Document:

EX-10.3

 Exhibit 10.3 

 

HILLEVAX, INC. 

2022 EMPLOYEE STOCK PURCHASE PLAN 

ARTICLE I. 
 PURPOSE

 The purpose of this Plan is to assist Eligible Employees of the Company and its Designated Subsidiaries in acquiring
a stock ownership interest in the Company. 
 The Plan consists of two components: (i) the Section 423 Component
and (ii) the Non-Section 423 Component. The Section 423 Component is intended to qualify as an “employee stock purchase plan” under Section 423 of the Code and shall be administered,
interpreted and construed in a manner consistent with the requirements of Section 423 of the Code. The Non-Section 423 Component authorizes the grant of rights which need not qualify as rights granted
pursuant to an “employee stock purchase plan” under Section 423 of the Code. Rights granted under the Non-Section 423 Component shall be granted pursuant to separate Offerings containing such sub-plans, appendices, rules or procedures as may be adopted by the Administrator and designed to achieve tax, securities laws or other objectives for Eligible Employees and Designated Subsidiaries but shall not be
intended to qualify as an “employee stock purchase plan” under Section 423 of the Code. Except as otherwise determined by the Administrator or provided herein, the Non-Section 423 Component will
operate and be administered in the same manner as the Section 423 Component. Offerings intended to be made under the Non-Section 423 Component will be designated as such by the Administrator at or prior
to the time of such Offering. 
 For purposes of this Plan, the Administrator may designate separate Offerings under the
Plan in which Eligible Employees will participate. The terms of these Offerings need not be identical, even if the dates of the applicable Offering Period(s) in each such Offering are identical, provided that the terms of participation are the same
within each separate Offering under the Section 423 Component (as determined under Section 423 of the Code). Solely by way of example and without limiting the foregoing, the Company could, but shall not be required to, provide for
simultaneous Offerings under the Section 423 Component and the Non-Section 423 Component of the Plan. 

ARTICLE II. 
 DEFINITIONS
AND CONSTRUCTION 
 Wherever the following terms are used in the Plan they shall have the meanings specified below,
unless the context clearly indicates otherwise. 
 2.1 “Administrator” means the entity that conducts
the general administration of the Plan as provided in Article XI. 
 2.2 “Agent” means the
brokerage firm, bank or other financial institution, entity or person(s), if any, engaged, retained, appointed or authorized to act as the agent of the Company or an Employee with regard to the Plan. 

2.3 “Applicable Law” means the requirements relating to the administration of equity incentive plans
under U.S. federal and state securities, tax and other applicable laws, rules and regulations, the applicable rules of any stock exchange or quotation system on which Shares are listed or quoted and the applicable laws and rules of any foreign
country or other jurisdiction where rights under this Plan are granted. 
 2.4 “Board” means the
Board of Directors of the Company. 

 2.5 “Code” means the U.S. Internal Revenue Code of
1986, as amended, and the regulations issued thereunder. 
 2.6 “Common Stock” means common stock of
the Company and such other securities of the Company that may be substituted therefore. 
 2.7
“Company” means HilleVax, Inc., a Delaware corporation, or any successor. 
 2.8
“Compensation” of an Eligible Employee means, unless otherwise determined by the Administrator, the gross base compensation or wages received by such Eligible Employee as compensation for services to the Company or any
Designated Subsidiary, excluding overtime payments, sales commissions, incentive compensation, bonuses, expense reimbursements, income received in connection with any compensatory equity awards, fringe benefits and other special payments. 

2.9 “Designated Subsidiary” means any Subsidiary designated by the Administrator in accordance with
Section 11.2(b), such designation to specify whether such participation is in the Section 423 Component or Non-Section 423 Component. A Designated Subsidiary may participate in either the
Section 423 Component or Non-Section 423 Component, but not both; provided that a Subsidiary that, for U.S. tax purposes, is disregarded from the Company or any Subsidiary that participates in the
Section 423 Component shall automatically constitute a Designated Subsidiary that participates in the Section 423 Component. 

2.10 “Effective Date” means the Pricing Date, provided that the Board has adopted the
Plan prior to or on such date. 
 2.11 “Eligible Employee” means: 

(a) An Employee who does not, immediately after any rights under this Plan are granted, own (directly or through attribution)
stock possessing 5% or more of the total combined voting power or value of all classes of Shares and other securities of the Company, a Parent or a Subsidiary (as determined under Section 423(b)(3) of the Code). For purposes of the foregoing,
the rules of Section 424(d) of the Code with regard to the attribution of stock ownership shall apply in determining the stock ownership of an individual, and stock that an Employee may purchase under outstanding options shall be treated as
stock owned by the Employee. 
 (b) Notwithstanding the foregoing, the Administrator may provide in an Offering Document that
an Employee shall not be eligible to participate in an Offering Period under the Section 423 Component if: (i) such Employee is a highly compensated employee within the meaning of Section 423(b)(4)(D) of the Code; (ii) such
Employee has not met a service requirement designated by the Administrator pursuant to Section 423(b)(4)(A) of the Code (which service requirement may not exceed two (2) years); (iii) such Employee’s customary employment is for twenty
(20) hours per week or less; (iv) such Employee’s customary employment is for less than five (5) months in any calendar year; and/or (v) such Employee is a citizen or resident of a foreign jurisdiction and the grant of a
right to purchase Shares under the Plan to such Employee would be prohibited under the laws of such foreign jurisdiction or the grant of a right to purchase Shares under the Plan to such Employee in compliance with the laws of such foreign
jurisdiction would cause the Plan to violate the requirements of Section 423 of the Code, as determined by the Administrator in its sole discretion; provided, further, that any exclusion in clauses (i), (ii), (iii), (iv) or
(v) shall be applied in an identical manner under each Offering Period to all Employees, in accordance with Treas. Reg. Section 1.423-2(e). 

  
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 (c) Further notwithstanding the foregoing, with respect to the Non-Section 423 Component, the first sentence in this definition shall apply in determining who is an “Eligible Employee,” except (i) the Administrator may limit eligibility further within the Company
or a Designated Subsidiary so as to only designate some Employees of the Company or a Designated Subsidiary as Eligible Employees, and (ii) to the extent the restrictions in the first sentence in this definition are not consistent with
applicable local laws, the applicable local laws shall control. 
 2.12 “Employee” means any
individual who renders services to the Company or any Designated Subsidiary in the status of an employee, and, with respect to the Section 423 Component, a person who is an employee within the meaning of Section 3401(c) of the Code. For
purposes of an individual’s participation in, or other rights under the Plan, all determinations by the Company shall be final, binding and conclusive, notwithstanding that any court of law or governmental agency subsequently makes a contrary
determination. For purposes of the Plan, the employment relationship shall be treated as continuing intact while the individual is on sick leave or other leave of absence approved by the Company or Designated Subsidiary and meeting the requirements
of Treas. Reg. Section 1.421-1(h)(2). Where the period of leave exceeds three (3) months and the individual’s right to reemployment is not guaranteed either by statute or by contract, the
employment relationship shall be deemed to have terminated on the first day immediately following such three (3)-month period. 

2.13 “Enrollment Date” means the first Trading Day of each Offering Period; provided that, the
Enrollment Date for the Initial Offering Period shall be the Pricing Date. 
 2.14 “Fair Market
Value” means, as of any date, the value of Shares determined as follows: (i) if the Shares are listed on any established stock exchange, its Fair Market Value will be the closing sales price for such Shares as quoted on such
exchange for such date, or if no sale occurred on such date, the last day preceding such date during which a sale occurred, as reported in The Wall Street Journal or another source the Administrator deems reliable; (ii) if the Shares are not
traded on a stock exchange but are quoted on a national market or other quotation system, the closing sales price on such date, or if no sales occurred on such date, then on the last date preceding such date during which a sale occurred, as reported
in The Wall Street Journal or another source the Administrator deems reliable; (iii) without an established market for the Shares, the Administrator will determine the Fair Market Value in its discretion; or (iv) with respect to the
Initial Offering Period, the Fair Market Value as specified in the Offering Document approved by the Administrator with respect to the Initial Offering Period. 

2.15 “Initial Offering Period” means the period commencing on the Pricing Date and ending on the date
set forth in the Offering Document approved by the Administrator with respect to the Initial Offering Period. 
 2.16
“Non-Section 423 Component” means those Offerings under the Plan, together with the sub-plans, appendices, rules or procedures, if any, adopted
by the Administrator as a part of this Plan, in each case, pursuant to which rights to purchase Shares during an Offering Period may be granted to Eligible Employees that need not satisfy the requirements for rights to purchase Shares granted
pursuant to an “employee stock purchase plan” that are set forth under Section 423 of the Code. 
 2.17
“Offering” means an offer under the Plan of a right to purchase Shares that may be exercised during an Offering Period as further described in Article IV hereof. Unless otherwise specified by the Administrator, each Offering
to the Eligible Employees of the Company or a Designated Subsidiary shall be deemed a separate Offering, even if the dates and other terms of the applicable Offering Periods of each such Offering are identical, and the provisions of the Plan will
separately apply to each Offering. To the extent permitted by Treas. Reg. Section 1.423-2(a)(1), the terms of each separate Offering under the Section 423 Component need not be identical, provided
that the terms of the Section 423 Component and an Offering thereunder together satisfy Treas. Reg. Section 1.423-2(a)(2) and (a)(3). 

  
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 2.18 “Offering Document” has the meaning given to
such term in Section 4.1. 
 2.19 “Offering Period” has the meaning given to such term in
Section 4.1. 
 2.20 “Parent” means any corporation, other than the Company, in an unbroken
chain of corporations ending with the Company if, at the time of the determination, each of the corporations other than the Company owns stock possessing 50% or more of the total combined voting power of all classes of stock in one of the other
corporations in such chain. 
 2.21 “Participant” means any Eligible Employee who has executed a
subscription agreement and been granted rights to purchase Shares pursuant to the Plan (or, with respect to the Initial Offering Period, those Participants specified in the Offering Document approved by the Administrator with respect to the Initial
Offering Period). 
 2.22 “Payday” means the regular and recurring established day for payment of
Compensation to an Employee of the Company or any Designated Subsidiary. 
 2.23 “Plan” means this
2022 Employee Stock Purchase Plan, including both the Section 423 Component and Non-Section 423 Component and any other sub-plans or appendices hereto, as amended
from time to time. 
 2.24 “Pricing Date” means the date upon which the Company’s
Registration Statement on Form S-1 filed with the Securities and Exchange Commission relating to the underwritten public offering of shares of Common Stock becomes effective. 

2.25 “Purchase Date” means the last Trading Day of each Purchase Period or such other date as
determined by the Administrator and set forth in the Offering Document. 
 2.26 “Purchase Period”
shall refer to one or more periods within an Offering Period, as designated in the applicable Offering Document; provided, however, that, in the event no Purchase Period is designated by the Administrator in the applicable Offering
Document, the Purchase Period for each Offering Period covered by such Offering Document shall be the same as the applicable Offering Period. 

2.27 “Purchase Price” means the purchase price designated by the Administrator in the applicable
Offering Document (which purchase price, for purposes of the Section 423 Component, shall not be less than 85% of the Fair Market Value of a Share on the Enrollment Date or on the Purchase Date, whichever is lower); provided,
however, that, in the event no purchase price is designated by the Administrator in the applicable Offering Document, the purchase price for the Offering Periods covered by such Offering Document shall be 85% of the Fair Market Value of a
Share on the Enrollment Date or on the Purchase Date, whichever is lower; provided, further, that the Purchase Price may be adjusted by the Administrator pursuant to Article VIII and shall not be less than the par value of a
Share. 
 2.28 “Section 423 Component” means those Offerings under
the Plan, together with the sub-plans, appendices, rules or procedures, if any, adopted by the Administrator as a part of this Plan, in each case, pursuant to which rights to purchase Shares during an Offering
Period may be granted to Eligible Employees that are intended to satisfy the requirements for rights to purchase Shares granted pursuant to an “employee stock purchase plan” that are set forth under Section 423 of the Code. 

  
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 2.29 “Securities Act” means the U.S. Securities Act
of 1933, as amended. 
 2.30 “Share” means a share of Common Stock. 

2.31 “Subsidiary” means any corporation, other than the Company, in an unbroken chain of corporations
beginning with the Company if, at the time of the determination, each of the corporations other than the last corporation in an unbroken chain owns stock possessing 50% or more of the total combined voting power of all classes of stock in one of the
other corporations in such chain; provided, however, that a limited liability company or partnership may be treated as a Subsidiary to the extent either (a) such entity is treated as a disregarded entity under Treas. Reg. Section 301.7701-3(a) by reason of the Company or any other Subsidiary that is a corporation being the sole owner of such entity, or (b) such entity elects to be classified as a corporation under Treas.
Reg. Section 301.7701-3(a) and such entity would otherwise qualify as a Subsidiary. In addition, with respect to the Non-Section 423 Component, Subsidiary shall
include any corporate or non-corporate entity in which the Company has a direct or indirect equity interest or significant business relationship that constitutes a “parent” or “subsidiary”
of the Company for purposes of Form S-8 of the Securities Act and whose employees are eligible to be offered securities registrable on Form S-8 of the Securities Act.

 2.32 “Trading Day” means a day on which national stock exchanges in the United States are open for
trading. 
 2.33 “Treas. Reg.” means U.S. Department of the Treasury regulations. 

ARTICLE III. 
 SHARES
SUBJECT TO THE PLAN 
 3.1 Number of Shares. Subject to Article VIII, the aggregate number of Shares that
may be issued pursuant to rights granted under the Plan shall be 410,000 Shares. In addition to the foregoing, subject to Article VIII, on the first day of each calendar year beginning on January 1, 2023 and ending on and including
January 1, 2032, the number of Shares available for issuance under the Plan shall be increased by that number of Shares equal to the lesser of (a) 1% of the aggregate number of shares of Common Stock of the Company outstanding on the final day
of the immediately preceding calendar year and (b) such smaller number of Shares as determined by the Board. If any right granted under the Plan shall for any reason terminate without having been exercised, the Shares not purchased under such
right shall again become available for issuance under the Plan. Notwithstanding anything in this Section 3.1 to the contrary, the number of Shares that may be issued or transferred pursuant to the rights granted under the Section 423
Component of the Plan shall not exceed an aggregate of 10,000,000 Shares, subject to Article VIII. 
 3.2 Shares
Distributed. Any Shares distributed pursuant to the Plan may consist, in whole or in part, of authorized and unissued Shares, treasury shares or Shares purchased on the open market. 

ARTICLE IV. 
 OFFERING
PERIODS; OFFERING DOCUMENTS; PURCHASE DATES 
 4.1 Offering Periods. The Administrator may from time to time
grant or provide for the grant of rights to purchase Shares under the Plan to Eligible Employees during one or more periods (each, an “Offering Period”) selected by the Administrator. The terms and conditions applicable to
each Offering Period shall be set forth in an “Offering Document” adopted by the Administrator, which Offering Document shall be in such form and shall contain such terms and conditions as the Administrator shall deem
appropriate and shall be incorporated by reference into and made part of the Plan and shall be attached hereto as part of the Plan. The Administrator shall establish in each Offering Document one or more Purchase Periods during such Offering Period
during which rights granted under the Plan shall be exercised and purchases of Shares carried out during such Offering Period in accordance with such Offering Document and the Plan. The provisions of separate Offerings or Offering Periods under the
Plan need not be identical. 

  
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 4.2 Offering Documents. Each Offering Document with respect to an
Offering Period shall specify (through incorporation of the provisions of this Plan by reference or otherwise): 
 (a) the
length of the Offering Period, which period shall not exceed twenty-seven (27) months; 
 (b) the length of the Purchase
Period(s) within the Offering Period; 
 (c) the maximum number of Shares that may be purchased by any Eligible Employee
during such Offering Period, which, in the absence of a contrary designation by the Administrator, shall be 100,000 Shares; 

(d) in connection with each Offering Period that contains more than one Purchase Period, the maximum aggregate number of shares
which may be purchased by any Eligible Employee during each Purchase Period, which, in the absence of a contrary designation by the Administrator, shall be 100,000 Shares; and 

(e) such other provisions as the Administrator determines are appropriate, subject to the Plan. 

ARTICLE V. 
 ELIGIBILITY
AND PARTICIPATION 
 5.1 Eligibility. Any Eligible Employee who shall be employed by the Company or a Designated
Subsidiary on a given Enrollment Date for an Offering Period shall be eligible to participate in the Plan during such Offering Period, subject to the requirements of this Article V and, for the Section 423 Component, the limitations
imposed by Section 423(b) of the Code. 
 5.2 Enrollment in Plan. 

(a) Except as otherwise set forth in an Offering Document or determined by the Administrator, an Eligible Employee may become a
Participant in the Plan for an Offering Period by delivering a subscription agreement to the Company by such time prior to the Enrollment Date for such Offering Period (or such other date specified in the Offering Document) designated by the
Administrator and in such form as the Company provides. 
 (b) Except as otherwise determined by the Administrator, each
subscription agreement shall designate a whole percentage of such Eligible Employee’s Compensation to be withheld by the Company or the Designated Subsidiary employing such Eligible Employee on each Payday during the Offering Period as payroll
deductions under the Plan. The percentage of Compensation designated by an Eligible Employee may not be less than 1% and may not be more than the maximum percentage specified by the Administrator in the applicable Offering Document (which percentage
shall be 20% in the absence of any such designation) as payroll deductions. The payroll deductions made for each Participant shall be credited to an account for such Participant under the Plan and shall be deposited with the general funds of the
Company. 

  
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 (c) A Participant may increase or decrease the percentage of Compensation
designated in his or her subscription agreement, subject to the limits of this Section 5.2, or may suspend his or her payroll deductions, at any time during an Offering Period; provided, however, that the Administrator may limit
the number of changes a Participant may make to his or her payroll deduction elections during each Offering Period in the applicable Offering Document (and in the absence of any specific designation by the Administrator, a Participant shall be
allowed to decrease (but not increase) his or her payroll deduction elections one time during each Offering Period). Any such change or suspension of payroll deductions shall be effective with the first full payroll period following five
(5) business days after the Company’s receipt of the new subscription agreement (or such shorter or longer period as may be specified by the Administrator in the applicable Offering Document). In the event a Participant suspends his or her
payroll deductions, such Participant’s cumulative payroll deductions prior to the suspension shall remain in his or her account and shall be applied to the purchase of Shares on the next occurring Purchase Date and shall not be paid to such
Participant unless he or she withdraws from participation in the Plan pursuant to Article VII. 
 (d) Except as
otherwise set forth in an Offering Document or determined by the Administrator, a Participant may participate in the Plan only by means of payroll deduction and may not make contributions by lump sum payment for any Offering Period. 

5.3 Payroll Deductions. Except as otherwise provided in the applicable Offering Document or determined by the
Administrator, payroll deductions for a Participant shall commence on the first Payday following the Enrollment Date and shall end on the last Payday in the Offering Period to which the Participant’s authorization is applicable, unless sooner
terminated by the Participant as provided in Article VII or suspended by the Participant or the Administrator as provided in Section 5.2 and Section 5.6, respectively. Notwithstanding any other provisions of the Plan to the contrary,
in non-U.S. jurisdictions where participation in the Plan through payroll deductions is prohibited, the Administrator may provide that an Eligible Employee may elect to participate through contributions to the
Participant’s account under the Plan in a form acceptable to the Administrator in lieu of or in addition to payroll deductions; provided, however, that, for any Offering under the Section 423 Component, the Administrator shall take into
consideration any limitations under Section 423 of the Code when applying an alternative method of contribution. 
 5.4
Effect of Enrollment. A Participant’s completion of a subscription agreement will enroll such Participant in the Plan for each subsequent Offering Period on the terms contained therein until the Participant either submits a new
subscription agreement, withdraws from participation under the Plan as provided in Article VII or otherwise becomes ineligible to participate in the Plan. 

5.5 Limitation on Purchase of Shares. An Eligible Employee may be granted rights under the Section 423
Component only if such rights, together with any other rights granted to such Eligible Employee under “employee stock purchase plans” of the Company, any Parent or any Subsidiary, as specified by Section 423(b)(8) of the Code, do not
permit such employee’s rights to purchase stock of the Company or any Parent or Subsidiary to accrue at a rate that exceeds $25,000 of the fair market value of such stock (determined as of the first day of the Offering Period during which such
rights are granted) for each calendar year in which such rights are outstanding at any time. This limitation shall be applied in accordance with Section 423(b)(8) of the Code. 

5.6 Suspension of Payroll Deductions. Notwithstanding the foregoing, to the extent necessary to comply with
Section 423(b)(8) of the Code and Section 5.5 (with respect to the Section 423 Component) or the other limitations set forth in this Plan, a Participant’s payroll deductions may be suspended by the Administrator at any time
during an Offering Period. The balance of the amount credited to the account of each Participant that has not been applied to the purchase of Shares by reason of Section 423(b)(8) of the Code, Section 5.5 or the other limitations set forth
in this Plan shall be paid to such Participant in one lump sum in cash as soon as reasonably practicable after the Purchase Date. 

  
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 5.7 Foreign Employees. In order to facilitate participation in the
Plan, the Administrator may provide for such special terms applicable to Participants who are citizens or residents a foreign jurisdiction, or who are employed by a Designated Subsidiary outside of the United States, as the Administrator may
consider necessary or appropriate to accommodate differences in local law, tax policy or custom. Except as permitted by Section 423 of the Code, with respect to the Section 423 Component, such special terms may not be more favorable than
the terms of rights granted under the Section 423 Component to Eligible Employees who are residents of the United States. Such special terms may be set forth in an addendum to the Plan in the form of an appendix or sub-plan (which appendix or sub-plan may be designed to govern Offerings under the Section 423 Component or the Non-Section 423
Component, as determined by the Administrator). To the extent that the terms and conditions set forth in an appendix or sub-plan conflict with any provisions of the Plan, the provisions of the appendix or sub-plan shall govern. The adoption of any such appendix or sub-plan shall be pursuant to Section 11.2(g). Without limiting the foregoing, the Administrator is
specifically authorized to adopt rules and procedures, with respect to Participants who are foreign nationals or employed in non-U.S. jurisdictions, regarding the exclusion of particular Subsidiaries from
participation in the Plan, eligibility to participate, the definition of Compensation, handling of payroll deductions or other contributions by Participants, payment of interest, conversion of local currency, data privacy security, payroll tax,
withholding procedures, establishment of bank or trust accounts to hold payroll deductions or contributions. 
 ARTICLE VI. 

GRANT AND EXERCISE OF RIGHTS 

6.1 Grant of Rights. On the Enrollment Date of each Offering Period, each Eligible Employee participating in such
Offering Period shall be granted a right to purchase the maximum number of Shares specified under Section 4.2, subject to the limits in Section 5.5, and shall have the right to buy, on each Purchase Date during such Offering Period (at the
applicable Purchase Price), such number of whole Shares as is determined by dividing (a) such Participant’s payroll deductions accumulated prior to such Purchase Date and retained in the Participant’s account as of the Purchase Date,
by (b) the applicable Purchase Price (rounded down to the nearest Share). The right shall expire on the earliest of: (x) the last Purchase Date of the Offering Period, (y) the last day of the Offering Period, and (z) the date on
which the Participant withdraws in accordance with Section 7.1 or Section 7.3. 
 6.2 Exercise of Rights. On
each Purchase Date, each Participant’s accumulated payroll deductions and any other additional payments specifically provided for in the applicable Offering Document will be applied to the purchase of whole Shares, up to the maximum number of
Shares permitted pursuant to the terms of the Plan and the applicable Offering Document, at the Purchase Price. No fractional Shares shall be issued upon the exercise of rights granted under the Plan, unless the Offering Document specifically
provides otherwise. Any cash in lieu of fractional Shares remaining after the purchase of whole Shares upon exercise of a purchase right will be credited to a Participant’s account and carried forward and applied toward the purchase of whole
Shares for the next following Offering Period, unless the Administrator provides that such amounts should be returned to the Participant in one lump sum payment in a subsequent payroll check. Shares issued pursuant to the Plan may be evidenced in
such manner as the Administrator may determine and may be issued in certificated form or issued pursuant to book-entry procedures. 

  
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 6.3 Pro Rata Allocation of Shares. If the Administrator determines
that, on a given Purchase Date, the number of Shares with respect to which rights are to be exercised may exceed (a) the number of Shares that were available for issuance under the Plan on the Enrollment Date of the applicable Offering Period,
or (b) the number of Shares available for issuance under the Plan on such Purchase Date, the Administrator may in its sole discretion provide that the Company shall make a pro rata allocation of the Shares available for purchase on such
Enrollment Date or Purchase Date, as applicable, in as uniform a manner as shall be practicable and as it shall determine in its sole discretion to be equitable among all Participants for whom rights to purchase Shares are to be exercised pursuant
to this Article VI on such Purchase Date, and shall either (i) continue all Offering Periods then in effect, or (ii) terminate any or all Offering Periods then in effect pursuant to Article IX. The Company may make pro rata
allocation of the Shares available on the Enrollment Date of any applicable Offering Period pursuant to the preceding sentence, notwithstanding any authorization of additional Shares for issuance under the Plan by the Company’s stockholders
subsequent to such Enrollment Date. The balance of the amount credited to the account of each Participant that has not been applied to the purchase of Shares shall be paid to such Participant in one lump sum in cash as soon as reasonably practicable
after the Purchase Date or such earlier date as determined by the Administrator. 
 6.4 Withholding. At the time a
Participant’s rights under the Plan are exercised, in whole or in part, or at the time some or all of the Shares issued under the Plan is disposed of, the Participant must make adequate provision for the Company’s federal, state, or other
tax withholding obligations, if any, that arise upon the exercise of the right or the disposition of the Shares. At any time, the Company may, but shall not be obligated to, withhold from the Participant’s compensation or Shares received
pursuant to the Plan the amount necessary for the Company to meet applicable withholding obligations, including any withholding required to make available to the Company any tax deductions or benefits attributable to sale or early disposition of
Shares by the Participant.  
 6.5 Conditions to Issuance of 6.6 Shares. The Company shall not be
required to issue or deliver any certificate or certificates for, or make any book entries evidencing, Shares purchased upon the exercise of rights under the Plan prior to fulfillment of all of the following conditions: (a) the admission of
such Shares to listing on all stock exchanges, if any, on which the Shares are then listed; (b) the completion of any registration or other qualification of such Shares under any state or federal law or under the rulings or regulations of the
Securities and Exchange Commission or any other governmental regulatory body, that the Administrator shall, in its absolute discretion, deem necessary or advisable; (c) the obtaining of any approval or other clearance from any state or federal
governmental agency that the Administrator shall, in its absolute discretion, determine to be necessary or advisable; (d) the payment to the Company of all amounts that it is required to withhold under federal, state or local law upon exercise
of the rights, if any; and (e) the lapse of such reasonable period of time following the exercise of the rights as the Administrator may from time to time establish for reasons of administrative convenience. 

ARTICLE VII. 

WITHDRAWAL; CESSATION OF ELIGIBILITY 

7.1 Withdrawal. A Participant may withdraw all but not less than all of the payroll deductions credited to his or her
account and not yet used to exercise his or her rights under the Plan at any time by giving written notice to the Company in a form acceptable to the Company no later than one (1) week prior to the end of the Offering Period (or such shorter or
longer period as may be specified by the Administrator in the applicable Offering Document). All of the Participant’s payroll deductions credited to his or her account during an Offering Period shall be paid to such Participant as soon as
reasonably practicable after receipt of notice of withdrawal and such Participant’s rights for the Offering Period shall be automatically terminated, and no further payroll deductions for the purchase of Shares shall be made for such Offering
Period. If a Participant withdraws from an Offering Period, payroll deductions shall not resume at the beginning of the next Offering Period unless the Participant timely delivers to the Company a new subscription agreement. 

  
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 7.2 Future Participation. A Participant’s withdrawal from an
Offering Period shall not have any effect upon his or her eligibility to participate in any similar plan that may hereafter be adopted by the Company or a Designated Subsidiary or in subsequent Offering Periods that commence after the termination of
the Offering Period from which the Participant withdraws. 
 7.3 Cessation of Eligibility. Upon a Participant’s
ceasing to be an Eligible Employee for any reason, he or she shall be deemed to have elected to withdraw from the Plan pursuant to this Article VII and the payroll deductions credited to such Participant’s account during the Offering
Period shall be paid to such Participant or, in the case of his or her death, to the person or persons entitled thereto under Section 12.4, as soon as reasonably practicable, and such Participant’s rights for the Offering Period shall be
automatically terminated. If a Participant transfers employment from the Company or any Designated Subsidiary participating in the Section 423 Component to any Designated Subsidiary participating in the
Non-Section 423 Component, such transfer shall not be treated as a termination of employment, but the Participant shall immediately cease to participate in the Section 423 Component; however, any
contributions made for the Offering Period in which such transfer occurs shall be transferred to the Non-Section 423 Component, and such Participant shall immediately join the then-current Offering under the Non-Section 423 Component upon the same terms and conditions in effect for the Participant’s participation in the Section 423 Component, except for such modifications otherwise applicable for Participants
in such Offering. A Participant who transfers employment from any Designated Subsidiary participating in the Non-Section 423 Component to the Company or any Designated Subsidiary participating in the
Section 423 Component shall not be treated as terminating the Participant’s employment and shall remain a Participant in the Non-Section 423 Component until the earlier of (i) the end of the
current Offering Period under the Non-Section 423 Component or (ii) the Enrollment Date of the first Offering Period in which the Participant is eligible to participate following such transfer.
Notwithstanding the foregoing, the Administrator may establish different rules to govern transfers of employment between entities participating in the Section 423 Component and the Non-Section 423
Component, consistent with the applicable requirements of Section 423 of the Code. 
 ARTICLE VIII. 

ADJUSTMENTS UPON CHANGES IN SHARES 

8.1 Changes in Capitalization. Subject to Section 8.3, in the event that the Administrator determines that any
dividend or other distribution (whether in the form of cash, Shares, other securities, or other property), change in control, reorganization, merger, amalgamation, consolidation, combination, repurchase, redemption, recapitalization, liquidation,
dissolution, or sale, transfer, exchange or other disposition of all or substantially all of the assets of the Company, or sale or exchange of Shares or other securities of the Company, issuance of warrants or other rights to purchase Shares or
other securities of the Company, or other similar corporate transaction or event, as determined by the Administrator, affects the Shares such that an adjustment is determined by the Administrator to be appropriate in order to prevent dilution or
enlargement of the benefits or potential benefits intended by the Company to be made available under the Plan or with respect to any outstanding purchase rights under the Plan, the Administrator shall make equitable adjustments, if any, to reflect
such change with respect to (a) the aggregate number and type of Shares (or other securities or property) that may be issued under the Plan (including, but not limited to, adjustments of the limitations in Section 3.1 and the limitations
established in each Offering Document pursuant to Section 4.2 on the maximum number of Shares that may be purchased); (b) the class(es) and number of Shares and price per Share subject to outstanding rights; and (c) the Purchase Price with
respect to any outstanding rights. 

  
 10 

 8.2 Other Adjustments. Subject to Section 8.3, in the event of
any transaction or event described in Section 8.1 or any unusual or nonrecurring transactions or events affecting the Company, any affiliate of the Company, or the financial statements of the Company or any affiliate, or of changes in
Applicable Law or accounting principles, the Administrator, in its discretion, and on such terms and conditions as it deems appropriate, is hereby authorized to take any one or more of the following actions whenever the Administrator determines that
such action is appropriate in order to prevent the dilution or enlargement of the benefits or potential benefits intended to be made available under the Plan or with respect to any right under the Plan, to facilitate such transactions or events or
to give effect to such changes in laws, regulations or principles: 
 (a) To provide for either (i) termination of any
outstanding right in exchange for an amount of cash, if any, equal to the amount that would have been obtained upon the exercise of such right had such right been currently exercisable or (ii) the replacement of such outstanding right with
other rights or property selected by the Administrator in its sole discretion; 
 (b) To provide that the outstanding rights
under the Plan shall be assumed by the successor or survivor corporation, or a parent or subsidiary thereof, or shall be substituted for by similar rights covering the stock of the successor or survivor corporation, or a parent or subsidiary
thereof, with appropriate adjustments as to the number and kind of shares and prices; 
 (c) To make adjustments in the
number and type of Shares (or other securities or property) subject to outstanding rights under the Plan and/or in the terms and conditions of outstanding rights and rights that may be granted in the future; 

(d) To provide that Participants’ accumulated payroll deductions may be used to purchase Shares prior to the next
occurring Purchase Date on such date as the Administrator determines in its sole discretion and the Participants’ rights under the ongoing Offering Period(s) shall be terminated; and 

(e) To provide that all outstanding rights shall terminate without being exercised. 

8.3 No Adjustment Under Certain Circumstances. Unless determined otherwise by the Administrator, no adjustment or action
described in this Article VIII or in any other provision of the Plan shall be authorized to the extent that such adjustment or action would cause the Section 423 Component of the Plan to fail to satisfy the requirements of Section 423
of the Code. 
 8.4 No Other Rights. Except as expressly provided in the Plan, no Participant shall have any rights by
reason of any subdivision or consolidation of shares of stock of any class, the payment of any dividend, any increase or decrease in the number of shares of stock of any class or any dissolution, liquidation, merger, or consolidation of the Company
or any other corporation. Except as expressly provided in the Plan or pursuant to action of the Administrator under the Plan, no issuance by the Company of shares of stock of any class, or securities convertible into shares of stock of any class,
shall affect, and no adjustment by reason thereof shall be made with respect to, the number of Shares subject to outstanding rights under the Plan or the Purchase Price with respect to any outstanding rights. 

ARTICLE IX. 
 AMENDMENT,
MODIFICATION AND TERMINATION 
 9.1 Amendment, Modification and Termination. The Administrator may amend, suspend
or terminate the Plan at any time and from time to time; provided, however, that approval of the Company’s stockholders shall be required to amend the Plan to: (a) increase the aggregate number, or change the type, of
shares that may be sold pursuant to rights under the Plan under Section 3.1 (other than an adjustment as provided by Article VIII) or (b) change the corporations or classes of corporations whose employees may be granted rights under
the Plan. 

  
 11 

 9.2 Certain Changes to Plan. Without stockholder consent and without
regard to whether any Participant rights may be considered to have been adversely affected (and, with respect to the Section 423 Component of the Plan, after taking into account Section 423 of the Code), the Administrator shall be entitled
to change or terminate the Offering Periods, limit the frequency and/or number of changes in the amount withheld from Compensation during an Offering Period, establish the exchange ratio applicable to amounts withheld in a currency other than U.S.
dollars, permit payroll withholding in excess of the amount designated by a Participant in order to adjust for delays or mistakes in the Company’s processing of payroll withholding elections, establish reasonable waiting and adjustment periods
and/or accounting and crediting procedures to ensure that amounts applied toward the purchase of Shares for each Participant properly correspond with amounts withheld from the Participant’s Compensation, and establish such other limitations or
procedures as the Administrator determines in its sole discretion to be advisable that are consistent with the Plan. 
 9.3
Actions In the Event of Unfavorable Financial Accounting Consequences. In the event the Administrator determines that the ongoing operation of the Plan may result in unfavorable financial accounting consequences, the Administrator may, in its
discretion and, to the extent necessary or desirable, modify or amend the Plan to reduce or eliminate such accounting consequence including, but not limited to: 

(a) altering the Purchase Price for any Offering Period including an Offering Period underway at the time of the change in
Purchase Price; 
 (b) shortening any Offering Period so that the Offering Period ends on a new Purchase Date, including an
Offering Period underway at the time of the Administrator action; and 
 (c) allocating Shares. 

Such modifications or amendments shall not require stockholder approval or the consent of any Participant. 

9.4 Payments Upon Termination of Plan. Upon termination of the Plan, the balance in each Participant’s Plan account
shall be refunded as soon as practicable after such termination, without any interest thereon, or the Offering Period may be shortened so that the purchase of Shares occurs prior to the termination of the Plan. 

ARTICLE X. 
 TERM OF PLAN

 The Plan shall become effective on the Effective Date. The effectiveness of the Section 423 Component of the
Plan shall be subject to approval of the Plan by the Company’s stockholders within twelve (12) months following the date the Plan is first approved by the Board. No right may be granted under the Section 423 Component of the Plan
prior to such stockholder approval. The Plan shall remain in effect until terminated under Section 9.1. No rights may be granted under the Plan during any period of suspension of the Plan or after termination of the Plan. 

ARTICLE XI. 

ADMINISTRATION 

11.1 Administrator. Unless otherwise determined by the Board, the Administrator of the Plan shall be the Compensation
Committee of the Board (or another committee or a subcommittee of the Board to which the Board delegates administration of the Plan). The Board may at any time vest in the Board any authority or duties for administration of the Plan. The
Administrator may delegate administrative tasks under the Plan to the services of an Agent or Employees to assist in the administration of the Plan, including establishing and maintaining an individual securities account under the Plan for each
Participant. 

  
 12 

 11.2 Authority of Administrator. The Administrator shall have the
power, subject to, and within the limitations of, the express provisions of the Plan: 
 (a) To determine when and how rights
to purchase Shares shall be granted and the provisions of each offering of such rights (which need not be identical). 
 (b)
To designate from time to time which Subsidiaries of the Company shall be Designated Subsidiaries, which designation may be made without the approval of the stockholders of the Company. 

(c) To impose a mandatory holding period pursuant to which Employees may not dispose of or transfer Shares purchased under the
Plan for a period of time determined by the Administrator in its discretion. 
 (d) To construe and interpret the Plan and
rights granted under it, and to establish, amend and revoke rules and regulations for its administration. The Administrator, in the exercise of this power, may correct any defect, omission or inconsistency in the Plan, in a manner and to the extent
it shall deem necessary or expedient to make the Plan fully effective. 
 (e) To amend, suspend or terminate the Plan as
provided in Article IX. 
 (f) Generally, to exercise such powers and to perform such acts as the Administrator deems
necessary or expedient to promote the best interests of the Company and its Subsidiaries and to carry out the intent that the Plan be treated as an “employee stock purchase plan” within the meaning of Section 423 of the Code for the
Section 423 Component. 
 (g) The Administrator may adopt sub-plans applicable
to particular Designated Subsidiaries or locations, which sub-plans may be designed to be outside the scope of Section 423 of the Code. The rules of such sub-plans
may take precedence over other provisions of this Plan, with the exception of Section 3.1 hereof, but unless otherwise superseded by the terms of such sub-plan, the provisions of this Plan shall govern the operation of such sub-plan. 

11.3 Decisions Binding. The Administrator’s interpretation of the Plan, any rights granted pursuant to the Plan,
any subscription agreement and all decisions and determinations by the Administrator with respect to the Plan are final, binding, and conclusive on all parties. 

ARTICLE XII. 

MISCELLANEOUS 

12.1 Restriction upon Assignment. A right granted under the Plan shall not be transferable other than by will or
the applicable laws of descent and distribution, and is exercisable during the Participant’s lifetime only by the Participant. Except as provided in Section 12.4 hereof, a right under the Plan may not be exercised to any extent except by
the Participant. The Company shall not recognize and shall be under no duty to recognize any assignment or alienation of the Participant’s interest in the Plan, the Participant’s rights under the Plan or any rights thereunder. 

  
 13 

 12.2 Rights as a Stockholder. With respect to Shares subject to a
right granted under the Plan, a Participant shall not be deemed to be a stockholder of the Company, and the Participant shall not have any of the rights or privileges of a stockholder, until such Shares have been issued to the Participant or his or
her nominee following exercise of the Participant’s rights under the Plan. No adjustments shall be made for dividends (ordinary or extraordinary, whether in cash securities, or other property) or distribution or other rights for which the
record date occurs prior to the date of such issuance, except as otherwise expressly provided herein or as determined by the Administrator. 

12.3 Interest. No interest shall accrue on the payroll deductions or contributions of a Participant under the Plan. 

12.4 Designation of Beneficiary. 

(a) A Participant may, in the manner determined by the Administrator, file a written designation of a beneficiary who is to
receive any Shares and/or cash, if any, from the Participant’s account under the Plan in the event of such Participant’s death subsequent to a Purchase Date on which the Participant’s rights are exercised but prior to delivery to such
Participant of such Shares and cash. In addition, a Participant may file a written designation of a beneficiary who is to receive any cash from the Participant’s account under the Plan in the event of such Participant’s death prior to
exercise of the Participant’s rights under the Plan. If the Participant is married and resides in a community property state, a designation of a person other than the Participant’s spouse as his or her beneficiary shall not be effective
without the prior written consent of the Participant’s spouse. 
 (b) Such designation of beneficiary may be changed by
the Participant at any time by written notice to the Company. In the event of the death of a Participant and in the absence of a beneficiary validly designated under the Plan who is living at the time of such Participant’s death, the Company
shall deliver such Shares and/or cash to the executor or administrator of the estate of the Participant, or if no such executor or administrator has been appointed (to the knowledge of the Company), the Company, in its discretion, may deliver such
Shares and/or cash to the spouse or to any one or more dependents or relatives of the Participant, or if no spouse, dependent or relative is known to the Company, then to such other person as the Company may designate. 

12.5 Notices. All notices or other communications by a Participant to the Company under or in connection with the Plan
shall be deemed to have been duly given when received in the form specified by the Company at the location, or by the person, designated by the Company for the receipt thereof. 

12.6 Equal Rights and Privileges. Subject to Section 5.7, all Eligible Employees will have equal rights and
privileges under the Section 423 Component so that the Section 423 Component of this Plan qualifies as an “employee stock purchase plan” within the meaning of Section 423 of the Code. Subject to Section 5.7, any
provision of the Section 423 Component that is inconsistent with Section 423 of the Code will, without further act or amendment by the Company, the Board or the Administrator, be reformed to comply with the equal rights and privileges
requirement of Section 423 of the Code. Eligible Employees participating in the Non-Section 423 Component need not have the same rights and privileges as other Eligible Employees participating in the Non-Section 423 Component or as Eligible Employees participating in the Section 423 Component. 

12.7 Use of Funds. All payroll deductions received or held by the Company under the Plan may be used by the Company for
any corporate purpose, and the Company shall not be obligated to segregate such payroll deductions. 

  
 14 

 12.8 Reports. Statements of account shall be given to Participants at
least annually, which statements shall set forth the amounts of payroll deductions, the Purchase Price, the number of Shares purchased and the remaining cash balance, if any. 

12.9 No Employment Rights. Nothing in the Plan shall be construed to give any person (including any Eligible Employee or
Participant) the right to remain in the employ of the Company or any Parent or Subsidiary or affect the right of the Company or any Parent or Subsidiary to terminate the employment of any person (including any Eligible Employee or Participant) at
any time, with or without cause. 
 12.10 Notice of Disposition of Shares. Each Participant shall give prompt notice
to the Company of any disposition or other transfer of any Shares purchased upon exercise of a right under the Section 423 Component of the Plan if such disposition or transfer is made: (a) within two (2) years from the Enrollment
Date of the Offering Period in which the Shares were purchased or (b) within one (1) year after the Purchase Date on which such Shares were purchased. Such notice shall specify the date of such disposition or other transfer and the amount
realized, in cash, other property, assumption of indebtedness or other consideration, by the Participant in such disposition or other transfer. 

12.11 Governing Law. The Plan and any agreements hereunder shall be administered, interpreted and enforced in accordance
with the laws of the State of Delaware, disregarding any state’s choice of law principles requiring the application of a jurisdiction’s laws other than the State of Delaware. 

12.12 Electronic Forms. To the extent permitted by Applicable Law and in the discretion of the Administrator, an
Eligible Employee may submit any form or notice as set forth herein by means of an electronic form approved by the Administrator. Before the commencement of an Offering Period, the Administrator shall prescribe the time limits within which any such
electronic form shall be submitted to the Administrator with respect to such Offering Period in order to be a valid election. 
 * * * * *

  
 15 

 HILLEVAX, INC. 

2022 EMPLOYEE STOCK PURCHASE PLAN 

SUB-PLAN FOR 

INTERNATIONAL PARTICIPANTS 

1. APPLICATION 

This Sub-Plan for Participants in non-U.S.
jurisdictions in the HilleVax, Inc. Employee Stock Purchase Plan (this “Sub-Plan”) sets forth additional terms and conditions applicable to the rights granted to, and the shares of
Common Stock purchased by, Eligible Employees in the countries set forth below. 
 The Plan and this Sub-Plan are complimentary to each other and shall be deemed as one. In any case of contradiction between the provisions of this Sub-Plan and the Plan, the provisions set out
in the Sub-Plan shall prevail. Any capitalized terms used in this Sub-Plan but not defined shall have the meaning given to those terms in the Plan. 

2. GLOBAL PROVISIONS 

(a) Data Protection. It shall be a term and condition for participation in the Plan that a Participant explicitly and
unambiguously consent to the collection, use and transfer, in electronic or other form, of a Participant’s personal “Data” (as defined below) by and among, as applicable, the Company, any Parent or Subsidiary and a Participant’s
employing entity (the “Employer”), if different, and their affiliates (collectively, the “Company Group”) for the exclusive purpose of implementing, administering and managing the Participant’s
participation in the Plan. The Company Group holds certain personal information about the Participant, including, but not limited to, the Participant’s name, home address and telephone number, e-mail
address, date of birth, employee identification number, NRIC or passport number or equivalent, salary, nationality, job title, any shares of stock or directorships held in the Company, details of all options or any other entitlement to shares of
stock awarded, canceled, exercised, vested, unvested or outstanding in the Participant’s favor, for the purpose of implementing, administering and managing the Plan (“Data”). Data will be transferred to such stock plan
service providers, as may be prudently selected by the Company, which are assisting the Company with the implementation, administration and management of the Plan. The recipients of the Data may be located in the United States of America or
elsewhere (and, if the Participant is a resident of a member state of the European Union, may be outside the European Economic Area) and that the recipient’s country (e.g., the United States of America) may have different data privacy laws and
protections than the Participant’s country. The Participant may request a list with the names and addresses of all recipients of the Data by contacting his or her local human resources representative. Each Participant hereby authorizes the
Company Group and any other possible recipients which may assist the Company (presently or in the future) with implementing, administering and managing the Plan to receive, possess, use, retain and transfer the Data, in electronic or other form, for
the purposes of implementing, administering and managing the Participant’s participation in the Plan. Data will be held only as long as is necessary to implement, administer and manage the Participant’s participation in the Plan. The
Company will also make the Data available to public authorities where required under locally applicable law. A Participant may, at any time, view Data, request additional information about the storage and processing of Data, require any necessary
amendments to Data or refuse or withdraw the consents herein, in any case, without cost, by contacting in writing the Participant’s local human resources representative. A Participant’s refusal to provide consent or withdrawal of consent
may affect the Participant’s ability to participate in the Plan. This section applies to information held, used or disclosed in any medium. 

  
 16 

 If Participant resides in the UK or the European Union, the Company Group will hold,
collect and otherwise process certain Data as set out in the applicable Company’s GDPR-compliant data privacy notice, which will be or has been provided to the Participant separately. All personal data will be treated in accordance with
applicable data protection laws and regulations. 
 (b) Acknowledgment of Nature of Plan and Rights. In
participating in the Plan, each Participant acknowledges that: 
 (i) for employment and labor law purposes, the rights
granted and the shares of Common Stock purchased under the Plan are an extraordinary item that do not constitute wages of any kind for services of any kind rendered to the Company, any Parent or Subsidiary or the Employer, and the award of rights is
outside the scope of Participant’s service contract, if any; 
 (ii) for employment and labor law purposes, the rights
granted and the Common Stock purchased under the Plan are not part of normal or expected wages or salary for any purposes, 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 benefits or similar payments and in no event should be considered as compensation for, or relating in any way to, past services for the Company, the Employer, its Parent or
any Subsidiary of the Company; 
 (iii) the rights and the shares of Common Stock purchased under the Plan are not intended
to be an integral component of compensation or to replace any pension rights or compensation; 
 (iv) neither the rights nor
any provision of Plan or the policies adopted pursuant to the Plan confer upon any Participant any right with respect to service or continuation of current service and shall not be interpreted to form a service contract or relationship with the
Company or any Subsidiary; 
 (v) the future value of the underlying shares of Common Stock is unknown and cannot be
predicted with certainty; 
 (vi) if the underlying shares of Common Stock do not increase in value, the right may have no
value; and 
 (vii) if a Participant acquires shares of Common Stock, the value of the shares of Common Stock acquired upon
purchase may increase or decrease in value, even below the original price paid. 

  
 17 

 HILLEVAX, INC. 

2022 EMPLOYEE STOCK PURCHASE PLAN 

SUB-PLAN FOR 

INTERNATIONAL PARTICIPANTS 

SWITZERLAND 
 1.
APPLICATION 
 This section sets forth additional terms and conditions applicable to the rights granted to, and the
Shares purchased by, Eligible Employees who are (or are deemed to be) resident in Switzerland for the purpose of payment of taxes or who exercise all of their employment duties in Switzerland and forms an integral part of the Plan and Sub-Plan. 
 2. SECURITIES LAW INFORMATION 

The option granted under the Plan is not intended to be publicly offered in or from Switzerland. Neither the Plan (including
the Sub-Plan) nor any other materials relating to the right granted under the Plan to purchase Shares constitutes a prospectus as such term is understood pursuant to article 652a of the Swiss Code of
Obligations and neither this document nor any other materials relating to the right granted under the Plan to purchase Shares may be publicly distributed nor otherwise made publicly available in Switzerland. Neither the Plan (including the Sub-Plan) nor any other offering or marketing material relating to the right granted under the Plan to purchase Shares has been or will be filed with, approved, or supervised by any Swiss regulatory authority (in
particular, the Swiss Financial Market Supervisory Authority (FINMA)). 

  
 18EX-10.4

 Exhibit 10.4 

HILLEVAX, INC. 

NON-EMPLOYEE DIRECTOR COMPENSATION
PROGRAM 
 Non-employee members of the board of directors (the
“Board”) of HilleVax, Inc. (the “Company”) shall receive cash and equity compensation as set forth in this Non-Employee Director Compensation Program (this
“Program”). The cash and equity compensation described in this Program shall be paid or be made, as applicable, automatically and without further action of the Board, to each member of the Board who is not an employee of the
Company or any parent or subsidiary of the Company (each, a “Non-Employee Director”) who is entitled to receive such cash or equity compensation, unless such Non-Employee Director declines the receipt of such cash or equity compensation by written notice to the Company and subject to any limits on non-employee director compensation
set forth in the Equity Plan (as defined below). This Program shall remain in effect until it is revised or rescinded by further action of the Board. This Program may be amended, modified or terminated by the Board at any time in its sole
discretion. The terms and conditions of this Program shall supersede any prior cash and/or equity compensation arrangements for service as a member of the Board between the Company and any of its Non-Employee
Directors, except for equity compensation previously granted to a Non-Employee Director. This Program shall become effective on the date of the effectiveness of the Company’s Registration Statement on
Form S-1 relating to the initial public offering of the Company’s common stock (the “Effective Date”). 

CASH COMPENSATION 

The schedule of annual retainers (the “Annual Retainers”) for the Non-Employee
Directors is as follows: 
  

					
	 Position
	  	 Amount
	 
	 Base Board Retainer
	  	$	40,000	 
	 Chair of the Board or Lead Independent Director
	  	$	20,000	 
	 Chair of Audit Committee
	  	$	20,000	 
	 Chair of Compensation Committee
	  	$	12,000	 
	 Chair of Nominating and Corporate Governance Committee
	  	$	8,000	 
	 Member of Audit Committee (non-Chair)
	  	$	10,000	 
	 Member of Compensation Committee (non-Chair)
	  	$	6,000	 
	 Member of Nominating and Corporate Governance Committee
(non-Chair)
	  	$	4,000	 

  
 1 

 For the avoidance of doubt, the Annual Retainers in the table above are additive and a Non-Employee Director shall be eligible to earn an Annual Retainer for each position in which he or she serves. Subject to the occurrence of the Effective Date, the Annual Retainers shall be effective as of
January 1, 2022 and shall be earned on a quarterly basis based on a calendar quarter and shall be paid in cash by the Company in arrears not later than the fifteenth day following the end of each calendar quarter (with the payment for any
portion of calendar year 2022 that is payable for any period prior to the Effective Date to be paid with the next occurring quarterly payment). In the event a Non-Employee Director does not serve as a Non-Employee Director, or in the applicable position, for an entire calendar quarter, the Annual Retainer paid to such Non-Employee Director shall be prorated for the portion
of such calendar quarter actually served as a Non-Employee Director, or in such position, as applicable. The Board may adopt a program that allows Non-Employee Directors
to defer Annual Retainers. 
 EQUITY COMPENSATION 

Each Non-Employee Director shall be granted the equity awards described below, which equity awards
shall be granted under and subject to the terms and provisions of the Company’s 2022 Incentive Award Plan or any other applicable Company equity incentive plan then-maintained by the Company (the “Equity Plan”), and
shall be subject to an equity award agreement in substantially the form previously approved by the Board for use under the Equity Plan. All applicable terms of the Equity Plan apply to this Program as if fully set forth herein, and all grants of
equity awards hereby are subject in all respects to the terms of the Equity Plan and the applicable equity award agreement. 

A. Initial Awards. Each Non-Employee Director who is initially elected or
appointed to the Board following the Effective Date shall be automatically granted stock options to purchase 34,000 shares of the Company’s common stock under the Equity Plan on the date of such initial election or appointment. The awards
described in this Section shall be referred to as “Initial Awards.” 
 B. Annual Awards. A Non-Employee Director who (i) is serving on the Board as of the date of any annual meeting of the Company’s stockholders following the Effective Date, and (ii) will continue to serve as a Non-Employee Director immediately following such meeting, shall be automatically granted stock options to purchase 17,000 shares of the Company’s common stock under the Equity Plan on the date of such annual
meeting. The awards described in this Section shall be referred to as “Annual Awards.” For the avoidance of doubt, a Non-Employee Director elected for the first time to the Board at an
annual meeting of the Company’s stockholders shall only receive an Initial Award in connection with such election, and shall not receive any Annual Award on the date of such meeting as well. In addition, in the event of an adjournment or
postponement of any annual meeting following the time such meeting commences, the date of the annual meeting for purposes of this clause (B) shall be the date on which the business to be conducted at the annual meeting is concluded. 

Notwithstanding the foregoing, a Non-Employee Director shall have served as a Non-Employee Director for at least (6) months as of the date of any annual meeting to receive an Annual Award, unless otherwise determined by the Board; in which case, the Board may determine to grant such Non-Employee Director an Annual Award or a Prorated Annual Award (as defined below). “Prorated Annual Award” means the product determined by multiplying (i) the Annual Award, by
(ii) a fraction, the numerator of which is equal to (x) 365 minus (y) the number of days that elapsed from the date of the annual meeting of the Company’s stockholders preceding the Non-Employee
Director’s date of initial election or appointment to the date of such initial election or appointment, and the denominator of which is 365.  

  
 2 

 C. Terms of Awards Granted to
Non-Employee Directors. 
 1. Vesting. Each Initial Award shall vest and
become exercisable in substantially equal monthly installments over the three (3) years beginning on the date of the Non-Employee Director’s election or appointment to the Board, subject to the Non-Employee Director continuing in service on the Board through each such vesting date. Each Annual Award shall vest and/or become exercisable on the first to occur of (A) the first anniversary of the date of
grant or (B) the next occurring annual meeting of the Company’s stockholders, subject to the Non-Employee Director continuing in service on the Board through such vesting date. 

2. Forfeiture. Unless the Board otherwise determines or as otherwise provided in this Clause (2), any portion of an
Initial Award or Annual Award which is unvested at the time of a Non-Employee Director’s termination of service on the Board as a Non-Employee Director shall be
immediately forfeited upon such termination of service and shall not thereafter become vested. All of a Non-Employee Director’s Initial Awards and Annual Awards shall vest in full upon a Non-Employee Director’s Termination of Service by reason of death or Disability and immediately prior to the occurrence of a Change in Control (as defined in the Equity Plan), to the extent outstanding at such
time. 
 3. Reimbursements. The Company shall reimburse each Non-Employee
Director for all reasonable, documented, out-of-pocket travel and other business expenses incurred by such Non-Employee Director
in the performance of his or her duties to the Company in accordance with the Company’s applicable expense reimbursement policies and procedures as in effect from time to time.  

* * * * * 

  
 3

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