Document:

EX-10.1

 Exhibit 10.1 

AMENDED AND RESTATED 

INVESTORS’ RIGHTS AGREEMENT 

THIS AMENDED AND RESTATED INVESTORS’ RIGHTS AGREEMENT (this “Agreement”), is made as of the 5th day of March, 2021, by and among Pyxis Oncology, Inc., a Delaware corporation (the “Company”), and each of the investors listed on Schedule A hereto, each of which is
referred to in this Agreement as an “Investor”. 
 RECITALS 

WHEREAS, certain of the Investors (the “Existing Investors”) hold shares of the Series A Preferred Stock
and/or shares of Common Stock issued upon conversion thereof and possess registration rights, information rights, rights of first offer, and other rights pursuant to that certain Investors’ Rights Agreement, dated as of June 28, 2019, by
and among the Company and such Existing Investors party thereto (as amended, the “Prior Agreement”) 

WHEREAS, the Existing Investors that are a party to this Agreement and the Prior Agreement are collectively holders of
at least sixty-six percent (66%) of the then outstanding Registrable Securities (as defined in the Prior Agreement) (voting together as a single class and not as separate series and on an as converted to
Common Stock basis) held by the Existing Investors (collectively, the “Requisite Stockholders”), and desire to amend and restate the Prior Agreement in its entirety and to accept the rights created pursuant to this
Agreement in lieu of the rights granted to them under the Prior Agreement; 
 WHEREAS, the Company and certain of the
Investors are parties to that certain Series B Preferred Stock Purchase Agreement of even date herewith (the “Purchase Agreement”), under which the Company’s and such Investors’ obligations are
conditioned upon the execution and delivery of this Agreement by the Company, such Investors and the Requisite Stockholders; and 

WHEREAS, in order to induce the Company and certain of the Investors to enter into the Purchase Agreement and to purchase shares
of Series B Preferred Stock thereunder, the parties desire to enter into this Agreement to 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 certain other matters as set forth in this Agreement. 
 NOW,
THEREFORE, the Company and the undersigned Requisite Stockholders hereby agree to amend and restate the Prior Agreement in its entirety as set forth herein, and the parties to this Agreement hereby further 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 venture capital or other
investment fund or registered investment company now or hereafter existing that is controlled by one or more general partners,managing members or investment adviser of, or shares the same management company or investment adviser with, such Person.

 1.2 “Agent” means Agent Capital Fund I LP and its
Affiliates. 
 1.3 “Arix” means Arix Bioscience Holdings Limited and its Affiliates. 

1.4 “Bayer” means Bayer HealthCare LLC and its Affiliates. 

1.5 “Board” means the Company’s Board of Directors. 

1.6 “BVF” means Biotechnology Value Fund, L.P., Biotechnology Value Fund, II L.P., Biotechnology Value Trading
Fund OS, L.P., and their Affiliates. 
 1.7 “Certificate of Incorporation” means the Company’s
Amended and Restated Certificate of Incorporation, as amended and/or restated from time to time. 
 1.8 “Common
Stock” means shares of the Company’s common stock, par value $0.0001 per share. 
 1.9
“Competitor” means a Person engaged, directly or indirectly (including through any partnership, limited liability company, corporation, joint venture or similar arrangement (whether now existing or formed
hereafter)), in a business that competes with the Company’s business, but shall not include any financial investment firm or collective investment vehicle that, together with its Affiliates, holds less than twenty percent (20)% of the
outstanding equity of any Competitor and does not, nor do any of its Affiliates, have a right to designate any members of the board of directors of any Competitor. For the avoidance of doubt, neither the Investors nor their Affiliates that are
venture capital, private equity, registered investment companies or other investment firms or funds, will be deemed a Competitor for purposes hereof as a result of its investment in other companies. In addition, Pfizer (as hereinafter defined) shall
expressly not be deemed a Competitor for purposes hereof. 
 1.10 “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.

 1.11 “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. 

  
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 1.12 “Exchange Act” means the Securities Exchange Act
of 1934, as amended, and the rules and regulations promulgated thereunder. 
 1.13 “Excluded
Registration” means (i) a registration relating to the sale or grant of securities to employees of the Company or a subsidiary pursuant to a stock option, stock purchase, equity incentive 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.  

1.14 “FOIA Party” means a Person that, in the reasonable determination of the Board, may be subject to,
and thereby required to disclose non-public information furnished by or relating to the Company under, the Freedom of Information Act, 5 U.S.C. 552 (“FOIA”), any state public records access law, any
state or other jurisdiction’s laws similar in intent or effect to FOIA, or any other similar statutory or regulatory requirement.  

1.15 “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.  
 1.16
“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. 
 1.17
“GAAP” means generally accepted accounting principles in the United States as in effect from time to time. 

1.18 “HBM” means HBM Healthcare Investments (Cayman) Ltd. and its Affiliates. 

1.19 “Hillhouse” means RTV Holdings Limited. 

1.20 “Holder” means any holder of Registrable Securities who is a party to this Agreement. 

1.21 “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. 

1.22 “Initiating Holders” means, collectively, Holders who properly initiate a registration request under this
Agreement. 

  
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 1.23 “IPO” means the Company’s first underwritten
public offering of its Common Stock under the Securities Act. 
 1.24 “Janus” means Janus Henderson Capital
Funds plc – Janus Henderson Global Life Sciences Fund, Janus Henderson Global Life Sciences Fund and Janus Henderson Biotech Innovation Master Fund Limited (each, together with its (i) permitted transferees and (ii) other entities
under management by Janus Capital Management LLC, a “Janus Investor”). 
 1.25 “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). 
 1.26 “Longwood” means Longwood Fund IV,
L.P. and its Affiliates. 
 1.27 “Major Investor” means any Investor that, individually or together with
such Investor’s Affiliates, holds at least 1,822,822 shares of Registrable Securities (as adjusted for any stock split, stock dividend, combination, or other recapitalization or reclassification effected after the date hereof). 

1.28 “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. 

1.29 “Perceptive” means Perceptive Life Sciences Master Fund, Ltd. 

1.30 “Person” means any individual, corporation, partnership, trust, limited liability company, association or
other entity. 
 1.31 “Pfizer” means Pfizer Ventures (US) LLC and Pfizer Inc. and their respective
Affiliates. 
 1.32 “Preferred Director” means any director of the Company that the holders of record
of any series of Preferred Stock are entitled to elect, exclusively and as a separate series, pursuant to the Certificate of Incorporation. 

1.33 “Preferred Stock” means shares of the Company’s Series A Preferred Stock and Series B Preferred
Stock. 
 1.34 “RA Capital” means RA Capital Healthcare Fund, L.P. and RA Capital Nexus Fund II, L.P. 

  
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 1.35 “Registrable Securities” means (i) the Common
Stock issuable or issued upon conversion of the Preferred Stock 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, the shares referenced in clause (i) 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. 

1.36 “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. 

1.37 “Restricted Securities” means the securities of the Company required to be notated with the legend set
forth in Subsection 2.12(b) hereof. 
 1.38 “Requisite Preferred Directors” means a majority of the
then-serving Preferred Directors, which majority must include a majority of the then-serving Series B Directors. 
 1.39
“Requisite Series B Investors” means two of the following three Investors: (i) Arix, (ii) Pfizer and (iii) RTW. 

1.40 “Ridge back” means Ridgeback Capital Investments LP. 

1.41 “RTW” means RTW Investments, LP and its Affiliated funds, including RTW Master Fund, Ltd., RTW Innovation
Master Fund, Ltd. and RTW Venture Fund Limited. 
 1.42 “SEC” means the Securities and Exchange Commission.

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

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

1.45 “Securities Act” means the Securities Act of 1933, as amended, and the rules and regulations promulgated
thereunder. 
 1.46 “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. 
 1.47 “Series B Director” means any director of the Company that the holders of record of
Series B Preferred Stock are entitled to elect, exclusively and as a separate series, pursuant to the Certificate of Incorporation. 

  
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 1.48 “Series A Preferred Stock” means shares of the Company’s
Series A Preferred Stock, par value $0.001 per share. 
 1.49 “Series B Preferred Stock” means shares of the
Company’s Series B Preferred Stock, par value $0.001 per share. 
 1.50 “Surveyor” means Citadel Multi-Strategy
Equities Master Fund Ltd. and is Affiliates. 
 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 of (i) three (3) 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 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 at least a majority of the Registrable Securities then outstanding and held by such Holders having an anticipated
aggregate offering price of at least $15,000,000, then the Company shall (x) 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 (y) 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 thirty percent (30%) 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 $5,000,000, 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 (including the Requisite Preferred Directors) it would be materially detrimental to the Company and its
stockholders for such registration statement to either become effective or remain effective 

  
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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 period with respect to filing 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 twice 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 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) 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 (ii) if the Company has effected two 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 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); provided, that if such withdrawal is during a period the Company has deferred taking action pursuant to Subsection 2.1(c), then the Initiating Holders may withdraw
their request for registration and such registration will not 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 securities 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 

  
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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 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; provided, however, that no Holder (or any of their
assignees) shall be required to make any representations, warranties or indemnities except as they relate to such Holder’s ownership of shares and authority to enter into the underwriting agreement and to such Holder’s intended method of
distribution, and the liability of such Holder shall be several and not joint, and limited to an amount equal to the net proceeds from the offering received by such Holder. 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. 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. 
 (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 

  
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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, or (ii) the number of Registrable Securities included in the
offering be reduced below thirty percent (30%) 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. 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, 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 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; 

  
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 (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; 

(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 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. 

  
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 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
counsel for the selling Holders (“Selling Holder Counsel”), shall be borne and paid by the Company; provided, 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 registration pursuant to
Subsections 2.1(a) or 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 registration pursuant to Subsections 2.1(a) or 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 

  
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 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 except to the extent such information has been corrected in a subsequent writing prior to or concurrently with the sale of
Registrable Securities to the Person asserting the claim. 
 (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 by or on behalf of such selling Holder expressly for use in connection with such
registration and has not been corrected in a subsequent writing prior to or concurrently with the sale of Registrable Securities to the Person asserting the claim; 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 

  
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 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 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) 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. 

  
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 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). 

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 at least 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 (i) would allow such holder or
prospective holder to include such securities in any registration unless, under the terms of such agreement, such holder or prospective holder may include such securities in any such registration only to the extent that the inclusion of such
securities will not reduce the number of the Registrable Securities of the Holders that are included; or (ii) allow such holder or prospective holder to initiate a demand for registration of any securities held by such holder or prospective
holder; provided that this limitation shall not apply to Registrable Securities acquired by any additional Investor that 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 IPO (such period not to exceed one hundred eighty (180) days), (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 

  
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 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 the IPO 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 not apply to transactions (including, without limitation, any swap, hedge or similar agreement or arrangement) or announcements, in each case,
relating to securities acquired in the IPO or securities acquired in the open market or other transactions from and after the IPO or that otherwise do not involve or relate to shares of Common Stock owned by a Holder prior to the IPO, shall
apply only to the IPO, 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 trust for the direct or indirect benefit of the Holder or the immediate family of the
Holder, 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 involve a disposition for value, or the transfer of any
shares to any Affiliate of the Holder, provided that such Affiliate agrees to be bound in writing by the restrictions set forth herein, and shall be applicable to the Holders only if all officers and directors are subject to the same
restrictions and the Company shall obtain a similar agreement from all stockholders individually, and together with their Affiliates, owning more than one percent (1%) of the Company’s outstanding Common Stock (after giving effect to conversion
into Common Stock of all outstanding Preferred Stock). 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 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.
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 that are subject to agreements, based on the number of shares subject to such
agreements. 
 2.12 Restrictions on Transfer. 

(a) The 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 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. Notwithstanding the foregoing, the Company shall not require any transferee of shares pursuant to an effective registration statement, SEC Rule 144 or following the IPO, in each case,
to be bound by the terms of this Agreement. 

  
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 (b) Each certificate, instrument, or book entry representing (i) the 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 notated 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. 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 such 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 or, following the IPO, the transfer
is made pursuant to SEC Rule 144, the Holder thereof shall give notice to the Company of such Holder’s intention to effect such sale, pledge, or transfer, provided that no such notice shall be required in connection if the intended sale, pledge
or transfer complies with SEC Rule 144. 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 notice, 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 representing the Restricted Securities
transferred as above provided shall be notated with, 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 be notated with 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. 

  
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 2.13 Termination of Registration Rights. The right of any Holder to request
registration or inclusion of Registrable Securities in any registration pursuant to Subsections 2.1 or 2.2 shall terminate upon the earliest to occur of: 

(a) the closing of a Deemed Liquidation Event, as such term is defined in the Certificate of Incorporation; 

(b) such time after consummation of the IPO as SEC 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 third anniversary
of the IPO. 
 3. Information and Observer Rights. 

3.1 Delivery of Financial Statements. The Company shall deliver to each Major Investor, provided that the Board has not reasonably
determined that such Major Investor is a Competitor: 
 (a) as soon as practicable, but in any event within one hundred twenty
(120) 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 (iii) a statement of stockholders’ equity as of the
end of such year, all such financial statements (the “Annual Financials”) audited and certified by independent public accountants of nationally or regionally recognized standing selected by the Company provided,
that, the Annual Financials in respect of the fiscal year ended December 31, 2020 shall be delivered within one hundred eighty (180) days after the end of such fiscal year; 

(b) as soon as practicable, but in any event within forty-five (45) days after the end of each quarter (including the fourth quarter) of
each fiscal year of the Company, unaudited statements of income and 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 forty-five (45) days after the end of each quarter 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 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; 

  
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 (d) as soon as practicable, but in any event within thirty (30) days of the end of
each month, an unaudited income statement for such month, and an unaudited balance sheet 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); 

(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 Requisite Preferred 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 including, without limitation, statements of stockholder equity or copies of minutes of
meetings of, or fully executed unanimous written consents of, the Board of Directors; 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 a 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 to the contrary in this Subsection 3.1, the Company shall not be
obligated to provide the following information to the Major Investors pursuant to this Subsection 3.1: (i) any materials distributed to, or presented at a meeting of, the Board of Directors (whether formally or informally), (ii) materials
prepared for the Company’s Scientific Advisory Board; (iii) any research results, pre-clinical results or clinical results; or (iv) any materials regarding any discussions relating to any
financing, collaboration, merger or acquisition involving the Company (provided that the Company shall provide any materials as may be required by law or the Transaction Agreements in order to (x) obtain the requisite consent of the
stockholders for any of the foregoing transactions to the extent such consent is required), and (y) to permit the Major Investors to assess the terms of such financing in order to determine whether such Major Investor desires to exercise its
rights in accordance with Section 4 hereof). 

  
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 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 sixty (60) 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), 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. 
 3.3 Observer Rights. 

(a) As long as Bayer owns any shares of Preferred Stock (or Common Stock issued upon conversion thereof), the Company shall invite a
representative of Bayer to attend all non-executive session meetings of the Board (and of each committee of the Board, if any) 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 (i) such representative shall agree to
hold in confidence and trust with respect to all information so provided; and (ii) 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. 

(b) As long as Agent owns any shares of Preferred Stock (or Common Stock issued upon conversion thereof), the Company shall invite a
representative of Agent to attend all non-executive session meetings of the Board (and of each committee of the Board, if any) 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 (i) such representative shall agree to
hold in confidence and trust with respect to all information so provided; and (ii) 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. 

  
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 (c) As long as Arix owns any shares of Preferred Stock (or Common Stock issued upon
conversion thereof), the Company shall invite a representative of Arix to attend all non-executive session meetings of the Board (and of each committee of the Board, if any) 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
(i) such representative shall agree to hold in confidence and trust with respect to all information so provided; and (ii) 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. 

(d) As long as a Janus Investor owns any shares of Preferred Stock (or Common Stock issued upon conversion thereof), the Company shall invite
a representative of Janus to attend all non-executive session meetings of the Board (and of each committee of the Board, if any) 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 (i) such representative shall agree to
hold in confidence and trust with respect to all information so provided; and (ii) 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. 

(e) As long as RTW owns any shares of Preferred Stock (or Common Stock issued upon conversion thereof), the Company shall invite a
representative of RTW to attend all non-executive session meetings of the Board (and of each committee of the Board, if any) 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 (i) such representative shall agree to
hold in confidence and trust with respect to all information so provided; and (ii) 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. 

(f) As long as Perceptive owns any shares of Preferred Stock (or Common Stock issued upon conversion thereof), the Company shall invite a
representative of Perceptive to attend all non-executive session meetings of the Board (and of each committee of the Board, if any) 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 (i) such representative shall agree to
hold in confidence and trust with respect to all information so provided; and (ii) 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. 

  
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 (g) As long as Hillhouse owns any shares of Preferred Stock (or Common Stock issued upon
conversion thereof), the Company shall invite a representative of Hillhouse to attend all non-executive session meetings of the Board (and of each committee of the Board, if any) 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 (i) such representative shall agree to hold in confidence and trust with respect to all information so provided; and (ii) 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. 

(h) As long as HBM owns any shares of Preferred Stock (or Common Stock issued upon conversion thereof), the Company shall invite a
representative of HBM to attend all non-executive session meetings of the Board (and of each committee of the Board, if any) 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 (i) such representative shall agree to
hold in confidence and trust with respect to all information so provided; and (ii) 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. 

(i) As long as RA Capital owns any shares of Preferred Stock (or Common Stock issued upon conversion thereof), the Company shall invite a
representative of RA Capital to attend all non-executive session meetings of the Board (and of each committee of the Board, if any) 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 (i) such representative shall agree to
hold in confidence and trust with respect to all information so provided; and (ii) 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. 

(j) As long as BVF owns any shares of Preferred Stock (or Common Stock issued upon conversion thereof), the Company shall invite a
representative of BVF to attend all non-executive session meetings of the Board (and of each committee of the Board, if any) 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 (i) such representative shall agree to
hold in confidence and trust with respect to all information so provided; and (ii) 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. 

  
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 (k) As long as Ridgeback owns any shares of Preferred Stock (or Common Stock issued upon
conversion thereof), the Company shall invite a representative of Ridgeback to attend all non-executive session meetings of the Board (and of each committee of the Board, if any) 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 (i) such representative shall agree to hold in confidence and trust with respect to all information so provided; and (ii) 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 Subsection 3.1, Subsection 3.2 and
Subsection 3.3 shall terminate and be of no further force or effect (i) immediately before the consummation of the IPO, as such term is defined in the Certificate of Incorporation, or (ii) upon a Deemed Liquidation Event, as such
term is defined in the Certificate of Incorporation, whichever event occurs first. 
 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 such Investor without use of the Company’s confidential information, or (c) is or has been made known or disclosed to such 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 the extent necessary in connection with such Investor’s tax filings, financial and other reporting
(including with the SEC) and accounting matters; (iii) 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; (iv)
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; (v) 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 or the confidential information obtained from the Company pursuant to the terms of the Agreement, including, without limitation, quarterly or annual reports; or (vi) as may otherwise be required by law,
regulation, rule, court order or subpoena, provided that, with respect to this clause (vi), such Investor promptly notifies the Company of such disclosure and takes reasonable steps to minimize the extent of any such required
disclosure.     

  
 22 

 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 (x) is not a Competitor or FOIA Party, unless such party’s purchase of New Securities is otherwise consented to by the
Board (including the Requisite Preferred Directors), and (y) agrees to enter into this Agreement and each of the Voting Agreement and Right of First Refusal and Co-Sale Agreement of even date herewith
among the Company, the Investors and the other parties named therein, as an “Investor” under each such agreement (provided that any Competitor or FOIA Party shall not be entitled to any rights as a Major Investor under
Subsections 3.1, 3.2 and 4.1 hereof. 
 (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 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 Preferred Stock and 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 the 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
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). 

  
 23 

 (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. 
 (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. 

(e) Notwithstanding any provision hereof to the contrary, in lieu of complying with the provisions of this Subsection 4.1, the Company
may elect to give notice to the Major Investors within thirty (30) days after the issuance of New Securities. Such notice shall describe the type, price, and terms of the New Securities. Each Major Investor shall have twenty (20) days from
the date notice is given to elect to purchase up to the number of New Securities that would, if purchased by such Major Investor, maintain such Major Investor’s percentage-ownership position, calculated as set forth in Subsection 4.1(b)
before giving effect to the issuance of such New Securities.     
 4.2 Termination. The covenants set forth in
Subsection 4.1 shall terminate and be of no further force or effect (i) immediately before the consummation of the IPO, or (ii) upon a Deemed Liquidation Event, as such term is defined in the Certificate of Incorporation, whichever
event occurs first. 
 5. Additional Covenants. 

5.1 Director and Officer Insurance. The Company shall obtain, within sixty (60) days of the date hereof, from financially sound
and reputable insurers, Directors and Officers liability insurance in an amount of at least five million ($5,000,000) and on terms and conditions satisfactory to the Board (including all Preferred Directors), and will cause such insurance policy to
be maintained until such time as the Board (including all Preferred Directors) determines that such insurance should be discontinued. The Directors and Officers liability insurance policy shall not be cancelable by the Company without prior approval
by the Board, including all Preferred Directors. The Company hereby agrees that its Directors and Officers liability insurance policy shall be reviewed and approved prior to an IPO and increased as may be determined by the Board (including the
Requisite Preferred Directors). 

  
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 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 non-solicitation agreement, substantially in the form approved by the Board (including a majority of the Preferred
Directors). In addition, the Company shall not amend, modify, terminate, waive, or otherwise alter, in whole or in part, any material provision of the above-referenced agreements or any restricted stock agreement between the Company and any
employee, without the consent of the Board, which consent shall include the Requisite Preferred Directors.     
 5.3
Employee Stock. Unless otherwise approved by the Board (including the Requisite Preferred 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 twelve (12) months 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. Without the prior approval by the Board (including the Requisite Preferred Directors), the Company shall not
amend, modify, terminate, waive or otherwise alter, in whole or in part, any stock purchase, stock restriction or option agreement with any existing employee or service provider if such amendment would cause it to be inconsistent with this
Subsection 5.3. In addition, unless otherwise approved by the Board (including the Requisite Preferred Directors), the Company (x) shall not offer or allow any acceleration of vesting, and (y) shall retain (and not waive) 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. 

5.4 Reserved. 
 5.5
Matters Requiring Preferred Director Approval. So long as the holders of Preferred Stock are entitled to elect a Preferred Director, the Company hereby covenants and agrees with each of the Investors that it shall not, without approval of the
Board, which approval must include the affirmative vote of the Requisite Preferred Directors: 
 (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 (including the Requisite Preferred Directors); 

  
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 (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 (including the Requisite Preferred Directors); 
 (e)
incur any aggregate indebtedness in excess of $250,000 that is not already included in a budget approved by the Board (including the Requisite Preferred Directors); 

(f) otherwise enter into or be a party to any transaction with any director, officer, consultant or employee of the Company or any
“associate” (as defined in Rule 12b-2 promulgated under the Exchange Act) of any such Person, including without limitation any “management bonus” or similar plan providing payments to
employees in connection with a Deemed Liquidation Event, as such term is defined in the Certificate of Incorporation, except for transactions made in the ordinary course of business and pursuant to reasonable requirements of the Company’s
business and upon fair and reasonable terms that are approved by a majority of the disinterested members of the Board who have no direct economic interest in the transaction and no affiliation (other than representation on the Board) with any entity
that (i) is a party to the transaction or (ii) is affiliated with a party to the transaction; 
 (g) hire, terminate, or change
the compensation of the executive officers, including approving any option grants or stock awards to executive officers; 
 (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 any corporate strategic relationship involving the payment, contribution, or assignment by the Company or to the Company of
money or assets greater than $500,000; or 
 (j) change the principal business of the Company, enter new lines of business, or exit the
current line of business. 
 5.6 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. Any Board Committee shall
include at least two (2) Preferred Directors, at least one (1) of whom shall be a Series B Director. 
 5.7 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, its Certificate of Incorporation, or elsewhere, as the case may be. 

  
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 5.8 Indemnification Matters. The Company hereby acknowledges that one (1) or
more of the directors nominated to serve on the Board by the Investors (each an “Investor 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 “Investor Indemnitors”). The Company hereby agrees (a) that it is the indemnitor of first resort (i.e., its obligations to any such Investor Director are
primary and any obligation of the Investor Indemnitors to advance expenses or to provide indemnification for the same expenses or liabilities incurred by such Investor Director are secondary), (b) that it shall be required to advance the full amount
of expenses incurred by such Investor 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 Investor Director to the extent legally permitted and as
required by the Certificate of Incorporation or Bylaws of the Company (or any agreement between the Company and such Investor Director), without regard to any rights such Investor Director may have against the Investor Indemnitors, and,
(c) that it irrevocably waives, relinquishes and releases the Investor Indemnitors from any and all claims against the Investor 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 Investor Indemnitors on behalf of any such Investor Director with respect to any claim for which such Investor Director has sought indemnification from the Company shall affect the foregoing and the
Investor 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 Investor Director against the Company. The Investor Directors and the Investor
Indemnitors are intended third-party beneficiaries of this Subsection 5.8 and shall have the right, power and authority to enforce the provisions of this Subsection 5.8 as though they were a party to this Agreement. 

5.9 Right to Conduct Activities. 

(a) The Company hereby agrees and acknowledges that each of Longwood (together with its Affiliates), Arix (together with its Affiliates),
Surveyor (together with its Affiliates), Perceptive (together with its Affiliates), Pfizer (together with its Affiliates), Bayer (together with its Affiliates), the Tekla Funds (as hereinafter defined) (together with their Affiliates), RTW (together
with its Affiliates), RA Capital (together with its Affiliates), HBM (together with its Affiliates) and Janus and each Janus Investor (together with its Affiliates) is a professional investment organization or otherwise engages in investment
activities in the ordinary course of business, and as such reviews the business plans and related proprietary information of many enterprises, some of which may compete directly or indirectly with the Company’s business (as currently conducted
or as currently propose to be conducted). Nothing in this Agreement shall preclude or in any way restrict the Investors from evaluating or purchasing securities, including publicly traded securities, of a particular enterprise, or investing or
participating in any particular enterprise whether or not such enterprise has products or services which compete with those of the Company; and the Company hereby agrees that, to the extent permitted under applicable law, none of Longwood (together
with its Affiliates), Arix (together with its Affiliates), Surveyor (together with its Affiliates), Perceptive (together with its 

  
 27 

 
Affiliates), Pfizer (together with its Affiliates), Bayer (together with its Affiliates), the Tekla Funds (together with their Affiliates), RTW (together with its Affiliates), RA Capital
(together with its Affiliates), HBM (together with its Affiliates) or Janus and each Janus Investor (together with its Affiliates) shall 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, employee 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. 
 (b) The Company and each Investor acknowledges and agrees that (i) certain of the Investors (or
the Affiliates of such Investors) (each, a “Strategic Investor”) 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, and (ii) any
employee of such Strategic Investor serving on the Board is serving in such capacity at the request, and for the benefit, of the Company. Accordingly, such Strategic Investor’s designation of any individual to the Board (the
“Board Designee”), the service of such Board Designee on the Board, or the exercise by such Strategic Investor of any rights under this Agreement or any of the Transaction Agreements (as defined in the Purchase Agreement),
shall not in any way preclude or restrict such Strategic Investor 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 (i) result in a violation of the confidentiality provisions of this Agreement or any other Transaction Agreement (as defined in the Purchase Agreement) or
(ii) violate any applicable fiduciary duties of such Board Designee; provided, that, the Company shall be entitled to (i) withhold from any such Board Designee any board materials or information the disclosure of which the Board
determines, in good faith and upon the advice of counsel, would create a conflict of interest, and (ii) exclude any such Board Designee from any board meeting or portion thereof if the Board determines, in good faith and upon the advice of
counsel, that the presence of such Board Designee at such board meeting or portion thereof would create a conflict of interest between the Investor appointing such Board Designee and the Company; provided, however, that board materials
or information regarding the issuance of New Securities, and meetings (or portions thereof) with respect to the same, will not be deemed to create a conflict of interest for purposes of this Section 5.9. 

5.10 Expenses of Counsel. In the event of a transaction which is a Sale of the Company (as defined in the Amended and Restated Voting
Agreement of even date herewith among the Investors, the Company and the other parties named therein), the reasonable fees and disbursements, not to exceed $75,000 of one counsel for the Investors (“Investor Counsel”), in
their capacities as stockholders, shall be borne and paid by the Company. Unless 

  
 28 

 
as otherwise prohibited as set forth herein, at the outset of considering a transaction which, if consummated would constitute a Sale of the Company, the Company shall obtain the ability to share
with the Investor Counsel (and such counsel’s clients) and shall share the confidential information (including, without limitation, the initial and all subsequent drafts of memoranda of understanding, letters of intent and other transaction
documents and related noncompete, employment, consulting and other compensation agreements and plans) pertaining to and memorializing any of the transactions which, individually or when aggregated with others would constitute the Sale of the
Company. The Company shall be obligated to share (and cause the Company’s counsel and investment bankers to share) such materials when distributed to the Company’s executives and/or any one (1) or more of the other parties to such
transaction(s). In the event that Investor Counsel deems it appropriate, in its reasonable discretion, to enter into a joint defense (or common interest) agreement or other arrangement to enhance the ability of the parties to protect their
communications and other reviewed materials under the attorney client privilege, the Company shall, and shall direct its counsel to, execute and deliver to Investor Counsel and its clients such an agreement in form and substance reasonably
acceptable to Investor Counsel, its clients and the Company’s counsel. In the event that one (1) or more of the other party or parties to such transactions require the clients of Investor Counsel to enter into a confidentiality agreement
and/or joint defense (or common interest) agreement in order to receive such information, then, subject to the other terms of this Agreement, the Company shall share whatever information can be shared without entry into such agreement and shall, at
the same time, in good faith work expeditiously to enable Investor Counsel and its clients to negotiate and enter into the appropriate agreement(s) without undue burden to the clients of Investor Counsel, such agreement(s) to be in form and
substance acceptable to each client. Without derogating from any of the foregoing, the Company agrees that copies of any and all materials provide to Investor Counsel shall also be provided to a counsel designated by the Tekla Funds for review,
provided that the Tekla Funds shall be responsible for any and all costs (including attorney’s fees) relating to such review by their counsel. 

5.11 FCPA. The Company covenants that it shall not (and shall not permit any of its subsidiaries or Affiliates or any of its or their
respective directors, officers, managers, employees, independent contractors, representatives or agents to) promise, authorize or make any payment to, or otherwise contribute any item of value to, directly or indirectly, to any third party,
including any Non-U.S. Official (as such term is defined in the U.S. Foreign Corrupt Practices Act of 1977, as amended (the “FCPA”)), in each case, in violation of the FCPA, the U.K. Bribery Act, or
any other applicable anti-bribery or anti-corruption law. The Company further covenants that it 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 their respective directors, officers, managers, employees, independent contractors, representatives or agents in violation of the FCPA, the U.K. Bribery Act, or any other applicable
anti-bribery or anti-corruption law. The Company further covenants that it shall (and shall cause each of its subsidiaries and Affiliates to) maintain systems of internal controls (including, but not limited to, accounting systems, purchasing
systems and billing systems) to ensure compliance with the FCPA, the U.K. Bribery Act, or any other applicable anti-bribery or anti-corruption law. Upon request, the Company agrees to provide responsive information and/or certifications concerning
its compliance with applicable anti-corruption laws. The Company shall promptly notify each Investor if the Company becomes 

  
 29 

 
aware of any Enforcement Action (as defined in the Purchase Agreement). The Company shall, and shall cause any direct or indirect subsidiary or entity controlled by it, whether now in existence
or formed in the future, to comply with the FCPA. The Company shall use its best efforts to cause any direct or indirect subsidiary, whether now in existence or formed in the future, to comply in all material respects with all applicable laws. 

5.12 Defense Production Act. To the extent that the Company engages in the design, fabrication, development, testing, production or
manufacture of critical technologies within the meaning of the DPA (as defined in the Purchase Agreement), whether because of a new categorization of technology by the U.S. government or otherwise, the Company shall promptly provide notice to the
Major Investors. 
 5.13 Termination of Covenants. All of the covenants set forth in this Section 5, except for Subsections
5.7, 5.8 and 5.10, shall terminate and be of no further force or effect (i) immediately before the consummation of the IPO or (ii) upon a Deemed Liquidation Event, as such term is 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 that (i) is an Affiliate of a Holder; (ii) is 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 (iii) has obtained the consent of the Board (including the Requisite Preferred Directors), and after such transfer, holds at least 500,000 shares of Registrable Securities (subject to appropriate adjustment for stock splits, stock dividends,
combinations, and other recapitalizations); provided, however, that (x) the Company is, within a reasonable time 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 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. The terms and conditions of this Agreement inure to the benefit of and are binding 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. 

  
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 6.2 Governing Law. This Agreement shall be governed by the internal law of the State
of Delaware, without regard to conflict of law principles that would result in the application of any law other than the law of the State of Delaware. 

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.     

(a) 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; (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 Schedule A hereto, 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
Gunderson Dettmer Stough Villeneuve Franklin & Hachigian, LLP, One Marina Park Drive, Suite 900, Boston, MA 02210, Attention: Timothy H. Ehrlich. If notice is given to the Investors, a copy shall also be sent to Goodwin Procter, LLP, 100
Northern Avenue, Boston, MA 02210, Attention: *** (email: ***). Notwithstanding any of the foregoing, with respect to HBM, 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: ***. 

  
 31 

 (b) Consent to Electronic Notice. Each Investor consents to the delivery of any
stockholder notice pursuant to the Delaware General Corporation Law (the “DGCL”), as amended or superseded from time to time, by electronic transmission pursuant to Section 232 of the DGCL (or any successor thereto) at the
electronic mail address or the facsimile number set forth below such Investor’s name on Schedule A hereto, as updated from time to time by notice to the Company, or as on the books of the Company. To the extent that any notice given by
means of electronic transmission is returned or undeliverable for any reason, the foregoing consent shall be deemed to have been revoked until a new or corrected electronic mail address has been provided, and such attempted electronic notice shall
be ineffective and deemed to not have been given. Each Investor agrees to promptly notify the Company of any change in such stockholder’s electronic mail address, and that failure to do so shall not affect the foregoing. 

6.6 Amendments and Waivers. Any term of this Agreement may be amended, modified or terminated 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 at least a majority of the then outstanding Registrable Securities,
which majority must include the Requisite Series B Investors (voting together as a single class and not as separate series and on an as converted to Common Stock basis) (the “Requisite Preferred Holders”); 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); 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, (a) this
Agreement may not be amended, modified 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, modification, termination, or waiver
applies to all Investors in the same fashion (it being agreed that 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), (b) the definition of Bayer, Subsection 3.3(a) and this clause (b) of this Subsection
6.6 may not be amended, modified, terminated or waived without the written consent of Bayer, (c) Subsection 3.3(b) and this clause (c) of this Subsection 6.6 may not be amended, modified, terminated or waived without the
written consent of Agent, (d) the definition of Surveyor, the definition of Competitor (as it relates to Surveyor), Subsection 5.9 (as it relates to Surveyor) and this clause (d) of this Subsection 6.6, (e) the definition of
Arix, the definition of Competitor (as it relates to Arix), Subsection 3.3(c), Subsection 5.1, Subsection 5.9 (as it relates to Arix) and this clause (e) of this Subsection 6.6 may not be amended, modified,
terminated or waived without the written consent of Arix, (f) the definition of Pfizer, the definition of Competitor (as it relates to Pfizer), Subsection 5.1, Subsection 5.9 (as it relates to Pfizer), Subsection 5.11 and
this clause (f) of this Subsection 6.6 may not be amended, modified, terminated or waived without the written consent of Pfizer, (g) the definition of Janus, the definition of Competitor (as it relates to Janus), Subsection
3.3(d), Subsection 5.9 (as it relates to Janus) and this clause (g) of this Subsection 6.6 may not be amended, modified, terminated or waived without the written consent of Janus, (h) the definition of RTW, the definition
of Competitor (as it relates to RTW), Subsection 3.3(e), Subsection 5.1, Subsection 5.9 (as it relates to RTW) and this clause (h) of this Subsection 6.6 may not be amended, modified, terminated or waived without the
written 

  
 32 

 consent of RTW, (i) the definition of BVF, Subsection 3.3(j) and this clause (i) of this
Subsection 6.6 may not be amended, modified, terminated or waived without the written consent of BVF, (j) the definition of Hillhouse, Subsection 3.3(g) and this clause (j) of this Subsection 6.6 may not be amended,
modified, terminated or waived without the written consent of Hillhouse, (k) the definition of HBM, Subsection 3.3(h), Subsection 5.9 (as it relates to HBM) and this clause (k) of this Subsection 6.6 may not be amended,
modified, terminated or waived without the written consent of HBM, (l) the definition of RA Capital, Subsection 3.3(i) and this clause (l) of this Subsection 6.6 may not be amended, modified, terminated or waived without the
written consent of RA Capital, (m) the definition of Perceptive, Subsection 3.3(f) and this clause (m) of this Subsection 6.6 may not be amended, modified, terminated or waived without the written consent of Perceptive,
(n) Subsection 5.9 (as it relates to the Tekla Funds), Subsection 5.10 (as it relates to the Tekla Funds), Subsection 6.14 and this clause (n) of this Subsection 6.6 may not be amended, modified, terminated or
waived without the written consent of the Tekla Funds, (o) the definition of Ridgeback, Subsection 3.3(k) and this clause (o) of this Subsection 6.6 may not be amended, modified, terminated or waived without the written
consent of Ridgeback; and (p) in the event any Major Investor (or any of their respective Affiliates) purchases any New Securities in any issuance of New Securities by the Company following an amendment, modification, termination, or waiver of
Section 4 (a “Participating Investor”), then each other Major Investor (each, a “Non-Participating Investor”) shall be given the opportunity
to participate in such offering and to purchase the same proportion (up to 100%) of such Non-Participating Investor’s pro rata share of the New Securities being offered by the Company in the relevant transaction as is being purchased by the
Participating Investor purchasing the largest proportion of such Participating Investor’s pro rata share; provided further that each Non-Participating Investor’s pro rata participation amount
shall in no event exceed the amount such Non-Participating Investor would have been entitled to purchase pursuant to Section 4 had such amendment, modification, termination or waiver not have been
obtained. This sentence, and Subsection 6.6(p), may not be amended, modified, waived or terminated with respect to any Non-Participating Investor without the prior written consent of such Non-Participating Investor, and the Company may not (x) amend, modify, terminate, or waive any portion of Section 4, or any defined term used therein, if the effect of such amendment, modification,
termination or waiver is to deny a Non-Participating Investor the right to participate in a future bona fide financing on the terms set forth in Section 4 and Subsection 6.6(p) (unless any
such amendment, modification, termination, or waiver has been consented to in writing by such Non-Participating Investor) or (y) amend or modify Article FOURTH, Section 4.4.1(d) of the
Certificate of Incorporation to include any securities not already listed therein as of the date hereof if the effect of such amendment or modification is to permit the Company to issue securities in a bona fide financing without providing each
Major Investor the opportunity to purchase its pro rata share of such securities pursuant to the preemptive rights provisions set forth in Section 4 and this Subsection 6.6(p) (unless any such amendment or modification has been
consented to in writing by each Major Investor that has not been provided with such opportunity). Notwithstanding the foregoing, Schedule A hereto may be amended by the Company from time to time to add transferees of any Registrable
Securities in compliance with the terms of this Agreement without the consent of the other parties, and Schedule A hereto may also be amended by the Company after the date of this Agreement without the consent of the other parties to add
information regarding any additional Investor who becomes a party to this Agreement in accordance with Subsection 6.9. The Company shall give prompt notice of any amendment, modification or 

  
 33 

 
termination hereof or waiver hereunder to any party hereto that did not consent in writing to such amendment, modification, termination, or waiver. Any amendment, modification, 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. 
 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 Preferred Stock after the date hereof, whether pursuant to the Purchase Agreement or otherwise, any purchaser of such shares of 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) together with the Transaction Agreements (as
defined in the Purchase Agreement) 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. 

  
 34 

 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. 
 The prevailing
party shall be entitled to reasonable attorney’s fees, costs, and necessary disbursements in addition to any other relief to which such party may be entitled. Each of the parties to this Agreement consents to personal jurisdiction for any
equitable action sought in the U.S. District Court for the District of Delaware or any court of the State of Delaware having subject matter jurisdiction. 

6.12 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. 
 6.13 Effect on Prior Agreement. Upon the
effectiveness of this Agreement, the Prior Agreement shall be superseded and replaced in its entirety by this Agreement and shall be of no further force or effect.     

6.14 Tekla Funds. A copy of the Declaration of Trust, as amended and restated, for each of Tekla Healthcare Investors and Tekla Life
Sciences Investors (together, the “Tekla Funds”) is on file with the Secretary of State of The Commonwealth of Massachusetts, and notice is hereby given that this Agreement is executed on behalf of the Tekla Funds by an officer or
trustee of the Tekla Funds in his or her capacity as an officer or trustee of the Tekla Funds, and not individually and that the obligations of or arising out of this Agreement are not binding upon any of the trustees, officers or shareholders
individually but are binding only upon the assets and property of each of the respective Tekla Funds. 
 [Remainder of Page
Intentionally Left Blank] 

  
 35 

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

			
	COMPANY:
	
	PYXIS ONCOLOGY, INC.

 
			
		
	By:	 	/s/ Lara Sullivan

 
			
	Name:	 	Lara Sullivan
	Title:	 	Chief Executive Officer

 SIGNATURE PAGE TO AMENDED
AND RESTATED 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

 
			
	Name:	 	Barbara Dalton, Ph.D.
	Title:	 	President

  

			
	PFIZER INC.
		
	By:	 	/s/ Barbara Dalton

 
			
	Name:	 	Barbara Dalton, Ph.D.
	Title:	 	Vice President

 SIGNATURE PAGE TO AMENDED
AND RESTATED INVESTORS’ RIGHTS AGREEMENT 

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

			
	INVESTOR:
	
	LEGOCHEM BIOSCIENCES, INC.
		
	By:	 	/s/ Yong-Zu Kim

 
			
	Name:	 	Yong-Zu Kim
	Title:	 	CEO & President

  

			
	Address:	 	8-26 Munpyeongseo-ro Daedeok-gu
		 	Daejeon, 34302, South Korea
	E-mail:	 	 ***

 SIGNATURE PAGE TO AMENDED
AND RESTATED INVESTORS’ RIGHTS AGREEMENT 

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

			
	IKVESTOR:
	
	BIOTECHNOLOGY VALUE FUND, L.P.

 
			
		
	By:	 	 /s/ Mark Lampert

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

 
			
		
	By:	 	 /s/ Mark Lampert

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

 
			
		
	By:	 	 /s/ Mark Lampert

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

 SIGNATURE PAGE TO AMENDED
AND RESTATED INVESTORS’ RIGHTS AGREEMENT 

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

			
	INVESTOR:
	
	CORMORANT PRIVATE HEALTHCARE FUND III, LP

 
			
		
	By:	 	Cormorant Private Healthcare GP Ill, LLC

 
			
		
	By:	 	 /s/ Bihua Chen

		 	Bihua Chen, Managing Member

 
			
	
	CORMORANT GLOBAL HEALTHCARE MASTER FUND, LP
	
	By: Cormorant Global GP, LLC

 
			
		
	By:	 	 /s/ Bihua Chen

		 	Bihua Chen, Managing Member

 
			
	
	CRMA SPV, L.P.
	
	By: Cormorant Asset Management, LP, Its attorney-in-fact

 
			
		
	By:	 	 /s/ Bihua Chen

		 	Bihua Chen, Managing Member

 SIGNATURE PAGE TO AMENDED
AND RESTATED 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:	 	Managing Director

  
 SIGNATURE
PAGE TO AMENDED AND RESTATED INVESTORS’ RIGHTS AGREEMENT 

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

			
	 INVESTOR:

	
	 IPSEN FARMACEUTICA BV

	
	By: Ipsen SA

 
			
	
	 /s/ François Garnier

	Name:	 	François Garnier
	Title:	 	EVP, General Counsel

  

			
	By: Ipsen Farmaceutica BV

 
			
	
	 /s/ Jeroen Murk

	Name:	 	Jeroen Murk
	Title:	 	General Manager, The netherlands

  
 SIGNATURE
PAGE TO AMENDED AND RESTATED INVESTORS’ RIGHTS AGREEMENT 

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

			
	INVESTOR:
	
	JOHN FLAVIN
		
	By:	 	/s/ John Flavin

 
			
	Name:	 	John Flavin

  
 SIGNATURE
PAGE TO AMENDED AND RESTATED INVESTORS’ RIGHTS AGREEMENT 

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

			
	INVESTOR:
	
	JOE MANSUETO
		
	By:	 	/s/ Joe Mansueto
	 Name: Joe Mansueto

  

  

SIGNATURE PAGE TO AMENDED AND RESTATED
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

  

			
	JANUS HENDERSON GLOBAL LIFE SCIENCES FUND

 
			
	
	By: Janus Capital Management LLC, its investment advisor
		
	 By:
	 	/s/ Andrew Acker

 
			
	Name:	 	Andrew Acker
	Title:	 	Authorized Signatory

  

			
	JANUS HENDERSON BIOTECH INNOVATION MASTER FUND LIMITED
	
	By: Janus Capital Management LLC, its investment advisor

 
			
		
	 By:
	 	/s/ Andrew Acker

 
			
	Name:	 	Andrew Acker
	Title:	 	Authorized Signatory

  

  

SIGNATURE PAGE TO AMENDED AND RESTATED
INVESTORS’ RIGHTS AGREEMENT 

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

			
	INVESTOR:
	
	LAURION CAPITAL

 
			
	
	Laurion Capital Master Fund Ltd.
		
	By:	 	/s/ Daniel Woelfel

 
			
	Name:	 	Daniel Woelfel
	Title:	 	Director

  

  

SIGNATURE PAGE TO AMENDED AND RESTATED
INVESTORS’ RIGHTS AGREEMENT 

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

			
	INVESTOR:
	
	LIFESCI VENTURE PARTNERS II, LP
		
	By:	 	/s/ Paul Yook
	Name:	 	Paul Yook
	Title:	 	Managing Member

  

  

SIGNATURE PAGE TO AMENDED AND RESTATED
INVESTORS’ RIGHTS AGREEMENT 

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

			
	INVESTOR:
	
	LOGOS OPPORTUNITIES FUND II, L.P.

 
			
	
	BY: LOGOS OPPORTUNITIES GP, LLC
	ITS GENERAL PARTNER
		
	By:	 	/s/ Graham Walmsley

 
			
	Name:	 	Graham Walmsley
	Title:	 	Managing Member

 
			
		
	Address:	 	1 Letterman Drive
		 	Building D, Suite D3-700
		 	San Francisco, CA 94129

 
			
		
	By:	 	/s/ Arsani William

 
			
	Name:	 	Arsani William
	Title:	 	Managing Partner

 
			
		
	Address:	 	1 Letterman Drive
		 	Building D, Suite D3-700
		 	San Francisco, CA 94129

  

  

SIGNATURE PAGE TO AMENDED AND RESTATED
INVESTORS’ RIGHTS AGREEMENT 

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

			
	INVESTOR:
	
	LONGWOOD FUND IV, L.P.

 
			
	
	By: Longwood Fund IV GP, LLC, its General Partner
		
	By:	 	/s/ John Lawrence

 
			
	Name:	 	John Lawrence
	Title:	 	CFO

  

  

SIGNATURE PAGE TO AMENDED AND RESTATED
INVESTORS’ RIGHTS AGREEMENT 

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

			
	INVESTOR:
	
	MAROON PARTNERS LLC DEFINED BENEFIT PLAN
		
	By:	 	/s/ Scott Meadow
	Name:	 	Scott Meadow
	Title:	 	Managing Partner

  

  

SIGNATURE PAGE TO AMENDED AND RESTATED
INVESTORS’ RIGHTS AGREEMENT 

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

			
	INVESTOR:
	
	PERCEPTIVE LIFE SCIENCES MASTER
FUND, LTD.
	By: Perceptive Advisors, LLC
		
	By:	 	/s/ James H. Mannix
	Name:	 	James H. Mannix
	Title:	 	COO

  

SIGNATURE PAGE TO AMENDED AND RESTATED
INVESTORS’ RIGHTS AGREEMENT 

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

			
	INVESTOR:
	
	RA CAPITAL NEXUS FUND II, L.P.
	
	By: RA Capital Nexus Fund II GP, LLC
	Its: General Partner

 
			
		
	By:	 	/s/ Peter Kolchinsky

 
			
	Name: Peter Kolchinsky
	Title: Manager

 
			
		
	Address:	 	RA Capital Management, L.P.
200 Berkeley Street
18th Floor
Boston, MA 02116
Attn: General Counsel

  

SIGNATURE PAGE TO AMENDED AND RESTATED
INVESTORS’ RIGHTS AGREEMENT 

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

			
	 INVESTOR:

	
	 RA CAPITAL HEALTHCARE FUND, L.P.

	
	By: RA Capital Healthcare Fund GP, LLC
	Its: General Partner

 
			
		
	By:	 	/s/ Peter Kolchinsky

 
			
	Name: Peter Kolchinsky

 
			
	Title: Manager

 
			
		
	Address:	 	RA Capital Management, L.P.
200 Berkeley Street
18th Floor
Boston, MA 02116
Attn: General Counsel

  

SIGNATURE PAGE TO AMENDED AND RESTATED
INVESTORS’ RIGHTS AGREEMENT 

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

			
	INVESTOR:
	
	 RIDGEBACK CAPITAL INVESTMENTS LP

	
	 By: RIDGEBACK CAPITAL MANAGEMENT LLC its Fund Manager:

		
	    By:	 	/s/ Christian Sheldon
		 	Christian Sheldon / COO

  

SIGNATURE PAGE TO AMENDED AND RESTATED
INVESTORS’ RIGHTS AGREEMENT 

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

			
	 INVESTOR:

	
	 RTW MASTER FUND, LTD.

		
	 By:
	 	/s/ Roderick Wong
	 Name: Roderick Wong, M.D.

	 Title: Director

  

			
	 RTW INNOVATION MASTER FUND, LTD.

		
	 By:
	 	/s/ Roderick Wong
	 Name: Roderick Wong, M.D.

	 Title: Director

  

			
	 RTW VENTURE FUND LIMITED

	
	 By: RTW Investments, LP, its Investment Manager

		
	 By:
	 	/s/ Roderick Wong
	 Name: Roderick Wong, M.D.

	 Title: Managing Partner

  

SIGNATURE PAGE TO AMENDED AND RESTATED
INVESTORS’ RIGHTS AGREEMENT 

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

			
	 INVESTOR:

	
	 SKYDECK HOLDINGS II LLC

	
	 BY: SKYDECK LLC, ITS
MANAGER

 
			
		
	 By:
	 	/s/ Tim Parker

 
			
	Name:	 	Tim Parker

 
			
	Title:	 	Vice President

  

SIGNATURE PAGE TO AMENDED AND RESTATED
INVESTORS’ RIGHTS AGREEMENT 

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

			
	 INVESTOR:

	
	 RTV HOLDINGS LIMITED

		
	 By:
	 	/s/ Colm O’Connell
	Name:	 	Colm O’Connell
	Title:	 	Authorized Signatory

  

SIGNATURE PAGE TO AMENDED AND RESTATED
INVESTORS’ RIGHTS AGREEMENT 

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

			
		  	            INVESTOR:

  

			
	SKYDECK HOLDINGS III LLC
		
	BY:	 	SKYDECK LLC, ITS MANAGER
		
	By:	 	/s/ Tim Parker
	Name:	 	Tim Parker
	Title:	 	Vice President

  

SIGNATURE PAGE TO AMENDED AND RESTATED
INVESTORS’ RIGHTS AGREEMENT 

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

			
	 INVESTOR:

	
	 CITADEL MULTI-STRATEGY EQUITIES MASTER FUND LTD.

		
	By:	 	Citadel Advisors LLC, its Portfolio manager
		
	By:	 	/s/ Shellane Mulcahy
	Name:	 	Shellane Mulcahy
	Title:	 	 Authorized Signatory

 SIGNATURE PAGE TO AMENDED
AND RESTATED INVESTORS’ RIGHTS AGREEMENT 
  

 

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

			
	INVESTOR:
	
	TEKLA HEALTHCARE INVESTORS*
		
	By:	 	/s/ Daniel R. Omstead
	Name:	 	Daniel R. Omstead
	Title:	 	 President 

  

	*	 The name Tekla Healthcare Investors is the designation of the Trustees for the time being under an
Amended & Restated Declaration of Trust dated April 21, 1987, as amended, and all persons dealing with Tekla Healthcare Investors must look solely to the trust property for the enforcement of any claim against Tekla Healthcare
Investors, as neither the Trustees, officers nor shareholders assume any personal liability for the obligations entered into on behalf of Tekla Healthcare Investors. 

 

			
	 TEKLA LIFE SCIENCES INVESTORS*

		
	By:	 	/s/ Daniel R. Omstead
	Name:	 	Daniel R. Omstead
	Title:	 	 President 

  

	*	 The name Tekla Life Sciences Investors is the designation of the Trustees for the time being under a
Declaration of Trust dated February 20, 1992, as amended, and all persons dealing with Tekla Life Sciences Investors must look solely to the trust property for the enforcement of any claim against Tekla Life Sciences Investors, as neither the
Trustees, officers nor shareholders assume any personal liability for the obligations entered into on behalf of Tekla Life Sciences Investors. 

  

  

SIGNATURE PAGE TO AMENDED AND RESTATED
INVESTORS’ RIGHTS AGREEMENT 

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

			
	INVESTOR:
	
	ACUTA CAPITAL FUND, LP
	
	By: Acuta Capital Partners, LLC
	Its: General Partner

 
			
		
	By:	 	/s/ Scott R. Smith

 
			
	Name:	 	Scott R. Smith

 
			
	Title:	 	Chief Operating Officer

  

			
	ACUTA OPPORTUNITY FUND, LP
	
	By: Acuta Capital Partners, LLC
	Its: General Partner

 
			
		
	By:	 	/s/ Scott R. Smith

 
			
	Name:	 	Scott R. Smith

 
			
	Title:	 	Chief Operating Officer

  

SIGNATURE PAGE TO AMENDED AND RESTATED
INVESTORS’ RIGHTS AGREEMENT 

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

			
	INVESTOR:
	
	AGENT CAPITAL FUND I LP
	
	BY: AGENT CAPITAL FUND I GP, LLC
	ITS: GENERAL PARTNER

 
			
		
	 By:
	 	 /s/ Geeta
Vemuri

 
			
	 Name:
	 	 Geeta Vemuri

			
	 Title:
	 	 Managing Member

  

SIGNATURE PAGE TO AMENDED AND RESTATED
INVESTORS’ RIGHTS AGREEMENT 

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

			
	INVESTOR:
	
	ARIX BIOSCIENCE HOLDING LIMITED

 
			
		
	By:	 	/s/ Robert Lyne

 
			
	Name:	 	Robert Lyne

 
			
	Title:	 	Director

  

SIGNATURE PAGE TO AMENDED AND RESTATED
INVESTORS’ RIGHTS AGREEMENT 

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

			
	INVESTOR:
	
	BAYER HEALTHCARE LLC

 
			
		
	By:	 	/s/ Kelly Gast

 
			
	Name:	 	Kelly Gast

 
			
	Title:	 	President

  

SIGNATURE PAGE TO AMENDED AND RESTATED
INVESTORS’ RIGHTS AGREEMENT 

 SCHEDULE A 

INVESTORS 
 Name and Address

 Arix Bioscience Holdings Limited 
 20 Berkeley
Square 
 London W1J 6EQ 
 United Kingdom 

Email: *** 
 Pfizer Inc. 

235 E. 42nd Street 

New York, NY 10017 
 Email: *** with a copy to 

*** 
 Pfizer Ventures (US) LLC 

235 E. 42nd Street 

New York, NY 10017 
 Email: *** with a copy to 

*** 
 Legochem Biosciences, Inc. 

8-26 Munpyeongseo-ro Daedeok-gu 

Daejeon 34302, South Korea 
 Email: ***; *** 

RTW Master Fund, Ltd. 
 c/o RTW Investments, LP 

40 10th Avenue, Floor 7 
 New York, NY 10014 

Attention: Legal Department 
 Email: ***, ***, *** 

RTW Innovation Master Fund, Ltd. 
 c/o RTW Investments, LP

 40 10th Avenue, Floor 7 
 New York, NY 10014 

Attention: Legal Department 
 Email: ***, ***, *** 

RTW Venture Fund Limited 
 c/o RTW Investments, LP 

40 10th Avenue, Floor 7 
 New York, NY 10014 

Attention: Legal Department 
 Email: ***, ***, *** 

Perceptive Life Sciences Master Fund, Ltd. 
 51 Astor
Place, 10th Floor 
 New York, NY 10003 
 Email: *** 

RA Capital Healthcare Fund, L.P. 
 RA Capital Management,
L.P. 
 200 Berkeley Street 
 18th Floor 

Boston, MA 02116 
 Attn: General Counsel 

Email: *** 

 RA Capital Nexus Fund II, L.P. 

RA Capital Management, L.P. 
 200 Berkeley Street 

18th Floor 
 Boston, MA 02116 

Attn: General Counsel 
 Email: *** 

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

c/o Janus Capital Management LLC 
 151 Detroit Street 

Denver, CO 80206 
 Attn: *** 

Attn: *** 
 Email: ***; *** 

Janus Henderson Global Life Sciences Fund 
 c/o Janus
Capital Management LLC 
 151 Detroit Street 
 Denver, CO 80206

 Attn: *** 
 Attn: *** 

Email: ***; *** 
 Janus Henderson Biotech Innovation Master
Fund Limited 
 c/o Janus Capital Management LLC 
 151
Detroit Street 
 Denver, CO 80206 
 Attn: *** 

Attn: *** 
 Email: ***; *** 

Biotechnology Value Fund, L.P. 
 c/o BVF Partners L.P. 

44 Montgomery St. 
 40th Floor 

San Francisco CA 94104 
 Email: *** 

Biotechnology Value Fund II, L.P. 
 c/o BVF Partners L.P.

 44 Montgomery St. 
 40th Floor 

San Francisco CA 94104 
 Email: *** 

Biotechnology Value Trading Fund OS, L.P. 
 c/o BVF
Partners L.P. 
 44 Montgomery St. 
 40th Floor 

San Francisco CA 94104 
 Email: *** 

RTV Holdings Limited 
 89 Nexus Way, Camana Bay 

P.O. Box 31106 
 Grand Cayman
KY1-1205 
 Cayman Islands 

Emails: *** / *** 
 With a copy to (which shall not constitute
notice to): 
 C Suite 2202, 22nd Floor, 
 Two International
Finance Centre 
 8 Finance Street 
 Central, Hong Kong 

Attention: *** 
 Email: *** 

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

Goodwin Proctor (Hong Kong) LLP 
 38th Floor, Edinburgh Tower 

The Landmark 
 15 Queen’s Road Central, Hong Kong 

Attention: *** / *** 
 Email: *** / *** 

Cormorant Private Healthcare Fund III, LP 
 Neb Obradovic

 Cormorant Asset Management LP 
 200 Clarendon Street 52nd
Floor 
 Boston, MA 02116 
 Email: *** 

Cormorant Global Healthcare Master Fund, LP 
 Neb Obradovic

 Cormorant Asset Management LP 
 200 Clarendon Street 52nd
Floor 
 Boston, MA 02116 
 Email: *** 

CRMA SPV, L.P. 
 Neb Obradovic 

Cormorant Asset Management LP 
 200 Clarendon Street 52nd Floor

 Boston, MA 02116 
 Email: *** 

HBM Healthcare Investments (Cayman) Ltd. 
 Governors
Square, Suite #4-212-2 
 23 Lime Tree Bay Avenue 

PO Box 30852 
 Grand Cayman, KY1-1204, Cayman Islands 

Tel: *** 
 Fax: *** 

Email: *** 
 Tekla Healthcare Investors 

c/o Tekla Capital Management LLC 
 100 Federal Street, 19th Floor

 Boston, MA 02110 
 Attention: *** 

Telephone: *** 
 Facsimile: *** 

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

 Reitler Kailas & Rosenblatt LLC 
 4 Independence
Way, Suite 120 
 Princeton, NJ 08540 
 Attention: *** 

Facsimile: *** 
 Email: *** 

Tekla Life Sciences Investors 
 c/o Tekla Capital
Management LLC 
 100 Federal Street, 19th Floor 
 Boston, MA
02110 
 Attention: *** 
 Telephone: *** 

Facsimile: *** 
 Email: *** 

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

Reitler Kailas & Rosenblatt LLC 
 4 Independence Way,
Suite 120 
 Princeton, NJ 08540 
 Attention: *** 

Facsimile: *** 
 Email: *** 

Ridgeback Capital Investments LP 
 30 Star Island Drive

 Miami, FL, 33139 
 Acuta Capital Fund, LP 

*** 
 Chief Operating Officer 

1301 Shoreway Road, Suite 350 
 Belmont, CA 94002 

Telephone: *** 
 Email: *** 

Acuta Opportunity Fund, LP 
 *** 

Chief Operating Officer 
 1301 Shoreway Road, Suite 350 

Belmont, CA 94002 
 Telephone: *** 

Email: *** 
 Citadel Multi-Strategy Equities Master Fund Ltd.

 c/o Citadel Advisors LLC 
 601 Lexington Avenue 

New York, New York 10022 
 Attention: *** 

*** ; *** 
 *** ; *** 

With copies to: 
 Choate, Hall & Stewart, LLP 

Two International Place 
 Boston, MA 02100 

Attention: *** and *** 
 *** ; *** 

Laurion Capital Master Fund Ltd. 
 c/o Laurion Capital
Management LP 
 360 Madison Avenue, Suite 1900 
 New York, NY
10017 
 Attn: General Counsel 
 Email: *** 

Logos Opportunities Fund II, L.P. 
 1 Letterman Drive 

Building D, Suite D3-700 

San Francisco, CA 94129 
 LifeSci Venture Partners II, LP

 LifeSci Venture Management, LLC 
 Attn: ***, Managing
Member 
 250 West 55th Street, 34th Floor 
 New York, NY 10019

 Email: *** 
 John Flavin 

4820 Bryan Place 
 Downers Grove IL 60515 

Email: *** 

 Bayer HealthCare LLC 

100 Bayer Boulevard 
 Whippany, NJ 07981 

Attention: *** 
 E-mail:
***; 
 With a copy to: *** 
 E-mail: *** 
 Agent Capital Fund I LP 

1400 Main Street, Floor 1 
 Waltham, MA 02451 

Ipsen Farmaceutica BV 
 Taurusavenue 33 B, 2132 LS 

Hoofddorp, The Netherlands 
 Longwood Fund IV, L.P. 

c/o Longwood Fund 
 The Prudential Tower 

800 Boylston St., Suite 1555 
 Boston, MA 02199 

The University of Chicago 
 Office of Investments 

401 North Michigan Avenue, Suite 900 
 Chicago, IL 60661 

Skydeck Holdings II LLC 
 1 S. Wacker Dr., Suite 1810 

Chicago, IL 60606 
 Email: *** 

Skydeck Holdings III LLC 
 1 S. Wacker Dr., Suite 1810 

Chicago, IL 60606 
 Email: *** 

G&H Partners 
 1200 Seaport Blvd. 

Redwood City, CA 94063 
 Joe Mansueto 

c/o Mansueto Office 
 400 North Michigan Avenue, Suite 350 

Chicago, IL 60611 
 Maroon Partners LLC Defined Benefit Plan

 5 Revere Drive, Suite 350 
 Northbrook, IL 60062EX-10.4

 Exhibit 10.4 

PYXIS ONCOLOGY, INC. 

2019 STOCK PLAN 

ADOPTED on June 27, 2019 
  

 TABLE OF CONTENTS 

 

							
		  		  	 	Page	 
			
	 SECTION 1.
	  	 ESTABLISHMENT AND PURPOSE
	  	 	1	 
			
	 SECTION 2.
	  	 ADMINISTRATION
	  	 	1	 
	 (a)
	  	 Committees of the Board of Directors
	  	 	1	 
	 (b)
	  	 Authority of the Board of Directors
	  	 	1	 
			
	 SECTION 3.
	  	 ELIGIBILITY
	  	 	1	 
	 (a)
	  	 General Rule
	  	 	1	 
	 (b)
	  	 Ten-Percent Stockholders
	  	 	1	 
			
	 SECTION 4.
	  	 STOCK SUBJECT TO PLAN
	  	 	2	 
	 (a)
	  	 Basic Limitation
	  	 	2	 
	 (b)
	  	 Additional Shares
	  	 	2	 
			
	 SECTION 5.
	  	 TERMS AND CONDITIONS OF AWARDS OR SALES
	  	 	2	 
	 (a)
	  	 Stock Grant or Purchase Agreement
	  	 	2	 
	 (b)
	  	 Duration of Offers and Nontransferability of Rights
	  	 	2	 
	 (c)
	  	 Purchase Price
	  	 	2	 
			
	 SECTION 6.
	  	 TERMS AND CONDITIONS OF OPTIONS
	  	 	3	 
	 (a)
	  	 Stock Option Agreement
	  	 	3	 
	 (b)
	  	 Number of Shares
	  	 	3	 
	 (c)
	  	 Exercise Price
	  	 	3	 
	 (d)
	  	 Vesting and Exercisability
	  	 	3	 
	 (e)
	  	 Basic Term
	  	 	3	 
	 (f)
	  	 Termination of Service (Except by Death)
	  	 	4	 
	 (g)
	  	 Leaves of Absence
	  	 	4	 
	 (h)
	  	 Death of Optionee
	  	 	4	 
	 (i)
	  	 Restrictions on Transfer of Options
	  	 	5	 
	 (j)
	  	 No Rights as a Stockholder
	  	 	5	 
	 (k)
	  	 Modification, Extension and Assumption of Options
	  	 	5	 
	 (l)
	  	 Company’s Right to Cancel Certain Options
	  	 	5	 
			
	 SECTION 7.
	  	 TERMS AND CONDITIONS OF RESTRICTED STOCK UNITS
	  	 	6	 
	 (a)
	  	 Restricted Stock Unit Agreement
	  	 	6	 
	 (b)
	  	 Payment for Restricted Stock Units
	  	 	6	 
	 (c)
	  	 Vesting Conditions
	  	 	6	 
	 (d)
	  	 Forfeiture
	  	 	6	 
	 (e)
	  	 Voting and Dividend Rights
	  	 	6	 
	 (f)
	  	 Form and Time of Settlement of Restricted Stock Units
	  	 	6	 
	 (g)
	  	 Death of Recipient
	  	 	6	 
	 (h)
	  	 Creditors’ Rights
	  	 	6	 
	 (i)
	  	 Modification, Extension and Assumption of Restricted Stock Units
	  	 	7	 
	 (j)
	  	 Restrictions on Transfer of Restricted Stock Units
	  	 	7	 

  
 i 

							
			
	 SECTION 8.
	  	 PAYMENT FOR SHARES
	  	 	7	 
	 (a)
	  	 General Rule
	  	 	7	 
	 (b)
	  	 Services Rendered
	  	 	7	 
	 (c)
	  	 Promissory Note
	  	 	7	 
	 (d)
	  	 Surrender of Stock
	  	 	7	 
	 (e)
	  	 Cashless Exercise
	  	 	7	 
	 (f)
	  	 Net Exercise
	  	 	8	 
	 (g)
	  	 Other Forms of Payment
	  	 	8	 
			
	 SECTION 9.
	  	 ADJUSTMENT OF SHARES
	  	 	8	 
	 (a)
	  	 General
	  	 	8	 
	 (b)
	  	 Corporate Transactions
	  	 	9	 
	 (c)
	  	 Dissolution or Liquidation
	  	 	10	 
	 (d)
	  	 Reservation of Rights
	  	 	10	 
			
	 SECTION 10.
	  	 MISCELLANEOUS PROVISIONS
	  	 	10	 
	 (a)
	  	 Securities Law Requirements
	  	 	10	 
	 (b)
	  	 No Retention Rights
	  	 	10	 
	 (c)
	  	 Treatment as Compensation
	  	 	10	 
	 (d)
	  	 Governing Law
	  	 	10	 
	 (e)
	  	 Conditions and Restrictions on Shares
	  	 	11	 
	 (f)
	  	 Tax Matters
	  	 	11	 
			
	 SECTION 11.
	  	 DURATION AND AMENDMENTS; STOCKHOLDER APPROVAL
	  	 	12	 
	 (a)
	  	 Term of the Plan
	  	 	12	 
	 (b)
	  	 Right to Amend or Terminate the Plan
	  	 	12	 
	 (c)
	  	 Effect of Amendment or Termination
	  	 	12	 
	 (d)
	  	 Stockholder Approval
	  	 	12	 
			
	 SECTION 12.
	  	 DEFINITIONS
	  	 	12	 

  
 ii 

 PYXIS ONCOLOGY, INC. 2019
STOCK PLAN 
 SECTION 1. ESTABLISHMENT AND PURPOSE. 

The purpose of this Plan is to attract, incentivize and retain Employees, Outside Directors and Consultants through the grant of Awards. The
Plan provides for the direct award or sale of Shares, the grant of Options to purchase Shares and the grant of Restricted Stock Units to acquire Shares. Options granted under the Plan may be ISOs intended to qualify under Code Section 422 or
NSOs which are not intended to so qualify. 
 Capitalized terms are defined in Section 12. 

SECTION 2. ADMINISTRATION. 
 (a)
Committees of the Board of Directors. The Plan may be administered by one or more Committees. Each Committee shall consist, as required by
applicable law, of one or more members of the Board of Directors who have been appointed by the Board of Directors. Each Committee shall have such authority and be responsible for such functions as the Board of Directors has assigned to it. If no
Committee has been appointed, the entire Board of Directors shall administer the Plan. Any reference to the Board of Directors in the Plan or an Award Agreement shall be construed as a reference to the Committee (if any) to whom the Board of
Directors has assigned a particular function. 
 (b)
Authority of the Board of Directors. Subject to the provisions of the Plan, the Board of Directors shall have full authority and discretion to take
any actions it deems necessary or advisable for the administration of the Plan. Notwithstanding anything to the contrary in the Plan, with respect to the terms and conditions of awards granted to Participants outside the United States, the Board of
Directors may vary from the provisions of the Plan to the extent it determines it necessary and appropriate to do so; provided that it may not vary from those Plan terms requiring stockholder approval pursuant to Section 11(d) below. All
decisions, interpretations and other actions of the Board of Directors shall be final and binding on all Participants and all persons deriving their rights from a Participant. 

SECTION 3. ELIGIBILITY. 
 (a)
General Rule. Employees, Outside Director sand Consultants shall be eligible for the grant of Awards under the Plan. However, only Employees shall be eligible for the grant of ISOs. 

(b) Ten-Percent Stockholders. A person who owns more than 10% of the total combined voting power of all classes of
outstanding stock of the Company, its Parent or any of its Subsidiaries shall not be eligible for the grant of an ISO unless (i) the Exercise Price is at least 110% of the Fair Market Value of a Share on the Date of Grant and (ii) such ISO by
its terms is not exercisable after the expiration of five years from the Date of Grant. For purposes of this Subsection (b), in determining stock ownership, the attribution rules of Code Section 424(d) shall be applied. 

 SECTION 4. STOCK SUBJECT TO PLAN. 

(a) Basic Limitation. Not more than 25,707,947 Shares may be issued under the Plan, subject to Subsection (b) below and
Section 9 (a) . All of these Shares may be issued upon the exercise of ISOs. The Company, during the term of the Plan, shall at all times reserve and keep available sufficient Shares to satisfy the requirements of the Plan. Shares offered under
the Plan may be authorized but unissued Shares or treasury Shares. 
 (b) Additional Shares. In the event that
Shares previously issued under the Plan are forfeited to or repurchased by the Company due to failure to vest, such Shares shall be added to the number of Shares then available for issuance under the Plan. In the event that Shares that otherwise
would have been issuable under the Plan are withheld by the Company in payment of the Purchase Price, Exercise Price or withholding taxes, such Shares shall remain available for issuance under the Plan. In the event that an outstanding Option,
Restricted Stock Unit or other right for any reason expires or is canceled, the Shares allocable to the unexercised or unsettled portion of such Option, Restricted Stock Unit or other right shall remain available for issuance under the Plan. To the
extent an Award is settled in cash, the cash settlement shall not reduce the number of Shares remaining available for issuance under the Plan. Notwithstanding the foregoing, in the case of ISOs, this Subsection (b) shall be subject to any
limitations imposed under Section 422 of the Code and the treasury regulations thereunder. 
 SECTION 5. TERMS AND CONDITIONS OF AWARDS OR SALES.

 (a) Stock Grant or Purchase Agreement. Each award
of Shares under the Plan shall be evidenced by a Stock Grant Agreement between the Grantee and the Company. Each sale of Shares under the Plan (other than upon exercise of an Option) shall be evidenced by a Stock Purchase Agreement between the
Purchaser and the Company. Such award or sale shall be subject to all applicable terms and conditions of the Plan and may be subject to any other terms and conditions which are not inconsistent with the Plan and which the Board of Directors deems
appropriate for inclusion in a Stock Grant Agreement or Stock Purchase Agreement. The provisions of the various Stock Grant Agreements and Stock Purchase Agreements entered into under the Plan need not be identical. 

(b)
Duration of Offers and Nontransferability of Rights. Any right to purchase Shares under the Plan (other than an Option) shall
automatically expire if not exercised by the Purchaser within 30 days (or such other period as may be specified in the Award Agreement) after the grant of such right was communicated to the Purchaser by the Company. Such right is not transferable
and may be exercised only by the Purchaser to whom such right was granted. 
 (c) Purchase Price. The Board of
Directors shall determine the Purchase Price of Shares to be offered under the Plan at its sole discretion. The Purchase Price shall be payable in a form described in Section 8. 

  
 2 

 SECTION 6. TERMS AND CONDITIONS OF OPTIONS. 

(a) Stock Option Agreement. Each grant of an Option under the Plan shall be evidenced by a Stock
Option Agreement between the Optionee and the Company. The Option shall be subject to all applicable terms and conditions of the Plan and may be subject to any other terms and conditions that are not inconsistent with the Plan and that the Board of
Directors deems appropriate for inclusion in a Stock Option Agreement. The provisions of the various Stock Option Agreements entered into under the Plan need not be identical. 

(b) Number of Shares. Each Stock Option Agreement shall specify the number of Shares that are
subject to the Option and shall provide for the adjustment of such number in accordance with Section 9. The Stock Option Agreement shall also specify whether the Option is an ISO or an NSO. 

(c) Exercise Price. 

(i) General. Each Stock Option Agreement shall specify the Exercise Price, which shall be payable in a form described in
Section 8. Subject to the remaining provisions of this Subsection (c), the Exercise Price shall be determined by the Board of Directors in its sole discretion. 

(ii) ISOs. The Exercise Price of an ISO shall not be less than 100% of the Fair Market Value of a Share on the Date of
Grant, and a higher percentage may be required by Section 3(b) . This Subsection (c)(ii) shall not apply to an ISO granted pursuant to an assumption of, or substitution for, another incentive stock option in a manner that complies with
Code Section 424(a). 
 (iii) NSOs. Except as specifically set for thin this Subsection (c)(iii), the Exercise
Price of an NSO shall not be less than 100% of the Fair Market Value of a Share on the Date of Grant. This Subsection (c)(iii) shall not apply to an NSO granted to a person who is not a U.S. taxpayer on the Date of Grant or to an NSO that is
intended either to be exempt from Code Section 409A as a “short-termdeferral” or to comply with the requirements of Code Section 409A. In addition, this Subsection (c)(iii) shall not apply to an NSO granted pursuant to an
assumption of, or substitution for, another stock option in a manner that complies with Code Section 409A. 
 (d)
Vesting and Exercisability. Each Stock Option Agreement shall specify the date when all or any installment of the Option is to become vested and exercisable. No Option shall be exercisable unless the
Optionee (i) has delivered an executed copy of the Stock Option Agreement to the Company or (ii) otherwise agrees to be bound by the terms of the Stock Option Agreement. The Board of Directors shall determine the vesting and exercisability
provisions of the Stock Option Agreement at its sole discretion. 
 (e) Basic Term. The Stock Option Agreement
shall specify the term of the Option. The term shall not exceed 10 years from the Date of Grant, and in the case of an ISO, a shorter term may be required by Section 3(b). Subject to the preceding sentence, the Board of Directors at its sole
discretion shall determine when an Option is to expire. 

  
 3 

 (f)
Termination of Service (Except by Death). If an Optionee’s Service terminates for any reason other than the Optionee’s death, then the
Optionee’s Options shall expire on the earliest of the following dates: 
 (i) The expiration date determined pursuant
to Subsection (e) above; 
 (ii) The date three months after the termination of the optionee’s Service for any
reason other than Disability, or such earlier or later date as the Board of Directors may determine (but in no event earlier than 30 days after the termination of the optionee’s Service); or 

(iii) The date six months after the termination of the Optionee’s Service by reason of Disability, or such later date as
the Board of Directors may determine. 
 The Optionee may exercise all or part of the Optionee’s Options at any time before the expiration of such
Options under the preceding sentence, but only to the extent that such Options had become exercisable before the Optionee’s Service terminated (or became exercisable as a result of the termination) and the underlying Shares had vested before
the Optionee’s Service terminated (or vested as a result of the termination). In the event that the Optionee dies after the termination of the Optionee’s Service but before the expiration of the Optionee’s Options, all or part of such
Options may be exercised (prior to expiration) by the executors or administrators of the Optionee’s estate or by any person who has acquired such Options directly from the Optionee by beneficiary designation, bequest or inheritance, but only to
the extent that such Options had become exercisable be fore the Optionee’s Service terminated (or became exercisable as a result of the termination) and the underlying Shares had vested before the Optionee’s Service terminated (or vested
as a result of the termination). In no event will an Option, or the Shares underlying an Option, become vested and/or exercisable after termination of the Optionee’s Service unless the Board of Directors takes affirmative action or unless
expressly provided in a written agreement between the Company and the Optionee. 
 (g)
Leaves of Absence. For purposes of Subsection (f) above, Service shall be deemed to continue while the Optionee is on a bona fide leave of absence approved by the Company in writing. 

(h) Death of Optionee. If an Optionee dies while the Optionee is in Service, then the
Optionee’s Options shall expire on the earlier of the following dates: 
 (i) The expiration date determined pursuant
to Subsection (e) above; or 
 (ii) The date 12 months after the Optionee’s death, or such earlier or later date
as the Board of Directors may determine (but in no event earlier than six months after the Optionee’s death) . 

  
 4 

 All or part of the Optionee’s Options may be exercised at any time before the expiration of such
Options under the preceding sentence by the executors or administrators of the Optionee’s estate or by any person who has acquired such Options directly from the Optionee by beneficiary designation, bequest or inheritance, but only to the
extent that such Options had become exercisable before the Optionee’s death (or became exercisable as a result of the death) and the underlying Shares had vested before the Optionee’s death (or vested as a result of the Optionee’s
death). In no event will an Option, or the Shares underlying an Option, become vested and/or exercisable after the Optionee’s death unless the Board of Directors takes affirmative action or unless expressly provided in a written agreement
between the Company and the Optionee. 
 (i)
Restrictions on Transfer of Options. An Option shall be transferable by the Optionee only by (i) a beneficiary designation, (ii) a will or (iii) the
laws of descent and distribution, except as provided in the next sentence. If the Board of Directors so provides, in a Stock Option Agreement or otherwise, an NSO may be transferable to the extent permitted by Rule 701 under the Securities Act.
An ISO may be exercised during the lifetime of the Optionee only by the Optionee or by the Optionee’s guardian or legal representative. 

(j) No Rights as a Stockholder. An Optionee, or a
transferee of an Optionee, shall have no rights as a stockholder with respect to any Shares covered by the Optionee’s Option until such person submits a notice of exercise, pays the Exercise Price and satisfies all applicable withholding taxes
pursuant to the terms of such Option. 
 (k)
Modification, Extension and Assumption of Options. Within the limitations of the Plan, the Board of Directors may modify, reprice, extend or assume
outstanding Options or may accept the cancellation of outstanding options (whether granted by the Company or another issuer) in return for the grant of new Options or a different type of award for the same or a different number of Shares and at the
same or a different Exercise Price (if applicable) . The foregoing not withstanding, no modification of an Option shall, without the consent of the Optionee, impair the Optionee’s rights or increase the Optionee’s obligations under such
Option; provided, however, that a modification of an Option that is otherwise favorable to the Optionee (for example, providing the Optionee with additional time to exercise the Option after termination of employment or providing for additional
forms of payment) but causes the Option to lose its tax-favored status (for example, as an ISO) shall not require the consent of the Optionee. 

(l)
Company’s Right to Cancel Certain Options. Any other provision of the Plan or a Stock Option Agreement notwithstanding, the Company shall have
the right at any time to cancel an Option that was not granted in compliance with Rule 701 under the Securities Act. Prior to canceling such Option, the Company shall give the Optionee not less than 30 days’ notice in writing. If the
Company elects to cancel such Option, it shall deliver to the Optionee consideration with an aggregate value equal to the excess of (i) the Fair Market Value of the Shares subject to such Option as of the time of the cancellation over
(ii) the Exercise Price of such Option. The consideration may be delivered in the form of cash or cash equivalents, in the form of Shares, or a combination of both. If the consideration would be a negative amount, such Option may be cancelled
without the delivery of any consideration. 

  
 5 

 SECTION 7. TERMS AND CONDITIONS OF RESTRICTED STOCK UNITS 

(a) Restricted Stock Unit Agreement. Each grant of Restricted Stock Units under
the Plan shall be evidenced by a Restricted Stock Unit Agreement between the recipient and the Company. Such Restricted Stock Units shall be subject to all applicable terms and conditions of the Plan and may be subject to any other terms and
conditions that are not inconsistent with the Plan and which the Board of Directors deems appropriate for inclusion in a Restricted Stock Unit Agreement. The provisions of the various Restricted Stock Unit Agreements entered into under the Plan need
not be identical. 
 (b)
Payment for Restricted Stock Units. No cash consideration shall be required of the recipient in connection with the grant of Restricted Stock Units. 

(c) Vesting Conditions. Each Restricted Stock Unit Agreement shall specify the vesting requirements applicable to
the Restricted Stock Units subject thereto, which the Board of Directors shall determine in its sole discretion. 
 (d) Forfeiture.
Unless a Restricted Stock Unit Agreement provides otherwise, upon termination of the recipient’s Service and upon such other times specified in the Restricted Stock Unit Agreement, any unvested Restricted Stock Units shall be forfeited to the
Company. 
 (e) Voting and Dividend Rights. The holders of Restricted Stock
Units shall have no voting rights. Prior to settlement or forfeiture, any Restricted Stock Unit granted under the Plan may, at the discretion of the Board of Directors, carry with it a right to dividend equivalents. Such right entitles the holder to
be credited with an amount equal to all cash dividends paid on one Share while the Restricted Stock Unit is outstanding. Dividend equivalents may be converted into additional Restricted Stock Units. Settlement of dividend equivalents may be made in
the form of cash, in the form of Shares, or in a combination of both. Prior to distribution, any dividend equivalents that are not paid shall be subject to the same conditions and restrictions as the Restricted Stock Units to which they attach. 

(f)
Form and Time of Settlement of Restricted Stock Units. Settlement of vested Restricted
Stock Units may be made in the form of (i) cash, (ii) Shares or (iii) any combination of both, as determined by the Board of Directors. The actual number of Restricted Stock Units eligible for settlement may be larger or smaller than
the number included in the original award, based on predetermined performance factors. Vested Restricted Stock Units shall be settled in such manner and at such time(s) as specified in the Restricted Stock Unit Agreement. Until Restricted Stock
Units are settled, the number of Shares represented by such Restricted Stock Units shall be subject to adjustment pursuant to Section 9. 

(g) Death of Recipient. Any Restricted Stock Units that become distributable after the
Participant’s death shall be distributed to the Participant’s estate or to any person who has acquired such Restricted Stock Units directly from the recipient by beneficiary designation, bequest or inheritance. 

(h) Creditors’ Rights. A holder of Restricted Stock Units shall have no rights other than those of a general
creditor of the Company. Restricted Stock Units represent an unfunded and unsecured obligation of the Company, subject to the terms and conditions of the applicable Restricted Stock Unit Agreement. 

  
 6 

 (i)
Modification, Extension and Assumption of Restricted Stock Units. Within the limitations of the Plan, the
Board of Directors may modify, extend or assume outstanding restricted stock units (whether granted by the Company or a different issuer) . The foregoing notwithstanding, no modification of a Restricted Stock Unit shall, without the consent of the
Participant, impair the Participant’s rights or increase the Participant’s obligations under such Restricted Stock Unit. 
 (j)
Restrictions on Transfer of Restricted Stock Units. A Restricted Stock Unit shall be transferable by the Participant only by
(i) a beneficiary designation, (ii) a will or (iii) the laws of descent and distribution, except as provided in the next sentence. In addition, if the Board of Directors so provides, in a Restricted Stock Unit Agreement or otherwise,
a Restricted Stock Unit shall also be transferable to the extent permitted by Rule 701 under the Securities Act. 
 SECTION 8. PAYMENT FOR SHARES.

 (a) General Rule. The entire Purchase Price or Exercise Price of Shares issued under the Plan shall be
payable in cash or cash equivalents at the time when such Shares are purchased, except as otherwise provided in this Section 8. In addition, the Board of Directors in its sole discretion may also permit payment through any of the methods
described in (b) through (g) below. 
 (b) Services Rendered. Shares may be awarded under the Plan in
consideration of services rendered to the Company, a Parent or a Subsidiary prior to the award. 
 (c)
Promissory Note. All or a portion of the Purchase Price or Exercise Price (as the case may be) of Shares issued under the Plan may be paid with a promissory note. The Shares shall be pledged as security for payment of the
principal amount of the promissory note and interest thereon. The interest rate payable under the terms of the promissory note shall not be less than the minimum rate (if any) required to avoid the imputation of additional interest under the Code.
Subject to the foregoing, the Board of Directors in its sole discretion shall specify the term, interest rate, recourse, amortization requirements (if any) and other provisions of such note. 

(d) Surrender of Stock. All or any part of the Exercise Price may be paid by surrendering, or at
testing to the ownership of, Shares that are already owned by the Optionee. Such Shares shall be surrendered to the Company in good form for transfer and shall be valued at their Fair Market Value as of the date when the Option is exercised. 

(e) Cashless Exercise. All or part of the Exercise Price and any with holding taxes may be paid pursuant to a
cashless exercise arrangement (whether through a securities broker or otherwise) established by the Company where by Shares subject to an Option are sold and all or part of the sale proceeds are delivered to the Company. 

  
 7 

 (f) Net Exercise. An Option may permit exercise through a
“net exercise” arrangement pursuant to which the Company will reduce the number of Shares issued upon exercise by the largest whole number of Shares having an aggregate Fair Market Value (determined by the Board of Directors as of the
exercise date) that does not exceed the aggregate Exercise Price or the sum of the aggregate Exercise Price and any withholding taxes (with the Company accepting from the Optionee payment of cash or cash equivalents to satisfy any remaining balance
of the aggregate Exercise Price and, if applicable, any additional with holding taxes not satisfied through such reduction in Shares); provided that to the extent Shares subject to an Option are with held in this manner, the number of Shares
subject to the Option following the net exercise will be reduced by the sum of the number of Shares with held and the number of Shares delivered to the Optionee as a result of the exercise. 

(g) Other Forms of Payment. To the extent that an Award Agreement so provides,
the Purchase Price or Exercise Price of Shares issued under the Plan may be paid in any other form permitted by the Delaware General Corporation Law, as amended. 

SECTION 9. ADJUSTMENT OF SHARES. 
 (a)
General. In the event of a subdivision of the outstanding Stock, a declaration of a dividend payable in Shares, a combination or consolidation of the outstanding Stock into a lesser number of Shares, a reclassification, or any other increase
or decrease in the number of issued shares of Stock effected without receipt of consideration by the Company, proportionate adjustments shall automatically be made, as applicable, in each of (i) the number and kind of Shares available under
Section 4, (ii) the number and kind of Shares covered by each outstanding Option, Award of Restricted Stock Units and any outstanding and unexercised right to purchase Shares that has not yet expired pursuant to Section 5(b),
(iii) the Exercise Price under each outstanding Option and the Purchase Price applicable to any unexercised stock purchase right described in clause (ii) above, and (iv) any repurchase price that applies to Shares granted under the
Plan pursuant to the terms of a Company repurchase right under the applicable Award Agreement. In the event of a declaration of an extraordinary dividend payable in a form other than Shares in an amount that has a material effect on the Fair Market
Value of the Stock, a recapitalization, a spin-off, or a similar occurrence, the Board of Directors at its sole discretion may make appropriate adjustments in one or more of the items listed in clauses
(i) through (iv) above; provided, however, that the Board of Directors shall in any event make such adjustments as may be required by Section 25102(o) of the California Corporations Code to the extent the Company is relying on the
exemption afforded there under with respect to an Award. No fractional Shares shall be issued under the Plan as a result of an adjustment under this Section 9(a), al though the Board of Directors in its sole discretion may make a cash payment
in lieu of fractional Shares. 

  
 8 

 (b) Corporate Transactions. In the event that the Company
is a party to a merger or consolidation, or in the event of a sale of all or substantially all of the Company’s stock or assets, all Shares acquired under the Plan and all Awards outstanding on the effective date of the transaction shall be
treated in the manner described in the definitive transaction agreement (or, in the event the transaction does not entail a definitive agreement to which the Company is party, in the manner determined by the Board of Directors in its capacity as
administrator of the Plan, with such determination having final and binding effect on all parties), which agreement or determination need not treat all Awards (or all portions of an Award) in an identical manner. The treatment specified in the
transaction agreement or as determined by the Board of Directors may include (without limitation) one or more of the following with respect to each outstanding Award: 

(i) The Company, the surviving corporation or a parent there of may continue or assume the Award or substitute a comparable
award for the Award (including, but not limited to, an award to acquire the same consideration paid to the holders of Shares in the transaction). For avoidance of doubt, a comparable award need not be the same type of award as the Award for which it
is substituted, and, in the case of an Option, need not have the same tax-status (e.g., an NSO may be substituted for an ISO). 

(ii) The cancellation of the Award and a payment to the Participant with respect to each Share subject to the portion of the
Award that is vested as of the transaction date equal to the excess of (A) the value, as determined by the Board of Directors in its absolute discretion, of the property (including cash) received by the holder of a share of Stock as a result of
the transaction, over (if applicable) (B) the per-Share Exercise Price of the Award (such excess, the “Spread”). Such payment shall be made in the form of cash, cash equivalents, or securities
of the surviving corporation or its parent having a value equal to the Spread. In addition, any escrow, indemnification, holdback, earn-out or similar provisions in the transaction agreement may apply to such
payment to the same extent and in the same manner as such provisions apply to the holders of Stock. Receipt of the payment described in this Subsection (b)(ii) may be conditioned upon the Participant acknowledging such escrow, indemnification,
holdback, earn-out or other provisions on a form prescribed by the Company. If the Spread applicable to an Award is zero or a negative number, then the Award may be cancelled without making a payment to the Participant. 

(iii) Even if the Spread applicable to an Option is a positive number, the Option may be cancelled without the payment of any
consideration; provided that the Optionee shall be notified of such treatment and given an opportunity to exercise the Option (to the extent the Option is vested or becomes vested as of the effective date of the transaction) during a period of not
less than five (5) business days preceding the effective date of the transaction, unless (A) a shorter period is required to permit a timely closing of the transaction and (B) 

  
 9 

 such shorter period still offers the Optionee a reasonable opportunity to exercise the
Option. 
 (iv) In the case of an Option: (A) suspension of the Optionee’s right to exercise the Option during a limited
period of time preceding the closing of the transaction if such suspension is administratively necessary to facilitate the closing of the transaction and/or (B) termination of any right the Optionee has to exercise the Option prior tovesting in the
Shares subject to the Option (i.e.,“early exercise”),such that following the closing of the transaction the Option may only be exercised to the extent it is vested. 

For the avoidance of doubt, the Board of Directors has discretion to accelerate,in whole or part, the vesting and exercisability of an Award in connection
with a corporate transaction covered by this Section 9(b) . 
 (c)
Dissolution or Liquidation. To the extent not previously exercised or settled, Options, Restricted Stock Units and other rights to purchase Shares shall terminate immediately prior to the liquidation or
dissolution of the Company. 
 (d) Reservation of Rights. Except as provided in Section
7(e) or this Section 9, a Participant shall have no rights by reason of (i) any subdivision or consolidation of sharesof stock of any class, (ii) the payment of any dividend or (iii) any other increase or decrease in the number of shares of
stock of any class. Any issuance by the Company of shars of stock of any class, or securities convertible into shares of stock of any class, shall not affect, and no adjustmentby reason there of shall be made with respect to, the number or Exercise
Priceof Shares subject to an Award. The grant of an Award pursuant to the Plan shall not affectinany way the right or power of the Company to make adjustments,reclassifications,reorganizations or changes of its capital or business structure,to merge
or consolidate or to dissolve,liquidate,sell or transfer all or any part of its business or assets. 
 SECTION 10. MISCELLANEOUS PROVISIONS. 

(a) Securities Law Requirements. Shares shall not be issued under the Plan unless, in the
opinion of counsel acceptable to the Board of Directors, the issuance and delivery of such Shares complies with (or is exempt from) all applicable requirements of law, including (without limitation) the Securities Act, the rules and regulation
spromulgated the reunder,state securities laws and regulations, and the regulations of any stock exchange or other securities market on which the Company’s securities may then be traded. The Company shall not be liable for a failure to issue
Shares as a result of such requirements. Without limiting the foregoing, the Company may suspend the exercise of some or all outstanding Options for a period of up to 60 days in order to facilitate compliance with Securities Act Rule 701(e) . 

(b) No Retention Rights. Nothing in the Plan or in any right or A ward granted under the
Plan shall confer upon the Participant any right to continue in Service for any period of specific duration or interfere with or other wisere strictin any way the rights of the Company (or any Parent or Subsidiary employing or retaining the
Participant) or of the Participant, which rights are hereby expressly reserved by each, to terminate his or her Serviceat any time and for any reason, with or without cause. 

(c)Treatment as Compensation. Any compensation thatan individualearns or is deemed to earn
under this Plan shall not be considered a part of his or her compensation for purposes of calculating contributions, accruals or benefits under any other plan or program that is maintained or funded by the Company, a Parent or a Subsidiary. 

(d) Governing Law. The Plan and all awards, sales and grants under the Plan shall be governed by, and
construedin accordance with, the laws of the State of Delaware (exceptits choice-of-lawprovisions), as such laws are applied to contracts entered into and performed in
such State. 

  
 10 

 (e)
Conditions and Restrictions on Shares. Shares is sued under the Plan shall be subject to such forfeiture conditions, rights of repurchase, rights of first refusal, other
transfer restrictions and such other terms and conditions as the Board of Directors may determine. Such conditions and restrictions shall be set forth in the applicable Award Agreement and shall apply in addition to any restrictions at may apply to
holders of Shares generally. In addition, Shares issued under the Plan shall be subject to conditions and restrictions imposed either by applicable law or by Company policy, as adopted from time to time, designed to ensure compliance with applicable
law or laws with which the Company determines in its sole discretion to comply including in order to maintain any statutory, regulatory or tax advantage, which (for avoidance of doubt) need not be set forth in the applicable Award Agreement. 

(f) Tax Matters. 

(i) As a condition to the award, grant, issuance, vesting, purchase, exercise, settlement or transfer of any Award, or Shares
issued pursuant to any Award, granted under this Plan, the Participant shall make such arrangements as the Board of Directors may require or permit for the satisfaction of any federal, state, local or foreign with holding tax obligations that may
arise in connection with such event. 
 (ii) Unless otherwise expressly set forth in an Award Agreement, it in tended
that Awards shall be exempt from Code Section 409A, and any ambiguity in the terms of an Award Agreement and the Plan shall be interpreted consistently with this intent. To the extent an Award is not exempt from Code Section 409A (any such award, a
“409A Award ”), any ambiguity in the terms of such Award and the Plan shall be interpreted in a manner that to the maximum extent permissible supports the Award’s compliance with the requirements of that statute.
Notwithstanding anything to the contrary permitted under the Plan, in no event shall a modification of an Award not already subject to Code Section 409A, or any subsequent action taken with respect to such Award, be given effect if such modification
or action would cause the Award to become subject to Code Section 409A unless the parties explicitly acknowledge and consent to the modification or action as one having that effect. A 409A Award shall be subject to such additional rules and
requirements as specified by the Board of Directors from time to time in order for it to comply with the requirements of Code Section 409A. In this regard, if any amount under a 409A Award is payable upon a “separation from service” to an
individual who is considered a “specified employee” (as each term is defined under Code Section 409A), then no such payment shall be made prior to the date that is the earlier of (i) six months and one day after the Participant’s
separation from service or (ii) the Participant’s death, but only to the extent such delay is necessary to prevent such payment from being subject to Section 409A(a)(1). In addition, if a transaction subject to Section 9(b) constitutes a
payment event with respect to any 409A Award, then the transaction with respect to such award must also constitute a “change in control event” as defined in Treasury Regulation
Section 1.409A-3(i)(5) to the extent required by Code Section 409A. 

  
 11 

 (iii) Neither the Company nor any member of the Board of Directorsshallhave
any liabilityto a Participantin the event an Award held by the Participant fails to achieve its in tended characterization under applicabletax law. 

SECTION 11. DURATION AND AMENDMENTS; STOCKHOLDER APPROVAL. 

(a) Term of the Plan. The Plan, as setforthherein,shallbecome effective
on the date of it sadoptionby the Board of Directors,subject to approval of the Company’s stockholders under Subsection(d) below. The Plan shall terminate automatically10 yearsafter the later of (i) the date when the Board of Directors adopted
the Plan or (ii) the date when the Board of Directors approved the most recentincreasein the number of Shares reserved under Section 4 that was also approved by the Company’s stockholders. The Plan may be terminatedon any earlier date
pursuant to Subsection (b) below. 
 (b)
Right to Amend or Terminate the Plan. Subjectto Subsection(d) below, the Board of Directors may amend, suspend or terminate the
Plan at any time and for any reason. 
 (c)
Effect of Amendment or Termination. No Sharesshallbe issuedor soldand no Award grantedunder thePlan after the termination there of,except upon exercise or settlement of
an Award granted under the Plan priorto such termination. Except as expressly provided in Section6(k) above, the terminationof the Plan, or any amendment thereof,shall not affect any Share previously issued or any Award previously granted under the
Plan. 
 (d) Stockholder Approval. To the extentrequired by applicable law, the Plan will be subject
to approval of the Company’s stockholders within12 months of its adoptiondate. An amendment of the Plan will be subject to the approval of the Company’s stock holders only to the extent required by applicable laws, regulations or rules.

 SECTION 12. DEFINITIONS. 
 (a)
“Award ” means any award granted under the Plan, including as an Option, an award of Restricted Stock Units or the grant or sale of Shares pursuant to Section 5 of the Plan. 

(b) “Award Agreement” means a Restricted Stock Unit Agreement, Stock Grant Agreement, Stock Option Agreement or Stock
Purchase Agreement or such other agreement evidencing an Award under the Plan. 
 (c) “Board of Directors” means the Board
of Directors of the Company, as constituted from time to time. 
 (d) “Code” means the Internal Revenue Code of 1986, as
amended. 
 (e) “Committee” means a committee of the Board of Directors, as described in Section 2(a). 

  
 12 

 (f) “Company” means Pyxis Oncology, Inc., a Delaware corporation. 

(g) “Consultant” means a person, excluding Employees and Outside Directors, who performs bona fide services for the Company,
a Parent or a Subsidiary as a consultant or advisor and who qualifies as a consultant or advisor under Rule 701(c)(1) of the Securities Act or under Instruction A.1.(a)(1) of Form S-8 under the
Securities Act. 
 (h) “Date of Grant” means the date of grant specified in the Award Agreement, which date shall be
the later of (i) the date on which the Board of Directors resolved to grant the Award or (ii) the first day of the Participant’s Service. 

(i) “Disability” means that the Optionee is unable to engage in any substantial gainful activity by reason of any medically
determinable physical or mental impairment. 
 (j) “Employee” means any individual who is a
common-law employee of the Company, a Parent or a Subsidiary. 
 (k) “Exchange Act”
means the Securities Exchange Act of 1934, as amended. 
 (l) “Exercise Price” means the amount for which one Share
may be purchased upon exercise of an Option, as specified by the Board of Directors in the applicable Stock Option Agreement. 
 (m)
“Fair Market Value” means the fair market value of a Share, as determined by the Board of Directors in good faith. Such determination shall be conclusive and binding on all persons. 

(n) “Grantee” means a person to whom the Board of Directors has awarded Shares under the Plan. 

  
 13 

 (o) “ISO” means an Option that qualifies as an incentive stock option as
described in Code Section 422(b). Notwithstanding its designation as an ISO, an Option that does not qualify as an ISO under applicable law shall be treated for all purposes as an NSO. 

(p) “NSO” means an Option that does not qualify as an incentive stock option as described in Code Section 422(b) or
423(b). 
 (q) “Option” means an ISO or NSO granted under the Plan and entitling the holder to purchase Shares. 

(r) “Optionee” means a person who holds an Option. 

(s) “Outside Director” means a member of the Board of Directors who is not an Employee. 

(t) “Parent” means any corporation (other than the Company) in an unbroken chain of corporation sending with the Company, if
each of the corporations other than the Company owns stock possessing 50% or more of the total combined voting power of all classes of stock in one of the other corporations in such chain. A corporation that attains the status of a Parent on a date
after the adoption of the Plan shall be considered a Parent commencing as of such date. 
 (u) “Participant” means the
holder of an outstanding Award. 
 (v) “Plan” means this Pyxis Oncology, Inc. 2019 Stock Plan. 

(w) “Purchase Price” means the consideration for which one Share may be acquired under the Plan (other than upon
exercise of an Option), as specified by the Board of Directors. 
 (x) “Purchaser” means a person to whom the Board of
Directors has offered the right to purchase Shares under the Plan (other than upon exercise of an Option) . 
 (y) “Restricted Stock
Unit” means a bookkeeping entry representing the equivalent of one Share, as awarded under the Plan. 
 (z) “Restricted
Stock Unit Agreement” means the agreement between the Company and the recipient of a Restricted Stock Unit that contains the terms, conditions and restrictions pertaining to such Restricted Stock Unit. 

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

(bb) “Service” means service as an Employee, Outside Director or Consultant. In case of any dispute as to whether and when
Service has terminated, the Board of Directors shall have sole discretion to determine whether such termination has occurred and the effective date of such termination. 

  
 14 

 (cc) “Share” means one share of Stock, as adjusted in accordance with
Section 9 (if applicable). 
 (dd) “Stock” means the Common Stock of the Company. 

(ee) “Stock Grant Agreement” means the agreement between the Company and a Grantee who is awarded Shares under the
Plan that contains the terms, conditions and restrictions pertaining to the award of such Shares. 
 (ff) “Stock Option
Agreement” means the agreement between the Company and an Optionee that contains the terms, conditions and restrictions pertaining to the Optionee’s Option. 

(gg) “Stock Purchase Agreement” means the agreement between the Company and a Purchaser who purchases Shares under the
Plan that contains the terms, conditions and restrictions pertaining to the purchase of such Shares. 
 (hh)
“Subsidiary” means any corporation (other than the Company) in an unbroken chain of corporations beginning with the Company, if each of the corporations other than the last corporation in the unbroken chain owns stock possessing 50%
or more of the total combined voting power of all classes of stock in one of the other corporations in such chain. A corporation that attains the status of a Subsidiary on a date after the adoption of the Plan shall be considered a Subsidiary
commencing as of such date. 

  
 15 

 EXHIBIT A 

SCHEDULE OF SHARES RESERVED FOR ISSUANCE
UNDER THE PLAN 
  

							
	 Date of Board

Approval
	  	 Date of Stockholder

Approval
	  	 Number of

Shares Added
	  	Cumulative Number
of Shares
	June 27, 2019	  	June 27, 2019	  	Not Applicable	  	4,777,358
	March 5, 2021	  	March 5, 2021	  	20,930,589	  	25,707,947

  
 E-1

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