Document:

EX-4.3

 Exhibit 4.3 

HILLEVAX, INC. 
 NOTE
PURCHASE AGREEMENT 
 August 31, 2021 
  

 TABLE OF CONTENTS 

 

									
	 	 	 	  	 	  	Page	 
	 1.
	 	 Definitions
	  	 	1	 
			
	 2.
	 	 Terms of the Convertible Notes
	  	 	7	 
				
	 	 	2.1	  	Issuance of Convertible Notes	  	7	 
	 	 	2.2	  	Right to Convert Notes	  	7	 
			
	 3.
	 	 Closing Mechanics
	  	 	9	 
				
	 	 	3.1	  	Closing	  	9	 
	 	 	3.2	  	Conditions of Lenders’ Obligations at Closing	  	10	 
	 	 	3.3	  	Conditions of the Company’s Obligations at Closing	  	10	 
			
	 4.
	 	 Representations and Warranties of the Company
	  	 	11	 
				
	 	 	4.1	  	Organization, Good Standing and Qualification	  	11	 
	 	 	4.2	  	Capitalization	  	11	 
	 	 	4.3	  	Subsidiaries	  	12	 
	 	 	4.4	  	Authorization	  	12	 
	 	 	4.5	  	Compliance with Other Instruments	  	12	 
	 	 	4.6	  	Governmental Consents and Filings	  	12	 
	 	 	4.7	  	Litigation	  	13	 
	 	 	4.8	  	Intellectual Property	  	13	 
	 	 	4.9	  	Property	  	14	 
	 	 	4.10	  	Absence of Undisclosed Liabilities	  	14	 
	 	 	4.11	  	Valid Issuance of Conversion Shares	  	14	 
	 	 	4.12	  	Committee on Foreign Investment	  	15	 
	 	 	4.13	  	Disclosure	  	15	 
			
	 5.
	 	 Representations, Warranties and Additional Agreements of the Lenders
	  	 	16	 
				
	 	 	5.1	  	Representations and Warranties of the Lenders	  	16	 
	 	 	5.2	  	Further Limitations on Disposition	  	17	 
	 	 	5.3	  	Legends	  	17	 
	 	 	5.4	  	Bad Actor Representations and Covenants	  	18	 
	 	 	5.5	  	Exculpation Among Lenders	  	18	 
			
	 6.
	 	 Defaults and Remedies
	  	 	18	 
				
	 	 	6.1	  	Events of Default	  	18	 
	 	 	6.2	  	Remedies	  	19	 
			
	 7.
	 	 Covenants of the Company; Rights of the Holders of the Notes
	  	 	19	 
				
	 	 	7.1	  	Delivery of Financial Statements; Inspection Rights	  	19	 
	 	 	7.2	  	Right of First Offer	  	21	 
	 	 	7.3	  	Rights of Refusal	  	23	 
	 	 	7.4	  	Drag Along Right	  	26	 
	 	 	7.5	  	Registration Rights	  	29	 
	 	 	7.6	  	Voting Provisions Regarding the Board Provisions	  	39	 

  
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	 	 	7.7	  	Protective Provisions	  	43	 
	 	 	7.8	  	Directors’ and Officers’ Insurance	  	43	 
	 	 	7.9	  	Observer Rights	  	43	 
	 	 	7.10	  	Confidentiality	  	44	 
			
	 8.
	 	 Miscellaneous
	  	 	45	 
				
	 	 	8.1	  	Successors and Assigns	  	45	 
	 	 	8.2	  	Governing Law	  	45	 
	 	 	8.3	  	Counterparts; Delivery	  	45	 
	 	 	8.4	  	Titles and Subtitles	  	46	 
	 	 	8.5	  	Notices	  	46	 
	 	 	8.6	  	Finder’s Fee	  	47	 
	 	 	8.7	  	Expenses	  	47	 
	 	 	8.8	  	Entire Agreement; Amendments and Waivers	  	47	 
	 	 	8.9	  	Effect of Amendment or Waiver	  	48	 
	 	 	8.10	  	Severability	  	48	 
	 	 	8.11	  	“Market Stand-Off” Agreement	  	48	 
	 	 	8.12	  	Financing Documents	  	49	 
	 	 	8.13	  	MFN Right	  	49	 
	 	 	8.14	  	Exculpation Among Lenders	  	49	 
	 	 	8.15	  	Acknowledgement	  	50	 
	 	 	8.16	  	Indemnity; Costs, Expenses and Attorneys’ Fees	  	50	 
	 	 	8.17	  	Further Assurance	  	50	 
	 	 	8.18	  	Dispute Resolution	  	50	 
	 	 	8.19	  	Waiver of Jury Trial	  	50	 
	 	 	8.20	  	Survival	  	51	 
	 	 	8.21	  	Spousal Consent	  	51	 
	 	 	8.22	  	Limitation of Liability; Freedom to Operate Affiliates.	  	51	 

 Exhibits 
  

					
	 Exhibit A
	 	 –
	  	 Form of Note

	 Exhibit B
	 	 –
	  	 Rule 506(D) Bad Actor Representations

	 Exhibit C
	 	 –
	  	 List of Common Holders

	 Exhibit D
	 	 –
	  	 Form of Management Rights Letter

	 Exhibit E
	 	 –
	  	 Form of Indemnification Agreement

	 Exhibit F
	 	 –
	  	 Disclosure Schedule

	 Exhibit G
	 	 –
	  	 Form of Adoption Agreement

	 Exhibit H
	 	 –
	  	 Form of Spousal Consent

  
 ii 

 NOTE PURCHASE AGREEMENT 

THIS NOTE PURCHASE AGREEMENT (“Agreement”) is made as of August 31, 2021, by and among HilleVax, Inc., a Delaware
corporation (the “Company”), and the lenders (each, a “Lender” and collectively, the “Lenders”) named on the Schedule of Lenders attached hereto (the “Schedule of Lenders”), and the Common
Holders (as defined herein) (collectively, the “Parties”). Capitalized terms not otherwise defined in this Agreement shall have the meanings ascribed to them in Section 1 below. 

WHEREAS, each of the Lenders intends to provide certain Consideration to the Company as described for each Lender on the Schedule of
Lenders; 
 WHEREAS, the parties wish to provide for the sale and issuance of certain Notes in return for the provision by the
Lenders of the Consideration to the Company; and 
 WHEREAS, the parties intend for the Company to issue in return for the
Consideration one or more Notes that are convertible into shares of the Company’s Equity Securities. 
 NOW, THEREFORE, THE PARTIES
HEREBY AGREE AS FOLLOWS: 
 1.    Definitions. 

(a)    “Affiliate” means, with respect to any Person, any other Person who, directly or indirectly,
controls, is controlled by, or is under common control with such Person, including, without limitation, any general partner, managing member, officer or director of such Person or any venture capital fund or other investment fund now or hereafter
existing that is controlled by one or more general partners or managing members of, or shares the same management or advisory company with, such Person, and with respect to a Person that is an investment fund, its other equityholders, partners
(including partners and affiliated partnerships managed by the same management company or managing (general) partner or by any Person that is an Affiliate with such management company or managing (general) partner), members and a trust for the
benefit of such other equityholders of such Person. 
 (b)    “Board” means the Board of Directors of
the Company. 
 (c)    “Certificate of Incorporation” means the Certificate of Incorporation of the
Company, as amended. 
 (d)    “Common Holder” means a holder of Common Stock listed on Exhibit
C attached hereto (collectively, the “Common Holders”). 
 (e)    “Common Stock”
means shares of common stock, par value $0.0001, of the Company. 
 (f)    “Company Intellectual
Property” means all patents, patent applications, registered and unregistered trademarks, trademark applications, registered and unregistered service 

  
 1 

 
marks, service mark applications, tradenames, copyrights, trade secrets, domain names, mask works, information and proprietary rights and processes, similar or other intellectual property rights,
subject matter of any of the foregoing, tangible embodiments of any of the foregoing, licenses in, to and under any of the foregoing, and any and all such cases that are owned or used by or are necessary to the Company in the conduct of the
Company’s business as now conducted and as presently proposed to be conducted. 

(g)    “Consideration” means the amount of money paid by each Lender pursuant to this Agreement as shown
on the Schedule of Lenders in the form of a check, wire transfer, cancellation or exchange of indebtedness, or any combination thereof. 

(h)    “Conversion Cap Price Per Share” means the quotient obtained by dividing the following: 

(i)    the Valuation Cap less the aggregate principal amount and accrued interest under the Notes, by 

(ii)    the Pre-closing Capitalization. 

(i)    “Conversion Price” means: 

(i)    with respect to a conversion pursuant to Section 2.2(a) below, the lesser of (A) the Discounted
Conversion Price or (B) the Conversion Cap Price Per Share; 
 (ii)    with respect to a conversion pursuant to
Section 2.2(b) below, the Non-Qualified Discounted Conversion Price; 

(iii)    with respect to a conversion pursuant to Section 2.2(c) below, the Conversion Cap Price Per Share; 

(iv)    with respect to a conversion pursuant to Section 2.2(d) below, the lesser of (A) the Discounted
Conversion Price or (B) the Conversion Cap Price Per Share; 
 (v)    with respect to a conversion pursuant to
Section 2.2(e) below, the Conversion Cap Price Per Share; and 
 (vi)    with respect to a conversion pursuant to
Section 2.2(f) below, the lesser of (A) the Discounted SPAC Price or (B) the Conversion Cap Price Per Share. 

(j)    “Conversion Shares” shall, for purposes of determining the type of Equity Securities issuable
upon conversion of the Notes, mean: 
 (i)    if the Notes are converted to equity pursuant to Section 2.2(a)
below, the Equity Securities issued in the Next Equity Financing; 
 (ii)    if the Notes are converted to equity
pursuant to Section 2.2(b) below, the Equity Securities issued in the Non-Qualified Next Equity Financing; 

  
 2 

 (iii)    if the Notes are converted to equity pursuant to
Section 2.2(c) below, shares of Common Stock; 
 (iv)    if the Notes are converted to equity pursuant to
Section 2.2(d) below, shares of Common Stock; 
 (v)    if the Notes are converted to equity pursuant to
Section 2.2(e) below, shares of Common Stock; and 
 (vi)    if the Notes are converted to equity pursuant to
Section 2.2(f) below, shares of Common Stock. 
 (k)    “Corporate Transaction” means
(A) the closing of the sale, transfer or other disposition of all or substantially all of this Company’s assets, (B) the consummation of the merger or consolidation of this Company with or into another entity (except a merger or
consolidation in which the holders of capital stock of this Company immediately prior to such merger or consolidation continue to hold at least 50% of the voting power of the capital stock of this Company or the surviving or acquiring entity in
substantially identical proportions and with substantially identical rights, preferences, privileges and restrictions as existed immediately prior to such transaction), (C) the closing of the transfer (whether by merger, consolidation or
otherwise), in one transaction or a series of related transactions, to a person or group of affiliated persons (other than an underwriter of this corporation’s securities), of this Company’s securities if, after such closing, such person
or group of affiliated persons would hold 50% or more of the outstanding voting stock of this Company (or the surviving or acquiring entity) (a “Stock Sale”) or (D) a liquidation, dissolution or winding up of this Company;
provided, however, that a transaction shall not constitute a Corporate Transaction if its sole purpose is to change the state of this Company’s incorporation or to create a holding company that will be owned in substantially the
same proportions by the persons who held this Company’s securities immediately prior to such transaction. Notwithstanding the prior sentence, the sale of shares of Preferred Stock in a bona fide financing transaction for the purposes of raising
operating capital to bona fide institutional, venture capital, private equity and similar investors shall not be deemed a “Corporate Transaction.” 

(l)    “Discounted Conversion Price” shall equal 80% of the New Purchase Price. 

(m)    “Discounted SPAC Price” shall equal 80% of the price per share of Common Stock implied by the
nominal value of the Company in the SPAC transaction. For the avoidance of doubt, the nominal value of the Company shall not include any Earn-Out Consideration. For the avoidance of doubt, the nominal value
shall be calculated based upon the valuation of the Company implied in the business combination agreement at the signing, 

  
 3 

 and shall not take into account any changes in pricing based upon changes in the share price of the publicly
traded SPAC shares. 
 (n)    “Equity Securities” means the Company’s Common Stock or Preferred
Stock or any securities conferring the right to purchase the Company’s Common Stock or Preferred Stock or securities directly or indirectly convertible into, or exchangeable for (with or without additional consideration), the Company’s
Common Stock or Preferred Stock. 
 (o)    “Exchange Act” means the Securities Exchange Act of 1934,
as amended. 
 (p)    “Form S-3” means such
form under the Securities Act as in effect on the date hereof or any registration form under the Securities Act subsequently adopted by the SEC that permits inclusion or incorporation of substantial information by reference to other documents filed
by the Company with the SEC. 
 (q)    “Frazier” means Frazier Life Sciences X, L.P. 

(r)    “Free Writing Prospectus” means a free-writing prospectus, as defined in Rule 405. 

(s)    “Holder” means any Person owning or having the right to acquire Registrable Securities or any
assignee thereof in accordance with Section 7.5(j) of this Agreement. 
 (t)    “Initial Public
Offering” means the closing of the issuance and sale of shares of Equity Securities of the Company in the Company’s first firm-commitment underwritten public offering pursuant to an effective registration statement under the Securities
Act in which the gross cash proceeds to the Company (before underwriting discounts, commissions and fees) are at least $75,000,000 (excluding the aggregate amount of debt securities converted into Equity Securities upon conversion of convertible
indebtedness, including, without limitation, the Notes converted pursuant to Section 2.2 below) or such lesser amount as may be approved by the Requisite Noteholders. 

(u)    “Key Employee” means any executive-level employee (including division director and vice
president-level positions) as well as any employee or consultant who either alone or in concert with others develops, invents, programs or designs any Company Intellectual Property. 

(v)    “Material Adverse Effect” means a material adverse effect on the business, assets (including
intangible assets), liabilities, financial condition, property, prospects or results of operations of the Company. 

(w)    “Maturity Date” means August 31, 2022. 

(x)    “New Purchase Price” means the lowest price paid per share in cash for Equity Securities by the
investors in the Initial Public Offering, Next Equity Financing or the Non-Qualified Next Equity Financing, as applicable, other than as a result of conversion of indebtedness (including the Notes). 

  
 4 

 (y)    “Next Equity Financing” means the next sale (or
series of related sales) by the Company of its Equity Securities following the date of this Agreement primarily for bona fide equity financing purposes from which the Company receives gross proceeds of not less than $75,000,000 (excluding the
aggregate amount of debt securities converted into Equity Securities upon conversion of convertible indebtedness, including, without limitation, the Notes converted pursuant to Section 2.2 below). 

(z)    “Non-Qualified Discounted Conversion Price” shall equal
the Discounted Conversion Price unless otherwise agreed between the Company and Requisite Noteholders. 

(aa)    “Non-Qualified Next Equity Financing” means the next
sale (or series of related sales) by the Company of its Equity Securities following the date of this Agreement primarily for bona fide equity financing purposes from which the Company receives gross proceeds of less than $75,000,000 (excluding the
aggregate amount of debt securities converted into Equity Securities upon conversion of convertible indebtedness, including, without limitation, the Notes converted pursuant to Section 2.2 below). 

(bb)    “Notes” means the one or more promissory notes issued to each Lender pursuant to
Section 2.1 below, the form of which is attached hereto as Exhibit A. 
 (cc)    “Person”
means any individual, corporation, partnership, trust, limited liability company, association or other entity. 

(dd)    “Pre-closing Capitalization” means the sum determined
immediately prior to the applicable conversion of the Notes of: 
 (i)    the number of shares of Common Stock of the
Company then outstanding immediately prior to the closing of the applicable conversion event, plus 
 (ii)    the
number of shares of Common Stock issuable, directly or indirectly, upon the exercise or conversion of exercisable or convertible securities (other than the Notes) then outstanding immediately prior to the closing of the applicable conversion event,
plus 
 (iii)    the number of shares of capital stock (determined on an as converted to Common Stock basis) reserved
for issuance under the Company’s equity incentive plans (net of any such shares underlying securities included in clause (ii) of this definition) including, in the event of a conversion of the Notes in the Next Equity Financing, any
increase in the number of such reserved shares expressly required by the terms and conditions of such Next Equity Financing; provided that, for purposes of a conversion pursuant to Section 2.2(d), any shares reserved as part of an equity
incentive plan or employee stock purchase plan adopted in connection with an Initial Public Offering shall not be included in this clause (iii). 
 For the
sake of clarity, in connection with a Qualified SPAC, the Company’s “Pre-closing Capitalization” shall exclude any shares of the SPAC issued or issuable to investors in such Qualified SPAC transaction or related SPAC PIPE Offering.

 (ee)    “Preferred Stock” means shares of preferred stock of the Company. 

  
 5 

 (ff)    “Qualified SPAC” shall mean (i) the
closing of a merger with a publicly listed special purpose acquisition company (a “SPAC”) and (ii) resulting in at least $75,000,000.00 of proceeds to the Company (excluding the aggregate amount of debt securities converted
into Equity Securities upon conversion of convertible indebtedness, including, without limitation, the Notes). 

(gg)    “register,” “registered,” and “registration” shall refer to a
registration effected by preparing and filing a registration statement or similar document in compliance with the Securities Act, and the declaration or ordering of effectiveness of such registration statement or document. 

(hh)    “Registrable Securities” means (i) the Equity Securities issued or issuable, directly or
indirectly, upon conversion of the Notes in accordance with the terms of this Agreement, excluding in all cases, however, any Registrable Securities sold by a Person in a transaction in which his, her or its rights under Section 7.5 of this
Agreement are not assigned, (ii) any shares of Common Stock held by Frazier and (iii) any shares of Common Stock (including shares of Common Stock issuable upon the exercise or conversion of any securities exercisable or convertible into
shares of Common Stock) held by Takeda; excluding for purposes of Sections 7.5 and 8.8 any shares for which registration rights have terminated pursuant to Section 7.5(l) of this Agreement. In addition, the number of shares
of Registrable Securities outstanding shall equal the aggregate of the number of shares of Common Stock outstanding that are, and the number of shares of Common Stock issuable, directly or indirectly, pursuant to then exercisable or convertible
securities that are, Registrable Securities. 
 (ii)    “Requisite Noteholders” means the holders of
not less than a majority in interest of the aggregate outstanding principal amount of the Notes, including Frazier. 

(jj)    “Rule 144” means Rule 144 under the Securities Act. 

(kk)    “Rule 144(b)(1)(i)” means subsection (b)(1)(i) of Rule 144 under the Securities Act as it
applies to Persons who have held shares for more than one (1) year. 
 (ll)    “Rule 405” means
Rule 405 under the Securities Act. 
 (mm)    “SEC” means the Securities and Exchange Commission. 

(nn)    “Securities Act” means the Securities Act of 1933, as amended. 

(oo)    “Shares” means and include any securities of the Company the holders of which are entitled to
vote for one or more members of the Board, including without limitation, all shares of Common Stock, by whatever name called, now owned or subsequently acquired by a stockholder, however acquired, whether through stock splits, stock dividends,
reclassifications, recapitalizations, similar events or otherwise. 

  
 6 

 (pp)     “SPAC PIPE Offering” shall mean an equity
financing in connection with the SPAC for the subscription and purchase of shares of the SPAC on or around the closing of the Qualified SPAC. 

(qq)    “Takeda” means Takeda Vaccines, Inc. 

(rr)    “Takeda Agreements” means the Takeda License, Takeda Supply Agreement and Takeda Equity
Documents. 
 (ss)    “Takeda License” means that certain License Agreement by and between the Company
and Takeda dated July 2, 2021. 
 (tt)     “Takeda Equity Documents” means that certain Stock
Issuance Agreement and Warrant to Purchase Shares of Common Stock by and between the Company and Takeda and the other requisite parties thereto. 

(uu)    “Takeda Supply Agreement” means that certain Clinical Supply Agreement by and between the
Company and Takeda dated July 2, 2021. 
 (vv)    “Transfer” means any sale, assignment,
encumbrance, hypothecation, pledge, conveyance in trust, gift, transfer by bequest, devise or descent, or other transfer or disposition of any kind, including, without limitation, transfers pursuant to divorce or legal separation, transfers to
receivers, levying creditors, trustees or receivers in bankruptcy proceedings or general assignees for the benefit of creditors, whether voluntary, involuntarily or by operation of law, directly or indirectly, of any of the Equity Securities. 

(ww)    “Valuation Cap” means $500,000,000. 

2.    Terms of the Convertible Notes. 

2.1    Issuance of Convertible Notes. In return for the Consideration paid by each Lender, the
Company shall sell and issue to such Lender one or more Notes. Each Note shall have a principal balance equal to the Consideration paid by such Lender for the Note, as set forth in the Schedule of Lenders. Each Note shall be convertible into
Conversion Shares pursuant to Section 2.2 below. 
 2.2    Right to Convert Notes. 

(a)    Next Equity Financing. The then outstanding principal and unpaid accrued interest of each Note shall be
automatically converted into Conversion Shares upon the closing of the Next Equity Financing. Notwithstanding the foregoing, accrued interest on each Note may be paid in cash upon mutual agreement of the Company and the applicable Lender. The number
of Conversion Shares to be issued upon such conversion shall be equal to the quotient obtained by dividing (i) the outstanding principal and unpaid accrued interest on a Note to be converted on the date of conversion by (ii) the Conversion
Price. At least twenty (20) calendar days prior to the closing of the Next Equity Financing, the Company shall notify the holder of each Note in writing of the terms (in reasonable summary detail) under which the Equity Securities will be sold
in such financing. Subject to Section 8.12 below, the issuance of Conversion Shares 

  
 7 

 
pursuant to the conversion of each Note shall otherwise be upon and subject to the same terms and conditions applicable to the Equity Securities sold in the Next Equity Financing. 

(b)    Non-Qualified Next Equity Financing. The then outstanding principal
and unpaid accrued interest of each Note shall be automatically converted, upon the written election of the Requisite Noteholders, into Conversion Shares upon the closing of the Non-Qualified Next Equity
Financing. Notwithstanding the foregoing, accrued interest on each Note may be paid in cash upon mutual agreement of the Company and the applicable Lender. The number of Conversion Shares to be issued upon such conversion shall be equal to the
quotient obtained by dividing (i) the outstanding principal and unpaid accrued interest on a Note to be converted on the date of conversion by (ii) the Conversion Price. At least twenty (20) calendar days prior to the closing of the Non-Qualified Next Equity Financing, the Company shall notify the holder of each Note in writing of the terms (in reasonable summary detail) under which the Equity Securities will be sold in such financing. Subject
to Section 8.12 below, the issuance of Conversion Shares pursuant to the conversion of each Note shall otherwise be upon and subject to the same terms and conditions applicable to the Equity Securities sold in the
Non-Qualified Next Equity Financing. If the Requisite Noteholders elect to convert the Notes into Conversion Shares in connection with the Non-Qualified Next Equity
Financing, the Requisite Noteholders shall inform the Company of such election within twenty (20) calendar days after such notice is effectively given by the Company pursuant to Section 8.5 hereof. In the event that the Requisite
Noteholders fail to inform the Company of such election within such twenty (20) calendar day period, the Notes shall thereafter cease to be convertible into Conversion Shares to be issued pursuant to the
Non-Qualified Next Equity Financing; provided, however, such Note shall continue to accrue interest at the interest rate applicable to such Note until the redemption or conversion thereof.

 (c)    Treatment upon Maturity. If the Next Equity Financing,
Non-Qualified Next Equity Financing pursuant to which such Note has converted, Corporate Transaction or Initial Public Offering has not occurred on or before the Maturity Date, the principal and unpaid accrued
interest of each Note may be converted, at any time following the Maturity Date, at the option of the holder thereof, into Conversion Shares; provided that each Note, to the extent such Note has not already been converted into Conversion Shares at
the option of the holder thereof, shall be due and payable in cash following the Maturity Date solely upon demand of the Requisite Noteholders, which demand notice shall be delivered in writing to the Company and each other Lender in accordance with
Section 8.5 hereof. The number of Conversion Shares to be issued upon conversion shall be equal to the quotient obtained by dividing (i) the outstanding principal and unpaid accrued interest due on a Note to be converted on the date of the
conversion by (ii) the Conversion Price. Notwithstanding anything to contrary in this Section 2.2(c), in the event that a Note is not converted pursuant to this Section 2.2(c) and a Next Equity Financing, Non-Qualified Next Equity Financing pursuant to which such Note has converted, Corporate Transaction or Initial Public Offering has not occurred on or before the third
(3rd) anniversary of the Closing, then on such third (3rd) anniversary, the outstanding principal and accrued interest shall become immediately
due and payable. 
 (d)    Initial Public Offering. Notwithstanding subsections (a), (b) or (c) above, in
the event of an Initial Public Offering prior to full payment of a Note or the prior 

  
 8 

 
conversion of a Note (as provided herein), all outstanding principal and unpaid accrued interest due on such Note shall be converted into Conversion Shares immediately prior to the closing of the
Initial Public Offering. The number of Conversion Shares to be issued upon conversion shall be equal to the quotient, obtained by dividing (x) the outstanding principal and unpaid accrued interest due on a Note to be converted on the date of
the conversion by (y) the Conversion Price. 
 (e)    Corporate Transaction. In the event of a Corporate
Transaction prior to full payment of a Note or the prior conversion of a Note (as provided herein), the greater of (i) an amount equal to two times (2x) the then outstanding principal and accrued interest due on such Note or (ii) an amount
equal to the proceeds (including, for the avoidance of doubt, any escrowed or contingent consideration payable to stockholders in such Corporate Transaction) which would be payable assuming all outstanding principal and unpaid accrued interest due
on such Note were converted into Conversion Shares immediately prior to the closing of the Corporate Transaction shall be due and payable in full prior to the closing of the Corporate Transaction. The number of Conversion Shares which would be
issued upon conversion shall be equal to the quotient, obtained by dividing (x) the outstanding principal and unpaid accrued interest due on a Note to be converted on the date of the conversion by (y) the Conversion Price. 

(f)    Qualified SPAC. The then outstanding principal and unpaid accrued interest of each Note shall be
automatically converted (and each Lender hereby consents to such automatic conversion pursuant to the terms of this Agreement) into Conversion Shares immediately prior to the closing of the Qualified SPAC. The number of Conversion Shares to be
issued upon such conversion shall be equal to the quotient obtained by dividing (i) the outstanding principal and unpaid accrued interest on a Note to be converted on the date of conversion by (ii) the applicable Conversion Price. 

(g)    No Fractional Shares. Upon the conversion of a Note into Conversion Shares, in lieu of any fractional
shares to which the holder of the Note would otherwise be entitled, the Company shall pay the Note holder cash equal to such fraction multiplied by the Conversion Price. 

(h)    Mechanics of Conversion. The Company shall not be required to issue or deliver the Conversion Shares with
respect to any Note until (i) the holder of such Note has (A) surrendered such Note to the Company or (B) provided the Company evidence reasonably satisfactory to the Company of the ownership of and the loss, theft, destruction or
mutilation of such Note, including but not limited to an indemnity agreement reasonably satisfactory in form and amount to the Company, and (ii) (A) the closing of the applicable Next Equity Financing,
Non-Qualified Next Equity Financing pursuant to which such Note is converted, Initial Public Offering, Corporate Transaction or Qualified SPAC, or (B) the Maturity Date in the event such Note converts
pursuant to Section 2.2(c). Additionally, before any Note holder shall be entitled to convert such holder’s Note into Conversion Shares pursuant to Section 2.2(b), such holder shall give written notice to the Company of the election
to convert such Note into Conversion Shares. 
 3.    Closing Mechanics. 

3.1    Closing. The closing (the “Closing”) of the purchase of the Notes in return
for the Consideration paid by each Lender (as set forth on the Schedule of Lenders) 

  
 9 

 
shall take place remotely via teleconference, e-mail or likewise at 10 a.m., on August 31, 2021, or at such other time and place as the Company and
Lenders purchasing a majority in interest of the aggregate principal amount of the Notes to be sold at the Closing agree upon orally or in writing. At the Closing, each Lender shall deliver the Consideration to the Company set forth opposite such
Lender’s name on the Schedule of Lenders and the Company shall deliver to each Lender one or more executed Notes in return for the respective Consideration provided to the Company. In the event that payment by a Lender is made, in whole or in
part, by cancellation or exchange of indebtedness, then such Lender shall surrender to the Company for cancellation or exchange at the Closing any evidence of such indebtedness. 

3.2    Conditions of Lenders’ Obligations at Closing. The obligations of each
Lender under Section 3.1 of this Agreement are subject to the fulfillment on or before such Closing of each of the following conditions, the waiver of which shall not be effective against any Lender who does not consent thereto: 

(a)    Representations and Warranties. The representations and warranties of the Company contained in
Section 4 shall be true on and as of the Closing. 
 (b)    Proceedings and Documents. All corporate and
other proceedings in connection with the transactions contemplated at the Closing and all documents incident thereto shall be reasonably satisfactory in form and substance to the special counsel for the Lenders, and they shall have received all such
counterpart original and certified or other copies of such documents as they may reasonably request. 
 (c)    Board
of Directors. On or prior to the Closing, the directors of the Company shall be Robert Hershberg, M.D., Ph.D., Patrick Heron, Jaime Sepulveda, M.D., M.P.H., Ph.D., Susan Silbermann, Julie Gerberding, M.D., M.P.H., Jeryl Hilleman, Shelley Chu,
M.D., Ph.D. Elise Wang and Rajeev Venkayya and there shall be one vacancy on the Board. 
 (d)    Management Rights
Letter. On or prior to the Closing, the Company and each Lender that has requested one shall have entered into a Management Rights Letter in the forms attached hereto as Exhibit D. 

(e)    Indemnification Agreement. The Company and each member of the Board shall have entered into an
Indemnification Agreement in the form attached hereto as Exhibit E. 
 (f)    Issuance of
Notes. Such Lender shall have received from the Company a duly executed Note as required by this Agreement. 

3.3     Conditions of the Company’s Obligations at Closing. The obligations of
the Company to each Lender under this Agreement are subject to the fulfillment on or before the Closing of each of the following conditions by that Lender: 

(a)    Representations and Warranties. The representations and warranties of the Lenders contained in
Section 5 shall be true on and as of the Closing. 

  
 10 

 (b)    Payment of Consideration. The Lender shall have
delivered the Consideration specified in Section 3.1. 
 4.    Representations and Warranties of the
Company. The Company hereby represents and warrants to each Lender that, except as set forth on the Disclosure Schedule attached as Exhibit F to this Agreement, which exceptions shall be deemed to be part of the representations and
warranties made hereunder, the following representations are true and complete as of the date of the Closing, except as otherwise indicated. The Disclosure Schedule shall be arranged in sections corresponding to the numbered and lettered sections
and subsections contained in this Section 4, and the disclosures in any section or subsection of the Disclosure Schedule shall qualify other sections and subsections in this Section 4 only to the extent it is readily apparent from a
reading of the disclosure that such disclosure is applicable to such other sections and subsections. 

4.1    Organization, Good Standing and Qualification. The Company is a corporation duly
incorporated and organized, validly existing, and in good standing under the laws of the State of Delaware and has all requisite corporate power and authority to own and operate its properties and assets and to carry on its business as now
conducted. The Company is duly qualified to transact business and is in good standing in each jurisdiction in which the failure to so qualify would have a Material Adverse Effect. 

4.2    Capitalization. 

(a)    The authorized capital of the Company consists, immediately prior to the Closing, of 10,000,000 shares of Common
Stock, 5,663,000 of which are issued and outstanding immediately prior to the Closing. All of the outstanding shares of Common Stock have been duly authorized, are fully paid and nonassessable and were issued in compliance with all applicable
federal and state securities laws. 
 (b)    The Company has not authorized any shares of Preferred Stock. 

(c)    1,766,500 shares of Common Stock are authorized for issuance to employees, consultants and directors pursuant to
the HilleVax, Inc. 2021 Equity Incentive Plan, none of which are subject to outstanding option awards. 

(d)    Section 4.2(d) of the Disclosure Schedule sets forth the capitalization of the Company immediately following the
Closing including the number of shares of the following: (i) issued and outstanding Common Stock, including, with respect to restricted Common Stock, vesting schedule and repurchase price; and (ii) warrants or stock purchase rights, if
any. Except for (A) the conversion privileges of the Notes to be issued under this Agreement, (B) the rights provided in Section 7.2 of this Agreement, and (C) the securities and rights described in Section 4.2(d) of the
Disclosure Schedule, there are no outstanding options, warrants, rights (including conversion or preemptive rights and rights of first refusal or similar rights) or agreements, orally or in writing, to purchase or acquire from the Company any shares
of Common Stock, or any securities convertible into or exchangeable for shares of Common Stock. All outstanding shares of the Company’s Common Stock and all shares of the Company’s Common Stock underlying outstanding options are subject to
(i) a right of first refusal in favor of the Company upon any proposed transfer (other than transfers for estate planning purposes); and (ii) 

  
 11 

 
a lock-up or market standoff agreement of not less than one hundred eighty (180) days following the Initial Public Offering pursuant to a registration
statement filed with the SEC under the Securities Act. 
 (e)    Unless otherwise set forth in Section 4.2(d) of
the Disclosure Schedule, none of the Company’s stock purchase agreements contains a provision for acceleration of vesting (or lapse of a repurchase right) or other changes in the vesting provisions or other terms of such agreement or
understanding upon the occurrence of any event or combination of events. The Company has never adjusted or amended the exercise price of any stock options previously awarded, whether through amendment, cancellation, replacement grant, repricing, or
any other means. The Company has no obligation (contingent or otherwise) to purchase or redeem any of its capital stock. 

4.3    Subsidiaries. The Company does not currently own or control, directly or indirectly, any
interest in any other corporation, partnership, trust, joint venture, limited liability company, association, or other business entity. The Company is not a participant in any joint venture, partnership or similar arrangement. 

4.4    Authorization. Except for the authorization and issuance of the shares issuable, directly or
indirectly, in connection with the conversion of the Notes, all corporate action has been taken on the part of the Company, its officers, directors and stockholders necessary for the authorization, execution, delivery and performance of this
Agreement and the Notes. Except as may be limited by applicable bankruptcy, insolvency, reorganization, or similar laws relating to or affecting the enforcement of creditors’ rights, the Company has taken all corporate action required to make
all of the obligations of the Company reflected in the provisions of this Agreement and the Notes, the valid and enforceable obligations they purport to be. 

4.5    Compliance with Other Instruments. The Company is not in violation or default (i) of
any provisions of its Certificate of Incorporation or Bylaws, (ii) of any instrument, judgment, order, writ or decree, (iii) under any note, indenture or mortgage, (iv) under any lease, agreement, contract or purchase order to which
it is a party or by which it is bound that is required to be listed on the Disclosure Schedule, or (v) to its knowledge, of any provision of federal or state statute, rule or regulation applicable to the Company, the violation of which
would have a Material Adverse Effect. The execution, delivery and performance of this Agreement and the issuance and delivery of the Notes and the Conversion Shares, and any shares of Common Stock directly or indirectly issued in respect thereof,
and the consummation of the transactions contemplated hereby and thereby will not result in any such violation or be in conflict with or constitute, with or without the passage of time and giving of notice, either (i) a default under any such
provision, instrument, judgment, order, writ, decree, contract or agreement; or (ii) an event which results in the creation of any lien, charge or encumbrance upon any assets of the Company or the suspension, revocation, forfeiture, or
nonrenewal of any material permit or license applicable to the Company. 
 4.6    Governmental
Consents and Filings. Assuming the accuracy of the representations made by the Lenders in Section 5 of this Agreement, no consent, approval, order or authorization of, or registration, qualification, designation,

  
 12 

 
declaration or filing with, any federal, state or local governmental authority is required on the part of the Company in connection with the consummation of the transactions contemplated by this
Agreement, other than a Form D or other qualifications or filings under applicable federal and state securities laws, which qualification or filings will be made on a timely basis. 

4.7    Litigation. There is no claim, action, suit, proceeding, arbitration, complaint, charge or
investigation pending or to the Company’s knowledge, currently threatened in writing (i) against the Company or any officer, director or Key Employee of the Company arising out of their employment or board relationship with the Company;
(ii) that questions the validity of this Agreement or the Notes or the right of the Company to enter into them, or to consummate the transactions contemplated hereby or thereby; or (iii) to the Company’s knowledge, that would
reasonably be expected to have, either individually or in the aggregate, a Material Adverse Effect. Neither the Company nor, to the Company’s knowledge, any of its officers, directors or Key Employees is a party or is named as subject to the
provisions of any order, writ, injunction, judgment or decree of any court or government agency or instrumentality (in the case of officers, directors or Key Employees, such as would affect the Company). There is no action, suit, proceeding or
investigation by the Company pending or which the Company intends to initiate. The foregoing includes, without limitation, actions, suits, proceedings or investigations pending or threatened in writing (or any basis therefor known to the Company)
involving the prior employment of any of the Company’s employees, their services provided in connection with the Company’s business, any information or techniques allegedly proprietary to any of their former employers or their obligations
under any agreements with prior employers. 
 4.8    Intellectual Property. Except as set forth
in Section 4.8 of the Disclosure Schedule, the Company owns or possesses all Company Intellectual Property without any known conflict with, or infringement of, the rights of others, including prior employees or consultants, or academic or
medical institutions with which any of them may be affiliated now or may have been affiliated in the past. To the Company’s knowledge, no product or service marketed or sold (or proposed to be marketed or sold) by the Company violates or will
violate any license or infringes or will infringe any intellectual property rights of any other party in the absence of a license to such intellectual property rights. Other than with respect to the Takeda Agreements or commercially available
software products under standard end-user object code license agreements, there are no outstanding options, licenses, agreements, claims, encumbrances or shared ownership interests of any kind relating to the
Company Intellectual Property, nor is the Company bound by or a party to any options, licenses or agreements of any kind with respect to the patents, trademarks, service marks, trade names, copyrights, trade secrets, licenses, information,
proprietary rights and processes of any other Person. The Company has not received any communications alleging that the Company has infringed, or by conducting its business, would infringe any of the patents, trademarks, service marks, tradenames,
copyrights, trade secrets, mask works or other proprietary rights or processes of any other Person. To the Company’s knowledge, no third party is infringing any of the Company Intellectual Property. The Company has obtained and possesses valid
licenses to use all of the software programs present on the computers and other software-enabled electronic devices that it owns or leases or that it has otherwise provided to its employees for 

  
 13 

 
their use in connection with the Company’s business. To the Company’s knowledge, it will not be necessary to use any inventions of any of its employees or consultants (or Persons it
currently intends to hire) made prior to their employment by the Company that are not otherwise the subject of the Takeda Agreements, including prior employees or consultants, or academic or medical institutions with which any of them may be
affiliated now or may have been affiliated in the past. Each employee and consultant has assigned to the Company all intellectual property rights that he, she or it solely or jointly conceived, reduced to practice, developed or made during the
period of his, her or its employment or consulting relationship with the Company that (a) relate, at the time of conception, reduction to practice, development, or making of such intellectual property right, to the Company’s business as
then conducted or as then proposed to be conducted, (b) were developed on any amount of the Company’s time or with the use of any of the Company’s equipment, supplies, facilities or information or (c) resulted from the
performance of services for the Company. Section 4.8 of the Disclosure Schedule lists all patents, patent applications, registered trademarks, trademark applications, service marks, service mark applications, tradenames, registered copyrights,
and licenses to and under any of the foregoing, in each case owned by the Company. The Company has not embedded any open source, copyleft or community source code in any of its products generally available or in development, including but not
limited to any libraries or code licensed under any General Public License, Lesser General Public License or similar license arrangement. For purposes of this Section 4.8, the Company shall be deemed to have knowledge of a patent right if the
Company has actual knowledge of the patent right or would be found to be on notice of such patent right as determined by reference to United States patent laws. No government funding, facilities of a university, college, other educational
institution or research center, was used in the development of any Company Intellectual Property that is owned by the Company. To the Company’s knowledge, no Person who was involved in, or who contributed to, the creation or development of any
Company Intellectual Property, has performed services for the government, university, college, or other educational institution or research center in a manner that would adversely affect the Company’s rights in the Company Intellectual
Property.  
 4.9    Property. The property
and assets that the Company owns are free and clear of all mortgages, deeds of trust, liens, loans and encumbrances, except for statutory liens for the payment of current taxes that are not yet delinquent and encumbrances and liens that arise in the
ordinary course of business and do not materially impair the Company’s ownership or use of such property or assets. With respect to the property and assets it leases, the Company is in compliance with such leases and holds a valid
leasehold interest free of any liens, claims or encumbrances other than those of the lessors of such property or assets. The Company does not own any real property. 

4.10    Absence of Undisclosed Liabilities. The Company does not have any liability or obligation of any nature,
whether accrued, absolute, contingent or otherwise, asserted or unasserted, known or unknown, in any case which has, or is reasonably likely to have, a Material Adverse Effect. The Company has not assumed, guaranteed, endorsed or otherwise become
directly or contingently liable on or for any indebtedness of any other Person. 
 4.11    Valid
Issuance of Conversion Shares. The Conversion Shares to be issued, sold and delivered upon conversion of the Notes and any shares of Common Stock 

  
 14 

 
issued or issuable in respect thereof, will be duly and validly issued, fully paid and nonassessable and, based in part upon the representations and warranties of the Lenders in this Agreement,
will be issued in compliance with all applicable federal and state securities laws. 

4.12    CFIUS. The Company does not produce, design, test, manufacture, fabricate, or develop one
or more “critical technologies,” as that term is defined at 31 C.F.R. § 800.215. 

4.13    Disclosure. The Company has made available to the Lenders all the information reasonably
available to the Company that the Lenders have requested for deciding whether to purchase the Notes. No representation or warranty of the Company contained in this Agreement, as qualified by the Disclosure Schedule, and no certificate furnished or
to be furnished to the Lenders at the Closing contains any untrue statement of a material fact or, to the Company’s knowledge, omits to state a material fact necessary in order to make the statements contained herein or therein not misleading
in light of the circumstances under which they were made. It is understood that this representation is qualified by the fact that the Company has not delivered to the Lenders, and has not been requested to deliver, a private placement or similar
memorandum or any written disclosure of the types of information customarily furnished to purchasers of securities. 

4.14    Absence of Side Letters. Except as set forth on Section 4.14 of the Disclosure Schedule and as
contemplated in this Agreement and the Notes, there are no additional agreements, understandings or “side letters” between the Company and any of the Lenders with respect to the transactions contemplated hereby. 

4.15    Preclinical Development and Clinical Trials. Except as set forth in Section 4.15 of the Disclosure
Schedule, the studies, tests, preclinical development and clinical trials, if any, conducted by or on behalf of the Company are being conducted in all material respects in accordance with all applicable laws and regulations, including the Federal
Food, Drug, and Cosmetic Act. Except as set forth in Section 4.15 of the Disclosure Schedule, the Company is not aware of any studies, tests, development or trials the results of which reasonably call into question the results of the studies,
tests, development and trials conducted by or on behalf of the Company, and the Company has not received any written notices or correspondence from the U.S. Food and Drug Administration (“FDA”) or any other governmental entity or
any institutional review board or comparable authority requiring the termination or suspension of any studies, tests, preclinical development or clinical trials conducted by or on behalf of the Company. 

4.16    FDA Approvals. The Company possesses all permits, licenses, registrations, certificates, authorizations,
orders and approvals from the appropriate federal, state or foreign regulatory authorities necessary to conduct its business as now conducted (collectively, “Permits”), except where the failure to possess such Permits would not,
individually or in the aggregate, reasonably be expected to have a Material Adverse Effect. The Company has not received any notice of proceedings relating to the suspension, modification, revocation or cancellation of any material Permit. Neither
the Company nor, to the Company’s knowledge, any officer, employee or agent of the Company has been convicted of any crime or engaged in any conduct that has previously caused or would reasonably be expected to result in
(A) disqualification or debarment by the FDA under 21 U.S.C. Sections 335(a) or (b), or any similar 

  
 15 

 
law, rule or regulation of any other governmental entities, (B) debarment, suspension, or exclusion under any federal healthcare programs or by the General Services Administration, or
(C) exclusion under 42 U.S.C. Section 1320a-7 or any similar law, rule or regulation of any governmental entities. Neither the Company nor any of its officers, employees, or, to the Company’s
knowledge, any of its contractors or agents is the subject of any pending or, to the Company’s knowledge, threatened investigation by FDA pursuant to its “Fraud, Untrue Statements of Material Facts, Bribery, and Illegal Gratuities”
policy as stated at 56 Fed. Reg. 46191 (September 10, 1991) (the “FDA Application Integrity Policy”) and any amendments thereto, or by any other similar governmental entity pursuant to any similar policy. Neither the Company nor, to
the Company’s knowledge, any of its officers, employees, contractors, and agents has committed any act, made any statement or failed to make any statement that would reasonably be expected to provide a basis for FDA to invoke the FDA
Application Integrity Policy or for any similar governmental entity to invoke a similar policy. 
 4.17    FDA
Regulation. The Company is and has been in compliance with all applicable laws administered or issued by the FDA or any similar governmental entity, except where the failure to so comply would not, individually or in the aggregate, reasonably be
expected to have a Material Adverse Effect. 
 5.    Representations, Warranties and Additional Agreements of the
Lenders. 
 5.1    Representations and Warranties of the Lenders. In connection with the
transactions provided for herein, each Lender hereby represents and warrants to the Company that, solely with respect to such Lender (and not with respect to any other Lender): 

(a)    Authorization. This Agreement constitutes such Lender’s valid and legally binding obligation,
enforceable in accordance with its terms, except as may be limited by (i) applicable bankruptcy, insolvency, reorganization, or similar laws relating to or affecting the enforcement of creditors’ rights and (ii) laws relating to the
availability of specific performance, injunctive relief or other equitable remedies. Each Lender represents that it has full power and authority to enter into this Agreement. 

(b)    Purchase Entirely for Own Account. Each Lender acknowledges that this Agreement is made with Lender in
reliance upon such Lender’s representation to the Company that the Notes, the Conversion Shares, and any Common Stock issuable, directly or indirectly, upon conversion of the Conversion Shares (collectively, the “Securities”)
will be acquired for investment for Lender’s own account, not as a nominee or agent, and not with a view to the resale or distribution of any part thereof, and that such Lender has no present intention of selling, granting any participation in,
or otherwise distributing the same. By executing this Agreement, each Lender further represents that such Lender does not have any contract, undertaking, agreement or arrangement with any person to sell, transfer or grant participations to such
person or to any third person, with respect to the Securities. 
 (c)    Disclosure of Information. Each Lender
acknowledges that it has received all the information it considers necessary or appropriate for deciding whether to acquire the Securities. Each Lender further represents that it has had an opportunity to ask questions and

  
 16 

 
receive answers from the Company regarding the terms and conditions of the offering of the Securities. 

(d)    Investment Experience. Each Lender is an investor in securities of companies in the development stage and
acknowledges that it is able to fend for itself, can bear the economic risk of its investment and has such knowledge and experience in financial or business matters that it is capable of evaluating the merits and risks of the investment in the
Securities. If other than an individual, each Lender also represents it has not been organized solely for the purpose of acquiring the Securities. 

(e)    Accredited Investor. Each Lender is an “accredited investor” within the meaning of Rule 501 of
Regulation D promulgated under the Securities Act, as presently in effect (“Rule 501”). If such Lender has been organized for the purpose of acquiring the Securities, each holder of securities of such Lender, or holder of any right
to acquire such securities or any of the Securities, is an “accredited investor” pursuant to Rule 501. 

(f)    Restricted Securities. Each Lender understands that the Securities are characterized as “restricted
securities” under the federal securities laws inasmuch as they are being acquired from the Company in a transaction not involving a public offering and that under such laws and applicable regulations such securities may be resold without
registration under the Securities Act only in certain limited circumstances. Each Lender represents that it is familiar with Rule 144 and understands the resale limitations imposed thereby and by the Securities Act. 

5.2    Further Limitations on Disposition. Without in any way limiting the representations and
warranties set forth above, until the end of the applicable market stand-off period contemplated under Section 8.11 (or any similar lock-up period) following the
Initial Public Offering, each Lender further agrees not to make any disposition of all or any portion of the Securities unless and until the transferee has agreed in writing for the benefit of the Company to be bound by this Section 5 and
Section 8.11 and the transferring Lender has notified the Company of the proposed disposition and has furnished the Company with a detailed statement of the circumstances surrounding the proposed disposition. It is agreed that the Company will
not require opinions of counsel for transactions made pursuant to Rule 144. 
 Lender shall not make any disposition of any of the
Securities to any person that would result in the Company being ineligible to rely on Rule 506 of Regulation D in regards to the issuance of the Securities or any subsequent issuance of securities of the Company, as such in either case is in good
faith determined by the Company. 
 Notwithstanding anything herein to the contrary, each Lender may freely transfer the Securities to its
Affiliates without restriction. 
 5.3    Legends. It is understood that the Securities may bear
the following legend: 
 “THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “ACT”).
THEY MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED, HYPOTHECATED, OR OTHERWISE TRANSFERRED EXCEPT PURSUANT TO AN EFFECTIVE 

  
 17 

 
REGISTRATION STATEMENT UNDER THE ACT OF 1933 OR SUCH TRANSFER IS EXEMPT FROM THE REGISTRATION AND PROSPECTUS DELIVERY REQUIREMENTS OF SAID ACT.” 

5.4    Bad Actor Representations and Covenants. Each Lender that is among the Persons identified in
Rule 506(d)(1) of Regulation D (a “Covered Person”) hereby represents and warrants to the Company that such Lender has not been convicted of any of the felonies or misdemeanors or has been subject to any of the orders, judgments,
decrees or other conditions set forth in Rule 506(d) of Regulation D promulgated by the SEC, which are excerpted in their current form on Exhibit B. Each Lender covenants that if it is then a Covered Person to provide immediate written notice
to the Company in the event such Lender is convicted of any felony or misdemeanor or becomes subject to any order, judgment, decree or other condition set forth in Rule 506(d) of Regulation D promulgated by the SEC, as may be amended from time to
time. Each Lender covenants to provide such information to the Company as the Company may reasonably request in order to comply with the disclosure obligations set forth in Rule 506(e) of Regulation D promulgated by the SEC, as may be amended from
time to time. 
 5.5    Exculpation Among Lenders. Each Lender acknowledges that it is not
relying upon any person, firm or corporation, other than the Company, in making its investment or decision to invest in the Company. Each Lender agrees that no Lender nor the respective controlling persons, officers, directors, partners, agents, or
employees of any Lender shall be liable to any other Lender for any action heretofore or hereafter taken or omitted to be taken by any of them in connection with the purchase of the Securities. 

6.    Defaults and Remedies. 

6.1    Events of Default. Any of the following events shall be considered an “Event of
Default” with respect to each Note: 
 (a)    The Company shall default in the payment of any part of the
principal or unpaid accrued interest on the Note, (i) for more than two (2) days after demand for payment therefor by the Requisite Noteholders following the Note becoming due and payable pursuant to the terms and conditions of the Notes,
(ii) following the third (3rd) anniversary of the Closing, for more than two (2) days after demand for payment therefor by any Lender pursuant to the terms and conditions of this
Agreement, or (iii) after a date fixed by acceleration or otherwise; 
 (b)    The Company shall make an
assignment for the benefit of creditors, or shall admit in writing its inability to pay its debts as they become due, or shall file a voluntary petition for bankruptcy, or shall file any petition or answer seeking for itself any reorganization,
arrangement, composition, readjustment, dissolution or similar relief under any present or future statute, law or regulation, or shall file any answer admitting the material allegations of a petition filed against the Company in any such proceeding,
or shall seek or consent to or acquiesce in the appointment of any trustee, receiver or liquidator of the Company, or of all or any substantial part of the properties of the Company, or the Company or its respective directors or majority
stockholders shall take any action looking to the dissolution or liquidation of the Company; 

  
 18 

 (c)    Within thirty (30) days after the commencement of any
proceeding against the Company seeking any bankruptcy reorganization, arrangement, composition, readjustment, liquidation, dissolution or similar relief under any present or future statute, law or regulation, such proceeding shall not have been
dismissed, or within thirty (30) days after the appointment without the consent or acquiescence of the Company of any trustee, receiver or liquidator of the Company or of all or any substantial part of the properties of the Company, such
appointment shall not have been vacated; 
 (d)    Within thirty (30) days after the Company becomes involved in
litigation that threatens to materially and adversely affect the Company’s business, operations, assets, results of operations or prospects, if the Company’s involvement has not terminated by such date in a manner that does not and could
not reasonably be expected to materially and adversely affect the Company’s business, operations, assets, results of operations or prospects; 

(e)    Any default or defined event of default that has not otherwise been cured or forgiven within fifteen
(15) days after written notice to the Company from the applicable lender of such default or defined event of default shall occur under any agreement to which the Company is a party that evidences indebtedness for borrowed money by the Company
(excluding trade payables) of $50,000 or more; or 
 (f)    The Company shall fail to observe or perform any other
obligation to be observed or performed by it under this Agreement or the Notes within fifteen (15) days after written notice from the Requisite Noteholders to perform or observe such obligation. 

6.2    Remedies. Upon the occurrence of an Event of Default under Section 6.1 hereof, at the
option and upon the declaration of the Requisite Noteholders (or, following the three year anniversary of the Closing, at the option and upon declaration of any Lender), the entire unpaid principal and accrued and unpaid interest on the Notes shall,
without presentment, demand, protest, or notice of any kind, all of which are hereby expressly waived, be forthwith due and payable, and such Requisite Noteholders (or, following the three year anniversary of the Closing, such individual Lender)
may, immediately and without expiration of any period of grace, enforce payment of all amounts due and owing under such Notes and exercise any and all other remedies granted to them at law, in equity or otherwise. 

7.    Covenants of the Company; Rights of the Holders of the Notes. 

7.1    Delivery of Financial Statements; Inspection Rights. 

(a)    The Company shall deliver to each Lender: 

(i)    as soon as practicable, but in any event within one hundred twenty (120) days after the end of each fiscal
year of the Company (beginning with the fiscal year ending December 31, 2021), an income statement for such fiscal year and a balance sheet of the Company, and a statement of cash flows for such year, such
year-end financial reports to be in reasonable detail, prepared in accordance with generally accepted accounting principles (“GAAP”), and audited and certified by independent public
accountants of nationally recognized standing selected by the Company; 

  
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 (ii)    as soon as practicable, but in any event within forty-five
(45) days after the end of each of the first three (3) quarters of each fiscal year of the Company, an unaudited income statement and statement of cash flows for such fiscal quarter and an unaudited balance sheet as of the end of such
fiscal quarter, all prepared in accordance with GAAP (except that such financial statements may (A) be subject to normal year-end audit adjustments and (B) not contain all notes thereto that may be
required in accordance with GAAP); 
 (iii)    as soon as practicable, but in any event at least thirty (30) days
prior to the end of each fiscal year, a budget and business plan for the next fiscal year, prepared on a monthly basis, including balance sheets, income statements and statements of cash flows for such months and, as soon as prepared, any other
budgets or revised budgets prepared by the Company; 
 (iv)    as soon as practicable, but in any event within thirty
(30) days after the end of each fiscal quarter of the Company, a statement showing the number of shares of each class and series of capital stock and securities convertible into or exercisable for shares of capital stock outstanding at the end
of the period, the Common Stock issuable upon conversion or exercise of any outstanding securities convertible or exercisable for Common Stock and the exchange ratio or exercise price applicable thereto, and the number of shares of issued stock
options and stock options not yet issued but reserved for issuance, if any, all in sufficient detail as to permit the Lenders to calculate their respective percentage ownership in the Company; 

(v)    such other information relating to the financial condition, business or corporate affairs of the Company as the
Requisite Noteholders may from time to time reasonably request; provided, however, that the Company shall not be obligated under this subsection (iv) or any other subsection of Section 7.1 to provide information that
(A) it deems in good faith to be a trade secret or similar highly sensitive confidential information or (B) the disclosure of which would adversely affect the attorney-client privilege between the Company and its counsel; and 

(b)    Notwithstanding anything else in this Section 7.1 to the contrary, the Company may cease providing the
information set forth in this Section 7.1 during the period starting with the date thirty (30) days before the Company’s good-faith estimate of the date of filing of a registration statement if it reasonably concludes it must do so to
comply with the SEC rules applicable to such registration statement and related offering; provided that the Company’s covenants under this Section 7.1 shall be reinstated at such time as the Company is no longer actively employing its
commercially reasonable efforts to cause such registration statement to become effective. 
 (c)    Inspection.
The Company shall permit each Lender, at such Lender’s expense, to visit and inspect the Company’s properties, to examine its books of account and records and to discuss the Company’s affairs, finances and accounts with its officers,
all at such reasonable times as may be requested by the Lender; provided, however, that the Company shall not be obligated pursuant to this Section 7.1 to provide access to any information that (A) it deems in good faith to
be a trade secret or similar confidential information or (B) the disclosure of which would adversely affect the attorney-client privilege between the Company and its counsel. 

  
 20 

 (d)    Termination of Information and Inspection Covenants. The
covenants set forth in Sections 7.1(a), 7.1(b) and 7.1(c) shall terminate and be of no further force or effect upon the earlier to occur of (i) the consummation of the Initial Public Offering, (ii) when the Company first becomes
subject to the periodic reporting requirements of Sections 12(g) or 15(d) of the Exchange Act, whichever event shall first occur, (iii) the Next Equity Financing, (iv) a Non-Qualified Next
Equity Financing into which such Lender’s Note converts and (v) the consummation of a Corporate Transaction; provided in the case of (iii) or (iv), the Lender receives similar rights under the applicable financing documents for such
transaction, and in the case of (v), that the consideration received is either (A) cash or (B) securities of a company registered under, and in compliance with its obligations under the Exchange Act. 

7.2    Right of First Offer. Subject to the terms and conditions specified in this
Section 7.2, the Company hereby grants to Takeda and each Lender a right of first offer with respect to future sales by the Company of its Shares (as hereinafter defined). For purposes of this Section 7.2, the term
“Lender” includes any general partners and Affiliates of a Lender. Takeda and each Lender shall be entitled to apportion the right of first offer hereby granted it among itself and its partners and Affiliates in such proportions as
it deems appropriate. 
 Each time the Company proposes to offer any shares of, or securities convertible into or exchangeable or
exercisable for any shares of, its capital stock (including, without limitation, any such shares or securities issued in connection with debt securities) (“Shares”), the Company shall first make an offering of such Shares to Takeda
and each Lender in accordance with the following provisions: 
 (a)    The Company shall deliver a notice in accordance
with Section 8.5 (“Notice”) to Takeda and the Lenders stating (i) its bona fide intention to offer such Shares, (ii) the number of such Shares to be offered and (iii) the price and terms upon which it proposes to
offer such Shares. 
 (b)    By written notification received by the Company within ten (10) calendar days after
the giving of Notice, Takeda and each Lender may elect to purchase, at the price and on the terms specified in the Notice, up to that portion of such Shares that equals the following: (i) with respect to Takeda, fifteen percent (15%) of such
Shares; and (ii) with respect to each Lender, such Lender’s respective pro rata portion of eighty five (85%) of such Shares determined in the proportion that the principal outstanding under the Note(s) held by such Lender bears to the
total principal outstanding under the Notes held by all the Lenders; provided, that if Takeda does not elect to purchase the full amount of Shares to which it is entitled to purchase under this Section 7.2(b)(i), then each Lender shall
have a right to elect to purchase its pro rata portion of any such remaining Shares not purchased by Takeda pursuant to the provisions of this Section 7.2(b)(ii). 

(c)    If all Shares that Takeda and the Lenders are entitled to obtain pursuant to Section 7.2(b) of this Agreement
are not elected to be obtained as provided in Section 7.2(b) of this Agreement, the Company may, during the ninety (90) day period following the expiration of the period provided in Section 7.2(b) of this Agreement, offer the
remaining unsubscribed portion of such Shares to any Person or Persons at a price not less than that, and upon terms no more favorable to the offeree than those, specified in the Notice. If the Company does

  
 21 

 
not enter into an agreement for the sale of the Shares within such period, or if such agreement is not consummated within sixty (60) days of the execution thereof, the right provided
hereunder shall be deemed to be revived and such Shares shall not be offered unless first reoffered to Takeda and the Lenders in accordance herewith. 

(d)    The right of first offer in this Section 7.2 shall not be applicable to (i) the issuance or sale of
shares of Common Stock (or options therefor) (appropriately adjusted for any stock split, dividend, combination or other recapitalization) to employees, directors, consultants and other service providers for the primary purpose of soliciting or
retaining their services pursuant to plans or agreements approved by the Board; (ii) the issuance of securities in the Initial Public Offering; (iii) the issuance of securities pursuant to the conversion or exercise of convertible or
exercisable securities; (iv) the issuance of securities in connection with a bona fide business acquisition by the Company, whether by merger, consolidation, sale of assets, sale or exchange of stock or otherwise; (v) the issuance of
Conversion Shares upon conversion of the Notes (but, for the purposes of clarity, not the Equity Securities that trigger the issuance of the Conversion Shares); or (vi) the issuance of stock, warrants or other securities or rights pursuant to
any equipment leasing arrangement or debt financing arrangement; provided such issuances are approved by the Board and (except for the Initial Public Offering) are primarily for non-equity financing
purposes. In addition to the foregoing, the right of first offer in this Section 7.2 shall not be applicable with respect to any Lender in any subsequent offering of Shares if (i) at the time of such offering, the Lender is not an
“accredited investor,” as that term is then defined in Rule 501(a) of the Securities Act and (ii) such offering of Shares is otherwise being offered only to accredited investors. 

(e)    The rights provided in this Section 7.2 may not be assigned or transferred by any Lender; provided,
however, that a Lender that is a venture capital fund, private equity investor, investment company or investment advisor may assign or transfer such rights to its Affiliates. 

(f)    The right of first offer in this Section 7.2, including notice with respect thereto, applicable to Takeda may
be waived by Takeda with the written consent of Takeda. The right of first offer in this Section 7.2, including notice with respect thereto, may be waived by all Lenders with the written consent of the Requisite Noteholders; provided, in the
event any Lender consents to the waiver of the provisions of this Section 7.2 with respect to any offering of Shares by the Company and actually purchases any such Shares in such offering, then each other Lender who did not consent to such
waiver shall be permitted to participate in such offering (which may, at the Company’s option, be in a subsequent closing of such offering on substantially the same terms and conditions) on a pro rata basis (based on the level of participation
of the Lender purchasing the largest portion of such Lender’s pro rata share). Takeda’s and the Requisite Noteholders’ right to waive the provisions of this Section 7.2 shall be independent of one another. 

(g)    The covenants set forth in this Section 7.2 shall terminate and be of no further force or effect upon
(i) the consummation of the Initial Public Offering, (ii) when the Company first becomes subject to the periodic reporting requirements of Sections 12(g) or 15(d) of the Exchange Act and (iii) upon the consummation of a Corporate
Transaction, whichever event shall first occur. 

  
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 7.3    Rights of Refusal. 

(a)    Transfer Notice. If at any time a Common Holder proposes to Transfer Equity Securities (a “Selling
Common Holder”), then the Selling Common Holder shall promptly give the Company and each Lender written notice of the Selling Common Holder’s intention to make the Transfer (the “Transfer Notice”). The Transfer Notice
shall include (i) a description of the Equity Securities to be transferred (the “Offered Shares”), (ii) the name(s) and address(es) of the prospective transferee(s), (iii) the purchase price and form of consideration
proposed to be paid for the Offered Shares and (iv) the other material terms and conditions upon which the proposed Transfer is to be made. The Transfer Notice shall certify that the Selling Common Holder has received a firm offer from the
prospective transferee(s) and in good faith believes a binding agreement for the Transfer is obtainable on the terms set forth in the Transfer Notice. The Transfer Notice shall also include a copy of any written proposal, term sheet or letter of
intent or other agreement relating to the proposed Transfer. In the event that the transfer is being made pursuant to the provisions of Section 7.3, the Transfer Notice shall state under which specific clause of Section 7.3 the Transfer is
being made. 
 (b)    Company’s Right of First Refusal. The Company shall have an option for a period of
ten (10) days from delivery of the Transfer Notice in accordance with Section 8.5 to elect to purchase the Offered Shares at the same price and subject to the same material terms and conditions as described in the Transfer Notice. The
Company may exercise such purchase option and purchase all or any portion of the Offered Shares by notifying the Selling Common Holder in writing before expiration of such ten (10) day period as to the number of such shares that it wishes to
purchase. If the Company gives the Selling Common Holder notice that it desires to purchase such shares, then payment for the Offered Shares shall be made by check or wire transfer against delivery of the Offered Shares to be purchased at a time and
place agreed upon between the parties, which time shall be no later than forty-five (45) days after delivery to the Company of the Transfer Notice in accordance with Section 8.5, unless the Transfer Notice contemplated a later closing with
the prospective third-party transferee(s) or unless the value of the consideration to be paid for the Offered Shares has not yet been established pursuant to Section 7.3(e)(ii). If the Company fails to
purchase any or all of the Offered Shares by exercising the option granted in this Section 7.3(b) within the period provided, the remaining Offered Shares shall be subject to the options granted to the Lenders pursuant to Section 7.3(d).

 (c)    Additional Transfer Notice. Subject to the Company’s option set forth in Section 7.3(b), if
at any time the Selling Common Holder proposes a Transfer, then, within five (5) days after the Company has declined to purchase all, or a portion, of the Offered Shares or the Company’s option to so purchase the Offered Shares has
expired, the Selling Common Holder shall give each Lender an “Additional Transfer Notice” that shall include all of the information and certifications required in a Transfer Notice and shall additionally identify the Offered Shares
that the Company has declined to purchase (the “Remaining Shares”) and reference the Lenders’ rights of first refusal with respect to the proposed Transfer contained in this Agreement. 

(d)    Lenders’ Right of First Refusal. 

(i)    Each Lender shall have an option for a period of fifteen (15) days from the delivery of the Additional
Transfer Notice in accordance with Section 8.5 from the 

  
 23 

 
Selling Common Holder set forth in Section 7.3(c) to elect to purchase its respective pro rata share of the Remaining Shares at the same price and subject to the same material terms and
conditions as described in the Additional Transfer Notice. Each Lender may exercise such purchase option and purchase all or any portion of its pro rata share of the Remaining Shares (a “Participating Lender” for the purposes of
this Section 7.3(d) and Section 7.3(e)), by notifying the Selling Common Holder and the Company in writing, before expiration of the fifteen (15)-day period as to the number of such shares that it
wishes to purchase. Each Lender’s pro rata share of the Remaining Shares shall be a fraction of the Remaining Shares, the numerator of which shall be the number of shares of Common Stock either already issued or issuable, directly or
indirectly, upon conversion of the Notes owned by such Lender on the date of the Transfer Notice and denominator of which shall be the total number of shares of Common Stock either already issued or issuable, directly or indirectly, upon
conversion of the Notes held by all Lenders on the date of the Transfer Notice. 
 (ii)    In the event any Lender
elects not to purchase its pro rata share of the Remaining Shares available pursuant to its option under Section 7.3(d)(i) within the time period set forth therein, then the Selling Common Holder shall promptly give written notice (the
“Overallotment Notice”) to each Participating Lender that has elected to purchase all of its pro rata share of the Remaining Shares (each a “Fully Participating Lender”), which notice shall set forth the number of
Remaining Shares not purchased by the other Lenders (“Unsubscribed Shares”), and shall offer the Fully Participating Lenders the right to acquire the Unsubscribed Shares. Each Fully Participating Lender shall have five (5) days
after delivery of the Overallotment Notice in accordance with Section 8.5 to deliver a written notice to the Selling Common Holder (the “Participating Lenders Overallotment Notice”) of its election to purchase its pro rata
share of the Unsubscribed Shares on the same terms and conditions as set forth in the Additional Transfer Notice, which such Participating Lenders Overallotment Notice shall also indicate the maximum number of the Unsubscribed Shares that such Fully
Participating Lender will purchase in the event that any other Fully Participating Lender elects not to purchase its pro rata share of the Unsubscribed Shares. For the purposes of determining a Fully Participating Lender’s pro rata share of the
unsubscribed shares under this Section 7.3(d)(ii), the numerator shall be the same as that used in Section 7.3(d)(i) above and the denominator shall be the total number of shares of Common Stock (including shares of Common Stock issuable,
directly or indirectly, upon conversion of the Notes) owned by all Fully Participating Lenders on the date of the Transfer Notice. 

(iii)    Each Participating Lender shall be entitled to apportion Remaining Shares to be purchased among its partners and
Affiliates, provided that such Participating Lender notifies the Selling Common Holder of such allocation. 

(e)    Payment. 

(i)    The Participating Lenders shall effect the purchase of the Remaining Shares with payment by check or wire transfer
against delivery of the Remaining Shares to be purchased at a time and place agreed upon between the parties, which time shall be no later than sixty (60) days after delivery to the Company of the Transfer Notice in accordance with
Section 8.5, unless the Transfer Notice contemplated a later closing with the prospective 

  
 24 

 
third-party transferee(s) or unless the value of the consideration to be paid for the Offered Shares has not yet been established pursuant to Section 7.3(e)(ii). 

(ii)    Should the purchase price specified in the Transfer Notice or Additional Transfer Notice be payable in a form of
consideration other than cash or evidences of indebtedness, the Company (and the Participating Lenders) shall have the right to pay such purchase price in an amount of cash equal to the fair market value of such consideration. If the Selling Common
Holder and the Company (or the Participating Lenders) cannot agree on such fair market value within ten (10) days after delivery to the Company of the Transfer Notice (or the delivery of the Additional Transfer Notice to the Lenders), the
valuation shall be made by an appraiser of recognized standing selected by the Selling Common Holder and the Company (or a majority-in-interest of the Participating
Lenders) or, if they cannot agree on an appraiser within twenty (20) days after delivery to the Company of the Transfer Notice (or the delivery of the Additional Transfer Notice to the Lenders), each shall select an appraiser of recognized
standing and those appraisers shall designate a third appraiser of recognized standing, whose appraisal shall be determinative of such value. The cost of such appraisal shall be shared equally by the Selling Common Holder, on the one hand, and the
Company (and, to the extent there are any, the Participating Lenders, on the other hand, with that half of the cost to be borne by the Company and the Participating Lenders to be apportioned on a pro rata basis based on the number of shares each
such party has expressed an interest in purchasing pursuant to this Section 7.3). If the time for the closing of the Company’s purchase or the Participating Lenders’ purchase has expired but the determination of the value of the
purchase price offered by the prospective transferee(s) has not been finalized, then such closing shall be held on or prior to the fifth business day after such valuation shall have been made pursuant to this Section 7.3(e)(ii). 

(f)    Exempted Transfers. Notwithstanding the foregoing or anything to the contrary herein, the provisions of
this Section 7.3 shall not apply to a transfer of Equity Securities by a Common Holder, either during his or her lifetime or on death by will or intestacy, to his or her spouse, including any life partner or similar statutorily-recognized
domestic partner, child (natural or adopted), siblings, or any other direct lineal descendant of such Common Holder (or his or her spouse, including any life partner or similar statutorily-recognized domestic partner) (all of the foregoing
collectively referred to as “family members”), or any other person approved by the Board, or to a trust for the benefit of the Common Holder (or such individual) or any of his or her family members, or to a custodian or trustee of
any trust, partnership or limited liability company for the benefit of, or the ownership interests of which are owned wholly by such Common Holder or any such family members, or (where the Common Holder is a trust) to any beneficiary of the trust,
any family members of any such beneficiary or any other trust established for the benefit of any such beneficiary or family member thereof; provided that in each case the Common Holder shall deliver prior written notice to the Company of such
pledge, gift or transfer and such Equity Securities shall at all times remain subject to the terms and restrictions set forth in this Agreement and such transferee shall, as a condition to such Transfer, deliver a counterpart signature page to this
Agreement as confirmation that such transferee shall be bound by all the terms and conditions of this Agreement as a Common Holder (but only with respect to the 

  
 25 

 
securities so transferred to the transferee), including the obligations of a Common Holder with respect to Transfers of Equity Securities pursuant to this Section 7.3. 

(g)    Termination. The covenants set forth in this Section 7.3 shall terminate and be of no further force or
effect upon (i) the consummation of the Initial Public Offering, (ii) when the Company first becomes subject to the periodic reporting requirements of Sections 12(g) or 15(d) of the Exchange Act and (iii) upon the consummation of a
Corporate Transaction, whichever event shall first occur. 
 7.4    Drag Along Right. 

(a)    Actions to be Taken. In the event that the Board, the holders of a majority of the outstanding shares of
Common Stock, including the affirmative approval of Frazier, and the Requisite Noteholders (the “Requisite Parties”), approve a Corporate Transaction, then each Common Holder, Takeda and Frazier hereby agrees with respect to all
Shares which it own(s) or over which it otherwise exercises voting or dispositive authority: 
 (i)    in the event
such transaction is to be brought to a vote at a stockholder meeting, after receiving proper notice of any meeting of stockholders of the Company, to vote on the approval of a Corporate Transaction, to be present, in person or by proxy, as a holder
of shares of voting securities, at all such meetings and be counted for the purposes of determining the presence of a quorum at such meetings; 

(ii)    to vote (in person, by proxy or by action by written consent, as applicable) all Shares in favor of such
Corporate Transaction and in opposition to any and all other proposals that could reasonably be expected to delay or impair the ability of the Company to consummate such Corporate Transaction; 

(iii)    to refrain from exercising any dissenters’ rights or rights of appraisal under applicable law at any time
with respect to such Corporate Transaction; 
 (iv)    to execute and deliver all related documentation and take such
other action in support of the Corporate Transaction as shall reasonably be requested by the Company or the Requisite Parties; 

(v)    if the Corporate Transaction is structured as a Stock Sale, to sell the same proportion of his, her or its Shares
as is being sold by the Requisite Parties, and, except as permitted in Section 7.4(b) below, on the same terms and conditions as the Requisite Parties; 

(vi)    not to deposit, and to cause their affiliates not to deposit, except as provided in this Agreement, any Shares
owned by such Common Holder, Takeda and Frazier or any of their Affiliates in a voting trust or subject any such Shares to any arrangement or agreement with respect to the voting of such Shares, unless specifically requested to do so by the acquirer
in connection with the Corporate Transaction; and 

  
 26 

 (vii)    if the consideration to be paid in exchange for the Shares
pursuant to this Section 7.4 includes any securities and due receipt thereof by any stockholder would require under applicable law (i) the registration or qualification of such securities or of any person as a broker or dealer or agent
with respect to such securities or (ii) the provision to any Common Holder, Takeda and Frazier of any information other than such information as a prudent issuer would generally furnish in an offering made solely to “accredited
investors” as defined in Regulation D promulgated under the Securities Act, the Company may cause to be paid to any such Common Holder, Takeda and Frazier in lieu thereof, against surrender of the Shares which would have otherwise been sold by
such stockholder, an amount in cash equal to the fair value (as determined in good faith by the Company) of the securities which such Common Holder, Takeda and Frazier would otherwise receive as of the date of the issuance of such securities in
exchange for the Shares. 
 (b)    Exceptions. Notwithstanding the foregoing, each Common Holder, Takeda,
Frazier and any holder of Common Stock issued upon the conversion of the Notes in accordance with the provisions of this Agreement will not be required to comply with Section 7.4(a) above in connection with any proposed Corporate Transaction
(the “Proposed Sale”) unless: 
 (i)    any representations and warranties to be made by such Common
Holder, Takeda and Frazier in connection with the Proposed Sale are limited to representations and warranties related to authority, ownership and the ability to convey title to such Common Holder’s, Takeda’s and Frazier’s Shares,
including, without limitation, representations and warranties that (i) the Common Holder, Takeda and Frazier holds all right, title and interest in and to the Shares such stockholder purports to hold, free and clear of all liens and
encumbrances, (ii) the obligations of the Common Holder, Takeda and Frazier in connection with the transaction have been duly authorized, if applicable, (iii) the documents to be entered into by the stockholder have been duly executed by
the Common Holder, Takeda and Frazier and delivered to the acquiror and are enforceable against the stockholder in accordance with their respective terms and (iv) neither the execution and delivery of documents to be entered into in connection
with the transaction, nor the performance of the Common Holder’s, Takeda’s and Frazier’s obligations thereunder, will cause a breach or violation of the terms of any agreement, law or judgment, order or decree of any court or
governmental agency by which such stockholder is subject or bound; 
 (ii)    the Common Holder, Takeda and Frazier
shall not be liable for the inaccuracy of any representation or warranty made by any other person in connection with the Proposed Sale, other than the Company (except to the extent that funds may be paid out of an escrow established to cover breach
of representations, warranties and covenants of the Company as well as breach by any stockholder of any identical representations, warranties and covenants provided by all stockholders); 

(iii)    the liability for indemnification, if any, of such Common Holder, Takeda and Frazier in the Proposed Sale and
for the inaccuracy of any representations and warranties made by the Company in connection with such Proposed Sale, is several and not joint with any other person (except to the extent that funds may be paid out of an escrow established to cover
breach of representations, warranties and covenants of the Company as well as breach by any stockholder of any identical representations, warranties and covenants provided by all 

  
 27 

 
stockholders), and is pro rata in proportion to the amount of consideration paid to such Common Holder, Takeda and Frazier in connection with such Proposed Sale (in accordance with the provisions
of the Certificate of Incorporation); 
 (iv)    liability shall be limited to such Common Holder’s, Takeda’s
and Frazier’s applicable share (determined based on the respective proceeds payable to each stockholder in connection with such Proposed Sale in accordance with the provisions of the Certificate of Incorporation) of a negotiated aggregate
indemnification amount that applies equally to all Common Holder, Takeda and Frazier but that in no event exceeds the amount of consideration otherwise payable to such Common Holder, Takeda and Frazier in connection with such Proposed Sale, except
with respect to claims related to fraud by such Common Holder, Takeda and Frazier, the liability for which need not be limited as to such Common Holder, Takeda and Frazier; 

(v)    upon the consummation of the Proposed Sale, (A) each holder of each class or series of the Company’s
stock will receive the same form of consideration for their shares of such class or series as is received by other holders in respect of their shares of such same class or series of stock, (B) each holder of a series of Preferred Stock will
receive the same amount of consideration per share of such series of Preferred Stock as is received by other holders in respect of their shares of such same series, (C) each holder of Common Stock will receive the same amount of consideration
per share of Common Stock as is received by other holders in respect of their shares of Common Stock, and (D) the aggregate consideration receivable by all holders of the Preferred Stock and Common Stock shall be allocated among the holders of
Preferred Stock and Common Stock on the basis of the relative liquidation preferences to which the holders of each respective series of Preferred Stock and the holders of Common Stock are entitled in a Corporate Transaction (assuming for this
purpose that the Proposed Sale is a Corporate Transaction) in accordance with the Certificate of Incorporation in effect immediately prior to the Proposed Sale; 

(vi)    subject to subsection 7.4(b)(v) above, requiring the same form of consideration to be available to the holders of
any single class or series of capital stock, if any holders of a series or class of capital stock of the Company are given an option as to the form and amount of consideration to be received as a result of the Proposed Sale, all holders of such
series or class of capital stock will be given the same option; provided, however, that nothing in this subsection 7.4(b)(vi) shall entitle any holder to receive any form of consideration that such holder would be ineligible to receive
as a result of such holder’s failure to satisfy any condition, requirement or limitation that is generally applicable to the Company’s stockholders; 

(vii)    no Common Holder that previously was a Lender shall be required to agree to any covenant not to compete or
covenant not to solicit customers, employees or suppliers of any party to the Proposed Sale, or any obligation to provide services to the Company, the Person or group of related Persons participating in the Proposed Sale, or any other Person; 

(viii)    such Common Holder (unless such Common Holder is a Company officer or employee), Takeda and Frazier are not
required to agree to any restrictive covenant in connection with the Proposed Sale (including without limitation any covenant not to 

  
 28 

 
compete or covenant not to solicit customers, employees or suppliers of any party to the Proposed Sale); and 

(ix)    such Common Holder, Takeda and Frazier and their Affiliates are not required to amend, extend or terminate any
contractual or other relationship with the Company, the acquirer or their respective Affiliates, except that such Common Holder, Takeda and Frazier may be required to agree to terminate the investment-related documents between or among such Common
Holder, Takeda or Frazier, the Company and/or other stockholders of the Company. 
 (c)    Termination. This
Section 7.4 shall be effective as of the date of this Agreement and shall continue in effect until and shall terminate upon the earliest to occur of (i) the consummation of the Initial Public Offering, (ii) when the Company first
becomes subject to the periodic reporting requirements of Sections 12(g) or 15(d) of the Exchange Act and (iii) upon the consummation of a Corporate Transaction; provided that the provisions of Section 7.4 hereof will continue after
the closing of any Corporate Transaction to the extent necessary to enforce the provisions of Section 7.4 with respect to such Corporate Transaction. 

7.5    Registration Rights. The Company covenants and agrees as follows: 

(a)    Request for Registration. 

(i)    Subject to the conditions of this Section 7.5(a), if the Company shall receive at any time following the
earlier of (A) five (5) years after the date of this Agreement or (B) one hundred eighty (180) days after the Initial Public Offering, a written request from the Holders of at least twenty-five percent (25%) of the holders of
Registrable Securities then outstanding (for purposes of this Section 7.5(a), the “Initiating Holders”) that the Company file a registration statement under the Securities Act covering the registration of Registrable Securities
with an anticipated aggregate offering price of at least $10,000,000, then the Company shall, within twenty (20) days of the receipt thereof, give written notice of such request to all Lenders, and subject to the limitations of this
Section 7.5(a), use its commercially reasonable efforts to effect, as soon as practicable, the registration under the Securities Act of all Registrable Securities that the Holders request to be registered in a written request received by the
Company within twenty (20) days of the mailing of the Company’s notice pursuant to this Section 7.5(a)(i). 

(ii)    If the Initiating Holders intend to distribute the Registrable Securities covered by their request by means of an
underwriting, they shall so advise the Company as a part of their request made pursuant to this Section 7.5(a), and the Company shall include such information in the written notice referred to in Section 7.5(a)(i). In such event the right
of any Holder to include its Registrable Securities in such registration shall be conditioned upon such Holder’s participation in such underwriting and the inclusion of such Holder’s Registrable Securities in the underwriting (unless
otherwise mutually agreed by a majority in interest of the Initiating Holders and such Holder) to the extent provided herein. All Holders proposing to distribute their securities through such underwriting shall enter into an underwriting agreement
in customary form with the underwriter or underwriters selected for such underwriting by the Company (which underwriter or underwriters shall be reasonably acceptable to those Initiating Holders holding a majority of the Registrable Securities then
held by all Initiating Holders). 

  
 29 

 
Notwithstanding any other provision of this Section 7.5(a), if the underwriter advises the Company that marketing factors require a limitation on the number of securities underwritten
(including Registrable Securities), then the Company shall so advise all Holders of Registrable Securities that would otherwise be underwritten pursuant hereto, and the number of shares that may be included in the underwriting shall be allocated to
the Holders of such Registrable Securities pro rata based on the number of Registrable Securities held by all such Holders (including the Initiating Holders). In no event shall any Registrable Securities be excluded from such underwriting unless all
other securities are first excluded. Any Registrable Securities excluded or withdrawn from such underwriting shall be withdrawn from the registration. 

(iii)    Notwithstanding the foregoing, the Company shall not be required to effect a registration pursuant to this
Section 7.5(a): 
 (A)    in any particular jurisdiction in which the Company would be required to execute a
general consent to service of process in effecting such registration, unless the Company is already subject to service in such jurisdiction and except as may be required under the Securities Act; 

(B)    after the Company, within the twelve (12) month period preceding the date of such request, has effected
two (2) registrations pursuant to this Section 7.5(a), and such registrations have been declared or ordered effective; 

(C)    during the period starting with the date sixty (60) days prior to the Company’s good faith estimate of
the date of the filing of and ending on a date one hundred eighty (180) days following the effective date of a Company-initiated registration subject to Section 7.5(b) below, provided that the Company is actively employing in good
faith its commercially reasonable efforts to cause such registration statement to become effective and the Company gives notice to the Initiating Holders of such efforts; 

(D)    if the Initiating Holders propose to dispose of Registrable Securities that may be registered on Form S-3 pursuant to Section 7.5(c) hereof; or 
 (E)    if the Company
shall furnish to Holders requesting a registration statement pursuant to this Section 7.5(a) a certificate signed by the Company’s Chief Executive Officer or Chairman of the Board stating that in the good faith judgment of the Board, it
would be seriously detrimental to the Company and its stockholders for such registration statement to be effected at such time, in which event the Company shall have the right to defer such filing for a period of not more than ninety (90) days
after receipt of the request of the Initiating Holders; provided that such right shall be exercised by the Company not more than once in any twelve (12) month period. 

(b)    Company Registration. 

(i)    If (but without any obligation to do so) the Company proposes to register (including for this purpose a
registration effected by the Company for stockholders other than the Holders) any of its stock or other securities under the Securities Act in connection with the public offering of such securities (other than a registration relating to a demand

  
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pursuant to Section 7.5(a) of this Agreement, a registration relating solely to the sale of securities of participants in a Company stock plan, a registration relating to a corporate
reorganization or transaction under Rule 145 of the Securities Act, a registration on any form that does not include substantially the same information as would be required to be included in a registration statement covering the sale of the
Registrable Securities, a registration in which the only Common Stock being registered is Common Stock issuable upon conversion of debt securities that are also being registered, or a registration relating to the Initial Public Offering), the
Company shall, at such time, promptly give each Holder written notice of such registration. Upon the written request of each Holder given within twenty (20) days after mailing of such notice by the Company in accordance with Section 8.5 of
this Agreement, the Company shall, subject to the provisions of Section 7.5(b)(iii) of this Agreement, use its commercially reasonable efforts to cause to be registered under the Securities Act all of the Registrable Securities that each such
Holder requests to be registered. 
 (ii)    Right to Terminate Registration. The Company shall have the right
to terminate or withdraw any registration initiated by it under this Section 7.5(b) prior to the effectiveness of such registration whether or not any Holder has elected to include securities in such registration. The expenses of such withdrawn
registration shall be borne by the Company in accordance with Section 7.5(f) hereof. 
 (iii)    Underwriting
Requirements. In connection with any offering involving an underwriting of shares of the Company’s capital stock, the Company shall not be required under this Section 7.5(b) to include any of the Holders’ securities in such
underwriting unless they accept the terms of the underwriting as agreed upon between the Company and the underwriters selected by the Company (or by other Persons entitled to select the underwriters) and enter into an underwriting agreement in
customary form with such underwriters, and then only in such quantity as the underwriters determine in their sole discretion will not jeopardize the success of the offering by the Company. If the total amount of securities, including Registrable
Securities, requested by stockholders to be included in such offering exceeds the amount of securities sold other than by the Company that the underwriters determine in their sole discretion is compatible with the success of the offering, then the
Company shall be required to include in the offering only that number of such securities, including Registrable Securities, that the underwriters determine in their sole discretion will not jeopardize the success of the offering. In the event that
the underwriters determine that less than all of the Registrable Securities requested to be registered can be included in such offering, then the Registrable Securities that are included in such offering shall be apportioned pro rata among the
selling Holders based on the number of Registrable Securities held by all selling Holders or in such other proportions as shall mutually be agreed to by all such selling Holders. Notwithstanding the foregoing, in no event shall (A) any
Registrable Securities be excluded from such offering unless all other stockholders’ securities have been first excluded from the offering and (B) the amount of securities of the selling Holders included in the offering be reduced below
twenty percent (20%) of the total amount of securities included in such offering, unless such offering is the Initial Public Offering, in which case the selling Holders may be excluded if the underwriters make the determination described above and
no other stockholder’s securities are included in such offering. For purposes of the preceding sentence concerning apportionment, for any selling stockholder that is a Holder of Registrable Securities and that is a venture capital fund,
partnership or corporation, the affiliated venture 

  
 31 

 
capital funds, partners, members, retired partners and stockholders of such Holder, or the estates and family members of any such partners, members and retired partners and any trusts for the
benefit of any of the foregoing Persons shall be deemed to be a single “selling Holder,” and any pro rata reduction with respect to such “selling Holder” shall be based upon the aggregate amount of Registrable Securities owned by
all such related entities and individuals. 
 (c)    Form S-3
Registration. In case the Company shall receive from the Holders of at least twenty percent (20%) of the Registrable Securities (for purposes of this Section 7.5(c), the “S-3 Initiating
Holders”) a written request or requests that the Company effect a registration on Form S-3 and any related qualification or compliance with respect to all or a part of the Registrable Securities
owned by such Holder or Holders, the Company shall: 
 (i)    promptly give written notice of the proposed
registration, and any related qualification or compliance, to all other Holders; and 
 (ii)    use its commercially
reasonable efforts to effect, as soon as practicable, such registration and all such qualifications and compliances as may be so requested and as would permit or facilitate the sale and distribution of all or such portion of such Holders’
Registrable Securities as are specified in such request, together with all or such portion of the Registrable Securities of any other Holders joining in such request as are specified in a written request given within fifteen (15) days after
receipt of such written notice from the Company; provided, however, that the Company shall not be obligated to effect any such registration, qualification or compliance, pursuant to this Section 7.5(c): 

(A)    if Form S-3 is not available for such offering by the Holders; 

(B)    if the Holders, together with the holders of any other securities of the Company entitled to inclusion in such
registration, propose to sell Registrable Securities and such other securities (if any) at an aggregate price to the public (net of any underwriters’ discounts or commissions) of less than $3,000,000; 

(C)    if the Company shall furnish to all Holders requesting a registration statement pursuant to this
Section 7.5(c) a certificate signed by the Company’s Chief Executive Officer or Chairman of the Board stating that in the good faith judgment of the Board, it would be seriously detrimental to the Company and its stockholders for such
registration statement to be effected at such time, in which event the Company shall have the right to defer such filing for a period of not more than ninety (90) days after receipt of the request of the
S-3 Initiating Holders; provided that such right shall be exercised by the Company not more than once in any twelve (12) month period; 

(D)    if the Company has, within the twelve (12) month period preceding the date of such request, already effected
two (2) registrations on Form S-3 pursuant to this Section 7.5(c); 

  
 32 

 (E)    in any particular jurisdiction in which the Company would be
required to qualify to do business or to execute a general consent to service of process in effecting such registration, qualification or compliance; 

(F)    if the Company, within thirty (30) days of receipt of the request of such
S-3 Initiating Holders, gives notice of its bona fide intention to effect the filing of a registration statement with the SEC within one hundred twenty (120) days of receipt of such request (other than a
registration effected solely to qualify an employee benefit plan or to effect a business combination pursuant to Rule 145), provided that the Company is actively employing in good faith its commercially reasonable efforts to cause such
registration statement to become effective; or 
 (G)    during the period starting with the date thirty (30) days
prior to the Company’s good faith estimate of the date of the filing of and ending on a date ninety (90) days following the effective date of a Company-initiated registration subject to Section 7.5(b) of this Agreement,
provided that the Company is actively employing in good faith its commercially reasonable efforts to cause such registration statement to become effective and the Company gives notice to the Initiating Holders of such efforts. 

(iii)    If the S-3 Initiating Holders intend to distribute the Registrable
Securities covered by their request by means of an underwriting, they shall so advise the Company as a part of their request made pursuant to this Section 7.5(c) and the Company shall include such information in the written notice referred to
in Section 7.5(c)(i). The provisions of Section 7.5(a)(ii) of this Agreement shall be applicable to such request (with the substitution of Section 7.5(c) for references to Section 7.5(a)). 

(iv)    Subject to the foregoing, the Company shall file a registration statement covering the Registrable Securities and
other securities so requested to be registered as soon as practicable after receipt of the request or requests of the S-3 Initiating Holders. Registrations effected pursuant to this Section 7.5(c) shall
not be counted as requests for registration effected pursuant to Section 7.5(a) of this Agreement. 

(d)    Obligations of the Company. Whenever required under this Section 7.5 to effect the registration of any
Registrable Securities, the Company shall, as expeditiously as reasonably possible: 
 (i)    prepare and file with the
SEC a registration statement with respect to such Registrable Securities and use its commercially reasonable efforts to cause such registration statement to become effective, and, upon the request of the Holders of a majority of the Registrable
Securities registered thereunder, keep such registration statement effective for a period of up to one hundred twenty (120) days or, if earlier, until the distribution contemplated in the Registration Statement has been completed; 

(ii)    prepare and file with the SEC such amendments and supplements to such registration statement and the prospectus
used in connection with such registration statement as may be necessary to comply with the provisions of the Securities Act with respect to the disposition of all securities covered by such registration statement; 

  
 33 

 (iii)    furnish to the Holders such number of copies of a prospectus,
including a preliminary prospectus and any Free Writing Prospectus, in conformity with the requirements of the Securities Act, and such other documents as they may reasonably request in order to facilitate the disposition of Registrable Securities
owned by them; 
 (iv)    use its commercially reasonable efforts to register and qualify the securities covered by
such registration statement under such other securities or Blue Sky laws of such jurisdictions as shall be reasonably requested by the Holders, provided that the Company shall not be required in connection therewith or as a condition thereto
to qualify to do business or to file a general consent to service of process in any such states or jurisdictions; 

(v)    in the event of any underwritten public offering, enter into and perform its obligations under an underwriting
agreement, in usual and customary form, with the managing underwriter of such offering; 
 (vi)    notify each Holder
of Registrable Securities covered by such registration statement at any time when a prospectus or Free Writing Prospectus (to the extent prepared by or on behalf of the Company) relating thereto is required to be delivered under the Securities Act
of the happening of any event as a result of which the prospectus included in such registration statement, as then in effect, includes an untrue statement of a material fact or omits to state a material fact required to be stated therein or
necessary to make the statements therein not misleading in the light of the circumstances then existing, and, at the request of any such Holder, the Company will, as soon as reasonably practicable, file and furnish to all such Holders a supplement
or amendment to such prospectus or Free Writing Prospectus (to the extent prepared by or on behalf of the Company) so that, as thereafter delivered to the purchasers of such Registrable Securities, such prospectus will not contain an untrue
statement of a material fact or omit to state any fact necessary to make the statements therein not misleading in light of the circumstances under which they were made; 

(vii)    cause all such Registrable Securities registered pursuant to this Section 7.5 to be listed on a national
exchange or trading system and on each securities exchange and trading system on which similar securities issued by the Company are then listed; and 

(viii)    provide a transfer agent and registrar for all Registrable Securities registered pursuant to this Agreement and
a CUSIP number for all such Registrable Securities, in each case not later than the effective date of such registration. 
 Notwithstanding
the provisions of this Section 7.5, the Company shall be entitled to postpone or suspend, for a reasonable period of time, the filing, effectiveness or use of, or trading under, any registration statement if the Company shall determine that any
such filing or the sale of any securities pursuant to such registration statement would in the good faith judgment of the Board: 

(A)    materially impede, delay or interfere with any material pending or proposed financing, acquisition, corporate
reorganization or other similar transaction involving the Company for which the Board has authorized negotiations; 

  
 34 

 (B)    materially and adversely impair the consummation of any pending
or proposed material offering or sale of any class of securities by the Company; or 
 (C)    require disclosure of
material nonpublic information that, if disclosed at such time, would be materially harmful to the interests of the Company and its stockholders; provided, however, that during any such period all executive officers and directors of
the Company are also prohibited from selling securities of the Company (or any security of any of the Company’s subsidiaries or affiliates). 

In the event of the suspension of effectiveness of any registration statement pursuant to this Section 7.5(d), the applicable time period
during which such registration statement is to remain effective shall be extended by that number of days equal to the number of days the effectiveness of such registration statement was suspended. 

(e)    Information from Holder. It shall be a condition precedent to the obligations of the Company to take any
action pursuant to this Section 7.5 with respect to the Registrable Securities of any selling Holder that such Holder shall furnish to the Company such information regarding itself, the Registrable Securities held by it, and the intended method
of disposition of such securities as shall be reasonably required to effect the registration of such Holder’s Registrable Securities. 

(f)    Expenses of Registration. All expenses other than underwriting discounts and commissions incurred in
connection with registrations, filings or qualifications pursuant to Sections 7.5(a) and 7.5(b) of this Agreement, including, without limitation, all registration, filing and qualification fees, printers’ and accounting fees, fees and
disbursements of counsel for the Company and the reasonable fees and disbursements, not to exceed $50,000, of one counsel for the selling Holders selected by the Holders of a majority of the Registrable Securities to be registered shall be borne by
the Company. Notwithstanding the foregoing, the Company shall not be required to pay for any expenses of any registration proceeding begun pursuant to Section 7.5(a) of this Agreement if the registration request is subsequently withdrawn at the
request of the Holders of a majority of the Registrable Securities to be registered (in which case all participating Holders shall bear such expenses pro rata based upon the number of Registrable Securities that were to be included in the withdrawn
registration) unless, in the case of a registration requested under Section 7.5(a) of this Agreement, the Holders of a majority of the Registrable Securities agree to forfeit their right to one demand registration pursuant to
Section 7.5(a) of this Agreement; provided, however, that if at the time of such withdrawal, the Holders have learned of a material adverse change in the condition, business or prospects of the Company from that known to the
Holders at the time of their request and have withdrawn the request with reasonable promptness following disclosure by the Company of such material adverse change, then the Holders shall not be required to pay any of such expenses and shall retain
their rights pursuant to Section 7.5(a) of this Agreement. All expenses incurred in connection with a registration requested pursuant to Section 7.5(c) of this Agreement, including, without limitation, all registration, filing,
qualification, printer’s and accounting fees and the reasonable fees and disbursements of counsel for the Company, shall be borne by the Company. 

(g)    Delay of Registration. No Holder shall have any right to obtain or seek an injunction restraining or
otherwise delaying any such registration as the result of any 

  
 35 

 
controversy that might arise with respect to the interpretation or implementation of this Section 7.5. 

(h)    Indemnification. In the event any Registrable Securities are included in a registration statement under
this Section 7.5: 
 (i)    To the extent permitted by law, the Company will indemnify and hold harmless each
Holder, the partners, members, officers, directors and stockholders of each Holder, legal counsel and accountants for each Holder, any underwriter (as defined in the Securities Act) for such Holder and each Person, if any, who controls such Holder
or underwriter within the meaning of the Securities Act or the Exchange Act, against any losses, claims, damages or liabilities (joint or several) to which they may become subject under the Securities Act, the Exchange Act, any state securities laws
or any rule or regulation promulgated under the Securities Act, the Exchange Act or any state securities laws, insofar as such losses, claims, damages, or liabilities (or actions or proceedings, whether commenced or threatened, in respect thereof)
arise out of or are based upon any of the following statements, omissions or violations (collectively, a “Violation”): (i) any untrue or alleged untrue statement of a material fact contained in such registration statement,
including any preliminary prospectus, final prospectus, or Free Writing Prospectus contained therein or any amendments or supplements thereto, any issuer information (as defined in Rule 433 of the Securities Act) filed or required to be filed
pursuant to Rule 433(d) under the Securities Act or any other document incident to such registration prepared by or on behalf of the Company or used or referred to by the Company, (ii) the omission or alleged omission of a material fact
required to be stated in such registration statement, or necessary to make the statements therein not misleading or (iii) any violation or alleged violation by the Company of the Securities Act, the Exchange Act, any state securities laws or
any rule or regulation promulgated under the Securities Act, the Exchange Act or any state securities laws, and the Company will reimburse each such Holder, underwriter, controlling Person or other aforementioned Person for any legal or other
expenses reasonably incurred by them in connection with investigating or defending any such loss, claim, damage, liability, action or proceeding as such expenses are incurred; provided, however, that the indemnity agreement contained
in this Section 7.5(h)(i) shall not apply to amounts paid in settlement of any such loss, claim, damage, liability, action or proceeding if such settlement is effected without the consent of the Company (which consent shall not be unreasonably
withheld), nor shall the Company be liable in any such case for any such loss, claim, damage, liability, action or proceeding to the extent that it arises out of or is based upon a Violation that occurs in reliance upon, and in conformity with,
written information furnished expressly for use in connection with such registration by any such Holder, underwriter, controlling Person or other aforementioned Person. 

(ii)    To the extent permitted by law, each selling Holder, severally and not jointly, will indemnify and hold harmless
the Company, each of its directors, each of its officers who has signed the registration statement, each Person, if any, who controls the Company within the meaning of the Securities Act, legal counsel and accountants for the Company, any
underwriter, any other Holder selling securities in such registration statement and any controlling Person of any such underwriter or other Holder, against any losses, claims, damages or liabilities (joint or several) to which any of the foregoing
Persons may become subject, under the Securities Act, the Exchange Act, any state securities laws or any rule or regulation 

  
 36 

 
promulgated under the Securities Act, the Exchange Act or any state securities laws, insofar as such losses, claims, damages or liabilities (or actions or proceedings, whether commenced or
threatened, in respect thereof) arise out of or are based upon any Violation, in each case to the extent (and only to the extent) that such Violation occurs in reliance upon and in conformity with written information furnished by such Holder
expressly for use in connection with such registration; and each such Holder will reimburse any Person intended to be indemnified pursuant to this Section 7.5(h)(ii) for any legal or other expenses reasonably incurred by such Person in
connection with investigating or defending any such loss, claim, damage, liability, action or proceeding as such expenses are incurred; provided, however, that the indemnity agreement contained in this Section 7.5(h)(ii) shall not
apply to amounts paid in settlement of any such loss, claim, damage, liability, action or proceeding if such settlement is effected without the consent of the Holder (which consent shall not be unreasonably withheld), and provided that in no
event shall any indemnity under this Section 7.5(h)(ii) exceed the gross proceeds from the offering received by such Holder. 

(iii)    Promptly after receipt by an indemnified party under this Section 7.5(h) of notice of the commencement of
any action or proceeding (including any governmental action or proceeding) for which a party may be entitled to indemnification, such indemnified party will, if a claim in respect thereof is to be made against any indemnifying party under this
Section 7.5(h), deliver to the indemnifying party a written notice of the commencement thereof and the indemnifying party shall have the right to participate in and, to the extent the indemnifying party so desires, jointly with any other
indemnifying party similarly noticed, to assume the defense thereof with counsel mutually satisfactory to the parties; provided, however, that an indemnified party (together with all other indemnified parties that may be represented
without conflict by one counsel) shall have the right to retain one (1) separate counsel, with the fees and expenses to be paid by the indemnifying party, if representation of such indemnified party by the counsel retained by the indemnifying
party would be inappropriate due to actual or potential differing interests between such indemnified party and any other party represented by such counsel in such proceeding. The failure to deliver written notice to the indemnifying party within a
reasonable time of the commencement of any such action or proceeding, if prejudicial to its ability to defend such action or proceeding, shall relieve such indemnifying party of any liability to the indemnified party under this Section 7.5(h)
to the extent of such prejudice, but the omission to so deliver written notice to the indemnifying party will not relieve such indemnifying party of any liability that it may have to any indemnified party otherwise than under this
Section 7.5(h). 
 (iv)    If the indemnification provided for in this Section 7.5(h) is held by a court of
competent jurisdiction to be unavailable to an indemnified party with respect to any loss, liability, claim, damage or expense referred to herein, then the indemnifying party, in lieu of indemnifying such indemnified party hereunder, shall
contribute to the amount paid or payable by such indemnified party as a result of such loss, liability, claim, damage or expense in such proportion as is appropriate to reflect the relative fault of the indemnifying party on the one hand and the
indemnified party on the other hand in connection with the statements or omissions that resulted in such loss, liability, claim, damage or expense, as well as any other relevant equitable considerations; provided, however, that
(A) no contribution by any Holder, when combined with any amounts paid by such Holder pursuant to Section 7.5(h)(ii), shall exceed the gross proceeds from the offering received by such Holder and (B) no Person guilty of fraudulent
misrepresentation 

  
 37 

 
(within the meaning of Section 11(f) of the Securities Act) will be entitled to contribution from any Person who was not guilty of such fraudulent misrepresentation; and provided
further that in no event shall a Holder’s liability pursuant to this Section 7.5(h)(iv), when combined with the amounts paid or payable by such Holder pursuant to Section 7.5(h)(ii), exceed the proceeds from the offering
received by such Holder (net of any expenses paid by such Holder). The relative fault of the indemnifying party and the indemnified party shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a
material fact or the omission or alleged omission to state a material fact relates to information supplied by the indemnifying party or by the indemnified party and the parties’ relative intent, knowledge, access to information and opportunity
to correct or prevent such statement or omission. 
 (v)    Notwithstanding the foregoing, to the extent that the
provisions on indemnification and contribution contained in the underwriting agreement entered into in connection with the underwritten public offering are in conflict with the foregoing provisions, the provisions in the underwriting agreement shall
control. 
 (vi)    The obligations of the Company and Holders under this Section 7.5(h)(ii) shall survive the
completion of any offering of Registrable Securities in a registration statement under this Section 7.5 and otherwise. 

(i)    Reports Under the Exchange Act. With a view to making available to the Holders the benefits of
Rule 144 and any other rule or regulation of the SEC that may at any time permit a Holder to sell securities of the Company to the public without registration or pursuant to a registration on Form S-3,
the Company agrees to: 
 (i)    make and keep public information available, as those terms are understood and defined
in Rule 144, at all times after the effective date of the Initial Public Offering; 
 (ii)    file with the SEC in
a timely manner all reports and other documents required of the Company under the Securities Act and the Exchange Act; and 

(iii)    furnish to any Holder, so long as the Holder owns any Registrable Securities, forthwith upon request (A) a
written statement by the Company that it has complied with the reporting requirements of Rule 144 (at any time after ninety (90) days after the effective date of the first registration statement filed by the Company), the Securities Act
and the Exchange Act (at any time after it has become subject to such reporting requirements), or that it qualifies as a registrant whose securities may be resold pursuant to Form S-3 (at any time after
it so qualifies), (B) a copy of the most recent annual or quarterly report of the Company and such other reports and documents so filed by the Company and (C) such other information as may be reasonably requested to avail any Holder of any
rule or regulation of the SEC that permits the selling of any such securities without registration or pursuant to such form. 

(j)    Assignment of Registration Rights. The rights to cause the Company to register Registrable Securities
pursuant to this Section 7.5 may be assigned (but only with all related obligations) by a Holder to a transferee or assignee of such securities that (i) is an Affiliate, subsidiary, parent, partner, limited partner, retired partner, member
or stockholder of a 

  
 38 

 
Holder or (ii) is a Holder’s family member or trust for the benefit of an individual Holder; provided: (A) the Company is, within a reasonable time after such transfer,
furnished with written notice of the name and address of such transferee or assignee and the securities with respect to which such registration rights are being assigned; (B) such transferee or assignee agrees in writing to be bound by and
subject to the terms and conditions of this Agreement, including, without limitation, the provisions of Section 8.11 of this Agreement; and (C) such assignment shall be effective only if immediately following such transfer the further
disposition of such securities by the transferee or assignee is restricted under the Securities Act. 

(k)    Limitations on Subsequent Registration Rights. From and after the date of this Agreement, the Company shall
not, without the prior written consent of the Requisite Noteholders, enter into any agreement with any holder or prospective holder of any securities of the Company that would allow such holder or prospective holder (i) to include any of such
securities in any registration filed under Section 7.5(a), Section 7.5(b) or Section 7.5(c) of this Agreement, unless under the terms of such agreement, such holder or prospective holder may include such securities in any such
registration only to the extent that the inclusion of such securities will not reduce the amount of the Registrable Securities of the Holders that are included or (ii) to demand registration of their securities. 

(l)    Termination of Registration Rights. The right of any Holder to request registration or inclusion of
Registrable Securities in any registration pursuant to this Section 7.5, or exercise any other right provided for in this Section 7.5, shall terminate upon the earlier of (i) the consummation of a Corporate Transaction, (ii) such
time after the Initial Public Offering at which such Holder can sell all shares held by it in compliance with Rule 144(b)(1)(i) or another similar exemption under the Securities Act that is available for the sale of Holder’s shares without
limitation, during a three (3)-month period without registration, and (iii) the fifth (5th) anniversary of the Initial Public Offering. 

7.6    Voting Provisions Regarding the Board Provisions. 

(a)    Each Common Holder, Takeda and Frazier agrees to vote, or cause to be voted, all Shares owned by such Common
Holder, Takeda and Frazier, or over which such Common Holder, Takeda and Frazier has voting control, from time to time and at all times, in whatever manner as shall be necessary to ensure that the size of the Board shall be set and remain at ten
(10) directors. One of the ten director seats will be vacant as of the Closing. 
 (b)    Each Common Holder,
Takeda and Frazier agrees to vote, or cause to be voted, all Shares owned by such Common Holder, Takeda and Frazier, or over which such stockholder has voting control, from time to time and at all times, in whatever manner as shall be necessary to
ensure that at each annual or special meeting of stockholders at which an election of directors is held or pursuant to any written consent of the stockholders, the following persons shall be elected to the Board: 

(i)    One (1) individual designated from time to time by Frazier, who shall initially be Patrick Heron; 

  
 39 

 (ii)    One (1) individual designated from time to time by
Lightspeed Venture Partners Select IV, L.P. (together with its Affiliates, “LSVP”), who shall initially be Shelley Chu, M.D., Ph.D.; 

(iii)    One (1) individual designated from time to time by Deerfield Private Design Fund V, L.P. (together with its
Affiliates, “Deerfield”), who shall initially be Elise Wang; 
 (iv)    One (1) individual
designated from time to time by Takeda or its affiliates, which individual shall initially be Rajeev Venkayya; provided, however, that if such seat is vacant, Takeda or its affiliates shall not have the right to designate a member to
the Board to fill such vacant seat pursuant to this Section 7.6(b)(iv) at any time that the Board consists of fewer than five (5) individuals that are not affiliated with Takeda; 

(v)    One (1) individual designated from time to time by the holders of a majority of the Common Stock, which seat
shall initially be vacant; 
 (vi)    The Company’s Chief Executive Officer, who shall initially be Robert
Hershberg (the “CEO Director”), who shall initially be the Chairman of the Board, provided that if for any reason the CEO Director shall cease to serve as the Chief Executive Officer of the Company, each of the Common
Holders, Frazier and Takeda shall promptly vote their respective Shares (A) to remove the former Chief Executive Officer of the Company from the Board if such person has not resigned as a member of the Board; and (B) to elect such
person’s replacement as Chief Executive Officer of the Company as the new CEO Director; and 
 (vii)    Four
(4) individuals not otherwise an Affiliate of the Company or of any Lender who is mutually acceptable to the other members of the Board. 

(c)    In the absence of any designation from the Persons or groups with the right to designate a director as specified
above, the director previously designated by them and then serving shall be reelected if still eligible and willing to serve as provided herein and otherwise, such Board seat shall remain vacant. 

(d)    Each Common Holder, Takeda and Frazier also agrees to vote, or cause to be voted, all Shares owned by such Common
Holder, Takeda and Frazier, or over which such Common Holder, Takeda and Frazier has voting control, from time to time and at all times, in whatever manner as shall be necessary to ensure that: 

(i)    no director elected pursuant to Sections 7.6(b) or 7.6(c) of this Agreement may be removed from office other than
for cause unless (A) such removal is directed or approved by the Person(s) originally entitled to designate or approve such director pursuant to Section 7.6(b); or (B) the Person(s) originally entitled to designate or approve such
director pursuant to Section 7.6(b) is no longer so entitled to designate or approve such director; 
 (ii)    any
vacancies created by the resignation, removal or death of a director elected pursuant to Sections 7.6(b) or 7.6(c) shall be filled pursuant to the provisions of this Section 7.6; and 

  
 40 

 (iii)    upon the request of any party entitled to designate a director
as provided in Section 7.6(b) to remove such director, such director shall be removed. 
 All Common Holders, Takeda and Frazier agree to execute any
written consents required to perform the obligations of this Section 7.6, and the Company agrees at the request of any Person or group entitled to designate directors to call a special meeting of stockholders for the purpose of electing
directors. 
 (e)    No Common Holder, nor any Affiliate of any Common Holder, nor Takeda, Frazier nor any Lender shall
have any liability as a result of designating a person for election as a director for any act or omission by such designated person in his or her capacity as a director of the Company, nor shall any Common Holder, Takeda, Frazier nor any Lender have
any liability as a result of voting for any such designee in accordance with the provisions of this Section 7.6. 

(f)    The Company agrees to use its best efforts, within the requirements of applicable law, to ensure that the rights
granted under this Section 7.6 are effective and that the parties enjoy the benefits of this Section 7.6. Such actions include, without limitation, the use of the Company’s best efforts to cause the nomination and election of the
directors as provided in this Section 7.6. 
 (g)    Each party acknowledges and agrees that each party hereto
will be irreparably damaged in the event any of the provisions of this Section 7.6 are not performed by the parties in accordance with their specific terms or are otherwise breached. Accordingly, it is agreed that each of the Company, the
Common Holders, Takeda, Frazier and the Lenders shall be entitled to an injunction to prevent breaches of this Section 7.6, and to specific enforcement of this Section 7.6 and its terms and provisions in any action instituted in any court
of the United States or any state having subject matter jurisdiction. 
 (h)    All remedies, either under this
Section 7.6 or by law or otherwise afforded to any party, shall be cumulative and not alternative. 
 (i)    This
Section 7.6 shall be effective as of the date hereof and shall continue in effect until and shall terminate upon the earliest to occur of (a) the consummation of the Initial Public Offering (other than a registration statement relating
either to the sale of securities to employees of the Company pursuant to its stock option, stock purchase or similar plan or an SEC Rule 145 transaction) and (b) the consummation of any other Corporate Transaction. 

(j)    In the event that after the date of this Agreement, the Company enters into an agreement with any Person to issue
shares of capital stock to such Person, then, the Company shall cause such Person, as a condition precedent to entering into such agreement, to become a party to this Agreement by executing an Adoption Agreement in the form attached hereto as
Exhibit G, agreeing to be bound by and subject to the terms of this Agreement as a Common Holder and thereafter such person shall be deemed a stockholder for all purposes under this Agreement.
 

  
 41 

 (k)    Each transferee or assignee of any Shares subject to this
Agreement shall continue to be subject to the terms hereof, and, as a condition precedent to the Company’s recognition of such transfer, each transferee or assignee shall agree in writing to be subject to each of the terms of this Agreement by
executing and delivering an Adoption Agreement substantially in the form attached hereto as Exhibit G. Upon the execution and delivery of an Adoption Agreement by any transferee, such transferee shall be deemed to be a party hereto as if such
transferee were the transferor and such transferee’s signature appeared on the signature pages of this Agreement and shall be deemed to be a Common Holder, as applicable. The Company shall not permit the transfer of the Shares subject to this
Agreement on its books or issue a new certificate representing any such Shares unless and until such transferee shall have complied with the terms of this Section 7.6(k). Each certificate instrument, or book entry representing the Shares
subject to this Section 7.6 if issued on or after the date of this Agreement shall be notated by the Company with a legend reading substantially as follows: 

“THE SHARES REPRESENTED HEREBY ARE SUBJECT TO A NOTE PURCHASE AGREEMENT, AS MAY BE AMENDED FROM TIME TO TIME, (A COPY OF WHICH MAY BE
OBTAINED UPON WRITTEN REQUEST FROM THE COMPANY), AND BY ACCEPTING ANY INTEREST IN SUCH SHARES THE PERSON ACCEPTING SUCH INTEREST SHALL BE DEEMED TO AGREE TO AND SHALL BECOME BOUND BY ALL THE PROVISIONS OF THAT NOTE PURCHASE AGREEMENT, INCLUDING
CERTAIN RESTRICTIONS ON VOTING, TRANSFER AND OWNERSHIP SET FORTH THEREIN.” 
 The Company, by its execution of this Agreement, agrees that it will
cause the certificates instruments, or book entry evidencing the Shares issued after the date hereof to be notated with the legend required by this Section 7.6(k), and it shall supply, free of charge, a copy of this Agreement to any holder of
such Shares upon written request from such holder to the Company at its principal office. The parties to this Agreement do hereby agree that the failure to cause the certificates, instruments, or book entry evidencing the Shares to be notated with
the legend required by this Section 7.6(k) herein and/or the failure of the Company to supply, free of charge, a copy of this Agreement as provided hereunder shall not affect the validity or enforcement of this Agreement. 

(l)    In the event of any issuance of Shares or the voting securities of the Company hereafter to any of the Common
Holders (including, without limitation, in connection with any stock split, stock dividend, recapitalization, reorganization, or the like), such Shares shall become subject to this Agreement and shall be notated with the legend set forth in
Section 7.6(k). 
 (m)    The voting of Shares pursuant to this Agreement may be effected in person, by proxy, by
written consent or in any other manner permitted by applicable law. For the avoidance of doubt, voting of the Shares pursuant to the Agreement need not make explicit reference to the terms of this Agreement.  

(n)    The Company will promptly pay or reimburse the directors for all reasonable out-of-pocket expenses incurred in connection with attending Board or committee meetings of the Company or in performing their duties as directors of the Company (including

  
 42 

 
expenses incurred in performing their duties as members of committees of the Board); provided, however, that, except as set forth above, the Company shall not compensate any non-employee director appointed by Takeda or its affiliates, other than in connection with performing work relating to the Company at the express request of the Company or the Board. 

7.7    Protective Provisions. So long as a majority of the principal amount of the Notes originally
issued pursuant to this Agreement remains outstanding, the Company shall not (by amendment, merger, consolidation or otherwise) without (in addition to any other vote required by law or the Certificate of Incorporation) first obtaining the written
consent of the Requisite Noteholders: 
 (a)    consummate a Corporate Transaction; 

(b)    amend, alter or repeal any provision of the Certificate of Incorporation or Bylaws; 

(c)    authorize or issue any debt security (other than the Notes) in excess of $250,000 in the aggregate; 

(d)    redeem, purchase or otherwise acquire (or pay into or set aside for a sinking fund for such purpose) any share or
shares of Preferred Stock or Common Stock; provided, however, that this restriction shall not apply to the repurchase of shares of Common Stock from employees, officers, directors, consultants or other persons performing services for
the Company or any subsidiary pursuant to agreements under which the Company has the option to repurchase such shares upon the occurrence of certain events, such as the termination of employment or service, or pursuant to a right of first refusal;

 (e)    issue, create or authorize the creation of any security that is senior to the Notes or otherwise more
favorable to the purchasers thereof than the terms of the Notes; 
 (f)    change the authorized number of directors of
the Company; and 
 (g)    pay or declare any dividend on any shares of capital stock of the Company prior to the
repayment or conversion of the Notes in accordance with the terms of this Agreement other than dividends payable on the Common Stock solely in the form of additional shares of Common Stock. 

7.8    Directors’ and Officers’ Insurance. The Company has as
of the date hereof or shall within thirty (30) days of the date hereof use its commercially reasonable efforts to obtain from financially sound and reputable insurers directors and officers liability insurance in an amount and on terms and
conditions satisfactory to the Board, and will use its commercially reasonable efforts to cause such insurance policy to be maintained until such time as the Board determines that such insurance should be discontinued. 

7.9    Observer Rights. 

(a)    Abingworth Observer Right. As long as Abingworth Bioventures 8 LP (“Abingworth”) holds a
Note (or securities issued upon the conversion thereof), the Company 

  
 43 

 
shall invite a representative of Abingworth, who shall initially be Andrew Sinclair, to attend all meetings of its Board in a nonvoting observer capacity and, in this respect, shall give such
representative copies of all notices, minutes, consents and other materials that it provides to its directors; provided, however, that such representative shall agree to hold in confidence and trust with respect to all information so
provided; and, provided further, that the Company reserves the right to withhold any information and to exclude such representative from any meeting or portion thereof if access to such information or attendance at such meeting could adversely
affect the attorney-client privilege between the Company and its counsel. 
 (b)    RA Capital Observer Right.
As long as RA Capital Healthcare Fund, L.P. (“RA Capital”) holds a Note (or securities issued upon the conversion thereof), the Company shall invite a representative of RA Capital, who shall initially be Jake Simson, to attend all
meetings of its Board in a nonvoting observer capacity and, in this respect, shall give such representative copies of all notices, minutes, consents and other materials that it provides to its directors; provided, however, that such
representative shall agree to hold in confidence and trust with respect to all information so provided; and, provided further, that the Company reserves the right to withhold any information and to exclude such representative from any meeting or
portion thereof if access to such information or attendance at such meeting could adversely affect the attorney-client privilege between the Company and its counsel. 

(c)    Termination of Observer Rights. The rights described in this Section 7.9 shall terminate and be of no
further force or effect upon (i) such time as Abingworth or RA Capital, as applicable, no longer holds a Note (or securities issued upon the conversion thereof) (ii) the consummation of the Initial Public Offering, (iii) when the
Company first becomes subject to the periodic reporting requirements of Sections 12(g) or 15(d) of the Exchange Act and (iv) upon the consummation of a Corporate Transaction, whichever event shall first occur. The confidentiality obligations
referenced in this Section 7.9 will survive for a period of five (5) years following any such termination. 

7.10    Confidentiality. Each Lender agrees, severally and not jointly, to use the same degree of
care as such Lender uses to protect its own confidential information for any information obtained pursuant to this Agreement which the Company identifies in writing as being proprietary or confidential and such Lender acknowledges that it will not,
unless otherwise required by law or the rules of any national securities exchange, association or marketplace, disclose such information without the prior written consent of the Company except such information that (a) was in the public domain
prior to the time it was furnished to such Lender, (b) is or becomes (through no willful improper action or inaction by such Lender) generally available to the public, (c) was in its possession or known by such Lender without restriction
prior to receipt from the Company, (d) was rightfully disclosed to such Lender by a third party without restriction or (e) was independently developed without any use of the Company’s confidential information. Notwithstanding the
foregoing, each Lender that is a limited partnership or limited liability company may disclose such proprietary or confidential information to any former partners or members who retained an economic interest in such Lender, current or prospective
partner of the partnership or any subsequent partnership under common investment management, investment advisor, limited partner, general partner, member or management company of such Lender (or any employee or representative of any

  
 44 

 
of the foregoing) (each of the foregoing Persons, a “Permitted Disclosee”) or legal counsel, accountants, consultant or representatives for such Lender. Furthermore, nothing
contained herein shall prevent any Lender or any Permitted Disclosee from (i) entering into any business, entering into any agreement with a third party, or investing in or engaging in investment discussions with any other company (whether or
not competitive with the Company), provided that such Lender or Permitted Disclosee does not, except as permitted in accordance with this Section 7.10, disclose or otherwise make use of any proprietary or confidential information of the Company
in connection with such activities, or (ii) making any disclosures required by law, rule, regulation or court or other governmental order. The Company shall use the same degree of care as it uses to protect its own confidential information for
any information obtained pursuant to this Agreement which any such Lender identifies in writing as being proprietary or confidential and the Company acknowledges that it will not, unless otherwise required by law or the rules of any national
securities exchange, association or marketplace, disclose such information without the prior written consent of such Lender except such information that (a) was in the public domain prior to the time it was furnished to the Company, (b) is
or becomes (through no willful improper action or inaction by the Company) generally available to the public, (c) was in its possession or known by the Company without restriction prior to receipt from such Lender, (d) was rightfully
disclosed to the Company by a third party without restriction or (e) was independently developed without any use of such Lender confidential information. The confidentiality obligations set forth in this Section 7.10 will survive for a
period of five (5) years following the termination of this Agreement. 
 8.    Miscellaneous. 

8.1    Successors and Assigns. Except as otherwise provided herein, the terms and conditions of
this Agreement shall inure to the benefit of and be binding upon the respective successors and assigns of the parties; provided, however, the Company may not assign its obligations under this Agreement without the written consent of
the Requisite Noteholders. For the avoidance of doubt, a Lender that is a venture capital fund or private equity investor may assign or transfer its rights and obligations under this Agreement to its Affiliates. Nothing in this Agreement, express or
implied, is intended to confer upon any party other than the parties hereto or their respective successors and assigns any rights, remedies, obligations or liabilities under or by reason of this Agreement, except as expressly provided in this
Agreement. 
 8.2    Governing Law. This Agreement and the Notes shall be governed by and
construed under the laws of the State of Delaware as applied to agreements among Delaware residents, made and to be performed entirely within the State of Delaware, without regard to any choice of laws rules that may result in the application of the
laws of any other jurisdiction. 
 8.3    Counterparts; Delivery. This Agreement may be
executed by electronic signature and in two (2) or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one (1) and the same instrument. Counterparts may be delivered via electronic mail
(including pdf or any electronic signature complying with the U.S. federal ESIGN Act of 2000, e.g., www.docusign.com) or other 

  
 45 

 
transmission method and any counterpart so delivered shall be deemed to have been duly and validly delivered and be valid and effective for all purposes. 

8.4    Titles and Subtitles. The titles and subtitles used in this Agreement are used for
convenience only and are not to be considered in construing or interpreting this Agreement. 

8.5    Notices. All notices and other communications given or made pursuant hereto shall be in
writing and shall be deemed effectively given: (a) upon personal delivery to the party to be notified, (b) when sent by confirmed electronic mail or facsimile if sent during normal business hours of the recipient, if not so confirmed, then
on the next business day, (c) five (5) days after having been sent by registered or certified mail, return receipt requested, postage prepaid, or (d) one (1) day after deposit with a nationally recognized overnight courier, specifying next
day delivery, with written verification of receipt. All communications shall be sent to the respective parties at the following addresses (or at such other addresses as shall be specified by notice given in accordance with this Section 8.5):

 If to the Company: 

HilleVax, Inc. 
 601 Union
Street, Suite 3200 
 Seattle, Washington 98101 

Attention: Robert Hershberg 

With a copy to (which alone shall not constitute sufficient notice): 

Latham & Watkins LLP 

12670 High Bluff Drive 
 San
Diego, CA 92103 
 Attention: Cheston J. Larson 

Email:  
 Facsimile No.:

 If to Lenders: 
 At the
respective addresses shown on the signature pages hereto. 
 With a copy to (which alone shall not constitute sufficient notice): 

Gunderson Dettmer Stough Villeneuve Franklin & Hachigian, LLP 

One Marina Park Drive, Suite 900 

Boston, Massachusetts 02210 

Attention: Timothy H. Ehrlich 

Email:  
 Facsimile No.:

  
 46 

 8.6    Finder’s Fee. Each
party represents that it neither is nor will be obligated for any finder’s fee or commission in connection with this transaction. Each Lender, severally but not jointly, agrees to indemnify and to hold harmless the Company from any liability
for any commission or compensation in the nature of a finder’s fee (and the costs and expenses of defending against such liability or asserted liability) for which such Lender or any of its officers, partners, employees or representatives is
responsible. The Company agrees to indemnify and hold harmless each Lender from any liability for any commission or compensation in the nature of a finder’s fee (and the costs and expenses of defending against such liability or asserted
liability) for which the Company or any of its officers, employees or representatives is responsible. 

8.7    Expenses. If any action at law or in equity is necessary to enforce or interpret the terms
of this Agreement, the prevailing party shall be entitled to reasonable attorneys’ fees, costs and necessary disbursements in addition to any other relief to which such party may be entitled. Each party hereto shall pay all costs and expenses
that it incurs with respect to the negotiation, execution, delivery and performance of this Agreement. At the Closing, the Company shall reimburse the reasonable fees and expenses of Gunderson Dettmer Stough Villeneuve Franklin &
Hachigian, LLP, counsel for the Lenders, not to exceed $70,000. 
 8.8    Entire Agreement;
Amendments and Waivers. This Agreement, the Notes and the other documents expressly delivered pursuant hereto or in connection with the Closing hereunder constitute the full and entire understanding and agreement between the parties with regard
to the subjects hereof and thereof. The Company’s agreements with each of the Lenders are separate agreements, and the sales of the Notes to each of the Lenders are separate sales. Nonetheless, any term of this Agreement or the Notes may be
amended and the observance of any term of this Agreement or the Notes may be waived (either generally or in a particular instance and either retroactively or prospectively), with the written consent of the Company and the Requisite Noteholders;
provided that, following the conversion of the Notes into Equity Securities, any provision of Section 7.5 may be amended or waived with the written consent of the Company and the holders of a majority of the Registrable Securities then
outstanding; provided, in the event any Lender consents to the waiver of the provisions of Section 7.2 with respect to any offering of Shares by the Company and actually purchases any such Shares in such offering, then each other Lender who did
not consent to such waiver shall be permitted to participate in such offering (which may, at the Company’s option, be in a subsequent closing of such offering on substantially the same terms and conditions) on a pro rata basis (based on the
level of participation of the Lender purchasing the largest portion of such Lender’s pro rata share); provided, further that clause (ii) of Section 7.6(b) and this proviso shall not be amended, waived, modified or terminated without
the prior written consent of LSVP; provided, further that clause (iii) of Section 7.6(b) and this proviso shall not be amended, waived, modified or terminated without the prior written consent of Deerfield; and provided, further that
Section 8.11 shall not be amended, waived, modified or terminated in a manner adverse to any individual Lender without the prior written consent of such Lender. In addition, notwithstanding anything contained herein to the contrary, (i) no
term of this Agreement or the Notes may be amended or waived without the written consent of each Lender if such amendment or waiver materially, adversely and disproportionately affects such Lender 

  
 47 

 
in a manner different than all other Lenders, (ii) Section 1 of the Note held by each Lender shall not be amended or waived with respect to such Lender without the written consent of
such Lender, (iii) the outstanding principal and interest amount of the Note held by each Lender shall not be amended or waived with respect to such Lender without the written consent of such Lender, and (iv) Section 1(ff),
Section 7.2, Section 7.4 and Section 7.6(b)(iv) of this Agreement shall not be amended or waived with respect to Takeda without the written consent of Takeda. Any waiver or amendment effected in accordance with this Section 8.8
shall be binding upon each party to this Agreement and any holder of any Note purchased under this Agreement at the time outstanding and each future holder of all such Notes. 

8.9    Effect of Amendment or Waiver. Each Lender acknowledges that by the operation of
Section 8.8 hereof, and subject to the limitations set forth therein, the Requisite Noteholders will have the right and power to diminish or eliminate all rights of such Lender under this Agreement and each Note issued to such Lender. 

8.10    Severability. If one or more provisions of this Agreement are held to be unenforceable
under applicable law, such provision shall be excluded from this Agreement and the balance of the Agreement shall be interpreted as if such provision were so excluded and shall be enforceable in accordance with its terms. 

8.11    “Market Stand-Off”
Agreement. Each Lender hereby agrees that it will not, without the prior written consent of the managing underwriter, during the period commencing on the date of the final prospectus relating to the Initial Public Offering and ending on the date
specified by the Company and the managing underwriter (such period not to exceed one hundred eighty (180) days) (a) lend, offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to
sell, grant any option, right or warrant to purchase, or otherwise transfer or dispose of, directly or indirectly, any shares of Common Stock or any securities convertible into or exercisable or exchangeable for Common Stock held immediately prior
to the effectiveness of the registration statement for such offering, or (b) enter into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of the Common Stock or any
securities convertible into or exercisable or exchangeable for Common Stock held immediately prior to the effectiveness of the registration statement for such offering, whether any such transaction described in clause (a) or (b) above is
to be settled by delivery of Common Stock or other securities, in cash or otherwise. The foregoing provisions of this Section 8.11 shall apply only to the Company’s Initial Public Offering, shall not apply to the sale of any shares to an
underwriter pursuant to an underwriting agreement, and shall only be applicable to the Lenders if all officers, directors and greater than one percent (1%) stockholders of the Company enter into similar agreements. The underwriters in connection
with the Company’s Initial Public Offering are intended third-party beneficiaries of this Section 8.11 and shall have the right, power and authority to enforce the provisions hereof as though they were a party hereto. Each Lender further
agrees to execute such agreements as may be reasonably requested by the underwriters in the Company’s Initial Public Offering that are consistent with this Section 8.11 or that are necessary to give further effect thereto. Any
discretionary waiver or termination of the restrictions of any or all of such agreements by the Company or the underwriters shall apply 

  
 48 

 
to all Lenders subject to such agreements pro rata based on the number of shares subject to such agreements. 

In order to enforce the foregoing covenant, the Company may impose stop-transfer instructions with respect to the capital stock of the Company
of each Lender (and the shares or securities of every other person subject to the foregoing restriction) until the end of such period. 

Each Lender agrees that a legend reading substantially as follows shall be placed on all certificates representing all capital stock of the
Company of each Lender (and the shares or securities of every other person subject to the restriction contained in this Section 8.11): 

THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO A LOCK-UP PERIOD AFTER THE EFFECTIVE DATE
OF THE ISSUER’S REGISTRATION STATEMENT FILED UNDER THE SECURITIES ACT, AS AMENDED, AS SET FORTH IN AN AGREEMENT BETWEEN THE COMPANY AND THE ORIGINAL HOLDER OF THESE SECURITIES, A COPY OF WHICH MAY BE OBTAINED AT THE ISSUER’S PRINCIPAL
OFFICE. SUCH LOCK-UP PERIOD IS BINDING ON TRANSFEREES OF THESE SHARES. 

8.12    Financing Documents. Each Lender understands and agrees that the conversion of the Notes
into Conversion Shares may require such Lender’s execution of certain agreements in the form agreed to by investors in the Next Equity Financing or Non-Qualified Next Equity Financing relating to the
purchase and sale of such securities as well as registration, co-sale, rights of first refusal, rights of first offer and voting rights, if any, relating to such securities; provided, however,
that in no event shall conversion be conditioned upon any Lender be required to agree to undertake liability under any compelled voting (i.e., drag along provisions) for any third party (other than the Company) or that exceeds the consideration
received or to be received by such party or to grant any proxy with respect to voting of shares. 

8.13    MFN Right. In the event that the Company issues convertible notes (or similar convertible
instruments) at any time after the date hereof which have terms that are more favorable to the Lenders than the terms of the Notes, such as, but not limited to, a higher interest rate, lower capped valuation or larger discount to the applicable
conversion price, but which shall not include any Board representation or observer rights afforded to a specific Lender by reason of the magnitude of their investment (the “MFN Notes”), the Company shall promptly amend the terms of
the Notes to provide substantially equivalent terms to the Lender as the MFN Notes without further consideration. 

8.14    Exculpation Among Lenders. Each Lender acknowledges that it is not relying upon any person,
firm, corporation or stockholder, other than the Company and its officers and directors in their capacities as such, in making its investment or decision to invest in the Company. Each Lender agrees that no other Lender nor the respective
controlling persons, officers, directors, partners, agents, stockholders or employees of any other Lender shall be liable for any action heretofore or hereafter taken or omitted to be taken by any of them in connection with the purchase and sale of
the Securities. 

  
 49 

 8.15    Acknowledgement. In order to avoid
doubt, it is acknowledged that each Lender shall be entitled to the benefit of all adjustments in the number of shares of Common Stock of the Company directly or indirectly issuable upon conversion of the Notes or as a result of any splits,
recapitalizations, combinations or other similar transaction affecting the Common Stock or the Conversion Shares. 

8.16     Indemnity; Costs, Expenses and Attorneys’ Fees. The Company shall
indemnify and hold each Lender harmless from any loss, cost, liability and legal or other expense, including attorneys’ fees of such Lender’s counsel, which a Lender may directly or indirectly suffer or incur by reason of the failure of
the Company to perform any of its obligations under this Agreement, any Note, any agreement executed in connection herewith or therewith, any grant of or exercise of remedies with respect to any collateral at any time securing any obligations
evidenced by this Agreement or the Notes, or any Lender’s execution or performance of this Agreement or any agreement executed in connection herewith; provided, however, the indemnity agreement contained in this section shall not
apply to liabilities which a Lender may directly or indirectly suffer or incur by reason of Lender’s own gross negligence or willful misconduct. 

8.17    Further Assurance. From time to time, the Company shall use its commercially reasonable
efforts to execute and deliver to the Lenders such additional documents to the Lenders as the Requisite Noteholders may reasonably require to carry out the terms of this Agreement and the Notes and any agreements executed in connection herewith or
therewith. 
 8.18    Dispute Resolution. The parties (a) hereby irrevocably and
unconditionally submit to the jurisdiction of the state courts of State of Delaware and to the jurisdiction of the United States District Court for the District of Delaware for the purpose of any suit, action or other proceeding arising out of or
based upon this Agreement, (b) agree not to commence any suit, action or other proceeding arising out of or based upon this Agreement except in the state courts of or the United States District Court for the District of Delaware, and
(c) hereby waive, and agree not to assert, by way of motion, as a defense, or otherwise, in any such suit, action or proceeding, any claim that it is not subject personally to the jurisdiction of the foregoing courts, that its property is
exempt or immune from attachment or execution, that the suit, action or proceeding is brought in an inconvenient forum, that the venue of the suit, action or proceeding is improper or that this Agreement or the subject matter hereof may not be
enforced in or by such court. 
 8.19     Waiver of Jury Trial. TO THE EXTENT EACH MAY LEGALLY DO
SO, EACH PARTY HERETO HEREBY EXPRESSLY WAIVES ANY RIGHT TO TRIAL BY JURY OF ANY CLAIM, DEMAND, ACTION, CAUSE OF ACTION, OR PROCEEDING ARISING UNDER OR WITH RESPECT TO THIS AGREEMENT, OR IN ANY WAY CONNECTED WITH, OR RELATED TO, OR INCIDENTAL TO, THE
DEALING OF THE PARTIES HERETO WITH RESPECT TO THIS AGREEMENT, OR THE TRANSACTIONS RELATED THERETO, IN EACH CASE WHETHER NOW EXISTING OR HEREAFTER ARISING, AND IRRESPECTIVE OF WHETHER SOUNDING IN CONTRACT, TORT, OR OTHERWISE. TO THE EXTENT EACH MAY
LEGALLY DO SO, EACH PARTY HERETO HEREBY AGREES THAT ANY SUCH 

  
 50 

 
CLAIM, DEMAND, ACTION, OR PROCEEDING SHALL BE DECIDED BY A COURT TRIAL WITHOUT A JURY AND THAT EITHER PARTY HERETO MAY FILE AN ORIGINAL COUNTERPART OR A COPY OF THIS AGREEMENT WITH ANY COURT AS
WRITTEN EVIDENCE OF THE CONSENT OF ANY OTHER PARTY HERETO TO THE WAIVER OF ITS RIGHT TO TRIAL BY JURY. 

8.20    Survival. The representations, warranties, covenants and agreements made herein shall
survive the closing of the transactions contemplated hereby. 
 8.21    Spousal Consent. If any
individual Common Holder is married on the date of this Agreement, such Common Holder’s spouse shall execute and deliver to the Company a consent of spouse in the form of Exhibit H hereto (“Consent of Spouse”), effective on the date
hereof. Notwithstanding the execution and delivery thereof, such consent shall not be deemed to confer or convey to the spouse any rights in such Common Holder’s Shares that do not otherwise exist by operation of law or the agreement of the
parties. If any individual Common Holder should marry or remarry subsequent to the date of this Agreement, such Common Holder shall within thirty (30) days thereafter obtain his/her new spouse’s acknowledgement of and consent to the
existence and binding effect of all restrictions contained in this Agreement by causing such spouse to execute and deliver a Consent of Spouse acknowledging the restrictions and obligations contained in this Agreement and agreeing and consenting to
the same. 
 8.22    Limitation of Liability; Freedom to Operate Affiliates. 

(a)    Other than as set forth below Section 8.22(b), the total liability, in the aggregate, of each Lender, and
their respective Affiliates and their respective officers, directors, employees, consultants and agents, for any and all monetary claims, losses, costs or damages, including attorneys’ and accountants’ fees and expenses and costs of any
nature whatsoever or claims or expenses resulting from or in any way related to this Agreement or the Notes from any cause or causes shall be several and not joint with the other Lenders (and no Lender shall have any liability for the actions of any
other Lender) and shall not exceed the total Consideration paid to the Company by such Lender for the Notes under this Agreement; provided, however, that this Section 8.22 shall (i) in no way limit the Company’s right to
equitable relief, including injunctive relief and specific performance from a Lender, (ii) apply to breaches of a Lender’s confidentiality obligation, or (iii) limit liability for a Lender’s conduct that is judicially determined
to be bad faith, fraud or willful misconduct. Nothing in this Agreement or the Notes shall restrict a Lender’s freedom to operate any of its Affiliates or to engage in any business (including ones in competition with the Company). 

(b)    Nothing in Section 8.22(a) shall modify any Lender’s confidentiality obligations or the fiduciary duties
of any director designated by Lender or the contractual restrictions on any Lender-designated Board observer. 
 [Signature pages follow.]

  
 51 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	HILLEVAX, INC.
		
	By:	 	 /s/ Robert Hershberg

	Name:	 	Robert Hershberg
	Title:	 	President and Chief Executive Officer

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	FRAZIER LIFE SCIENCES X, L.P.
	
	By: FHMLS X, L.P.
	Its general partner
	
	By: FHMLS X, L.L.C.
	Its general partner
		
	By:	 	 /s/ Patrick Heron

	Name:	 	Patrick Heron
	Title:	 	Managing Director
	
	Address:
	
	With a copy to:

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	LIGHTSPEED VENTURE PARTNERS SELECT IV, L.P.
	
	By: Lightspeed General Partner Select IV, L.P.,
	      its general partner
	
	By: Lightspeed Ultimate General Partner Select IV,
	    L.L.C., its general partner
		
	By:	 	 /s/ Ravi Mhatre

 
			
		 	        Duly authorized signatory

 
			
		
	Address:	 	2200 Sand Hill Road
		 	Menlo Park, CA 94025
		 	Email: finance@lsvp.com

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	LIGHTSPEED FRONTIER I-M L.P.
		
	By:	 	Lightspeed Frontier I-M GP LLC,
		 	its general partner
		
	By:	 	 /s/ Ravi Mhatre

	Name:	 	Ravi Mhatre
	Title:	 	Manager
	
	Address:

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	LIGHTSPEED FRONTIER I-E L.P.
		
	By:	 	Lightspeed Frontier I-E GP LLC,
		 	its general partner
		
	By:	 	 /s/ Barry Eggers

	Name:	 	Barry Eggers
	Title:	 	Manager
	
	Address:

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	LIGHTSPEED FRONTIER I-N L.P.
		
	By:	 	Lightspeed Frontier I-N GP LLC,
		 	its general partner
		
	By:	 	 /s/ Peter Nieh

	Name:	 	Peter Nieh
	Title:	 	Manager
	
	Address:

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	RA CAPITAL HEALTHCARE FUND, L.P.
	
	By: RA Capital Healthcare Fund GP, LLC
	Its general partner
		
	By:	 	 /s/ Peter Kolchinsky

	Name:	 	Peter Kolchinsky
	Title:	 	Manager
	
	Address:

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	RA CAPITAL NEXUS FUND II, L.P.
	
	By: RA Capital Nexus Fund II GP, LLC
	Its general partner
		
	By:	 	 /s/ Peter Kolchinsky

	Name:	 	Peter Kolchinsky
	Title:	 	Manager
	
	Address:

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	CATALYS PACIFIC FUND, LP
	
	By its general partner: Catalys Pacific Fund GP, L.P.
	
	By its general partner: Catalys Pacific LLC
		
	By:	 	 /s/ Brian Taylor Slingsby

	Name:	 	Brian Taylor Slingsby, MD, PHD, MPH
	Title:	 	Managing Director
	
	Address:

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	SAMSARA BIOCAPITAL, L.P.
		
	By:	 	Samsara BioCapital GP, LLC,
		 	General Partner
		
	By:	 	 /s/ Srinivas Akkaraju

	Name:	 	Srinivas Akkaraju, M.D., Ph.D.
	Title:	 	Managing Member
	
	Address:
		
	Email:	 	
	
	436, L.P.
		
	By:	 	436 GP, LLC,
		 	General Partner
		
	By:	 	 /s/ Srinivas Akkaraju

	Name:	 	Srinivas Akkaraju, M.D., Ph.D.
	Title:	 	Managing Member
	
	Address:
		
	Email:	 	

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	DEERFIELD PRIVATE DESIGN FUND V, L.P.
	
	By: Deerfield Mgmt V, L.P.
	General Partner
	
	      By: J.E. Flynn Capital V, LLC
	      General Partner
		
	By:	 	 /s/ David J. Clark

	Name:	 	David J. Clark
	Title:	 	Authorized Signatory
	
	Address:

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	ABINGWORTH BIOVENTURES 8 LP
	
	Acting by its Manager Abingworth LLP
		
	By:	 	 /s/ John Heard

	Name:	 	John Heard
	Title:	 	Partner, General Counsel
		
	Address:	 	
		
		 	Attn:
		 	Email:

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	PERCEPTIVE LIFE SCIENCES MASTER FUND, LTD.
	
	By: Perceptive Advisors, LLC
		
	By:	 	 /s/ James Mannix

	Name:	 	James H. Mannix
	Title:	 	COO
	
	Address:

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	FRANKLIN STRATEGIC SERIES – FRANKLIN BIOTECHNOLOGY DISCOVERY FUND
	
	By: Franklin Advisers, Inc., as Investment Manager
		
	By:	 	 /s/ Evan McCulloch

	Name:	 	Evan McCulloch
	Title:	 	Vice President
		
	Address:	 	
		
		 	With a copy to:

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	FRANKLIN TEMPLETON INVESTMENT FUNDS – FRANKLIN BIOTECHNOLOGY DISCOVERY
FUND
	
	By: Franklin Advisers, Inc., as Investment Manager
		
	By:	 	 /s/ Evan McCulloch

	Name:	 	Evan McCulloch
	Title:	 	Vice President
	
	Address:
		
		 	With a copy to:

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	BIOTECHNOLOGY VALUE FUND, L.P.
		
	By:	 	 /s/ Mark Lampert

	Name:	 	Mark Lampert
	Title:	 	Chief Executive Officer BVF I GP LLC, itself General Partner of Biotechnology Value Fund, L.P.
	
	Address:
	
	BIOTECHNOLOGY VALUE FUND II, L.P.
		
	By:	 	 /s/ Mark Lampert

	Name:	 	Mark Lampert
	Title:	 	Chief Executive Officer BVF II GP LLC, itself General Partner of Biotechnology Value Fund II, L.P.
	
	Address:
	
	BIOTECHNOLOGY VALUE TRADING FUND OS, L.P.
		
	By:	 	 /s/ Mark Lampert

	Name:	 	Mark Lampert
	Title:	 	President BVF Inc., General Partner of BVF Partners L.P., itself sole member of BVF Partners OS Ltd., itself General Partner of Biotechnology Value Trading Fund OS, L.P.
		
	Address:	 	

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	GREENSPRING EARLY STAGE II, L.P.
		
	By:	 	Greenspring Early Stage General Partner II, L.P.
		 	its general partner
		
	By:	 	Greenspring Early Stage GP II, LLC
		 	its general partner
		
	By:	 	Greenspring Associates, LLC
		 	its sole member
		
	By:	 	 /s/ Eric Thompson

	Name:	 	Eric Thompson
	Title:	 	Chief Operating Officer
	
	Address:

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	GREENSPRING EARLY STAGE II-G, L.P.
		
	By:	 	Greenspring Early Stage General Partner II, L.P.
		 	its general partner
		
	By:	 	Greenspring Early Stage GP II, LLC
		 	its general partner
		
	By:	 	Greenspring Associates, LLC
		 	its sole member
		
	By:	 	 /s/ Eric Thompson

	Name:	 	Eric Thompson
	Title:	 	Chief Operating Officer
	
	Address:

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	GREENSPRING EARLY STAGE II-K, L.P.
		
	By:	 	Greenspring Early Stage General Partner II, L.P.
		 	its general partner
		
	By:	 	Greenspring Early Stage GP II, LLC
		 	its general partner
		
	By:	 	Greenspring Associates, LLC
		 	its sole member
		
	By:	 	 /s/ Eric Thompson

	Name:	 	Eric Thompson
	Title:	 	Chief Operating Officer
	
	Address:

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	QIMING U.S. HEALTHCARE FUND II, L.P.
		
	 By:
	 	 Qiming U.S. Healthcare GP II, LLC,
 its General
Partner

		
	By:	 	 /s/ Colin Walsh

	Name:	 	Colin Walsh
	Title:	 	Partner
		
	Address:	 	
	
	with a copy, which shall not constitute notice, to:
		
		 	DLA Piper LLP (US)

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	RICHARD KING MELLON FOUNDATION
		
	By:	 	 /s/ Douglas L. Sisson

	Name:	 	Douglas L. Sisson
	Title:	 	Treasurer and Vice President
		
	Address:	 	
	
	MELLON FAMILY INVESTMENT COMPANY V
	
	By its General Partner, MFIC V, LLC
		
	By:	 	 /s/ Douglas L. Sisson

	Name:	 	Douglas L. Sisson
	Title:	 	Member
	
	Address:

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	LENDERS:
	
	SAHSEN VENTURES, LLC
		
	By:	 	 /s/ Bryan White

	Name:	 	Bryan White
	Title:	 	Managing Member
	
	Address:

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first above
written. 
  

			
	COMMON HOLDERS:
	
	David A. Socks 2013 Revocable Trust
		
	By:	 	 /s/ David Socks

	Name:	 	David Socks
	Title:	 	Trustee
	
	 /s/ Robert Hershberg

	Robert Hershberg
	
	 /s/ Aditya Kohli

	Aditya Kohli

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 Executed as of the date first above written, solely with respect to Section 1(hh),
Section 7.2, Section 7.4, Section 7.6 and Section 8.8 of this Agreement and not as a “Party” to this Agreement for any other reason: 

 

			
	TAKEDA:
	
	Takeda Vaccines, Inc.
		
	By:	 	 /s/ Rajeev Venkayya

	Name:	 	Rajeev Venkayya, MD
	Title:	 	President, Global Vaccine Business Unit

  

SIGNATURE PAGE TO 

NOTE PURCHASE AGREEMENT 

 SCHEDULE OF LENDERS 

CLOSING 
  

					
	 Lender
	  	Total Consideration
(Principal Balance of
Promissory Note)	 
	 Frazier Life Sciences X, L.P.
	  	$	4,520,958.48	(1) 
	 Frazier Life Sciences X, L.P.
	  	$	6,251,152.33	(2) 
	 Frazier Life Sciences X, L.P.
	  	$	25,000,000.00	 
	 Lightspeed Venture Partners Select IV, L.P.
	  	$	9,625,000.00	 
	 Lightspeed Frontier I-M L.P.
	  	$	125,000.00	 
	 Lightspeed Frontier I-E L.P.
	  	$	125,000.00	 
	 Lightspeed Frontier I-N L.P.
	  	$	125,000.00	 
	 RA Capital Healthcare Fund, L.P.
	  	$	12,250,000.00	 
	 RA Capital Nexus Fund II, L.P.
	  	$	5,250,000.00	 
	 Deerfield Private Design Fund V, L.P.
	  	$	15,000,000.00	 
	 Abingworth Bioventures 8 LP
	  	$	12,500,000.00	 
	 Perceptive Life Sciences Master Fund, Ltd.
	  	$	10,000,000.00	 
	 Franklin Templeton Investment Funds – Franklin Biotechnology Discovery Fund
	  	$	4,847,100.00	 
	 Franklin Strategic Series – Franklin Biotechnology Discovery Fund
	  	$	2,652,900.00	 
	 Catalys Pacific Fund, LP
	  	$	7,500,000.00	 
	 Samsara BioCapital, L.P.
	  	$	6,062,500.00	 
	 436, L.P.
	  	$	187,500.00	 
	 Biotechnology Value Fund, L.P.
	  	$	2,681,274.00	 
	 Biotechnology Value Fund II, L.P.
	  	$	2,010,521.00	 
	 Biotechnology Value Trading Fund OS, L.P.
	  	$	308,205.00	 
	 Greenspring Early Stage II, L.P.
	  	$	3,945,414.00	 

					
	 Greenspring Early Stage II-G, L.P.
	  	$	735,486.00	 
	 Greenspring Early Stage II-K, L.P.
	  	$	319,100.00	 
	 Qiming U.S. Healthcare Fund II, L.P.
	  	$	5,000,000.00	 
	 Richard King Mellon Foundation
	  	$	750,000.00	 
	 Mellon Family Investment Company V
	  	$	750,000.00	 
	 Sahsen Ventures, LLC
	  	$	1,000,000.00	 
	 TOTAL
	  	$	139,522,110.81	 
		  	  
	  
	 

  

	(1)	 The Consideration for this Note is an exchange for the existing convertible notes originally issued by each of
MokshaCo, Inc. ($500,000 principal amount), North Bridge V, Inc. (later renamed HilleVax, Inc.)($428,005.51 principal amount) and YamadaCo III, Inc. ($1,286,173.93 principal amount) to Frazier as of the Closing, which convertible notes were assumed
by the Company in connection with the merger of MokshaCo, Inc. and YamadaCo III, Inc. with and into the Company in February 2021. Such convertible notes shall be null and void upon the issuance of the Note in the amount of $4,520,958.48,
representing the as converted principal and accrued interest on such convertible notes as of the Closing. 

	(2)	 The Consideration for this Note is an exchange for the additional convertible notes issued by the Company
($6,250,000 principal amount) to Frazier from April 22, 2021 through July 27, 2021, which shall be null and void upon the issuance of the Note in the amount of $6,251,152.33, representing the principal and accrued interest on such
convertible notes as of the Closing.EX-10.1

 Exhibit 10.1 

HILLEVAX, INC. 
 2021
EQUITY INCENTIVE PLAN 
 1.    Purpose. 

The purpose of the Plan is to advance the interests of the Company’s stockholders by enhancing the Company’s ability to attract,
retain and motivate persons who make (or are expected to make) important contributions to the Company by providing such persons with equity ownership opportunities and thereby better aligning the interests of such persons with those of the
Company’s stockholders. Capitalized terms used in the Plan are defined in Section 11 below. 

2.    Eligibility.  

Service Providers are eligible to be granted Awards under the Plan, subject to the limitations described herein. 

3.    Administration and Delegation. 

(a)    Administration. The Plan will be administered by the Administrator. The Administrator shall have authority to
determine which Service Providers will receive Awards, to grant Awards and to set all terms and conditions of Awards (including, but not limited to, vesting, exercise and forfeiture provisions). In addition, the Administrator shall have the
authority to take all actions and make all determinations contemplated by the Plan and to adopt, amend and repeal such administrative rules, guidelines and practices relating to the Plan as it shall deem advisable. The Administrator may correct any
defect or ambiguity, supply any omission or reconcile any inconsistency in the Plan or any Award in the manner and to the extent it shall deem necessary or appropriate to carry the Plan and any Awards into effect, as determined by the Administrator.
The Administrator shall make all determinations under the Plan in the Administrator’s sole discretion and all such determinations shall be final and binding on all persons having or claiming any interest in the Plan or in any Award. 

(b)    Appointment of Committees. To the extent permitted by Applicable Laws, the Board may delegate any or all of
its powers under the Plan to one or more Committees. The Board may abolish any Committee at any time and re-vest in itself any previously delegated authority. 

4.    Stock Available for Awards. 

(a)    Number of Shares. Subject to adjustment under Section 8 hereof, Awards may be made under the Plan
covering up to 2,212,500 shares of Common Stock. If any Award expires or lapses or is terminated, surrendered or canceled without having been fully exercised or is forfeited in whole or in part (including as the result of shares of Common Stock
subject to such Award being repurchased by the Company at or below the original issuance price), in any case in a manner that results in any shares of Common Stock covered by such Award not being issued or being so reacquired by the Company, the
unused Common Stock covered by such Award shall again be available for the grant of Awards under the Plan. Further, shares of Common Stock delivered (either by actual delivery or attestation) to the Company by a Participant to satisfy the applicable
exercise or purchase price of an Award and/or to satisfy any applicable tax withholding obligation (including shares retained by the Company from the Award being exercised or purchased and/or creating the tax obligation) shall be added to the number
of shares of Common Stock available for the grant of Awards under the Plan. However, in the case of Incentive Stock Options (as hereinafter defined), the foregoing provisions shall be subject to any 

 
limitations under the Code. Shares of Common Stock issued under the Plan may consist in whole or in part of authorized but unissued shares, shares purchased on the open market or treasury shares.

 (b)    Substitute Awards. In connection with a merger or consolidation of an entity with the Company or the
acquisition by the Company of property or stock of an entity, the Administrator may grant Awards in substitution for any options or other stock or stock-based awards granted prior to such merger or consolidation by such entity or an affiliate
thereof. Substitute Awards may be granted on such terms as the Administrator deems appropriate in the circumstances, notwithstanding any limitations on Awards contained in the Plan. Substitute Awards shall not count against the overall share limit
set forth in Section 4(a) hereof, except as may be required by reason of Section 422 of the Code. 

5.    Stock Options. 

(a)    General. The Administrator may grant Options to any Service Provider, subject to the limitations on Incentive
Stock Options described below. The Administrator shall determine the number of shares of Common Stock to be covered by each Option, the exercise price of each Option and the conditions and limitations applicable to the exercise of each Option,
including conditions relating to Applicable Laws, as it considers necessary or advisable. 
 (b)    Incentive Stock
Options. The Administrator may grant Options intended to qualify as Incentive Stock Options only to employees of the Company, any of the Company’s present or future “parent corporations” or “subsidiary corporations” as
defined in Sections 424(e) or (f) of the Code, respectively, and any other entities the employees of which are eligible to receive Incentive Stock Options under the Code. All Options intended to qualify as Incentive Stock Options shall be
subject to and shall be construed consistently with the requirements of Section 422 of the Code. Neither the Company nor the Administrator shall have any liability to a Participant, or any other party, (i) if an Option (or any part
thereof) which is intended to qualify as an Incentive Stock Option fails to qualify as an Incentive Stock Option or (ii) for any action or omission by the Administrator that causes an Option not to qualify as an Incentive Stock Option,
including without limitation, the conversion of an Incentive Stock Option to a Non-Qualified Stock Option or the grant of an Option intended as an Incentive Stock Option that fails to satisfy the requirements
under the Code applicable to an Incentive Stock Option. Any Option that is intended to qualify as an Incentive Stock Option, but fails to so qualify for any reason, including without limitation, the portion of any Option becoming exercisable in
excess of the $100,000 limitation described in Treasury Regulation Section 1.422-4, shall be treated as a Non-Qualified Stock Option for all purposes. 

(c)    Exercise Price. The Administrator shall establish the exercise price of each Option and specify the exercise
price in the applicable Award Agreement. The exercise price shall be not less than 100% of the Fair Market Value on the date the Option is granted. In the case of an Incentive Stock Option granted to an employee who, at the time of grant of the
Option, owns (or is treated as owning under Section 424 of the Code) stock representing more than 10% of the voting power of all classes of stock of the Company (or a “parent corporation” or “subsidiary corporation” thereof
within the meaning of Sections 424(e) or 424(f) of the Code, respectively), the per share exercise price shall be no less than 110% of the Fair Market Value on the date the Option is granted. 

(d)    Duration of Options. Each Option shall be exercisable at such times and subject to such terms and conditions
as the Administrator may specify in the applicable Award Agreement, provided that the term of any Option shall not exceed ten years. In the case of an Incentive Stock Option granted to an employee who, at the time of grant of the Option, owns (or is
treated as owning under Section 424 of the Code) stock representing more than 10% of the voting power of all classes of stock of the Company (or a “parent corporation” or “subsidiary corporation” thereof within the meaning
of Sections 424(e) or 424(f) of the Code, respectively), the term of the Option shall not exceed five years. 

  
 2 

 (e)    Exercise of Option; Notification of Disposition. Options
may be exercised by delivery to the Company of a written notice of exercise, in a form approved by the Administrator (which may be an electronic form), signed by the person authorized to exercise the Option, together with payment in full (i) as
specified in Section 5(f) hereof for the number of shares for which the Option is exercised and (ii) as specified in Section 9(e) hereof for any applicable withholding taxes. Unless otherwise determined by the Administrator, an Option
may not be exercised for a fraction of a share of Common Stock. If an Option is designated as an Incentive Stock Option, the Participant shall give prompt notice to the Company of any disposition or other transfer of any shares of Common Stock
acquired from the Option if such disposition or transfer is made (i) within two years from the grant date with respect to such Option or (ii) within one year after the transfer of such shares to the Participant (other than any such
disposition made in connection with a Change in Control). 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. 
 (f)    Payment Upon Exercise. Common Stock purchased upon
the exercise of an Option granted under the Plan shall be paid for in cash, by wire transfer of immediately available funds or by check, payable to the order of the Company, or, subject to Section 10(h), any Company insider trading policy
(including, without limitation, any blackout periods) and Applicable Laws, by: 
 (i)    if the Company
is a Publicly Listed Company, unless the Administrator otherwise determines, (A) delivery of an irrevocable and unconditional undertaking by a broker acceptable to the Company to deliver promptly to the Company sufficient funds to pay the
exercise price, or (B) delivery by the Participant to the Company of a copy of irrevocable and unconditional instructions to a broker acceptable to the Company to deliver promptly to the Company cash or a check sufficient to pay the exercise
price, provided in either case, that such amount is paid to the Company at such time as may be required by the Administrator; 

(ii)    to the extent permitted by the Administrator, delivery (either by actual delivery or attestation)
of shares of Common Stock owned by the Participant valued at their Fair Market Value, provided (A) such method of payment is then permitted under Applicable Laws, (B) such Common Stock, if acquired directly from the Company, was owned by
the Participant for such minimum period of time, if any, as may be established by the Company at any time, and (C) such Common Stock is not subject to any repurchase, forfeiture, unfulfilled vesting or other similar requirements; 

(iii)    to the extent permitted by the Administrator, surrendering shares of Common Stock then issuable
upon exercise of the Option valued at their Fair Market Value on the date of exercise; 
 (iv)    to the
extent permitted by the Administrator, delivery of a promissory note of the Participant to the Company on terms determined by the Administrator; 

(v)    to the extent permitted by the Administrator, delivery of property of any other kind which
constitutes good and valuable consideration as determined by the Administrator; or 
 (vi)    to the
extent permitted by the Administrator, any combination of the above permitted forms of payment (including cash or check). 

(g)    Early Exercise of Options. The Administrator may provide in the terms of an Award Agreement that the Service
Provider may exercise an Option in whole or in part prior to the full vesting of the Option in exchange for unvested shares of Restricted Stock with respect to any unvested 

  
 3 

 
portion of the Option so exercised. Shares of Restricted Stock acquired upon the exercise of any unvested portion of an Option shall be subject to such terms and conditions as the Administrator
shall determine. 
 6.    Restricted Stock; Restricted Stock Units. 

(a)    General. The Administrator may grant Restricted Stock, or the right to purchase Restricted Stock, to any
Service Provider, subject to the right of the Company to repurchase all or part of such shares at their issue price or other stated or formula price from the Participant (or to require forfeiture of such shares if issued at no cost) in the event
that conditions specified by the Administrator in the applicable Award Agreement are not satisfied prior to the end of the applicable restriction period or periods established by the Administrator for such Award. In addition, the Administrator
may grant to Service Providers Restricted Stock Units, which may be subject to vesting and forfeiture conditions during applicable restriction period or periods, as set forth in an applicable Award Agreement. 

(b)     Terms and Conditions for All Restricted Stock and Restricted Stock Unit Awards. The Administrator
shall determine and set forth in the applicable Award Agreement the terms and conditions applicable to each Restricted Stock and Restricted Stock Unit Award, including the conditions for vesting and repurchase (or forfeiture) and the issue price, in
each case, if any.
 (c)    Additional Provisions Relating to Restricted Stock.

(i)    Dividends. Participants holding shares of Restricted Stock will be entitled to all
ordinary cash dividends paid with respect to such shares to the extent such dividends have a record date that is on or after the date on which the Participant to whom such Restricted Shares are granted becomes the record holder of such Restricted
Shares, unless otherwise provided by the Administrator in the applicable Award Agreement. In addition, unless otherwise provided by the Administrator, if any dividends or distributions are paid in shares, or consist of a dividend or
distribution to holders of Common Stock of property other than an ordinary cash dividend, the shares or other property will be subject to the same restrictions on transferability and forfeitability as the shares of Restricted Stock with respect to
which they were paid. Each dividend payment will be made as provided in the applicable Award Agreement, but in no event later than the end of the calendar year in which the dividends are paid to stockholders of that class of stock or, if later, the
15th day of the third month following the later of (A) the date the dividends are paid to stockholders of that class of stock, and (B) the date the dividends are no longer subject to forfeiture.

(ii)    Stock Certificates. The Company may require that any stock certificates issued in
respect of shares of Restricted Stock be deposited in escrow by the Participant, together with a stock power endorsed in blank, with the Company (or its designee).

(d)    Additional Provisions Relating to Restricted Stock Units. 

(i)    Settlement. Upon the vesting of a Restricted Stock Unit, the Participant shall be
entitled to receive from the Company one share of Common Stock or an amount of cash or other property equal to the Fair Market Value of one share of Common Stock on the settlement date, as the Administrator shall determine and as provided in the
applicable Award Agreement. The Administrator may provide that settlement of Restricted Stock Units shall occur upon or as soon as reasonably practicable after the vesting of the Restricted Stock Units or shall instead be deferred, on a
mandatory basis or at the election of the Participant, in a manner that complies with Section 409A.

  
 4 

 (ii)    Voting Rights. A Participant shall
have no voting rights with respect to any Restricted Stock Units unless and until shares are delivered in settlement thereof.

(iii)    Dividend Equivalents. To the extent provided by the Administrator, a grant of
Restricted Stock Units may provide a Participant with the right to receive Dividend Equivalents. Dividend Equivalents may be paid currently or credited to an account for the Participant, may be settled in cash and/or shares of Common Stock and
may be subject to the same restrictions on transfer and forfeitability as the Restricted Stock Units with respect to which the Dividend Equivalents are paid, as determined by the Administrator, subject, in each case, to such terms and conditions as
the Administrator shall establish and set forth in the applicable Award Agreement. 
 7.    Other
Stock-Based Awards.  
 Other Stock-Based Awards may be granted hereunder to Participants, including,
without limitation, Awards entitling Participants to receive shares of Common Stock to be delivered in the future. Such Other Stock-Based Awards shall also be available as a form of payment in the settlement of other Awards granted under the Plan,
as stand-alone payments and/or as payment in lieu of compensation to which a Participant is otherwise entitled. Other Stock-Based Awards may be paid in shares of Common Stock, cash or other property, as the Administrator shall
determine. Subject to the provisions of the Plan, the Administrator shall determine the terms and conditions of each Other Stock-Based Award, including any purchase price, transfer restrictions, vesting conditions and other terms and conditions
applicable thereto, which shall be set forth in the applicable Award Agreement. 
 8.    Adjustments for Changes
in Common Stock and Certain Other Events. 
 (a)    In the event that the Administrator determines that
any dividend or other distribution (whether in the form of cash, Common Stock, other securities, or other property), reorganization, merger, consolidation, combination, repurchase, recapitalization, liquidation, dissolution, or sale, transfer,
exchange or other disposition of assets of the Company, or exchange of Common Stock or other securities of the Company, issuance of warrants or other rights to purchase Common Stock or other securities of the Company, or other similar corporate
transaction or event, as determined by the Administrator, affects the Common Stock 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 Award, then the Administrator may, in such manner as it may deem equitable, adjust any or all of: 

(i)    the number and kind of shares of Common Stock (or other securities or property) with respect to
which Awards may be granted or awarded (including, but not limited to, adjustments of the limitations in Section 4 hereof on the maximum number and kind of shares which may be issued); 

(ii)    the number and kind of shares of Common Stock (or other securities or property) subject to
outstanding Awards; 
 (iii)    the grant or exercise price with respect to any Award; and 

(iv)    the terms and conditions of any Awards (including, without limitation, any applicable financial or
other performance “targets” specified in an Award Agreement). 
 (b)    In the event of any transaction or
event described in Section 8(a) hereof (including without limitation any Change in Control) or any unusual or nonrecurring transaction or event 

  
 5 

 
affecting the Company or the financial statements or financial condition of the Company, or any change in any Applicable Laws or accounting principles, the Administrator, on such terms and
conditions as it deems appropriate, either by the terms of the Award or by action taken prior to or after the occurrence of such transaction or event and either automatically or upon the Participant’s request, 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 (i) 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 Award granted or issued under the Plan, (ii) to facilitate such transaction or event or (iii) give effect to such changes in Applicable Laws or accounting principles:  

(i)    To provide for the cancellation of any such Award in exchange for either an amount of cash or other
property with a value equal to the amount that could have been obtained upon the exercise or settlement of such Award or realization of the Participant’s rights had such Award been currently exercisable, payable and fully vested, as applicable;
provided that, if the amount that could have been obtained upon the exercise or settlement of such Award or realization of the Participant’s rights, in any case, is equal to or less than zero, then such Award may be terminated without payment;

 (ii)    To provide that such Award shall vest and, to the extent applicable, be exercisable as to all
shares covered thereby, notwithstanding anything to the contrary in the Plan or the provisions of such Award; 

(iii)    To provide that such Award be assumed by the successor or survivor corporation, or a parent or
subsidiary thereof, or shall be substituted for by awards 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 applicable exercise or
purchase price, in all cases, as determined by the Administrator; 
 (iv)    To make adjustments in the
number and type of shares of Common Stock (or other securities or property) subject to outstanding Awards, and/or in the terms and conditions of (including the grant or exercise price), and the criteria included in, outstanding Awards which may be
granted in the future; 
 (v)    To replace such Award with other rights or property selected by the
Administrator; and/or 
 (vi)    To provide that the Award will terminate and cannot vest, be exercised
or become payable after the applicable event. 
 (c)    Notwithstanding the provisions of Section 8(b) above, if a
Change in Control occurs and a Participant’s Awards are not continued, converted, assumed, or replaced with a substantially similar award by (i) the Company, or (ii) a successor entity or its parent or subsidiary (an
“Assumption”), and provided that the Participant has not had a Termination of Service, then, immediately prior to the Change in Control, such Awards shall become fully vested, exercisable and/or payable, as applicable, and
all forfeiture, repurchase and other restrictions on such Awards shall lapse, in which case, such Awards shall be canceled upon the consummation of the Change in Control in exchange for the right to receive the Change in Control consideration
payable to other holders of Common Stock (A) which may be on such terms and conditions as apply generally to holders of Common Stock under the Change in Control documents (including, without limitation, any escrow, earn-out or other deferred consideration provisions) or such other terms and conditions as the Administrator may provide, and (B) determined by reference to the number of shares subject to such Awards and net
of any applicable exercise price; provided that to the extent that any Awards constitute “nonqualified deferred compensation” that may not 

  
 6 

 
be paid upon the Change in Control under Section 409A without the imposition of taxes thereon under Section 409A, the timing of such payments shall be governed by the applicable Award
Agreement (subject to any deferred consideration provisions applicable under the Change in Control documents); and provided, further, that if the amount to which a Participant would be entitled upon the settlement or exercise of such Award at the
time of the Change in Control is equal to or less than zero, then such Award may be terminated without payment. The Administrator shall determine whether an Assumption of an Award has occurred in connection with a Change in Control. 

(d)    In connection with the occurrence of any Equity Restructuring, and notwithstanding anything to the contrary in this
Section 8, the Administrator will equitably adjust each outstanding Award, which adjustments may include adjustments to the number and type of securities subject to each outstanding Award and/or the exercise price or grant price thereof, if
applicable, the grant of new Awards to Participants, and/or the making of a cash payment to Participants, as the Administrator deems appropriate to reflect such Equity Restructuring. The adjustments provided under this Section 8(d) shall be
nondiscretionary and shall be final and binding on the affected Participant and the Company; provided that whether an adjustment is equitable shall be determined by the Administrator. 

(e)    In the event of any pending stock dividend, stock split, combination or exchange of shares, merger, consolidation
or other distribution (other than normal cash dividends) of Company assets to stockholders, or any other change affecting the shares of Common Stock or the share price of the Common Stock, including any Equity Restructuring, or if necessary to
comply with Applicable Laws or the Code, or for reasons of administrative convenience, the Administrator may, in its sole discretion, refuse to permit the exercise of any Award during a period of up to thirty days prior to the consummation of any
such transaction. 
 (f)    Except as expressly provided in the Plan or pursuant to action of the Administrator under
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 of Common Stock subject to an Award or the grant or exercise price of any Award. The
existence of the Plan, any Award Agreements and the Awards granted hereunder shall not affect or restrict in any way the right or power of the Company to make or authorize (i) any adjustment, recapitalization, reorganization or other change in
the Company’s capital structure or its business, (ii) any merger, consolidation dissolution or liquidation of the Company or sale of Company assets or (iii) any sale or issuance of securities, including without limitation, securities
with rights superior to those of the Common Stock or which are convertible into or exchangeable for Common Stock. The Administrator may treat Participants and Awards (or portions thereof) differently under this Section 8. 

9.    General Provisions Applicable to Awards.  

(a)    Transferability of Awards. Except as the Administrator may otherwise determine or provide in an Award
Agreement or otherwise, in any case in accordance with Applicable Laws, Awards, including any interest therein, may not be sold, assigned, transferred, pledged or otherwise encumbered by the person to whom they are granted, either voluntarily or by
operation of law, except by will or the laws of descent and distribution, and, during the life of the Participant, shall be exercisable only by the Participant. References to a Participant, to the extent relevant in the context, shall include
references to authorized transferees. 

  
 7 

 (b)    Documentation. Each Award shall be evidenced in an Award
Agreement, which may be in such form (written, electronic or otherwise) as the Administrator shall determine. Each Award may contain terms and conditions in addition to those set forth in the Plan. 

(c)    Discretion. Except as otherwise provided by the Plan, each Award may be made alone or in addition or in
relation to any other Award. The terms of each Award to a Participant need not be identical, and the Administrator need not treat Participants or Awards (or portions thereof) uniformly. 

(d)    Termination of Status. The Administrator shall determine the effect on an Award of the disability, death,
retirement, authorized leave of absence or any other change or purported change in a Participant’s Service Provider status and the extent to which, and the period during which, the Participant, the Participant’s legal representative,
conservator, guardian or Designated Beneficiary may exercise rights under the Award, if applicable. 

(e)    Withholding. Each Participant shall pay to the Company, or make provision satisfactory to the Administrator
for payment of, any taxes required by law to be withheld in connection with Awards to such Participant no later than the date of the event creating the tax liability. The Company may deduct an amount sufficient to satisfy such tax obligations based
on the applicable statutory withholding rates (or such other rate as may be determined by the Company after considering any accounting consequences or costs) from any payment of any kind otherwise due to a Participant. In the absence of a contrary
determination by the Company (or, with respect to withholding pursuant to clause (ii) below with respect to Awards held by individuals subject to Section 16 of the Exchange Act, a contrary determination by the Administrator), all tax
withholding obligations will be calculated based on the minimum applicable statutory withholding rates. Subject to Section 10(h), any Company insider trading policy (including blackout periods) and Applicable Laws, Participants may satisfy such
tax obligations (i) in cash, by wire transfer of immediately available funds, by check made payable to the order of the Company, provided that the Company may limit the use of the foregoing payment forms if one or more of the payment forms
below is permitted, (ii) to the extent permitted by the Administrator, in whole or in part by delivery of shares of Common Stock, including shares delivered by attestation and shares retained from the Award creating the tax obligation, valued
at their Fair Market Value on the date of delivery, (iii) if there is a public market for shares of Common Stock at the time the tax obligations are satisfied, unless the Company otherwise determines, (A) delivery (including electronically
or telephonically to the extent permitted by the Company) of an irrevocable and unconditional undertaking by a broker acceptable to the Company to deliver promptly to the Company sufficient funds to satisfy the tax obligations, or (B) delivery
by the Participant to the Company of a copy of irrevocable and unconditional instructions to a broker acceptable to the Company to deliver promptly to the Company cash or a check sufficient to satisfy the tax withholding; provided that such amount
is paid to the Company at such time as may be required by the Administrator, or (iv) to the extent permitted by the Company, any combination of the foregoing payment forms approved by the Administrator. Notwithstanding any other provision of
the Plan, the number of shares of Common Stock which may be so withheld or surrendered pursuant to clause (ii) of the immediately preceding sentence shall be limited to the number of shares of Common Stock which have a Fair Market Value on the
date of withholding or surrender no greater than the aggregate amount of such liabilities based on the maximum individual statutory tax rate in the applicable jurisdiction at the time of such withholding (or such other rate as may be required to
avoid the liability classification of the applicable award under generally accepted accounting principles in the United States of America)); provided, however, that, any such shares of Common Stock delivered or retained shall be rounded up to the
nearest whole share to the extent rounding up to the nearest whole share does not result in the liability classification of the applicable Award under generally accepted accounting principles in the United States of America. If any tax withholding
obligation will be satisfied under clause (ii) above by the Company’s retention of shares of 

  
 8 

 
Common Stock from the Award creating the tax obligation and there is a public market for the shares of Common Stock at the time the tax obligation is satisfied, the Company may elect to instruct
any brokerage firm determined acceptable to the Company for such purpose to sell on the applicable Participant’s behalf some or all of the shares of Common Stock retained and to remit the proceeds of the sale to the Company or its designee, and
each Participant’s acceptance of an Award under the Plan will constitute the Participant’s authorization to the Company and instruction and authorization to such brokerage firm to complete the transactions described in this sentence. 

(f)    Amendment of Award; Repricing. The Administrator may amend, modify or terminate any outstanding Award,
including but not limited to, substituting therefor another Award of the same or a different type, changing the date of exercise or settlement, and converting an Incentive Stock Option to a Non-Qualified Stock
Option. The Participant’s consent to such action shall be required unless (i) the Administrator determines that the action, taking into account any related action, would not materially and adversely affect the Participant, or (ii) the
change is permitted under Section 8 and 10(f) hereof. Notwithstanding the foregoing or anything in the Plan to the contrary, the Administrator may, without the approval of the stockholders of the Company, reduce the exercise price per share of
outstanding Options or Stock Appreciation Rights or cancel outstanding Options or Stock Appreciation Rights in exchange for cash, other Awards or Options or Stock Appreciation Rights with an exercise price per share that is less than the exercise
price per share of the original Options or Stock Appreciation Rights; provided the exercise price per share of such Options or Stock Appreciation Rights is no less than 100% of the Fair Market Value on the date of such action. 

(g)    Conditions on Delivery of Stock. The Company will not be obligated to deliver any shares of Common Stock
pursuant to the Plan or to remove restrictions from shares previously delivered under the Plan until (i) all conditions of the Award have been met or removed to the satisfaction of the Company, (ii) in the opinion of the Company’s
counsel, all other legal matters in connection with the issuance and delivery of such shares have been satisfied, including any applicable securities laws and any applicable stock exchange or stock market rules and regulations, and (iii) the
Participant has executed and delivered to the Company such representations or agreements as the Administrator deems necessary or appropriate to satisfy the requirements of any Applicable Laws. The inability of the Company to obtain authority from
any regulatory body having jurisdiction, which authority is determined by the Administrator to be necessary to the lawful issuance and sale of any securities hereunder, shall relieve the Company of any liability in respect of the failure to issue or
sell such shares as to which such requisite authority shall not have been obtained. 
 (h)    Acceleration. The
Administrator may at any time provide that any Award shall become vested and/or exercisable in full or in part, free of some or all restrictions or conditions, or otherwise realizable in full or in part, as the case may be. 

10.    Miscellaneous.  

(a)    No Right To Employment or Other Status. No person shall have any claim or right to be granted an Award, and
the grant of an Award shall not be construed as giving a Participant the right to continued employment or any other relationship with the Company. The Company expressly reserves the right at any time to dismiss or otherwise terminate its
relationship with a Participant free from any liability or claim under the Plan or any Award, except as expressly provided in an applicable Award Agreement. 

(b)    No Rights As Stockholder; Certificates. Subject to the provisions of the applicable Award Agreement, no
Participant or Designated Beneficiary shall have any rights as a stockholder with respect to any shares of Common Stock to be distributed with respect to an Award until becoming the record holder of such shares. Notwithstanding any other provision
of the Plan, unless 

  
 9 

 
otherwise determined by the Administrator or required by any Applicable Laws, the Company shall not be required to deliver to any Participant certificates evidencing shares of Common Stock issued
in connection with any Award and instead such shares of Common Stock may be recorded in the books of the Company (or, as applicable, its transfer agent or stock plan administrator). The Company may place legends on stock certificates issued under
the Plan deemed necessary or appropriate by the Administrator in order to comply with Applicable Laws. 

(c)    Effective Date and Term of Plan. The Plan shall become effective on the date on which it is adopted by the
Board. No Awards shall be granted under the Plan after the completion of ten years from the earlier of (i) the date on which the Plan was adopted by the Board or (ii) the date the Plan was approved by the Company’s stockholders, but
Awards previously granted may extend beyond that date in accordance with the terms of the Plan. 
 (d)    Amendment
of Plan. The Administrator may amend, suspend or terminate the Plan or any portion thereof at any time; provided that no amendment of the Plan shall materially and adversely affect (as determined by the Administrator) any Award outstanding at
the time of such amendment without the consent of the affected Participant. Awards outstanding under the Plan at the time of any suspension or termination of the Plan shall continue to be governed in accordance with the terms of the Plan and the
applicable Award Agreement, as in effect prior to such suspension or termination. The Board shall obtain stockholder approval of any Plan amendment to the extent necessary to comply with Applicable Laws. 

(e)    Provisions for Foreign Participants. The Administrator may modify Awards granted to Participants who
are foreign nationals or employed outside the United States or establish subplans or procedures under the Plan to address differences in laws, rules, regulations or customs of such foreign jurisdictions with respect to tax, securities, currency,
employee benefit or other matters. 
 (f)    Section 409A.

(i)    General. The Company intends that all Awards be structured in compliance with, or to satisfy
an exemption from, Section 409A, such that no adverse tax consequences, interest, or penalties under Section 409A apply in connection with any Awards. Notwithstanding anything herein or in any Award Agreement to the contrary, the
Administrator may, without a Participant’s prior consent, amend this Plan and/or Awards, adopt policies and procedures, or take any other actions (including amendments, policies, procedures and actions with retroactive effect) as are necessary
or appropriate to preserve the intended tax treatment of Awards under the Plan, including without limitation, any such actions intended to (A) exempt this Plan and/or any Award from the application of Section 409A, and/or (B) comply
with the requirements of Section 409A, including without limitation any such regulations, guidance, compliance programs and other interpretative authority that may be issued after the date of grant of any Award. The Company makes no
representations or warranties as to the tax treatment of any Award under Section 409A or otherwise. The Company shall have no obligation under this Section 10(f) or otherwise to take any action (whether or not described herein) to avoid
the imposition of taxes, penalties or interest under Section 409A with respect to any Award and shall have no liability to any Participant or any other person if any Award, compensation or other benefits under the Plan are determined to
constitute non-compliant, “nonqualified deferred compensation” subject to the imposition of taxes, penalties and/or interest under Section 409A. 

(ii)    Separation from Service. With respect to any Award that constitutes “nonqualified
deferred compensation” under Section 409A, any payment or settlement of such Award that is to be made upon a termination of a Participant’s Service Provider relationship shall, to the extent necessary to avoid the imposition of taxes
under Section 409A, be made only upon 

  
 10 

 
the Participant’s “separation from service” (within the meaning of Section 409A), whether such “separation from service” occurs upon or subsequent to the termination
of the Participant’s Service Provider relationship. For purposes of any such provision of this Plan or any Award Agreement relating to any such payments or benefits, references to a “termination,” “termination of employment”
or like terms shall mean “separation from service.” 
 (iii)    Payments to Specified
Employees. Notwithstanding any contrary provision in the Plan or any Award Agreement, any payment(s) of “nonqualified deferred compensation” that are otherwise required to be made under an Award to a “specified employee” (as
defined under Section 409A and determined by the Administrator) as a result of his or her “separation from service” shall, to the extent necessary to avoid the imposition of taxes under Code Section 409A(a)(2)(B)(i), be delayed
until the expiration of the six-month period immediately following such “separation from service” (or, if earlier, until the date of death of the specified employee) and shall instead be paid (in a
manner set forth in the Award agreement) on the day that immediately follows the end of such six-month period or as soon as administratively practicable thereafter (without interest). Any payments of
“nonqualified deferred compensation” under such Award that are, by their terms, payable more than six months following the Participant’s “separation from service” shall be paid at the time or times such payments are
otherwise scheduled to be made. 
 (g)    Limitations on Liability. Notwithstanding any other provisions of
the Plan, no individual acting as a director, officer, other employee or agent of the Company will be liable to any Participant, former Participant, spouse, beneficiary, or any other person for any claim, loss, liability, or expense incurred in
connection with the Plan or any Award, nor will such individual be personally liable with respect to the Plan because of any contract or other instrument he or she executes in his or her capacity as an Administrator, director, officer, other
employee or agent of the Company. The Company will indemnify and hold harmless each director, officer, other employee and agent of the Company to whom any duty or power relating to the administration or interpretation of the Plan has been or
will be granted or delegated, against any cost or expense (including attorneys’ fees) or liability (including any sum paid in settlement of a claim with the Administrator’s approval) arising out of any act or omission to act concerning
this Plan unless arising out of such person’s own fraud or bad faith.

(h)    Lock-Up Period. The Company may, at the request of any
representative of the underwriters or otherwise, in connection with any registration of the offering of any securities of the Company under the Securities Act, prohibit Participants from, directly or indirectly, selling or otherwise transferring any
shares of Common Stock or other securities of the Company during a period of up to one hundred eighty days following the effective date of a registration statement of the Company filed under the Securities Act. 

(i)    Right of First Refusal. 

(i)    Before any shares of Common Stock held by a Participant or any permitted transferee (each, a
“Holder”) may be sold, pledged, assigned, hypothecated, transferred, or otherwise disposed of (each, a “Transfer”), the Company or its assignee(s) shall have a right of first refusal to purchase the
shares of Common Stock proposed to be Transferred on the terms and conditions set forth in this Section 10(i) (the “Right of First Refusal”). In the event that the Company’s charter, bylaws and/or a
stockholders’ agreement applicable to the shares of Common Stock contain a right of first refusal with respect to the shares of Common Stock, such right of first refusal shall apply to the shares of Common Stock to the extent such provisions
are more restrictive than the Right of First Refusal set forth in this Section 10(i) and 

  
 11 

 
the Right of First Refusal set forth in this Section 10(i) shall not in any way restrict the operation of the Company’s charter, bylaws or the operation of any applicable
stockholders’ agreement. 
 (ii)    In the event any Holder desires to Transfer any shares of Common
Stock, the Holder shall deliver to the Company a written notice (the “Notice”) stating: (A) the Holder’s bona fide intention to sell or otherwise Transfer such shares of Common Stock; (B) the name of each
proposed purchaser or other transferee (“Proposed Transferee”); (C) the number of shares of Common Stock to be Transferred to each Proposed Transferee; and (D) the price for which the Holder proposes to Transfer the
shares of Common Stock (the “Offered Price”), and the Holder shall offer such shares of Common Stock at the Offered Price to the Company or its assignee(s). 

(iii)    Within twenty-five days after receipt of the Notice, the Company and/or its assignee(s) may elect
in writing to purchase all, but not less than all, of the shares of Common Stock proposed to be Transferred to any one or more of the Proposed Transferees by delivery of a written exercise notice to the Holder (a “Company
Notice”). The purchase price (“Purchase Price”) for the shares of Common Stock repurchased under this Section 10(i) shall be the Offered Price. 

(iv)    Payment of the Purchase Price shall be made, at the option of the Company or its assignee(s), in
cash (by check or wire transfer), by cancellation of all or a portion of any outstanding indebtedness of the Holder to the Company (or, in the case of repurchase by an assignee, to the assignee), or by any combination thereof, within five days after
delivery of the Company Notice or in the manner and at the times mutually agreed to by the Company and the Holder. Should the Offered Price specified in the Notice be payable in property other than cash, the Company or its assignee shall have the
right to pay the purchase price in the form of cash equal in amount to the value of such property, as determined by the Administrator. 

(v)    If all or a portion of the shares of Common Stock proposed in the Notice to be Transferred are not
purchased by the Company and/or its assignee(s) as provided in this Section 10(i), then the Holder may sell or otherwise Transfer such shares of Common Stock to that Proposed Transferee at the Offered Price or at a higher price; provided that
such sale or other Transfer is consummated within sixty days after the date of the Notice; and provided, further, that any such sale or other Transfer is effected in accordance with any Applicable Laws and the Proposed Transferee agrees in writing
that the provisions of this Plan and the applicable Award Agreement and any other applicable agreements governing the shares of Common Stock to be Transferred shall continue to apply to the shares of Common Stock in the hands of such Proposed
Transferee. If the shares of Common Stock described in the Notice are not Transferred to the Proposed Transferee within such sixty-day period, a new Notice shall be given to the Company, and the Company and/or
its assignees shall again be offered the Right of First Refusal, as provided herein, before any shares of Common Stock held by the Holder may be sold or otherwise Transferred. 

(vi)    Anything to the contrary contained in this Section 10(i) notwithstanding and to the extent
permitted by the Administrator, the Transfer of any or all of the shares of Common Stock during a Participant’s lifetime or upon a Participant’s death by will or intestacy to the Participant’s Immediate Family or a trust for the
benefit of the Participant’s Immediate Family shall be exempt from the Right of First Refusal. As used herein, “Immediate Family” shall mean spouse, lineal descendant or antecedent, father, mother, brother or sister or
stepchild (whether or not adopted). In such case, the transferee or other recipient shall receive and hold the shares of Common Stock so Transferred subject to the provisions of this Plan (including the Right of First Refusal), the applicable Award
Agreement and any other applicable agreements governing the shares of Common Stock to be Transferred, and there shall be no further Transfer 

  
 12 

 
of such shares of Common Stock except in accordance with the terms of this Section 10(i) (or otherwise as expressly provided under the Plan). 

(vii)    The Right of First Refusal shall terminate as to all shares of Common Stock if the Company becomes
a Publicly Listed Company upon such occurrence. 
 (j)    Data Privacy. As a condition of receipt of any Award,
each Participant explicitly and unambiguously consents to the collection, use and transfer, in electronic or other form, of personal data as described in this paragraph by and among, as applicable, the Company and its subsidiaries and affiliates for
the exclusive purpose of implementing, administering and managing the Participant’s participation in the Plan. The Company and its subsidiaries and affiliates may hold certain personal information about a Participant, including but not limited
to, the Participant’s name, home address and telephone number, date of birth, social security or insurance number or other identification number, salary, nationality, job title(s), any shares of stock held in the Company or any of its
subsidiaries and affiliates, details of all Awards, in each case, for the purpose of implementing, managing and administering the Plan and Awards (the “Data”). The Company and its subsidiaries and affiliates may transfer the
Data amongst themselves as necessary for the purpose of implementation, administration and management of a Participant’s participation in the Plan, and the Company and its subsidiaries and affiliates may each further transfer the Data to any
third parties assisting the Company in the implementation, administration and management of the Plan. These recipients may be located in the Participant’s country, or elsewhere, and the Participant’s country may have different data privacy
laws and protections than the recipients’ country. Through acceptance of an Award, each Participant authorizes such recipients 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, including any requisite transfer of such Data as may be required to a broker or other third party with whom the Company or the Participant may elect to
deposit any shares of Common Stock. The Data related to a Participant will be held only as long as is necessary to implement, administer, and manage the Participant’s participation in the Plan. A Participant may, at any time, view the Data held
by the Company with respect to such Participant, request additional information about the storage and processing of the Data with respect to such Participant, recommend any necessary corrections to the Data with respect to the Participant or refuse
or withdraw the consents herein in writing, in any case without cost, by contacting his or her local human resources representative. The Company may cancel Participant’s ability to participate in the Plan and, in the Administrator’s
discretion, the Participant may forfeit any outstanding Awards if the Participant refuses or withdraws his or her consents as described herein. For more information on the consequences of refusal to consent or withdrawal of consent, Participants may
contact their local human resources representative. 
 (k)    Severability. In the event any portion of the Plan
or any action taken pursuant thereto shall be held illegal or invalid for any reason, the illegality or invalidity shall not affect the remaining parts of the Plan, and the Plan shall be construed and enforced as if the illegal or invalid provisions
had not been included, and the illegal or invalid action shall be null and void. 
 (l)    Governing Documents.
In the event of any contradiction between the Plan and any Award Agreement or any other written agreement between a Participant and the Company or any Subsidiary of the Company that has been approved by the Administrator, the terms of the Plan shall
govern, unless it is expressly specified in such Award Agreement or other written document that a specific provision of the Plan shall not apply. 

(m)    Governing Law. The provisions of the Plan and all Awards made hereunder shall be governed by and
interpreted in accordance with the laws of the State of Delaware, disregarding choice-of-law principles of the law of any state that would require the application of the
laws of a jurisdiction other than such state. 

  
 13 

 (n)    Submission to Jurisdiction; Waiver of Jury Trial. By
accepting an Award, each Participant irrevocably and unconditionally consents to submit to the exclusive jurisdiction of the courts of the State of Delaware and of the United States of America, in each case located in the State of Delaware, for any
action arising out of or relating to the Plan (and agrees not to commence any litigation relating thereto except in such courts), and further agrees that service of any process, summons, notice or document by U.S. registered mail to the address
contained in the records of the Company shall be effective service of process for any litigation brought against it in any such court. By accepting an Award, each Participant irrevocably and unconditionally waives any objection to the laying of
venue of any litigation arising out of Plan or Award hereunder in the courts of the State of Delaware or the United States of America, in each case located in the State of Delaware, and further irrevocably and unconditionally waives and agrees not
to plead or claim in any such court that any such litigation brought in any such court has been brought in an inconvenient forum. By accepting an Award, each Participant irrevocably and unconditionally waives, to the fullest extent permitted by
applicable law, any and all rights to trial by jury in connection with any litigation arising out of or relating to the Plan or any Award hereunder. 

(o)    Restrictions on Shares; Claw-Back Provisions. Awards and shares of Common Stock acquired in respect of
Awards shall be subject to such terms and conditions as the Administrator shall determine, including, without limitation, restrictions on the transferability of shares of Common Stock, the right of the Company to repurchase shares of Common Stock,
the right of the Company to require that shares of Common Stock be transferred in the event of certain transactions, tag-along rights, bring-along rights, redemption and
co-sale rights and voting requirements. Such terms and conditions may be additional to those contained in the Plan and may, as determined by the Administrator, be contained in the applicable Award Agreement or
in an exercise notice, stockholders’ agreement or in such other agreement as the Administrator shall determine, in each case in a form determined by the Administrator. The issuance of such shares of Common Stock shall be conditioned on the
Participant’s consent to such terms and conditions and the Participant’s entering into such agreement or agreements. All Awards (including any proceeds, gains or other economic benefit actually or constructively received by Participant
upon any receipt or exercise of any Award or upon the receipt or resale of any shares of Common Stock underlying the Award) shall be subject to the provisions of any claw-back policy implemented by the Company, including, without limitation, any
claw-back policy adopted to comply with the requirements of the Dodd-Frank Wall Street Reform and Consumer Protection Act and any rules or regulations promulgated thereunder, to the extent set forth in such claw-back policy and/or in the applicable
Award Agreement. A Participant shall, as a condition to receiving an Award, agree to execute such further instruments and to take such further action as the Company requests to carry out the purposes and intent of the Plan and any Award, including,
without limitation, restrictions on the transferability of shares of Common Stock, the right of the Company to repurchase shares of Common Stock, the right of the Company to require that shares of Common Stock be transferred in the event of certain
transactions, tag-along rights, bring-along rights, redemption and co-sale rights and voting requirements in accordance with Section 10(o) of the Plan. 

(p)    Titles and Headings. The titles and headings of the Sections in the Plan are for convenience of reference
only and, in the event of any conflict, the text of the Plan, rather than such titles or headings, shall control. 

(q)    Conformity to Securities Laws. Participant acknowledges that the Plan is intended to conform to the extent
necessary with all provisions of the Securities Act and the Exchange Act and any and all regulations and rules promulgated by the Securities and Exchange Commission thereunder, and state securities laws and regulations. Notwithstanding anything
herein to the contrary, the Plan and all Awards granted hereunder shall be administered only in such a manner as to conform to such laws, rules and regulations. To the extent permitted by Applicable Laws, the Plan and all Award

  
 14 

 
Agreements shall be deemed amended to the extent necessary to conform to such laws, rules and regulations. 

11.    Definitions. As used in the Plan, the following words and phrases shall have the following
meanings: 
 (a)    “Administrator” means the Board or a Committee to the extent that the
Board’s powers or authority under the Plan have been delegated to such Committee. 
 (b)    “Applicable
Laws” 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 the Common Stock is listed or quoted and the applicable laws and rules of any foreign country or other jurisdiction where Awards are granted or issued under the Plan. 

(c)     “Award” means, individually or collectively, a grant under the Plan of Options,
Restricted Stock, Restricted Stock Units or Other Stock-Based Awards. 
 (d)    “Award
Agreement” means a written agreement evidencing an Award, which agreements may be in electronic medium and shall contain such terms and conditions with respect to an Award as the Administrator shall determine, consistent with and
subject to the terms and conditions of the Plan. 
 (e)    “Board” means the Board of
Directors of the Company. 
 (f)    “Cause,” with respect to a Participant, means
“Cause” (or any term of similar effect) as defined in such Participant’s employment agreement with the Company if such an agreement exists and contains a definition of Cause (or term of similar effect), or, if no such agreement exists
or such agreement does not contain a definition of Cause (or term of similar effect), then Cause shall include, but not be limited to: (i) the Participant’s unauthorized use or disclosure of confidential information or trade secrets of the
Company or any material breach of a written agreement between the Participant and the Company, including without limitation a material breach of any employment, confidentiality, non-compete, non-solicit or similar agreement; (ii) the Participant’s commission of, indictment for or the entry of a plea of guilty or nolo contendere by the Participant to, a felony under the laws of the
United States or any state thereof or any crime involving dishonesty or moral turpitude (or any similar crime in any jurisdiction outside the United States); (iii) the Participant’s gross negligence or willful misconduct or the
Participant’s willful or repeated failure or refusal to substantially perform assigned duties; (iv) any act of fraud, embezzlement, material misappropriation or dishonesty committed by the Participant against the Company; or (v) any
acts, omissions or statements by a Participant which the Company reasonably determines to be materially detrimental or damaging to the reputation, operations, prospects or business relations of the Company. 

(g)    “Change in Control” means (i) a merger or consolidation of the Company with or into
any other corporation or other entity or person, (ii) a sale, lease, exchange or other transfer in one transaction or a series of related transactions of all or substantially all of the Company’s assets, or (iii) any other
transaction, including the sale by the Company of new shares of its capital stock or a transfer of existing shares of capital stock of the Company, the result of which is that a third party that is not an affiliate of the Company or its stockholders
(or a group of third parties not affiliated with the Company or its stockholders) immediately prior to such transaction acquires or holds capital stock of the Company representing a majority of the Company’s outstanding voting power immediately
following such transaction; provided that the following events shall not constitute a “Change in Control”: (A) a transaction (other than a sale of all or substantially all of the Company’s assets) in which the holders of

  
 15 

 
the voting securities of the Company immediately prior to the merger or consolidation hold, directly or indirectly, at least a majority of the voting securities in the successor corporation or
its parent immediately after the merger or consolidation; (B) a sale, lease, exchange or other transaction in one transaction or a series of related transactions of all or substantially all of the Company’s assets to an affiliate of the
Company; (C) an initial public offering of any of the Company’s securities or any other transaction or series of related transactions principally for bona fide equity financing purposes; (D) a reincorporation of the Company solely to
change its jurisdiction; or (E) a transaction undertaken for the primary purpose of creating a holding company that will be owned in substantially the same proportion by the persons who held the Company’s securities immediately before such
transaction. Notwithstanding the foregoing, if a Change in Control would give rise to a payment or settlement event with respect to any Award that constitutes “nonqualified deferred compensation,” the transaction or event constituting the
Change in Control must also constitute a “change in control event” (as defined in Treasury Regulation §1.409A-3(i)(5)) in order to give rise to the payment or settlement event for such Award, to
the extent required by Section 409A. 
 (h)    “Code” means the Internal Revenue Code of
1986, as amended, and the regulations issued thereunder. 
 (i)    “Committee” means one or more
committees or subcommittees of the Board, which may be comprised of one or more directors and/or executive officers of the Company, in either case, to the extent permitted in accordance with Applicable Laws. 

(j)    “Common Stock” means the common stock of the Company.  

(k)    “Company” means HilleVax, Inc., a Delaware corporation, or any successor thereto. Except
where the context otherwise requires, the term “Company” includes any of the Company’s present or future parent or subsidiary corporations as defined in Sections 424(e) or (f) of the Code and any other business venture
(including, without limitation, joint venture or limited liability company) in which the Company has a significant interest, as determined by the Administrator. 

(l)    “Consultant” means any person, including any advisor, engaged by the Company or a
parent or subsidiary of the Company to render services to such entity if: (i) the consultant or adviser renders bona fide services to the Company; (ii) the services rendered by the consultant or advisor are not in connection with the offer
or sale of securities in a capital-raising transaction and do not directly or indirectly promote or maintain a market for the Company’s securities; and (iii) the consultant or advisor is a natural person, or such other advisor or
consultant as is approved by the Administrator. 
 (m)    “Designated Beneficiary” means
the beneficiary or beneficiaries designated, in a manner determined by the Administrator, by a Participant to receive amounts due or exercise rights of the Participant in the event of the Participant’s death or
incapacity    In the absence of an effective designation by a Participant, “Designated Beneficiary” shall mean the Participant’s estate. 

(n)    “Director” means a member of the Board. 

(o)    “Disability” means a permanent and total disability within the meaning of
Section 22(e)(3) of the Code, as it may be amended from time to time. 
 (p)    “Dividend
Equivalents” means a right granted to a Participant pursuant to Section 6(d)(3) hereof to receive the equivalent value (in cash or shares of Common Stock) of dividends paid on shares of Common Stock. 

  
 16 

 (q)    “Employee” means any person, including
officers and Directors, employed by the Company (within the meaning of Section 3401(c) of the Code) or any parent or subsidiary of the Company. 

(r)    “Equity Restructuring” means, as determined by the Administrator, a non-reciprocal transaction between the Company and its stockholders, such as a stock dividend, stock split, spin-off or recapitalization through a large, nonrecurring cash
dividend, that affects the shares of Common Stock (or other securities of the Company) or the share price of Common Stock (or other securities of the Company) and causes a change in the per share value of the Common Stock underlying outstanding
Awards. 
 (s)    “Exchange Act” means the Securities Exchange Act of 1934, as amended.

 (t)    “Fair Market Value” means, as of any date, the value of Stock determined as follows:
(i) if the Common Stock is listed on any established stock exchange, its Fair Market Value shall be the closing sales price for such Common Stock as quoted on such exchange for such date, or if no sale occurred on such date, the first market
trading day immediately prior to such date during which a sale occurred, as reported in The Wall Street Journal or such other source as the Administrator deems reliable; (ii) if the Common Stock is not traded on a stock exchange but is
quoted on a national market or other quotation system, the last sales price on such date, or if no sales occurred on such date, then on the date immediately prior to such date on which sales prices are reported, as reported in The Wall Street
Journal or such other source as the Administrator deems reliable; or (iii) in the absence of an established market for the Common Stock, the Fair Market Value thereof shall be determined by the Administrator. 

(u)    “Good Reason” with respect to a Participant, means “Good Reason” (or any term of
similar effect) as defined in such Participant’s employment or consulting agreement with the Company if such an agreement exists and contains a definition of Good Reason (or term of similar effect), or, if no such agreement exists or such
agreement does not contain a definition of Good Reason (or term of similar effect), then Good Reason shall mean the occurrence of any of the following circumstances without the Participant’s express prior written consent: (i) a material
diminution in the Particpant’s base compensation, unless reductions comparable in amount and duration are concurrently made for all other similarly-situated employees of the Company; or (ii) a relocation of the Participant’s place of
employment by more than 50 miles, provided that such change, reduction or relocation is effected by the Company (or its parent or subsidiary employing the Participant) without the Participant’s consent. Notwithstanding the foregoing, a
Participant may not resign his or her employment with Good Reason unless: (x) the Participant provides the Company with at least 30 days prior written notice of his or her intent to resign for Good Reason (which notice is provided not later
than 60 days following the occurrence of the event constituting Good Reason and contains reasonable detail regarding the basis for asserting Good Reason) and (y) the Company has not remedied the violation(s) within the 30 day period, and such
resignation must occur within 90 days of the end of such remedy period. 
 (v)    “Incentive Stock
Option” means an “incentive stock option” as defined in Section 422 of the Code. 

(w)    “Non-Qualified Stock Option” means an Option
that is not intended to be or otherwise does not qualify as an Incentive Stock Option. 

(x)    “Option” means an option to purchase Common Stock. 

(y)    “Other Stock-Based Awards” means other Awards of shares of Common Stock, and other Awards
that are valued in whole or in part by reference to, or are otherwise based on, shares of Common Stock or other property. 

  
 17 

 (z)    “Participant” means a Service
Provider who has been granted an Award under the Plan. 
 (aa)    “Plan” means this HilleVax,
Inc. 2021 Equity Incentive Plan. 
 (bb)    “Publicly Listed Company” means that the Company or
its successor (i) is required to file periodic reports pursuant to Section 12 of the Exchange Act and (ii) the Common Stock is listed on one or more National Securities Exchanges (within the meaning of the Exchange Act) or is quoted
on NASDAQ or a successor quotation system. 
 (cc)    “Restricted Stock” means Common Stock
awarded to a Participant pursuant to Section 6 hereof that is subject to certain vesting conditions and other restrictions. 

(dd)    “Restricted Stock Unit” means an unfunded, unsecured right to receive, on the applicable
settlement date, one share of Common Stock or an amount in cash or other consideration determined by the Administrator equal to the value thereof as of such payment date, which right may be subject to certain vesting conditions and other
restrictions. 
 (ee)    “Section 409A” means Section 409A
of the Code and all regulations, guidance, compliance programs and other interpretative authority thereunder. 

(ff)    “Securities Act” means the Securities Act of 1933, as amended from time to time. 

(gg)    “Service Provider” means an Employee, Consultant or Director. 

(hh)    “Termination of Service” means the date the Participant ceases to be a Service Provider.

  
 18 

 HILLEVAX, INC. 

2021 EQUITY INCENTIVE PLAN 

CALIFORNIA SUPPLEMENT 

The Administrator has adopted this supplement for purposes of satisfying the requirements of Section 25102(o) of the California
Corporations Code and the regulations issued thereunder (“Section 25102(o)”). Notwithstanding anything to the contrary contained in the Plan and except as otherwise determined by the
Administrator, the provisions set forth in this supplement shall apply to all Awards granted under the Plan to a Participant who is a resident of the State of California on the date of grant (a “California Participant”) and
which are intended to be exempt from registration in California pursuant to Section 25102(o). This supplement shall not apply to Awards granted to California Participants or after the date on which the Company becomes a Publicly Listed Company.
Definitions in the Plan are applicable to this supplement. 
 1.    Limitation on Securities Issuable under the
Plan. The amount of securities issued pursuant to the Plan shall not exceed the amounts permitted under section 260.140.45 of the California Code of Regulations to the extent applicable. 

2.    Additional Limitations On Options.  

(a)    Maximum Duration of Options. No Options granted to California Participants will be granted for a term in
excess of 10 years. 
 (b)    Minimum Exercise Period Following Termination. Unless a California
Participant’s Service Provider relationship is terminated for Cause, in the event of termination of such Participant’s Service Provider relationship, to the extent required by Applicable Laws, he or she shall have the right to exercise an
Option, to the extent that he or she was otherwise entitled to exercise such Option on the date employment terminated, as follows: (i) at least six months from the date of termination, if termination was caused by such Participant’s death
or Disability and (ii) at least 30 days from the date of termination, if termination was caused other than by such Participant’s death or Disability. 

3.    Additional Limitations For Restricted Stock Awards, Restricted Stock Units and Other Stock-Based
Awards. The terms of all Awards granted to California Participants shall comply, to the extent applicable, with Section 260.140.41 and Section 260.140.42 of the California Code of Regulations. 

4.    Adjustments. The Administrator will make such adjustments to an Award held by a California Participant
as may be required by Section 260.140.41 or Section 260.140.42 of the California Code of Regulations. 

5.    Additional Requirement To Provide Information To California Participants. To the extent
required by Section 260.140.46 of the California Code of Regulations, the Company shall provide to each California Participant and to each California Participant who acquires Common Stock pursuant to the Plan, not less frequently than annually,
copies of annual financial statements (which need not be audited). The Company shall not be required to provide such statements to key persons whose duties in connection with the Company assure their access to equivalent information. In addition,
this information requirement shall not apply to the Plan to the extent that it complies with all conditions of Rule 701 of the Securities Act (“Rule 701”) as determined by the Administrator; provided that for purposes of

  
 CS-1 

 
determining such compliance, any registered domestic partner shall be considered a “family member” as that term is defined in Rule 701. 

6.    Stockholder Approval; Additional Limitations On Timing Of Awards. The Plan will be
submitted for the approval of the Company’s stockholders within twelve (12) months after the date of the Board’s adoption of the Plan. Awards may be granted or awarded prior to such stockholder approval; provided that no Award granted
to a California Participant shall become exercisable, vested or realizable, as applicable to such Award, unless the Plan has been approved by the Company’s stockholders within twelve months before or after the date the Plan was adopted by
the Administrator; and provided, further, that if such approval has not been obtained at the end of said twelve-month period, all Awards previously granted or awarded under the Plan to California Participants shall thereupon be canceled and become
null and void. 

  
 CS-2 

 AMENDMENT NO. 1 

TO THE 
 HILLEVAX, INC.
2021 EQUITY INCENTIVE PLAN 
 THIS AMENDMENT NO. 1 TO THE HILLEVAX, INC. 2021 EQUITY INCENTIVE PLAN (this “Amendment”),
dated as of March 8, 2021, is made and adopted by HILLEVAX, INC., a Delaware corporation (the “Company”). Capitalized terms used but not otherwise defined herein shall have the meanings ascribed to them in the Plan (as defined
below). 
 RECITALS 

WHEREAS, the Company has adopted the HilleVax, Inc. 2021 Equity Incentive Plan (the “Plan”); 

WHEREAS, the Company desires to amend the Plan as set forth below; 

WHEREAS, pursuant to Section 10(d) of the Plan, the Plan may be amended by the Board of Directors of the Company; and 

WHEREAS, the Board of Directors of the Company has approved this Amendment pursuant to resolutions adopted on March 8, 2021. 

NOW, THEREFORE, in consideration of the foregoing, the Company hereby amends the Plan as follows: 

1.    The first sentence of Section 4(a) of the Plan is hereby amended to read as follows: 

“Subject to adjustment under Section 8 hereof, Awards may be made under the Plan covering up to 1,881,500 shares of
Common Stock.” 
 2.    This Amendment shall be and is hereby incorporated in and forms a part of the Plan. All
other terms and provisions of the Plan shall remain unchanged except as specifically modified herein. The Plan, as amended by this Amendment, is hereby ratified and confirmed. 

[REMAINDER OF PAGE LEFT INTENTIONALLY BLANK] 

 I hereby certify that the foregoing Amendment was duly adopted by the Board of Directors of
HilleVax, Inc. on March 8, 2021. 
  

			
	By:	 	 /s/ Robert Hershberg

	Name:	 	Robert Hershberg
	Title:	 	Chief Executive Officer

 AMENDMENT NO. 2 

TO THE 
 HILLEVAX, INC.
2021 EQUITY INCENTIVE PLAN 
 THIS AMENDMENT NO. 2 TO THE HILLEVAX, INC. 2021 EQUITY INCENTIVE PLAN (this “Amendment”),
dated as of April 19, 2021, is made and adopted by HILLEVAX, INC., a Delaware corporation (the “Company”). Capitalized terms used but not otherwise defined herein shall have the meanings ascribed to them in the Plan (as defined
below). 
 RECITALS 

WHEREAS, the Company has adopted the HilleVax, Inc. 2021 Equity Incentive Plan (the “Plan”); 

WHEREAS, the Company desires to amend the Plan as set forth below; 

WHEREAS, pursuant to Section 10(d) of the Plan, the Plan may be amended by the Board of Directors of the Company; and 

WHEREAS, the Board of Directors of the Company has approved this Amendment pursuant to resolutions adopted on April 19, 2021. 

NOW, THEREFORE, in consideration of the foregoing, the Company hereby amends the Plan as follows: 

1.    The first sentence of Section 4(a) of the Plan is hereby amended to read as follows: 

“Subject to adjustment under Section 8 hereof, Awards may be made under the Plan covering up to 1,836,500 shares of
Common Stock.” 
 2.    This Amendment shall be and is hereby incorporated in and forms a part of the Plan. All
other terms and provisions of the Plan shall remain unchanged except as specifically modified herein. The Plan, as amended by this Amendment, is hereby ratified and confirmed. 

[REMAINDER OF PAGE LEFT INTENTIONALLY BLANK] 

 I hereby certify that the foregoing Amendment was duly adopted by the Board of Directors of
HilleVax, Inc. on April 19, 2021. 
  

			
	By:	 	 /s/ Robert Hershberg

	Name:	 	Robert Hershberg
	Title:	 	Chief Executive Officer

 AMENDMENT NO. 3 

TO THE 
 HILLEVAX, INC.
2021 EQUITY INCENTIVE PLAN 
 THIS AMENDMENT NO. 3 TO THE HILLEVAX, INC. 2021 EQUITY INCENTIVE PLAN (this “Amendment”),
dated as of May 12, 2021, is made and adopted by HILLEVAX, INC., a Delaware corporation (the “Company”). Capitalized terms used but not otherwise defined herein shall have the meanings ascribed to them in the Plan (as defined
below). 
 RECITALS 

WHEREAS, the Company has adopted the HilleVax, Inc. 2021 Equity Incentive Plan (the “Plan”); 

WHEREAS, the Company desires to amend the Plan as set forth below; 

WHEREAS, pursuant to Section 10(d) of the Plan, the Plan may be amended by the Board of Directors of the Company; and 

WHEREAS, the Board of Directors of the Company has approved this Amendment pursuant to resolutions adopted on May 12, 2021. 

NOW, THEREFORE, in consideration of the foregoing, the Company hereby amends the Plan as follows: 

1.    The first sentence of Section 4(a) of the Plan is hereby amended to read as follows: 

“Subject to adjustment under Section 8 hereof, Awards may be made under the Plan covering up to 1,796,500 shares of
Common Stock.” 
 2.    This Amendment shall be and is hereby incorporated in and forms a part of the Plan. All
other terms and provisions of the Plan shall remain unchanged except as specifically modified herein. The Plan, as amended by this Amendment, is hereby ratified and confirmed. 

[REMAINDER OF PAGE LEFT INTENTIONALLY BLANK] 

 I hereby certify that the foregoing Amendment was duly adopted by the Board of Directors of
HilleVax, Inc. on May 12, 2021. 
  

			
	By:	 	 /s/ Robert Hershberg

	Name:	 	Robert Hershberg
	Title:	 	Chief Executive Officer

 AMENDMENT NO. 4 

TO THE 
 HILLEVAX, INC.
2021 EQUITY INCENTIVE PLAN 
 THIS AMENDMENT NO. 4 TO THE HILLEVAX, INC. 2021 EQUITY INCENTIVE PLAN (this “Amendment”),
dated as of July 2, 2021, is made and adopted by HILLEVAX, INC., a Delaware corporation (the “Company”). Capitalized terms used but not otherwise defined herein shall have the meanings ascribed to them in the Plan (as defined
below). 
 RECITALS 

WHEREAS, the Company has adopted the HilleVax, Inc. 2021 Equity Incentive Plan (the “Plan”); 

WHEREAS, the Company desires to amend the Plan as set forth below; 

WHEREAS, pursuant to Section 10(d) of the Plan, the Plan may be amended by the Board of Directors of the Company; and 

WHEREAS, the Board of Directors of the Company has approved this Amendment pursuant to resolutions adopted on July 2, 2021. 

NOW, THEREFORE, in consideration of the foregoing, the Company hereby amends the Plan as follows: 

1.    The first sentence of Section 4(a) of the Plan is hereby amended to read as follows: 

“Subject to adjustment under Section 8 hereof, Awards may be made under the Plan covering up to 1,766,500 shares of
Common Stock.” 
 2.    This Amendment shall be and is hereby incorporated in and forms a part of the Plan. All
other terms and provisions of the Plan shall remain unchanged except as specifically modified herein. The Plan, as amended by this Amendment, is hereby ratified and confirmed. 

[REMAINDER OF PAGE LEFT INTENTIONALLY BLANK] 

 I hereby certify that the foregoing Amendment was duly adopted by the Board of Directors of
HilleVax, Inc. on July 2, 2021. 
  

			
	By:	 	 /s/ Robert Hershberg

	Name:	 	Robert Hershberg
	Title:	 	Chief Executive Officer

 HILLEVAX, INC. 

2021 EQUITY INCENTIVE PLAN 

STOCK OPTION GRANT NOTICE AND 

STOCK OPTION AGREEMENT 

HilleVax, Inc. (the “Company”), pursuant to its 2021 Equity Incentive Plan (as amended from time to time, the
“Plan”), hereby grants to Participant an Option to purchase the number of shares of the Company’s Common Stock (referred to herein as “Shares”) set forth below. This Option is subject to all of
the terms and conditions as set forth herein and in the Stock Option Agreement attached hereto as Exhibit A (the “Agreement”) and the Plan, each of which is incorporated herein by reference. Unless otherwise defined
herein, the terms defined in the Plan shall have the same defined meanings in this Stock Option Grant Notice (“Grant Notice”) and the Agreement. 
  

			
	Participant:	  	[Insert Participant Name]
		
	Grant Date:	  	[Insert Grant Date]
		
	Vesting Commencement Date:	  	[Insert Vesting Commencement Date]
		
	Exercise Price per Share:	  	$[Insert Exercise Price Per Share]
		
	Total Exercise Price:	  	$[Insert Aggregate Exercise Price on Grant Date]
		
	Total Number of Shares Subject to Option:	  	[Insert Number of Shares]
		
	Expiration Date:	  	[Insert Tenth Anniversary of Grant Date]
		
	Type of Option:	  	☐  Incentive Stock Option    ☐  Non-Qualified Stock Option
		
	Vesting Schedule:	  	[25% of the total number of Shares subject to the Option shall vest one year after the Vesting Commencement Date, and 1/48th of the total number of Shares subject to the Option shall vest on the last day of each one-month period of Participant’s service as a Service Provider thereafter, so that all of the Shares subject to the Option shall be vested on the 4th
anniversary of the Vesting Commencement Date.]

 By his or her signature and the Company’s signature below, Participant agrees to be bound by the terms
and conditions of the Plan, the Agreement and this Grant Notice. Participant has reviewed the Agreement, the Plan and this Grant Notice in their entirety, has had an opportunity to obtain the advice of counsel prior to executing this Grant Notice
and fully understands all provisions of this Grant Notice, the Agreement and the Plan. Participant hereby agrees to accept as binding, conclusive and final all decisions or interpretations of the Administrator of the Plan upon any questions arising
under the Plan or the Agreement. 
  

									
	HILLEVAX, INC.	 		 	PARTICIPANT
					
	By:	 	
                     
                                       
	 		 	By:	 	
                     
                   

	Print Name:	 	  
	 		 	Print Name:	 	  

	Title:	 	  
	 		 	State of Residence:	 	  

 EXHIBIT A 

TO STOCK OPTION GRANT NOTICE 

STOCK OPTION AGREEMENT 

Pursuant to the Grant Notice to which this Agreement is attached, the Company has granted to Participant an Option under the Plan to purchase
the number of Shares indicated in the Grant Notice. 
 1.    Grant of Option. In consideration of
Participant’s past and/or continued employment with or service to the Company or a parent or subsidiary of the Company and for other good and valuable consideration, effective as of the Grant Date set forth in the Grant Notice, the Company
irrevocably grants to Participant an Option to purchase any part or all of an aggregate of the number of Shares set forth in the Grant Notice at the Exercise Price per Share set forth in the Grant Notice, upon the terms and conditions set forth in
the Plan and this Agreement. Unless designated as a Non-Qualified Stock Option in the Grant Notice, the Option shall be an Incentive Stock Option to the maximum extent permitted by law. 

2.    Vesting. The Option shall become vested and exercisable in such amounts and at such times as are set
forth in the vesting schedule in the Grant Notice (the “Vesting Schedule”), except that any Share as to which the Option would be fractionally vested will be accumulated and will vest and become exercisable only when a whole
Share has accumulated. The installments provided for in the vesting schedule are cumulative. Unless otherwise determined by the Administrator, any portion of the Option that has not become vested and exercisable on or prior to the date Participant
incurs a Termination of Service shall be forfeited on the date of Participant’s Termination of Service and shall not thereafter become vested, except as may be otherwise provided by the Administrator or as set forth in another written agreement
between the Company and Participant. 
 3.    Exercise. 

(a)    Duration of Exercisability. Any vested portion of the Option may be exercised in whole or in part at any time
prior to the time when the Option or portion thereof becomes unexercisable under Section 4. 
 (b)    Person
Eligible to Exercise. During the lifetime of Participant, only Participant may exercise the Option or any portion thereof. After the death of Participant, any exercisable portion of the Option may, prior to the time when the Option becomes
unexercisable under Section 4, be exercised by Participant’s personal representative or by any person empowered to do so under the deceased Participant’s will or under the then Applicable Laws of descent and distribution. 

(c)    Manner of Exercise. The Option, or any exercisable portion thereof, may be exercised solely by delivery to
the Secretary of the Company or the Secretary’s office, or such other place as may be determined by the Administrator, of all of the following prior to the time when the Option or such portion thereof becomes unexercisable under Section 4:

 (i)    An exercise notice in substantially in the form attached as Exhibit B to the Grant
Notice (or such other form as is prescribed by the Administrator, which may be an electronic form) (the “Exercise Notice”) signed by Participant or any other person then entitled to exercise the Option or portion thereof,
stating that the Option or portion thereof is thereby exercised, such Exercise Notice complying with all applicable rules established by the Administrator; and 

  
 A-1 

 (ii)     Subject to Section 5(f) of the Plan, full
payment for the Shares with respect to which the Option or portion thereof is exercised by: 

(A)    Cash, wire transfer of immediately available funds or check, payable to the order of the Company; or

 (B)    With the consent of the Administrator, surrendering shares of Common Stock then issuable upon
exercise of the Option valued at their Fair Market Value on the date of exercise; or 
 (C)    If the
Company is a Publicly Listed Company, unless the Administrator otherwise determines, through the (A) delivery of an irrevocable and unconditional undertaking by a broker acceptable to the Company to deliver promptly to the Company sufficient
funds to pay the exercise price, or (B) delivery by the Participant to the Company of a copy of irrevocable and unconditional instructions to a broker acceptable to the Company to deliver promptly to the Company cash or a check sufficient to
pay the exercise price, provided in either case, that such amount is paid to the Company at such time as may be required by the Administrator; or 

(D)    With the consent of the Administrator, any other form of payment permitted under Section 5(f)
of the Plan; or 
 (E)    Any combination of the above permitted forms of payment; and 

(iii)    Subject to Section 9(e) of the Plan, full payment for any applicable withholding taxes in
cash, by wire transfer of immediately available funds or by check or in any form of consideration permitted by the Administrator for the payment of the exercise price pursuant to Section 3(c)(ii) above or pursuant to Section 3(d) below;
and 
 (iv)    In the event the Option or portion thereof shall be exercised pursuant to
Section 3(b) by any person or persons other than Participant, appropriate proof of the right of such person or persons to exercise the Option. 

(d)    Tax Withholding. The Company shall have the authority and the right to deduct or withhold, or require
Participant to remit to the Company, an amount sufficient to satisfy federal, state, local and foreign taxes (including Participant’s employment tax obligation) required by Applicable Law to be withheld with respect to any taxable event
concerning Participant arising as a result of the Option or otherwise under this Agreement, including, without limitation, the authority to deduct such amounts from other compensation payable to Participant by the Company. 

(e)    Fractional Shares. The Option may only be exercised for whole shares of Common Stock. Any fractional Shares
shall be rounded down to the nearest whole share. 
 (f)    Special Tax Consequences. If the Option is intended
to be an Incentive Stock Option, Participant acknowledges that, to the extent that the aggregate fair market value (determined as of the time the Option is granted) of all Shares with respect to which Incentive Stock Options, including, without
limitation, the Option, are first exercisable for the first time by Participant in any calendar year exceeds $100,000 (or such other limitation as imposed by Section 422(d) of the Code), the Option and such other options (or the applicable
portion thereof) shall be treated as not qualifying under Section 

  
 A-2 

 
422 of the Code but rather shall be considered Non-Qualified Stock Options. Participant further acknowledges that the rule set forth in the preceding
sentence shall be applied by taking Options and other “incentive stock options” into account in the order in which they were granted. Participant acknowledges that amendments or modifications made to the Option pursuant to the Plan that
would cause the Option to become a Non-Qualified Stock Option will not materially or adversely affect Participant’s rights under the Option, and that any such amendment or modification shall not require
Participant’s consent. Participant also acknowledges that if the Option is exercised more than three months after Participant’s Termination of Service as an employee of the Company (or a “parent corporation” or “subsidiary
corporation” thereof within the meaning of Sections 424(e) or 424(f) of the Code, respectively), other than by reason of death or Disability, the Option will be taxed as a Non-Qualified Stock Option. 

4.    Expiration of Option. The Option may not be exercised to any extent by anyone after the first to occur
of the following events: 
 (a)    The Expiration Date set forth in the Grant Notice; 

(b)    If the Option is an Incentive Stock Option and Participant is an Employee who, at the time of grant of the Option,
owns (or is treated as owning under Section 424 of the Code) stock representing more than 10% of the voting power of all classes of stock of the Company (or a “parent corporation” or “subsidiary corporation” thereof within
the meaning of Sections 424(e) or 424(f) of the Code, respectively), the date that is five years following the Grant Date; 

(c)    The expiration of three months following the date of Participant’s Termination of Service, unless such
Termination of Service occurs by reason of Participant’s death or Disability or Participant’s discharge by the Company for Cause; 

(d)    The expiration of one year following the date of Participant’s Termination of Service by reason of
Participant’s death or Disability; 
 (e)    The date of Participant’s Termination of Service as a result of
Participant’s discharge by the Company for Cause; or 
 (f)    With respect to any unvested portion of the Option,
the date that is thirty days following Participant’s Termination of Service for any reason other than as a result of Participant’s discharge by the Company for Cause, or such shorter period as may be determined by the Administrator. 

5.    Transferability. The Option shall not be sold, assigned, transferred, pledged or otherwise encumbered
by Participant, either voluntarily or by operation of law, except by will or the laws of descent and distribution, and, during the life of the Participant, the Option shall be exercisable only by the Participant. 

6.    Restrictive Legends and Stop-Transfer Orders.

 (a)    Legends. Participant understands and agrees that the Company shall cause any certificates issued
evidencing the Shares to have the legends set forth below or legends substantially equivalent thereto, together with any other legends that may be required by Applicable Laws: 

THE SHARES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (“ACT”), NOR HAVE THEY BEEN
REGISTERED OR 

  
 A-3 

 
QUALIFIED UNDER THE SECURITIES LAWS OF ANY STATE. NO TRANSFER OF SUCH SECURITIES WILL BE PERMITTED UNLESS A REGISTRATION STATEMENT UNDER THE ACT IS IN EFFECT AS TO SUCH TRANSFER, THE TRANSFER IS
MADE IN ACCORDANCE WITH RULE 144 UNDER THE ACT, OR IN THE OPINION OF COUNSEL (WHICH MAY BE COUNSEL FOR THE COMPANY) REGISTRATION UNDER THE ACT IS UNNECESSARY IN ORDER FOR SUCH TRANSFER TO COMPLY WITH THE ACT AND WITH APPLICABLE STATE SECURITIES
LAWS. 
 THE SHARES REPRESENTED BY THIS CERTIFICATE MAY BE TRANSFERRED ONLY IN ACCORDANCE WITH THE TERMS OF AN AGREEMENT BETWEEN THE COMPANY
AND THE STOCKHOLDER, A COPY OF WHICH IS ON FILE WITH THE SECRETARY OF THE COMPANY. SUCH TRANSFER RESTRICTIONS ARE BINDING ON TRANSFEREES OF THESE SHARES. 

(b)    Stop Transfer Orders. Participant agrees that, in order to ensure compliance with the restrictions referred
to in the Plan and this Agreement, the Company may issue appropriate “stop transfer” instructions to its transfer agent, if any, and that, if the Company transfers its own securities, it may make appropriate notations to the same
effect in its own records. 
 (c)    Impermissible Transfers Void. The Company shall not be required (i) to
transfer on its books any Shares that have been sold or otherwise transferred in violation of any of the provisions of this Agreement or (ii) to treat as owner of such Shares or to accord the right to vote or pay dividends to any purchaser or
other transferee to whom such Shares shall have been so transferred. Any transfer or attempted transfer of the Option not in accordance with the terms of this Agreement shall be void. 

7.    Taxes. Participant understands that Participant may suffer adverse tax consequences as a result of
Participant’s purchase or disposition of the Shares. Participant represents that Participant has consulted with any tax consultants Participant deems advisable in connection with the purchase or disposition of the Shares and that Participant is
not relying on the Company for any tax advice. Participant is relying solely on such advisors and not on any statements or representations of the Company or any of its agents. Participant understands that Participant (and not the Company) shall be
responsible for Participant’s tax liability that may arise as a result of the transactions contemplated by this Agreement. 

8.    Miscellaneous. 

(a)    No Right To Employment or Other Status. No person shall have any claim or right to be granted an Award, and
the grant of an Award shall not be construed as giving a Participant the right to continued employment or any other relationship with the Company. The Company expressly reserves the right at any time to dismiss or otherwise terminate its
relationship with a Participant free from any liability or claim under the Plan or this Agreement. 

(b)    Notices. Any notice to be given under the terms of this Agreement to the Company shall be addressed to the
Company in care of the Secretary of the Company at the Company’s principal executive offices, and any notice to be given to Participant shall be addressed to Participant at the most-recent physical or email address for Participant listed in the
Company’s personnel records. By a 

  
 A-4 

 
notice given pursuant to this Section 8(b), either party may hereafter designate a different address for notices to be given to that party. Any notice which is required to be given to
Participant shall, if Participant is then deceased, be given to the person entitled to exercise his or her Option by written notice under this Section 8(b). Any notice shall be deemed duly given when sent via email or when sent by certified
mail (return receipt requested) and deposited (with postage prepaid) in a post office or branch post office regularly maintained by the United States Postal Service. 

(c)    Successors and Assigns. The Company may assign any of its rights under this Agreement and the Exercise
Notice to single or multiple assignees, and this Agreement shall inure to the benefit of the successors and assigns of the Company. Subject to the restrictions on transfer herein set forth, this Agreement shall be binding upon Participant and his or
her heirs, executors, administrators, successors and assigns. 
 (d)    Severability. In the event any portion of
the Plan or this Agreement or any action taken pursuant thereto shall be held illegal or invalid for any reason, the illegality or invalidity shall not affect the remaining parts of the Plan and this Agreement, and the Plan and this Agreement shall
be construed and enforced as if the illegal or invalid provisions had not been included, and the illegal or invalid action shall be null and void. 

(e)    Entire Agreement; Governing Documents. The Plan, the Grant Notice and this Agreement (including all Exhibits
thereto) constitute the entire agreement of the parties and supersede in their entirety all prior undertakings and agreements of the Company and Participant with respect to the subject matter hereof. In the event of any contradiction between the
Plan and this Agreement or any other written agreement between a Participant and the Company that has been approved by the Administrator, the terms of the Plan shall govern. Participant hereby agrees to execute such further instruments and to take
such further action as the Company requests to carry out the purposes and intent of this Agreement and the Plan, including, without limitation, restrictions on the transferability of shares of Common Stock, the right of the Company to repurchase
shares of Common Stock, the right of the Company to require that shares of Common Stock be transferred in the event of certain transactions, tag-along rights, bring-along rights, redemption and co-sale rights and voting requirements in accordance with Section 10(o) of the Plan. 

(f)    Governing Law. The provisions of the Plan and all Awards made thereunder, including the Option, shall
be governed by and interpreted in accordance with the laws of the State of Delaware, disregarding choice-of-law principles of the law of any state that would require the
application of the laws of a jurisdiction other than such state. 
 (g)    Titles and Headings. The titles and
headings of the Sections in this Agreement are for convenience of reference only and, in the event of any conflict, the text of this Agreement, rather than such titles or headings, shall control. 

  
 A-5 

 EXHIBIT B 

TO STOCK OPTION GRANT NOTICE 

FORM OF EXERCISE NOTICE 

Effective as of today,             ,
            , the undersigned (“Participant”) hereby elects to exercise Participant’s option to purchase
                     Shares of HilleVax, Inc. (the “Company”) under and pursuant to
the HilleVax, Inc. 2021 Equity Incentive Plan (the “Plan”) and the Stock Option Grant Notice and Stock Option Agreement dated             ,
         (the “Agreement”). Capitalized terms used herein without definition shall have the meanings given in the Agreement. 

 

			
	Grant Date:	  	                                      
                      
		
	Number of Shares as to which Option is Exercised:	  	  

		
	Exercise Price per Share:	  	$            
		
	Total Exercise Price:	  	$            
		
	Certificate to be issued in name of:	  	  

		
	Cash Payment delivered herewith:	  	$             (Representing the full Exercise Price for the Shares, as well as any applicable withholding tax)

  

					
	Type of Option:	  	☐  Incentive Stock Option	  	☐  Non-Qualified Stock Option

 1.    Representations of Participant. Participant acknowledges that
Participant has received, read and understood the Plan and the Agreement. Participant agrees to abide by and be bound by their terms and conditions. 

2.    Tax Consultation. Participant understands that Participant may suffer adverse tax consequences as a
result of Participant’s purchase or disposition of the Shares. Participant represents that Participant has consulted with any tax consultants Participant deems advisable in connection with the purchase or disposition of the Shares and that
Participant is not relying on the Company for any tax advice. Participant is relying solely on such advisors and not on any statements or representations of the Company or any of its agents. Participant understands that Participant (and not the
Company) shall be responsible for Participant’s tax liability that may arise as a result of this investment or the transactions contemplated by this Agreement. 

3.    Participant Representations. Participant hereby makes the following certifications and representations
with respect to the Shares listed above: 
 (a)    Participant is aware of the Company’s business affairs and
financial condition and has acquired sufficient information about the Company to reach an informed and knowledgeable decision to acquire the Shares. Participant is acquiring these Shares for investment for Participant’s own account only and not
with a view to, or for resale in connection with, any “distribution” thereof within the meaning of the Securities Act. 

(b)    Participant acknowledges and understands that the Shares constitute “restricted securities” under the
Securities Act and have not been registered under the Securities Act in reliance upon a specific exemption therefrom, which exemption depends upon, among other things, the bona fide nature 

 
of Participant’s investment intent as expressed herein. Participant understands that the Shares must be held indefinitely unless they are subsequently registered under the Securities Act or
an exemption from such registration is available. Participant further acknowledges and understands that the Company is under no obligation to register the Shares. Participant understands that the certificate evidencing the Shares will be imprinted
with a legend which prohibits the transfer of the Shares unless they are registered or such registration is not required in the opinion of counsel satisfactory to the Company and any other legend required under Applicable Laws. 

(c)    Participant is familiar with the provisions of Rule 701 and Rule 144, each promulgated under the
Securities Act, which, in substance, permit limited public resale of “restricted securities” acquired, directly or indirectly from the issuer thereof, in a non-public offering subject to the
satisfaction of certain conditions. In the event the Company becomes subject to the reporting requirements of Section 13 or 15(d) of the Exchange Act, ninety days thereafter (or such longer period as any market
stand-off agreement may require) the securities exempt under Rule 701 may be resold, subject to the satisfaction of certain of the conditions specified by Rule 144. 

(d)    In the event that the Company does not qualify under Rule 701 at the time of grant of the Option, then the
securities may be resold in certain limited circumstances subject to the provisions of Rule 144. 

(e)    Participant further understands that in the event all of the applicable requirements of Rule 701 or 144 are
not satisfied, registration under the Securities Act, compliance with Regulation A, or some other registration exemption will be required; and that, notwithstanding the fact that Rules 144 and 701 are not exclusive, the Staff of the Securities and
Exchange Commission has expressed its opinion that persons proposing to sell private placement securities other than in a registered offering and otherwise than pursuant to Rules 144 or 701 will have a substantial burden of proof in establishing
that an exemption from registration is available for such offers or sales, and that such persons and their respective brokers who participate in such transactions do so at their own risk. Participant understands that no assurances can be given that
any such other registration exemption will be available in such event. 
 4.    Further Instruments.
Participant hereby agrees to execute such further instruments and to take such further action as the Company requests to carry out the purposes and intent of this Agreement and the Plan, including, without limitation, restrictions on the
transferability of shares of Common Stock, the right of the Company to repurchase shares of Common Stock, the right of the Company to require that shares of Common Stock be transferred in the event of certain transactions, tag-along rights, bring-along rights, redemption and co-sale rights and voting requirements in accordance with Section 10(o) of the Plan. 

5.    Notices. Any notice required or permitted hereunder shall be given in accordance with the provisions
set forth in Section 8(b) of the Agreement. 
 6.    Entire Agreement. The Plan and Agreement are
incorporated herein by reference. This Notice, the Plan and the Agreement constitute the entire agreement of the parties and supersede in their entirety all prior undertakings and agreements of the Company and Participant with respect to the subject
matter hereof. 

  
 B-2 

									
	 ACCEPTED BY:
 HILLEVAX,
INC.
	 	             
	 	 SUBMITTED BY

PARTICIPANT:

					
	By:	 	
                     
                                       
	 		 	By:	 	
                     
                                       

	Print Name:	 	  
	 		 	Print Name:	 	  

	Title:	 	  
	 		 		 	

  
 B-3 

 HILLEVAX, INC. 

2021 EQUITY INCENTIVE PLAN 

RESTRICTED STOCK GRANT NOTICE AND 

RESTRICTED STOCK AGREEMENT 

HilleVax, Inc. (the “Company”), pursuant to its 2021 Equity Incentive Plan (the “Plan”),
hereby grants to Participant the number of shares of the Company’s Common Stock (referred to herein as “Shares”) set forth below. This Restricted Stock award (this “Award”) is subject to all of
the terms and conditions as set forth herein and in the Restricted Stock Agreement attached hereto as Exhibit A (the “Agreement”) and the Plan, each of which is incorporated herein by reference. Unless otherwise
defined herein, the terms defined in the Plan shall have the same defined meanings in this Restricted Stock Grant Notice (“Grant Notice”) and the Agreement. 

 

			
	Participant:	  	  

		
	Grant Date:	  	  

		
	Vesting Commencement Date:	  	  

		
	Total Number of Shares of Restricted Stock:	  	  

		
	Vesting Schedule:	  	The Shares shall vest and be released from the “Forfeiture Restriction” (as defined in Section 2(a) of the Agreement) as follows:
		
		  	[To be specified in individual agreements]

 By his or her signature and the Company’s signature below, Participant agrees to be bound by the terms
and conditions of the Plan, the Agreement and this Grant Notice. Participant has reviewed the Agreement, the Plan and this Grant Notice in their entirety, has had an opportunity to obtain the advice of counsel prior to executing this Grant Notice
and fully understands all provisions of this Grant Notice, the Agreement and the Plan. Participant hereby agrees to accept as binding, conclusive and final all decisions or interpretations of the Administrator of the Plan upon any questions arising
under the Plan or the Agreement. Participant shall also execute and deliver to the Company the stock assignment duly endorsed in blank, attached to this Grant Notice as Exhibit B (the “Stock Assignment”). If
Participant is married, his or her spouse has signed the Consent of Spouse attached to this Grant Notice as Exhibit C. 
  

									
	HILLEVAX, INC.	 	        	 	PARTICIPANT
					
	By:	 	  
	 		 	By:	 	  

	Print Name:	 	  
	 		 	Print Name:	 	  

	Title:	 	  
	 		 	State of Residence:	 	
		 		 		 	  

 EXHIBIT A 

TO RESTRICTED STOCK GRANT NOTICE 

RESTRICTED STOCK AGREEMENT 

Pursuant to the Grant Notice to which this Agreement is attached, the Company has granted to Participant the number of Shares indicated in the
Grant Notice. 
 1.    Grant of Restricted Stock. 

(a)    Grant of Restricted Stock. In consideration of Participant’s past and/or continued employment with or
service to the Company or a parent or subsidiary of the Company and for other good and valuable consideration, which the Administrator has determined exceeds the par value per Share, effective as of the Grant Date set forth in the Grant Notice, the
Company irrevocably grants to Participant the Shares set forth in the Grant Notice, upon the terms and conditions set forth in the Plan and this Agreement. 

(b)    Issuance of Shares. On the Grant Date, the Company shall issue the Shares to Participant and shall
(i) cause a share certificate or certificates representing the Shares to be registered in the name of Participant, or (ii) cause such Shares to be held in book entry form. If a share certificate is issued, it shall be delivered to and held
in custody by the Company and shall bear the restrictive legends required by Section 4(a) below. If the Shares are held in book entry form, then such entry will reflect that the Shares are subject to the restrictions of this Agreement. 

(c)    Rights as a Stockholder. Except as otherwise provided herein, upon issuance of the Shares by the Company to
Participant (as evidenced by the appropriate entry on the books of the Company or of a duly authorized transfer agent of the Company), Participant shall have all the rights of a stockholder with respect to said Shares, including the right to receive
any cash or stock dividends or other distributions paid to or made with respect to the Shares, subject to the restrictions described in the following sentence, which restrictions shall lapse when the Unreleased Shares are released from the
Forfeiture Restriction as set forth in Section 2. Unless otherwise provided by the Administrator, if any dividends or distributions are paid in cash or shares, or consist of a dividend or distribution to holders of Common Stock of property, the
cash, shares or other property paid or made with respect to Unreleased Shares will be retained in custody by the Company (without interest) (the “Retained Distributions”) and subject to the same forfeiture and transferability
restrictions as the Unreleased Shares with respect to which they were paid or made and shall automatically be forfeited to the Company for no consideration in the event of the forfeiture of the Unreleased Shares with respect to which they were paid
pursuant to the Forfeiture Restriction. Any Retained Distributions held by the Company that were paid on those Unreleased Shares as to which the Forfeiture Restriction and transfer restrictions lapse or are removed shall also be released to
Participant at the time of such lapse or removal. In no event shall a Retained Distribution be paid with respect to Unreleased Shares later than the end of the calendar year in which the corresponding dividends or distributions are paid to holders
of Common Stock or, if later, the 15th day of the third month following the later of (a) the date the dividends or distributions are paid to holders of Common Stock and (b) the date the Unreleased Shares with respect to which the Retained
Distributions are paid vest. Participant shall enjoy rights as a stockholder until such time as Participant disposes of the Shares or the Company and/or its assignee(s) exercises the Right of First Refusal under the Plan. Upon such exercise,
Participant shall have no further rights as a holder of the Shares except the right to receive payment for the Shares so purchased in accordance with the provisions of the Plan and this Agreement, and Participant shall forthwith cause the
certificate(s), if any issued, evidencing the Shares so purchased to be surrendered to the Company for transfer or cancellation. 

 2.    Restrictions on Shares. 

(a)    Forfeiture Restriction. Subject to the provisions of Section 2(b) below, in the event of
Participant’s Termination of Service for any reason, all of the Shares which, from time to time, have not yet been released from the Forfeiture Restriction (together with and any Retained Distributions paid thereon pursuant to Section 1(c)
and held by the Company, the “Unreleased Shares”) shall thereupon be forfeited immediately and without any further action by the Company (the “Forfeiture Restriction”). Upon the occurrence of such
forfeiture, the Company shall become the legal and beneficial owner of the Unreleased Shares, and all rights and interests therein or relating thereto, and the Company shall have the right to retain and transfer to its own name the number of
Unreleased Shares being forfeited by Participant. The Unreleased Shares shall be held by the Company in accordance with Section 3 until the Shares are forfeited as provided in this Section 2(a), until such Unreleased Shares are fully
released from the Forfeiture Restriction, or until such time as this Agreement no longer is in effect. Participant hereby authorizes and directs the Secretary of the Company, or such other person designated by the Administrator, to transfer the
Unreleased Shares which have been forfeited pursuant to this Section 2(a) from Participant to the Company. 

(b)    Release of Shares from Forfeiture Restriction. The Shares shall be released from the Forfeiture Restriction
in accordance with the vesting schedule set forth in the Grant Notice. As soon as administratively practicable following the release of any Shares from the Forfeiture Restriction, the Company shall, as applicable, either deliver to Participant the
certificate or certificates representing such Shares in the Company’s possession belonging to Participant, or, if the Shares are held in book entry form, then the Company shall remove the notations on the book form. Participant (or the
beneficiary or personal representative of Participant in the event of Participant’s death or incapacity, as the case may be) shall deliver to the Company any representations or other documents or assurances as the Company or its representatives
deem necessary or advisable in connection with any such delivery. 
 (c)    Transferability. Except as otherwise
permitted by the Administrator, the Unreleased Shares shall not be sold, assigned, transferred, pledged or otherwise encumbered by Participant, either voluntarily or by operation of law, except by will or the laws of descent and distribution. 

3.    Escrow. To insure the availability for delivery of the Unreleased Shares in the event of the
application of the Forfeiture Restriction, Participant appoints the Secretary of the Company, or such other person designated by the Administrator from time to time as escrow agent, as its attorney-in-fact to sell, assign and transfer unto the Company, such Unreleased Shares, if any, forfeited pursuant to the Forfeiture Restriction, together with any Retained Distributions paid thereon pursuant
to Section 1(c) and held by the Company, and shall deliver and deposit with the Secretary of the Company, or such other person designated by the Administrator from time to time, the share certificate(s) representing the Shares, together with
the Stock Assignment. The Unreleased Shares and Stock Assignment (and any Retained Distributions) shall be held by the Secretary, or such other person designated by the Administrator from time to time, in escrow, until the Shares are forfeited as
provided in Section 2(a), until such Shares are fully released from the Forfeiture Restriction or until such time as this Agreement no longer is in effect. Upon release of the Unreleased Shares from the Forfeiture Restriction, the escrow agent
shall as soon as reasonably practicable deliver to Participant the certificate or certificates representing such Shares in the escrow agent’s possession belonging to Participant, and the escrow agent shall be discharged of all further
obligations hereunder. The Company, or its designee, shall not be liable for any act it may do or omit to do with respect to holding the Shares (or any Retained Distributions) in escrow and while acting in good faith and in the exercise of its
judgment. 

  
 A-2 

 4.    Restrictive Legends and Stop-Transfer Orders. 
 (a)    Legends. Participant understands and agrees
that the Company shall cause any certificates issued evidencing the Shares to have the legends set forth below or legends substantially equivalent thereto, together with any other legends that may be required by Applicable Laws: 

THE SHARES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (“ACT”), NOR HAVE THEY BEEN
REGISTERED OR QUALIFIED UNDER THE SECURITIES LAWS OF ANY STATE. NO TRANSFER OF SUCH SECURITIES WILL BE PERMITTED UNLESS A REGISTRATION STATEMENT UNDER THE ACT IS IN EFFECT AS TO SUCH TRANSFER, THE TRANSFER IS MADE IN ACCORDANCE WITH RULE 144 UNDER
THE ACT, OR IN THE OPINION OF COUNSEL (WHICH MAY BE COUNSEL FOR THE COMPANY) REGISTRATION UNDER THE ACT IS UNNECESSARY IN ORDER FOR SUCH TRANSFER TO COMPLY WITH THE ACT AND WITH APPLICABLE STATE SECURITIES LAWS. 

THE SHARES REPRESENTED BY THIS CERTIFICATE MAY BE SUBJECT TO FORFEITURE PURSUANT TO, AND MAY BE TRANSFERRED ONLY IN ACCORDANCE WITH, THE TERMS
OF AN AGREEMENT BETWEEN THE COMPANY AND THE STOCKHOLDER, A COPY OF WHICH IS ON FILE WITH THE SECRETARY OF THE COMPANY. SUCH FORFEITURE AND/OR TRANSFER RESTRICTIONS ARE BINDING ON TRANSFEREES OF THESE SHARES. 

(b)    Stop Transfer Orders. Participant agrees that, in order to ensure compliance with the restrictions referred
to in the Plan and this Agreement, the Company may issue appropriate “stop transfer” instructions to its transfer agent, if any, and that, if the Company transfers its own securities, it may make appropriate notations to the same
effect in its own records. 
 (c)    Impermissible Transfers Void. The Company shall not be required (i) to
transfer on its books any Shares that have been sold or otherwise transferred in violation of any of the provisions of this Agreement or (ii) to treat as owner of such Shares or to accord the right to vote or pay dividends to any purchaser or
other transferee to whom such Shares shall have been so transferred. Any transfer or attempted transfer of the Shares not in accordance with the terms of this Agreement shall be void. 

5.    Taxes. 

(a)    Tax Consequences of Award. Participant understands that Participant may suffer adverse tax consequences as a
result of Participant’s receipt of, vesting in or disposition of the Shares. Participant represents that Participant has consulted with any tax consultants Participant deems advisable in connection with the receipt of the Shares and that
Participant is not relying on the Company for any tax advice. Participant is relying solely on such advisors and not on any statements or representations of the Company or any of its agents. Participant understands that Participant (and not the
Company) shall be responsible for Participant’s tax liability that may arise as a result of the transactions contemplated by this Agreement. 

  
 A-3 

 (b)    Section 83(b) Election for Unreleased
Shares. Participant acknowledges that, unless an election is filed by Participant with the Internal Revenue Service and, if necessary, the proper state taxing authorities, within thirty days of the receipt of the Unreleased Shares, electing
pursuant to Section 83(b) of the Code (and similar state tax provisions if applicable) to be taxed currently on their Fair Market Value on the date of issuance, there will be a recognition of taxable income to the Participant equal to the Fair
Market Value of the Unreleased Shares at the time the Forfeiture Restriction lapses. Participant represents that Participant has consulted any tax consultant(s) Participant deems advisable in connection with the purchase of the Shares or the filing
of the election under Section 83(b) of the Code and similar tax provisions. 
 PARTICIPANT ACKNOWLEDGES THAT IT IS PARTICIPANT’S
SOLE RESPONSIBILITY AND NOT THE COMPANY’S TO TIMELY FILE THE ELECTION UNDER SECTION 83(B) OF THE CODE, AND THE COMPANY AND ITS REPRESENTATIVES SHALL HAVE NO OBLIGATION OR AUTHORITY TO MAKE THIS FILING ON PARTICIPANT’S BEHALF. 

(b)    Tax Withholding. The Company shall have the authority and the right to deduct or withhold, or require
Participant to remit to the Company, an amount sufficient to satisfy federal, state, local and foreign taxes (including Participant’s employment tax obligation) required by Applicable Law to be withheld with respect to any taxable event
concerning Participant arising as a result of the grant or vesting of the Shares or otherwise under this Agreement, including, without limitation, the authority to deduct such amounts from other compensation payable to Participant by the Company.

 6.    Participant Representations. Participant hereby makes the following certifications and
representations with respect to the Shares listed above: 
 (a)    Participant is aware of the Company’s business
affairs and financial condition and has acquired sufficient information about the Company to reach an informed and knowledgeable decision to acquire the Shares. Participant is acquiring these Shares for investment for Participant’s own account
only and not with a view to, or for resale in connection with, any “distribution” thereof within the meaning of the Securities Act. 

(b)    Participant acknowledges and understands that the Shares constitute “restricted securities” under the
Securities Act and have not been registered under the Securities Act in reliance upon a specific exemption therefrom, which exemption depends upon, among other things, the bona fide nature of Participant’s investment intent as expressed herein.
Participant understands that the Shares must be held indefinitely unless they are subsequently registered under the Securities Act or an exemption from such registration is available. Participant further acknowledges and understands that the Company
is under no obligation to register the Shares. Participant understands that the certificate evidencing the Shares will be imprinted with a legend which prohibits the transfer of the Shares unless they are registered or such registration is not
required in the opinion of counsel satisfactory to the Company and any other legend required under Applicable Laws. 

(c)    Participant is familiar with the provisions of Rule 701 and Rule 144, each promulgated under the
Securities Act, which, in substance, permit limited public resale of “restricted securities” acquired, directly or indirectly from the issuer thereof, in a non-public offering subject to the
satisfaction of certain conditions. In the event the Company becomes subject to the reporting requirements of Section 13 or 15(d) of the Exchange Act, ninety days thereafter (or such longer period as any market
stand-off agreement may require) the securities exempt under Rule 701 may be resold, subject to the satisfaction of certain of the conditions specified by Rule 144. 

  
 A-4 

 (d)    In the event that the Company does not qualify under
Rule 701 at the time of issuance of the Shares, then the securities may be resold in certain limited circumstances subject to the provisions of Rule 144. 

(e)    Participant further understands that in the event all of the applicable requirements of Rule 701 or 144 are
not satisfied, registration under the Securities Act, compliance with Regulation A, or some other registration exemption will be required; and that, notwithstanding the fact that Rules 144 and 701 are not exclusive, the Staff of the Securities and
Exchange Commission has expressed its opinion that persons proposing to sell private placement securities other than in a registered offering and otherwise than pursuant to Rules 144 or 701 will have a substantial burden of proof in establishing
that an exemption from registration is available for such offers or sales, and that such persons and their respective brokers who participate in such transactions do so at their own risk. Participant understands that no assurances can be given that
any such other registration exemption will be available in such event. 
 7.    Miscellaneous. 

(a)    No Right To Employment or Other Status. No person shall have any claim or right to be granted an Award, and
the grant of an Award shall not be construed as giving Participant the right to continued employment or any other relationship with the Company. The Company expressly reserves the right at any time to dismiss or otherwise terminate its relationship
with Participant free from any liability or claim under the Plan or this Agreement. 
 (b)    Notices. Any notice
to be given under the terms of this Agreement to the Company shall be addressed to the Company in care of the Secretary of the Company at the Company’s principal executive offices, and any notice to be given to Participant shall be addressed to
Participant at the most-recent physical or email address for Participant listed in the Company’s personnel records. By a notice given pursuant to this Section 7(b), either party may hereafter designate a different address for notices to be
given to that party. Any notice shall be deemed duly given when sent via email or when sent by certified mail (return receipt requested) and deposited (with postage prepaid) in a post office or branch post office regularly maintained by the United
States Postal Service. 
 (c)    Successors and Assigns. The Company may assign any of its rights under this
Agreement to single or multiple assignees, and this Agreement shall inure to the benefit of the successors and assigns of the Company. Subject to the restrictions on transfer herein set forth, this Agreement shall be binding upon Participant and his
or her heirs, executors, administrators, successors and assigns. 
 (d)    Severability. In the event any portion
of the Plan or this Agreement or any action taken pursuant hereto shall be held illegal or invalid for any reason, the illegality or invalidity shall not affect the remaining parts of the Plan and this Agreement, and the Plan and this Agreement
shall be construed and enforced as if the illegal or invalid provisions had not been included, and the illegal or invalid action shall be null and void. 

(e)    Entire Agreement; Governing Documents. The Plan, the Grant Notice and this Agreement (including all Exhibits
thereto) constitute the entire agreement of the parties and supersede in their entirety all prior undertakings and agreements of the Company and Participant with respect to the subject matter hereof. In the event of any contradiction between the
Plan and this Agreement or any other written agreement between a Participant and the Company that has been approved by the Administrator, the terms of the Plan shall govern. Participant hereby agrees to execute such further instruments and to take
such further action as the Company requests to carry out the purposes and intent of this Agreement and the Plan, including, without limitation, restrictions on the transferability of shares of Common Stock, the right of the Company to repurchase
shares of Common Stock, the right of the Company to require that 

  
 A-5 

 
shares of Common Stock be transferred in the event of certain transactions, tag-along rights, bring-along rights, redemption and co-sale rights and voting requirements in accordance with Section 10(o) of the Plan. 

(f)    Governing Law. The provisions of the Plan and all Awards made thereunder, including the Shares, shall
be governed by and interpreted in accordance with the laws of the State of Delaware, disregarding choice-of-law principles of the law of any state that would require the
application of the laws of a jurisdiction other than such state. 
 (g)    Titles and Headings. The titles and
headings of the Sections in this Agreement are for convenience of reference only and, in the event of any conflict, the text of this Agreement, rather than such titles or headings, shall control. 

  
 A-6 

 EXHIBIT B 

TO STOCK OPTION GRANT NOTICE 

STOCK ASSIGNMENT 
 [See
instructions below] 
 FOR VALUE RECEIVED I,
                , hereby sell, assign and transfer unto
                     the shares of the Common Stock of HilleVax, Inc. registered in my name on the books of said corporation represented by
Certificate No.     and do hereby irrevocably constitute and appoint                      to transfer the said stock on the books
of the within named corporation with full power of substitution in the premises. 
 This Assignment Separate from Certificate may be used
only in accordance with the Restricted Stock Grant Notice and Restricted Stock Agreement between HilleVax, Inc. and the undersigned dated
                    .  
 Dated:
            ,          
  

			
	Signature:	 	  

		 	[Name]

 INSTRUCTIONS: Please do not fill in any blanks other than the signature line. The purpose of this
assignment is to enable the Company to enforce the Forfeiture Restriction, as set forth in the Restricted Stock Grant Notice and Restricted Stock Agreement, without requiring additional signatures on the part of Participant. 

  
 B-1 

 EXHIBIT C 

TO RESTRICTED STOCK GRANT NOTICE 

CONSENT OF SPOUSE 
 I,
                , spouse of                     , have read and
approve the foregoing Restricted Stock Grant Notice and Restricted Stock Agreement dated                     , between my spouse and HilleVax, Inc.
In consideration of issuing to my spouse the shares of the Common Stock of HilleVax, Inc. set forth in the Restricted Stock Grant Notice and Restricted Stock Agreement, I hereby appoint my spouse as my attorney-in-fact in respect to the exercise of any rights under the Restricted Stock Grant Notice and Restricted Stock Agreement and agree to be bound by the provisions of the Restricted Stock Grant Notice
and Restricted Stock Agreement insofar as I may have any rights in said Agreement or any shares issued pursuant thereto under the community property laws or similar laws relating to marital property in effect in the state of our residence as of the
date of the signing of the Restricted Stock Grant Notice and Restricted Stock Agreement. 
  

							
	Dated:             ,         	 		 		 	Signature of Spouse:
                                         
                           

  
 C-1

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