Document:

EX-4.2

 Exhibit 4.2 

INVESTORS’ RIGHTS AGREEMENT 

THIS INVESTORS’ RIGHTS AGREEMENT (this “Agreement”) is made as of the
13th day of July, 2020, by and among BioAtla, Inc., a Delaware corporation (the “Company”), each of the investors listed on Schedule A hereto, each of which is referred to
in this Agreement as an “Investor”, and each of the direct and indirect beneficial owners of the Company’s Common Stock listed on Schedule B hereto, each of whom is referred to herein as a “Key Holder”,
and any Additional Purchaser (as defined in the Purchase Agreement (as defined below)) that becomes a party to this Agreement in accordance with Section 6.9 hereof. 

RECITALS 

WHEREAS, the Company and the Investors are parties to the Series D Preferred Stock Purchase Agreement of even date herewith (as amended
from time to time, the “Purchase Agreement”); and 
 WHEREAS, in order to induce the Company to enter into the
Purchase Agreement and to induce the Investors to invest funds in the Company pursuant to the Purchase Agreement, the Investors and the Company hereby agree that this Agreement shall govern the rights of the Investors to cause the Company to
register shares of Common Stock issuable to the Investors, to receive certain information from the Company, and to participate in future equity offerings by the Company, and shall govern certain other matters as set forth in this Agreement. 

NOW, THEREFORE, the parties hereby agree as follows: 

1. Definitions. For purposes of this Agreement: 

1.1. “Affiliate” means, with respect to any specified 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, director or trustee of such Person, or any limited liability company, limited partnership, investment fund or
registered investment company now or hereafter existing that is controlled by one or more general partners, managers, managing members or investment advisors of, or shares the same management company or investment advisor with, such Person; any
wholly-owned subsidiary of such Person; or any direct or indirect wholly-owned subsidiary of the ultimate parent entity of such Person; provided, however, that (i) each Janus Investor shall be deemed to be an “Affiliate”
of each other Janus Investor, and (ii) an entity that is an “Affiliate” of a Janus Investor (other than pursuant to the foregoing subpart (i)) shall not be deemed to be an “Affiliate” of any other Janus Investor unless such
entity is a Janus Investor (and, for the avoidance of doubt, an “Affiliate” of such entity shall not be deemed an “Affiliate” of any Janus Investor solely by virtue of being an “Affiliate” of such entity).. 

1.2. “Board” means the board of directors of the Company. 

1.3. “Certificate of Incorporation” means the Company’s Certificate of Incorporation, as amended and/or restated from
time to time. 

 1.4. “Common Stock” means shares of the Company’s common stock, par
value $0.0001 per share. 
 1.5. “Damages” means any loss, damage, claim or liability (joint or several) to which a party
hereto may become subject under the Securities Act, the Exchange Act, or other federal or state law, insofar as such loss, damage, claim or liability (or any action in respect thereof) arises out of or is based upon (i) any untrue statement or
alleged untrue statement of a material fact contained in any registration statement of the Company, including any preliminary prospectus or final prospectus contained therein or any amendments or supplements thereto; (ii) an omission or alleged
omission to state therein a material fact required to be stated therein, or necessary to make the statements therein not misleading; or (iii) any violation or alleged violation by the indemnifying party (or any of its agents or
Affiliates) of the Securities Act, the Exchange Act, any state securities law, or any rule or regulation promulgated under the Securities Act, the Exchange Act, or any state securities law. 

1.6. “Derivative Securities” means any securities or rights convertible into, or exercisable or exchangeable for (in each
case, directly or indirectly), Common Stock, including options and warrants. 
 1.7. “Exchange Act” means the Securities
Exchange Act of 1934, as amended, and the rules and regulations promulgated thereunder. 
 1.8. “Excluded Registration”
means (i) a registration relating to the sale of securities to employees of the Company or a subsidiary pursuant to a stock option, stock purchase, or similar plan; (ii) a registration relating to an SEC Rule 145 transaction;
(iii) 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; or (iv) a registration in which the
only Common Stock being registered is Common Stock issuable upon conversion of debt securities that are also being registered. 
 1.9.
“Form S-1” means such form under the Securities Act as in effect on the date hereof or any successor registration form under the Securities Act subsequently adopted by the SEC. 

1.10. “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 incorporation of substantial information by reference to other documents filed by the Company with the SEC. 

1.11. “GAAP” means generally accepted accounting principles in the United States, as in effect from time to time. 

1.12. “HBM Director” means the director of the Company that has been solely designated by HBM Healthcare Investments (Cayman)
Ltd. (“HBM”) pursuant to the Certificate of Incorporation, the Voting Agreement or otherwise. 
 1.13.
“Holder” means any holder of Registrable Securities who is a party to this Agreement. 

  
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 1.14. “Immediate Family Member” means a child, stepchild, grandchild,
parent, stepparent, grandparent, spouse, sibling, mother-in-law, father-in-law, son-in-law, daughter-in-law,
brother-in-law, or sister-in-law, including adoptive relationships, of a
natural person referred to herein. 
 1.15. “Initiating Holders” means, collectively, Holders who properly initiate a
registration request under this Agreement. 
 1.16. “IPO” means the Company’s first underwritten public offering of
its Common Stock under the Securities Act. 
 1.17. “Janus Investor” shall mean Investors, or
permitted transferees of Registrable Securities held by Janus Investors, that are advisory or subadvisory clients of Janus Capital Management LLC, including, but not limited to, Janus Henderson Global Life Sciences Fund, Janus Henderson Capital
Funds Plc—Janus Henderson Global Life Sciences Fund, and Janus Henderson Biotech Innovation Master Fund Limited. 
 1.18. “Key
Employee” means any executive-level employee (including division director and vice president-level positions) as well as any employee who, either alone or in concert with others, develops, invents, programs, or designs any Company
Intellectual Property (as defined in the Purchase Agreement). 
 1.19. “Key Holder Registrable Securities” means
(i) shares of Common Stock held by the Key Holders, and (ii) any Common Stock issued as (or issuable upon the conversion or exercise of any warrant, right, or other security that is issued as) a dividend or other distribution with respect
to, or in exchange for or in replacement of such shares. 
 1.20. “Major Investor” means (i) any Investor that,
individually or together with such Investor’s Affiliates, purchases at least 3,879,357 shares of Series D Preferred Stock and continues to hold fifty percent (50%) of such shares purchased thereby (as adjusted for any stock split, stock
dividend, combination, or other recapitalization or reclassification effected after the date hereof) and (ii) any Key Holder or permitted assignee that, individually or together with its Affiliates, holds at least 3,879,357 shares of Common
Stock (as adjusted for any stock split, stock dividend, combination, or other recapitalization or reclassification effected after the date hereof) originally purchased thereby. 

1.21. “New Securities” means, collectively, equity securities of the Company, whether or not currently authorized, as well as
rights, options, or warrants to purchase such equity securities, or securities of any type whatsoever that are, or may become, convertible or exchangeable into or exercisable for such equity securities. 

1.22. “Person” means any individual, corporation, partnership, trust, limited liability company, association or other entity.

 1.23. “Registrable Securities” means (i) the Common Stock issuable or issued upon conversion of the Series D
Preferred Stock; (ii) any Common Stock, or any Common Stock issued or issuable (directly or indirectly) upon conversion and/or exercise of any other securities of the Company, acquired by the Investors after the date hereof; (iii) the Key
Holder Registrable 

  
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Securities, provided, however, that such Key Holder Registrable Securities shall not be deemed Registrable Securities and the Key Holders shall not be deemed Holders for purposes of
Subsections 2.1, 2.10, 3.1, 3.2, and 6.6; (iv) any Common Stock issued as (or issuable upon the conversion or exercise of any warrant, right, or other security that is issued as) a dividend or other distribution
with respect to, or in exchange for or in replacement of, the shares referenced in clauses (i) and (ii) above; excluding in all cases, however, any Registrable Securities sold by a Person in a transaction in which the
applicable rights under this Agreement are not assigned pursuant to Subsection 6.1, and excluding for purposes of Section 2 any shares for which registration rights have terminated pursuant to Subsection 2.13 of this
Agreement. 
 1.24. “Registrable Securities then outstanding” means the number of shares determined by adding the number of
shares of outstanding Common Stock that are Registrable Securities and the number of shares of Common Stock issuable (directly or indirectly) pursuant to then exercisable and/or convertible securities that are Registrable Securities. 

1.25. “Restricted Securities” means the securities of the Company required to bear the legend set forth in
Subsection 2.12(b) hereof. 
 1.26. “SEC” means the Securities and Exchange Commission. 

1.27. “SEC Rule 144” means Rule 144 promulgated by the SEC under the Securities Act. 

1.28. “SEC Rule 145” means Rule 145 promulgated by the SEC under the Securities Act. 

1.29. “Securities Act” means the Securities Act of 1933, as amended, and the rules and regulations promulgated thereunder.

 1.30. “Selling Expenses” means all underwriting discounts, selling commissions, and stock transfer taxes applicable to
the sale of Registrable Securities, and fees and disbursements of counsel for any Holder, except for the fees and disbursements of the Selling Holder Counsel borne and paid by the Company as provided in Subsection 2.6. 

1.31. “Series D Directors” means the directors of the Company that have been solely designated by the holders of record of
the Series D Preferred Stock pursuant to the Certificate of Incorporation, the Voting Agreement or otherwise. For the avoidance of doubt, the Series D Directors shall include the Soleus Director and the HBM Director. 

1.32. “Series D Preferred Stock” means shares of the Company’s Series D Preferred Stock, par value $0.0001 per share.

 1.33. “Soleus Director” means the director of the Company that has been solely designated by Soleus Private Equity Fund
I, L.P. (or its affiliates) (“Soleus”) pursuant to the Certificate of Incorporation, the Voting Agreement or otherwise. 

  
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 1.34. “Voting Agreement” means the Voting Agreement, dated as of the date
hereof, among the Company and the Investors, as the same may be amended, restated or otherwise modified from time to time. 
 2.
Registration Rights. The Company covenants and agrees as follows: 
 2.1. Demand Registration. 

(a) Form S-1 Demand. If at any time after the earlier to occur of (i) five (5) years
after the date of this Agreement; or (ii) one hundred eighty (180) days after the effective date of the registration statement for the IPO, the Company receives a request from the Holders of at least a majority of the Registrable
Securities then outstanding that the Company file a Form S-1 registration statement with respect to the outstanding Registrable Securities of such Holders having an anticipated aggregate offering price
of at least $5 million, then the Company shall (A) within ten (10) days after the date such request is given, give notice thereof (the “Demand Notice”) to all Holders other than the Initiating Holders; and (B) as
soon as practicable, and in any event within sixty (60) days after the date such request is given by the Initiating Holders, file a Form S-1 registration statement under the Securities Act covering all
Registrable Securities that the Initiating Holders requested to be registered and any additional Registrable Securities requested to be included in such registration by any other Holders, as specified by notice given by each such Holder to
the Company within twenty (20) days of the date the Demand Notice is given, and in each case, subject to the limitations of Subsections 2.1(c) and 2.3. 

(b) Form S-3 Demand. If at any time when it is eligible to use a Form S-3 registration statement, the Company receives a request from Holders of at least ten percent (10%) of the Registrable Securities then outstanding that the Company file a Form
S-3 registration statement with respect to outstanding Registrable Securities of such Holders having an anticipated aggregate offering price, net of Selling Expenses, of at least $3 million, then the
Company shall (i) within ten (10) days after the date such request is given, give a Demand Notice to all Holders other than the Initiating Holders; and (ii) as soon as practicable, and in any event within forty-five (45) days
after the date such request is given by the Initiating Holders, file a Form S-3 registration statement under the Securities Act covering all Registrable Securities requested to be included in such registration
by any other Holders, as specified by notice given by each such Holder to the Company within twenty (20) days of the date the Demand Notice is given, and in each case, subject to the limitations of Subsections 2.1(c) and 2.3. 

(c) Notwithstanding the foregoing obligations, if the Company furnishes to Holders requesting a registration pursuant to this Subsection 2.1
a certificate signed by the Company’s chief executive officer stating that in the good faith judgment of the Board it would be materially detrimental to the Company and its stockholders for such registration statement to either become effective
or remain effective for as long as such registration statement otherwise would be required to remain effective, because such action would (i) materially interfere with a significant acquisition, corporate reorganization, or other similar
transaction involving the Company; (ii) require premature disclosure of material information that the Company has a bona fide business purpose for preserving as confidential; or (iii) render the Company unable to comply with requirements
under the Securities Act or Exchange Act, then the Company shall have the right to defer taking action with respect to such filing, and any time periods with respect to filing 

  
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or effectiveness thereof shall be tolled correspondingly, for a period of not more than sixty (60) days after the request of the Initiating Holders is given; provided, however, that the
Company may not invoke this right more than once in any twelve (12) month period; and provided further that the Company shall not register any securities for its own account or that of any other stockholder during such sixty (60) day
period other than an Excluded Registration. 
 (d) The Company shall not be obligated to effect, or to take any action to effect, any
registration pursuant to Subsection 2.1(a) (i) during the period that is sixty (60) days before the Company’s good faith estimate of the date of filing of, and ending on a date that is one hundred eighty (180) days after
the effective date of, a Company-initiated registration, provided, that the Company is actively employing in good faith commercially reasonable efforts to cause such registration statement to become effective; (ii) after the Company has
effected two (2) registrations pursuant to Subsection 2.1(a); or (iii) if the Initiating Holders propose to dispose of shares of Registrable Securities that may be immediately registered on Form
S-3 pursuant to a request made pursuant to Subsection 2.1(b). The Company shall not be obligated to effect, or to take any action to effect, any registration pursuant to Subsection
2.1(b) (A) during the period that is thirty (30) days before the Company’s good faith estimate of the date of filing of, and ending on a date that is ninety (90) days after the effective date of, a Company-initiated
registration, provided, that the Company is actively employing in good faith commercially reasonable efforts to cause such registration statement to become effective; or (B) if the Company has effected two (2) registrations pursuant
to Subsection 2.1(b) within the twelve (12) month period immediately preceding the date of such request. A registration shall not be counted as “effected” for purposes of this Subsection 2.1(d) until such
time as the applicable registration statement has been declared effective by the SEC, unless the Initiating Holders withdraw their request for such registration, elect not to pay the registration expenses therefor, and forfeit their right to one
(1) demand registration statement pursuant to Subsection 2.6, in which case such withdrawn registration statement shall be counted as “effected” for purposes of this Subsection 2.1(d).  

2.2. Company Registration. If the Company proposes to register (including, for this purpose, a registration effected by the Company for
stockholders other than the Holders) any of its Common Stock under the Securities Act in connection with the public offering of such securities solely for cash (other than in an Excluded Registration), the Company shall, at such time, promptly give
each Holder notice of such registration. Upon the request of each Holder given within twenty (20) days after such notice is given by the Company, the Company shall, subject to the provisions of Subsection 2.3, cause to be
registered all of the Registrable Securities that each such Holder has requested to be included in such registration. The Company shall have the right to terminate or withdraw any registration initiated by it under this Subsection 2.2
before the effective date of such registration, whether or not any Holder has elected to include Registrable Securities in such registration. The expenses (other than Selling Expenses) of such withdrawn registration shall be borne by the Company in
accordance with Subsection 2.6. 
 2.3. Underwriting Requirements. 

(a) If, pursuant to Subsection 2.1, 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 Subsection 2.1, and the Company shall include such information in the Demand Notice. The underwriter(s) will be

  
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selected by the Company and shall be reasonably acceptable to a majority in interest of the Initiating Holders. In such event, the right of any Holder to include such Holder’s 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 to the extent provided herein. All Holders proposing
to distribute their securities through such underwriting shall (together with the Company as provided in Subsection 2.4(e)) enter into an underwriting agreement in customary form with the underwriter(s) selected for such underwriting.
Notwithstanding any other provision of this Subsection 2.3, if the managing underwriter(s) advise(s) the Initiating Holders in writing that marketing factors require a limitation on the number of shares to be underwritten, then the
Initiating Holders shall so advise all Holders of Registrable Securities that otherwise would be underwritten pursuant hereto, and the number of Registrable Securities that may be included in the underwriting shall be allocated among such Holders of
Registrable Securities, including the Initiating Holders, in proportion (as nearly as practicable) to the number of Registrable Securities owned by each Holder or in such other proportion as shall mutually be agreed to by all such selling Holders;
provided, however, that the number of Registrable Securities held by the Holders to be included in such underwriting shall not be reduced unless all other securities are first entirely excluded from the underwriting. 

(b) In connection with any offering involving an underwriting of shares of the Company’s capital stock pursuant to Subsection
2.2, the Company shall not be required to include any of the Holders’ Registrable Securities in such underwriting unless the Holders accept the terms of the underwriting as agreed upon between the Company and its underwriters, and
then only in such quantity as the underwriters in their sole discretion determine will not jeopardize the success of the offering by the Company. If the total number of securities, including Registrable Securities, requested by stockholders to be
included in such offering exceeds the number of securities to be sold (other than by the Company) that the underwriters in their reasonable discretion determine 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, which the underwriters and the Company in their sole discretion determine will not jeopardize the success of the offering. If 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 allocated among the selling Holders in proportion (as nearly as
practicable to) the number of Registrable Securities owned by each selling Holder or in such other proportions as shall mutually be agreed to by all such selling Holders. To facilitate the allocation of shares in accordance with the above
provisions, the Company or the underwriters may round the number of shares allocated to any Holder to the nearest one hundred (100) shares. Notwithstanding the foregoing, in no event shall (i) the number of Registrable Securities included
in the offering be reduced unless all other securities (other than securities to be sold by the Company) are first entirely excluded from the offering, (ii) the number of Registrable Securities included in the offering be reduced below twenty
percent (20%) of the total number of securities included in such offering, unless such offering is the IPO, in which case the selling Holders may be excluded further if the underwriters make the determination described above and no other
stockholder’s securities are included in such offering, or (iii) notwithstanding (ii) above, any Registrable Securities which are not Key Holder Registrable Securities be excluded from such underwriting unless all Key Holder
Registrable Securities are first excluded from such offering. For purposes of the provision in this Subsection 2.3(b) concerning apportionment, for any selling Holder that is a partnership, limited liability company, or corporation,
the partners, 

  
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members, retired partners, retired members, stockholders, and Affiliates of such Holder, or the estates and Immediate Family Members of any such partners, retired partners, members, and retired
members 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 number of
Registrable Securities owned by all Persons included in such “selling Holder,” as defined in this sentence. 
 (c) For purposes
of Subsection 2.1, a registration shall not be counted as “effected” if, as a result of an exercise of the underwriter’s cutback provisions in Subsection 2.3(a), fewer than fifty percent (50%) of the total number of
Registrable Securities that Holders have requested to be included in such registration statement are actually included. 
 2.4.
Obligations of the Company. Whenever required under this Section 2 to effect the registration of any Registrable Securities, the Company shall, as expeditiously as reasonably possible: 

(a) 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; provided, however, that (i) such one hundred twenty (120) day period shall be extended for a period
of time equal to the period the Holder refrains, at the request of an underwriter of Common Stock (or other securities) of the Company, from selling any securities included in such registration, and (ii) in the case of any registration of
Registrable Securities on Form S-3 that are intended to be offered on a continuous or delayed basis, subject to compliance with applicable SEC rules, such one hundred twenty (120) day period shall be
extended for up to sixty (60) days, if necessary, to keep the registration statement effective until all such Registrable Securities are sold; 

(b) 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 Securities Act in order to enable the disposition of all securities covered by such registration statement; 

(c) furnish to the selling Holders such numbers of copies of a prospectus, including a preliminary prospectus, as required by the Securities
Act, and such other documents as the Holders may reasonably request in order to facilitate their disposition of their Registrable Securities; 

(d) 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 selling Holders; provided that the Company shall not be required to qualify to do business or to file a
general consent to service of process in any such states or jurisdictions, unless the Company is already subject to service in such jurisdiction and except as may be required by the Securities Act; 

  
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 (e) 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 underwriter(s) of such offering; 
 (f) use its
commercially reasonable efforts to cause all such Registrable Securities covered by such registration statement to be listed on a national securities exchange or trading system and each securities exchange and trading system (if any) on which
similar securities issued by the Company are then listed; 
 (g) provide a transfer agent and registrar for all Registrable Securities
registered pursuant to this Agreement and provide a CUSIP number for all such Registrable Securities, in each case not later than the effective date of such registration; 

(h) promptly make available for inspection by the selling Holders, any managing underwriter(s) participating in any disposition pursuant to
such registration statement, and any attorney or accountant or other agent retained by any such underwriter or selected by the selling Holders, all financial and other records, pertinent corporate documents, and properties of the Company, and cause
the Company’s officers, directors, employees, and independent accountants to supply all information reasonably requested by any such seller, underwriter, attorney, accountant, or agent, in each case, as necessary or advisable to verify the
accuracy of the information in such registration statement and to conduct appropriate due diligence in connection therewith; 
 (i) notify
each selling Holder, promptly after the Company receives notice thereof, of the time when such registration statement has been declared effective or a supplement to any prospectus forming a part of such registration statement has been filed; and

 (j) after such registration statement becomes effective, notify each selling Holder of any request by the SEC that the Company amend or
supplement such registration statement or prospectus. 
 In addition, the Company shall ensure that, at all times after any registration
statement covering a public offering of securities of the Company under the Securities Act shall have become effective, its insider trading policy shall provide that the Company’s directors may implement a trading program under Rule 10b5-1 of the Exchange Act. 
 2.5. Furnish Information. It shall be a condition precedent to the
obligations of the Company to take any action pursuant to this Section 2 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 is reasonably required to effect the registration of such Holder’s Registrable Securities. 

2.6. Expenses of Registration. All expenses (other than Selling Expenses) incurred in connection with registrations, filings, or
qualifications pursuant to Section 2, including all registration, filing, and qualification fees; printers’ and accounting fees; fees and disbursements of counsel for the Company; and the reasonable fees and
disbursements of one (1) counsel for the selling Holders (“Selling Holder Counsel”), shall be borne and paid by the Company; provided, 

  
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however, that the Company shall not be required to pay for any expenses of any registration proceeding begun pursuant to Subsection 2.1 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 selling Holders shall bear such expenses pro rata based upon the number of Registrable Securities that were to be
included in the withdrawn registration), unless the Holders of a majority of the Registrable Securities agree to forfeit their right to one (1) registration pursuant to Subsection 2.1(a) or Subsection 2.1(b), as the
case may be; provided further that if, at the time of such withdrawal, the Holders shall 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 after learning of such information, then the Holders shall not be required to pay any of such expenses and shall not forfeit their right to one (1) registration pursuant to
Subsection 2.1(a) or Subsection 2.1(b). All Selling Expenses relating to Registrable Securities registered pursuant to this Section 2 shall be borne and paid by the Holders pro rata on the basis
of the number of Registrable Securities registered on their behalf. 
 2.7. Delay of Registration. No Holder shall have any right to
obtain or seek an injunction restraining or otherwise delaying any registration pursuant to this Agreement as the result of any controversy that might arise with respect to the interpretation or implementation of this
Section 2. 
 2.8. Indemnification. If any Registrable Securities are included in a registration statement
under this Section 2: 
 (a) To the extent permitted by law, the Company will indemnify and hold harmless each
selling Holder, and the partners, members, officers, directors, and stockholders of each such Holder; legal counsel and accountants for each such Holder; any underwriter (as defined in the Securities Act) for each 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 Damages, and the Company will pay to each such Holder, underwriter, controlling Person, or other aforementioned Person any legal
or other expenses reasonably incurred thereby in connection with investigating or defending any claim or proceeding from which Damages may result, as such expenses are incurred; provided, however, that the indemnity agreement contained
in this Subsection 2.8(a) shall not apply to amounts paid in settlement of any such claim 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 for any Damages to the extent that they arise out of or are based upon actions or omissions made in reliance upon and in conformity with written information furnished by or on behalf of any such Holder, underwriter,
controlling Person, or other aforementioned Person expressly for use in connection with such registration. 
 (b) To the extent permitted
by law, each selling Holder, severally and not jointly, will indemnify and hold harmless the Company, and 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 (as defined in the Securities Act), any other Holder selling securities in such registration statement, and any controlling Person of any such
underwriter or other Holder, against any Damages, in each case only to the extent that such Damages arise out of or are based upon actions or omissions made in reliance upon and in conformity with written information furnished

  
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by or on behalf of such selling Holder expressly for use in connection with such registration; and each such selling Holder will pay to the Company and each other aforementioned Person any legal
or other expenses reasonably incurred thereby in connection with investigating or defending any claim or proceeding from which Damages may result, as such expenses are incurred; provided, however, that the indemnity agreement contained
in this Subsection 2.8(b) shall not apply to amounts paid in settlement of any such claim or proceeding if such settlement is effected without the consent of the Holder, which consent shall not be unreasonably withheld; and
provided further that in no event shall the aggregate amounts payable by any Holder by way of indemnity or contribution under Subsections 2.8(b) and 2.8(d) exceed the proceeds from the offering received by such Holder
(net of any Selling Expenses paid by such Holder), except in the case of fraud or willful misconduct by such Holder. 
 (c) Promptly after
receipt by an indemnified party under this Subsection 2.8 of notice of the commencement of any action (including any governmental action) for which a party may be entitled to indemnification hereunder, such indemnified
party will, if a claim in respect thereof is to be made against any indemnifying party under this Subsection 2.8, give the indemnifying party notice of the commencement thereof. The indemnifying party shall have the right to
participate in such action and, to the extent the indemnifying party so desires, participate jointly with any other indemnifying party to which notice has been given, and 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 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 action. The failure to give notice to the indemnifying party within a reasonable time of the commencement of any such action shall relieve such indemnifying party of any liability to the indemnified party
under this Subsection 2.8, to the extent that such failure materially prejudices the indemnifying party’s ability to defend such action. The failure to give notice to the indemnifying party will not relieve it of any liability
that it may have to any indemnified party otherwise than under this Subsection 2.8. 
 (d) To provide for just and equitable
contribution to joint liability under the Securities Act in any case in which either (i) any party otherwise entitled to indemnification hereunder makes a claim for indemnification pursuant to this Subsection 2.8 but it is
judicially determined (by the entry of a final judgment or decree by a court of competent jurisdiction and the expiration of time to appeal or the denial of the last right of appeal) that such indemnification may not be enforced in such case,
notwithstanding the fact that this Subsection 2.8 provides for indemnification in such case, or (ii) contribution under the Securities Act may be required on the part of any party hereto for which indemnification is provided under
this Subsection 2.8, then, and in each such case, such parties will contribute to the aggregate losses, claims, damages, liabilities, or expenses to which they may be subject (after contribution from others) in such proportion as is
appropriate to reflect the relative fault of each of the indemnifying party and the indemnified party in connection with the statements, omissions, or other actions that resulted in such loss, claim, damage, liability, or expense, as well as to
reflect any other relevant equitable considerations. The relative fault of the indemnifying party and of the indemnified party shall be determined by reference to, among other things, whether the untrue or allegedly untrue statement of a material

  
 11 

 
fact, or the omission or alleged omission of 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; provided, however, that, in any such case, (x) no Holder will be required to contribute any amount in excess of the public
offering price of all such Registrable Securities offered and sold by such Holder pursuant to such registration statement, and (y) no Person guilty of fraudulent misrepresentation (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 Subsection 2.8(d), when
combined with the amounts paid or payable by such Holder pursuant to Subsection 2.8(b), exceed the proceeds from the offering received by such Holder (net of any Selling Expenses paid by such Holder), except in the case of
willful misconduct or fraud by such Holder. 
 (e) 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. 

(f) Unless otherwise superseded by an underwriting agreement entered into in connection with the underwritten public offering, the
obligations of the Company and Holders under this Subsection 2.8 shall survive the completion of any offering of Registrable Securities in a registration under this Section 2, and otherwise shall survive the
termination of this Agreement. 
 2.9. Reports Under Exchange Act. With a view to making available to the Holders the benefits of SEC
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 shall: 
 (a) make and keep available adequate current public information, as those terms are understood and defined in SEC Rule
144, at all times after the effective date of the registration statement filed by the Company for the IPO; 
 (b) use commercially
reasonable efforts to 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 (at any time after the Company has become subject to such reporting requirements); and

 (c) furnish to any Holder, so long as the Holder owns any Registrable Securities, forthwith upon request (i) to the extent
accurate, a written statement by the Company that it has complied with the reporting requirements of SEC Rule 144 (at any time after ninety (90) days after the effective date of the registration statement filed by the Company for the IPO), the
Securities Act, and the Exchange Act (at any time after the Company 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 the Company so qualifies); (ii) 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 (iii) such other information as may be reasonably requested
in availing any Holder of any rule or regulation of the SEC that permits the selling of any such securities without registration (at any time after the Company has become subject to the reporting requirements under the Exchange Act) or pursuant to
Form S-3 (at any time after the Company so qualifies to use such form). 

  
 12 

 2.10. Limitations on Subsequent Registration Rights. From and after the date of this
Agreement, the Company shall not, without the prior written consent of the Holders of a majority of the Registrable Securities then outstanding, 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 such securities in any registration unless, under the terms of such agreement, such securities are included in such registration only to the extent that the inclusion of such
securities will not reduce the number of the Registrable Securities of the Holders that are included, or (ii) to initiate a demand for registration of any securities held by such holder or prospective holder; provided that this
limitation shall not apply (a) to any additional Investor who becomes a party to this Agreement in accordance with Subsection 6.9. 

2.11. “Market Stand-off” Agreement. Each Holder 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 registration by the Company of shares of its Common Stock or any other equity
securities under the Securities Act on a registration statement on Form S-1 or Form S-3 and ending on the date specified by the Company and the managing underwriter (such period not to exceed one hundred
eighty (180) days in the case of the IPO, or such other period not to exceed an additional thirty-five (35) days as may be requested by the Company or an underwriter to accommodate regulatory restrictions on (1) the publication or
other distribution of research reports and (2) analyst recommendations and opinions, including, but not limited to, the restrictions contained in FINRA Rule 2711(f)(4) or NYSE Rule 472(f)(4), or any successor provisions or amendments thereto),
(i) 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 (directly or indirectly) for Common Stock held immediately before the effective date of the registration statement for such offering or (ii) enter into any
swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of such securities, whether any such transaction described in clause (i) or (ii) above is to be settled by delivery of
Common Stock or other securities, in cash, or otherwise. The foregoing provisions of this Subsection 2.11 shall apply only to the IPO, shall not apply to any shares of Common Stock purchased after the registration statement is declared
effective for such offering, shall not apply to the sale of any shares to an underwriter pursuant to an underwriting agreement, or the transfer of any shares to any Affiliates, regardless of whether or not such transfer is for consideration, or to
any trust for the direct or indirect benefit of the Holder or the immediate family of the Holder or transfers to Affiliates of Holders regardless of whether or not such transfer is for consideration, provided that the trustee of the trust
agrees to be bound in writing by the restrictions set forth herein, and provided further that any such transfer shall not violate any restrictions set forth herein, and shall be applicable to the Holders only if all officers, directors
and stockholders individually owning more than one percent (1%) of the Company’s outstanding Common Stock (after giving effect to conversion into Common Stock of all outstanding Series D Preferred Stock) are subject to the same restrictions.
The underwriters in connection with such registration are intended third-party beneficiaries of this Subsection 2.11 and shall have the right, power, and authority to enforce the provisions
hereof as 

  
 13 

 
though they were a party hereto. Each Holder further agrees to execute such agreements as may be reasonably requested by the underwriters in connection with such registration that are consistent
with this Subsection 2.11 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 pro rata to all
Holders subject to such agreements, based on the number of shares subject to such agreements. Any release of Common Stock or any other equity securities of Holders subject to this Subsection 2.11 shall be on a pro rata basis. 

2.12. Restrictions on Transfer. 

(a) The Series D Preferred Stock and the Registrable Securities shall not be sold, pledged, or otherwise transferred, and the Company shall
not recognize and shall issue stop-transfer instructions to its transfer agent with respect to any such sale, pledge, or transfer, except upon the conditions specified in this Agreement, which conditions are intended to ensure compliance with the
provisions of the Securities Act. A transferring Holder will cause any proposed purchaser, pledgee, or transferee of the Series D Preferred Stock and the Registrable Securities held by such Holder to agree to take and hold such securities subject to
the provisions and upon the conditions specified in this Agreement. 
 (b) Each certificate or instrument representing (i) the Series
D Preferred Stock, (ii) the Registrable Securities, and (iii) any other securities issued in respect of the securities referenced in clauses (i) and (ii), upon any stock split, stock dividend, recapitalization, merger, consolidation,
or similar event, shall (unless otherwise permitted by the provisions of Subsection 2.12(c)) be stamped or otherwise imprinted with a legend substantially in the following form: 

THE SECURITIES REPRESENTED HEREBY HAVE BEEN ACQUIRED FOR INVESTMENT AND HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF
1933, AS AMENDED. SUCH SHARES MAY NOT BE SOLD, PLEDGED, OR TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR A VALID EXEMPTION FROM THE REGISTRATION AND PROSPECTUS DELIVERY REQUIREMENTS OF SAID ACT. 

THE SECURITIES REPRESENTED HEREBY 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. 
 The Holders consent to the Company making a notation in
its records and giving instructions to any transfer agent of the Restricted Securities in order to implement the restrictions on transfer set forth in this Subsection 2.12. 

(c) The holder of each certificate representing Restricted Securities, by acceptance of ownership thereof, agrees to comply in all respects
with the provisions of this Section 2. Before any proposed sale, pledge, or transfer of any Restricted Securities, unless there is in effect a registration statement under the Securities Act covering the proposed
transaction, the 

  
 14 

 
Holder thereof shall give notice to the Company of such Holder’s intention to effect such sale, pledge, or transfer. Each such notice shall describe the manner and circumstances of the
proposed sale, pledge, or transfer in sufficient detail and, if reasonably requested by the Company, shall be accompanied at such Holder’s expense by either (i) a written opinion of legal counsel who shall, and whose legal opinion shall,
be reasonably satisfactory to the Company, addressed to the Company, to the effect that the proposed transaction may be effected without registration under the Securities Act; (ii) a “no action” letter from the SEC to the effect that
the proposed sale, pledge, or transfer of such Restricted Securities without registration will not result in a recommendation by the staff of the SEC that action be taken with respect thereto; or (iii) any other evidence reasonably satisfactory
to counsel to the Company to the effect that the proposed sale, pledge, or transfer of the Restricted Securities may be effected without registration under the Securities Act, whereupon the Holder of such Restricted Securities shall be entitled to
sell, pledge, or transfer such Restricted Securities in accordance with the terms of the notice given by the Holder to the Company. The Company will not require such a legal opinion or “no action” letter (x) in any transaction in
compliance with SEC Rule 144 or (y) in any transaction in which such Holder distributes Restricted Securities to an Affiliate of such Holder for no consideration; provided, that each transferee agrees in writing to be subject to the
terms of this Subsection 2.12. Each certificate, instrument or book entry evidencing the Restricted Securities transferred as above provided shall bear, except if such transfer is made pursuant to SEC Rule 144, the appropriate restrictive
legend set forth in Subsection 2.12(b), except that such certificate, instrument or book entry shall not bear such restrictive legend if, in the opinion of counsel for such Holder and the Company, such legend is not required in order to
establish compliance with any provisions of the Securities Act. 
 (d) Notwithstanding the provisions of Subsections 2.12(a) and
2.12(c) above, no such registration statement or opinion of counsel or “no action” letter shall be necessary for: (A) a transfer of Restricted Securities by a Holder to any of its Affiliates, (B) a transfer of Restricted
Securities by a Holder that is a partnership, limited liability company or corporation to a partner, limited partner, retired partner, member, retired member or stockholder of a Holder; (C) a transfer of Restricted Securities to a charity;
(D) a transfer of Restricted Securities by gift, will or intestate succession of any partner to his or her spouse or to the siblings, lineal descendants or ancestors of such partner or his or her spouse; or (E) the transfer of Restricted
Securities by a Holder exercising its co-sale rights under that certain Right of First Refusal and Co-Sale Agreement by and among the Company and the Investors and
Common Holders named therein of even date herewith, as amended (the “Right of First Refusal and Co-Sale Agreement”), if in each transfer under clauses (A), (B), (C) or (D) the prospective
transferee agrees in all such instances in writing to be subject to the terms hereof to the same extent as if he or she were an original Holder hereunder. 

2.13. Termination of Registration Rights. The right of any Holder to request registration or inclusion of Registrable Securities in any
registration pursuant to Subsection 2.1 or Subsection 2.2 shall terminate upon the earlier to occur of: 
 (a)
the closing of a Deemed Liquidation Event (other than an Asset Sale), as such terms are defined in the Certificate of Incorporation, under which the transaction consideration is solely cash (or cash and cash
earn-out payments) or marketable securities; 

  
 15 

 (b) such time as Rule 144 or another similar exemption under the Securities Act is
available for the sale of all of such Holder’s shares without limitation during a three-month period without registration; and 
 (c)
the fifth (5) year anniversary of the IPO. 
 2.14. Foreign Country IPO. In the case of an IPO in a country other than the
United States, the Company and the Investors agree that, prior to the closing of such IPO, the Company and the Investors shall negotiate in good faith to reasonably agree to amend this Agreement to bring its provisions in conformity with the
applicable laws and generally accepted market practice for registration rights in the applicable country of such IPO. 
 3.
Information and Observer Rights. 
 3.1. Delivery of Financial Statements. The Company shall deliver to each
Major Investor, provided the Board has not reasonably determined that such Major Investor is a competitor of the Company (provided that none of Farallon Capital Management, L.L.C. or any of its Affiliates (collectively, “Farallon”)
shall be deemed to be a competitor of the Company): 
 (a) as soon as practicable, but in any event within ninety (90) days after the
end of each fiscal year of the Company, (i) a balance sheet as of the end of such year, (ii) statements of income and of cash flows for such year, and a comparison between (x) the actual amounts as of and for such fiscal year and
(y) the comparable amounts for the prior year and as included in the Budget (as defined below) for such year, with an explanation of any material differences between such amounts and a schedule as to the sources and applications of funds for
such year, and (iii) a statement of stockholders’ equity as of the end of such year, all such financial statements audited and certified by independent public accountants of nationally recognized standing selected by the Company; 

(b) 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, unaudited statements of income and of cash flows for such fiscal quarter, and an unaudited balance sheet and a statement of stockholders’ equity as of the end of such fiscal quarter, all prepared in accordance
with GAAP (except that such financial statements may (i) be subject to normal year-end audit adjustments and (ii) not contain all notes thereto that may be required in accordance with GAAP); 

(c) as soon as practicable, but in any event within thirty (30) days after the end of each month, an unaudited statement of income and
statement of cash flows for such month, and an unaudited balance sheet and statement of stockholders’ equity as of the end of such month, all prepared in accordance with GAAP (except that such financial statements may (i) be subject to
normal year-end audit adjustments and (ii) not contain all notes thereto that may be required in accordance with GAAP); 

(d) 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, 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 

  
 16 

 
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 Major Investors to calculate their respective percentage equity ownership in the Company, and certified by the chief financial officer or chief executive officer of the Company as being true, complete, and
correct; 
 (e) as soon as practicable, but in any event thirty (30) days before the end of each fiscal year, a budget and business
plan for the next fiscal year (collectively, the “Budget”), approved by the Board, including the approval of at least two (2) of the Series D Directors, and prepared on a monthly basis, including balance sheets, income
statements, and statements of cash flow for such months and, promptly after prepared, any other budgets or revised budgets prepared by the Company; and 

(f) such other information relating to the financial condition, business, prospects, or corporate affairs of the Company as any Major
Investor may from time to time reasonably request; provided, however, that the Company shall not be obligated under this Subsection 3.1 to provide information (i) that the Company reasonably determines in good faith
to be a trade secret or confidential information (unless covered by an enforceable confidentiality agreement, in form acceptable to the Company); or (ii) the disclosure of which would adversely affect the attorney-client privilege between the
Company and its counsel. 
 If, for any period, the Company has any subsidiary whose accounts are consolidated with those of the Company,
then in respect of such period the financial statements delivered pursuant to the foregoing sections shall be the consolidated and consolidating financial statements of the Company and all such consolidated subsidiaries.

Notwithstanding anything else in this Subsection 3.1 to the contrary, the Company may cease providing the information set forth
in this Subsection 3.1 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 Subsection 3.1 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. 
 3.2. Inspection. The Company shall
permit each Major Investor (provided that the Board has not reasonably determined that such Major Investor is a competitor of the Company), at such Major Investor’s expense, to visit and inspect the Company’s properties; examine its
books of account and records; and discuss the Company’s affairs, finances, and accounts with its officers, during normal business hours of the Company as may be reasonably requested by the Major Investor; provided, however, that
the Company shall not be obligated pursuant to this Subsection 3.2 to provide access to any information that it reasonably and in good faith considers to be a trade secret or confidential information (unless covered by an
enforceable confidentiality agreement, in form acceptable to the Company) or the disclosure of which would adversely affect the attorney-client privilege between the Company and its counsel. 

  
 17 

 3.3. Observer Rights. 

(a) As long as Soleus owns not less than twenty-five percent (25%) of the shares of the Series D Preferred Stock it is purchasing under the
Purchase Agreement (or an equivalent amount of Common Stock issued upon conversion thereof), the Company shall invite a representative of Soleus to attend all meetings of the 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 at the same time and in the same manner as provided to such directors; provided, however, that such representative
shall agree to hold in confidence and trust and to act in a fiduciary manner 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 or result in disclosure of trade secrets or a conflict of interest,
or if such Investor or its representative is a competitor of the Company. 
 (b) As long as HBM owns not less than twenty-five percent
(25%) of the shares of the Series D Preferred Stock it is purchasing under the Purchase Agreement (or an equivalent amount of Common Stock issued upon conversion thereof), the Company shall invite a representative of HBM to attend all meetings of
the 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 at the same time and in the same manner as provided to
such directors; provided, however, that such representative shall agree to hold in confidence and trust and to act in a fiduciary manner 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 or result in disclosure of trade secrets or a conflict of interest, or if such Investor or its representative is a competitor of the Company. 

(c) As long as Farallon owns not less than twenty-five percent (25%) of the shares of the Series D Preferred Stock it is purchasing under the
Purchase Agreement (or an equivalent amount of Common Stock issued upon conversion thereof), the Company shall invite a representative of Farallon to attend all meetings of the 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 at the same time and in the same manner as provided to such directors; provided, however, that such representative
shall agree to hold in confidence and trust and to act in a fiduciary manner 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 or result in disclosure of trade secrets or a conflict of interest.

 3.4. Termination of Information and Observer Rights. The covenants set forth in Subsections 3.1, 3.2
and 3.3 shall terminate and be of no further force or effect (i) immediately before the consummation of the IPO, (ii) when the Company first becomes subject to the periodic reporting requirements of Section 12(g) or 15(d) of
the Exchange Act, or (iii) upon a Deemed Liquidation Event (other than an Asset Sale), as such terms are defined in the Certificate of Incorporation, whichever event occurs first. 

  
 18 

 3.5. Confidentiality. Each Investor agrees that such Investor will keep confidential
and will not disclose, divulge, or use for any purpose (other than to monitor its investment in the Company) any confidential information obtained from the Company pursuant to the terms of this Agreement (including notice of the Company’s
intention to file a registration statement), unless such confidential information (a) is known or becomes known to the public in general (other than as a result of a breach of this Subsection 3.5 by such Investor), (b) is or has been
independently developed or conceived by the Investor without use of the Company’s confidential information, or (c) is or has been made known or disclosed to the Investor by a third party without a breach of any obligation of
confidentiality such third party may have to the Company; provided, however, that an Investor may disclose confidential information (i) to its attorneys, accountants, consultants, and other professionals to the extent necessary to
obtain their services in connection with monitoring its investment in the Company; (ii) to any prospective purchaser of any Registrable Securities from such Investor, if such prospective purchaser agrees to be bound by the provisions of this
Subsection 3.5; (iii) to any existing or prospective Affiliate, partner, member, stockholder, or wholly owned subsidiary of such Investor in the ordinary course of business, provided that such Investor informs such Person that such
information is confidential and directs such Person to maintain the confidentiality of such information; (iv) as may otherwise be required by law, provided that if such disclosure required by law is specifically directed at the
Company, the Investor promptly notifies the Company of such disclosure and takes reasonable steps to minimize the extent of any such required disclosure; (v) in connection with such Investor’s ordinary course of reporting to its investors;
provided that such Investor informs such Person that such information is confidential and directs such Person to maintain the confidentiality of such information; or (vi) to the extent required in connection with any routine or periodic
examination or similar process by any regulatory or self-regulatory body or authority not specifically directed at the Company. 
 3.6.
IPO Participation Rights. In the event that any Investor then holding at least five percent (5%) of the Series D Preferred Stock then outstanding (an “Eligible Investor”) indicates an interest to purchase shares of Common
Stock in the Company’s IPO, the Company shall use its commercially reasonable efforts to cause the managing underwriter or underwriters of such IPO to offer such Eligible Investor the opportunity to purchase at the price to the public, and on
the same terms, the number of shares of Common Stock equal to $15,000,000 divided by the price per share to the public in the IPO (with respect to each electing Eligible Investor, its “IPO Allocation”). Notwithstanding the
foregoing, any such Eligible Investor acknowledges that the sale of any shares of Common Stock to any person in the IPO will only be made in compliance with all federal and state securities laws, including, without limitation, the Securities Act of
1933, as amended, and all applicable rules and regulations promulgated by the Financial Industry Regulatory Authority (FINRA) and such other self-regulatory organizations as may be applicable in connection with the IPO or have authority over the
participants therein. Any such Eligible Investor further acknowledges that, despite the Company’s use of its commercially reasonable efforts, the managing underwriter or underwriters in their reasonable discretion may reduce each Eligible
Investor’s IPO Allocation if such underwriter(s) determine that granting the full IPO Allocation to each Eligible Investor that elects to participate may materially and adversely impact the success of the IPO. 

  
 19 

 4. Rights to Future Stock Issuances. 

4.1. Right of First Offer. Subject to the terms and conditions of this Subsection 4.1 and applicable
securities laws, if the Company proposes to offer or sell any New Securities, the Company shall first offer such New Securities to each Major Investor. A Major Investor shall be entitled to apportion the right of first offer hereby granted to it in
such proportions as it deems appropriate, among (i) itself and (ii) its Affiliates; provided that each such Affiliate agrees to enter into this Agreement and each of the Voting Agreement and Right of First Refusal and Co-Sale Agreement, as an “Investor” under each such agreement. 
 (a) The Company shall give
notice (the “Offer Notice”) to each Major Investor, stating (i) its bona fide intention to offer such New Securities, (ii) the number of such New Securities to be offered, and (iii) the price and terms, if any, upon
which it proposes to offer such New Securities. 
 (b) By notification to the Company within twenty (20) days after the Offer Notice
is given, each Major Investor may elect to purchase or otherwise acquire, at the price and on the terms specified in the Offer Notice, up to that portion of such New Securities which equals the proportion that the Common Stock then held by such
Major Investor (including all shares of Common Stock then issuable (directly or indirectly) upon conversion and/or exercise, as applicable, of the Series D Preferred Stock and any other Derivative Securities then held by such Major Investor) bears
to the total Common Stock of the Company then outstanding (assuming full conversion and/or exercise, as applicable, of all Series D Preferred Stock and any other Derivative Securities then outstanding). At the expiration of such twenty
(20) day period, the Company shall promptly notify each Major Investor that elects to purchase or acquire all the shares available to it (each, a “Fully Exercising Investor”) of any other Major Investor’s failure to do
likewise. During the ten (10) day period commencing after the Company has given such notice, each Fully Exercising Investor may, by giving notice to the Company, elect to purchase or acquire, in addition to the number of shares specified above,
up to that portion of the New Securities for which Major Investors were entitled to subscribe but that were not subscribed for by the Major Investors which is equal to the proportion that the Common Stock issued and held, or issuable (directly or
indirectly) upon conversion and/or exercise, as applicable, of Series D Preferred Stock and any other Derivative Securities then held, by such Fully Exercising Investor bears to the Common Stock issued and held, or issuable (directly or indirectly)
upon conversion and/or exercise, as applicable, of the Series D Preferred Stock and any other Derivative Securities then held, by all Fully Exercising Investors who wish to purchase such unsubscribed shares. The closing of any sale pursuant to this
Subsection 4.1(b) shall occur within the later of ninety (90) days of the date that the Offer Notice is given and the date of initial sale of New Securities pursuant to Subsection 4.1(c). 

(c) If all New Securities referred to in the Offer Notice are not elected to be purchased or acquired as provided in Subsection
4.1(b), the Company may, during the ninety (90) day period following the expiration of the periods provided in Subsection 4.1(b), offer and sell the remaining unsubscribed portion of such New Securities to any Person or Persons at a
price not less than, and upon terms no more favorable to the offeree than, those specified in the Offer Notice. If the Company does not enter into an agreement for the sale of the New Securities within such period, or if such agreement is not
consummated within thirty (30) days of the execution thereof, the right provided hereunder shall be deemed to be revived and such New Securities shall not be offered unless first reoffered to the Major Investors in accordance with this
Subsection 4.1(c). 

  
 20 

 (d) The right of first offer in this Subsection 4.1 shall not be applicable to
(i) Exempted Securities (as defined in the Certificate of Incorporation); and (ii) shares of Common Stock issued in the IPO; and (iii) the issuance of shares of Series D Preferred Stock to Additional Purchasers pursuant to
Subsection 1.3 of the Purchase Agreement. 
 5. Additional Covenants. 

5.1. Insurance. The Company shall obtain within ninety (90) days of the date hereof, and maintain in full force and effect,
(a) Directors and Officers liability insurance in an amount of at least Five Million Dollars ($5,000,000), covering such risks as are adequate and customary for its size and business, and (b) term
“key-person” insurance on such individual or individuals designated by the Board from financially sound and reputable insurers, each in an amount and on terms and conditions satisfactory to the
Board, including the Series D Directors, and will use commercially reasonable efforts to cause such insurance policies to be maintained until such time as the Board determines that such insurance should be discontinued. The key-person policy or policies shall name the Company as loss payee, and no policy shall be cancelable by the Company without the prior approval of the Board, including the approval of the Soleus Director and the HBM
Director. 
 5.2. Employee Agreements. The Company will cause (i) each person now or hereafter employed by it or by any
subsidiary (or engaged by the Company or any subsidiary as a consultant/independent contractor) with access to confidential information and/or trade secrets to enter into a nondisclosure and proprietary rights assignment agreement and (ii) each
Key Employee to enter into a one (1) year noncompetition and nonsolicitation agreement, substantially in the form approved by the Board, including the approval of the Soleus Director and the HBM Director. In addition, the Company shall not
materially amend, modify, terminate, waive, or otherwise alter, in whole or in part, any of the above-referenced agreements or any restricted stock agreement between the Company and any employee, without the approval by the Board, including the
approval of the Soleus Director and the HBM Director. 
 5.3. Employee Stock. Unless otherwise approved by the Board,
including the approval of at least two (2) of the Series D Directors, all future employees and consultants of the Company who purchase, receive options to purchase, or receive awards of shares of the Company’s capital stock after the date
hereof shall be required to execute restricted stock or option agreements, as applicable, providing for (i) vesting of shares over a four (4) year period, with the first twenty-five percent (25%) of such shares vesting following one
(1) year of continued employment or service, and the remaining shares vesting in equal monthly installments over the following thirty-six (36) months, and (ii) a market stand-off provision substantially similar to that in Subsection 2.11. In addition, unless otherwise approved by the Board, the Company shall retain a “right of first refusal” on employee
transfers until the Company’s IPO and shall have the right to repurchase unvested shares at cost upon termination of employment of a holder of restricted stock. 

  
 21 

 5.4. Matters Requiring Investor Director Approval. The Company hereby covenants and
agrees with each of the Investors that it shall not, without approval of the Board, which approval (for so long as Soleus is entitled to elect the Soleus Director) must include the affirmative vote of the Soleus Director or (for so long as HBM is
entitled to elect the HBM Director) must include the affirmative vote of the HBM Director: 
 (a) make, or permit any subsidiary to make,
any loan or advance to, or own any stock or other securities of, any subsidiary or other corporation, partnership, or other entity unless it is wholly owned by the Company; 

(b) make, or permit any subsidiary to make, any loan or advance to any Person, including, without limitation, any employee or director of the
Company or any subsidiary, except advances and similar expenditures in the ordinary course of business or under the terms of an employee stock or option plan approved by the Board; 

(c) guarantee, directly or indirectly, or permit any subsidiary to guarantee, directly or indirectly, any indebtedness except for trade
accounts of the Company or any subsidiary arising in the ordinary course of business; 
 (d) make any investment inconsistent with any
investment policy approved by the Board; 
 (e) incur any new indebtedness for borrowed money that, together with any other indebtedness
for borrowed money incurred following the date hereof, exceeds $250,000 in the aggregate; 
 (f) pay or declare any dividend or
distribution on any shares of capital stock of the Company, or apply any assets to the redemption, retirement, purchase or acquisition, directly or indirectly, through subsidiaries or otherwise, of any shares of capital stock of the Company, except
for (i) the repurchase by the Company of capital stock held by an employee, director or consultant of the Company at the original purchase price upon termination of their employment or services with the Company, or (ii) as contemplated by
the Certificate of Incorporation or by the Right of First Refusal and Co-Sale Agreement; 
 (g)
change the principal business of the Company, enter new lines of business, or exit the current line of business; 
 (h) sell, assign,
license, pledge or encumber material technology or intellectual property, other than licenses granted in the ordinary course of business; 

(i) enter into or be a party to any transaction with any director, officer or employee of the Company or any “associate” (as
defined in Rule 12b-2 promulgated under the Exchange Act); 
 (j) hire, fire, or change in any
material respect the compensation of the executive officers, including approving any option grants; 
 (k) enter into any corporate
strategic relationship involving the payment, contribution or assignment by the Company or to the Company of assets greater than $250,000; or 

  
 22 

 (l) waive, amend, modify or settle any claims arising from, or take any other actions
relating to, the business arrangements, agreements, disputes, claims, proceedings or dealings between the Company and BeiGene, Ltd., a Cayman Islands corporation or any of its Affiliates; provided that any such waiver, amendment, modification,
settlement or the taking of any other actions shall require the affirmative vote of at least two (2) of the Series D Directors. 
 5.5.
Board Matters. Unless otherwise determined by the vote of a majority of the directors then in office, the Board shall meet at least quarterly in accordance with an agreed-upon schedule. The Company shall reimburse the nonemployee directors
for all reasonable out-of-pocket travel expenses incurred (consistent with the Company’s travel policy) in connection with attending meetings of the Board. Each non-employee director shall be entitled in such person’s discretion to be a member of any committee of the Board. The board of directors of each subsidiary of the Company (if any) shall have the same
composition as the Board, unless otherwise agreed by each of Soleus and HBM. 
 5.6. Successor Indemnification. If the Company or any
of its successors or assignees consolidates with or merges into any other Person and is not the continuing or surviving corporation or entity of such consolidation or merger, then to the extent necessary, proper provision shall be made so that the
successors and assignees of the Company assume the obligations of the Company with respect to indemnification of members of the Board as in effect immediately before such transaction, whether such obligations are contained in the Company’s
Bylaws, the Certificate of Incorporation, or elsewhere, as the case may be. 
 5.7. Indemnification Matters. The Company hereby
acknowledges that one (1) or more of the directors nominated to serve on the Board by the Investors (each a “Fund Director”) may have certain rights to indemnification, advancement of expenses and/or insurance provided by one
or more of the Investors and certain of their affiliates (collectively, the “Fund Indemnitors”). The Company hereby agrees (a) that it is the indemnitor of first resort (i.e., its obligations to any such Fund Director
are primary and any obligation of the Fund Indemnitors to advance expenses or to provide indemnification for the same expenses or liabilities incurred by such Fund Director are secondary), (b) that it shall be required to advance the full amount of
expenses incurred by such Fund Director and shall be liable for the full amount of all expenses, judgments, penalties, fines and amounts paid in settlement by or on behalf of any such Fund Director to the extent legally permitted and as required by
the Certificate of Incorporation or the Company’s Bylaws (or any agreement between the Company and such Fund Director), without regard to any rights such Fund Director may have against the Fund Indemnitors, and, (c) that it irrevocably
waives, relinquishes and releases the Fund Indemnitors from any and all claims against the Fund Indemnitors for contribution, subrogation or any other recovery of any kind in respect thereof. The Company further agrees that no advancement or
payment by the Fund Indemnitors on behalf of any such Fund Director with respect to any claim for which such Fund Director has sought indemnification from the Company shall affect the foregoing and the Fund Indemnitors shall have a right of
contribution and/or be subrogated to the extent of such advancement or payment to all of the rights of recovery of such Fund Director against the Company. 

  
 23 

 5.8. Right to Conduct Activities. The Company hereby agrees and acknowledges that
the Investors (together with their Affiliates) are in the business of venture capital and/or private equity investing, review the business plans and related proprietary information of, and invest in, many enterprises, including enterprises which
may have products or services which compete directly or indirectly with those of the Company (as currently conducted or as currently proposed to be conducted). The Company hereby agrees that, to the extent permitted under applicable law,
(A) nothing in this Agreement shall preclude or in any way restrict any Investor (or its Affiliates) from investing or participating in any particular enterprise whether or not such enterprise has products or services which compete with those
of the Company and (B) each Investor (and its Affiliates) shall not be liable to the Company for any claim arising out of, or based upon, (i) the investment by such Investor (or its Affiliates) in any entity competitive with the Company,
or (ii) actions taken by any partner, officer or other representative of such Investor (or its Affiliates) to assist any such competitive company, whether or not such action was taken as a member of the board of directors of such competitive
company or otherwise, and whether or not such action has a detrimental effect on the Company; provided, however, that the foregoing shall not relieve (x) any of the Investors from liability associated with the unauthorized
disclosure of the Company’s confidential information obtained pursuant to this Agreement, or (y) any director or officer of the Company from any liability associated with his or her fiduciary duties to the Company. The Company and each
Investor acknowledge and agree that certain of the Investors or their Affiliates may presently have, or may engage in the future in, internal development programs, or may receive information from third parties that relates to, and may develop and
commercialize products independently or in cooperation with such third parties, that are similar to or that are directly or indirectly competitive with, the Company’s development programs, products or services. Nothing in this Agreement or any
other agreement related to the transactions contemplated by this Agreement, shall in any way preclude or restrict such Investors or their Affiliates from conducting any development program, commercializing any product or service or otherwise
engaging in any enterprise, whether or not such development program, product, service or enterprise, competes with those of the Company, so long as such activities do not result in a violation of the confidentiality provisions of this Agreement.

 5.9. FCPA Compliance. The Company shall not, and shall not permit any of its subsidiaries and Affiliates or any of its or their
respective directors, officers, managers, employees, independent contractors, representatives or agents (collectively, “Representatives”) to, promise, authorize or make any payment to, or otherwise contribute any item of value to,
directly or indirectly, any non-U.S. government official, in each case, in violation of the U.S. Foreign Corrupt Practices Act (the “FCPA”) or any other applicable anti-bribery or
anti-corruption law. The Company shall, and shall cause each of its subsidiaries and Affiliates to, cease all of its or their respective activities, as well as remediate any actions taken by the Company, its subsidiaries or Affiliates or any of its
or their respective Representatives in violation of the FCPA or any other applicable anti-bribery or anti-corruption law. The Company shall, and shall cause each of its Affiliates and subsidiaries to, maintain systems or internal controls
(including, but not limited to, accounting systems, purchasing systems and billing systems) to ensure compliance with the FCPA or any other applicable anti-bribery or anti-corruption law. 

5.10. Marketing Efforts. Each of Soleus, HBM and Farallon shall be permitted to disclose the fact of its investment in the Company,
along with investment amount and a description of the business of the Company, in any of Soleus’, HBM’s or Farallon’s (as applicable) general marketing efforts. 

  
 24 

 5.11. Additional Classes of Stock. Prior to the filing of any registration statement
in connection with the IPO, the Company shall use commercially reasonable efforts to amend its Certificate of Incorporation as follows: (a) to authorize the issuance of an additional class of non-voting
common stock (the “Non-Voting Common Stock”) into which shares of Series D Preferred Stock may be converted in the sole discretion of each holder of shares of Series D Preferred Stock; and
(b) to provide pursuant to the Certificate of Incorporation that each holder of shares of Non-Voting Common Stock shall have the right to convert each share of
Non-Voting Common Stock held by such holder into one share of Common Stock at such holder’s election, which shall be made upon written notice to the Company
delivered as provided in the Certificate of Incorporation, provided that, following the closing of the IPO, the shares of Non-Voting Common Stock may only be converted into shares of Common Stock during such
time or times as immediately prior to or as a result of such conversion would not result in the holder(s) thereof beneficially owning (for purposes of Section 13(d) of the Exchange Act), when aggregated with Affiliates with whom such
holder is required to aggregate beneficial ownership for purposes of Section 13(d) of the Exchange Act, in excess of the Beneficial Ownership Limitation. The “Beneficial Ownership Limitation” means initially 4.99% of any class
of securities of the Company registered under the Exchange Act, which percentage may be increased or decreased by a holder of outstanding shares of the Non-Voting Common Stock to such other percentage as such
holder may designate in writing upon 61 days’ notice (delivered as provided in the Certificate of Incorporation) to the Company, provided, however, that such increase or decrease shall only be applicable to such holder and provided further,
however, that no holder may make such an election to change the percentage unless all holders managed by the same investment advisor as such electing holder make the same election. 

5.12. Himalaya Covenants. Each Key Holder hereby agrees that it will not, acting alone or in concert, whether or not such Key Holder
owns Common Stock or Series D Preferred Stock directly or indirectly through Himalaya Parent LLC (“Himalaya”) or any other entity, act or authorize any action that is in contravention with the terms, conditions and covenants of this
Agreement, the Voting Agreement and the Right of First Refusal and Co-Sale Agreement, including, but not limited to, the transfer restrictions in Subsection 2.12 hereof. Himalaya shall not cause or
permit any membership interest in Himalaya to be sold, pledged or otherwise transferred, whether such transfer would occur directly or as a matter of law, other than in accordance with the Limited Liability Company Operating Agreement of Himalaya,
or cause or permit a Change of Control of Himalaya Parent to occur. For purposes of this Subsection 5.11, the definition of “Change of Control” means either (i) the sale, lease, transfer, conveyance or other disposition, in one
or a series of related transactions, of all or substantially all of the business or assets of Himalaya (other than distributions to unitholders contemplated by the Limited Liability Company Operating Agreement of Himalaya) or (ii) a transaction
or series of transactions (including by way of merger, consolidation, recapitalization, reorganization or sale of stock or units), the result of which is that the members of Himalaya immediately prior to such transaction are, after giving effect to
such transaction, no longer, in the aggregate, the “beneficial owners” (as such term is defined in Rule 13d-3 and Rule 13d-5 promulgated under the Exchange
Act), directly or indirectly through one or more intermediaries, of more than 50% of the voting power of the outstanding voting securities of the surviving entity of such transaction; provided, however, in no event will an equity financing
transaction for capital raising purposes in which Himalaya is the surviving corporation or a transaction, the primary purpose of which is to change Himalaya’s corporate form or jurisdiction of incorporation, be deemed to be a Change of Control.
Himalaya 

  
 25 

 
shall not distribute any Common Stock to any Class A Member, Class B Member, or Class C Member that would cause any such member to become a holder of 1% of the Common Stock (on a
fully diluted basis) unless such holder agrees to become party to this Agreement, the Voting Agreement and the Right of First Refusal and Co-Sale Agreement as a “Key Holder” by executing and
delivering a counterpart signature page to each such agreement. 
 5.13. Termination of Covenants. The covenants set forth in this
Section 5, except for Subsections 5.6 and 5.7, shall terminate and be of no further force or effect (i) immediately before the consummation of the IPO, (ii) when the Company first becomes subject to
the periodic reporting requirements of Section 12(g) or 15(d) of the Exchange Act, or (iii) upon a Deemed Liquidation Event (other than an Asset Sale), as such terms are defined in the Certificate of Incorporation, whichever event occurs
first. 
 6. Miscellaneous. 

6.1. Successors and Assigns. The rights under this Agreement may be assigned (but only with all related obligations) by a Holder to a
transferee of Registrable Securities (for so long as such shares remain Registrable Securities) that (i) is an Affiliate of a Holder, (ii) is a subsidiary, parent, general partner, limited partner, retired partner, member or retired member
of a Holder that is a corporation, partnership or limited liability company; (iii) is, if applicable, a Holder’s Immediate Family Member or trust for the benefit of an individual Holder or one or more of such Holder’s Immediate Family
Members; or (iv) after such transfer, holds at least five percent (5%) of the then-outstanding shares of Registrable Securities (subject to appropriate adjustment for stock splits, stock dividends, combinations, and other recapitalizations)
originally held by such Holder; provided, however, that (x) the Company is, within ten (10) days after such transfer, furnished with written notice of the name and address of such transferee and the Registrable Securities
with respect to which such rights are being transferred; and (y) such transferee agrees in a written instrument delivered to the Company to be bound by and subject to the terms and conditions of this Agreement, including the provisions of
Subsection 2.11. For the purposes of determining the number of shares of Registrable Securities held by a transferee, the holdings of a transferee (1) that is an Affiliate or stockholder of a Holder; (2) who is a Holder’s
Immediate Family Member; or (3) that is, if applicable, a trust for the benefit of an individual Holder or such Holder’s Immediate Family Member shall be aggregated together and with those of the transferring Holder; provided
further that all transferees who would not qualify individually for assignment of rights shall have a single attorney-in-fact for the purpose of exercising any
rights, receiving notices, or taking any action under this Agreement. Except as otherwise expressly provided herein, the terms and conditions of this Agreement shall inure to the benefit of and are binding and enforceable upon the respective
successors and permitted assignees of the parties. Nothing in this Agreement, express or implied, is intended to confer upon any party other than the parties hereto or their respective successors and permitted assignees any rights, remedies,
obligations or liabilities under or by reason of this Agreement, except as expressly provided herein. All or any part of the rights, obligations and interests in and to the Registrable Securities of any Investor under this Agreement may be assigned,
at any time and from time to time, to any transferee (x) that is an Affiliate of such Investor or (y) where such transfer takes place in the context of a distribution in-kind, to one or more of such
Investor’s investors, if applicable; provided, however that the Company is, within a reasonable amount of time after such transfer, furnished with written notice of the name and address of such transferee. 

  
 26 

 6.2. Governing Law. This Agreement and any controversy arising out of or relating to
this Agreement shall be governed by and construed in accordance with the General Corporation Law of the State of Delaware as to matters within the scope thereof, and as to all other matters shall be governed by and construed in accordance with the
internal laws of the State of Delaware, without regard to its principles of conflicts of laws. 
 6.3. Counterparts. This
Agreement may be executed in two (2) or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument. Counterparts may be delivered via facsimile, 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 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. 
 6.4. Titles and Subtitles. The titles and subtitles used in this Agreement are for
convenience only and are not to be considered in construing or interpreting this Agreement. 
 6.5. Notices. All notices and other
communications given or made pursuant to this Agreement shall be in writing and shall be deemed effectively given upon the earlier of actual receipt or: (i) personal delivery to the party to be notified; (ii) when sent, if sent by
electronic mail or facsimile during the recipient’s normal business hours, and if not sent during normal business hours, then on the recipient’s next business day; (iii) five (5) days after having been sent by registered or certified
mail, return receipt requested, postage prepaid; or (iv) one (1) business day after the business day of deposit with a nationally recognized overnight courier, freight prepaid, specifying next-day
delivery, with written verification of receipt. All communications shall be sent to the respective parties at their addresses as set forth on the signatures pages, or to the principal office of the Company and to the attention of the Chief Executive
Officer, in the case of the Company, or to such email address, facsimile number, or address as subsequently modified by written notice given in accordance with this Subsection 6.5. If notice is given to the Company, a copy shall also
be sent to Dechert LLP, 1900 K Street NW, Washington, DC 20006, Attn: David E. Schulman and if notice is given to Stockholders, a copy shall also be given to such counsel as may appear with such Investor’s address on the signature pages
attached to the Purchase Agreement. 
 Notwithstanding any of the foregoing, with respect to HBM Healthcare Investments (Cayman) Ltd., only a nationally
recognized courier service (such as FedEx or DHL) shall be used to effectuate the delivery of any notices pursuant to this Subsection 6.5, and such notice or other communication for purpose of this Agreement shall not be treated as effective
or having been given if some other delivery method is utilized; provided, however, that if such notice is being sent internationally, it shall not be deemed defective if such courier does not deliver such notice on the next business day following
deposit (provided that such notice shall be deemed delivered on the date of delivery by such courier service), and provided further, that HBM may agree to receive notice in some other manner set forth in this Subsection 6.5 by written
election; and a copy (which shall not constitute notice) shall also be sent to Sidley Austin LLP, 1999 Avenue of the Stars, 17th Floor, Los Angeles, California 90067, Attention: Mehdi Khodadad. 

  
 27 

 6.6. Amendments and Waivers. Any term of this Agreement may be amended and the
observance of any term of this Agreement may be waived (either generally or in a particular instance, and either retroactively or prospectively) only with the written consent of the Company and the holders of a majority of the Registrable Securities
then outstanding; provided that the Company may in its sole discretion waive compliance with Subsection 2.12(c) (and the Company’s failure to object promptly in writing after notification of a proposed assignment allegedly in
violation of Subsection 2.12(c) shall be deemed to be a waiver); provided further that Section 5.4 may be amended or waived only with the written consent of Soleus and HBM; provided further that the parenthetical in
the opening of Section 3.1, Section 3.3(c) and this proviso may be amended or waived only with the written consent of Farallon; and provided further that any provision hereof may be waived by any waiving party
on such party’s own behalf, without the consent of any other party. Notwithstanding the foregoing, this Agreement may not be amended or terminated and the observance of any term hereof may not be waived with respect to any Investor without the
written consent of such Investor, unless such amendment, termination, or waiver applies to all Investors in the same fashion (it being agreed that (i) any waiver, amendment or termination of any provision or right set forth herein that
specifically references an Investor (e.g. the provisions of Section 5.4) shall not be deemed to apply to all Investors in the same fashion and (ii) a waiver of the provisions of Section 4 with
respect to a particular transaction shall be deemed to apply to all Investors in the same fashion if such waiver does so by its terms, notwithstanding the fact that certain Investors may nonetheless, by agreement with the Company, purchase
securities in such transaction); provided, that in the event of a waiver of the rights of Major Investors under the provisions of Section 4 with respect to a financing transaction, to the extent that any Major
Investors nonetheless purchases New Securities being issued in such financing transaction after such waiver has been obtained (any such Investor, a “Participating Investor”), then Pfizer Ventures (US) LLC (“Pfizer”)
shall be permitted to purchase up to the same percentage (not to exceed 100%) of its pro rata share of New Securities issued in such financing transaction as the percentage of the pro rata share of the New Securities so purchased by the
Participating Investor purchasing the largest portion of such Participating Investor’s pro rata share in such financing transaction. Sections 1.1, 2.11, 2.12, and 5.9 of this Agreement, as well as this sentence of
Section 6.6, may not be amended or terminated, and the observance of any term hereof may not be waived, in an manner that adversely affects Pfizer without the prior written consent of Pfizer.
Section 1.1 (as it pertains to the Janus Investors), Section 1.17, and this sentence of Section 6.6 shall not be amended, modified, terminated or waived without the prior
written consent of the Janus Investors. Further, this Agreement may not be amended, and no provision hereof may be waived, in each case, in any way which would adversely affect the rights of the Key Holders hereunder in a manner disproportionate to
any adverse effect such amendment or waiver would have on the rights of the Investors hereunder, without also the written consent of the holders of at least a majority of the Key Holder Registrable Securities held by the Key Holders. The Company
shall give prompt notice of any amendment or termination hereof or waiver hereunder to any party hereto that did not consent in writing to such amendment, termination, or waiver. Any amendment, termination, or waiver effected in accordance with this
Subsection 6.6 shall be binding on all parties hereto, regardless of whether any such party has consented thereto. No waivers of or exceptions to any term, condition, or provision of this Agreement, in any one or more instances, shall be
deemed to be or construed as a further or continuing waiver of any such term, condition, or provision. 
 6.7. Severability. In case
any one or more of the provisions contained in this Agreement is for any reason held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality, or unenforceability shall not affect any other provision of this Agreement, and
such invalid, illegal, or unenforceable provision shall be reformed and construed so that it will be valid, legal, and enforceable to the maximum extent permitted by law. 

  
 28 

 6.8. Aggregation of Stock. All shares of Registrable Securities held or acquired by
Affiliates shall be aggregated together for the purpose of determining the availability of any rights under this Agreement and such Affiliated persons may apportion such rights as among themselves in any manner they deem appropriate. 

6.9. Additional Investors. Notwithstanding anything to the contrary contained herein, if the Company issues additional shares of Series
D Preferred Stock after the date hereof, any purchaser of such shares of Series D Preferred Stock may become a party to this Agreement by executing and delivering an additional counterpart signature page to this Agreement, and thereafter shall be
deemed an “Investor” for all purposes hereunder. No action or consent by the Investors shall be required for such joinder to this Agreement by such additional Investor, so long as such additional Investor has agreed in writing to be bound
by all of the obligations as an “Investor” hereunder. 
 6.10. Entire Agreement. This Agreement (including any Schedules
and Exhibits hereto) constitutes the full and entire understanding and agreement among the parties with respect to the subject matter hereof, and any other written or oral agreement relating to the subject matter hereof existing between the parties
is expressly canceled. 
 6.11. Dispute Resolution. The parties (a) hereby irrevocably and unconditionally submit to the
jurisdiction of the state courts 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 Delaware 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 above-named 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. 

6.12. WAIVER OF JURY TRIAL. EACH PARTY HEREBY WAIVES ITS RIGHTS TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR
ARISING OUT OF THIS AGREEMENT, THE OTHER TRANSACTION DOCUMENTS, THE SECURITIES OR THE SUBJECT MATTER HEREOF OR THEREOF. THE SCOPE OF THIS WAIVER IS INTENDED TO BE ALL-ENCOMPASSING OF ANY AND ALL DISPUTES THAT
MAY BE FILED IN ANY COURT AND THAT RELATE TO THE SUBJECT MATTER OF THIS TRANSACTION, INCLUDING, WITHOUT LIMITATION, CONTRACT CLAIMS, TORT CLAIMS (INCLUDING NEGLIGENCE), BREACH OF DUTY CLAIMS, AND ALL OTHER COMMON LAW AND STATUTORY CLAIMS. THIS
SECTION HAS BEEN FULLY DISCUSSED BY EACH OF THE PARTIES HERETO AND THESE PROVISIONS WILL NOT BE SUBJECT TO ANY EXCEPTIONS. EACH PARTY HERETO HEREBY FURTHER WARRANTS AND REPRESENTS THAT SUCH PARTY HAS REVIEWED THIS WAIVER WITH ITS LEGAL COUNSEL, AND
THAT SUCH PARTY KNOWINGLY AND VOLUNTARILY WAIVES ITS JURY TRIAL RIGHTS FOLLOWING CONSULTATION WITH LEGAL COUNSEL. 

  
 29 

 6.13. Delays or Omissions. No delay or omission to exercise any right, power, or
remedy accruing to any party under this Agreement, upon any breach or default of any other party under this Agreement, shall impair any such right, power, or remedy of such nonbreaching or nondefaulting party, nor shall it be construed to be a
waiver of or acquiescence to any such breach or default, or to any similar breach or default thereafter occurring, nor shall any waiver of any single breach or default be deemed a waiver of any other breach or default theretofore or thereafter
occurring. All remedies, whether under this Agreement or by law or otherwise afforded to any party, shall be cumulative and not alternative. 

[Remainder of Page Intentionally Left Blank] 

  
 30 

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

			
	BIOATLA, INC.
		
	By:	 	/s/ Jay Short
	Name:	 	Jay Short
	Title:	 	Chief Executive Officer
		
	Address:	 	11805 Torreyana Road
		 	San Diego, CA 92121

  
 [Signature Page to
Investors’ Rights Agreement] 

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

			
	KEY HOLDERS:
	
	Jay Short, PhD
		
	By:	 	/s/ Jay Short
	Name:	 	Jay Short
	Title:	 	Chief Executive Officer
		
	Address:	 	11805 Torreyana Road
		 	San Diego, CA 92121

 [Signature Page to Investors’ Rights Agreement] 

 
			
	KEY HOLDERS:
	
	Carolyn Short
		
	By:	 	/s/ Carolyn Short
	Name:	 	Carolyn Short
		
	Address:	 	11805 Torreyana Road
		 	San Diego, CA 92121

 [Signature Page to Investors’ Rights Agreement] 

 
			
	KEY HOLDERS:
	
	Scott Smith
		
	By:	 	/s/ Scott Smith
	Name:	 	Scott Smith
		
	Address:	 	11805 Torreyana Road
		 	San Diego, CA 92121

  
 [Signature Page to
Investors’ Rights Agreement] 

 
			
	KEY HOLDERS:
	
	HIMALAYA PARENT LLC
		
	By:	 	/s/ Jay Short
	Name:	 	Jay Short
	Title:	 	Chief Executive Officer
		
	Address:	 	11805 Torreyana Road
		 	San Diego, CA 92121

 [Signature Page to Investors’ Rights Agreement] 

 
			
	KEY HOLDERS:
	
	BIOTECH INVESTMENT GROUP, LLC
		
	By:	 	/s/ Masood Tayebi
	Name:	 	Masood Tayebi
	Title:	 	Managing Member
		
	Address:	 	7310 Miramar Road Suite 500
		 	San Diego, CA 92126

 [Signature Page to Investors’ Rights Agreement] 

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

			
	INVESTOR:
	
	SOLEUS PRIVATE EQUITY FUND I, L.P.
	By: Soleus Private Equity GP I, LLC, its General Partner
		
	By:	 	/s/ Steven Musumeci
	Name:	 	Steven Musumeci
	Title:	 	Chief Operating Officer
		
	Address:	 	Soleus Private Equity Fund I, L.P.
		 	 104 Field Point Road, Second Floor

		 	 Greenwich, CT 06830

  
 [Signature Page to
Investors’ Rights Agreement] 

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

			
	INVESTOR:
	
	HBM HEALTHCARE INVESTMENTS (CAYMAN) LTD.
		
	By:	 	/s/ Jean-Marc LeSieur
	Name:	 	Jean-Marc LeSieur
	Title:	 	Director
		
	Address:	 	Governors Square, Suite #4-212-2
		 	23 Lime Tree Bay Avenue
		 	West Bay
		 	Grand Cayman, Cayman Islands

 [Signature Page to Investors’ Rights Agreement] 

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

			
	INVESTOR:
	
	ZONE II HEALTHCARE HOLDINGS, LLC
	
	By: Farallon Capital Management, L.L.C., its Manager
		
	 By:
	 	 /s/ Philip Dreyfuss

	Name:	 	Philip Dreyfuss
	Title:	 	Managing Member
		
	Address:	 	c/o Farallon Capital Management, L.L.C.
		 	One Maritime Plaza, Suite 2100
		 	San Francisco, CA 94111
		 	Attn: Philip Dreyfuss
		 	Email: pdreyfuss@faralloncapital.com
		 	 And

		 	 Email: generalcounsel@faralloncapital.com

 [Signature Page to Investors’ Rights Agreement] 

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

			
	INVESTOR:
	
	CORMORANT GLOBAL HEALTHCARE MASTER FUND, LP
	
	By: Cormorant Global Healthcare GP, LLC
		
	By:	 	/s/ Bihua Chen
	Name:	 	Bihua Chen
	Title:	 	Managing Member of the GP
		
	Address:	 	200 Clarendon Street, 52nd Floor
		 	Boston, MA 02116

 [Signature Page to Investors’ Rights Agreement] 

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

			
	INVESTOR:
	
	CORMORANT PRIVATE HEALTHCARE FUND II, LP
	
	By: Cormorant Private Healthcare GP II, LLC
		
	By:	 	/s/ Bihua Chen
	Name:	 	Bihua Chen
	Title:	 	 Managing Member of the GP
  

	Address:	 	200 Clarendon Street, 52nd Floor
		 	Boston, MA 02116

 [Signature Page to Investors’ Rights Agreement] 

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

			
	INVESTOR:
	
	667, L.P.
	
	By: BAKER BROS. ADVISORS LP, management company and investment advisor to 667, L.P., pursuant to authority granted to it by Baker Biotech Capital, L.P., general partner to 667, L.P., and not as the general
partner.
		
	By:	 	/s/ Scott Lessing
	Name:	 	Scott Lessing
	Title:	 	President
		
	Address:	 	860 Washington St, 3rd Floor
		 	New York, NY 10014

 [Signature Page to Investors’ Rights Agreement] 

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

			
	INVESTOR:
	
	BAKER BROTHERS LIFE SCIENCES, L.P.
	
	By: BAKER BROS. ADVISORS LP, management company and investment advisor to Baker Brothers Life Sciences, L.P., pursuant to authority granted to it by Baker Brothers Life Sciences Capital, L.P., general partner to Baker
Brothers Life Sciences, L.P., and not as the general partner.
		
	By:	 	/s/ Scott Lessing
	Name:	 	Scott Lessing
	Title:	 	President
		
	Address:	 	 860 Washington St, 3rd Floor

		 	 New York, NY 10014

 [Signature Page to Investors’ Rights Agreement] 

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

			
	INVESTOR:
	
	A.M. PAPPAS LIFE SCIENCE VENTURES V, LP
	
	By: AMP&A Management V, LLC, its General Partner
		
	By:	 	/s/ Arthur M. Pappas
	Name:	 	Arthur M. Pappas
	Title:	 	CEO & Managing Partner
		
	Address:	 	c/o Matthew Boyer
		 	Pappas Capital, LLC 2520 Meridian Parkway, Suite 400
		 	 Durham, NC 27713

mboyer@pappas-capital.com

		 	(919) 998-3300

 [Signature Page to Investors’ Rights Agreement] 

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

			
	INVESTOR:
	
	PV V CE FUND, LP
	
	By: AMP&A Management V, LLC, its General Partner
		
	By:	 	/s/ Arthur M. Pappas
	Name:	 	 Arthur M. Pappas

	Title:	 	CEO & Managing Partner
		
	Address:	 	c/o Matthew Boyer
		 	Pappas Capital, LLC 2520 Meridian Parkway, Suite 400
		 	 Durham, NC 27713

mboyer@pappas-capital.com

		 	 (919) 998-3300

 [Signature Page to Investors’ Rights Agreement] 

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

			
	INVESTOR:
	
	JANUS HENDERSON GLOBAL LIFE SCIENCES FUND
	
	By: Janus Capital Management LLC, its investment advisor
		
	By:	 	/s/ Andrew Acker
	Name:	 	Andrew Acker
	Title:	 	Authorized Signatory
		
	Address:	 	 c/o Janus Capital Management
 LLC

151 Detroit Street

		 	 Denver, CO 80206

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

		 	 Perkins Coie LLP
 3150 Porter
Drive

		 	 Palo Alto, CA 94306

		 	 Attn: Adrian Rich

		 	 Email: arich@perkinscoie.com

 [Signature Page to Investors’ Rights Agreement] 

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

			
	INVESTOR:
	
	JANUS HENDERSON BIOTECH INNOVATION MASTER FUND LIMITED FUND
	
	By: Janus Capital Management LLC, its investment advisor
		
	By:	 	/s/ Andrew Acker
	Name:	 	Andrew Acker
	Title:	 	 Authorized Signatory

		
	Address:	 	 c/o Janus Capital Management LLC
 151 Detroit
Street

		 	Denver, CO 80206
	
	 With a copy (which shall not constitute notice) to:

		 	Perkins Coie LLP
		 	 3150 Porter Drive

		 	Palo Alto, CA 94306
		 	 Attn: Adrian Rich

		 	 Email: arich@perkinscoie.com

 [Signature Page to Investors’ Rights Agreement] 

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

			
	INVESTOR:
	
	JANUS HENDERSON CAPITAL FUNDS PLC ON BEHALF OF ITS SERIES JANUS HENDERSON GLOBAL LIFE SCIENCES FUND
	
	By: Janus Capital Management LLC, its investment advisor
		
	By:	 	/s/ Andrew Acker
	Name:	 	Andrew Acker
	Title:	 	Authorized Signatory
		
	Address:	 	 c/o Janus Capital Management LLC
 151 Detroit
Street

		 	 Denver, CO 80206

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

		 	Perkins Coie LLP
		 	 3150 Porter Drive

		 	 Palo Alto, CA 94306

		 	 Attn: Adrian Rich

		 	 Email: arich@perkinscoie.com

 [Signature Page to Investors’ Rights Agreement] 

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

			
	INVESTOR:
	
	BOXER CAPITAL, LLC
		
	By:	 	/s/ Aaron Davis
	Name:	 	 Aaron Davis

	Title:	 	 Chief Executive Officer

		
	Address:	 	11682 El Camino Real, Suite 320
		 	 San Diego, CA 92130

 [Signature Page to Investors’ Rights Agreement] 

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

			
	INVESTOR:
	
	MVA INVESTORS, LLC
		
	By:	 	/s/ Aaron Davis
	Name:	 	 Aaron Davis

	Title:	 	 Chief Executive Officer

		
	Address:	 	 11682 El Camino Real, Suite 320

		 	 San Diego, CA 92130

 [Signature Page to Investors’ Rights Agreement] 

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

			
	INVESTOR:
	
	PFIZER VENTURES (US) LLC
		
	By:	 	/s/ Barbara Dalton, Ph.D.
	Name:	 	 Barbara Dalton, Ph. D.

	Title:	 	 President, Pfizer Ventures (US) LLC 

		
	Address:	 	 Andrew J. Muratore, Esq.

		 	 Pfizer Inc.
 235 East 42nd Street

		 	 New York, NY 10017

 [Signature Page to Investors’ Rights Agreement] 

 SCHEDULE A 

Investors 
 Soleus Private Equity Fund I,
L.P. 
 HBM Healthcare Investments (Cayman) Ltd. 
 Zone II
Healthcare Holdings, LLC 
 Cormorant Global Healthcare Master Fund, LP 

Cormorant Private Healthcare Fund II, LP 
 667, L.P. 

Baker Brothers Life Sciences, L.P. 
 A.M. Pappas Life Science
Ventures V, LP 
 PV V CEO Fund, LP 
 Janus Henderson Global
Life Sciences Fund 
 Janus Henderson Capital Funds Plc—Janus Henderson Global Life Sciences Fund 

Janus Henderson Biotech Innovation Master Fund Limited 
 Boxer
Capital, LLC 
 MVA Investors, LLC 
 Pfizer Venture (US) LLC

 [Signature Page to Investors’ Rights Agreement] 

 SCHEDULE B 

Key Holders 
 Jay Short 

Carolyn Short 
 Scott Smith 

Biotech Investment Group, LLC 
 Himalaya Parent LLCEX-4.3

 Exhibit 4.3 

RIGHT OF FIRST REFUSAL 

AND CO-SALE AGREEMENT 

THIS RIGHT OF FIRST REFUSAL AND CO-SALE AGREEMENT (this “Agreement”) is made as of
the 13th day of July, 2020 by and among BioAtla, Inc., a Delaware corporation (the “Company”), the Investors listed on Schedule A and the Key Holders
listed on Schedule B. 
 RECITALS: 

WHEREAS, each Key Holder is the direct or indirect beneficial owner of the number of shares of Capital Stock, or of options to purchase Common
Stock, set forth opposite the name of such Key Holder on Schedule B. 
 WHEREAS, the Company and the Investors are parties to that
certain Series D Preferred Stock Purchase Agreement, of even date herewith (the “Purchase Agreement”), pursuant to which the Investors have agreed to purchase shares of the Series D Preferred Stock of the Company, par value $0.0001
per share (“Series D Preferred Stock”); and 
 WHEREAS, the Key Holders and the Company desire to further induce the
Investors to purchase Series D Preferred Stock; 
 NOW, THEREFORE, the Company, the Key Holders and the Investors agree as follows: 

1. Definitions. 
 1.1.
“Affiliate” means, with respect to any specified Investor, any other Person who, directly or indirectly, controls, is controlled by, or is under common control with, such Investor, including, without limitation, any general partner,
managing member, officer, director or trustee of such Investor, or any limited liability company, limited partnership, investment fund or registered investment company now or hereafter existing that is controlled by one or more general partners,
managers, managing members or investment advisors of, or shares the same management company or investment advisor with, such Investor; any wholly-owned subsidiary of such Investor; or any direct or indirect wholly-owned subsidiary of the ultimate
parent entity of such Investor; provided, however, that (i) each Janus Investor shall be deemed to be an “Affiliate” of each other Janus Investor, and (ii) an entity that is an “Affiliate” of a
Janus Investor shall not be deemed to be an “Affiliate” of any other Janus Investor unless such entity is a Janus Investor (and, for the avoidance of doubt, an “Affiliate” of such entity shall not be deemed an
“Affiliate” of any Janus Investor solely by virtue of being an “Affiliate” of such entity). 
 1.2. “Capital
Stock” means (a) shares of Common Stock and Preferred Stock (whether now outstanding or hereafter issued in any context), (b) shares of Common Stock issued or issuable upon conversion of Preferred Stock and (c) shares of Common
Stock issued or issuable upon exercise or conversion, as applicable, of stock options, warrants or other convertible securities of the Company, in each case now owned or subsequently acquired by any Key Holder, any Investor, or their respective
successors or permitted transferees or assigns. For purposes of the number of shares of Capital Stock held by an Investor or Key Holder (or any other calculation based thereon), all shares of Preferred Stock shall be deemed to have been converted
into Common Stock at the then-applicable conversion ratio. 

  
 1 

 1.3. “Certificate of Incorporation” means the Company’s Certificate of
Incorporation, as amended from time to time. 
 1.4. “Change of Control” means a transaction or series of related
transactions in which a person, or a group of related persons, acquires from stockholders of the Company shares representing more than fifty percent (50%) of the outstanding voting power of the Company. 

1.5. “Common Stock” means shares of Common Stock of the Company, $0.0001 par value per share. 

1.6. “Company Notice” means written notice from the Company notifying the selling Key Holders that the Company intends to
exercise its Right of First Refusal as to all or a portion of the Transfer Stock with respect to any Proposed Key Holder Transfer. 
 1.7.
“Investor Notice” means written notice from an Investor notifying the Company and the selling Key Holder that such Investor intends to exercise its Secondary Refusal Right as to a portion of the Transfer Stock with respect to any
Proposed Key Holder Transfer. 
 1.8. “Investors” means the persons named on Schedule A hereto,
each person to whom the rights of an Investor are assigned pursuant to Subsection 6.10, each person who hereafter becomes a signatory to this Agreement pursuant to Subsection 6.12 and any one of them, as the context may require. 

1.9. “Janus Investors” shall mean Investors, or permitted transferees of Common Stock (issued or issuable upon conversion of
Preferred Stock) held by Janus Investors, that are advisory or subadvisory clients of Janus Capital Management LLC, including, but not limited to, Janus Henderson Global Life Sciences Fund, Janus Henderson Capital Funds Plc—Janus Henderson
Global Life Sciences Fund, and Janus Henderson Biotech Innovation Master Fund Limited. 
 1.10. “Key Holders” means the
persons named on Schedule B hereto, each person to whom the rights of a Key Holder are assigned pursuant to Subsection 3.1, each person who hereafter becomes a signatory to this Agreement pursuant to Subsection
6.10 or 6.18 and any one of them, as the context may require. 
 1.11. “Preferred Stock” means, collectively,
all shares of Series D Preferred Stock. 
 1.12. “Proposed Key Holder Transfer” means any assignment, sale, offer to sell,
pledge, mortgage, hypothecation, encumbrance, disposition of or any other like transfer or encumbering of any Transfer Stock (or any interest therein) proposed by any of the Key Holders. 

1.13. “Proposed Transfer Notice” means written notice from a Key Holder setting forth the terms and conditions of a Proposed
Key Holder Transfer. 

  
 2 

 1.14. “Prospective Transferee” means any person to whom a Key Holder
proposes to make a Proposed Key Holder Transfer. 
 1.15. “Right of Co-Sale” means
the right, but not an obligation, of an Investor to participate in a Proposed Key Holder Transfer on the terms and conditions specified in the Proposed Transfer Notice. 

1.16. “Right of First Refusal” means the right, but not an obligation, of the Company, or its permitted transferees or
assigns, to purchase some or all of the Transfer Stock with respect to a Proposed Key Holder Transfer, on the terms and conditions specified in the Proposed Transfer Notice. 

1.17. “Secondary Notice” means written notice from the Company notifying the Investors and the selling Key Holder that the
Company does not intend to exercise its Right of First Refusal as to all shares of Transfer Stock with respect to any Proposed Key Holder Transfer. 

1.18. “Secondary Refusal Right” means the right, but not an obligation, of each Investor to purchase up to its pro rata
portion (based upon the total number of shares of Capital Stock then held by all Investors) of any Transfer Stock not purchased pursuant to the Right of First Refusal, on the terms and conditions specified in the Proposed Transfer Notice. 

1.19. “Transfer Stock” means shares of Capital Stock directly or indirectly owned by a Key Holder, or issued to a Key Holder
after the date hereof (including, without limitation, in connection with any stock split, stock dividend, recapitalization, reorganization, or the like), but does not include any shares of Preferred Stock or of Common Stock that are issued or
issuable upon conversion of Preferred Stock. 
 1.20. “Undersubscription Notice” means written notice from an Investor
notifying the Company and the selling Key Holder that such Investor intends to exercise its option to purchase all or any portion of the Transfer Stock not purchased pursuant to the Right of First Refusal or the Secondary Refusal Right. 

2. Agreement Among the Company, the Investors and the Key Holders. 

2.1. Right of First Refusal. 

(a) Grant. Subject to the terms of Section 3 below, each Key Holder hereby unconditionally and irrevocably
grants to the Company a Right of First Refusal to purchase all or any portion of Transfer Stock that such Key Holder may propose to transfer in a Proposed Key Holder Transfer, at the same price and on the same terms and conditions as those offered
to the Prospective Transferee. 
 (b) Notice. Each Key Holder proposing to make a Proposed Key Holder Transfer must deliver a
Proposed Transfer Notice to the Company and each Investor not later than forty-five (45) days prior to the consummation of such Proposed Key Holder Transfer. Such Proposed Transfer Notice shall contain the material terms and conditions
(including price and form of consideration) of the Proposed Key Holder Transfer, the identity of the Prospective Transferee and the intended date of the Proposed Key Holder Transfer. To exercise its Right of First Refusal

  
 3 

 
under this Section 2, the Company must deliver a Company Notice to the selling Key Holder within fifteen (15) days after delivery of the Proposed Transfer Notice
specifying the number of shares of Transfer Stock to be purchased by the Company. In the event of a conflict between this Agreement and any other agreement that may have been entered into by a Key Holder with the Company that contains a preexisting
right of first refusal, the Company and the Key Holder acknowledge and agree that the terms of this Agreement shall control and the preexisting right of first refusal shall be deemed satisfied by compliance with Subsection 2.1(a) and this
Subsection 2.1(b). 
 (c) Grant of Secondary Refusal Right to Investors. Subject to the terms of
Section 3 below, each Key Holder hereby unconditionally and irrevocably grants to the Investors a Secondary Refusal Right to purchase all or any portion of the Transfer Stock not purchased by the Company pursuant to the
Right of First Refusal, as provided in this Subsection 2.1(c). If the Company does not intend to exercise its Right of First Refusal with respect to all Transfer Stock subject to a Proposed Key Holder Transfer, the Company
must deliver a Secondary Notice to the selling Key Holder and to each Investor to that effect no later than fifteen (15) days after the selling Key Holder delivers the Proposed Transfer Notice to the Company. To exercise its Secondary Refusal
Right, an Investor must deliver an Investor Notice to the selling Key Holder and the Company within ten (10) days after the Company’s deadline for its delivery of the Secondary Notice as provided in the preceding sentence. 

(d) Undersubscription of Transfer Stock. If options to purchase have been exercised by the Company and the Investors with respect to
some but not all of the Transfer Stock by the end of the ten (10) day period specified in the last sentence of Subsection 2.1(c) (the “Investor Notice Period”), then the Company shall, immediately after the expiration of
the Investor Notice Period, send written notice (the “Company Undersubscription Notice”) to those Investors who fully exercised their Secondary Refusal Right within the Investor Notice Period (the “Exercising
Investors”). Each Exercising Investor shall, subject to the provisions of this Subsection 2.1(d), have an additional option to purchase all or any part of the balance of any such remaining unsubscribed shares of Transfer Stock on the
terms and conditions set forth in the Proposed Transfer Notice. To exercise such option, an Exercising Investor must deliver an Undersubscription Notice to the selling Key Holder and the Company within ten (10) days after the expiration of the
Investor Notice Period. In the event there are two (2) or more such Exercising Investors that choose to exercise the last-mentioned option for a total number of remaining shares in excess of the number available, the remaining shares available
for purchase under this Subsection 2.1(d) shall be allocated to such Exercising Investors pro rata based on the number of shares of Transfer Stock such Exercising Investors have elected to purchase pursuant to the Secondary Refusal Right
(without giving effect to any shares of Transfer Stock that any such Exercising Investor has elected to purchase pursuant to the Company Undersubscription Notice). If the options to purchase the remaining shares are exercised in full by the
Exercising Investors, the Company shall immediately notify all of the Exercising Investors and the selling Key Holder of that fact. 
 (e)
Consideration; Closing. If the consideration proposed to be paid for the Transfer Stock is in property, services or other non-cash consideration, the fair market value of the consideration shall be as
determined in good faith by the Company’s Board of Directors (the “Board”) and as set forth in the Company Notice. If the Company or any Investor cannot for any 

  
 4 

 
reason pay for the Transfer Stock in the same form of non-cash consideration, the Company or such Investor may pay the cash value equivalent thereof, as
determined in good faith by the Board and as set forth in the Company Notice. The closing of the purchase of Transfer Stock by the Company and the Investors shall take place, and all payments from the Company and the Investors shall have been
delivered to the selling Key Holder, by the later of (i) the date specified in the Proposed Transfer Notice as the intended date of the Proposed Key Holder Transfer and (ii) forty-five (45) days after delivery of the Proposed Transfer
Notice. 
 2.2. Right of Co-Sale. 

(a) Exercise of Right. If any Transfer Stock subject to a Proposed Key Holder Transfer is not purchased pursuant to Subsection
2.1 above and thereafter is to be sold to a Prospective Transferee, each respective Investor may elect to exercise its Right of Co-Sale and participate on a pro rata basis in the Proposed Key Holder
Transfer as set forth in Subsection 2.2(b) below and, subject to Subsection 2.2(d), otherwise on the same terms and conditions specified in the Proposed Transfer Notice. Each Investor who desires to exercise its Right of Co-Sale (each, a “Participating Investor”) must give the selling Key Holder written notice to that effect within fifteen (15) days after the deadline for delivery of the Secondary Notice
described above, and upon giving such notice such Participating Investor shall be deemed to have effectively exercised the Right of Co-Sale. 

(b) Shares Includable. Each Participating Investor may include in the Proposed Key Holder Transfer all or any part of such
Participating Investor’s Capital Stock equal to the product obtained by multiplying (i) the aggregate number of shares of Transfer Stock subject to the Proposed Key Holder Transfer (excluding shares purchased by the Company or the
Participating Investors pursuant to the Right of First Refusal or the Secondary Refusal Right) by (ii) a fraction, the numerator of which is the number of shares of Capital Stock owned by such Participating Investor immediately before
consummation of the Proposed Key Holder Transfer (including any shares that such Participating Investor has agreed to purchase pursuant to the Secondary Refusal Right) and the denominator of which is the total number of shares of Capital Stock
owned, in the aggregate, by all Participating Investors immediately prior to the consummation of the Proposed Key Holder Transfer (including any shares that all Participating Investors have collectively agreed to purchase pursuant to the Secondary
Refusal Right), plus the number of shares of Transfer Stock held by the selling Key Holder. To the extent one (1) or more of the Participating Investors exercise such right of participation in accordance with the terms and conditions set forth
herein, the number of shares of Transfer Stock that the selling Key Holder may sell in the Proposed Key Holder Transfer shall be correspondingly reduced. 

(c) Purchase and Sale Agreement. The Participating Investors and the selling Key Holder agree that the terms and conditions of any
Proposed Key Holder Transfer in accordance with this Subsection 2.2 will be memorialized in, and governed by, a written purchase and sale agreement with the Prospective Transferee (the “Purchase and Sale Agreement”) with
customary terms and provisions for such a transaction, and the Participating Investors and the selling Key Holder further covenant and agree to enter into such Purchase and Sale Agreement as a condition precedent to any sale or other transfer in
accordance with this Subsection 2.2. 

  
 5 

 (d) Allocation of Consideration. 

(i) Subject to Subsection 2.2(d)(ii), the aggregate consideration payable to the Participating Investors and the selling Key Holder
shall be allocated based on the number of shares of Capital Stock sold to the Prospective Transferee by each Participating Investor and the selling Key Holder as provided in Subsection 2.2(b), provided, that if a Participating Investor
wishes to sell Preferred Stock, the price set forth in the Proposed Transfer Notice shall be appropriately adjusted based on the conversion ratio of the Preferred Stock into Common Stock. 

(ii) In the event that the Proposed Key Holder Transfer constitutes a Change of Control, the terms of the Purchase and Sale Agreement shall
provide that the aggregate consideration from such transfer shall be allocated to the Participating Investors and the selling Key Holder in accordance with Sections 2.1 and 2.2 of Article IV(B) of the Certificate of Incorporation and, if applicable,
the next sentence of this Subsection 2.2(d)(ii) as if (A) such transfer were a Deemed Liquidation Event (as defined in the Certificate of Incorporation), and (B) the Capital Stock sold in accordance with the Purchase and Sale
Agreement were the only Capital Stock outstanding. In the event that a portion of the aggregate consideration payable to the Participating Investor(s) and selling Key Holder is placed into escrow and/or is payable only upon satisfaction of
contingencies, the Purchase and Sale Agreement shall provide that (x) the portion of such consideration that is not placed in escrow and is not subject to contingencies (the “Initial Consideration”) shall be allocated in
accordance with Sections 2.1 and 2.2 of Article IV(B) of the Certificate of Incorporation as if the Initial Consideration were the only consideration payable in connection with such transfer, and (y) any additional consideration which becomes
payable to the Participating Investor(s) and selling Key Holder upon release from escrow or satisfaction of such contingencies shall be allocated in accordance with Sections 2.1 and 2.2 of Article IV(B) of the Certificate of Incorporation after
taking into account the previous payment of the Initial Consideration as part of the same transfer. 
 (e) Purchase by Selling Key
Holder; Deliveries. Notwithstanding Subsection 2.2(c) above, if any Prospective Transferee or Transferees refuse(s) to purchase securities subject to the Right of Co-Sale from any Participating
Investor or Investors or upon the failure to negotiate in good faith a Purchase and Sale Agreement reasonably satisfactory to the Participating Investors, no Key Holder may sell any Transfer Stock to such Prospective Transferee or Transferees unless
and until, simultaneously with such sale, such Key Holder purchases all securities subject to the Right of Co-Sale from such Participating Investor or Investors on the same terms and conditions (including the
proposed purchase price) as set forth in the Proposed Transfer Notice and as provided in Subsection 2.2(d)(i); provided, however, if such sale constitutes a Change of Control, the portion of the aggregate consideration paid by the selling Key
Holder to such Participating Investor or Investors shall be made in accordance with the first sentence of Subsection 2.2(d)(ii). In connection with such purchase by the selling Key Holder, such Participating Investor or Investors shall
deliver to the selling Key Holder any stock certificate or certificates, properly endorsed for transfer, representing the Capital Stock being purchased by the selling Key Holder (or request that the Company effect such transfer in the name of the
selling Key Holder). Any such shares transferred to the selling Key Holder will be transferred to the Prospective Transferee against payment therefor in consummation of the sale of the Transfer Stock pursuant to the terms and conditions specified in
the Proposed Transfer Notice, and the selling Key Holder shall concurrently therewith remit or direct payment to each such Participating Investor the portion of the aggregate consideration to which each such Participating Investor is entitled by
reason of its participation in such sale as provided in this Subsection 2.2(e). 

  
 6 

 (f) Additional Compliance. If any Proposed Key Holder Transfer is not consummated
within forty-five (45) days after receipt of the Proposed Transfer Notice by the Company, the Key Holders proposing the Proposed Key Holder Transfer may not sell any Transfer Stock unless they first comply in full with each provision of this
Section 2. The exercise or election not to exercise any right by any Investor hereunder shall not adversely affect its right to participate in any other sales of Transfer Stock subject to this
Subsection 2.2. 
 2.3. Effect of Failure to Comply. 

(a) Transfer Void; Equitable Relief. Any Proposed Key Holder Transfer not made in compliance with the requirements of this Agreement
shall be null and void ab initio, shall not be recorded on the books of the Company or its transfer agent and shall not be recognized by the Company. Each party hereto acknowledges and agrees that any breach of this Agreement would result in
substantial harm to the other parties hereto for which monetary damages alone could not adequately compensate. Therefore, the parties hereto unconditionally and irrevocably agree that any non-breaching party
hereto shall be entitled to seek protective orders, injunctive relief and other remedies available at law or in equity (including, without limitation, seeking specific performance or the rescission of purchases, sales and other transfers of Transfer
Stock not made in strict compliance with this Agreement). 
 (b) Violation of First Refusal Right. If any Key Holder becomes
obligated to sell any Transfer Stock to the Company or any Investor under this Agreement and fails to deliver such Transfer Stock in accordance with the terms of this Agreement, the Company and/or such Investor may, at its option, in addition to all
other remedies it may have, send to such Key Holder the purchase price for such Transfer Stock as is herein specified and transfer to the name of the Company or such Investor (or request that the Company effect such transfer in the name of an
Investor) on the Company’s books any certificate or certificates, instruments, or book entry representing the Transfer Stock to be sold. 

(c) Violation of Co-Sale Right. If any Key Holder purports to sell any Transfer Stock in
contravention of the Right of Co-Sale (a “Prohibited Transfer”), each Participating Investor who desires to exercise its Right of Co-Sale under
Subsection 2.2 may, in addition to such remedies as may be available by law, in equity or hereunder, require such Key Holder to purchase from such Participating Investor the type and number of shares of Capital Stock that such Participating
Investor would have been entitled to sell to the Prospective Transferee had the Prohibited Transfer been effected in compliance with the terms of Subsection 2.2. The sale will be made on the same terms, including, without limitation, as
provided in Subsection 2.2(d)(i) and the first sentence of Subsection 2.2(d)(ii), as applicable, and subject to the same conditions as would have applied had the Key Holder not made the Prohibited Transfer, except that the sale
(including, without limitation, the delivery of the purchase price) must be made within ninety (90) days after the Participating Investor learns of the Prohibited Transfer, as opposed to the timeframe proscribed in
Subsection 2.2. Such Key Holder shall also reimburse each Participating Investor for any and all reasonable and documented out-of-pocket fees
and expenses, including reasonable legal fees and expenses, incurred pursuant to the exercise or the attempted exercise of the Participating Investor’s rights under Subsection 2.2. 

  
 7 

 3. Exempt Transfers. 

3.1. Exempted Transfers. Notwithstanding the foregoing or anything to the contrary herein, the provisions of Subsections 2.1 and
2.2 shall not apply: (a) in the case of a Key Holder that is an entity, upon a transfer for no consideration by such Key Holder to its stockholders, members, partners or other equity holders, (b) to a repurchase of Transfer Stock
from a Key Holder by the Company at a price no greater than that originally paid by such Key Holder for such Transfer Stock and pursuant to an agreement containing vesting and/or repurchase provisions approved by a majority of the Board, or
(c) in the case of a Key Holder that is a natural person, upon a transfer of Transfer Stock by such Key Holder made for bona fide estate planning purposes, either during his or her lifetime or on death by will or intestacy to his or her spouse,
child (natural or adopted), or any other direct lineal descendant of such Key Holder (or his or her spouse) (all of the foregoing collectively referred to as “family members”), or any other relative approved by unanimous consent of
the Board, or any 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 Key Holder or any such family members; provided, that in the case
of clause(s) (a) and (c), the Key Holder shall deliver prior written notice to the Investors of such gift or transfer and such shares of Transfer Stock 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 issuance, 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 Key Holder (but only with
respect to the securities so transferred to the transferee), including the obligations of a Key Holder with respect to Proposed Key Holder Transfers of such Transfer Stock pursuant to Section 2; and provided,
further, in the case of any transfer pursuant to clause (a) or (c) above, that such transfer is made pursuant to a transaction in which there is no consideration actually paid for such transfer. 

3.2. Exempted Offerings. Notwithstanding the foregoing or anything to the contrary herein, the provisions of
Section 2 shall not apply to the sale of any Transfer Stock (a) to the public in an offering pursuant to an effective registration statement under the Securities Act of 1933, as amended (a “Public
Offering”) or (b) pursuant to a Deemed Liquidation Event (as defined in the Certificate of Incorporation). 
 3.3.
Prohibited Transferees. Notwithstanding the foregoing, no Key Holder shall transfer any Transfer Stock to (a) any entity which, in the determination of the Board, directly or indirectly competes with the Company or (b) any customer,
distributor or supplier of the Company, if the Board should determine that such transfer would result in such customer, distributor or supplier receiving information that would place the Company at a competitive disadvantage with respect to such
customer, distributor or supplier. 
 4. Legend. Each certificate, instrument, or book entry representing shares of Transfer Stock
held by the Key Holders or issued to any permitted transferee in connection with a transfer permitted by Subsection 3.1 hereof shall be endorsed with the following legend: 

THE SALE, PLEDGE, HYPOTHECATION OR TRANSFER OF THE SECURITIES REPRESENTED HEREBY IS SUBJECT TO, AND IN CERTAIN CASES PROHIBITED BY, THE TERMS
AND CONDITIONS OF A CERTAIN 

  
 8 

 
RIGHT OF FIRST REFUSAL AND CO-SALE AGREEMENT BY AND AMONG THE STOCKHOLDER, THE CORPORATION AND CERTAIN OTHER HOLDERS OF STOCK OF THE CORPORATION. COPIES OF
SUCH AGREEMENT MAY BE OBTAINED UPON WRITTEN REQUEST TO THE SECRETARY OF THE CORPORATION. 
 Each Key Holder agrees that the Company may instruct its
transfer agent to impose transfer restrictions on the shares notated with the legend referred to in this Section 4 above to enforce the provisions of this Agreement, and the Company agrees to promptly do so. The legend
shall be removed upon termination of this Agreement at the request of the holder. 
 5.
Lock-Up. 
 5.1. Agreement to Lock-Up. Each Key
Holder 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 Company’s initial public offering (the
“IPO”) and ending on the date specified by the Company and the managing underwriter, such period not to exceed one hundred eighty (180) days, or such other period, not to exceed an additional thirty-five (35) days, as may
be requested by the Company or an underwriter to accommodate regulatory restrictions on (1) the publication or other distribution of research reports and (2) analyst recommendations and opinions, including, but not limited to, the
restrictions contained in FINRA Rule 2711(f)(4) or NYSE Rule 472(f)(4), or any successor provisions or amendments thereto, (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 Capital Stock held immediately prior to the effectiveness of the registration statement for the IPO; 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 Capital Stock, whether any such transaction described in clause (a) or (b) above is to
be settled by delivery of Capital Stock or other securities, in cash or otherwise. The foregoing provisions of this Section 5 shall not apply to the sale of any shares to an underwriter pursuant to an underwriting
agreement, and shall only be applicable to the Key Holders if all officers, directors and holders of more than one percent (1%) of the outstanding Common Stock (after giving effect to the conversion into Common Stock of all outstanding Series D
Preferred Stock) enter into similar agreements. The underwriters in connection with the IPO are intended third-party beneficiaries of this Section 5 and shall have the right, power and authority to enforce the provisions
hereof as though they were a party hereto. Each Key Holder further agrees to execute such agreements as may be reasonably requested by the underwriters in the IPO that are consistent with this Section 5 or that are
necessary to give further effect thereto. 
 5.2. Stop Transfer Instructions. In order to enforce the foregoing covenant, the Company
may impose stop-transfer instructions with respect to the shares of Capital Stock of each Key Holder (and transferees and assignees thereof) until the end of such restricted period. 

6. Miscellaneous. 
 6.1.
Term. This Agreement shall automatically terminate upon the earlier of (a) immediately prior to the consummation of the Company’s IPO and (b) the consummation of a Deemed Liquidation Event (as defined in the Certificate of
Incorporation). 

  
 9 

 6.2. Stock Split. All references to numbers of shares in this Agreement shall be
appropriately adjusted to reflect any stock dividend, split, combination or other recapitalization affecting the Capital Stock occurring after the date of this Agreement. 

6.3. Ownership. Each Key Holder represents and warrants that such Key Holder is the direct or indirect beneficial owner of the shares
of Transfer Stock subject to this Agreement and that no other person or entity has any interest in such shares (other than a community property interest as to which the holder thereof has acknowledged and agreed in writing to the restrictions and
obligations hereunder or, in the case of Himalaya Parent LLC, a Delaware limited liability company, as contemplated by its applicable operating agreement). 

6.4. Dispute Resolution. The parties (a) hereby irrevocably and unconditionally submit to the jurisdiction of the state courts 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 Delaware 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 above-named 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. 

6.5. WAIVER OF JURY TRIAL: EACH PARTY HEREBY WAIVES ITS RIGHTS TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF THIS AGREEMENT, THE OTHER TRANSACTION DOCUMENTS, THE SECURITIES OR THE SUBJECT MATTER HEREOF OR THEREOF. THE SCOPE OF THIS WAIVER IS INTENDED TO BE ALL-ENCOMPASSING OF ANY AND ALL DISPUTES THAT MAY BE
FILED IN ANY COURT AND THAT RELATE TO THE SUBJECT MATTER OF THIS TRANSACTION, INCLUDING, WITHOUT LIMITATION, CONTRACT CLAIMS, TORT CLAIMS (INCLUDING NEGLIGENCE), BREACH OF DUTY CLAIMS, AND ALL OTHER COMMON LAW AND STATUTORY CLAIMS. THIS SECTION HAS
BEEN FULLY DISCUSSED BY EACH OF THE PARTIES HERETO AND THESE PROVISIONS WILL NOT BE SUBJECT TO ANY EXCEPTIONS. EACH PARTY HERETO HEREBY FURTHER WARRANTS AND REPRESENTS THAT SUCH PARTY HAS REVIEWED THIS WAIVER WITH ITS LEGAL COUNSEL, AND THAT SUCH
PARTY KNOWINGLY AND VOLUNTARILY WAIVES ITS JURY TRIAL RIGHTS FOLLOWING CONSULTATION WITH LEGAL COUNSEL. 
 6.6. Notices. All notices
and other communications given or made pursuant to this Agreement shall be in writing and shall be deemed effectively given upon the earlier of actual receipt or: (a) personal delivery to the party to be notified, (b) when sent, if sent by
electronic mail or facsimile during normal business hours of the recipient, and if not sent during normal business hours, then on the recipient’s 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) business day after deposit with a nationally recognized overnight courier, freight prepaid, specifying next business day delivery, with written verification of receipt. All
communications shall be sent to the respective parties at their address as set forth on the signature pages, as the case may be, or to such email address, facsimile number or address as subsequently modified by written notice given in

  
 10 

 
accordance with this Section 6.6. If notice is given to the Company, it shall be sent to 11085 Torreyana Road, San Diego, CA 92121, Attention: Chief Executive Officer;
and a copy (which shall not constitute notice) shall also be sent to Dechert LLP, 1900 K Street NW, Washington, DC 20006, Attn: David E. Schulman; and if notice is given to the Investors, a copy, which shall not constitute notice, shall also be
given to such counsel as may appear with such Investor’s address on the signature pages attached to the Purchase Agreement. 
 Notwithstanding any of
the foregoing, with respect to HBM Healthcare Investments (Cayman) Ltd., only a nationally recognized courier service (such as FedEx or DHL) shall be used to effectuate the delivery of any notices pursuant to this Subsection 6.6, and such
notice or other communication for purpose of this Agreement shall not be treated as effective or having been given if some other delivery method is utilized; provided, however, that if such notice is being sent internationally, it
shall not be deemed defective if such courier does not deliver such notice on the next business day following deposit (provided that such notice shall be deemed delivered on the date of delivery by such courier service), and provided further, that
HBM may agree to receive notice in some other manner set forth in this Subsection 6.6 by written election; and a copy (which shall not constitute notice) shall also be sent to Sidley Austin LLP, 1999 Avenue of the Stars, 17th Floor, Los
Angeles, California 90067, Attention: Mehdi Khodadad. 
 6.7. Entire Agreement. This Agreement (including the Exhibits and Schedules
hereto) constitutes the full and entire understanding and agreement between the parties with respect to the subject matter hereof, and any other written or oral agreement relating to the subject matter hereof existing between the parties are
expressly canceled. 
 6.8. Delays or Omissions. No delay or omission to exercise any right, power or remedy accruing to any party
under this Agreement, upon any breach or default of any other party under this Agreement, shall impair any such right, power or remedy of such non-breaching or
non-defaulting party nor shall it be construed to be a waiver of any such breach or default, or an acquiescence therein, or of or in any similar breach or default thereafter occurring; nor shall any waiver of
any single breach or default be deemed a waiver of any other breach or default theretofore or thereafter occurring. Any waiver, permit, consent or approval of any kind or character on the part of any party of any breach or default under this
Agreement, or any waiver on the part of any party of any provisions or conditions of this Agreement, must be in writing and shall be effective only to the extent specifically set forth in such writing. All remedies, either under this Agreement or by
law or otherwise afforded to any party, shall be cumulative and not alternative. 
 6.9. Amendment; Modification; Waiver and
Termination. This Agreement may be amended, modified or terminated (other than pursuant to Section 6.1 above) and the observance of any term hereof may be waived (either generally or in a particular instance and either retroactively or
prospectively) only by a written instrument executed by (a) the Company, (b) the Key Holders holding a majority of Transfer Stock then held by all of the Key Holders who are then providing services to the Company as officers,
employees, or consultants, and (c) the Investors holding a majority of the Series D Preferred Stock, voting together as a single class on an as-converted basis. Any amendment, modification, termination or
waiver so effected shall be binding upon the Company, the Investors, the Key Holders and all of their respective successors and permitted assigns whether or not such party, assignee or other shareholder entered into or approved such amendment,
modification, termination or waiver. Notwithstanding the foregoing, 

  
 11 

 
(i) this Agreement may not be amended, modified or terminated and the observance of any term hereunder may not be waived with respect to any Investor or Key Holder without the written consent of
such Investor or Key Holder unless such amendment, modification, termination or waiver applies to all Investors and Key Holders, respectively, in the same fashion, (ii) this Agreement may not be amended, modified or terminated and the
observance of any term hereunder may not be waived with respect to any Investor without the written consent of such Investor, if such amendment, modification, termination or waiver would adversely affect the rights of such Investor in a manner
disproportionate to any adverse effect such amendment, modification, termination or waiver would have on the rights of the other Investors under this Agreement, (iii) the consent of the Key Holders shall not be required for any amendment,
modification, termination or waiver if such amendment, modification, termination or waiver does not apply to the Key Holders, (iv) Schedule A hereto may be amended by the Company from time to time in accordance with the Purchase
Agreement to add information regarding Additional Purchasers (as defined in the Purchase Agreement) without the consent of the other parties hereto, and (v) the definition of “Affiliate” (as it pertains to the Janus Investors), the
definition of “Janus Investors” and this Section 6.9 (as it pertains to the Janus Investors) shall not be amended, modified, terminated or waived without the prior written consent of the Janus Investors. The
Company shall give prompt written notice of any amendment, modification or termination hereof or waiver hereunder to any party hereto that did not consent in writing to such amendment, modification, termination or waiver. No waivers of or exceptions
to any term, condition or provision of this Agreement, in any one or more instances, shall be deemed to be, or construed as, a further or continuing waiver of any such term, condition or provision. 

6.10. Assignment of Rights. 

(a) The terms and conditions of this Agreement, and the rights and obligations of the parties hereunder, shall inure to the benefit of and be
binding upon the respective successors, permitted assigns, heirs, executors and legal representatives of the parties and shall inure to the benefit of and be enforceable by each person who shall be an Investor from time to time, including any
permitted transferee. Nothing in this Agreement, express or implied, is intended to confer upon any party other than the parties hereto or their respective successors and permitted assigns any rights, remedies, obligations, or liabilities under or
by reason of this Agreement, except as expressly provided in this Agreement. The rights of any Investor under this Agreement may be assigned, in whole or in part, to any Affiliate of such Investor in connection with a transfer of such
Investor’s Capital Stock by such Investor to such Affiliate. 
 (b) Any successor or permitted assignee of any Key Holder, including
any Prospective Transferee who purchases shares of Transfer Stock in accordance with the terms hereof, shall deliver to the Company and the Investors, as a condition to any transfer or assignment, a counterpart signature page hereto pursuant to
which such successor or permitted assignee shall confirm their agreement to be subject to and bound by all of the provisions set forth in this Agreement that were applicable to the predecessor or assignor of such successor or permitted assignee.

 (c) The rights of the Investors hereunder are not assignable without the Company’s written consent (which shall not be unreasonably
withheld, delayed or conditioned), except (i) by an Investor to any Affiliate or (ii) to an assignee or transferee who acquires at least ten percent (10%) of the shares of Capital Stock (as adjusted for any stock combination, stock split,
stock dividend, recapitalization or other similar transaction) originally purchased by such Investor, 

  
 12 

 
it being acknowledged and agreed that any such assignment, including an assignment contemplated by the preceding clauses (i) or (ii) shall be subject to and conditioned upon any such
assignee’s delivery to the Company and the other Investors of a counterpart signature page hereto pursuant to which such assignee shall confirm their agreement to be subject to and bound by all of the provisions set forth in this Agreement that
were applicable to the assignor of such assignee. 
 (d) Except in connection with an assignment by the Company by operation of law to the
acquirer of the Company, the rights and obligations of the Company hereunder may not be assigned under any circumstances. 
 6.11.
Severability. The invalidity or unenforceability of any provision hereof shall in no way affect the validity or enforceability of any other provision. 

6.12. Additional Investors. Notwithstanding anything to the contrary contained herein, if the Company issues additional shares of the
Company’s Series D Preferred Stock after the date hereof, any purchaser of such shares of Series D Preferred Stock may become a party to this Agreement by executing and delivering an additional counterpart signature page to this Agreement and
thereafter shall be deemed an “Investor” for all purposes hereunder. 
 6.13. Governing Law. This Agreement and any
controversy arising out of or relating to this Agreement shall be governed by and construed in accordance with the General Corporation Law of the State of Delaware as to matters within the scope thereof, and as to all other matters shall be governed
by and construed in accordance with the internal laws of the State of Delaware, without regard to its principles of conflicts of laws. 

6.14. 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. 
 6.15. Counterparts. This Agreement may be executed in two (2) or more
counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument. Counterparts may be delivered via facsimile, 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 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. 

6.16. Aggregation of Stock. All shares of Capital Stock held or acquired by Affiliated entities or persons shall be aggregated together
for the purpose of determining the availability of any rights under this Agreement and such Affiliated persons may apportion such rights as among themselves in any manner they deem appropriate. 

6.17. Specific Performance. In addition to any and all other remedies that may be available at law in the event of any breach of this
Agreement, each Investor shall be entitled to specific performance of the agreements and obligations of the Company and the Key Holders hereunder and to such other injunction or other equitable relief as may be granted by a court of competent
jurisdiction. 
 6.18. Additional Key Holders. In the event that after the date of this Agreement, the Company issues shares of
Common Stock, or options to purchase Common Stock, to any employee or consultant, which shares or options would collectively constitute with respect to such employee or consultant (taking into account all shares of Common Stock, options and other
purchase rights held by such employee or consultant) one percent (1%) or more of the Company’s then outstanding Common Stock (treating for this purpose all shares of Common Stock issuable 

  
 13 

 
upon exercise of or conversion of outstanding options, warrants or convertible securities, as if exercised or converted), the Company shall, as a condition to such issuance, cause such employee
or consultant to execute a counterpart signature page hereto as a Key Holder, and such person shall thereby be bound by, and subject to, all the terms and provisions of this Agreement applicable to a Key Holder. 

6.19. Consent of Spouse. If any Key Holder is married on the date of this Agreement, such Key Holder’s spouse shall execute and
deliver to the Company a consent of spouse in the form of Exhibit A 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 Key Holder’s shares of Transfer Stock that do not otherwise exist by operation of law or the agreement of the parties. If any Key Holder should marry or remarry subsequent to the date of this Agreement,
such Key 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. 

[Remainder of Page Intentionally Left Blank]  

  
 14 

 IN WITNESS WHEREOF, the parties have executed this Right of First Refusal and Co-Sale Agreement as of the date first written above. 
  

			
	BIOATLA, INC.
		
	By:	 	/s/ Jay Short
	Name:	 	Jay Short
	Title:	 	Chief Executive Officer
		
	Address:	 	11805 Torreyana Road
San Diego, CA 92121

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 
			
	 KEY HOLDERS:
  

Jay Short, PhD

		
	By:	 	/s/ Jay Short
	Name:	 	Jay Short
	Title:	 	Chief Executive Officer
		
	Address:	 	11805 Torreyana Road
San Diego, CA 92121

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 
			
	 KEY HOLDERS:
  

Carolyn Short

		
	By:	 	/s/ Carolyn Short
	Name:	 	Carolyn Short
		
	Address:	 	11805 Torreyana Road
San Diego, CA 92121

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 
			
	KEY HOLDERS:
	
	Scott Smith
		
	By:	 	/s/ Scott Smith
	Name:	 	Scott Smith
		
	Address:	 	11805 Torreyana Road
San Diego, CA 92121

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 
			
	KEY HOLDERS:
	
	HIMALAYA PARENT LLC
		
	By:	 	/s/ Jay Short
	Name:	 	Jay Short
	Title:	 	Chief Executive Officer
		
	Address:	 	11805 Torreyana Road
San Diego, CA 92121

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 
			
	KEY HOLDERS:
	
	 BIOTECH INVESTMENT GROUP, LLC

		
	By:	 	/s/ Masood Tayebi
	Name:	 	Masood Tayebi
	Title:	 	Managing Member
		
	Address:	 	7310 Miramar Road Suite 500
San Diego, CA 92126

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 IN WITNESS WHEREOF, the parties have executed this Right of First Refusal and Co-Sale Agreement as of the date first written above. 
  

			
	INVESTOR:
	
	SOLEUS PRIVATE EQUITY FUND I, L.P.
	By: Soleus Private Equity GP I, LLC, its General Partner
		
	 By:
	 	/s/ Steven Musumeci
	Name:	 	Steven Musumeci
	Title:	 	Chief Operating Officer
		
	Address:	 	Soleus Private Equity Fund I, L.P. 104 Field Point Road, Second Floor Greenwich, CT 06830

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 IN WITNESS WHEREOF, the parties have executed this Right of First Refusal and Co-Sale Agreement as of the date first written above. 
  

			
	INVESTOR:
	
	HBM HEALTHCARE INVESTMENTS (CAYMAN) LTD.
		
	By:	 	/s/ Jean-Marc LeSieur
	Name:	 	Jean-Marc LeSieur
	Title:	 	Director
		
	Address:	 	Governors Square, Suite #4-212-2 23 Lime Tree Bay Avenue
West Bay
Grand Cayman, Cayman Islands

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 IN WITNESS WHEREOF, the parties have executed this Right of First Refusal and Co-Sale Agreement as of the date first written above. 
  

			
	INVESTOR:
	
	ZONE II HEALTHCARE HOLDINGS, LLC
	
	By: Farallon Capital Management, L.L.C., its Manager
		
	By:	 	/s/ Philip Dreyfuss
	Name:	 	Philip Dreyfuss
	Title:	 	Managing Member
		
	Address:	 	c/o Farallon Capital Management, L.L.C.
One Maritime Plaza, Suite 2100
San Francisco, CA 94111
Attn: Philip
Dreyfuss
Email:
pdreyfuss@faralloncapital.com
And
Email:
generalcounsel@faralloncapital.com

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 IN WITNESS WHEREOF, the parties have executed this Right of First Refusal and Co-Sale Agreement as of the date first written above. 
  

			
	INVESTOR:
	
	CORMORANT GLOBAL HEALTHCARE MASTER FUND, LP
	
	By: Cormorant Global Healthcare GP, LLC
		
	By:	 	/s/ Bihua Chen
	Name:	 	Bihua Chen
	Title:	 	Managing Member of the GP
		
	Address:	 	 200 Clarendon Street, 52nd Floor
Boston, MA 02116

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 IN WITNESS WHEREOF, the parties have executed this Right of First Refusal and Co-Sale Agreement as of the date first written above. 
  

			
	INVESTOR:
	
	CORMORANT PRIVATE HEALTHCARE FUND II, LP
	
	By: Cormorant Private Healthcare GP II, LLC
		
	By:	 	/s/ Bihua Chen
	Name:	 	Bihua Chen
	Title:	 	Managing Member of the GP
		
	Address:	 	200 Clarendon Street, 52nd Floor
Boston, MA 02116

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 IN WITNESS WHEREOF, the parties have executed this Right of First Refusal and Co-Sale Agreement as of the date first written above. 
  

			
	INVESTOR:
	
	667, L.P.
	
	By: BAKER BROS. ADVISORS LP, management company and investment advisor to 667, L.P., pursuant to authority granted to it by Baker Biotech Capital, L.P., general partner to 667, L.P., and not as the general
partner.
		
	By:	 	/s/ Scott Lessing
	Name:	 	Scott Lessing
	Title:	 	President
		
	Address:	 	860 Washington St, 3rd Floor
New York, NY 10014

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 IN WITNESS WHEREOF, the parties have executed this Right of First Refusal and Co-Sale Agreement as of the date first written above. 
  

			
	INVESTOR:
	
	BAKER BROTHERS LIFE SCIENCES,
L.P.
		
	By:	 	BAKER BROS. ADVISORS LP,
management company and investment advisor to Baker Brothers Life Sciences, L.P., pursuant to authority granted to it by Baker Brothers Life Sciences Capital, L.P., general partner to Baker Brothers Life
Sciences, L.P., and not as the general
partner.

  

			
	By:	 	/s/ Scott Lessing
	Name:	 	Scott Lessing
	Title:	 	President
		
	Address:	 	 860 Washington St, 3rd Floor

New York, NY 10014

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 IN WITNESS WHEREOF, the parties have executed this Right of First Refusal and Co-Sale Agreement as of the date first written above. 
  

			
	INVESTOR:
	
	A.M. PAPPAS LIFE SCIENCE VENTURES V, LP
		
	By:	 	AMP&A Management V, LLC, its General Partner

  

			
	By:	 	/s/ Arthur M. Pappas

 
			
	Name:	 	Arthur M. Pappas
	Title:	 	CEO & Managing Partner
		
	Address:	 	c/o Matthew Boyer
		 	 Pappas Capital, LLC
 2520 Meridian Parkway,
Suite 400
 Durham, NC 27713

mboyer@pappas-capital.com
 (919) 998-3300

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 IN WITNESS WHEREOF, the parties have executed this Right of First Refusal and Co-Sale Agreement as of the date first written above. 
  

			
	INVESTOR:
	
	PV V CE FUND, LP
		
	By:	 	AMP&A Management V, LLC, its General Partner

  

			
	By:	 	/s/ Arthur M. Pappas

 
			
	Name:	 	Arthur M. Pappas
	Title:	 	CEO & Managing Partner
		
	Address:	 	c/o Matthew Boyer
		 	 Pappas Capital, LLC
 2520 Meridian Parkway,
Suite 400
 Durham, NC 27713

mboyer@pappas-capital.com
 (919) 998-3300

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 IN WITNESS WHEREOF, the parties have executed this Right of First Refusal and Co-Sale Agreement as of the date first written above. 
  

			
	INVESTOR:
	
	JANUS HENDERSON GLOBAL LIFE SCIENCES FUND
	
	By: Janus Capital Management LLC, its
investment advisor
		
	By:	 	/s/ Andrew Acker
	Name:	 	Andrew Acker
	Title:	 	Authorized Signatory
		
	Address:	 	 c/o Janus Capital Management LLC
 151 Detroit
Street
 Denver, CO 80206

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

Perkins Coie LLP

3150 Porter Drive

Palo Alto, CA 94306

Attn: Adrian Rich

Email: arich@perkinscoie.com

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 IN WITNESS WHEREOF, the parties have executed this Right of First Refusal and Co-Sale Agreement as of the date first written above. 
  

			
	INVESTOR:
	
	JANUS HENDERSON BIOTECH INNOVATION MASTER FUND LIMITED FUND
	
	By: Janus Capital Management LLC, its
investment advisor
		
	By:	 	/s/ Andrew Acker
	Name:	 	Andrew Acker
	Title:	 	Authorized Signatory
		
	Address:	 	 c/o Janus Capital Management LLC
 151 Detroit
Street
 Denver, CO 80206

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

Perkins Coie LLP

3150 Porter Drive

Palo Alto, CA 94306

Attn: Adrian Rich

Email: arich@perkinscoie.com

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 IN WITNESS WHEREOF, the parties have executed this Right of First Refusal and Co-Sale Agreement as of the date first written above. 
  

			
	INVESTOR:
	
	JANUS HENDERSON CAPITAL
FUNDS PLC ON BEHALF OF ITS
SERIES JANUS HENDERSON
GLOBAL LIFE SCIENCES FUND
	
	By: Janus Capital Management LLC, its
investment advisor
		
	By:	 	/s/ Andrew Acker
	Name:	 	Andrew Acker
	Title:	 	Authorized Signatory
		
	Address:	 	 c/o Janus Capital Management LLC
 151 Detroit
Street
 Denver, CO 80206

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

Perkins Coie LLP

3150 Porter Drive

Palo Alto, CA 94306

Attn: Adrian Rich

Email: arich@perkinscoie.com

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 IN WITNESS WHEREOF, the parties have executed this Right of First Refusal and Co-Sale Agreement as of the date first written above. 
  

			
	 INVESTOR: 

	
	BOXER CAPITAL, LLC
		
	By:	 	/s/ Aaron Davis
	Name:	 	Aaron Davis
	Title:	 	Chief Executive Officer
		
	Address:	 	 11682 El Camino Real, Suite 320
San Diego, CA 92130

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 IN WITNESS WHEREOF, the parties have executed this Right of First Refusal and Co-Sale Agreement as of the date first written above. 
  

			
	INVESTOR:
	
	MVA INVESTORS, LLC
		
	By:	 	/s/ Aaron Davis
	Name:	 	Aaron Davis
	Title:	 	Chief Executive Officer
		
	Address:	 	11682 El Camino Real, Suite 320
San Diego, CA 92130

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 IN WITNESS WHEREOF, the parties have executed this Right of First Refusal and Co-Sale Agreement as of the date first written above. 
  

			
	INVESTOR:
	
	PFIZER VENTURES (US) LLC
		
	By:	 	/s/ Barbara Dalton, Ph.D.
	Name:	 	Barbara Dalton, Ph. D.
	Title:	 	President, Pfizer Ventures (US) LLC
		
	Address:	 	 Andrew J. Muratore, Esq.
Pfizer Inc.
235 East 42nd Street
New York, NY
10017

 [Signature Page to Right of First Refusal and Co-Sale Agreement] 

 SCHEDULE A 

INVESTORS 
 Soleus Private Equity Fund I,
L.P. 
 HBM Healthcare Investments (Cayman) Ltd. 
 Zone II
Healthcare Holdings, LLC 
 Cormorant Global Healthcare Master Fund, LP 

Cormorant Private Healthcare Fund II, LP 667, L.P. 
 Baker
Brothers Life Sciences, L.P. 
 A.M. Pappas Life Science Ventures V, LP 

PV V CEO Fund, LP 
 Janus Henderson Global Life Sciences Fund

 Janus Henderson Capital Funds Plc—Janus Henderson Global Life Sciences Fund 

Janus Henderson Biotech Innovation Master Fund Limited Fund 

Boxer Capital, LLC 
 MVA Investors, LLC 

Pfizer Ventures (US) LLC 

 SCHEDULE B 

KEY HOLDERS 
 Jay Short 

Carolyn Short 
 Scott Smith 

Biotech Investment Group, LLC 
 Himalaya Parent LLC

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