Document:

EX-10.1

 Exhibit 10.1 

ZENTALIS PHARMACEUTICALS, LLC 

2017 PROFITS INTEREST PLAN 

Zentalis Pharmaceuticals, LLC, a Delaware limited liability company (including any successor entity thereto which assumes the Plan, the
“Company”), has adopted this Zentalis Pharmaceuticals, LLC 2017 Profits Interest Plan (as amended, modified or supplemented from time to time, the “Plan”), effective December 21, 2017 (the “Effective
Date”), for the benefit of the eligible Directors, Employees and Consultants of the Company and its Affiliates (each such term as defined below). The purpose of the Plan is to provide such eligible Directors, Employees and Consultants with
an opportunity to participate in the Company’s future success by granting them Awards so as to enhance the ability of the Company and its Affiliates to attract and retain individuals of exceptional talent to contribute to the sustained
progress, growth and profitability of the Company and its Affiliates.    This Plan is the “Class B Common Unit Plan” referenced in the LLC Agreement (as defined below). 

Pursuant to the Plan, eligible Directors, Employees and Consultants may be granted Awards of Class B Common Units (as defined below) and
thereby become Members of the Company (to the extent not already Members). The Class B Common Units so issued shall be governed by, and will be subject to, the transfer restrictions and other provisions contained in the Plan, a Profits Interest
Award Agreement to be executed by and between the Company and each such Participant, and the LLC Agreement. 
 ARTICLE I. 

DEFINITIONS 
 Whenever the
following terms are used in the Plan, they shall have the meanings specified below unless the context clearly indicates to the contrary. Any other capitalized terms used in the Plan but not otherwise defined herein shall have their respective
meanings set forth in the LLC Agreement. The masculine pronoun shall include the feminine and neuter and the singular shall include the plural, where the context so indicates. 

1.1.    Administrator. “Administrator” shall have the meaning set forth in
Section 5.1 hereof. 
 1.2.    Affiliate. “Affiliate” shall have the
meaning given to such term in the LLC Agreement. 
 1.3.    Award. “Award” shall mean an
issuance of Class B Common Units under the terms and conditions of the Plan and the applicable Profits Interest Award Agreement. 

1.4.    Board. “Board” shall mean the Board of Directors of the Company. 

1.5.    C-Corporation.
“C-Corporation” shall mean a corporation under subchapter C of the Code. 

1.6.    Capital Contribution. “Capital Contribution” shall have the meaning ascribed to such term
in the LLC Agreement. 

 1.7.    Cause. “Cause,” with respect to any
Participant, shall mean “Cause” as defined in such Participant’s Profits Interest Award Agreement or employment agreement with the Company or an Affiliate, if such an agreement exists and contains a definition of Cause, or, if no such
agreement exists or such agreement does not contain a definition of Cause, then Cause means: (a) the Participant’s unauthorized use or disclosure of confidential information or trade secrets of the Company or its Affiliates or any other
breach of a written agreement between the Participant and the Company or any of its Affiliates, including without limitation a breach of any employment, confidentiality or restrictive covenant agreement; (b) the Participant’s commission of
a felony or commission of any other crime involving dishonesty or moral turpitude under the applicable law; (c) the Participant’s gross negligence or willful misconduct or the Participant’s willful or repeated failure or refusal to
substantially perform his or her assigned duties; (d) any act of fraud, embezzlement, misappropriation or dishonesty committed by the Participant against the Company or any of its Affiliates; or (e) any acts, omissions or statements by a
Participant which the Company reasonably determines to be detrimental or damaging to the reputation, operations, prospects or business relations of the Company or any of its Affiliates. 

1.8.     Change in Control. “Change in Control” means (a) a Deemed Liquidation Event, or
(b) a Company Unit Sale; provided that the following events shall not constitute a “Change in Control”: (i) an initial public offering of any of the Company’s Securities; (ii) a reincorporation of the Company solely to
change its jurisdiction; or (iii) a transaction undertaken for the primary purpose of creating a holding company that will be owned in substantially the same proportion by the persons who held the Company’s Securities immediately before
such transaction. 
 1.9.    Class A Common Unit. “Class A Common Unit” shall
mean have the meaning ascribed to such term in the LLC Agreement. 
 1.10.    Class B Common Unit.
“Class B Common Unit” shall mean have the meaning ascribed to such term in the LLC Agreement. 

1.11.    Code. “Code” shall mean the Internal Revenue Code of 1986, as amended. Any reference
to any specific provision of the Code shall be deemed to refer also to any successor provisions thereto. 

1.12.    Company. “Company” shall mean Zentalis Pharmaceuticals, LLC, a Delaware limited liability
company, and any successor entity thereto which assumes the Plan. 
 1.13.    Company Unit Sale. “Company
Unit Sale” shall have the meaning ascribed to such term in the LLC Agreement. 
 1.14.    Consultant.
“Consultant” shall mean any consultant or advisor if: (a) the consultant or advisor renders bona fide services to the Company or any Affiliate; (b) the services rendered by the consultant or advisor are not in connection
with the offer or sale of Securities in a capital-raising transaction and do not directly or indirectly promote or maintain a market for the Company’s Securities; and (c) the consultant or advisor is a natural Person who has contracted
directly with the Company or any Affiliate to render such services. 

  
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 1.15.    Deemed Liquidation Event. “Deemed Liquidation
Event” shall have the meaning ascribed to such term in the LLC Agreement. 
 1.16.    Director.
“Director” shall have the meaning ascribed to such term in the LLC Agreement. 

1.17.    Employee. “Employee” shall mean any officer or other employee of the Company or any
Affiliate. A Participant shall not cease to be an Employee in the case of transfers between locations of the Company and its Affiliates or between the Company, any Affiliate or any successor. 

1.18.    Equity Restructuring. “Equity Restructuring” shall mean a
non-reciprocal transaction between the Company and its equity holders, including, without limitation, any equity dividend, equity split, spin-off, rights offering,
recapitalization or large, nonrecurring cash dividend or distribution, that (i) affects the Securities of the Company or the unit price of the Company’s Securities and (ii) causes a change in the per unit value of the Class B
Common Units underlying outstanding Awards. 
 1.19.    Exchange Act. “Exchange Act” shall mean
the Securities Exchange Act of 1934, as amended, and the rules and regulations thereunder as in effect from time to time. 

1.20.    Fair Market Value. “Fair Market Value” shall mean, as of any given date, the value of a
Class B Common Unit as determined by the Administrator in good faith based on the amount that such Participant would be entitled to receive in respect of such Class B Common Unit under the LLC Agreement in the event of a hypothetical
complete liquidation of the Company as of such date. 
 1.21.    Good Reason. “Good Reason”
shall mean “Good Reason” as defined in such Participant’s Profits Interest Award Agreement or employment agreement with the Company or an Affiliate, if such an agreement exists and contains a definition of Good Reason, or, if no such
agreement exists or such agreement does not contain a definition of Good Reason, then Good Reason means (a) a change in the Participant’s position with the Company (or its subsidiary employing the Participant) that materially reduces the
Participant’s authority, duties or responsibilities, (b) a material diminution in the Participant’s level of base compensation, except in connection with a general reduction in the base compensation of the Company’s personnel
with similar status and responsibilities or (c) a relocation of the Participant’s place of employment by more than 50 miles, provided that such change, reduction or relocation is effected by the Company (or its subsidiary employing the
Participant) without the Participant’s consent. Notwithstanding the foregoing, Good Reason shall only exist if Participant shall have provided the Company with written notice within sixty (60) days of the initial occurrence of any of the
foregoing events or conditions, and the Company or any successor or affiliate fails to eliminate the conditions constituting Good Reason within thirty (30) days after receipt of written notice of such event or condition from Participant.
Participant’s resignation from employment with the Company for “Good Reason” must occur within six (6) months following the initial occurrence of one of the foregoing events or conditions. Notwithstanding the foregoing, if
Participant is a party to a written employment or consulting agreement with the Company (or its subsidiary) in which the term “good reason” is defined, then “Good Reason” shall be as such term is defined in the applicable written
employment or consulting agreement. 

  
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 1.22.    LLC Agreement. “LLC Agreement” shall
mean the Amended and Restated Limited Liability Company Agreement of Zentalis Pharmaceuticals, LLC dated as of December 21, 2017, by and among the Members named therein, as amended and/or restated from time to time. 

1.23.    Member. “Member” shall have the meaning ascribed to such term in the LLC Agreement. 

1.24.    Participant. “Participant” shall mean any Director, Employee or Consultant who is
selected by the Administrator to receive an Award pursuant to the provisions of Section 3.1 hereof, who executes a Profits Interest Award Agreement pursuant to the provisions of Section 3.2 hereof,
and who joins the LLC Agreement as a Member thereunder. 
 1.25.    Person. “Person” shall mean
any individual, partnership, limited partnership, limited liability company, joint venture, trust, corporation, unincorporated organization, association, estate or other entity. 

1.26.    Plan. “Plan” shall mean this Zentalis Pharmaceuticals, LLC 2017 Profits Interest Plan, as
amended, modified or supplemented from time to time. 
 1.27.    Profits Interest Award Agreement.
“Profits Interest Award Agreement” shall mean the Profits Interest Award Agreement pursuant to which Class B Common Units shall be issued to a Participant under the Plan. 

1.28.    Rule 16b-3. “Rule
16b-3” shall mean that certain Rule 16b-3 under the Exchange Act, as such rule may be amended from time to time. 

1.29.     Securities. “Securities” shall mean, as to any Person (a) shares of capital stock,
membership or partnership interests, units or other equity interests in such Person, (b) obligations, evidences of indebtedness or other securities or interests convertible or exchangeable into capital stock, membership or partnership
interests, units or other equity interests in such Person and (c) subscriptions, calls, warrants, options or commitments of any kind or character relating to, or entitling any Person to purchase or otherwise acquire, any capital stock,
membership or partnership interests, units or other equity interests in such Person. 
 1.30.    Securities Act.
“Securities Act” shall mean the Securities Act of 1933, as amended. 
 1.31.    Termination of
Service. “Termination of Service” shall mean: 
 (a)    As to a Consultant, termination for any
reason, including death, disability, resignation, retirement or termination with or without Cause, at any time, of a Participant’s engagement as a Consultant to the Company or any Affiliate, but excluding any termination where the Participant
simultaneously commences or remains in employment or service with the Company or any Affiliate. 

  
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 (b)    As to a Director, termination for any reason, including, without
limitation, a termination by resignation, removal with or without Cause, failure to be elected, death or retirement, of a Participant’s service as a Director, but excluding any termination where the Participant simultaneously commences or
remains in employment or service with the Company or any Affiliate. 
 (c)    As to an Employee, termination for any
reason, including death, disability, resignation, retirement or termination with or without Cause, at any time, of a Participant’s employment with the Company or any Affiliate, but excluding any termination which includes simultaneous
reemployment or continuous employment of the Participant by the Company or any Affiliate. 
 The Administrator, in its absolute discretion,
shall determine the effect of all matters and questions relating to Terminations of Service, including, without limitation, the question of whether a Termination of Service has occurred, whether any Termination of Service resulted from a discharge
for Cause and all questions of whether particular leaves of absence constitute a Termination of Service. For purposes of the Plan, a Participant’s employee-employer relationship or consultancy relationship shall be deemed to be terminated in
the event that the Affiliate employing or contracting with such Participant ceases to remain an Affiliate of the Company following any merger, sale of stock or other corporate transaction or event (including, without limitation, a spin-off). 
 1.32.    Transfer. “Transfer” shall have the
meaning ascribed to such term in the LLC Agreement. 
 ARTICLE II. 

UNITS SUBJECT TO PLAN 

2.1.    Amount of Awards Subject to Plan. The Awards that may be granted under the Plan shall be Class B
Common Units. Subject to the provisions of Section 6.3 hereof, the maximum aggregate number of Class B Common Units which may be issued hereunder shall be equal to the authorized number of Class B Common Units
pursuant to Section 4.1(a)(iv) under the LLC Agreement from time to time. Such Awards may consist, in whole or in part, of authorized but unissued Class B Common Units, Class B Common Units acquired or reacquired in private
transactions or open market purchases, or Class B Common Units otherwise issuable by the Company, or any combination of the foregoing, as determined by the Administrator in its discretion. 

2.2.    Add-back. To the extent that any Award is forfeited by a
Participant, the Class B Common Units subject to such Award that are forfeited shall thereafter be available for the grant of Awards under the Plan. 

  
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 ARTICLE III. 

AWARDS 

3.1.    Awards. 

(a)    The Administrator may from time to time, in its sole and absolute discretion: 

(i)    Select those Directors, Employees or Consultants who will receive Awards; 

(ii)    Determine the purchase price, if any, of the Class B Common Units subject to any Award, and
the form of payment of any such purchase price for the Class B Common Units subject to any Award; 

(iii)    Determine the Threshold Value, vesting terms and conditions of the Class B Common Units, and
the other terms and conditions applicable to any such Award, including provisions for forfeiture and repurchase, consistent with the Plan and with the LLC Agreement; and 

(iv)    Accelerate the vesting of any Award granted hereunder 

(b)    Upon the selection of a Director, Employee or Consultant to receive an Award, the Administrator shall grant such
Award and may impose such terms and conditions on the issuance of such Award as the Administrator deems appropriate; provided, however, that no such terms and conditions may be inconsistent with the terms and conditions of the Plan or the LLC
Agreement, which are hereby incorporated herein by this reference. 
 3.2.    Profits Interest Award Agreement.
An Award shall be issued only pursuant to an Profits Interest Award Agreement, which shall be executed by the selected Director, Employee or Consultant and an authorized representative of the Company and which shall contain such terms and conditions
as the Administrator shall determine, consistent with the Plan and the LLC Agreement. Upon receipt of an Award, a Participant shall, automatically and without further action on his or her part, be deemed to be a party to, signatory of and bound by
the LLC Agreement as a Member. At the Company’s request, such Participant shall execute the LLC Agreement or a joinder or counterpart signature page thereto. All Awards granted under the Plan shall be subject to the terms and conditions of the
LLC Agreement and shall be subject to such additional restrictions as the Administrator shall provide (in the applicable Profits Interest Award Agreement or otherwise), which restrictions may include, without limitation, restrictions concerning
voting rights and transferability and restrictions based on the duration of the Participant’s employment or other service relationship with the Company or any Affiliate, the performance of the Participant, or the performance of the Company or
any Affiliate; provided, however, that, by action taken in its absolute discretion after the Award is granted, the Administrator may, in its sole discretion, on such terms and conditions as it may determine to be appropriate, remove any or
all of the restrictions imposed by the terms of the applicable Profits Interest Award Agreement. 

  
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 3.3.    Eligibility. An Award of Class B Common Units may
only be granted to a Participant for the performance of services to or for the benefit of the Company or any Affiliate: (i) in the Participant’s capacity as a Member, (ii) in anticipation of the Participant becoming a Member, or
(iii) as otherwise determined by the Administrator, consistent with the treatment of the Class B Common Units as “profits interests” within the meaning of the Code and Rev. Proc. 93-27, 1993-2 C.B. 343 and Rev. Proc. 2001-43, 2001-2 C.B. 191. 

3.4.    Rights as Members. Upon the grant of an Award pursuant to the Plan, the Participant shall have, unless
otherwise provided by the Administrator, all the rights and obligations of a Member with respect to said Awards as provided in the Plan and the LLC Agreement, subject to the restrictions in his or her Profits Interest Award Agreement and the LLC
Agreement. As set forth in the LLC Agreement, the Participant shall not, by virtue of holding an Award, have the right to influence or control the management or operation of the Company. 

3.5.    Escrow. The Administrator or such other escrow holder as the Administrator may appoint shall retain
physical custody of each certificate, if any, representing any Class B Common Units issued under an Award until all of the restrictions, if any, imposed under the Profits Interest Award Agreement with respect to the Award evidenced by such
certificate expire or shall have been removed by the Administrator. 
 ARTICLE IV. 

RESTRICTIONS ON AWARDS 

4.1.    Forfeiture of Awards. Unless otherwise determined by the Administrator, upon any Termination of Service of
a Participant, such Participant’s Award and all Class B Common Units subject thereto, to the extent not vested as of the date of such Termination of Service (after taking into account any accelerated vesting that may occur in connection
with such Termination of Service, if any) (and the proportionate amount of the balance of Participant’s Capital Account (as defined in the LLC Agreement) attributable to such Class B Common Units), shall thereupon automatically and without
further action be cancelled and forfeited by the Participant, and the Participant shall have no further right, title or interest in or with respect to such unvested Class B Common Units (or such proportionate amount of Participant’s
Capital Account balance). 
 4.2.    Restrictions on Class B Common Units. In addition to any
applicable transfer restrictions, repurchase rights and other restrictions set forth in the LLC Agreement with respect to the Class B Common Units, the Class B Common Units shall be subject to such restrictions as the Administrator shall
determine in its sole discretion, including, without limitation, transfer restrictions, repurchase rights, requirements that Class B Common Units be transferred in the event of certain transactions, rights of first refusal with respect to
permitted transfers of Class B Common Units, voting agreements, tag-along rights and drag-along rights. Such restrictions may, in the Administrator’s sole discretion, be contained in the applicable
Profits Interest Award Agreement or in such other agreement as the Administrator shall determine, in each case in a form determined by the Administrator in its sole discretion. The issuance of the Class B Common Units shall be conditioned on
the Participant’s consent to such restrictions or the Participant’s entering into such agreement or agreements. 

  
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 4.3.    Legend. In order to enforce the restrictions imposed upon
the Class B Common Units issued pursuant to Awards granted hereunder, the Administrator may cause a legend or legends to be placed on certificates, if any, representing the Class B Common Units that are subject to restrictions under the
Profits Interest Award Agreements, which legend or legends shall make appropriate reference to the conditions imposed thereby. 
 ARTICLE
V. 
 ADMINISTRATION 

5.1.    Administrator. The Plan shall be administered by the Board or such other individual(s) as may be appointed
or designated by the Board from time to time (in such capacity, the “Administrator”).    To the extent permitted by applicable law, the Board may from time to time delegate to a committee of one or more members
of the Board or one or more officers of Company the authority to grant or amend Awards; provided, however, that in no event shall an officer of the Company be delegated the authority to grant Awards to, or amend Awards held by, the following
individuals: (a) individuals who are subject to Section 16 of the Exchange Act with respect to the Company, or (b) officers (or Directors) of the Company to whom authority to grant or amend Awards is authorized or has been delegated
hereunder. Any delegation hereunder shall be subject to the restrictions and limits that the Board specifies at the time of such delegation, and the Board may at any time rescind the authority so delegated or appoint a new delegatee. At all times,
any delegatee appointed under this Section 5.1 shall serve in such capacity at the pleasure of the Board.  

5.2.    Duties and Powers of Administrator. It shall be the duty of the Administrator to conduct the general
administration of the Plan in accordance with its provisions. The Administrator shall have the discretionary power and authority to interpret the Plan and the Profits Interest Award Agreements pursuant to which Awards are issued, and to adopt such
rules for the administration, interpretation, and application of the Plan as are consistent therewith and to interpret, amend or revoke any such rules. Any Award under the Plan need not be the same with respect to each Participant. The Administrator
may correct any defect or supply any omission or reconcile any inconsistency in the Plan or a Profits Interest Award Agreement in such manner and to such extent as the Administrator deems necessary or appropriate. Unless otherwise expressly provided
in the Plan, all designations, determinations, interpretations and other decisions under or with respect to the Plan or any Award shall be within the sole discretion of the Administrator, may be made at any time and shall be final, conclusive and
binding upon all Persons, including the Company, any Affiliate, any Participant and any beneficiary of any Participant. 

5.3.    Majority Rule; Unanimous Written Consent. Except as otherwise provided in the LLC Agreement, the
Administrator shall act by the affirmative vote of a majority of its members in attendance at a meeting at which a quorum is present and voting or by a unanimous written consent or other written instrument signed by all members of the Administrator.

 5.4.    Professional Assistance; Good Faith Actions; Compensation. All expenses and liabilities which members
of the Administrator incur in connection with the administration of the Plan shall be borne by the Company. The Administrator may employ attorneys, consultants, accountants, appraisers, brokers, or other Persons in connection with the administration
of the 

  
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Plan. The Administrator, the Company and the Company’s officers shall be entitled to rely upon the advice, opinions or valuations of any such Persons. All actions taken and all
interpretations and determinations made by the Administrator in good faith shall be final and binding upon all Participants, the Company and all other interested Persons. No members of the Administrator shall be personally liable for any action,
determination or interpretation made in good faith with respect to the Plan, including grant of Awards, and all members of the Administrator shall be fully protected by the Company in respect of any such action, determination or interpretation. The
members of the Administrator shall serve without compensation for their services as representatives of the Administrator. 

5.5.    Financial Statements and Business Information. To the extent required by applicable securities laws and
subject to any limitations contained in the LLC Agreement, each Participant shall receive financial statements and other information relating to the Company, subject to applicable confidentiality obligations, as determined by the Administrator. 

ARTICLE VI. 

MISCELLANEOUS PROVISIONS 

6.1.    Restrictions on Transfer of Class B Common Units. The Class B Common Units issued
to a Participant under an Award shall be subject to the terms of the Profits Interest Award Agreement pursuant to which such Award was issued and the applicable provisions of the Plan and the LLC Agreement, including, without limitation, any
restrictions on Transfer of Class B Common Units set forth in the LLC Agreement. Any transferee of a permitted Transfer, in accordance with the LLC Agreement and approved by the Administrator, of an Award shall take such Award subject to the
terms of the Plan, the Profits Interest Award Agreement pursuant to which such Award was issued, and the LLC Agreement. Upon such Transfer, such transferee shall, automatically and without further action on his or her part, be deemed to be a party
to, signatory of and bound by the LLC Agreement as a Member. Any such transferee must, upon the request of the Company, execute an instrument in form and substance acceptable to the Company agreeing to be bound by the Plan, the Profits Interest
Award Agreement pursuant to which such Award was issued, and the LLC Agreement, and must agree to such other waivers, limitations, and restrictions as the Company may reasonably require. Any Transfer of the Class B Common Units issued under an
Award which is not made in compliance with the Plan, the LLC Agreement and the Profits Interest Award Agreement pursuant to which such Award was issued shall be null and void ab initio and of no force or effect. 

6.2.    Amendment, Suspension or Termination of the Plan. Except as otherwise provided in this
Section 6.2 hereof, the Plan may be wholly or partially amended or otherwise modified, suspended or terminated at any time and from time to time by the Board; provided, however, that any amendment that requires
Member approval under applicable law shall be subject to such approval to the extent required to comply with such law. No amendment, suspension or termination of the Plan shall materially alter or impair any rights or obligations of a Participant
under any outstanding Award theretofore granted without the consent of the affected Participant, unless the Award itself otherwise expressly so provides. No Award may be granted during any period of suspension or after termination of the Plan, and
in no event may any Award be granted under the Plan after the tenth (10th) anniversary of the Effective Date. For the avoidance of doubt, the creation or issuance of additional Awards or
Class B Common Units or 

  
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any other equity interests in the Company (including any amendments to the LLC Agreement necessary to establish the rights and preferences of, and restrictions applicable to, any such Units or
other equity interests) shall not constitute a material impairment of the rights of any Participant under any outstanding Award that would require the Participant’s consent under this Section 6.2. 

6.3.    Changes in Capitalization and Other Corporate Events. 

(a)    (i)    Subject to Section 6.3(a)(ii) below, in the event that the
Administrator determines, in its sole discretion, that any dividend or other distribution (whether in the form of cash, additional Class B Common Units, other Securities, or other property), any Capital Contributions, any Equity Restructuring,
any recapitalization, reclassification, reorganization, change to corporate form, merger, consolidation, split-up, spin-off, combination, repurchase, liquidation,
dissolution, or sale, transfer, exchange or other disposition of all or substantially all of the assets of the Company (including, but not limited to, a Change in Control or conversion into a C-Corporation),
or exchange of Class B Common Units or other Securities of the Company, issuance of warrants or other rights to purchase Class B Common Units or other Securities of the Company, or other similar transaction or event, in any case, affects
the Class B Common Units such that an adjustment is determined by the Administrator to be appropriate in order to prevent the inequitable dilution or enlargement of the benefits or potential benefits intended to be made available under the Plan
or with respect to an Award, then the Administrator may equitably adjust any or all of: 
 (I)    the
number of Class B Common Units or the number and kind of Securities with respect to which Awards may be granted under the Plan (including, but not limited to, adjustments of the limitations in Section 2.1 hereof on the
maximum number and kind of Class B Common Units or Securities which may be issued); 
 (II)    the
number of Class B Common Units or the number and kind of Securities subject to outstanding Awards; and 

(III)    the purchase price, if any, and/or the Threshold Value with respect to any Award. 

(ii)    Notwithstanding the foregoing, if any transaction or event described in
Section 6.3(a)(i) hereof constitutes an Equity Restructuring: 
 (I)    The
number and type of securities subject to each outstanding Award and the purchase price thereof, if applicable, shall be proportionately adjusted. Such adjustments shall be nondiscretionary and final and binding on the affected Participants and the
Company; and 
 (II)    The Administrator shall make such proportionate adjustments, if any, as the
Administrator in its discretion may deem appropriate to reflect such Equity Restructuring with respect to the number and kind of Securities that may be granted under the Plan (including, but not limited to, adjustments of the limitations in
Section 2.1 hereof on the maximum number and kind of Class B Common Units or Securities which may be issued). 

  
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 (b)    In the event of any Change in Control or other transaction or
event described in Section 6.3(a) hereof or any unusual or nonrecurring transactions or events affecting the Company, any Affiliate of the Company, or the financial statements of the Company or any Affiliate, or of changes
in applicable laws, regulations, or accounting principles, the Administrator in its discretion, and on such terms and conditions as it deems appropriate, is hereby authorized to take any one or more of the following actions whenever the
Administrator determines that such action is appropriate in order to prevent the inequitable dilution or enlargement of the benefits or potential benefits intended to be made available under the Plan or with respect to any Award under the Plan, to
facilitate such transactions or events or to give effect to such changes in laws, regulations or principles: 

(i)    The Administrator may provide, either by the terms of the agreement or by action taken prior to the occurrence of
such transaction or event, for either (A) the purchase of all or any portion of such Award for an amount of cash equal to the amount that could have been attained upon the realization of the Participant’s rights had such Award (or portion
thereof) been fully vested, or (B) the replacement of such Award with other rights or property selected by the Administrator in its sole discretion, which replacement award may be subject to vesting or the lapsing of restrictions, as
applicable, on terms no less favorable to the affected Participant than the terms of the Award for which such replacement award is substituted; 

(ii)    The Administrator may provide, either by the terms of such Award or by action taken prior to the occurrence of
such transaction or event, that upon such event, such Award be assumed by the successor or survivor entity, or a parent or subsidiary thereof, or shall be substituted for by similar awards covering the stock or Securities of the successor or
survivor entity, or a parent or subsidiary thereof, with appropriate adjustments as to the number and kind of Securities subject to such Award and prices thereof; and 

(iii)    The Administrator may make adjustments in the number and type of Class B Common Units (or other Securities
or property) subject to outstanding Awards and/or in the terms and conditions of (including the purchase price, the repurchase price, the vesting schedule and/or Threshold Value), and the criteria included in, outstanding Awards and Awards which may
be granted in the future. 
 (c)    Subject to Section 6.3(b) hereof, the Administrator may,
in its discretion, include such further provisions and limitations in any Award as it may deem equitable and in the best interests of the Company with respect to any transaction or event described in this Section 6.3. For
the avoidance of doubt, the issuance of additional Class B Common Units in the Company shall not, in and of itself, trigger any adjustments pursuant to this Section 6.3. 

6.4.    Section 83(b) Election. Unless otherwise determined by the Administrator in its sole discretion, each
Participant who is granted an Award under the Plan shall be required to make an election under Section 83(b) of the Code with respect to the Class B Common Units subject to such Award, and the grant of such Award shall be conditioned on
the Participant making such Section 83(b) election. 

  
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 6.5.    Tax Withholding. The Company or an Affiliate, as
applicable, may withhold from each Participant’s wages, or require each Participant to pay to such entity, any applicable withholding or employment taxes resulting from the issuance of any Award hereunder, from the vesting or lapse of any
restrictions imposed on such Award, or from the ownership or disposition of any Class B Common Units (in each case, if any). 

6.6.    No Right to Continued Employment or Service. Nothing in the Plan or in any Profits Interest Award Agreement
shall confer upon any Participant any right to continue in the employment or service of the Company or any Affiliate, or shall interfere with or restrict in any way the rights of the Company or any Affiliate, which rights are hereby expressly
reserved, to discharge any Participant at any time for any reason whatsoever, with or without Cause, except to the extent expressly provided otherwise in a written agreement between the Participant and the Company or any of its Affiliates. 

6.7.    Compliance with Laws. The Plan, the granting and vesting of Awards under the Plan, the issuance and
delivery of Class B Common Units pursuant to the Awards, and any payment or distributions of money under the Plan or under the Awards granted hereunder are subject to compliance with all applicable foreign, federal and state laws, rules and
regulations (including, but not limited to, state and federal securities laws and federal margin requirements) and to such approvals by any listing, regulatory or governmental authority as may, in the opinion of counsel for the Company, be necessary
or advisable in connection therewith. Any Securities delivered under the Plan shall be subject to such restrictions, and the Person acquiring such Securities shall, if requested by the Company, provide such assurances and representations to the
Company as the Company may deem necessary or desirable to assure compliance with all applicable legal requirements. To the extent permitted by applicable law, the Plan and any Awards awarded hereunder shall be deemed amended to the extent necessary
to conform to such laws, rules and regulations. 
 6.8.    Headings. Headings are provided herein for convenience
only and are not to serve as a basis for interpretation or construction of the Plan. 
 6.9.    Governing Law.
The Plan and any agreements hereunder shall be administered, interpreted and enforced under the internal laws of the State of Delaware without regard to conflicts of laws thereof. 

6.10.    Section 409A. No Award or Class B Common Unit is intended to constitute or provide for
“nonqualified deferred compensation” within the meaning of Section 409A of the Code. To the extent that the Administrator determines that any Award granted under the Plan is subject to Section 409A of the Code, the Profits
Interest Award Agreement evidencing such Award shall incorporate the terms and conditions required by Section 409A of the Code. Notwithstanding any provision of the Plan to the contrary, in the event that, following the Effective Date, the
Administrator determines that any Award may be subject to Section 409A of the Code and related Department of Treasury guidance (including such Department of Treasury guidance as may be issued after the Effective Date), the Administrator may
adopt such 

  
 12 

 
amendments to the Plan and the applicable Profits Interest Award Agreement or take any other actions (including amendments and actions with retroactive effect), that the Administrator determines
are necessary or appropriate to preserve the intended tax treatment of the Award, including without limitation, actions intended to (a) exempt the Award from Section 409A of the Code and/or preserve the intended tax treatment of the
benefits provided with respect to the Award, or (b) comply with the requirements of Section 409A of the Code and related Department of Treasury guidance; provided, however, that nothing in this Section 6.10
shall create any obligation on the part of the Company or any Affiliate to adopt any such amendment or take any such other action or any liability for any failure to do so. Notwithstanding anything herein to the contrary, in no event shall the
Company or any Affiliate have any obligation to indemnify or otherwise compensate any Participant for any taxes or interest imposed under Section 409A of the Code, or similar provisions of state law. 

  
 13 

 I hereby certify that the foregoing Plan was duly adopted by the Board of Directors of
Zentalis Pharmaceuticals, LLC on December 21, 2017. 
 Executed on December 21, 2017. 

 

			
	By:	 	 /s/ Anthony Sun

	Name:	 	 Anthony Sun

	Title:	 	 Chief Executive Officer

 ZENTALIS PHARMACEUTICALS, LLC 

PROFITS INTEREST AWARD AGREEMENT 

THIS PROFITS INTEREST AWARD AGREEMENT (this “Agreement”) is made and entered into as of
[            ] (the “Grant Date”), by and between Zentalis Pharmaceuticals, LLC, a Delaware limited liability company (the “Company”), and
[            ] (“Participant”). Capitalized terms used in this Agreement but not otherwise defined herein shall have their respective meanings set forth in the Plan
and the LLC Agreement (each as defined below), as applicable. 
 THE PARTIES HERETO AGREE AS FOLLOWS: 

1.    Issuance of Award; Threshold Amount. 

1.1    Issuance of Award. In consideration of Participant’s agreement to provide services to or for the
benefit of the Company and its Affiliates, effective as of the Grant Date, the Company hereby (a) issues to Participant an Award of [            ] Class B Common Units (the
“Class B Common Units”) of the Company (the “Award”), and (b) if not already a Member, admits Participant as a Member of the Company, on the terms and conditions set forth herein, in the
Zentalis Pharmaceuticals, LLC 2017 Profits Interest Plan (the “Plan”) and in the Amended and Restated Limited Liability Company Agreement of Zentalis Pharmaceuticals, LLC, dated as of December 21, 2017, as amended and/or
restated from time to time (the “LLC Agreement”). The Company and Participant acknowledge and agree that the Award is hereby issued to Participant for the performance of services to or for the benefit of the Company and its
Affiliates in his or her capacity as a Member or in anticipation of Participant becoming a Member. Upon receipt of the Award, Participant shall, automatically and without further action on his or her part, be deemed to be a party to, signatory of
and bound by the LLC Agreement. Participant further acknowledges and agrees that (w) Participant received a copy of the LLC Agreement on or prior to the Grant Date, (x) the execution by Participant of this Agreement evidences
Participant’s intention to be bound by the terms of the LLC Agreement in addition to the terms of this Agreement, (y) the LLC Agreement may be amended or amended and restated from time to time in accordance with its terms, and (z) the
Class B Common Units are subject to all of the terms and restrictions set forth in the LLC Agreement as may be in effect from time to time. Participant shall execute the LLC Agreement or a joinder or counterpart signature page thereto and
deliver such executed joinder or counterpart signature page to the Company with this Agreement. Participant acknowledges that the Company may from time to time issue or cancel (or otherwise modify) Class B Common Units in accordance with the
terms of the LLC Agreement. 
 1.2    Threshold Amount. The Threshold Amount with respect to each Class B
Common Unit subject to the Award shall be $[            ]. 

2.    Vesting; Termination of Service; Restrictions on Award 

2.1    Vesting. Subject to Section 2.2 below and the LLC Agreement, the Award shall vest
according to the Vesting Schedule attached hereto as Exhibit A. 

 2.2    Termination of Service. In the event of
Participant’s Termination of Service, (a) the Award and all Class B Common Units, to the extent not vested as of the date of such Termination of Service (the “Termination Date”) (after taking into consideration any
accelerated vesting that may occur in connection with such termination, if any), together with the proportionate amount of Participant’s Capital Account balance attributable to such unvested Class B Common Units (if any), shall thereupon
automatically and without further action be cancelled and forfeited, and Participant shall have no further right or interest in or with respect to such unvested Class B Common Units (or such proportionate amount of Participant’s Capital
Account balance), and (b) no portion of the Award and no Class B Common Units which are unvested as of Participant’s Termination of Service shall thereafter become vested. Notwithstanding the foregoing, in the event of a Termination
of Service for Cause, all Class B Common Units (both vested and unvested) as of the Termination Date (and the proportionate amount of Participant’s Capital Account balance attributable to such Class B Common Units), shall thereupon
automatically and without further action be cancelled and forfeited, and Participant shall have no further right or interest in or with respect to such Class B Common Units (or such proportionate amount of Participant’s Capital Account
balance). 
 2.3    Restrictions on Awards. The Award and the Class B Common Units are subject to the terms
of the Plan and the terms of the LLC Agreement, including, without limitation, the Transfer and other restrictions set forth in the LLC Agreement. Any permitted transferee of the Award or Class B Common Units shall take such Award and
Class B Common Units subject to the terms of the Plan, this Agreement and the LLC Agreement. Any such permitted transferee must, upon the request of the Company, execute an instrument in form and substance acceptable to the Company agreeing to
be bound by the Plan, the LLC Agreement and this Agreement, and must agree to such other waivers, limitations and restrictions as the Company may reasonably require. Any Transfer of the Award or Class B Common Units which is not made in
compliance with the Plan, the LLC Agreement and this Agreement shall be null and void ab initio and of no force or effect. 

3.    Representations, Warranties, Covenants and Acknowledgments of Participant. Participant hereby represents,
warrants, covenants, acknowledges and agrees on behalf of Participant and his or her spouse, if applicable, that: 

3.1    Investment; Status of Participant. Participant is holding the Award for Participant’s own account, and
not for the account of any other Person. Participant is holding the Award for investment and not with a view to distribution or resale thereof except in compliance with applicable laws regulating securities. 

3.2    Relation to Company. Participant is presently an Employee, Consultant or Director and in such capacity has
become personally familiar with the business of the Company and its Affiliates. 
 3.3    Access to Information.
Participant has had the opportunity to ask questions of, and to receive answers from, the Company with respect to the terms and conditions of the transactions contemplated hereby and with respect to the business, affairs, financial conditions, and
results of operations of the Company. 

  
 2 

 3.4    Registration. Participant understands that the
Class B Common Units have not been registered under the Securities Act, and the Class B Common Units cannot be transferred by Participant other than in accordance with the terms and conditions set forth in the Plan, this Agreement and the
LLC Agreement and, in any event, unless such Class B Common Units are registered under the Securities Act or an exemption from such registration is available. Neither the Company nor any of its Affiliates has made any agreements, covenants or
undertakings whatsoever to register the Class B Common Units under the Securities Act. Neither the Company nor any of its Affiliates has made any representations, warranties or covenants whatsoever as to whether any exemption from the
Securities Act is available. 
 3.5    Public Trading. None of the Company’s Securities is presently
publicly traded, and neither the Company nor any of its Affiliates has made any representations, covenants or agreements as to whether there will be a public market for any of the Company’s Securities. 

3.6    Tax Advice. Neither the Company nor any of its Affiliates or their representatives has made any warranties
or representations to Participant with respect to the income tax consequences of the issuance of the Class B Common Units or the transactions contemplated by this Agreement (including, without limitation, with respect to the making of an
election under Section 83(b) of the Code), and Participant is in no manner relying on the Company or any of its Affiliates or their representatives for an assessment of such tax consequences. Participant is advised to consult with his or her
own tax advisor with respect to such tax consequences and his or her ownership of the Class B Common Units. 

4.    Capital Account. Participant shall make no Capital Contribution to the Company with respect to the Award and,
as a result, Participant’s Capital Account balance in the Company immediately after his or her receipt of the Class B Common Units shall be equal to zero, unless Participant was a Member in the Company prior to such issuance, in which case
Participant’s Capital Account balance shall not be increased as a result of his or her receipt of the Class B Common Units. 

5.    Section 83(b) Election. Participant covenants that he or she shall make an election under Section 83(b)
of the Code (and any comparable election in the state of Participant’s residence) with respect to the Class B Common Units covered by the Award within thirty (30) calendar days following the Grant Date. In connection with such
election, Participant and Participant’s spouse, if applicable, shall execute and deliver to the Company (or to the person for whom the services were performed) with this executed Agreement, a copy of the Election Pursuant to Section 83(b)
of the Internal Revenue Code substantially in the form attached hereto as Exhibit B. Participant represents that Participant has consulted any tax consultant(s) that Participant deems advisable in connection with the filing
of an election under Section 83(b) of the Code and similar state tax provisions. Participant acknowledges that it is Participant’s sole responsibility and not the responsibility of the Company or any of its Affiliates to timely file an
election under Section 83(b) of the Code (and any comparable state election), even if Participant requests that the Company or its Affiliates or any of their representatives make such filing on Participant’s behalf. Participant should
consult his or her tax advisor to determine if there is a comparable election to file in the state of his or her residence. 

  
 3 

 6.    Taxes. The Company and Participant intend that (a) the
Class B Common Units be treated as “profits interests” within the meaning of the Code, Treasury Regulations promulgated thereunder, and any published guidance by the Internal Revenue Service with respect thereto, including, without
limitation, Internal Revenue Service Revenue Procedure 93-27, 1993-2 C.B. 343, as clarified by Internal Revenue Service Revenue Procedure
2001-43, 2001-2 C.B. 191, (b) the issuance of such interests not be a taxable event to the Company or Participant as provided in such Revenue Procedure, and (c) the
LLC Agreement, the Plan and this Agreement be interpreted consistently with such intent. Notwithstanding the foregoing, the Company or its Affiliates, as applicable, may withhold from Participant’s wages, or require Participant to pay to such
entity, any applicable withholding or employment taxes resulting from the issuance of the Award hereunder, from the vesting or lapse of any restrictions imposed on the Award, or from the ownership or disposition of the Class B Common Units.

 7.    Remedies. Participant shall be liable to the Company for all costs and damages, including incidental and
consequential damages, resulting from a disposition of the Award or the Class B Common Units which is in violation of the provisions of this Agreement. Without limiting the generality of the foregoing, Participant agrees that the Company and
its Affiliates shall be entitled to obtain specific performance of the obligations of Participant under this Agreement and immediate injunctive relief in the event any action or proceeding is brought in equity to enforce the same. Participant shall
not urge as a defense that there is an adequate remedy at law. 
 8.    Governing Law. This Agreement shall be
governed by and construed in accordance with the laws of the State of Delaware without regard to any otherwise governing principles of conflicts of law. 

9.    Certificate Restrictive Legends. Certificates evidencing the Award, to the extent such certificates are
issued, may bear such restrictive legends as the Company and/or the Company’s counsel may deem necessary or advisable under applicable law or pursuant to this Agreement, including, without limitation, the following legends or legends
substantially similar thereto: 
 “The offering and sale of the securities represented hereby have not been registered
under the Securities Act of 1933, as amended (the “Securities Act”). Any transfer of such securities will be invalid unless a Registration Statement under the Securities Act is in effect as to such transfer or in the opinion of counsel for
USAT Holdings, LLC such registration is unnecessary in order for such transfer to comply with the Securities Act.” 

“The securities represented hereby are subject to forfeiture, a right of repurchase, restrictions as to transferability
and other restrictions as set forth in (i) an Profits Interest Award Agreement by and between the holder and Zentalis Pharmaceuticals, LLC, (ii) the Zentalis Pharmaceuticals, LLC 2017 Profits Interest Plan and (iii) the Amended and
Restated Limited Liability Company Agreement of Zentalis Pharmaceuticals, LLC, in each case, as may be amended and/or restated from time to time, and such securities may not be sold or otherwise transferred except pursuant to the provisions of such
documents.” 

  
 4 

 10.    Market Standoff. Participant hereby agrees that if so
requested by the Company or any representative of the underwriters in connection with any registration of the offering of any securities of the Company under the Securities Act, Participant shall not, directly or indirectly, sell, offer to sell,
grant any option for the sale of, or otherwise dispose of or transfer, any Securities or other securities of the Company during the 180-day period following the effective date of a registration statement of
the Company filed under the Securities Act; provided, however, that such restriction shall apply only to the first two registration statements of the Company to become effective under the Securities Act which include securities to be sold on
behalf of the Company to the public in an underwritten public offering under the Securities Act. The Company may place a restrictive legend on any security issued to Participant and/or impose stop-transfer instructions with respect to the securities
subject to the foregoing restrictions until the end of such 180-day period. 

11.    No Right to Continued Service. Nothing in this Agreement shall confer upon Participant any right to continue
in the employment or service of the Company (including for the avoidance of doubt any of its Affiliates), or shall interfere with or restrict in any way the rights of the Company or any of its Affiliates, which rights are hereby expressly reserved,
to discharge Participant at any time for any reason whatsoever, with or without Cause, except to the extent expressly provided otherwise in a written agreement between Participant and the Company or any of Affiliates. 

12.    Counterparts. This Agreement may be executed in any number of counterparts, any of which may be executed and
transmitted (without limitation) by facsimile, electronic mail, portable document format (PDF) or any electronic signature complying with the U.S. federal ESIGN Act of 2000 (e.g., www.docusign.com), and each of which shall be deemed to be an
original, but all of which together shall be deemed to be one and the same instrument. 
 13.    Successors and
Assigns. Subject to the limitations set forth in this Agreement, this Agreement shall be binding upon, and inure to the benefit of, the executors, administrators, heirs, legal representatives, successors and assigns of the parties hereto. 

14.    Entire Agreement; Amendments and Waivers. This Agreement, together with the Plan and the LLC Agreement,
constitutes the entire agreement among the parties pertaining to the subject matter hereof and supersedes all prior agreements, understandings, negotiations and discussions, whether oral or written, of the parties. This Agreement may not be amended
except in an instrument in writing signed by Participant and a duly authorized representative of the Company. No amendment, supplement, modification or waiver of this Agreement shall be binding unless executed in writing by the party to be bound
thereby. No waiver of any of the provisions of this Agreement shall be deemed or shall constitute a waiver of any other provision hereof (whether or not similar), nor shall such waiver constitute a continuing waiver unless otherwise expressly
provided. 

  
 5 

 15.    Invalidity. If any term, provision, covenant or condition
of this Agreement is held by a court of competent jurisdiction to exceed the limitations permitted by applicable law, then the provisions will be deemed reformed to the maximum limitations permitted by applicable law and the parties hereby expressly
acknowledge their desire that in such event such action be taken. If for any reason one or more of the provisions contained in this Agreement or in any other instrument referred to herein, shall, for any reason, be held to be invalid, illegal or
unenforceable in any respect, then to the maximum extent permitted by law, such invalidity, illegality or unenforceability shall not affect any other provision of this Agreement or any other such instrument. 

16.    Titles. The titles, captions or headings of the sections herein are inserted for convenience of reference
only and are not intended to be a part of or to affect the meaning or interpretation of this Agreement. 
 [Signature pages follow]

  
 6 

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

			
	 Zentalis Pharmaceuticals, LLC,
 a
Delaware limited liability company

 
			
		
	By:	 	  

 
			
	Name:	 	
	Title:	 	

 [Signature Page to Zentalis Pharmaceuticals, LLC Profits Interest Award Agreement] 

 Participant hereby accepts and agrees to be bound by all of the terms and conditions of this
Agreement. 
  

			
	PARTICIPANT:
	
	      

	Print Name:	 	  

 Participant’s spouse indicates by the execution of this Agreement his or her consent to be bound by
the terms herein as to his or her interests, whether as community property or otherwise, if any, in the Class B Common Units. 
  

			
	Participant’s Spouse:
	
	      

	Print Name:	 	  

 [Signature Page to Zentalis Pharmaceuticals, LLC Profits Interest Award Agreement] 

 EXHIBIT A 

VESTING SCHEDULE 
 Capitalized terms used
in this Exhibit A shall have the meanings given to them in the Agreement to which this Exhibit A is attached. 
 Vesting Commencement Date:
[            ]. 
 A-1 

 EXHIBIT B 

ELECTION PURSUANT TO SECTION 83(b) OF THE 

INTERNAL REVENUE CODE TO INCLUDE IN GROSS 

INCOME THE EXCESS OVER THE PURCHASE PRICE, 

IF ANY, OF THE VALUE OF PROPERTY TRANSFERRED 

IN CONNECTION WITH SERVICES 

The undersigned hereby elects pursuant to Section 83(b) of the Internal Revenue Code of 1986, as amended, to include in the
undersigned’s gross income for the          taxable year the excess (if any) of the fair market value of the property described below, over the amount the undersigned paid for such property, if
any, and supplies herewith the following information in accordance with the Treasury Regulations promulgated under Section 83(b): 

1.    The undersigned’s name, address and taxpayer identification (social security) number are: 

 

	
	Name:
                                         
                                 
	Address:
                                         
                              
	Social Security #:
                                         
               

 The undersigned’s spouse’s name, address and taxpayer identification (social security) number
are (complete if applicable): 
  

	
	 Name:
                                         
                                 

	 Address:
                                         
                              

	Social Security #:
                                         
               

 2.    The property with respect to which the election is made consists of
             Class B Common Units (the “Award”) of Zentalis Pharmaceuticals, LLC, a Delaware limited liability company (the “Company”),
representing an interest in the future profits, losses and distributions of the Company. 
 3.    The date on which the
above property was transferred to the undersigned was                 , and the taxable year to which this election relates is
            . 
 4.    The above property is subject
to the following restrictions: (a) forfeiture if the undersigned ceases to be an employee or director of or consultant to the Company or an affiliate, and (b) certain other restrictions set forth in the Amended and Restated Limited
Liability Company Agreement of Zentalis Pharmaceuticals, LLC (as amended and/or restated from time to time, the “LLC Agreement”), should the undersigned wish to transfer the Award (in whole or in part). 

  
 B-1 

 5.    The Award with respect to which this election is being made is a
“profits interest” received by the undersigned taxpayer in connection with the provision of services to or for the benefit of the Company. The Award does not relate to a substantially certain and predictable stream of income from Company
assets; the undersigned taxpayer does not intend to dispose of the Award within two years of receipt; and the Award is not an interest in a “publicly traded partnership.” Thus, as described in Revenue Procedure 93-27, 1993-2 C.B. 343, and Revenue Procedure 2001-43, 2001-2 C.B. 191, the fair market value
of the above property at the time of transfer (determined without regard to any restrictions other than those which by their terms will never lapse) is $0. 

6.    The amount paid for the above property by the undersigned was $0. 

7.    The undersigned taxpayer will file this election with the Internal Revenue Service office with which taxpayer files
his or her annual income tax return not later than 30 days after the date of transfer of the property. A copy of this election will be furnished to the Company or to the person for whom the services were performed, and the original will be filed
with the income tax return of the undersigned to which this election relates. The undersigned is the person performing the services in connection with which the property was transferred. 

 

			
		  	                                      
                                         
     
	Date:                         	  	Print Name:
                                         
                      
		
		  	                                      
                                         
     
	Date:                         	  	Print Name of Spouse:
                                         
      

  
 B-2 

 ZENTALIS PHARMACEUTICALS, LLC JOINDER AGREEMENT 

This Joinder Agreement (this “Joinder Agreement”) is entered into with effect as of
                ,          by the undersigned (the “Joining Member”), with respect to the Amended
and Restated Limited Liability Company Agreement (as amended from time to time, the “LLC Agreement”) of Zentalis Pharmaceuticals, LLC, a Delaware limited liability company (the “Company”), made and entered into as
of December 21, 2017, among the Members from time to time party thereto. Capitalized terms used but not defined herein shall have the meaning set forth in the LLC Agreement. 

WHEREAS, (i) on or about the date hereof, the Joining Member has received Class B Common Units; and (ii) it is a condition
precedent to the issuance of such Class B Common Units and the admission of such Joining Member as an Additional Member of the Company that the Joining Member execute a Joinder Agreement to the LLC Agreement. 

NOW, THEREFORE, the Joining Member hereby: (i) acknowledges receipt of a copy of the LLC Agreement; (ii) joins fully in the LLC
Agreement as a “Additional Member,” and shall be bound by, and have the benefits as a “Member” of, all the terms and conditions of the LLC Agreement as if such Joining Member was a signatory thereto as a “Member”; and
(iii) agrees that the Class B Common Units issued to such Joining Member are subject to the LLC Agreement. 
 IN WITNESS WHEREOF,
the Joining Member has executed this Joinder Agreement as of the date first written above. 
  

			
	JOINING MEMBER:	  	
		
	                                      
                                         
   	  	
	Print Name:
                                         
                    	  	
		
	Notice Address:	  	
	                                      
                                         
   	  	
	                                      
                                         
   	  	
	                                      
                                         
   	  	
	Tel:
                                         
                                 	  	
	Email:
                                         
                             	  	
		
		  	Accepted:
		
		  	ZENTALIS PHARMACEUTICALS, LLC
		
		  	By:
                                         
                                       
		  	Name:
		  	Title:EX-10.4

 Exhibit 10.4 

ZENTALIS PHARMACEUTICALS, INC. 

2020 EMPLOYEE STOCK PURCHASE PLAN 

ARTICLE 1. 
 PURPOSE

 The purposes of this Zentalis Pharmaceuticals, Inc. 2020 Employee Stock Purchase Plan (as it may be amended or restated from time to
time, the “Plan”) are to assist Eligible Employees of Zentalis Pharmaceuticals, Inc., a Delaware corporation (the “Company”), and its Designated Subsidiaries in acquiring a stock ownership interest in
the Company pursuant to a plan which is intended to qualify as an “employee stock purchase plan” within the meaning of Section 423(b) of the Code, and to help Eligible Employees provide for their future security and to encourage them
to remain in the employment of the Company and its Designated Subsidiaries. For the avoidance of doubt, this Plan gives effect to the Corporate Conversion to be effected by the Company in connection with its initial public offering, and all share
numbers are on an as-converted basis. 
 ARTICLE 2. 

DEFINITIONS AND CONSTRUCTION 

Wherever the following terms are used in the Plan they shall have the meanings specified below, unless the context clearly indicates
otherwise. The singular pronoun shall include the plural where the context so indicates. Masculine, feminine and neuter pronouns are used interchangeably and each comprehends the others. 

2.1    “Administrator” means the entity that conducts the general administration of the Plan as
provided in Article XI. The term “Administrator” shall refer to the Committee unless the Board has assumed the authority for administration of the Plan as provided in Article XI. 

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

2.3    “Board” means the Board of Directors of the Company. 

2.4    “Change in Control” means and includes each of the following: 

(a)    A transaction or series of transactions (other than an offering of Common Stock to the general public through a
registration statement filed with the Securities and Exchange Commission or a transaction or series of transactions that meets the requirements of clauses (i) and (ii) of subsection (c) below) whereby any “person” or related
“group” of “persons” (as such terms are used in Sections 13(d) and 14(d)(2) of the Exchange Act) (other than the Company, any of its Subsidiaries, an employee benefit plan maintained by the Company or any of its Subsidiaries or a
“person” that, prior to such transaction, directly or indirectly controls, is controlled by, or is under common control with, the 

 
Company) directly or indirectly acquires beneficial ownership (within the meaning of Rule 13d-3 under the Exchange Act) of securities of the Company
possessing more than 50% of the total combined voting power of the Company’s securities outstanding immediately after such acquisition; or 

(b)    During any period of two consecutive years, individuals who, at the beginning of such period, constitute the Board
together with any new Director(s) (other than a Director designated by a person who shall have entered into an agreement with the Company to effect a transaction described in subsections (a) or (c)) whose election by the Board or nomination for
election by the Company’s stockholders was approved by a vote of at least two-thirds of the Directors then still in office who either were Directors at the beginning of the
two-year period or whose election or nomination for election was previously so approved, cease for any reason to constitute a majority thereof; or 

(c)    The consummation by the Company (whether directly involving the Company or indirectly involving the Company through
one or more intermediaries) of (x) a merger, consolidation, reorganization, or business combination or (y) a sale or other disposition of all or substantially all of the Company’s assets in any single transaction or series of related
transactions or (z) the acquisition of assets or stock of another entity, in each case other than a transaction: 

(i)    which results in the Company’s voting securities outstanding immediately before the transaction continuing to
represent (either by remaining outstanding or by being converted into voting securities of the Company or the person that, as a result of the transaction, controls, directly or indirectly, the Company or owns, directly or indirectly, all or
substantially all of the Company’s assets or otherwise succeeds to the business of the Company (the Company or such person, the “Successor Entity”)) directly or indirectly, at least a majority of the combined voting power of
the Successor Entity’s outstanding voting securities immediately after the transaction, and 
 (ii)    after which
no person or group beneficially owns voting securities representing 50% or more of the combined voting power of the Successor Entity; provided, however, that no person or group shall be treated for purposes of this clause
(ii) as beneficially owning 50% or more of the combined voting power of the Successor Entity solely as a result of the voting power held in the Company prior to the consummation of the transaction. 

The Administrator shall have full and final authority, which shall be exercised in its sole discretion, to determine conclusively whether a
Change in Control has occurred pursuant to the above definition, the date of such Change in Control and any incidental matters relating thereto. 

2.5    “Code” means the Internal Revenue Code of 1986, as amended, and the regulations issued
thereunder. 
 2.6    “Common Stock” means the common stock of the Company and such other
securities of the Company that may be substituted therefor pursuant to Article VIII. 

2.7    “Company” means Zentalis Pharmaceuticals, Inc., a Delaware corporation formed upon the
statutory conversion of Zentalis Pharmaceuticals, LLC from a Delaware limited liability company into a Delaware corporation. 

2.8    “Compensation” of an Eligible Employee means the gross base compensation received by such
Eligible Employee as compensation for services to the Company or any Designated Subsidiary, including prior week adjustment and overtime payments but excluding vacation pay, holiday pay, jury duty pay, funeral leave pay, military leave pay,
commissions, incentive compensation, one-time bonuses (e.g., retention or sign on bonuses), education or tuition reimbursements, travel expenses, business and moving reimbursements, income received in
connection with any stock options, stock appreciation rights, restricted stock, restricted stock units or other compensatory equity awards, fringe benefits, other special payments and all contributions made by the Company or any Designated
Subsidiary for the Employee’s benefit under any employee benefit plan now or hereafter established. 

2.9    “Corporate Conversion” means the conversion of Zentalis
Pharmaceuticals, LLC, a Delaware limited liability company, into the Company pursuant to a statutory conversion, effected in connection with
the Company’s initial public offering. 

  
 2 

 2.10    “Designated Subsidiary” means any
Subsidiary designated by the Administrator in accordance with Section 11.3(b). 

2.11    “Director” means a Board member. 

2.12    “Effective Date” means the day on which the Corporate Conversion occurs. For the avoidance
of doubt, the Plan shall become effective immediately prior to the Corporate Conversion to be effected by the Company in connection with its initial public offering, and in all events will be effective prior to the Public Trading Time. 

2.13    “Eligible Employee” means an Employee who does not, immediately after any rights under
this Plan are granted, own (directly or through attribution) stock possessing 5% or more of the total combined voting power or value of all classes of Common Stock and other stock of the Company, a Parent or a Subsidiary (as determined under
Section 423(b)(3) of the Code). For purposes of the foregoing sentence, the rules of Section 424(d) of the Code with regard to the attribution of stock ownership shall apply in determining the stock ownership of an individual, and stock
that an Employee may purchase under outstanding options shall be treated as stock owned by the Employee; provided, however, that the Administrator may provide in an Offering Document that an Employee shall not be eligible to participate in an
Offering Period if: (a) such Employee is a highly compensated employee within the meaning of Section 423(b)(4)(D) of the Code, (b) such Employee has not met a service requirement designated by the Administrator pursuant to
Section 423(b)(4)(A) of the Code (which service requirement may not exceed two years), (c) such Employee’s customary employment is for twenty hours or less per week, (d) such Employee’s customary employment is for less than five
months in any calendar year and/or (e) such Employee is a citizen or resident of a foreign jurisdiction and the grant of a right to purchase Common Stock under the Plan to such Employee would be prohibited under the laws of such foreign
jurisdiction or the grant of a right to purchase Common Stock under the Plan to such Employee in compliance with the laws of such foreign jurisdiction would cause the Plan to violate the requirements of Section 423 of the Code, as determined by
the Administrator in its sole discretion; provided, further, that any exclusion in clauses (a), (b), (c), (d) or (e) shall be applied in an identical manner under each Offering Period to all Employees, in accordance with Treasury Regulation Section 1.423-2(e). 
 2.14    “Employee” means any
officer or other employee (as defined in accordance with Section 3401(c) of the Code) of the Company or any Designated Subsidiary. “Employee” shall not include any director of the Company or a Designated Subsidiary who does not render
services to the Company or a Designated Subsidiary as an employee within the meaning of Section 3401(c) of the Code. For purposes of the Plan, the employment relationship shall be treated as continuing intact while the individual is on sick
leave or other leave of absence approved by the Company or Designated Subsidiary and meeting the requirements of Treasury Regulation Section 1.421-1(h)(2). Where the period of leave exceeds three months
and the individual’s right to reemployment is not guaranteed either by statute or by contract, the employment relationship shall be deemed to have terminated on the first day immediately following such three-month period. 

2.15    “Enrollment Date” means the first day of each Offering Period. 

2.16    “Exchange Act” means the Securities Exchange Act of 1934, as amended from time to time.

  
 3 

 2.17    “Fair Market Value” means, as of any
date, the value of a share of Common Stock determined as follows: (a) if the Common Stock is listed on any established stock exchange, its Fair Market Value will be the closing sales price for such Common Stock as quoted on such exchange for
such date, or if no sale occurred on such date, the last day preceding such date during which a sale occurred, as reported in The Wall Street Journal or another source the Administrator deems reliable; (b) if the Common Stock is not traded on a
stock exchange but is quoted on a national market or other quotation system, the closing sales price on such date, or if no sales occurred on such date, then on the last date preceding such date during which a sale occurred, as reported in The Wall
Street Journal or another source the Administrator deems reliable; or (c) without an established market for the Common Stock, the Administrator will determine the Fair Market Value in its discretion. 

2.18    “Grant Date” means the first Trading Day of an Offering Period. 

2.19    “Offering Document” shall have the meaning given to such term in Section 4.1. 

2.20    “Offering Period” shall have the meaning given to such term in Section 4.1. 

2.21    “Parent” means any corporation, other than the Company, in an unbroken chain of
corporations ending with the Company if, at the time of the determination, each of the corporations other than the Company owns stock possessing 50% or more of the total combined voting power of all classes of stock in one of the other corporations
in such chain. 
 2.22    “Participant” means any Eligible Employee who has executed a
subscription agreement and been granted rights to purchase Common Stock pursuant to the Plan. 

2.23    “Plan” means this Zentalis Pharmaceuticals, Inc. 2020 Employee Stock Purchase Plan, as it
may be amended from time to time. 
 2.24    “Public Trading Time” means the time at
which the Company’s Registration Statement on Form S-1 filed in connection with its initial public offering is declared effective by the Securities and Exchange Commission. 

2.25    “Purchase Date” means the last Trading Day of each Purchase Period. 

2.26    “Purchase Period” shall refer to one or more periods within an Offering Period, as
designated in the applicable Offering Document; provided, however, that, in the event no Purchase Period is designated by the Administrator in the applicable Offering Document, the Purchase Period for each Offering Period covered by such Offering
Document shall be the same as the applicable Offering Period. 
 2.27    “Purchase Price” means
the purchase price designated by the Administrator in the applicable Offering Document (which purchase price shall not be less than 85% of the Fair Market Value of a Share on the Grant Date or on the Purchase Date, whichever is lower);
provided, however, that, in the event no purchase price is designated by the Administrator in the applicable Offering Document, the purchase price for the Offering Periods covered by such Offering Document shall be 85% of the Fair
Market Value of a Share on the Grant Date or on the Purchase Date, whichever is lower; provided, further, that the Purchase Price may be adjusted by the Administrator pursuant to Article VIII and shall not be less than the par
value of a Share. 
 2.28    “Securities Act” means the Securities Act of 1933, as amended. 

2.29    “Share” means a share of Common Stock. 

  
 4 

 2.30    “Subsidiary” means any corporation,
other than the Company, in an unbroken chain of corporations beginning with the Company if, at the time of the determination, each of the corporations other than the last corporation in an unbroken chain owns stock possessing 50% or more of the
total combined voting power of all classes of stock in one of the other corporations in such chain; provided, however, that a limited liability company or partnership may be treated as a Subsidiary to the extent either (a) such entity is
treated as a disregarded entity under Treasury Regulation Section 301.7701-3(a) by reason of the Company or any other Subsidiary that is a corporation being the sole owner of such entity, or (b) such
entity elects to be classified as a corporation under Treasury Regulation Section 301.7701-3(a) and such entity would otherwise qualify as a Subsidiary. 

2.31    “Trading Day” means a day on which national stock exchanges in the United States are open
for trading. 
 ARTICLE 3. 

SHARES SUBJECT TO THE PLAN 

3.1    Number of Shares. Subject to Article VIII, the aggregate number of Shares that may be issued pursuant
to rights granted under the Plan shall be 450,000 Shares. In addition to the foregoing, subject to Article VIII, on the first day of each calendar year beginning on January 1, 2021 and ending on and including January 1, 2030, the
number of Shares available for issuance under the Plan shall be increased by that number of Shares equal to the least of (a) 1,500,000 Shares, (b) 1% of the Shares outstanding on the final day of the immediately preceding calendar year and
(c) such smaller number of Shares as determined by the Board. If any right granted under the Plan shall for any reason terminate without having been exercised, the Common Stock not purchased under such right shall again become available for
issuance under the Plan. Notwithstanding anything in this Section 3.1 to the contrary, the number of Shares that may be issued or transferred pursuant to the rights granted under the Plan shall not exceed an aggregate of 15,450,000 Shares,
subject to Article VIII. 
 3.2    Stock Distributed. Any Common Stock distributed pursuant to the Plan may
consist, in whole or in part, of authorized and unissued Common Stock, treasury stock or Common Stock purchased on the open market. 

ARTICLE 4. 
 OFFERING
PERIODS; OFFERING DOCUMENTS; PURCHASE DATES 
 4.1    Offering Periods. The Administrator may from time to
time grant or provide for the grant of rights to purchase Common Stock under the Plan to Eligible Employees during one or more periods (each, an “Offering Period”) selected by the Administrator. The terms and conditions
applicable to each Offering Period shall be set forth in an “Offering Document” adopted by the Administrator, which Offering Document shall be in such form and shall contain such terms and conditions as the Administrator
shall deem appropriate and shall be incorporated by reference into and made part of the Plan and shall be attached hereto as part of the Plan. The Administrator shall establish in each Offering Document one or more Purchase Periods during such
Offering Period during which rights granted under the Plan shall be exercised and purchases of Shares carried out during such Offering Period in accordance with such Offering Document and the Plan. The provisions of separate Offering Periods under
the Plan need not be identical. 

  
 5 

 4.2    Offering Documents. Each Offering Document with respect to
an Offering Period shall specify (through incorporation of the provisions of this Plan by reference or otherwise): 

(a)    the length of the Offering Period, which period shall not exceed twenty-seven months; 

(b)    the length of the Purchase Period(s) within the Offering Period; 

(c)    the maximum number of Shares that may be purchased by any Eligible Employee during such Offering Period, which, in
the absence of a contrary designation by the Administrator, shall be 100,000 Shares; 
 (d)    in connection with
each Offering Period that contains more than one Purchase Period, the maximum aggregate number of shares which may be purchased by any Eligible Employee during each Purchaser Period, which, in the absence of a contrary designation by the
Administrator, shall be 100,000 Shares; and 
 (e)    such other provisions as the Administrator determines are
appropriate, subject to the Plan. 
 ARTICLE 5. 

ELIGIBILITY AND PARTICIPATION 

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

5.2    Enrollment in Plan. 

(a)    Except as otherwise set forth in an Offering Document or determined by the Administrator, an Eligible Employee may
become a Participant in the Plan for an Offering Period by delivering a subscription agreement to the Company by such time prior to the Enrollment Date for such Offering Period (or such other date specified in the Offering Document) designated by
the Administrator and in such form as the Company provides. 
 (b)    Each subscription agreement shall designate a whole
percentage of such Eligible Employee’s Compensation to be withheld by the Company or the Designated Subsidiary employing such Eligible Employee on each payday during the Offering Period as payroll deductions under the Plan, or, if permitted by
the Administrator, contributions to be made by such Eligible Employee. The designated percentage may not be less than 1% and may not be more than the maximum percentage specified by the Administrator in the applicable Offering Document (which
percentage shall be 20% in the absence of any such designation). The payroll deductions or, if permitted by the Administrator, contributions made for each Participant shall be credited to an account for such Participant under the Plan and shall be
deposited with the general funds of the Company. 
 (c)    A Participant may increase or decrease the percentage of
Compensation designated in his or her subscription agreement, subject to the limits of this Section 5.2, or may suspend his or her payroll deductions, or, if permitted by the Administrator, contributions, at any time during an Offering Period;
provided, however, that the Administrator may limit the number of changes a Participant may make to his or her payroll deduction elections or, if permitted by the Administrator, contributions, during each Offering Period in the applicable Offering
Document (and in the absence of any specific 

  
 6 

 
designation by the Administrator, a Participant shall be allowed one change to his or her payroll deduction elections or, if permitted by the Administrator, contributions, during each Offering
Period). Any such change or suspension of payroll deductions, or, if permitted by the Administrator, contributions, shall be effective with the first full payroll period that is at least five business days after the Company’s receipt of the new
subscription agreement (or such shorter or longer period as may be specified by the Administrator in the applicable Offering Document). In the event a Participant suspends his or her payroll deductions or contributions, such Participant’s
cumulative payroll deductions or contributions prior to the suspension shall remain in his or her account and shall be applied to the purchase of Shares on the next occurring Purchase Date and shall not be paid to such Participant unless he or she
withdraws from participation in the Plan pursuant to Article VII. 
 (d)    Except as set forth in Section 5.8, as
otherwise set forth in an Offering Document or determined by the Administrator, a Participant may participate in the Plan only by means of payroll deduction and may not make contributions by lump sum payment for any Offering Period. 

5.3    Payroll Deductions. Except as otherwise provided in the applicable Offering Document or Section 5.8,
payroll deductions for a Participant shall commence on the first payroll following the Enrollment Date and shall end on the last payroll in the Offering Period to which the Participant’s authorization is applicable, unless sooner terminated by
the Participant as provided in Article VII or suspended by the Participant or the Administrator as provided in Section 5.2 and Section 5.6, respectively. 

5.4    Effect of Enrollment. A Participant’s completion of a subscription agreement will enroll such
Participant in the Plan for each subsequent Offering Period on the terms contained therein until the Participant either submits a new subscription agreement, withdraws from participation under the Plan as provided in Article VII or otherwise
becomes ineligible to participate in the Plan. 
 5.5    Limitation on Purchase of Common Stock. An Eligible
Employee may be granted rights under the Plan only if such rights, together with any other rights granted to such Eligible Employee under “employee stock purchase plans” of the Company, any Parent or any Subsidiary, as specified by
Section 423(b)(8) of the Code, do not permit such employee’s rights to purchase stock of the Company or any Parent or Subsidiary to accrue at a rate that exceeds $25,000 of the fair market value of such stock (determined as of the time
which such rights are granted) for each calendar year in which such rights are outstanding at any time. This limitation shall be applied in accordance with Section 423(b)(8) of the Code. 

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

5.7    Foreign Employees. In order to facilitate participation in the Plan, the Administrator may provide for such
special terms applicable to Participants who are citizens or residents of a foreign jurisdiction, or who are employed by a Designated Subsidiary outside of the United States, as the Administrator may consider necessary or appropriate to accommodate
differences in local law, tax policy or custom. Such special terms may not be more favorable than the terms of rights granted under the Plan to Eligible Employees who are residents of the United States. Moreover, the Administrator may approve

  
 7 

 
such supplements to, or amendments, restatements or alternative versions of, this Plan as it may consider necessary or appropriate for such purposes without thereby affecting the terms of this
Plan as in effect for any other purpose. No such special terms, supplements, amendments or restatements shall include any provisions that are inconsistent with the terms of this Plan as then in effect unless this Plan could have been amended to
eliminate such inconsistency without further approval by the stockholders of the Company. 
 5.8    Leave of
Absence. During leaves of absence approved by the Company meeting the requirements of Treasury Regulation Section 1.421-1(h)(2) under the Code, a Participant may continue participation in the Plan by
making cash payments to the Company on his or her normal payday equal to his or her authorized payroll deduction. 
 ARTICLE 6. 

GRANT AND EXERCISE OF RIGHTS 

6.1    Grant of Rights. On the Grant Date of each Offering Period, each Eligible Employee participating in such
Offering Period shall be granted a right to purchase the maximum number of Shares specified under Section 4.2, subject to the limits in Section 5.5, and shall have the right to buy, on each Purchase Date during such Offering Period (at the
applicable Purchase Price), such number of whole Shares as is determined by dividing (a) such Participant’s payroll deductions or permitted contributions accumulated prior to such Purchase Date and retained in the Participant’s
account as of the Purchase Date, by (b) the applicable Purchase Price (rounded down to the nearest Share). The right shall expire on the earlier of: (x) the last Purchase Date of the Offering Period, (y) last day of the Offering
Period and (z) the date on which the Participant withdraws in accordance with Section 7.1 or Section 7.3. 

6.2    Exercise of Rights. On each Purchase Date, each Participant’s accumulated payroll deductions or
permitted contributions and any other additional payments specifically provided for in the applicable Offering Document will be applied to the purchase of whole Shares, up to the maximum number of Shares permitted pursuant to the terms of the Plan
and the applicable Offering Document, at the Purchase Price. No fractional Shares shall be issued upon the exercise of rights granted under the Plan, unless the Offering Document specifically provides otherwise. Any cash in lieu of fractional Shares
remaining after the purchase of whole Shares upon exercise of a purchase right will be credited to a Participant’s account and returned to the Participant in one lump sum payment in a subsequent payroll check as soon as practicable after the
Exercise Date, unless the Administrator provides that such amounts should be rolled over to the next occurring Offering Period in the applicable Offering Document. Shares issued pursuant to the Plan may be evidenced in such manner as the
Administrator may determine and may be issued in certificated form or issued pursuant to book-entry procedures. 

6.3    Pro Rata Allocation of Shares. If the Administrator determines that, on a given Purchase Date, the number of
Shares with respect to which rights are to be exercised may exceed (a) the number of Shares that were available for issuance under the Plan on the Enrollment Date of the applicable Offering Period, or (b) the number of Shares available for
issuance under the Plan on such Purchase Date, the Administrator may in its sole discretion provide that the Company shall make a pro rata allocation of the Shares available for purchase on such Enrollment Date or Purchase Date, as applicable, in as
uniform a manner as shall be practicable and as it shall determine in its sole discretion to be equitable among all Participants for whom rights to purchase Common Stock are to be exercised pursuant to this Article VI on such Purchase Date, and
shall either (i) continue all Offering Periods then in effect, or (ii) terminate any or all Offering Periods then in effect pursuant to Article IX. The Company may make pro rata allocation of the Shares available on the Enrollment
Date of any applicable Offering Period pursuant to the preceding sentence, notwithstanding any authorization of additional Shares for issuance under the Plan by 

  
 8 

 
the Company’s stockholders subsequent to such Enrollment Date. The balance of the amount credited to the account of each Participant that has not been applied to the purchase of Shares shall
be paid to such Participant in one lump sum in cash as soon as reasonably practicable after the Purchase Date. 

6.4    Withholding. At the time a Participant’s rights under the Plan are exercised, in whole or in part, or
at the time some or all of the Common Stock issued under the Plan is disposed of, the Participant must make adequate provision for the Company’s federal, state, or other tax withholding obligations, if any, that arise upon the exercise of the
right or the disposition of the Common Stock. At any time, the Company may, but shall not be obligated to, withhold from the Participant’s compensation the amount necessary for the Company to meet applicable withholding obligations, including
any withholding required to make available to the Company any tax deductions or benefits attributable to sale or early disposition of Common Stock by the Participant.  

6.5    Conditions to Issuance of Common Stock. The Company shall not be required to issue or deliver any
certificate or certificates for, or make any book entries evidencing, Shares purchased upon the exercise of rights under the Plan prior to fulfillment of all of the following conditions: 

(a)    The admission of such Shares to listing on all stock exchanges, if any, on which the Common Stock is then listed;

 (b)    The completion of any registration or other qualification of such Shares under any state or federal law or
under the rulings or regulations of the Securities and Exchange Commission or any other governmental regulatory body, that the Administrator shall, in its absolute discretion, deem necessary or advisable; 

(c)    The obtaining of any approval or other clearance from any state or federal governmental agency that the
Administrator shall, in its absolute discretion, determine to be necessary or advisable; 
 (d)    The payment to the
Company of all amounts that it is required to withhold under federal, state or local law upon exercise of the rights, if any; and 

(e)    The lapse of such reasonable period of time following the exercise of the rights as the Administrator may from time
to time establish for reasons of administrative convenience. 
 ARTICLE 7. 

WITHDRAWAL; CESSATION OF ELIGIBILITY 

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

  
 9 

 7.2    Future Participation. A Participant’s withdrawal from
an Offering Period shall not have any effect upon his or her eligibility to participate in any similar plan that may hereafter be adopted by the Company or a Designated Subsidiary or in subsequent Offering Periods that commence after the termination
of the Offering Period from which the Participant withdraws. 
 7.3    Cessation of Eligibility. Upon a
Participant’s ceasing to be an Eligible Employee for any reason, he or she shall be deemed to have elected to withdraw from the Plan pursuant to this Article VII and the payroll deductions credited to such Participant’s account or
contributions made by such Participant during the Offering Period shall be paid to such Participant or, in the case of his or her death, to the person or persons entitled thereto under Section 12.4, as soon as reasonably practicable, and such
Participant’s rights for the Offering Period shall be automatically terminated. 
 ARTICLE 8. 

ADJUSTMENTS UPON CHANGES IN STOCK 

8.1    Changes in Capitalization. Subject to Section 8.3, in the event that the Administrator determines that
any dividend or other distribution (whether in the form of cash, Common Stock, other securities, or other property), Change in Control, reorganization, merger, amalgamation, consolidation, combination, repurchase, recapitalization, liquidation,
dissolution, or sale, transfer, exchange or other disposition of all or substantially all of the assets of the Company, or sale or exchange of Common Stock or other securities of the Company, issuance of warrants or other rights to purchase Common
Stock or other securities of the Company, or other similar corporate transaction or event, as determined by the Administrator, affects the Common Stock such that an adjustment is determined by the Administrator to be appropriate in order to prevent
dilution or enlargement of the benefits or potential benefits intended by the Company to be made available under the Plan or with respect to any outstanding purchase rights under the Plan, the Administrator shall make equitable adjustments, if any,
to reflect such change with respect to (a) the aggregate number and type of Shares (or other securities or property) that may be issued under the Plan (including, but not limited to, adjustments of the limitations in Section 3.1 and the
limitations established in each Offering Document pursuant to Section 4.2 on the maximum number of Shares that may be purchased); (b) the class(es) and number of Shares and price per Share subject to outstanding rights; and (c) the
Purchase Price with respect to any outstanding rights. 
 8.2    Other Adjustments. Subject to Section 8.3,
in the event of any transaction or event described in Section 8.1 or any unusual or nonrecurring transactions or events affecting the Company, any affiliate of the Company, or the financial statements of the Company or any affiliate (including
without limitation any Change in Control), or of changes in Applicable Law or accounting principles, the Administrator, in its discretion, and on such terms and conditions as it deems appropriate, is hereby authorized to take any one or more of the
following actions whenever the Administrator determines that such action is appropriate in order to prevent the dilution or enlargement of the benefits or potential benefits intended to be made available under the Plan or with respect to any right
under the Plan, to facilitate such transactions or events or to give effect to such changes in laws, regulations or principles: 

(a)    To provide for either (i) termination of any outstanding right in exchange for an amount of cash, if any, equal
to the amount that would have been obtained upon the exercise of such right had such right been currently exercisable or (ii) the replacement of such outstanding right with other rights or property selected by the Administrator in its sole
discretion; 
 (b)    To provide that the outstanding rights under the Plan shall be assumed by the successor or survivor
corporation, or a parent or subsidiary thereof, or shall be substituted for by similar rights covering the stock of the successor or survivor corporation, or a parent or subsidiary thereof, with appropriate adjustments as to the number and kind of
shares and prices; 

  
 10 

 (c)    To make adjustments in the number and type of Shares (or other
securities or property) subject to outstanding rights under the Plan and/or in the terms and conditions of outstanding rights and rights that may be granted in the future; 

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

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

8.3    No Adjustment Under Certain Circumstances. No adjustment or action described in this Article VIII or in
any other provision of the Plan shall be authorized to the extent that such adjustment or action would cause the Plan to fail to satisfy the requirements of Section 423 of the Code. 

8.4    No Other Rights. Except as expressly provided in the Plan, no Participant shall have any rights by reason of
any subdivision or consolidation of shares of stock of any class, the payment of any dividend, any increase or decrease in the number of shares of stock of any class or any dissolution, liquidation, merger, or consolidation of the Company or any
other corporation. Except as expressly provided in the Plan or pursuant to action of the Administrator under the Plan, no issuance by the Company of shares of stock of any class, or securities convertible into shares of stock of any class, shall
affect, and no adjustment by reason thereof shall be made with respect to, the number of Shares subject to outstanding rights under the Plan or the Purchase Price with respect to any outstanding rights. 

ARTICLE 9. 
 AMENDMENT,
MODIFICATION AND TERMINATION 
 9.1    Amendment, Modification and Termination. The Administrator may amend,
suspend or terminate the Plan at any time and from time to time; provided, however, that approval of the Company’s stockholders shall be required to amend the Plan to: (a) increase the aggregate number, or change the
type, of shares that may be sold pursuant to rights under the Plan under Section 3.1 (other than an adjustment as provided by Article VIII); (b) change the corporations or classes of corporations whose employees may be granted rights under
the Plan; or (c) change the Plan in any manner that would cause the Plan to no longer be an “employee stock purchase plan” within the meaning of Section 423(b) of the Code. 

9.2    Certain Changes to Plan. Without stockholder consent and without regard to whether any Participant rights
may be considered to have been adversely affected, to the extent permitted by Section 423 of the Code, the Administrator shall be entitled to change or terminate the Offering Periods, limit the frequency and/or number of changes in the amount
withheld from Compensation during an Offering Period, establish the exchange ratio applicable to amounts withheld in a currency other than U.S. dollars, permit payroll withholding in excess of the amount designated by a Participant in order to
adjust for delays or mistakes in the Company’s processing of payroll withholding elections, establish reasonable waiting and adjustment periods and/or accounting and crediting procedures to ensure that amounts applied toward the purchase of
Common Stock for each Participant properly correspond with amounts withheld from the Participant’s Compensation, and establish such other limitations or procedures as the Administrator determines in its sole discretion to be advisable that are
consistent with the Plan. 

  
 11 

 9.3    Actions In the Event of Unfavorable Financial Accounting
Consequences. In the event the Administrator determines that the ongoing operation of the Plan may result in unfavorable financial accounting consequences, the Administrator may, in its discretion and, to the extent necessary or desirable,
modify or amend the Plan to reduce or eliminate such accounting consequence including, but not limited to: 

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

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

9.4    Payments Upon Termination of Plan. Upon termination of the Plan, the balance in each Participant’s Plan
account shall be refunded as soon as practicable after such termination, without any interest thereon. 
 ARTICLE 10. 

TERM OF PLAN 
 The Plan
shall be effective on the Effective Date. The Plan shall be in effect until terminated under Section 9.1 hereof. No rights may be granted under the Plan during any period of suspension of the Plan or after termination of the Plan. The Plan was
initially approved by the Board on March 28, 2020. The Plan was initially approved by the equityholders of the Company on March 29, 2020. 

ARTICLE 11. 

ADMINISTRATION 

11.1    Administrator. Unless otherwise determined by the Board, the Administrator of the Plan shall be the
Compensation Committee of the Board (or another committee or a subcommittee of the Board to which the Board delegates administration of the Plan) (such committee, the “Committee”). The Board may at any time vest in the Board
any authority or duties for administration of the Plan. 
 11.2    Action by the Administrator. Unless otherwise
established by the Board or in any charter of the Administrator, a majority of the Administrator shall constitute a quorum. The acts of a majority of the members present at any meeting at which a quorum is present and, subject to Applicable Law and
the Bylaws of the Company, acts approved in writing by a majority of the Administrator in lieu of a meeting, shall be deemed the acts of the Administrator. Each member of the Administrator is entitled to, in good faith, rely or act upon any report
or other information furnished to that member by any officer or other employee of the Company or any Designated Subsidiary, the Company’s independent certified public accountants, or any executive compensation consultant or other professional
retained by the Company to assist in the administration of the Plan. 

  
 12 

 11.3    Authority of Administrator. The Administrator shall have
the power, subject to, and within the limitations of, the express provisions of the Plan: 
 (a)    To determine when and
how rights to purchase Common Stock shall be granted and the provisions of each offering of such rights (which need not be identical). 

(b)    To designate from time to time which Subsidiaries of the Company shall be Designated Subsidiaries, which designation
may be made without the approval of the stockholders of the Company. 
 (c)    To construe and interpret the Plan and
rights granted under it, and to establish, amend and revoke rules and regulations for its administration. The Administrator, in the exercise of this power, may correct any defect, omission or inconsistency in the Plan, in a manner and to the extent
it shall deem necessary or expedient to make the Plan fully effective. 
 (d)    To amend, suspend or terminate the Plan
as provided in Article IX. 
 (e)    Generally, to exercise such powers and to perform such acts as the
Administrator deems necessary or expedient to promote the best interests of the Company and its Subsidiaries and to carry out the intent that the Plan be treated as an “employee stock purchase plan” within the meaning of Section 423
of the Code. 
 11.4    Decisions Binding. The Administrator’s interpretation of the Plan, any rights
granted pursuant to the Plan, any subscription agreement and all decisions and determinations by the Administrator with respect to the Plan are final, binding, and conclusive on all parties. 

ARTICLE 12. 

MISCELLANEOUS 

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

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

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

(a)    A Participant may, in the manner determined by the Administrator, file a written designation of a beneficiary who is
to receive any Shares and/or cash, if any, from the Participant’s account under the Plan in the event of such Participant’s death subsequent to a Purchase Date on which the Participant’s rights are exercised but prior to delivery to
such Participant of such Shares and/or cash. 

  
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 In addition, a Participant may file a written designation of a beneficiary who is to receive any cash from
the Participant’s account under the Plan in the event of such Participant’s death prior to exercise of the Participant’s rights under the Plan. If the Participant is married and resides in a community property state, a designation of
a person other than the Participant’s spouse as his or her beneficiary shall not be effective without the prior written consent of the Participant’s spouse. 

(b)    Such designation of beneficiary may be changed by the Participant at any time by written notice to the Company. In
the event of the death of a Participant and in the absence of a beneficiary validly designated under the Plan who is living at the time of such Participant’s death, the Company shall deliver such Shares and/or cash to the executor or
administrator of the estate of the Participant, or if no such executor or administrator has been appointed (to the knowledge of the Company), the Company, in its discretion, may deliver such Shares and/or cash to the spouse or to any one or more
dependents or relatives of the Participant, or if no spouse, dependent or relative is known to the Company, then to such other person as the Company may designate. 

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

12.6    Equal Rights and Privileges. Subject to Section 5.7, all Eligible Employees will have equal rights and
privileges under this Plan so that this Plan qualifies as an “employee stock purchase plan” within the meaning of Section 423 of the Code. Subject to Section 5.7, any provision of this Plan that is inconsistent with
Section 423 of the Code will, without further act or amendment by the Company, the Board or the Administrator, be reformed to comply with the equal rights and privileges requirement of Section 423 of the Code. 

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

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

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

12.11    Governing Law. The Plan and any agreements hereunder shall be administered, interpreted and enforced under
the internal laws of the State of Delaware without regard to conflicts of laws thereof or of any other jurisdiction. 

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

* * * * * 

  
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