may transfer their Non-Qualified Stock Options to their immediate family members, to trusts for the benefit of such family members, or to partnerships in which such family members are the only partners, provided that the transferee agrees in writing with the Company to be bound by all of the terms and conditions of this Plan and the applicable Award Agreement. In no event may an Award be transferred by a grantee for value.
(c) Family Member. For purposes of Section 12(b), “family member” shall mean a grantee’s child, stepchild, grandchild, parent, stepparent, grandparent, spouse, former spouse, sibling, niece, nephew, mother-in-law, father-in-law, son-in-law, daughter-in-law, brother-in-law, or sister-in-law, including adoptive relationships, any person sharing the grantee’s household (other than a tenant of the grantee), a trust in which these persons (or the grantee) have more than 50 percent of the beneficial interest, a foundation in which these persons (or the grantee) control the management of assets, and any other entity in which these persons (or the grantee) own more than 50 percent of the voting interests.
(d) Designation of Beneficiary. To the extent permitted by the Company and valid under applicable law, each grantee to whom an Award has been made under the Plan may designate a beneficiary or beneficiaries to exercise any Award or receive any payment under any Award payable on or after the grantee’s death. Any such designation shall be on a form provided for that purpose by the Administrator and shall not be effective until received by the Administrator. If no beneficiary has been designated by a deceased grantee, if a designation is not valid under applicable law, or if the designated beneficiaries have predeceased the grantee, the beneficiary shall be the grantee’s estate or legal heirs.
SECTION 13. TAX WITHHOLDING
(a) Payment by Grantee. Each grantee shall, no later than the date as of which the value of an Award or of any Stock or other amounts received thereunder first becomes includable in the income of the grantee for tax purposes, pay to the Company, or make arrangements satisfactory to the Administrator regarding payment of, any Tax-Related Items that the Company or any Affiliate is required or otherwise entitled to withhold with respect to such income. The Company and its Affiliates shall, to the extent permitted by law, have the right to deduct any such taxes from any payment of any kind otherwise due to the grantee. The Company’s obligation to deliver evidence of book entry (or stock certificates) to any grantee is subject to and conditioned on withholding obligations or rights for Tax-Related Items being satisfied by the grantee.
(b) Payment in Stock. The Administrator may require or permit the Company’s or an Affiliate's withholding obligation or right for Tax-Related Items to be satisfied, in whole or in part, by the Company withholding from shares of Stock to be issued pursuant to any Award a
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number of shares with an aggregate Fair Market Value (as of the date the withholding is effected) that would satisfy the withholding amount due; provided, however, that the amount withheld does not exceed the maximum statutory tax rate or such lesser amount as is necessary to avoid liability accounting treatment. For purposes of share withholding, the Fair Market Value of withheld shares shall be determined in the same manner as the value of Stock includible in income of the grantees. The Administrator may also require or permit the Company’s or an Affiliate's withholding obligation or right to be satisfied, in whole or in part, by an arrangement whereby a certain number of shares of Stock issued pursuant to any Award are immediately sold and proceeds from such sale are remitted to the Company in an amount that would satisfy the withholding amount due.
SECTION 14. SECTION 409A AWARDS
Awards are intended to be exempt from Section 409A to the greatest extent possible and to otherwise comply with Section 409A. The Plan and all Awards shall be interpreted in accordance with such intent. To the extent that any Award is determined to constitute “nonqualified deferred compensation” within the meaning of Section 409A (a “409A Award”), the Award shall be subject to such additional rules and requirements as specified by the Administrator from time to time in order to comply with Section 409A. In this regard, if any amount under a 409A Award is payable upon a “separation from service” (within the meaning of Section 409A) to a grantee who is then considered a “specified employee” (within the meaning of Section 409A), then no such payment shall be made prior to the date that is the earlier of (i) six months and one day after the grantee’s separation from service, or (ii) the grantee’s death, but only to the extent such delay is necessary to prevent such payment from being subject to interest, penalties and/or additional tax imposed pursuant to Section 409A. Further, the settlement of any 409A Award may not be accelerated except to the extent permitted by Section 409A.
SECTION 15. TERMINATION OF SERVICE RELATIONSHIP, TRANSFER, LEAVE OF ABSENCE, ETC.
(a) Termination of Service Relationship. If the grantee’s Service Relationship is with an Affiliate and such Affiliate ceases to be an Affiliate, the grantee shall be deemed to have terminated their Service Relationship for purposes of the Plan.
(b) For purposes of the Plan, the following events shall not be deemed a termination of a Service Relationship:
(i) a transfer to the employment or other service of the Company from an Affiliate or from the Company to an Affiliate, or from one Affiliate to another; or
(ii) an approved leave of absence for military service or sickness, or for any other purpose approved by the Company, if the employee’s right to re-employment is guaranteed either by a statute or by contract or under the policy pursuant to which the leave of absence was granted or if the Administrator otherwise so provides in writing.
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SECTION 16. AMENDMENTS AND TERMINATION
The Board may, at any time, amend or discontinue the Plan and the Administrator may, at any time, amend or cancel any outstanding Award for the purpose of satisfying changes in law or for any other lawful purpose, but no such action shall materially and adversely affect rights under any outstanding Award without the holder’s consent. The Administrator is specifically authorized to exercise its discretion to reduce the exercise price of outstanding Stock Options or Stock Appreciation Rights or effect the repricing of such Awards through cancellation and re-grants.. To the extent required under the rules of any securities exchange or market system on which the Stock is listed, to the extent determined by the Administrator to be required by the Code to ensure that Incentive Stock Options granted under the Plan are qualified under Section 422 of the Code, Plan amendments shall be subject to approval by Company stockholders. Nothing in this Section 16 shall limit the Administrator’s authority to take any action permitted pursuant to Section 3(b) or 3(c).
SECTION 17. STATUS OF PLAN
With respect to the portion of any Award that has not been exercised and any payments in cash, Stock or other consideration not received by a grantee, a grantee shall have no rights greater than those of a general creditor of the Company unless the Administrator shall otherwise expressly determine in connection with any Award or Awards. In its sole discretion, the Administrator may authorize the creation of trusts or other arrangements to meet the Company’s obligations to deliver Stock or make payments with respect to Awards hereunder, provided that the existence of such trusts or other arrangements is consistent with the foregoing sentence.
SECTION 18. GENERAL PROVISIONS
(a) No Distribution. The Administrator may require each person acquiring Stock pursuant to an Award to represent to and agree with the Company in writing that such person is acquiring the shares without a view to distribution thereof.
(b) Issuance of Stock. To the extent certificated, stock certificates to grantees under this Plan shall be deemed delivered for all purposes when the Company or a stock transfer agent of the Company shall have mailed such certificates in the United States mail, addressed to the grantee, at the grantee’s last known address on file with the Company. Uncertificated Stock shall be deemed delivered for all purposes when the Company or a Stock transfer agent of the Company shall have given to the grantee by electronic mail (with proof of receipt) or by United States mail, addressed to the grantee, at the grantee’s last known address on file with the Company, notice of issuance and recorded the issuance in its records (which may include electronic “book entry” records). Notwithstanding anything herein to the contrary, the Company shall not be required to issue or deliver any evidence of book entry or certificates evidencing shares of Stock pursuant to the exercise or settlement of any Award, unless and until the Administrator has determined, with advice of counsel (to the extent the Administrator deems such advice necessary or advisable), that the issuance and delivery is in compliance with all applicable laws, regulations of governmental authorities and, if applicable, the requirements of any exchange on which the shares of Stock are listed, quoted or traded. Any Stock issued
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pursuant to the Plan shall be subject to any stop-transfer orders and other restrictions as the Administrator deems necessary or advisable to comply with federal, state or foreign jurisdiction, securities or other laws, rules and quotation system on which the Stock is listed, quoted or traded. The Administrator may place legends on any Stock certificate or notations on any book entry to reference restrictions applicable to the Stock. In addition to the terms and conditions provided herein, the Administrator may require that an individual make such reasonable covenants, agreements, and representations as the Administrator, in its discretion, deems necessary or advisable in order to comply with any such laws, regulations, or requirements. The Administrator shall have the right to require any individual to comply with any timing or other restrictions with respect to the settlement or exercise of any Award, including a window-period limitation, as may be imposed in the discretion of the Administrator.
(c) Stockholder Rights. Until Stock is deemed delivered in accordance with Section 18(b), no right to vote or receive dividends or any other rights of a stockholder will exist with respect to shares of Stock to be issued in connection with an Award, notwithstanding the exercise of a Stock Option or any other action by the grantee with respect to an Award.
(d) Other Incentive Arrangements; No Rights to Continued Service Relationship. Nothing contained in this Plan shall prevent the Board from adopting other or additional incentive arrangements, including trusts, and such arrangements may be either generally applicable or applicable only in specific cases. The adoption of this Plan and the grant of Awards do not confer upon any employee any right to continued employment or other Service Relationship with the Company or any Affiliate.
(e) Trading Policy Restrictions. Option exercises and other Awards under the Plan shall be subject to the Company’s insider trading policies and procedures, as in effect from time to time.
(f) Clawback Policy. Awards under the Plan shall be subject to the Company’s clawback policy, as in effect from time to time, including without limitation, any policy adopted to comply with Section 19(b)(1) of the Exchange Act and Rule 19b-4 thereunder, and Section 303A.14 of the NYSE Listed Company Manual (and any successor thereto).
SECTION 19. EFFECTIVE DATE OF PLAN
This Plan shall become effective upon the date immediately preceding the Registration Date subject to prior stockholder approval in accordance with applicable state law, the Company’s bylaws and articles of incorporation, and applicable stock exchange rules. No grants of Stock Options and other Awards may be made hereunder after the tenth anniversary of the Effective Date and no grants of Incentive Stock Options may be made hereunder after the tenth anniversary of the date the Plan is approved by the Board.
SECTION 20. GOVERNING LAW
This Plan and all Awards and actions taken thereunder shall be governed by, and construed in accordance with, the General Corporation Law of the State of Delaware as to
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matters within the scope thereof, and as to all other matters shall be governed by and construed in accordance with the internal laws of the Commonwealth of Massachusetts, applied without regard to conflict of law principles.
DATE APPROVED BY BOARD OF DIRECTORS: August 24, 2023
DATE APPROVED BY STOCKHOLDERS: September 10, 2023
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INCENTIVE STOCK OPTION AGREEMENT
UNDER THE KLAVIYO, INC.
2023 STOCK OPTION AND INCENTIVE PLAN

Name of Optionee: |  |
No. of Option Shares: |  |  |
Option Exercise Price per Share: | $ |  |  |
| [FMV on Grant Date (110% of FMV if a 10% owner)]
Grant Date: |  |  |
Expiration Date: |  |  |
| [up to 10 years (5 if a 10% owner)]

Pursuant to the Klaviyo, Inc. 2023 Stock Option and Incentive Plan as amended through the date hereof (the “Plan”), Klaviyo, Inc. (the “Company”) hereby grants to the Optionee named above an option (the “Stock Option”) to purchase on or prior to the Expiration Date specified above all or part of the number of shares of Series A Common Stock, par value $0.001 per share (the “Stock”), of the Company specified above at the Option Exercise Price per Share specified above subject to the terms and conditions set forth herein and in the Plan.
1. Exercisability Schedule. No portion of this Stock Option may be exercised until such portion shall have become exercisable. Except as set forth below, and subject to the discretion of the Administrator (as defined in Section 2 of the Plan) to accelerate the exercisability schedule hereunder, this Stock Option shall be exercisable with respect to the number of Option Shares in the schedule set forth in Attachment 1 on the dates indicated so long as the Optionee continues to have a Service Relationship with the Company or a Subsidiary on such dates. Once exercisable, this Stock Option shall continue to be exercisable at any time or times prior to the close of business on the Expiration Date, subject to the provisions hereof and of the Plan.
2. Manner of Exercise.
(a) The Optionee may exercise this Stock Option only in the following manner: from time to time on or prior to the Expiration Date of this Stock Option, the Optionee may give written notice to the Administrator of his or her election to purchase some or all of the Option Shares purchasable at the time of such notice. This notice shall specify the number of Option Shares to be purchased.
Payment of the purchase price for the Option Shares may be made by one or more of the following methods: (i) in cash, by certified or bank check or other instrument acceptable to the Administrator; (ii) through the delivery (or attestation to the ownership) of shares of Stock that

have been purchased by the Optionee on the open market or that are beneficially owned by the Optionee and are not then subject to any restrictions under any Company plan and that otherwise satisfy any holding periods as may be required by the Administrator; or (iii) by the Optionee delivering to the Company a properly executed exercise notice together with irrevocable instructions to a broker to promptly deliver to the Company cash or a check payable and acceptable to the Company to pay the option purchase price, provided that in the event the Optionee chooses to pay the option purchase price as so provided, the Optionee and the broker shall comply with such procedures and enter into such agreements of indemnity and other agreements as the Administrator shall prescribe as a condition of such payment procedure; or (iv) a combination of (i), (ii) and (iii) above. Payment instruments will be received subject to collection.
The transfer to the Optionee on the records of the Company or of the transfer agent of the Option Shares will be contingent upon (i) the Company’s receipt from the Optionee of the full purchase price for the Option Shares, as set forth above, (ii) the fulfillment of any other requirements contained herein or in the Plan or in any other agreement or provision of laws, and (iii) the receipt by the Company of any agreement, statement or other evidence that the Company may require to satisfy itself that the issuance of Stock to be purchased pursuant to the exercise of Stock Options under the Plan and any subsequent resale of the shares of Stock will be in compliance with applicable laws and regulations. In the event the Optionee chooses to pay the purchase price by previously-owned shares of Stock through the attestation method, the number of shares of Stock transferred to the Optionee upon the exercise of the Stock Option shall be net of the Shares attested to.
(b) The shares of Stock purchased upon exercise of this Stock Option shall be transferred to the Optionee on the records of the Company or of the transfer agent upon compliance to the satisfaction of the Administrator with all requirements under applicable laws or regulations in connection with such transfer and with the requirements hereof and of the Plan. The determination of the Administrator as to such compliance shall be final and binding on the Optionee. The Optionee shall not be deemed to be the holder of, or to have any of the rights of a holder with respect to, any shares of Stock subject to this Stock Option unless and until this Stock Option shall have been exercised pursuant to the terms hereof, the Company or the transfer agent shall have transferred the shares to the Optionee, and the Optionee’s name shall have been entered as the stockholder of record on the books of the Company. Thereupon, the Optionee shall have full voting, dividend and other ownership rights with respect to such shares of Stock.
(c) Notwithstanding any other provision hereof or of the Plan, no portion of this Stock Option shall be exercisable after the Expiration Date hereof.
3. Termination of Service Relationship. If the Optionee’s Service Relationship with the Company or a Subsidiary (as defined in the Plan) is terminated, the period within which to exercise the Stock Option may be subject to earlier termination as set forth below.
(a) Termination Due to Death. If the Optionee’s Service Relationship with the Company or a Subsidiary terminates by reason of the Optionee’s death, any portion of this Stock Option outstanding on such date, to the extent exercisable on the date of death, may
2

thereafter be exercised by the Optionee’s legal representative or legatee for a period of 12 months from the date of death or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of death shall terminate immediately and be of no further force or effect.
(b) Termination Due to Disability. If the Optionee’s Service Relationship with the Company or a Subsidiary terminates by reason of the Optionee’s disability (as determined by the Administrator), any portion of this Stock Option outstanding on such date, to the extent exercisable on the date of such termination, may thereafter be exercised by the Optionee for a period of 12 months from the date of disability or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of disability shall terminate immediately and be of no further force or effect.
(c) Termination for Cause. If the Optionee’s Service Relationship with the Company or a Subsidiary terminates for Cause, any portion of this Stock Option outstanding on such date shall terminate immediately and be of no further force and effect. For purposes hereof, “Cause” shall mean, unless otherwise provided in an employment or service agreement between the Company and the Optionee, a determination by the Administrator that the Optionee shall be dismissed as a result of (i) any material breach by the Optionee of any agreement between the Optionee and the Company; (ii) the conviction of, indictment for or plea of nolo contendere by the Optionee to a felony or a crime involving moral turpitude; or (iii) any material misconduct or willful and deliberate non-performance (other than by reason of disability) by the Optionee of the Optionee’s duties to the Company.
(d) Other Termination. If the Optionee’s Service Relationship with the Company or a Subsidiary terminates for any reason other than the Optionee’s death, the Optionee’s disability, or Cause, and unless otherwise determined by the Administrator, any portion of this Stock Option outstanding on such date may be exercised, to the extent exercisable on the date of termination, for a period of three months from the date of termination or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of termination shall terminate immediately and be of no further force or effect.
The Administrator’s determination of the reason for termination of the Optionee’s Service Relationship with the Company or a Subsidiary shall be conclusive and binding on the Optionee and his or her representatives or legatees.
4. Incorporation of Plan. Notwithstanding anything herein to the contrary, this Stock Option shall be subject to and governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different meaning is specified herein.
5. Transferability. This Agreement is personal to the Optionee, is non-assignable and is not transferable in any manner, by operation of law or otherwise, other than by will or the laws of descent and distribution. This Stock Option is exercisable, during the Optionee’s
3

lifetime, only by the Optionee, and thereafter, only by the Optionee’s legal representative or legatee.
6. Status of the Stock Option. This Stock Option is intended to qualify as an “incentive stock option” under Section 422 of the Internal Revenue Code of 1986, as amended (the “Code”), but the Company does not represent or warrant that this Stock Option qualifies as such. The Optionee should consult with his or her own tax advisors regarding the tax effects of this Stock Option and the requirements necessary to obtain favorable income tax treatment under Section 422 of the Code, including, but not limited to, holding period requirements. To the extent any portion of this Stock Option does not so qualify as an “incentive stock option,” such portion shall be deemed to be a non-qualified stock option. If the Optionee intends to dispose or does dispose (whether by sale, gift, transfer or otherwise) of any Option Shares within the one-year period beginning on the date after the transfer of such shares to him or her, or within the two-year period beginning on the day after the grant of this Stock Option, he or she will so notify the Company within 30 days after such disposition.
7. Tax Withholding. The Optionee shall, not later than the date as of which the exercise of this Stock Option becomes a taxable event for Federal income tax purposes, pay to the Company or make arrangements satisfactory to the Administrator for payment of any Federal, state, and local taxes required by law to be withheld on account of such taxable event. T he Company shall have the authority to cause the required tax withholding amount to be satisfied, in whole or in part, by (i) withholding from shares of Stock to be issued to the Grantee a number of shares of Stock with an aggregate Fair Market Value that would satisfy the withholding amount due; or (ii) causing its transfer agent to sell from the number of shares of Stock to be issued to the Grantee, the number of shares of Stock necessary to satisfy the Federal, state and local taxes required by law to be withheld from the Grantee on account of such transfer.
8. No Obligation to Continue Service Relationship. Neither the Company nor any Subsidiary is obligated by or as a result of the Plan or this Agreement to continue the Optionee in a Service Relationship with the Company or a Subsidiary, and neither the Plan nor this Agreement shall interfere in any way with the right of the Company or any Subsidiary to terminate the Optionee’s Service Relationship with the Company or a Subsidiary at any time.
9. Integration. This Agreement constitutes the entire agreement between the parties with respect to this Stock Option and supersedes all prior agreements and discussions between the parties concerning such subject matter.
10. Data Privacy Consent. In order to administer the Plan and this Agreement and to implement or structure future equity grants, the Company, its subsidiaries and affiliates and certain agents thereof (together, the “Relevant Companies”) may process any and all personal or professional data, including but not limited to Social Security or other identification number, home address and telephone number, date of birth and other information that is necessary or desirable for the administration of the Plan and/or this Agreement (the “Relevant Information”). By entering into this Agreement, the Optionee (i) authorizes the Company to collect, process, register and transfer to the Relevant Companies all Relevant Information; (ii) waives any privacy rights the Optionee may have with respect to the Relevant Information; (iii) authorizes the
4

Relevant Companies to store and transmit such information in electronic form; and (iv) authorizes the transfer of the Relevant Information to any jurisdiction in which the Relevant Companies consider appropriate. The Optionee shall have access to, and the right to change, the Relevant Information. Relevant Information will only be used in accordance with applicable law.
11. Notices. Notices hereunder shall be mailed or delivered to the Company at its principal place of business and shall be mailed or delivered to the Optionee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing.

KLAVIYO, INC.
By: |
| Title:

The foregoing Agreement is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned. Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Optionee (including through an online acceptance process) is acceptable.

Dated: |  |  |
|  |  | Optionee’s Signature
|  |  | Optionee’s name and address:

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Attachment 1
Vesting Schedule

Incremental Number of Option Shares Exercisable* | Exercisability Date
_____________ (___%) | ____________
_____________ (___%) | ____________
_____________ (___%) | ____________
_____________ (___%) | ____________
_____________ (___%) | ____________

* Max. of $100,000 per yr.
6

NON-QUALIFIED STOCK OPTION AGREEMENT
UNDER THE KLAVIYO, INC.
2023 STOCK OPTION AND INCENTIVE PLAN

Name of Optionee: |  |
No. of Option Shares: |  |  |
Option Exercise Price per Share: | $ |  |  |
| [FMV on Grant Date] |  |
Grant Date: |  |  |
Expiration Date: |  |  |

Pursuant to the Klaviyo, Inc. 2023 Stock Option and Incentive Plan as amended through the date hereof (the “Plan”), Klaviyo, Inc. (the “Company”) hereby grants to the Optionee named above an option (the “Stock Option”) to purchase on or prior to the Expiration Date specified above all or part of the number of shares of Series A Common Stock, par value $0.001 per share (the “Stock”) of the Company specified above at the Option Exercise Price per Share specified above subject to the terms and conditions set forth herein and in the Plan. This Stock Option is not intended to be an “incentive stock option” under Section 422 of the Internal Revenue Code of 1986, as amended.
1. Exercisability Schedule. No portion of this Stock Option may be exercised until such portion shall have become exercisable. Except as set forth below, and subject to the discretion of the Administrator (as defined in Section 2 of the Plan) to accelerate the exercisability schedule hereunder, this Stock Option shall be exercisable with respect to the number of Option Shares specified in the schedule set forth in Attachment 1 on the dates indicated so long as Optionee continues to have a Service Relationship with the Company or a Subsidiary on such dates. Once exercisable, this Stock Option shall continue to be exercisable at any time or times prior to the close of business on the Expiration Date, subject to the provisions hereof and of the Plan.
2. Manner of Exercise.
(a) The Optionee may exercise this Stock Option only in the following manner: from time to time on or prior to the Expiration Date of this Stock Option, the Optionee may give written notice to the Administrator of his or her election to purchase some or all of the Option Shares purchasable at the time of such notice. This notice shall specify the number of Option Shares to be purchased.

Payment of the purchase price for the Option Shares may be made by one or more of the following methods: (i) in cash, by certified or bank check or other instrument acceptable to the Administrator; (ii) through the delivery (or attestation to the ownership) of shares of Stock that have been purchased by the Optionee on the open market or that are beneficially owned by the Optionee and are not then subject to any restrictions under any Company plan and that otherwise satisfy any holding periods as may be required by the Administrator; (iii) by the Optionee delivering to the Company a properly executed exercise notice together with irrevocable instructions to a broker to promptly deliver to the Company cash or a check payable and acceptable to the Company to pay the option purchase price, provided that in the event the Optionee chooses to pay the option purchase price as so provided, the Optionee and the broker shall comply with such procedures and enter into such agreements of indemnity and other agreements as the Administrator shall prescribe as a condition of such payment procedure; (iv) by a “net exercise” arrangement pursuant to which the Company will reduce the number of shares of Stock issuable upon exercise by the largest whole number of shares with a Fair Market Value that does not exceed the aggregate exercise price; or (v) a combination of (i), (ii), (iii) and (iv) above. Payment instruments will be received subject to collection.
The transfer to the Optionee on the records of the Company or of the transfer agent of the Option Shares will be contingent upon (i) the Company’s receipt from the Optionee of the full purchase price for the Option Shares, as set forth above, (ii) the fulfillment of any other requirements contained herein or in the Plan or in any other agreement or provision of laws, and (iii) the receipt by the Company of any agreement, statement or other evidence that the Company may require to satisfy itself that the issuance of Stock to be purchased pursuant to the exercise of Stock Options under the Plan and any subsequent resale of the shares of Stock will be in compliance with applicable laws and regulations. In the event the Optionee chooses to pay the purchase price by previously-owned shares of Stock through the attestation method, the number of shares of Stock transferred to the Optionee upon the exercise of the Stock Option shall be net of the Shares attested to.
(b) The shares of Stock purchased upon exercise of this Stock Option shall be transferred to the Optionee on the records of the Company or of the transfer agent upon compliance to the satisfaction of the Administrator with all requirements under applicable laws or regulations in connection with such transfer and with the requirements hereof and of the Plan. The determination of the Administrator as to such compliance shall be final and binding on the Optionee. The Optionee shall not be deemed to be the holder of, or to have any of the rights of a holder with respect to, any shares of Stock subject to this Stock Option unless and until this Stock Option shall have been exercised pursuant to the terms hereof, the Company or the transfer agent shall have transferred the shares to the Optionee, and the Optionee’s name shall have been entered as the stockholder of record on the books of the Company. Thereupon, the Optionee shall have full voting, dividend and other ownership rights with respect to such shares of Stock.
(c) Notwithstanding any other provision hereof or of the Plan, no portion of this Stock Option shall be exercisable after the Expiration Date hereof.
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3. Termination of Service Relationship. If the Optionee’s Service Relationship with the Company or a Subsidiary (as defined in the Plan) is terminated, the period within which to exercise the Stock Option may be subject to earlier termination as set forth below.
(a) Termination Due to Death. If the Optionee’s Service Relationship with the Company or a Subsidiary terminates by reason of the Optionee’s death, any portion of this Stock Option outstanding on such date, to the extent exercisable on the date of death, may thereafter be exercised by the Optionee’s legal representative or legatee for a period of 12 months from the date of death or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of death shall terminate immediately and be of no further force or effect.
(b) Termination Due to Disability. If the Optionee’s Service Relationship with the Company or a Subsidiary terminates by reason of the Optionee’s disability (as determined by the Administrator), any portion of this Stock Option outstanding on such date, to the extent exercisable on the date of such termination, may thereafter be exercised by the Optionee for a period of 12 months from the date of disability or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of disability shall terminate immediately and be of no further force or effect.
(c) Termination for Cause. If the Optionee’s Service Relationship with the Company or a Subsidiary terminates for Cause, any portion of this Stock Option outstanding on such date shall terminate immediately and be of no further force and effect. For purposes hereof, “Cause” shall mean, unless otherwise provided in an employment or other service agreement between the Company and the Optionee, a determination by the Administrator that the Optionee shall be dismissed as a result of (i) any material breach by the Optionee of any agreement between the Optionee and the Company; (ii) the conviction of, indictment for or plea of nolo contendere by the Optionee to a felony or a crime involving moral turpitude; or (iii) any material misconduct or willful and deliberate non-performance (other than by reason of disability) by the Optionee of the Optionee’s duties to the Company.
(d) Other Termination. If the Optionee’s Service Relationship with the Company or a Subsidiary terminates for any reason other than the Optionee’s death, the Optionee’s disability or Cause, and unless otherwise determined by the Administrator, any portion of this Stock Option outstanding on such date may be exercised, to the extent exercisable on the date of termination, for a period of three months from the date of termination or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of termination shall terminate immediately and be of no further force or effect.
The Administrator’s determination of the reason for termination of the Optionee’s Service Relationship with the Company or a Subsidiary shall be conclusive and binding on the Optionee and his or her representatives or legatees.
4. Incorporation of Plan. Notwithstanding anything herein to the contrary, this Stock Option shall be subject to and governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan. Capitalized
3

terms in this Agreement shall have the meaning specified in the Plan, unless a different meaning is specified herein.
5. Transferability. This Agreement is personal to the Optionee, is non-assignable and is not transferable in any manner, by operation of law or otherwise, other than by will or the laws of descent and distribution. This Stock Option is exercisable, during the Optionee’s lifetime, only by the Optionee, and thereafter, only by the Optionee’s legal representative or legatee.
6. Tax Withholding. The Optionee shall, not later than the date as of which the exercise of this Stock Option becomes a taxable event for Federal income tax purposes, pay to the Company or make arrangements satisfactory to the Administrator for payment of any Federal, state, and local taxes required by law to be withheld on account of such taxable event. T he Company shall have the authority to cause the required tax withholding amount to be satisfied, in whole or in part, by (i) withholding from shares of Stock to be issued to the Grantee a number of shares of Stock with an aggregate Fair Market Value that would satisfy the withholding amount due; or (ii) causing its transfer agent to sell from the number of shares of Stock to be issued to the Grantee, the number of shares of Stock necessary to satisfy the Federal, state and local taxes required by law to be withheld from the Grantee on account of such transfer.
7. No Obligation to Continue Service Relationship. Neither the Company nor any Subsidiary is obligated by or as a result of the Plan or this Agreement to continue the Optionee in a Service Relationship with the Company or a Subsidiary, and neither the Plan nor this Agreement shall interfere in any way with the right of the Company or any Subsidiary to terminate the Optionee’s Service Relationship with the Company or a Subsidiary at any time.
8. Integration. This Agreement constitutes the entire agreement between the parties with respect to this Stock Option and supersedes all prior agreements and discussions between the parties concerning such subject matter.
9. Data Privacy Consent. In order to administer the Plan and this Agreement and to implement or structure future equity grants, the Company, its subsidiaries and affiliates and certain agents thereof (together, the “Relevant Companies”) may process any and all personal or professional data, including but not limited to Social Security or other identification number, home address and telephone number, date of birth and other information that is necessary or desirable for the administration of the Plan and/or this Agreement (the “Relevant Information”). By entering into this Agreement, the Optionee (i) authorizes the Company to collect, process, register and transfer to the Relevant Companies all Relevant Information; (ii) waives any privacy rights the Optionee may have with respect to the Relevant Information; (iii) authorizes the Relevant Companies to store and transmit such information in electronic form; and (iv) authorizes the transfer of the Relevant Information to any jurisdiction in which the Relevant Companies consider appropriate. The Optionee shall have access to, and the right to change, the Relevant Information. Relevant Information will only be used in accordance with applicable law.
4

10. Notices. Notices hereunder shall be mailed or delivered to the Company at its principal place of business and shall be mailed or delivered to the Optionee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing.

KLAVIYO, INC.
By: |
| Title:

The foregoing Agreement is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned. Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Optionee (including through an online acceptance process) is acceptable.

Dated: |  |  |
|  |  | Optionee’s Signature
|  |  | Optionee’s name and address:

5

Attachment 1
Vesting Schedule

Incremental Number of Option Shares Exercisable | Exercisability Date
_____________ (___%) | ____________
_____________ (___%) | ____________
_____________ (___%) | ____________
_____________ (___%) | ____________
_____________ (___%) | ____________

6

NON-QUALIFIED STOCK OPTION AGREEMENT
FOR NON-EMPLOYEE DIRECTORS
UNDER THE KLAVIYO, INC.
2023 STOCK OPTION AND INCENTIVE PLAN

Name of Optionee: |  |
No. of Option Shares: |  |  |
Option Exercise Price per Share: | $ |  |  |
| [FMV on Grant Date] |  |
Grant Date: |  |  |
Expiration Date: |  |  |
| [No more than 10 years] |

Pursuant to the Klaviyo, Inc. 2023 Stock Option and Incentive Plan as amended through the date hereof (the “Plan”), Klaviyo, Inc. (the “Company”) hereby grants to the Optionee named above, who is a Director of the Company but is not an employee of the Company, an option (the “Stock Option”) to purchase on or prior to the Expiration Date specified above all or part of the number of shares of Series A Common Stock, par value $0.001 per share (the “Stock”), of the Company specified above at the Option Exercise Price per Share specified above subject to the terms and conditions set forth herein and in the Plan. This Stock Option is not intended to be an “incentive stock option” under Section 422 of the Internal Revenue Code of 1986, as amended.
1. Exercisability Schedule. No portion of this Stock Option may be exercised until such portion shall have become exercisable. Except as set forth below, and subject to the discretion of the Administrator (as defined in Section 2 of the Plan) to accelerate the exercisability schedule hereunder, this Stock Option shall be exercisable with respect to the number of Option Shares specified in the schedule set forth in Attachment 1 on the dates indicated so long as the Optionee remains a member of the Board of the Company on such dates.
Notwithstanding anything to the contrary herein or in the Plan, all outstanding Option Shares shall become fully exercisable upon a Sale Event or upon the Grantee’s death or permanent disability (within the meaning of Section 22(e)(3) of the Code). Once exercisable, this Stock Option shall continue to be exercisable at any time or times prior to the close of business on the Expiration Date, subject to the provisions hereof and of the Plan.
2. Manner of Exercise.
(a) The Optionee may exercise this Stock Option only in the following manner: from time to time on or prior to the Expiration Date of this Stock Option, the Optionee may give written notice to the Administrator of his or her election to purchase some or all of the

Option Shares purchasable at the time of such notice. This notice shall specify the number of Option Shares to be purchased.
Payment of the purchase price for the Option Shares may be made by one or more of the following methods: (i) in cash, by certified or bank check or other instrument acceptable to the Administrator; (ii) through the delivery (or attestation to the ownership) of shares of Stock that have been purchased by the Optionee on the open market or that are beneficially owned by the Optionee and are not then subject to any restrictions under any Company plan and that otherwise satisfy any holding periods as may be required by the Administrator; (iii) by the Optionee delivering to the Company a properly executed exercise notice together with irrevocable instructions to a broker to promptly deliver to the Company cash or a check payable and acceptable to the Company to pay the option purchase price, provided that in the event the Optionee chooses to pay the option purchase price as so provided, the Optionee and the broker shall comply with such procedures and enter into such agreements of indemnity and other agreements as the Administrator shall prescribe as a condition of such payment procedure; (iv) by a “net exercise” arrangement pursuant to which the Company will reduce the number of shares of Stock issuable upon exercise by the largest whole number of shares with a Fair Market Value that does not exceed the aggregate exercise price; or (v) a combination of (i), (ii), (iii) and (iv) above. Payment instruments will be received subject to collection.
The transfer to the Optionee on the records of the Company or of the transfer agent of the Option Shares will be contingent upon (i) the Company’s receipt from the Optionee of the full purchase price for the Option Shares, as set forth above, (ii) the fulfillment of any other requirements contained herein or in the Plan or in any other agreement or provision of laws, and (iii) the receipt by the Company of any agreement, statement or other evidence that the Company may require to satisfy itself that the issuance of Stock to be purchased pursuant to the exercise of Stock Options under the Plan and any subsequent resale of the shares of Stock will be in compliance with applicable laws and regulations. In the event the Optionee chooses to pay the purchase price by previously-owned shares of Stock through the attestation method, the number of shares of Stock transferred to the Optionee upon the exercise of the Stock Option shall be net of the Shares attested to.
(b) The shares of Stock purchased upon exercise of this Stock Option shall be transferred to the Optionee on the records of the Company or of the transfer agent upon compliance to the satisfaction of the Administrator with all requirements under applicable laws or regulations in connection with such transfer and with the requirements hereof and of the Plan. The determination of the Administrator as to such compliance shall be final and binding on the Optionee. The Optionee shall not be deemed to be the holder of, or to have any of the rights of a holder with respect to, any shares of Stock subject to this Stock Option unless and until this Stock Option shall have been exercised pursuant to the terms hereof, the Company or the transfer agent shall have transferred the shares to the Optionee, and the Optionee’s name shall have been entered as the stockholder of record on the books of the Company. Thereupon, the Optionee shall have full voting, dividend and other ownership rights with respect to such shares of Stock.
2

(c) Notwithstanding any other provision hereof or of the Plan, no portion of this Stock Option shall be exercisable after the Expiration Date hereof.
3. Termination of Board Service. If the Optionee’s service on the Board of the Company is terminated, the period within which to exercise the Stock Option may be subject to earlier termination as set forth below.
(a) Termination Due to Death. If the Optionee’s service on the Board of the Company terminates by reason of the Optionee’s death, any portion of this Stock Option outstanding on such date, to the extent exercisable on the date of death, may thereafter be exercised by the Optionee’s legal representative or legatee for a period of 12 months from the date of death or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of death shall terminate immediately and be of no further force or effect.
(b) Other Termination. If the Optionee’s service on the Board of the Company terminates for any reason other than the Optionee’s death, any portion of this Stock Option outstanding on such date may be exercised, to the extent exercisable on the date the Optionee’s service on the Board of the Company terminates, for a period of three months from the date of the termination of the Optionee’s service on the Board of the Company or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of the termination of the Optionee’s service on the Board of the Company shall terminate immediately and be of no further force or effect.
4. Incorporation of Plan. Notwithstanding anything herein to the contrary, this Stock Option shall be subject to and governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different meaning is specified herein.
5. Transferability. This Agreement is personal to the Optionee, is non-assignable and is not transferable in any manner, by operation of law or otherwise, other than by will or the laws of descent and distribution. This Stock Option is exercisable, during the Optionee’s lifetime, only by the Optionee, and thereafter, only by the Optionee’s legal representative or legatee.
6. No Obligation to Continue in a Board Service. Neither the Plan nor this Stock Option confers upon the Optionee any rights with respect to continuance as a member of the Board of the Company.
7. Integration. This Agreement constitutes the entire agreement between the parties with respect to this Stock Option and supersedes all prior agreements and discussions between the parties concerning such subject matter.
8. Data Privacy Consent. In order to administer the Plan and this Agreement and to implement or structure future equity grants, the Company, its subsidiaries and affiliates and certain agents thereof (together, the “Relevant Companies”) may process any and all personal or
3

professional data, including but not limited to Social Security or other identification number, home address and telephone number, date of birth and other information that is necessary or desirable for the administration of the Plan and/or this Agreement (the “Relevant Information”). By entering into this Agreement, the Optionee (i) authorizes the Company to collect, process, register and transfer to the Relevant Companies all Relevant Information; (ii) waives any privacy rights the Optionee may have with respect to the Relevant Information; (iii) authorizes the Relevant Companies to store and transmit such information in electronic form; and (iv) authorizes the transfer of the Relevant Information to any jurisdiction in which the Relevant Companies consider appropriate. The Optionee shall have access to, and the right to change, the Relevant Information. Relevant Information will only be used in accordance with applicable law.
9. Notices. Notices hereunder shall be mailed or delivered to the Company at its principal place of business and shall be mailed or delivered to the Optionee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing.

KLAVIYO, INC.
By: |
| Title:

The foregoing Agreement is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned. Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Optionee (including through an online acceptance process) is acceptable.

Dated: |  |  |
|  |  | Optionee’s Signature
|  |  | Optionee’s name and address:

4

Attachment 1
Vesting Schedule

Incremental Number of Option Shares Exercisable | Exercisability Date
_____________ (___%) | ____________
_____________ (___%) | ____________
_____________ (___%) | ____________
_____________ (___%) | ____________
_____________ (___%) | ____________

5

RESTRICTED STOCK AWARD AGREEMENT
UNDER THE KLAVIYO, INC.
2023 STOCK OPTION AND INCENTIVE PLAN

Name of Grantee: |  |
No. of Shares: |  |  |
Grant Date: |  |  |

Pursuant to the Klaviyo, Inc. 2023 Stock Option and Incentive Plan (the “Plan”) as amended through the date hereof, Klaviyo, Inc. (the “Company”) hereby grants a Restricted Stock Award (an “Award”) to the Grantee named above. Upon acceptance of this Award, the Grantee shall receive the number of shares of Series A Common Stock, par value $0.001 per share (the “Stock”) of the Company specified above, subject to the restrictions and conditions set forth herein and in the Plan. The Company acknowledges the receipt from the Grantee of consideration with respect to the par value of the Stock in the form of cash, past or future services rendered to the Company by the Grantee or such other form of consideration as is acceptable to the Administrator.
1. Award. The shares of Restricted Stock awarded hereunder shall be issued and held by the Company’s transfer agent in book entry form, and the Grantee’s name shall be entered as the stockholder of record on the books of the Company. Thereupon, the Grantee shall have all the rights of a stockholder with respect to such shares, including voting and dividend rights, subject, however, to the restrictions and conditions specified in Paragraph 2 below. The Grantee shall (i) sign and deliver to the Company a copy of this Award Agreement and (ii) deliver to the Company a stock power endorsed in blank.
2. Restrictions and Conditions.
(a) Any book entries for the shares of Restricted Stock granted herein shall bear an appropriate legend, as determined by the Administrator in its sole discretion, to the effect that such shares are subject to restrictions as set forth herein and in the Plan.
(b) Shares of Restricted Stock granted herein may not be sold, assigned, transferred, pledged or otherwise encumbered or disposed of by the Grantee prior to vesting.
(c) If the Grantee’s Service Relationship with the Company and its Subsidiaries is voluntarily or involuntarily terminated for any reason (including death) prior to vesting of shares of Restricted Stock granted herein, all shares of Restricted Stock shall immediately and automatically be forfeited and returned to the Company.
3. Vesting of Restricted Stock. The restrictions and conditions in Paragraph 2 of this Agreement shall lapse on the Vesting Date or Dates specified in the schedule set forth in

Attachment 1 so long as the Grantee continues to have a Service Relationship with the Company or a Subsidiary on such Dates. If a series of Vesting Dates is specified, then the restrictions and conditions in Paragraph 2 shall lapse only with respect to the number of shares of Restricted Stock specified as vested on such date. Subsequent to such Vesting Date or Dates, the shares of Stock on which all restrictions and conditions have lapsed shall no longer be deemed Restricted Stock. The Administrator may at any time accelerate the vesting schedule specified in this Paragraph 3.
4. Dividends. Dividends on shares of Restricted Stock shall be paid currently to the Grantee.
5. Incorporation of Plan. Notwithstanding anything herein to the contrary, this Award shall be subject to and governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different meaning is specified herein.
6. Transferability. This Agreement is personal to the Grantee, is non-assignable and is not transferable in any manner, by operation of law or otherwise, other than by will or the laws of descent and distribution.
7. Tax Withholding. The Grantee shall, not later than the date as of which the receipt of this Award becomes a taxable event for Federal income tax purposes, pay to the Company or make arrangements satisfactory to the Administrator for payment of any Federal, state, and local taxes required by law to be withheld on account of such taxable event. Except in the case where an election is made pursuant to Paragraph 8 below, t he Company shall have the authority to cause the required tax withholding amount to be satisfied, in whole or in part, by (i) withholding from shares of Stock to be issued to the Grantee a number of shares of Stock with an aggregate Fair Market Value that would satisfy the withholding amount due; or (ii) causing its transfer agent to sell from the number of shares of Stock to be issued to the Grantee, the number of shares of Stock necessary to satisfy the Federal, state and local taxes required by law to be withheld from the Grantee on account of such transfer.
8. Election Under Section 83(b). The Grantee and the Company hereby agree that the Grantee may, within 30 days following the Grant Date of this Award, file with the Internal Revenue Service and the Company an election under Section 83(b) of the Internal Revenue Code. In the event the Grantee makes such an election, he or she agrees to provide a copy of the election to the Company. The Grantee acknowledges that he or she is responsible for obtaining the advice of his or her tax advisors with regard to the Section 83(b) election and that he or she is relying solely on such advisors and not on any statements or representations of the Company or any of its agents with regard to such election.
9. No Obligation to Continue Service Relationship. Neither the Company nor any Subsidiary is obligated by or as a result of the Plan or this Agreement to continue the Grantee in a Service Relationship with the Company or any Subsidiary, and neither the Plan nor this
2

Agreement shall interfere in any way with the right of the Company or any Subsidiary to terminate the Grantee’s Service Relationship with the Company or any Subsidiary at any time.
10. Integration. This Agreement constitutes the entire agreement between the parties with respect to this Award and supersedes all prior agreements and discussions between the parties concerning such subject matter.
11. Data Privacy Consent. In order to administer the Plan and this Agreement and to implement or structure future equity grants, the Company, its subsidiaries and affiliates and certain agents thereof (together, the “Relevant Companies”) may process any and all personal or professional data, including but not limited to Social Security or other identification number, home address and telephone number, date of birth and other information that is necessary or desirable for the administration of the Plan and/or this Agreement (the “Relevant Information”). By entering into this Agreement, the Grantee (i) authorizes the Company to collect, process, register and transfer to the Relevant Companies all Relevant Information; (ii) waives any privacy rights the Grantee may have with respect to the Relevant Information; (iii) authorizes the Relevant Companies to store and transmit such information in electronic form; and (iv) authorizes the transfer of the Relevant Information to any jurisdiction in which the Relevant Companies consider appropriate. The Grantee shall have access to, and the right to change, the Relevant Information. Relevant Information will only be used in accordance with applicable law.
12. Notices. Notices hereunder shall be mailed or delivered to the Company at its principal place of business and shall be mailed or delivered to the Grantee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing.

KLAVIYO, INC.
By: |
| Title:

3

The foregoing Agreement is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned. Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Grantee (including through an online acceptance process) is acceptable.

Dated: |  |  |
|  |  | Grantee’s Signature
|  |  | Grantee’s name and address:

4

Attachment 1
Vesting Schedule

Incremental Number of Shares Vested | Vesting Date
_____________ (___%) | _____________
_____________ (___%) | _____________
_____________ (___%) | _____________
_____________ (___%) | _____________
_____________ (___%) | _____________

5

RESTRICTED STOCK UNIT AWARD AGREEMENT
UNDER KLAVIYO, INC.
2023 STOCK OPTION AND INCENTIVE PLAN

Name of Grantee: |  |
No. of Restricted Stock Units: |  |  |
Grant Date: |  |  |

Pursuant to the Klaviyo, Inc. 2023 Stock Option and Incentive Plan as amended through the date hereof (the “Plan”), Klaviyo, Inc. (the “Company”) hereby grants an award of the number of Restricted Stock Units listed above (an “Award”) to the Grantee named above. Each Restricted Stock Unit shall relate to one share of Series A Common Stock, par value $0.001 per share (the “Stock”) of the Company.
1. Restrictions on Transfer of Award. This Award may not be sold, transferred, pledged, assigned or otherwise encumbered or disposed of by the Grantee, and any shares of Stock issuable with respect to the Award may not be sold, transferred, pledged, assigned or otherwise encumbered or disposed of until (i) the Restricted Stock Units have vested as provided in Paragraph 2 of this Agreement and (ii) shares of Stock have been issued to the Grantee in accordance with the terms of the Plan and this Agreement.
2. Vesting of Restricted Stock Units. The restrictions and conditions of Paragraph 1 of this Agreement shall lapse on the Vesting Date or Dates specified in the schedule set forth in Attachment 1 so long as the Grantee continues to have a Service Relationship with the Company or a Subsidiary on such Dates. If a series of Vesting Dates is specified, then the restrictions and conditions in Paragraph 1 shall lapse only with respect to the number of Restricted Stock Units specified as vested on such date. The Administrator may at any time accelerate the vesting schedule specified in this Paragraph 2.
3. Termination of Service Relationship. If the Grantee’s Service Relationship with the Company and its Subsidiaries terminates for any reason (including death or disability) prior to the satisfaction of the vesting conditions set forth in Paragraph 2 above, any Restricted Stock Units that have not vested as of such date shall automatically and without notice terminate and be forfeited, and neither the Grantee nor any of his or her successors, heirs, assigns, or personal representatives will thereafter have any further rights or interests in such unvested Restricted Stock Units.
4. Issuance of Shares of Stock. As soon as practicable following each Vesting Date (but in no event later than two and one-half months after the end of the year in which the Vesting Date occurs), the Company shall issue to the Grantee the number of shares of Stock equal to the aggregate number of Restricted Stock Units that have vested pursuant to Paragraph 2 of this

Agreement on such date and the Grantee shall thereafter have all the rights of a stockholder of the Company with respect to such shares.
5. Incorporation of Plan. Notwithstanding anything herein to the contrary, this Agreement shall be subject to and governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different meaning is specified herein.
6. Tax Withholding. The Grantee shall, not later than the date as of which the receipt of this Award becomes a taxable event for Federal income tax purposes, pay to the Company or make arrangements satisfactory to the Administrator for payment of any Federal, state, and local taxes required by law to be withheld on account of such taxable event. T he Company shall have the authority to cause the required tax withholding amount to be satisfied, in whole or in part, by (i) withholding from shares of Stock to be issued to the Grantee a number of shares of Stock with an aggregate Fair Market Value that would satisfy the withholding amount due; or (ii) causing its transfer agent to sell from the number of shares of Stock to be issued to the Grantee, the number of shares of Stock necessary to satisfy the Federal, state and local taxes required by law to be withheld from the Grantee on account of such transfer.
7. Section 409A of the Code. This Agreement shall be interpreted in such a manner that all provisions relating to the settlement of the Award are exempt from the requirements of Section 409A of the Code as “short-term deferrals” as described in Section 409A of the Code.
8. No Obligation to Continue Service Relationship. Neither the Company nor any Subsidiary is obligated by or as a result of the Plan or this Agreement to continue the Grantee’s Service Relationship with the Company and its Subsidiaries, and neither the Plan nor this Agreement shall interfere in any way with the right of the Company or any Subsidiary to terminate the Grantee’s Service Relationship with the Company and its Subsidiaries at any time.
9. Integration. This Agreement constitutes the entire agreement between the parties with respect to this Award and supersedes all prior agreements and discussions between the parties concerning such subject matter.
10. Data Privacy Consent. In order to administer the Plan and this Agreement and to implement or structure future equity grants, the Company, its subsidiaries and affiliates and certain agents thereof (together, the “Relevant Companies”) may process any and all personal or professional data, including but not limited to Social Security or other identification number, home address and telephone number, date of birth and other information that is necessary or desirable for the administration of the Plan and/or this Agreement (the “Relevant Information”). By entering into this Agreement, the Grantee (i) authorizes the Company to collect, process, register and transfer to the Relevant Companies all Relevant Information; (ii) waives any privacy rights the Grantee may have with respect to the Relevant Information; (iii) authorizes the Relevant Companies to store and transmit such information in electronic form; and (iv) authorizes the transfer of the Relevant Information to any jurisdiction in which the Relevant Companies consider appropriate. The Grantee shall have access to, and the right to change, the
2

Relevant Information. Relevant Information will only be used in accordance with applicable law.
11. Notices. Notices hereunder shall be mailed or delivered to the Company at its principal place of business and shall be mailed or delivered to the Grantee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing.

KLAVIYO, INC.
By: |
| Title:

The foregoing Agreement is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned. Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Grantee (including through an online acceptance process) is acceptable.

Dated: |  |  |
|  |  | Grantee’s Signature
|  |  | Grantee’s name and address:

3

Attachment 1
Vesting Schedule

Incremental Number of Restricted Stock Units Vested | Vesting Date
_____________ (___%) | _______________
_____________ (___%) | _______________
_____________ (___%) | _______________
_____________ (___%) | _______________

4

RESTRICTED STOCK UNIT AWARD AGREEMENT
FOR NON-EMPLOYEE DIRECTORS
UNDER THE KLAVIYO, INC.
2023 STOCK OPTION AND INCENTIVE PLAN

Name of Grantee: |  |
No. of Restricted Stock Units: |  |  |
Grant Date: |  |  |

Pursuant to the Klaviyo, Inc. 2023 Stock Option and Incentive Plan as amended through the date hereof (the “Plan”), Klaviyo, Inc. (the “Company”) hereby grants an award of the number of Restricted Stock Units listed above (an “Award”) to the Grantee named above. Each Restricted Stock Unit shall relate to one share of Series A Common Stock, par value $0.001 per share (the “Stock”) of the Company.
1. Restrictions on Transfer of Award. This Award may not be sold, transferred, pledged, assigned or otherwise encumbered or disposed of by the Grantee, and any shares of Stock issuable with respect to the Award may not be sold, transferred, pledged, assigned or otherwise encumbered or disposed of until (i) the Restricted Stock Units have vested as provided in Paragraph 2 of this Agreement and (ii) shares of Stock have been issued to the Grantee in accordance with the terms of the Plan and this Agreement.
2. Vesting of Restricted Stock Units. The restrictions and conditions of Paragraph 1 of this Agreement shall lapse on the Vesting Date or Dates specified in the schedule set forth in Attachment 1 so long as the Grantee continues to remain in service on the Board of the Company. If a series of Vesting Dates is specified, then the restrictions and conditions in Paragraph 1 shall lapse only with respect to the number of Restricted Stock Units specified as vested on such date.
Notwithstanding anything to the contrary herein or in the Plan, all outstanding Restricted Stock Units shall become fully vested upon a Sale Event or upon the Grantee’s death or permanent disability (within the meaning of Section 22(e)(3) of the Code). The Administrator may at any time accelerate the vesting schedule specified in this Paragraph 2.
3. Termination of Board Service. If the Grantee’s service on the Board of the Company terminates for any reason (including death or disability) prior to the satisfaction of the vesting conditions set forth in Paragraph 2 above, any Restricted Stock Units that have not vested as of such date shall automatically and without notice terminate and be forfeited, and neither the Grantee nor any of his or her successors, heirs, assigns, or personal representatives will thereafter have any further rights or interests in such unvested Restricted Stock Units.

4. Issuance of Shares of Stock. As soon as practicable following each Vesting Date (but in no event later than two and one-half months after the end of the year in which the Vesting Date occurs), the Company shall issue to the Grantee the number of shares of Stock equal to the aggregate number of Restricted Stock Units that have vested pursuant to Paragraph 2 of this Agreement on such date and the Grantee shall thereafter have all the rights of a stockholder of the Company with respect to such shares.
5. Incorporation of Plan. Notwithstanding anything herein to the contrary, this Agreement shall be subject to and governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different meaning is specified herein.
6. Section 409A of the Code. This Agreement shall be interpreted in such a manner that all provisions relating to the settlement of the Award are exempt from the requirements of Section 409A of the Code as “short-term deferrals” as described in Section 409A of the Code.
7. No Obligation to Continue as a Director. Neither the Plan nor this Award confers upon the Grantee any rights with respect to continuance as a Director.
8. Integration. This Agreement constitutes the entire agreement between the parties with respect to this Award and supersedes all prior agreements and discussions between the parties concerning such subject matter.
9. Data Privacy Consent. In order to administer the Plan and this Agreement and to implement or structure future equity grants, the Company, its subsidiaries and affiliates and certain agents thereof (together, the “Relevant Companies”) may process any and all personal or professional data, including but not limited to Social Security or other identification number, home address and telephone number, date of birth and other information that is necessary or desirable for the administration of the Plan and/or this Agreement (the “Relevant Information”). By entering into this Agreement, the Grantee (i) authorizes the Company to collect, process, register and transfer to the Relevant Companies all Relevant Information; (ii) waives any privacy rights the Grantee may have with respect to the Relevant Information; (iii) authorizes the Relevant Companies to store and transmit such information in electronic form; and (iv) authorizes the transfer of the Relevant Information to any jurisdiction in which the Relevant Companies consider appropriate. The Grantee shall have access to, and the right to change, the Relevant Information. Relevant Information will only be used in accordance with applicable law.
10. Notices. Notices hereunder shall be mailed or delivered to the Company at its principal place of business and shall be mailed or delivered to the Grantee at the address on file
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with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing.

KLAVIYO, INC.
By: |
| Title:

The foregoing Agreement is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned. Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Grantee (including through an online acceptance process) is acceptable.

Dated: |  |  |
|  |  | Grantee’s Signature
|  |  | Grantee’s name and address:

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Attachment 1
Vesting Schedule

Incremental Number of Restricted Stock Units Vested | Vesting Date
_____________ (___%) | _______________
_____________ (___%) | _______________
_____________ (___%) | _______________
_____________ (___%) | _______________

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GLOBAL RESTRICTED STOCK UNIT AWARD AGREEMENT
UNDER KLAVIYO, INC.
2023 STOCK OPTION AND INCENTIVE PLAN

Name of Grantee: |  |
No. of Restricted Stock Units: |  |  |
Grant Date: |  |  |

Pursuant to the Klaviyo, Inc. 2023 Stock Option and Incentive Plan as amended through the date hereof (the “Plan”), and this Global Restricted Stock Unit Award Agreement, including any additional terms and conditions for the Grantee's country set forth in the appendix attached hereto (the “Appendix,” and together with the Global Restricted Stock Unit Award Agreement, the “Agreement”), Klaviyo, Inc. (the “Company”) hereby grants an award of the number of Restricted Stock Units listed above (an “Award”) to the Grantee named above. Each Restricted Stock Unit shall relate to one share of Series A Common Stock, par value $0.001 per share (the “Stock”) of the Company. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different meaning is specified herein.
1. Restrictions on Transfer of Award. This Award may not be sold, transferred, pledged, assigned or otherwise encumbered or disposed of by the Grantee, and any shares of Stock issuable with respect to the Award may not be sold, transferred, pledged, assigned or otherwise encumbered or disposed of until (i) the Restricted Stock Units have vested as provided in Paragraph 2 of this Agreement and (ii) shares of Stock have been issued to the Grantee in accordance with the terms of the Plan and this Agreement.
2. Vesting of Restricted Stock Units. The restrictions and conditions of Paragraph 1 of this Agreement shall lapse on the Vesting Date or Dates specified in the schedule set forth in Attachment 1 so long as the Grantee continues to have a Service Relationship on such Dates. If a series of Vesting Dates is specified, then the restrictions and conditions in Paragraph 1 shall lapse only with respect to the number of Restricted Stock Units specified as vested on such date. The Administrator may at any time accelerate the vesting schedule specified in this Paragraph 2.
3. Termination of Service Relationship. If the Grantee’s Service Relationship terminates for any reason (including death or disability) prior to the satisfaction of the vesting conditions set forth in Paragraph 2 above, any Restricted Stock Units that have not vested as of such date shall automatically and without notice terminate and be forfeited, and neither the Grantee nor any of his or her successors, heirs, assigns, or personal representatives will thereafter have any further rights or interests in such unvested Restricted Stock Units. For the avoidance of doubt, service during only a portion of the vesting period, but where the Grantee’s Service Relationship has terminated prior to a Vesting Date (as defined in Paragraph 2), will not entitle the Grantee to vest in a pro-rata portion of the Restricted Stock Units.

For purposes of this Award, the Grantee’s Service Relationship will be considered terminated as of the date the Grantee is no longer actively providing services to the Company or any of its Affiliates (regardless of the reason for such termination and whether or not later found to be invalid or in breach of employment or other laws in the jurisdiction where the Grantee is employed or otherwise rendering services or the terms of the Grantee’s employment or other service agreement, if any), and will not be extended by any notice period (e.g., the Grantee’s period of service would not include any contractual notice period or any period of “garden leave” or similar period mandated under employment or other laws in the jurisdiction where the Grantee is employed or otherwise rendering services or the terms of the Grantee’s employment or other service agreement, if any). The Administrator shall have the exclusive discretion to determine when the Grantee is no longer actively providing services for purposes of this Award (including whether the Grantee may still be considered to be providing services while on a leave of absence).
4. Issuance of Shares of Stock. Subject to Paragraph 6 of this Agreement, as soon as practicable following each Vesting Date (but in no event later than two and one-half months after the end of the year in which the Vesting Date occurs), the Company shall issue to the Grantee the number of shares of Stock equal to the aggregate number of Restricted Stock Units that have vested pursuant to Paragraph 2 of this Agreement on such date and the Grantee shall thereafter have all the rights of a stockholder of the Company with respect to such shares.
5. Incorporation of Plan. Notwithstanding anything herein to the contrary, this Agreement shall be subject to and governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan.
6. Responsibility for Taxes.
(a) The Grantee acknowledges that, regardless of any action taken by the Company or, if different, the Affiliate which employs the Grantee or for which the Grantee otherwise provides services (the “Service Recipient”), the ultimate liability for all income tax, social security contributions, payroll tax, fringe benefits tax, payment on account or other tax-related items related to the Grantee’s participation in the Plan and legally applicable or deemed applicable to the Grantee (“Tax-Related Items”) is and remains the Grantee’s responsibility and may exceed the amount, if any, actually withheld by the Company or the Service Recipient. The Grantee further acknowledges that the Company and/or the Service Recipient (i) make no representations or undertakings regarding the treatment of any Tax-Related Items in connection with any aspect of the Restricted Stock Units or the underlying shares of Stock, including, but not limited to, the grant, vesting or settlement of the Restricted Stock Units, the subsequent sale of shares of Stock acquired pursuant to such settlement and receipt of any dividends; and (ii) do not commit to and are under no obligation to structure the terms of the grant or any aspect of the Restricted Stock Units to reduce or eliminate the Grantee’s liability for Tax-Related Items or to achieve any particular tax result. Further, if the Grantee is subject to Tax-Related Items in more than one jurisdiction, the Grantee acknowledges that the Company and/or the Service Recipient (or former service recipient, as applicable) may be required to withhold or account for Tax-Related Items in more than one jurisdiction.
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(b) In connection with any relevant taxable or tax withholding event, as applicable, the Grantee agrees to make adequate arrangements satisfactory to the Company and/or the Service Recipient to satisfy all Tax-Related Items. In this regard, the Grantee authorizes the Company and/or the Service Recipient, or their respective agents, at their discretion, to satisfy any applicable withholding obligations or rights with regard to all Tax-Related Items by one or a combination of the following: (i) requiring the Grantee to make a payment in a form acceptable to the Company; (ii) withholding from the Grantee’s wages or other compensation payable to the Grantee, (iii) withholding from proceeds of the sale of shares of Stock acquired upon settlement of the Restricted Stock Units either through a voluntary sale or through a mandatory sale arranged by the Company (on the Grantee’s behalf pursuant to this authorization without further consent), (iv) withholding shares of Stock to be issued upon settlement of the Restricted Stock Units, or (v) any other method of withholding determined by the Company to be permitted by applicable law.
(c) The Company and/or Service Recipient may withhold or account for Tax-Related Items by considering statutory or other withholding rates, including maximum rates applicable in the Grantee’s jurisdiction. In the event of over-withholding, the Grantee may receive a refund from the Company of any over-withheld amount in cash (with no entitlement to the equivalent in shares of Stock), or if not refunded by the Company, the Grantee may seek a refund from local tax authorities to the extent the Grantee wishes to recover the over-withheld amount in the form of a refund. In the event of under-withholding, the Grantee may be required to pay any additional Tax-Related Items directly to the applicable tax authority or to the Company and/or the Service Recipient. If the obligation for Tax-Related Items is satisfied by withholding shares of Stock, for tax purposes, the Grantee will be deemed to have been issued the full number of shares of Stock subject to the vested Restricted Stock Units, notwithstanding that a number of shares of Stock is held back solely for the purpose of paying the Tax Related Items.
(d) Finally, the Grantee agrees to pay to the Company or the Service Recipient any amount of Tax-Related Items that the Company or the Service Recipient may be required to withhold or account for as a result of the Grantee’s participation in the Plan that cannot be satisfied by the means previously described. The Company may refuse to issue or deliver the underlying shares of Stock or the proceeds from the sale of the shares of Stock if the Grantee fails to comply with his or her obligations in connection with the Tax-Related Items.
7. Nature of Grant. In accepting the Restricted Stock Units, the Grantee acknowledges, understands and agrees that:
(a) the Plan is established voluntarily by the Company, it is discretionary in nature, and may be modified, amended, suspended or terminated by the Company at any time, to the extent permitted under the Plan;
(b) the grant of the Restricted Stock Units is exceptional, voluntary and occasional and does not create any contractual or other right to receive future grants of Restricted Stock Units, or benefits in lieu of Restricted Stock Units, even if Restricted Stock Units have been granted in the past;
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(c) all decisions with respect to future Restricted Stock Units or other grants, if any, will be at the sole discretion of the Company;
(d) the Grantee is voluntarily participating in the Plan;
(e) the Restricted Stock Units and the shares of Stock subject to the Restricted Stock Units, and the income from and value of same, are not intended to replace any pension rights or compensation;
(f) the Restricted Stock Units and the shares of Stock subject to the Restricted Stock Units, and the income from and value of same, are not part of normal or expected wages or salary for any purpose, including, but not limited to, calculation of any severance, resignation, termination, redundancy, dismissal, end-of-service payments, bonuses, holiday pay, long-service awards, pension or retirement or welfare benefits or similar payments;
(g) the future value of the underlying shares of Stock is unknown, indeterminable, and cannot be predicted with certainty;
(h) no claim or entitlement to compensation or damages shall arise from forfeiture of the Restricted Stock Units resulting from the termination of the Grantee’s Service Relationship (for any reason whatsoever, whether or not later found to be invalid or in breach of employment or other laws in the jurisdiction where the Grantee is employed or otherwise rendering services or the terms of the Grantee’s employment or other service agreement, if any);
(i) unless otherwise provided by the Company, the Restricted Stock Units and any shares of Stock acquired under the Plan, and the income from and value of same, are not granted as consideration for, or in connection with, the service the Grantee may provide as a director of any Affiliate;
(j) unless otherwise provided in the Plan or by the Company in its discretion, the Restricted Stock Units and the benefits evidenced by this Agreement do not create any entitlement to have the Restricted Stock Units or any such benefits transferred to, or assumed by, another company, nor to be exchanged, cashed out or substituted for, in connection with any corporate transaction affecting the shares of Stock; and
(k) neither the Company, the Service Recipient nor any other Affiliate shall be liable for any foreign exchange rate fluctuation between the Grantee’s local currency and the United States Dollar that may affect the value of the Restricted Stock Units or of any amounts due to the Grantee pursuant to the settlement of the Restricted Stock Units or the subsequent sale of shares of Stock acquired upon settlement.
8. No Advice Regarding Grant. The Company is not providing any tax, legal or financial advice, nor is the Company making recommendations regarding the Grantee’s participation in the Plan or the Grantee’s acquisition or sale of the underlying shares of Stock. The Grantee understands and agrees that the Grantee should consult with his or her own personal
4

tax, legal and financial advisors regarding the Grantee’s participation in the Plan before taking any action related to the Plan.
9. Data Privacy Consent.
(a) Data Collection and Usage. The Company and the Service Recipient collect, process and use certain personal information about the Grantee, including, but not limited to, the Grantee’s name, home address, telephone number, email address, date of birth, social insurance number, passport or other identification number, salary, nationality, job title, any shares of Stock or directorships held in the Company, details of all Restricted Stock Units granted under the Plan or any other entitlement to shares of Stock awarded, canceled, exercised, vested, unvested or outstanding in the Grantee’s favor (“Data”), for the legitimate purpose of implementing, administering and managing the Plan. Where required, the legal basis for the collection and processing of Data is the Grantee’s consent.
(b) Stock Plan Administration and Service Providers. The Grantee understands that the Company transfers Data to Fidelity Stock Plan Services, a third-party stock plan administrator/broker (together with certain of its affiliates, the “Service Provider”), which assists the Company with the implementation, administration and management of the Plan. The Grantee may be asked to agree on separate terms and data processing practices with the Service Provider, with such agreement being a condition to the ability to participate in the Plan. Where required, the legal basis for the transfer of Data to the Service Provider is the Grantee’s consent.
(c) International Data Transfers. The Grantee’s country or jurisdiction may have different data privacy laws and protections than the country(ies) where the Data will be stored, and foreign courts, law enforcement, regulators and national security authorities may be able to access the Data. The Company’s legal basis, where required, for the international transfer of Data is the Grantee’s consent.
(d) Data Retention. The Company will hold and use Data only as long as is necessary to implement, administer and manage the Grantee’s participation in the Plan, or as required to comply with legal or regulatory obligations, including under tax, exchange control, securities and labor laws. This may mean Data is retained after the Grantee’s Service Relationship ends, plus any additional time periods necessary for compliance with law, exercise or defense of legal rights, archiving, back-up and deletion purposes.
(e) Voluntariness and Consequences of Consent Denial or Withdrawal. Participation in the Plan is voluntary and the Grantee is providing the consents herein on a voluntary basis. The Grantee understands that the Grantee may refuse the collection of the Data or request to stop the transfer and processing of the Data and that the Grantee’s compensation from or Service Relationship with the Service Recipient will not be affected. The Grantee understands that the only consequence of refusing or withdrawing consent is that the Company may not be able to continue to facilitate the Grantee’s participation in the Plan.
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(f) Data Subject Rights. The Grantee may have a number of rights under data privacy laws in the Grantee’s jurisdiction. Depending on where the Grantee is based, such rights may include the right to (specifically in respect of the Grantee’s Data): (i) request access to or copies of Data held by the Company, (ii) request that inaccurate or incomplete Data be rectified, (iii) request that Data be deleted, (iv) request that the processing of Data be restricted to certain purposes, (v) request that the transfer of Data be restricted to certain purposes, (vi) lodge complaints with competent authorities in the Grantee’s jurisdiction, and/or (vii) receive a list with the names and addresses of any potential third party recipients or transferees of Data. To receive clarification regarding the availability of these rights, to exercise these rights or to otherwise inquire about the Company’s collection, use or transfer of Data, the Grantee can contact the Grantee’s local human resources representative.
10. Section 409A of the Code. This Agreement shall be interpreted in such a manner that all provisions relating to the settlement of the Award are exempt from the requirements of Section 409A of the Code as “short-term deferrals” as described in Section 409A of the Code.
11. No Obligation to Continue Service Relationship. Neither the Company, the Service Recipient, nor any other Affiliate, as applicable, is obligated by or as a result of the Plan or this Agreement to continue the Grantee’s Service Relationship, and neither the Plan nor this Agreement shall (i) create a right to employment or other service relationship with the Company or any of its Affiliates; (ii) be interpreted as forming or amending an employment or other service agreement with the Company, the Service Recipient or any other Affiliate, and/or (iii) interfere in any way with the right of the Company, the Service Recipient or any other Affiliate, as applicable, to terminate the Grantee’s Service Relationship at any time.
12. Integration. This Agreement constitutes the entire agreement between the parties with respect to this Award and supersedes all prior agreements and discussions between the parties concerning such subject matter.
13. Governing Law/Venue. This Award and the terms and conditions of this Agreement and all determinations made and actions taken pursuant hereto shall be governed by, and construed in accordance with, the General Corporation Law of the State of Delaware as to matters within the scope thereof, and as to all other matters shall be governed by and construed in accordance with the internal laws of the Commonwealth of Massachusetts, applied without regard to conflict of law principles. Any and all disputes relating to, concerning or arising from this Agreement, or relating to, concerning or arising from the relationship between the parties evidenced by the Restricted Stock Units or this Agreement, shall be brought and heard exclusively in the United States District Court for the District of New Delaware or the Delaware Superior Court, New Castle County. Each of the parties hereby represents and agrees that such party is subject to the personal jurisdiction of said courts; hereby irrevocably consents to the jurisdiction of such courts in any legal or equitable proceedings related to, concerning or arising from such dispute, and waives, to the fullest extent permitted by law, any objection which such party may now or hereafter have that the laying of the venue of any legal or equitable proceedings related to, concerning or arising from such dispute which is brought in such courts is improper or that such proceedings have been brought in an inconvenient forum.
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14. Compliance with Law. Notwithstanding any other provision in the Plan or this Agreement, unless there is an available exemption from registration, qualification or other legal requirement applicable to the shares of Stock, the Company shall not be required to permit the vesting of the Award and/or deliver any shares of Stock prior to the completion of any registration or qualification of the shares of Stock under any U.S. or non-U.S. local, state or federal securities, exchange control or other applicable law or under rulings or regulations of the U.S. Securities and Exchange Commission (“SEC”) or of any other governmental regulatory body, or prior to obtaining any approval or other clearance from any U.S. or non-U.S. local, state or federal governmental agency, which registration, qualification or approval the Company shall, in its absolute discretion, deem necessary or advisable. The Grantee understands that the Company is under no obligation to register or qualify the shares of Stock with the SEC or any state or non-U.S. securities commission or to seek approval or clearance from any governmental authority for the issuance or sale of the shares of Stock subject to this Award. Further, the Grantee agrees that the Company shall have unilateral authority to amend this Agreement without the Grantee’s consent to the extent necessary to comply with securities or other laws applicable to the issuance of shares of Stock subject to this Award.
15. Insider Trading Restrictions/Market Abuse Laws. The Grantee acknowledges that, the Grantee may be subject to insider trading restrictions and/or market abuse laws in applicable jurisdictions, including but not limited to Canada, the Grantee’s country, the Service Provider’s country and the country or country in which the shares of Stock are or may be listed, which may affect his or her ability, directly or indirectly, to acquire, sell or attempt to sell or otherwise dispose of shares of Stock or rights to shares of Stock (e.g., Restricted Stock Units), under the Plan during such times as the Grantee is considered to have “inside information” regarding the Company (as defined by laws in the applicable jurisdiction(s)). Furthermore, the Grantee understands that he or she may be prohibited from (i) disclosing the inside information to any third party, including fellow employees, and (ii) “tipping” third parties by sharing with them Company inside information, or otherwise causing third parties to buy or sell Company securities. Any restrictions under these laws or regulations are separate from and in addition to any restrictions that may be imposed under any applicable Company insider trading policy. The Grantee acknowledges that it is his or her responsibility to comply with any applicable restrictions as well as any applicable Company insider trading policy, and the Grantee should consult with his or her personal legal advisor on this matter.
16. Exchange Control, Foreign Asset/Account and/or Tax Requirements. The Grantee acknowledges that there may be certain foreign asset and/or account reporting requirements which may affect the Grantee’s ability to acquire or hold shares of Stock or cash received from participating in the Plan (including from any dividends paid on shares of Stock or sale proceeds arising from the sale of shares of Stock) in a brokerage or bank account outside the Grantee’s country. The Grantee may be required to report such accounts, assets, or transactions to the tax or other authorities in the Grantee’s country. The Grantee may also be required to repatriate sale proceeds or other funds received as a result of participating in the Plan to the Grantee’s country through a designated bank or broker and/or within a certain time after receipt. The Grantee acknowledges that he or she may be subject to tax payment and/or reporting obligations as the result of participating in the Plan and/or the sale of shares of Stock acquired under the Plan. The
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Grantee further acknowledges that it is his or her responsibility to comply with such requirements and that the Grantee should speak with his or her personal tax, legal and financial advisors on this matter.
17. Electronic Delivery and Participation. The Company may, in its sole discretion, decide to deliver any documents related to current or future participation in the Plan by electronic means. The Grantee hereby consents to receive such documents by electronic delivery and agrees to participate in the Plan through an on-line electronic system established and maintained by the Company or a third party designated by the Company.
18. Language. The Grantee acknowledges that he or she is sufficiently proficient in English or has consulted with an advisor who is sufficiently proficient in English so as to allow the Grantee to understand the terms and conditions of this Agreement. If the Grantee has received this Agreement or any other document related to the Plan translated into a language other than English and if the meaning of the translated version is different than the English version, the English version will control, unless otherwise required by applicable law.
19. Severability. The provisions of this Agreement are severable and if any one or more provisions are determined to be illegal or otherwise unenforceable, in whole or in part, the remaining provisions shall nevertheless be binding and enforceable.
20. Appendix. Notwithstanding any provisions in this Global Restricted Stock Unit Award Agreement, the Restricted Stock Units shall be subject to any additional terms and conditions for the Grantee’s country set forth in the Appendix attached hereto. Moreover, if the Grantee relocates to one of the countries included in the Appendix, the additional terms and conditions for such country, if any, will apply to the Grantee, to the extent the Company determines that the application of such terms and conditions is necessary or advisable for legal or administrative reasons. The Appendix constitutes part of this Agreement.
21. Imposition of Other Requirements. The Company reserves the right to impose other requirements on the Grantee’s participation in the Plan, on the Restricted Stock Units and on the shares of Stock acquired upon settlement of the Restricted Stock Units, to the extent the Company determines it is necessary or advisable for legal or administrative reasons, and to require the Grantee to sign any additional agreements or undertakings that may be necessary to accomplish the foregoing.
22. Waiver. The Grantee acknowledges that a waiver by the Company of breach of any provisions of this Agreement shall not operate or be construed as a waiver of any other provision of this Agreement, or of any subsequent breach by the Grantee or any other grantee.
23. Notices. Notices hereunder shall be mailed or delivered to the Company at its principal place of business and shall be mailed or delivered to the Grantee at the address on file
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with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing.

KLAVIYO, INC.
By: |
| Title:

9

The foregoing Agreement (including the Appendix) is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned. Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Grantee (including through an online acceptance process) is acceptable.

Dated: |  |  |
|  |  | Grantee’s Signature
|  |  | Grantee’s name and address:

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APPENDIX TO
GLOBAL RESTRICTED STOCK UNIT AWARD AGREEMENT
UNDER KLAVIYO, INC.
2023 STOCK OPTION AND INCENTIVE PLAN
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Attachment 1
Vesting Schedule

Incremental Number of Restricted Stock Units Vested | Vesting Date
_____________ (___%) | _______________
_____________ (___%) | _______________
_____________ (___%) | _______________
_____________ (___%) | _______________

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GLOBAL RESTRICTED STOCK UNIT AWARD AGREEMENT
FOR NON-EMPLOYEE DIRECTORS
UNDER KLAVIYO, INC.
2023 STOCK OPTION AND INCENTIVE PLAN

Name of Grantee: |  |
No. of Restricted Stock Units: |  |  |
Grant Date: |  |  |

Pursuant to the Klaviyo, Inc. 2023 Stock Option and Incentive Plan as amended through the date hereof (the “Plan”), and this Global Restricted Stock Unit Award Agreement, including any additional terms and conditions for the Grantee's country set forth in the appendix attached hereto (the “Appendix,” and together with the Global Restricted Stock Unit Award Agreement, the “Agreement”), Klaviyo, Inc. (the “Company”) hereby grants an award of the number of Restricted Stock Units listed above (an “Award”) to the Grantee named above. Each Restricted Stock Unit shall relate to one share of Series A Common Stock, par value $0.001 per share (the “Stock”) of the Company. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different meaning is specified herein.
1. Restrictions on Transfer of Award. This Award may not be sold, transferred, pledged, assigned or otherwise encumbered or disposed of by the Grantee, and any shares of Stock issuable with respect to the Award may not be sold, transferred, pledged, assigned or otherwise encumbered or disposed of until (i) the Restricted Stock Units have vested as provided in Paragraph 2 of this Agreement and (ii) shares of Stock have been issued to the Grantee in accordance with the terms of the Plan and this Agreement.
2. Vesting of Restricted Stock Units. The restrictions and conditions of Paragraph 1 of this Agreement shall lapse on the Vesting Date or Dates specified in the schedule set forth in Attachment 1 so long as the Grantee continues to remain in service on the Board of the Company. If a series of Vesting Dates is specified, then the restrictions and conditions in Paragraph 1 shall lapse only with respect to the number of Restricted Stock Units specified as vested on such date.
Notwithstanding anything to the contrary herein or in the Plan, all outstanding Restricted Stock Units shall become fully vested upon a Sale Event or upon the Grantee’s death or permanent disability (within the meaning of Section 22(e)(3) of the Code). The Administrator may at any time accelerate the vesting schedule specified in this Paragraph 2.
3. Termination of Board Service. If the Grantee’s service on the Board of the Company terminates for any reason (excluding death or disability) prior to the satisfaction of the vesting conditions set forth in Paragraph 2 above, any Restricted Stock Units that have not vested as of such date shall automatically and without notice terminate and be forfeited, and neither the

Grantee nor any of his or her successors, heirs, assigns, or personal representatives will thereafter have any further rights or interests in such unvested Restricted Stock Units. For the avoidance of doubt, service during only a portion of the vesting period, but where the Grantee’s Service Relationship has terminated prior to a Vesting Date (as defined in Paragraph 2), will not entitle the Grantee to vest in a pro-rata portion of the Restricted Stock Units.
4. Issuance of Shares of Stock. Subject to Paragraph 6 of this Agreement, as soon as practicable following each Vesting Date (but in no event later than two and one-half months after the end of the year in which the Vesting Date occurs), the Company shall issue to the Grantee the number of shares of Stock equal to the aggregate number of Restricted Stock Units that have vested pursuant to Paragraph 2 of this Agreement on such date and the Grantee shall thereafter have all the rights of a stockholder of the Company with respect to such shares.
5. Incorporation of Plan. Notwithstanding anything herein to the contrary, this Agreement shall be subject to and governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan.
6. Responsibility for Taxes.
(a) The Grantee acknowledges that, regardless of any action taken by the Company, the ultimate liability for all income tax, social security contributions, payroll tax, fringe benefits tax, payment on account or other tax-related items related to the Grantee’s participation in the Plan and legally applicable or deemed applicable to the Grantee (“Tax-Related Items”) is and remains the Grantee’s responsibility and may exceed the amount, if any, actually withheld by the Company. The Grantee further acknowledges that the Company (i) make no representations or undertakings regarding the treatment of any Tax-Related Items in connection with any aspect of the Restricted Stock Units or the underlying shares of Stock, including, but not limited to, the grant, vesting or settlement of the Restricted Stock Units, the subsequent sale of shares of Stock acquired pursuant to such settlement and receipt of any dividends; and (ii) do not commit to and are under no obligation to structure the terms of the grant or any aspect of the Restricted Stock Units to reduce or eliminate the Grantee’s liability for Tax-Related Items or to achieve any particular tax result. Further, if the Grantee is subject to Tax-Related Items in more than one jurisdiction, the Grantee acknowledges that the Company may be required to withhold or account for Tax-Related Items in more than one jurisdiction.
(b) In connection with any relevant taxable or tax withholding event, as applicable, the Grantee agrees to make adequate arrangements satisfactory to the Company to satisfy all Tax-Related Items. In this regard, the Grantee authorizes the Company, or its agents, at the Company's discretion, to satisfy any applicable withholding obligations or rights with regard to all Tax-Related Items by one or a combination of the following: (i) requiring the Grantee to make a payment in a form acceptable to the Company; (ii) withholding from the Grantee’s other compensation payable to the Grantee (if any), (iii) withholding from proceeds of the sale of shares of Stock acquired upon settlement of the Restricted Stock Units either through a voluntary sale or through a mandatory sale arranged by the Company (on the Grantee’s behalf pursuant to this authorization without further consent), (iv) withholding shares of Stock to be issued upon
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settlement of the Restricted Stock Units, or (v) any other method of withholding determined by the Company to be permitted by applicable law.
(c) The Company may withhold or account for Tax-Related Items by considering statutory or other withholding rates, including maximum rates applicable in the Grantee’s jurisdiction. In the event of over-withholding, the Grantee may receive a refund from the Company of any over-withheld amount in cash (with no entitlement to the equivalent in shares of Stock), or if not refunded by the Company, the Grantee may seek a refund from local tax authorities to the extent the Grantee wishes to recover the over-withheld amount in the form of a refund. In the event of under-withholding, the Grantee may be required to pay any additional Tax-Related Items directly to the applicable tax authority or to the Company. If the obligation for Tax-Related Items is satisfied by withholding shares of Stock, for tax purposes, the Grantee will be deemed to have been issued the full number of shares of Stock subject to the vested Restricted Stock Units, notwithstanding that a number of shares of Stock is held back solely for the purpose of paying the Tax Related Items.
(d) Finally, the Grantee agrees to pay to the Company any amount of Tax-Related Items that the Company may be required to withhold or account for as a result of the Grantee’s participation in the Plan that cannot be satisfied by the means previously described. The Company may refuse to issue or deliver the underlying shares of Stock or the proceeds from the sale of the shares of Stock if the Grantee fails to comply with his or her obligations in connection with the Tax-Related Items.
7. Nature of Grant. In accepting the Restricted Stock Units, the Grantee acknowledges, understands and agrees that:
(a) the Plan is established voluntarily by the Company, it is discretionary in nature, and may be modified, amended, suspended or terminated by the Company at any time, to the extent permitted under the Plan;
(b) the grant of the Restricted Stock Units is exceptional, voluntary and occasional and does not create any contractual or other right to receive future grants of Restricted Stock Units, or benefits in lieu of Restricted Stock Units, even if Restricted Stock Units have been granted in the past;
(c) all decisions with respect to future Restricted Stock Units or other grants, if any, will be at the sole discretion of the Company;
(d) the Grantee is voluntarily participating in the Plan;
(e) the future value of the underlying shares of Stock is unknown, indeterminable, and cannot be predicted with certainty;
(f) no claim or entitlement to compensation or damages shall arise from forfeiture of the Restricted Stock Units resulting from the termination of the Grantee’s service with the Company;
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(g) unless otherwise provided in the Plan or by the Company in its discretion, the Restricted Stock Units and the benefits evidenced by this Agreement do not create any entitlement to have the Restricted Stock Units or any such benefits transferred to, or assumed by, another company, nor to be exchanged, cashed out or substituted for, in connection with any corporate transaction affecting the shares of Stock; and
(h) neither the Company nor any Affiliate shall be liable for any foreign exchange rate fluctuation between the Grantee’s local currency and the United States Dollar that may affect the value of the Restricted Stock Units or of any amounts due to the Grantee pursuant to the settlement of the Restricted Stock Units or the subsequent sale of shares of Stock acquired upon settlement.
8. No Advice Regarding Grant. The Company is not providing any tax, legal or financial advice, nor is the Company making recommendations regarding the Grantee’s participation in the Plan or the Grantee’s acquisition or sale of the underlying shares of Stock. The Grantee understands and agrees that the Grantee should consult with his or her own personal tax, legal and financial advisors regarding the Grantee’s participation in the Plan before taking any action related to the Plan.
9. Data Privacy Consent.
(a) Data Collection and Usage. The Company collects, processes and uses certain personal information about the Grantee, including, but not limited to, the Grantee’s name, home address, telephone number, email address, date of birth, social insurance number, passport or other identification number, nationality any shares of Stock held in the Company, details of all Restricted Stock Units granted under the Plan or any other entitlement to shares of Stock awarded, canceled, exercised, vested, unvested or outstanding in the Grantee’s favor (“Data”), for the legitimate purpose of implementing, administering and managing the Plan. Where required, the legal basis for the collection and processing of Data is the Grantee’s consent.
(b) Stock Plan Administration and Service Providers. The Grantee understands that the Company transfers Data to Fidelity Stock Plan Services, a third-party stock plan administrator/broker (together with certain of its affiliates, the “Service Provider”), which assists the Company with the implementation, administration and management of the Plan. The Grantee may be asked to agree on separate terms and data processing practices with the Service Provider, with such agreement being a condition to the ability to participate in the Plan. Where required, the legal basis for the transfer of Data to the Service Provider is the Grantee’s consent.
(c) International Data Transfers. The Grantee’s country or jurisdiction may have different data privacy laws and protections than the country(ies) where the Data will be stored, and foreign courts, law enforcement, regulators and national security authorities may be able to access the Data. The Company’s legal basis, where required, for the international transfer of Data is the Grantee’s consent.
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(d) Data Retention. The Company will hold and use Data only as long as is necessary to implement, administer and manage the Grantee’s participation in the Plan, or as required to comply with legal or regulatory obligations, including under tax, exchange control, securities and labor laws. This may mean Data is retained after the Grantee’s service with the Company ends, plus any additional time periods necessary for compliance with law, exercise or defense of legal rights, archiving, back-up and deletion purposes.
(e) Voluntariness and Consequences of Consent Denial or Withdrawal. Participation in the Plan is voluntary and the Grantee is providing the consents herein on a voluntary basis. The Grantee understands that the Grantee may refuse the collection of the Data or request to stop the transfer and processing of the Data and that the Grantee’s service with the Company will not be affected. The Grantee understands that the only consequence of refusing or withdrawing consent is that the Company may not be able to continue to facilitate the Grantee’s participation in the Plan.
(f) Data Subject Rights. The Grantee may have a number of rights under data privacy laws in the Grantee’s jurisdiction. Depending on where the Grantee is based, such rights may include the right to (specifically in respect of the Grantee’s Data): (i) request access to or copies of Data held by the Company, (ii) request that inaccurate or incomplete Data be rectified, (iii) request that Data be deleted, (iv) request that the processing of Data be restricted to certain purposes, (v) request that the transfer of Data be restricted to certain purposes, (vi) lodge complaints with competent authorities in the Grantee’s jurisdiction, and/or (vii) receive a list with the names and addresses of any potential third party recipients or transferees of Data. To receive clarification regarding the availability of these rights, to exercise these rights or to otherwise inquire about the Company’s collection, use or transfer of Data, the Grantee can contact the Company.
10. Section 409A of the Code. This Agreement shall be interpreted in such a manner that all provisions relating to the settlement of the Award are exempt from the requirements of Section 409A of the Code as “short-term deferrals” as described in Section 409A of the Code.
11. No Right to Continue Service as a Director. The grant of the Restricted Stock Units does not confer any rights on the Grantee to remain in service as a Director.
12. Integration. This Agreement constitutes the entire agreement between the parties with respect to this Award and supersedes all prior agreements and discussions between the parties concerning such subject matter.
13. Governing Law/Venue. This Award and the terms and conditions of this Agreement and all determinations made and actions taken pursuant hereto shall be governed by, and construed in accordance with, the General Corporation Law of the State of Delaware as to matters within the scope thereof, and as to all other matters shall be governed by and construed in accordance with the internal laws of the Commonwealth of Massachusetts, applied without regard to conflict of law principles. Any and all disputes relating to, concerning or arising from this Agreement, or relating to, concerning or arising from the relationship between the parties evidenced by the Restricted Stock Units or this Agreement, shall be brought and heard
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exclusively in the United States District Court for the District of New Delaware or the Delaware Superior Court, New Castle County. Each of the parties hereby represents and agrees that such party is subject to the personal jurisdiction of said courts; hereby irrevocably consents to the jurisdiction of such courts in any legal or equitable proceedings related to, concerning or arising from such dispute, and waives, to the fullest extent permitted by law, any objection which such party may now or hereafter have that the laying of the venue of any legal or equitable proceedings related to, concerning or arising from such dispute which is brought in such courts is improper or that such proceedings have been brought in an inconvenient forum.
14. Compliance with Law. Notwithstanding any other provision in the Plan or this Agreement, unless there is an available exemption from registration, qualification or other legal requirement applicable to the shares of Stock, the Company shall not be required to permit the vesting of the Award and/or deliver any shares of Stock prior to the completion of any registration or qualification of the shares of Stock under any U.S. or non-U.S. local, state or federal securities, exchange control or other applicable law or under rulings or regulations of the U.S. Securities and Exchange Commission (“SEC”) or of any other governmental regulatory body, or prior to obtaining any approval or other clearance from any U.S. or non-U.S. local, state or federal governmental agency, which registration, qualification or approval the Company shall, in its absolute discretion, deem necessary or advisable. The Grantee understands that the Company is under no obligation to register or qualify the shares of Stock with the SEC or any state or non-U.S. securities commission or to seek approval or clearance from any governmental authority for the issuance or sale of the shares of Stock subject to this Award. Further, the Grantee agrees that the Company shall have unilateral authority to amend this Agreement without the Grantee’s consent to the extent necessary to comply with securities or other laws applicable to the issuance of shares of Stock subject to this Award.
15. Insider Trading Restrictions/Market Abuse Laws. The Grantee acknowledges that, the Grantee may be subject to insider trading restrictions and/or market abuse laws in applicable jurisdictions, including but not limited to Canada, the Grantee’s country, the Service Provider’s country and the country or country in which the shares of Stock are or may be listed, which may affect his or her ability, directly or indirectly, to acquire, sell or attempt to sell or otherwise dispose of shares of Stock or rights to shares of Stock (e.g., Restricted Stock Units), under the Plan during such times as the Grantee is considered to have “inside information” regarding the Company (as defined by laws in the applicable jurisdiction(s)). Furthermore, the Grantee understands that he or she may be prohibited from (i) disclosing the inside information to any third party, including employees, and (ii) “tipping” third parties by sharing with them Company inside information, or otherwise causing third parties to buy or sell Company securities. Any restrictions under these laws or regulations are separate from and in addition to any restrictions that may be imposed under any applicable Company insider trading policy. The Grantee acknowledges that it is his or her responsibility to comply with any applicable restrictions as well as any applicable Company insider trading policy, and the Grantee should consult with his or her personal legal advisor on this matter.
16. Exchange Control, Foreign Asset/Account and/or Tax Requirements. The Grantee acknowledges that there may be certain foreign asset and/or account reporting requirements
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which may affect the Grantee’s ability to acquire or hold shares of Stock or cash received from participating in the Plan (including from any dividends paid on shares of Stock or sale proceeds arising from the sale of shares of Stock) in a brokerage or bank account outside the Grantee’s country. The Grantee may be required to report such accounts, assets, or transactions to the tax or other authorities in the Grantee’s country. The Grantee may also be required to repatriate sale proceeds or other funds received as a result of participating in the Plan to the Grantee’s country through a designated bank or broker and/or within a certain time after receipt. The Grantee acknowledges that he or she may be subject to tax payment and/or reporting obligations as the result of participating in the Plan and/or the sale of shares of Stock acquired under the Plan. The Grantee further acknowledges that it is his or her responsibility to comply with such requirements and that the Grantee should speak with his or her personal tax, legal and financial advisors on this matter.
17. Electronic Delivery and Participation. The Company may, in its sole discretion, decide to deliver any documents related to current or future participation in the Plan by electronic means. The Grantee hereby consents to receive such documents by electronic delivery and agrees to participate in the Plan through an on-line electronic system established and maintained by the Company or a third party designated by the Company.
18. Language. The Grantee acknowledges that he or she is sufficiently proficient in English or has consulted with an advisor who is sufficiently proficient in English so as to allow the Grantee to understand the terms and conditions of this Agreement. If the Grantee has received this Agreement or any other document related to the Plan translated into a language other than English and if the meaning of the translated version is different than the English version, the English version will control, unless otherwise required by applicable law.
19. Severability. The provisions of this Agreement are severable and if any one or more provisions are determined to be illegal or otherwise unenforceable, in whole or in part, the remaining provisions shall nevertheless be binding and enforceable.
20. Appendix. Notwithstanding any provisions in this Global Restricted Stock Unit Award Agreement, the Restricted Stock Units shall be subject to any additional terms and conditions for the Grantee’s country set forth in the Appendix attached hereto. Moreover, if the Grantee relocates to one of the countries included in the Appendix, the additional terms and conditions for such country, if any, will apply to the Grantee, to the extent the Company determines that the application of such terms and conditions is necessary or advisable for legal or administrative reasons. The Appendix constitutes part of this Agreement.
21. Imposition of Other Requirements. The Company reserves the right to impose other requirements on the Grantee’s participation in the Plan, on the Restricted Stock Units and on the shares of Stock acquired upon settlement of the Restricted Stock Units, to the extent the Company determines it is necessary or advisable for legal or administrative reasons, and to require the Grantee to sign any additional agreements or undertakings that may be necessary to accomplish the foregoing.
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22. Waiver. The Grantee acknowledges that a waiver by the Company of breach of any provisions of this Agreement shall not operate or be construed as a waiver of any other provision of this Agreement, or of any subsequent breach by the Grantee or any other grantee.
23. Notices. Notices hereunder shall be mailed or delivered to the Company at its principal place of business and shall be mailed or delivered to the Grantee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing.

KLAVIYO, INC.
By: |
| Title:

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The foregoing Agreement (including the Appendix) is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned. Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Grantee (including through an online acceptance process) is acceptable.

Dated: |  |  |
|  |  | Grantee’s Signature
|  |  | Grantee’s name and address:

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APPENDIX TO
GLOBAL RESTRICTED STOCK UNIT AWARD AGREEMENT
UNDER KLAVIYO, INC.
2023 STOCK OPTION AND INCENTIVE PLAN
Capitalized terms, unless explicitly defined in this Appendix to the Global Restricted Stock Unit Award Agreement (the “RSU Agreement”), shall have the meanings given to them in the RSU Agreement or in the Plan.
Terms and Conditions
This Appendix includes additional terms and conditions that govern the Restricted Stock Units if the Grantee resides and/or works in one of the countries listed below. If the Grantee is a citizen or resident (or is considered as such for local law purposes) of a country other than the country in which the Grantee is currently residing, or if the Grantee transfers to another country after the grant of the Restricted Stock Units, the Company shall, in its discretion, determine to what extent the additional terms and conditions contained herein shall be applicable to the Grantee.
Notifications
The Appendix also includes information regarding securities, exchange control, tax and certain other issues of which the Grantee should be aware with respect to the Grantee’s participation in the Plan. The information is based on the securities, exchange control, tax and other laws in effect in the respective countries as of August 2023. Such laws are often complex and change frequently. As a result, the Company strongly recommends that the Grantee not rely on the information contained herein as the only source of information relating to the consequences of the Grantee’s participation in the Plan because the information may be out of date at the time of vesting of the Restricted Stock Units, at the time of issuance of shares of Stock under the Plan or at the time of the sale of such shares of Stock. In addition, the information is general in nature and may not apply to the Grantee’s particular situation, and the Company is not in a position to assure the Grantee of any particular result; therefore, the Grantee is advised to seek appropriate professional advice as to how the relevant laws in the Grantee’s country may apply to the Grantee’s individual situation.
If the Grantee is a citizen or resident (or is considered as such for local tax purposes) of a country other than the country in which the Grantee is currently residing, or if the Grantee transfers to another country after the grant of the Restricted Stock Units, the notifications contained herein may not be applicable to the Grantee in the same manner.
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UNITED KINGDOM
There are no country-specific terms.
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Attachment 1
Vesting Schedule

Incremental Number of Restricted Stock Units Vested | Vesting Date
_____________ (___%) | _______________
_____________ (___%) | _______________
_____________ (___%) | _______________
_____________ (___%) | _______________

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