Document:

EX-10.3

 Exhibit 10.3 

NANTKWEST, INC. 
 2015
EQUITY INCENTIVE PLAN 
 1. Purposes of the Plan. The purposes of this Plan are: 

 

	 	•	 	to attract and retain the best available personnel for positions of substantial responsibility, 

  

	 	•	 	to provide additional incentive to Employees, Directors and Consultants, and 

  

	 	•	 	to promote the success of the Company’s business. 

 The Plan permits the grant of
Incentive Stock Options, Nonstatutory Stock Options, Restricted Stock, Restricted Stock Units, Stock Appreciation Rights, Performance Units and Performance Shares. 

2. Definitions. As used herein, the following definitions will apply: 

(a) “Administrator” means the Board or any of its Committees as will be administering the Plan, in accordance with
Section 4 of the Plan. 
 (b) “Applicable Laws” means the legal and regulatory requirements relating to the
administration of equity-based awards and the related issuance of Shares thereunder, including but not limited to U.S. federal and state corporate laws, U.S. federal and state securities laws, the Code, any stock exchange or quotation system on
which the Common Stock is listed or quoted and the applicable laws of any non-U.S. country or jurisdiction where Awards are, or will be, granted under the Plan. 

(c) “Award” means, individually or collectively, a grant under the Plan of Options, Stock Appreciation Rights, Restricted
Stock, Restricted Stock Units, Performance Units or Performance Shares. 
 (d) “Award Agreement” means the written or
electronic agreement setting forth the terms and provisions applicable to each Award granted under the Plan. The Award Agreement is subject to the terms and conditions of the Plan. 

(e) “Board” means the Board of Directors of the Company. 

(f) “Change in Control” means the occurrence of any of the following events: 

(i) A change in the ownership of the Company which occurs on the date that any one person, or more than one person acting as a group
(“Person”), acquires ownership of the stock of the Company that, together with the stock held by such Person, constitutes more than fifty percent (50%) of the total voting power of the stock of the Company;

 
provided, however, that for purposes of this subsection, the acquisition of additional stock by any one Person, who is considered to own more than fifty percent (50%) of the total voting
power of the stock of the Company will not be considered a Change in Control; or 
 (ii) A change in the effective control of the Company
which occurs on the date that a majority of members of the Board is replaced during any twelve (12) month period by Directors whose appointment or election is not endorsed by a majority of the members of the Board prior to the date of the
appointment or election. For purposes of this clause (ii), if any Person is considered to be in effective control of the Company, the acquisition of additional control of the Company by the same Person will not be considered a Change in Control; or

 (iii) A change in the ownership of a substantial portion of the Company’s assets which occurs on the date that any Person acquires
(or has acquired during the twelve (12) month period ending on the date of the most recent acquisition by such person or persons) assets from the Company that have a total gross fair market value equal to or more than fifty percent
(50%) of the total gross fair market value of all of the assets of the Company immediately prior to such acquisition or acquisitions; provided, however, that for purposes of this subsection (iii), the following will not constitute a change in
the ownership of a substantial portion of the Company’s assets: (A) a transfer to an entity that is controlled by the Company’s stockholders immediately after the transfer, or (B) a transfer of assets by the Company to:
(1) a stockholder of the Company (immediately before the asset transfer) in exchange for or with respect to the Company’s stock, (2) an entity, fifty percent (50%) or more of the total value or voting power of which is
owned, directly or indirectly, by the Company, (3) a Person, that owns, directly or indirectly, fifty percent (50%) or more of the total value or voting power of all the outstanding stock of the Company, or (4) an entity, at least
fifty percent (50%) of the total value or voting power of which is owned, directly or indirectly, by a Person described in this subsection (iii)(B)(3). For purposes of this subsection (iii), gross fair market value means the value of the assets
of the Company, or the value of the assets being disposed of, determined without regard to any liabilities associated with such assets. 

For purposes of this definition, persons will be considered to be acting as a group if they are owners of a corporation that enters into a
merger, consolidation, purchase or acquisition of stock, or similar business transaction with the Company. 
 Notwithstanding the
foregoing, a transaction will not be deemed a Change in Control unless the transaction qualifies as a change in control event within the meaning of Code Section 409A, as it has been and may be amended from time to time, and any proposed or
final Treasury Regulations and Internal Revenue Service guidance that has been promulgated or may be promulgated thereunder from time to time. 

Further and for the avoidance of doubt, a transaction will not constitute a Change in Control if: (i) its sole purpose is to change the
state of the Company’s incorporation, or (ii) its sole purpose is to create a holding company that will be owned in substantially the same proportions by the persons who held the Company’s securities immediately before such
transaction. 

  
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 (g) “Code” means the Internal Revenue Code of 1986, as amended. Reference to a
specific section of the Code or regulation thereunder will include such section or regulation, any valid regulation promulgated under such section, and any comparable provision of any future legislation or regulation amending, supplementing or
superseding such section or regulation. 
 (h) “Committee” means a committee of Directors or of other individuals
satisfying Applicable Laws appointed by the Board, or a duly authorized committee of the Board, in accordance with Section 4 hereof. 

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

(j) “Company” means NantKwest, Inc., a Delaware corporation, or any successor thereto. 

(k) “Consultant” means any natural person, including an advisor, engaged by the Company or a Parent or Subsidiary to render
bona fide services to such entity, provided the services (i) are not in connection with the offer or sale of securities in a capital-raising transaction, and (ii) do not directly promote or maintain a market for the Company’s
securities, in each case, within the meaning of Form S-8 promulgated under the Securities Act. 
 (l) “Director” means a
member of the Board. 
 (m) “Disability” means total and permanent disability as defined in Section 22(e)(3) of
the Code, provided that in the case of Awards other than Incentive Stock Options, the Administrator in its discretion may determine whether a permanent and total disability exists in accordance with uniform and non-discriminatory standards adopted
by the Administrator from time to time. 
 (n) “Employee” means any person, including Officers and Directors, employed by
the Company or any Parent or Subsidiary of the Company. Neither service as a Director nor payment of a director’s fee by the Company will be sufficient to constitute “employment” by the Company. 

(o) “Exchange Act” means the Securities Exchange Act of 1934, as amended. 

(p) “Exchange Program” means a program under which (i) outstanding Awards are surrendered or cancelled in exchange for
awards of the same type (which may have higher or lower exercise prices and different terms), awards of a different type, and/or cash, (ii) Participants would have the opportunity to transfer any outstanding Awards to a financial institution or
other person or entity selected by the Administrator, and/or (iii) the exercise price of an outstanding Award is increased or reduced. The Administrator will determine the terms and conditions of any Exchange Program in its sole discretion.

 (q) “Fair Market Value” means, as of any date, the value of Common Stock determined as follows: 

  
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 (i) If the Common Stock is listed on any established stock exchange or a national market system,
including without limitation the New York Stock Exchange, the NASDAQ Global Select Market, the NASDAQ Global Market or the NASDAQ Capital Market of The NASDAQ Stock Market, its Fair Market Value will be the closing sales price for such stock (or the
closing bid, if no sales were reported) as quoted on such exchange or system on the day of determination, as reported in The Wall Street Journal or such other source as the Administrator deems reliable; 

(ii) If the Common Stock is regularly quoted by a recognized securities dealer but selling prices are not reported, the Fair Market Value of
a Share will be the mean between the high bid and low asked prices for the Common Stock on the date of determination (or, if no bids and asks were reported on that date, as applicable, on the last trading date such bids and asks were reported), as
reported in The Wall Street Journal or such other source as the Administrator deems reliable; 
 (iii) For purposes of any Awards
granted on the Registration Date, the Fair Market Value will be the initial price to the public as set forth in the final prospectus included within the registration statement on Form S-1 filed with the Securities and Exchange Commission for the
initial public offering of the Common Stock; or 
 (iv) In the absence of an established market for the Common Stock, the Fair Market Value
will be determined in good faith by the Administrator. 
 (r) “Fiscal Year” means the fiscal year of the Company. 

(s) “Incentive Stock Option” means an Option that by its terms qualifies and is intended to qualify as an incentive stock
option within the meaning of Section 422 of the Code. 
 (t) “Inside Director” means a Director who is an Employee.

 (u) “Nonstatutory Stock Option” means an Option that by its terms does not qualify or is not intended to qualify as an
Incentive Stock Option. 
 (v) “Officer” means a person who is an officer of the Company within the meaning of
Section 16 of the Exchange Act and the rules and regulations promulgated thereunder. 
 (w) “Option” means a stock
option granted pursuant to the Plan. 
 (x) “Outside Director” means a Director who is not an Employee. 

(y) “Parent” means a “parent corporation,” whether now or hereafter existing, as defined in
Section 424(e) of the Code. 
 (z) “Participant” means the holder of an outstanding Award. 

  
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 (aa) “Performance Share” means an Award denominated in Shares which may be
earned in whole or in part upon attainment of performance goals or other vesting criteria as the Administrator may determine pursuant to Section 10. 

(bb) “Performance Unit” means an Award which may be earned in whole or in part upon attainment of performance goals or other
vesting criteria as the Administrator may determine and which may be settled for cash, Shares or other securities or a combination of the foregoing pursuant to Section 10. 

(cc) “Period of Restriction” means the period during which the transfer of Shares of Restricted Stock are subject to
restrictions and therefore, the Shares are subject to a substantial risk of forfeiture. Such restrictions may be based on the passage of time, the achievement of target levels of performance, or the occurrence of other events as determined by the
Administrator. 
 (dd) “Plan” means this 2015 Equity Incentive Plan. 

(ee) “Registration Date” means the effective date of the first registration statement that is filed by the Company and
declared effective pursuant to Section 12(b) of the Exchange Act, with respect to any class of the Company’s securities. 

(ff) “Restricted Stock” means Shares issued pursuant to a Restricted Stock award under Section 7 of the Plan, or issued
pursuant to the early exercise of an Option. 
 (gg) “Restricted Stock Unit” means a bookkeeping entry representing an
amount equal to the Fair Market Value of one Share, granted pursuant to Section 8. Each Restricted Stock Unit represents an unfunded and unsecured obligation of the Company. 

(hh) “Rule 16b-3” means Rule 16b-3 of the Exchange Act or any successor to Rule 16b-3, as in effect when discretion is being
exercised with respect to the Plan. 
 (ii) “Section 16(b)” means Section 16(b) of the Exchange Act. 

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

(kk) “Share” means a share of the Common Stock, as adjusted in accordance with Section 14 of the Plan. 

(ll) “Stock Appreciation Right” means an Award, granted alone or in connection with an Option, that pursuant to
Section 9 is designated as a Stock Appreciation Right. 
 (mm) “Subsidiary” means a “subsidiary
corporation,” whether now or hereafter existing, as defined in Section 424(f) of the Code. 
 3.
Stock Subject to the Plan. 

  
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 (a) Stock Subject to the Plan. Subject to the provisions of
Section 14 of the Plan, the maximum aggregate number of Shares that may be issued under the Plan is 3,500,000 Shares, plus the sum of (i) any Shares that, as of the Registration Date, have been reserved but not issued pursuant to any
awards granted under the Company’s 2014 Equity Incentive Plan, as amended (the “Existing Plan”), and are not subject to any awards granted thereunder, and (ii) any Shares subject to stock options or similar awards granted under
the Existing Plan that, on or after the Registration Date, expire or otherwise terminate without having been exercised in full and Shares issued pursuant to awards granted under the Existing Plan that are forfeited to or repurchased by the Company,
with the maximum number of Shares to be added to the Plan pursuant to clauses (i) and (ii) equal to 9,197,066. The Shares may be authorized, but unissued, or reacquired Common Stock. 

(b) Lapsed Awards. If an Award expires or becomes unexercisable without having been exercised in full, is surrendered pursuant to an
Exchange Program, or, with respect to Restricted Stock, Restricted Stock Units, Performance Units or Performance Shares, is forfeited to, or repurchased by, the Company due to failure to vest, then the unpurchased Shares (or for Awards other than
Options or Stock Appreciation Rights the forfeited or repurchased Shares), which were subject thereto will become available for future grant or sale under the Plan (unless the Plan has terminated). With respect to Stock Appreciation Rights, only
Shares actually issued (i.e., the net Shares issued) pursuant to a Stock Appreciation Right will cease to be available under the Plan; all remaining Shares under Stock Appreciation Rights will remain available for future grant or sale under the
Plan (unless the Plan has terminated). Shares that actually have been issued under the Plan under any Award will not be returned to the Plan and will not become available for future distribution under the Plan; provided, however, that if Shares
issued pursuant to Awards of Restricted Stock, Restricted Stock Units, Performance Shares or Performance Units are repurchased by the Company or are forfeited to the Company, such Shares will become available for future grant under the Plan. Shares
used to pay the exercise price of an Award or to satisfy the tax withholding obligations related to an Award will become available for future grant or sale under the Plan. To the extent an Award under the Plan is paid out in cash rather than Shares,
such cash payment will not result in reducing the number of Shares available for issuance under the Plan. Notwithstanding the foregoing and, subject to adjustment as provided in Section 14, the maximum number of Shares that may be issued upon
the exercise of Incentive Stock Options will equal the aggregate Share number stated in Section 3(a), plus, to the extent allowable under Section 422 of the Code, any Shares that become available for issuance under the Plan pursuant to
Section 3(c). 
 (c) Share Reserve. The Company, during the term of this Plan, will at all times reserve and keep available such
number of Shares as will be sufficient to satisfy the requirements of the Plan. 
 4. Administration of the Plan. 

(a) Procedure. 
 (i)
Multiple Administrative Bodies. Different Committees with respect to different groups of Service Providers may administer the Plan. 

  
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 (ii) Section 162(m). To the extent that the Administrator determines it to be
desirable to qualify Awards granted hereunder as “performance-based compensation” within the meaning of Section 162(m) of the Code, the Plan will be administered by a Committee of two (2) or more “outside
directors” within the meaning of Section 162(m) of the Code. 
 (iii) Rule 16b-3. To the extent desirable to qualify
transactions hereunder as exempt under Rule 16b-3, the transactions contemplated hereunder will be structured to satisfy the requirements for exemption under Rule 16b-3. 

(iv) Other Administration. Other than as provided above, the Plan will be administered by (A) the Board or (B) a Committee,
which committee will be constituted to satisfy Applicable Laws. 
 (b) Powers of the Administrator. Subject to the provisions of the
Plan, and in the case of a Committee, subject to the specific duties delegated by the Board to such Committee, the Administrator will have the authority, in its discretion: 

(i) to determine the Fair Market Value; 

(ii) to select the Service Providers to whom Awards may be granted hereunder; 

(iii) to determine the number of Shares to be covered by each Award granted hereunder; 

(iv) to approve forms of Award Agreements for use under the Plan; 

(v) to determine the terms and conditions, not inconsistent with the terms of the Plan, of any Award granted hereunder. Such terms and
conditions include, but are not limited to, the exercise price, the time or times when Awards may be exercised (which may be based on performance criteria), any vesting acceleration or waiver of forfeiture restrictions, and any restriction or
limitation regarding any Award or the Shares relating thereto, based in each case on such factors as the Administrator will determine; 

(vi) to institute and determine the terms and conditions of an Exchange Program; 

(vii) to construe and interpret the terms of the Plan and Awards granted pursuant to the Plan; 

(viii) to prescribe, amend and rescind rules and regulations relating to the Plan, including rules and regulations relating to sub-plans
established for the purpose of satisfying applicable foreign laws or for qualifying for favorable tax treatment under applicable foreign laws; 

(ix) to modify or amend each Award (subject to Section 19 of the Plan), including but not limited to the discretionary authority to
extend the post-termination 

  
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exercisability period of Awards and to extend the maximum term of an Option (subject to Section 6(b) of the Plan regarding Incentive Stock Options); 

(x) to allow Participants to satisfy tax withholding obligations in such manner as prescribed in Section 15 of the Plan; 

(xi) to authorize any person to execute on behalf of the Company any instrument required to effect the grant of an Award previously granted
by the Administrator; 
 (xii) to allow a Participant to defer the receipt of the payment of cash or the delivery of Shares that otherwise
would be due to such Participant under an Award; and 
 (xiii) to make all other determinations deemed necessary or advisable for
administering the Plan. 
 (c) Effect of Administrator’s Decision. The Administrator’s decisions, determinations and
interpretations will be final and binding on all Participants and any other holders of Awards. 
 5. Eligibility. Nonstatutory Stock
Options, Stock Appreciation Rights, Restricted Stock, Restricted Stock Units, Performance Shares and Performance Units may be granted to Service Providers. Incentive Stock Options may be granted only to Employees. 

6. Stock Options. 
 (a)
Limitations. Each Option will be designated in the Award Agreement as either an Incentive Stock Option or a Nonstatutory Stock Option. However, notwithstanding such designation, to the extent that the aggregate Fair Market Value of the Shares
with respect to which Incentive Stock Options are exercisable for the first time by the Participant during any calendar year (under all plans of the Company and any Parent or Subsidiary) exceeds one hundred thousand dollars ($100,000), such
Options will be treated as Nonstatutory Stock Options. For purposes of this Section 6(a), Incentive Stock Options will be taken into account in the order in which they were granted. The Fair Market Value of the Shares will be determined as of
the time the Option with respect to such Shares is granted. 
 (b) Term of Option. The term of each Option will be stated in the
Award Agreement. In the case of an Incentive Stock Option, the term will be ten (10) years from the date of grant or such shorter term as may be provided in the Award Agreement. Moreover, in the case of an Incentive Stock Option granted to a
Participant who, at the time the Incentive Stock Option is granted, owns stock representing more than ten percent (10%) of the total combined voting power of all classes of stock of the Company or any Parent or Subsidiary, the term of the
Incentive Stock Option will be five (5) years from the date of grant or such shorter term as may be provided in the Award Agreement. 

  
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 (c) Option Exercise Price and Consideration. 

(i) Exercise Price. The per share exercise price for the Shares to be issued pursuant to exercise of an Option will be determined by
the Administrator, subject to the following: 
 (1) In the case of an Incentive Stock Option 

(A) granted to an Employee who, at the time the Incentive Stock Option is granted, owns stock representing more than ten percent
(10%) of the voting power of all classes of stock of the Company or any Parent or Subsidiary, the per Share exercise price will be no less than one hundred ten percent (110%) of the Fair Market Value per Share on the date of grant. 

(B) granted to any Employee other than an Employee described in paragraph (A) immediately above, the per Share exercise price will be no
less than one hundred percent (100%) of the Fair Market Value per Share on the date of grant. 
 (2) In the case of a Nonstatutory
Stock Option, the per Share exercise price will be no less than one hundred percent (100%) of the Fair Market Value per Share on the date of grant. 

(3) Notwithstanding the foregoing, Options may be granted with a per Share exercise price of less than one hundred percent (100%) of the
Fair Market Value per Share on the date of grant pursuant to a transaction described in, and in a manner consistent with, Section 424(a) of the Code. 

(ii) Waiting Period and Exercise Dates. At the time an Option is granted, the Administrator will fix the period within which the
Option may be exercised and will determine any conditions that must be satisfied before the Option may be exercised. 
 (iii) Form of
Consideration. The Administrator will determine the acceptable form of consideration for exercising an Option, including the method of payment. In the case of an Incentive Stock Option, the Administrator will determine the acceptable form of
consideration at the time of grant. Such consideration may consist entirely of: (1) cash; (2) check; (3) promissory note, to the extent permitted by Applicable Laws; (4) other Shares, provided that such Shares have a Fair Market
Value on the date of surrender equal to the aggregate exercise price of the Shares as to which such Option will be exercised and provided that accepting such Shares will not result in any adverse accounting consequences to the Company, as the
Administrator determines in its sole discretion; (5) consideration received by the Company under a broker-assisted (or other) cashless exercise program (whether through a broker or otherwise) implemented by the Company in connection
with the Plan; (6) by net exercise; (7) such other consideration and method of payment for the issuance of Shares to the extent permitted by Applicable Laws; or (8) any combination of the foregoing methods of payment. 

  
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 (d) Exercise of Option. 

(i) Procedure for Exercise; Rights as a Stockholder. Any Option granted hereunder will be exercisable according to the terms of the
Plan and at such times and under such conditions as determined by the Administrator and set forth in the Award Agreement. An Option may not be exercised for a fraction of a Share. 

An Option will be deemed exercised when the Company receives: (i) a notice of exercise (in such form as the Administrator may specify
from time to time) from the person entitled to exercise the Option, and (ii) full payment for the Shares with respect to which the Option is exercised (together with applicable withholding taxes). Full payment may consist of any
consideration and method of payment authorized by the Administrator and permitted by the Award Agreement and the Plan. Shares issued upon exercise of an Option will be issued in the name of the Participant or, if requested by the Participant, in the
name of the Participant and his or her spouse. Until the Shares are issued (as evidenced by the appropriate entry on the books of the Company or of a duly authorized transfer agent of the Company), no right to vote or receive dividends or any other
rights as a stockholder will exist with respect to the Shares subject to an Option, notwithstanding the exercise of the Option. The Company will issue (or cause to be issued) such Shares promptly after the Option is exercised. No adjustment
will be made for a dividend or other right for which the record date is prior to the date the Shares are issued, except as provided in Section 14 of the Plan. 

Exercising an Option in any manner will decrease the number of Shares thereafter available, both for purposes of the Plan and for sale under
the Option, by the number of Shares as to which the Option is exercised. 
 (ii) Termination of Relationship as a Service Provider.
If a Participant ceases to be a Service Provider, other than upon the Participant’s termination as the result of the Participant’s death or Disability, the Participant may exercise his or her Option within such period of time as is
specified in the Award Agreement to the extent that the Option is vested on the date of termination (but in no event later than the expiration of the term of such Option as set forth in the Award Agreement). In the absence of a specified time in the
Award Agreement, the Option will remain exercisable for three (3) months following the Participant’s termination. Unless otherwise provided by the Administrator, if on the date of termination the Participant is not vested as to his or her
entire Option, the Shares covered by the unvested portion of the Option will revert to the Plan. If after termination the Participant does not exercise his or her Option within the time specified by the Administrator, the Option will terminate, and
the Shares covered by such Option will revert to the Plan. 
 (iii) Disability of Participant. If a Participant ceases to be a
Service Provider as a result of the Participant’s Disability, the Participant may exercise his or her Option within such period of time as is specified in the Award Agreement to the extent the Option is vested on the date of termination (but in
no event later than the expiration of the term of such Option as set forth in the Award Agreement). In the absence of a specified time in the Award Agreement, the Option will remain exercisable for twelve (12) months following the
Participant’s termination. Unless otherwise provided by the Administrator, if on the date of termination the Participant is not vested as to his or her entire Option, the Shares covered by the 

  
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unvested portion of the Option will revert to the Plan. If after termination the Participant does not exercise his or her Option within the time specified herein, the Option will terminate, and
the Shares covered by such Option will revert to the Plan. 
 (iv) Death of Participant. If a Participant dies while a Service
Provider, the Option may be exercised following the Participant’s death within such period of time as is specified in the Award Agreement to the extent that the Option is vested on the date of death (but in no event may the option be exercised
later than the expiration of the term of such Option as set forth in the Award Agreement), by the Participant’s designated beneficiary, provided such beneficiary has been designated prior to Participant’s death in a form acceptable to the
Administrator. If no such beneficiary has been designated by the Participant, then such Option may be exercised by the personal representative of the Participant’s estate or by the person(s) to whom the Option is transferred pursuant to
the Participant’s will or in accordance with the laws of descent and distribution. In the absence of a specified time in the Award Agreement, the Option will remain exercisable for twelve (12) months following Participant’s death.
Unless otherwise provided by the Administrator, if at the time of death Participant is not vested as to his or her entire Option, the Shares covered by the unvested portion of the Option will immediately revert to the Plan. If the Option is not so
exercised within the time specified herein, the Option will terminate, and the Shares covered by such Option will revert to the Plan. 
 7.
Restricted Stock. 
 (a) Grant of Restricted Stock. Subject to the terms and provisions of the Plan, the Administrator, at any
time and from time to time, may grant Shares of Restricted Stock to Service Providers in such amounts as the Administrator, in its sole discretion, will determine. 

(b) Restricted Stock Agreement. Each Award of Restricted Stock will be evidenced by an Award Agreement that will specify the Period of
Restriction, if any, the number of Shares granted, and such other terms and conditions as the Administrator, in its sole discretion, will determine. Unless the Administrator determines otherwise, the Company as escrow agent will hold Shares of
Restricted Stock until the restrictions on such Shares have lapsed. 
 (c) Transferability. Except as provided in this Section 7
or the Award Agreement, Shares of Restricted Stock may not be sold, transferred, pledged, assigned, or otherwise alienated or hypothecated until the end of the applicable Period of Restriction. 

(d) Other Restrictions. The Administrator, in its sole discretion, may impose such other restrictions on Shares of Restricted Stock as
it may deem advisable or appropriate. 
 (e) Removal of Restrictions. Except as otherwise provided in this Section 7, Shares of
Restricted Stock covered by each Restricted Stock grant made under the Plan will be released from escrow as soon as practicable after the last day of the Period of Restriction or at such other time as the Administrator may determine. The
Administrator, in its discretion, may accelerate the time at which any restrictions will lapse or be removed. 

  
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 (f) Voting Rights. During the Period of Restriction, Service Providers holding Shares of
Restricted Stock granted hereunder may exercise full voting rights with respect to those Shares, unless the Administrator determines otherwise. 

(g) Dividends and Other Distributions. During the Period of Restriction, Service Providers holding Shares of Restricted Stock will be
entitled to receive all dividends and other distributions paid with respect to such Shares, unless the Administrator provides otherwise. If any such dividends or distributions are paid in Shares, the Shares will be subject to the same restrictions
on transferability and forfeitability as the Shares of Restricted Stock with respect to which they were paid. 
 (h) Return of Restricted
Stock to Company. On the date set forth in the Award Agreement, the Restricted Stock for which restrictions have not lapsed will revert to the Company and again will become available for grant under the Plan. 

8. Restricted Stock Units. 

(a) Grant. Restricted Stock Units may be granted at any time and from time to time as determined by the Administrator. After the
Administrator determines that it will grant Restricted Stock Units under the Plan, it will advise the Participant in an Award Agreement of the terms, conditions, and restrictions related to the grant, including the number of Restricted Stock Units.

 (b) Vesting Criteria and Other Terms. The Administrator will set vesting criteria in its discretion, which, depending on the
extent to which the criteria are met, will determine the number of Restricted Stock Units that will be paid out to the Participant. The Administrator may set vesting criteria based upon the achievement of Company-wide, divisional, business unit, or
individual goals (including, but not limited to, continued employment or service), applicable federal or state securities laws or any other basis determined by the Administrator in its discretion. 

(c) Earning Restricted Stock Units. Upon meeting the applicable vesting criteria, the Participant will be entitled to receive a payout
as determined by the Administrator. Notwithstanding the foregoing, at any time after the grant of Restricted Stock Units, the Administrator, in its sole discretion, may reduce or waive any vesting criteria that must be met to receive a payout. 

(d) Form and Timing of Payment. Payment of earned Restricted Stock Units will be made as soon as practicable after the
date(s) determined by the Administrator and set forth in the Award Agreement. The Administrator, in its sole discretion, may only settle earned Restricted Stock Units in cash, Shares, or a combination of both. 

(e) Cancellation. On the date set forth in the Award Agreement, all unearned Restricted Stock Units will be forfeited to the Company.

  
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 9. Stock Appreciation Rights. 

(a) Grant of Stock Appreciation Rights. Subject to the terms and conditions of the Plan, a Stock Appreciation Right may be granted to
Service Providers at any time and from time to time as will be determined by the Administrator, in its sole discretion. 
 (b) Number of
Shares. The Administrator will have complete discretion to determine the number of Stock Appreciation Rights granted to any Service Provider. 

(c) Exercise Price and Other Terms. The per share exercise price for the Shares to be issued pursuant to exercise of a Stock
Appreciation Right will be determined by the Administrator and will be no less than one hundred percent (100%) of the Fair Market Value per Share on the date of grant. Otherwise, the Administrator, subject to the provisions of the Plan, will
have complete discretion to determine the terms and conditions of Stock Appreciation Rights granted under the Plan. 
 (d) Stock
Appreciation Right Agreement. Each Stock Appreciation Right grant will be evidenced by an Award Agreement that will specify the exercise price, the term of the Stock Appreciation Right, the conditions of exercise, and such other terms and
conditions as the Administrator, in its sole discretion, will determine. 
 (e) Expiration of Stock Appreciation Rights. A Stock
Appreciation Right granted under the Plan will expire ten (10) years from the date of grant or such shorter term as may be provided in the Award Agreement, as determined by the Administrator, in its sole discretion. Notwithstanding the
foregoing, the rules of Section 6(d) relating to exercise also will apply to Stock Appreciation Rights. 
 (f) Payment of Stock
Appreciation Right Amount. Upon exercise of a Stock Appreciation Right, a Participant will be entitled to receive payment from the Company in an amount determined by multiplying: 

(i) The difference between the Fair Market Value of a Share on the date of exercise over the exercise price; times 

(ii) The number of Shares with respect to which the Stock Appreciation Right is exercised. 

At the discretion of the Administrator, the payment upon Stock Appreciation Right exercise may be in cash, in Shares of equivalent value, or
in some combination thereof. 

  
 -13- 

 10. Performance Units and Performance Shares. 

(a) Grant of Performance Units/Shares. Performance Units and Performance Shares may be granted to Service Providers at any time and
from time to time, as will be determined by the Administrator, in its sole discretion. The Administrator will have complete discretion in determining the number of Performance Units and Performance Shares granted to each Participant. 

(b) Value of Performance Units/Shares. Each Performance Unit will have an initial value that is established by the Administrator on or
before the date of grant. Each Performance Share will have an initial value equal to the Fair Market Value of a Share on the date of grant. 

(c) Performance Objectives and Other Terms. The Administrator will set performance objectives or other vesting provisions (including,
without limitation, continued status as a Service Provider) in its discretion which, depending on the extent to which they are met, will determine the number or value of Performance Units/Shares that will be paid out to the Service Providers.
The time period during which the performance objectives or other vesting provisions must be met will be called the “Performance Period.” Each Award of Performance Units/Shares will be evidenced by an Award Agreement that will
specify the Performance Period, and such other terms and conditions as the Administrator, in its sole discretion, will determine. The Administrator may set performance objectives based upon the achievement of Company-wide, divisional, business unit
or individual goals (including, but not limited to, continued employment or service), applicable federal or state securities laws, or any other basis determined by the Administrator in its discretion. 

(d) Earning of Performance Units/Shares. After the applicable Performance Period has ended, the holder of Performance Units/Shares will
be entitled to receive a payout of the number of Performance Units/Shares earned by the Participant over the Performance Period, to be determined as a function of the extent to which the corresponding performance objectives or other vesting
provisions have been achieved. After the grant of a Performance Unit/Share, the Administrator, in its sole discretion, may reduce or waive any performance objectives or other vesting provisions for such Performance Unit/Share. 

(e) Form and Timing of Payment of Performance Units/Shares. Payment of earned Performance Units/Shares will be made as soon as
practicable after the expiration of the applicable Performance Period. The Administrator, in its sole discretion, may pay earned Performance Units/Shares in the form of cash, in Shares (which have an aggregate Fair Market Value equal to the value of
the earned Performance Units/Shares at the close of the applicable Performance Period) or in a combination thereof. 
 (f)
Cancellation of Performance Units/Shares. On the date set forth in the Award Agreement, all unearned or unvested Performance Units/Shares will be forfeited to the Company, and again will be available for grant under the Plan. 

11. Outside Director Limitations. Subject to the provisions of Section 14 of the Plan, no Outside Director may be granted, in any
Fiscal Year, Awards covering more than 175,000 

  
 -14- 

 
Shares, increased to 300,000 Shares in the Fiscal Year of his or her initial service as an Outside Director. 

12. Leaves of Absence/Transfer Between Locations. Unless the Administrator provides otherwise, vesting of Awards granted hereunder will
be suspended during any unpaid leave of absence. A Participant will not cease to be an Employee in the case of (i) any leave of absence approved by the Company or (ii) transfers between locations of the Company or between the Company, its
Parent, or any Subsidiary. For purposes of Incentive Stock Options, no such leave may exceed three (3) months, unless reemployment upon expiration of such leave is guaranteed by statute or contract. If reemployment upon expiration of a leave of
absence approved by the Company is not so guaranteed, then six (6) months following the first (1st) day of such leave any Incentive Stock Option held by the Participant will cease to be treated as an Incentive Stock Option and will be
treated for tax purposes as a Nonstatutory Stock Option. 
 13. Transferability of Awards. Unless determined otherwise by the
Administrator, an Award may not be sold, pledged, assigned, hypothecated, transferred, or disposed of in any manner other than by will or by the laws of descent or distribution and may be exercised, during the lifetime of the Participant, only by
the Participant. If the Administrator makes an Award transferable, such Award will contain such additional terms and conditions as the Administrator deems appropriate. 

14. Adjustments; Dissolution or Liquidation; Change in Control. 

(a) Adjustments. In the event that any dividend or other distribution (whether in the form of cash, Shares, other securities, or other
property), recapitalization, stock split, reverse stock split, reorganization, merger, consolidation, split-up, spin-off, combination, repurchase, or exchange of Shares or other securities of the Company, or other change in the corporate structure
of the Company affecting the Shares occurs, the Administrator, in order to prevent diminution or enlargement of the benefits or potential benefits intended to be made available under the Plan, will adjust the number and class of Shares that may be
delivered under the Plan and/or the number, class, and price of Shares covered by each outstanding Award, and the numerical Share limit in Section 3 of the Plan. 

(b) Dissolution or Liquidation. In the event of the proposed dissolution or liquidation of the Company, the Administrator will notify
each Participant as soon as practicable prior to the effective date of such proposed transaction. To the extent it previously has not been exercised, an Award will terminate immediately prior to the consummation of such proposed action. 

(c) Change in Control. In the event of a Change in Control, each outstanding Award will be treated as the Administrator determines,
including, without limitation, that (i) Awards may be assumed, or substantially equivalent Awards will be substituted, by the acquiring or succeeding corporation (or an affiliate thereof) with appropriate adjustments as to the number and kind
of shares and prices; (ii) upon written notice to a Participant, that the Participant’s Awards will terminate upon or immediately prior to the consummation of such Change in Control; (iii) outstanding Awards will vest and become
exercisable, realizable, or payable, or restrictions applicable to an Award will lapse, in whole or in part prior to or upon 

  
 -15- 

 
consummation of such Change in Control, and, to the extent the Administrator determines, terminate upon or immediately prior to the effectiveness of such merger or Change in Control;
(iv) (A) the termination of an Award in exchange for an amount of cash and/or property, if any, equal to the amount that would have been attained upon the exercise of such Award or realization of the Participant’s rights as of the
date of the occurrence of the transaction (and, for the avoidance of doubt, if as of the date of the occurrence of the transaction the Administrator determines in good faith that no amount would have been attained upon the exercise of such Award or
realization of the Participant’s rights, then such Award may be terminated by the Company without payment), or (B) the replacement of such Award with other rights or property selected by the Administrator in its sole discretion; or
(v) any combination of the foregoing. In taking any of the actions permitted under this Section 14(c), the Administrator will not be required to treat all Awards similarly in the transaction. 

In the event that the successor corporation does not assume or substitute for the Award, the Participant will fully vest in and have the right
to exercise all of his or her outstanding Options and Stock Appreciation Rights, including Shares as to which such Awards would not otherwise be vested or exercisable, all restrictions on Restricted Stock and Restricted Stock Units will lapse, and,
with respect to Awards with performance-based vesting, all performance goals or other vesting criteria will be deemed achieved at one hundred percent (100%) of target levels and all other terms and conditions met. In addition, if an Option or
Stock Appreciation Right is not assumed or substituted in the event of a Change in Control, the Administrator will notify the Participant in writing or electronically that the Option or Stock Appreciation Right will be exercisable for a period of
time determined by the Administrator in its sole discretion, and the Option or Stock Appreciation Right will terminate upon the expiration of such period. 

For the purposes of this subsection (c), an Award will be considered assumed if, following the Change in Control, the Award confers the right
to purchase or receive, for each Share subject to the Award immediately prior to the Change in Control, the consideration (whether stock, cash, or other securities or property) received in the Change in Control by holders of Common Stock for
each Share held on the effective date of the transaction (and if holders were offered a choice of consideration, the type of consideration chosen by the holders of a majority of the outstanding Shares); provided, however, that if such consideration
received in the Change in Control is not solely common stock of the successor corporation or its Parent, the Administrator may, with the consent of the successor corporation, provide for the consideration to be received upon the exercise of an
Option or Stock Appreciation Right or upon the payout of a Restricted Stock Unit, Performance Unit or Performance Share, for each Share subject to such Award, to be solely common stock of the successor corporation or its Parent equal in fair market
value to the per share consideration received by holders of Common Stock in the Change in Control. 
 Notwithstanding anything in this
Section 14(c) to the contrary, an Award that vests, is earned or paid-out upon the satisfaction of one or more performance goals will not be considered assumed if the Company or its successor modifies any of such performance goals without
the Participant’s consent; provided, however, a modification to such performance goals only to reflect the successor corporation’s post-Change in Control corporate structure will not be deemed to invalidate an otherwise valid Award
assumption. 

  
 -16- 

 (d) Outside Director Awards. With respect to Awards granted to an Outside Director, in the
event of a Change in Control, the Participant will fully vest in and have the right to exercise Options and/or Stock Appreciation Rights as to all of the Shares underlying such Award, including those Shares which otherwise would not be vested or
exercisable, all restrictions on Restricted Stock and Restricted Stock Units will lapse, and, with respect to Awards with performance-based vesting, all performance goals or other vesting criteria will be deemed achieved at one hundred percent
(100%) of target levels and all other terms and conditions met. 
 15. Tax. 

(a) Withholding Requirements. Prior to the delivery of any Shares or cash pursuant to an Award (or exercise thereof) or such
earlier time as any tax withholding obligations are due, the Company will have the power and the right to deduct or withhold, or require a Participant to remit to the Company, an amount sufficient to satisfy federal, state, local, foreign or other
taxes (including the Participant’s FICA obligation) required to be withheld with respect to such Award (or exercise thereof). 

(b) Withholding Arrangements. The Administrator, in its sole discretion and pursuant to such procedures as it may specify from time to
time, may permit a Participant to satisfy such tax withholding obligation, in whole or in part by (without limitation) (a) paying cash, (b) electing to have the Company withhold otherwise deliverable cash or Shares having a Fair
Market Value equal to the minimum statutory amount required to be withheld, or (c) delivering to the Company already-owned Shares having a Fair Market Value equal to the minimum statutory amount required to be withheld. The Fair Market Value of
the Shares to be withheld or delivered will be determined as of the date that the taxes are required to be withheld. 
 (c) Compliance
With Code Section 409A. Awards will be designed and operated in such a manner that they are either exempt from the application of, or comply with, the requirements of Code Section 409A such that the grant, payment, settlement or
deferral will not be subject to the additional tax or interest applicable under Code Section 409A, except as otherwise determined in the sole discretion of the Administrator. The Plan and each Award Agreement under the Plan is intended to meet
the requirements of Code Section 409A and will be construed and interpreted in accordance with such intent, except as otherwise determined in the sole discretion of the Administrator. To the extent that an Award or payment, or the
settlement or deferral thereof, is subject to Code Section 409A, the Award will be granted, paid, settled or deferred in a manner that will meet the requirements of Code Section 409A, such that the grant, payment, settlement or deferral
will not be subject to the additional tax or interest applicable under Code Section 409A. 
 16. No Effect on Employment or
Service. Neither the Plan nor any Award will confer upon a Participant any right with respect to continuing the Participant’s relationship as a Service Provider with the Company, nor will they interfere in any way with the
Participant’s right or the Company’s right to terminate such relationship at any time, with or without cause, to the extent permitted by Applicable Laws. 

  
 -17- 

 17. Date of Grant. The date of grant of an Award will be, for all purposes, the date on
which the Administrator makes the determination granting such Award, or such other later date as is determined by the Administrator. Notice of the determination will be provided to each Participant within a reasonable time after the date of such
grant. 
 18. Term of Plan. Subject to Section 22 of the Plan, the Plan will become effective upon the later to occur of
(i) its adoption by the Board or (ii) the business day immediately prior to the Registration Date. It will continue in effect for a term of ten (10) years from the date adopted by the Board, unless terminated earlier under
Section 19 of the Plan. 
 19. Amendment and Termination of the Plan. 

(a) Amendment and Termination. The Administrator may at any time amend, alter, suspend or terminate the Plan. 

(b) Stockholder Approval. The Company will obtain stockholder approval of any Plan amendment to the extent necessary and desirable to
comply with Applicable Laws. 
 (c) Effect of Amendment or Termination. No amendment, alteration, suspension or termination of the
Plan will materially impair the rights of any Participant, unless mutually agreed otherwise between the Participant and the Administrator, which agreement must be in writing and signed by the Participant and the Company. Termination of the Plan will
not affect the Administrator’s ability to exercise the powers granted to it hereunder with respect to Awards granted under the Plan prior to the date of such termination. 

20. Conditions Upon Issuance of Shares. 

(a) Legal Compliance. Shares will not be issued pursuant to the exercise of an Award unless the exercise of such Award and the issuance
and delivery of such Shares will comply with Applicable Laws and will be further subject to the approval of counsel for the Company with respect to such compliance. 

(b) Investment Representations. As a condition to the exercise of an Award, the Company may require the person exercising such Award to
represent and warrant at the time of any such exercise that the Shares are being purchased only for investment and without any present intention to sell or distribute such Shares if, in the opinion of counsel for the Company, such a representation
is required. 
 21. Inability to Obtain Authority. The inability of the Company to obtain authority from any regulatory body having
jurisdiction or to complete or comply with the requirements of any registration or other qualification of the Shares under any state, federal or foreign law or under the rules and regulations of the Securities and Exchange Commission, the stock
exchange on which Shares of the same class are then listed, or any other governmental or regulatory body, which authority, registration, qualification or rule compliance is deemed by the Company’s counsel to be necessary or advisable for the
issuance and sale of any Shares hereunder, will relieve the Company of any liability in respect of the failure to issue or sell such Shares as to which such requisite authority, registration, qualification or rule compliance will not have been
obtained. 

  
 -18- 

 22. Stockholder Approval. The Plan will be subject to approval by the stockholders of the
Company within twelve (12) months after the date the Plan is adopted by the Board. Such stockholder approval will be obtained in the manner and to the degree required under Applicable Laws. 

  
 -19- 

 NANTKWEST, INC. 

2015 EQUITY INCENTIVE PLAN 

STOCK OPTION AGREEMENT 

NOTICE OF STOCK OPTION GRANT 

Unless otherwise defined herein, the terms defined in the NantKwest, Inc. 2015 Equity Incentive Plan (the “Plan”) will have the same
defined meanings in this Stock Option Agreement including the Notice of Stock Option Grant (the “Notice of Grant”), the Terms and Conditions of Stock Option Grant, and the appendices and exhibits attached thereto (all together, the
“Award Agreement”). 
  

			
	Name (“Participant”):	  	«Name»
		
	Address:	  	«Address»
		  	«CityStateZip»

 The undersigned Participant has been granted an Option to purchase Common Stock of NantKwest, Inc. (the
“Company”), subject to the terms and conditions of the Plan and this Award Agreement, as follows: 
  

			
	Date of Grant	  	«GrantDate»
		
	Vesting Commencement Date	  	«VCD»
		
	Number of Shares Granted	  	«Shares»
		
	Exercise Price per Share	  	$«Purchase_Price»
		
	Total Exercise Price	  	$«Purchase_Price»
		
	Type of Option	  	       Incentive Stock Option
		
		  	       Nonstatutory Stock Option
		
	Term/Expiration Date	  	«GrantDate»
		
	Vesting Schedule:	  	

 Subject to accelerated vesting as set forth below or in the Plan, this Option will be exercisable, in
whole or in part, in accordance with the following schedule: 

  
 - 1 - 

 Termination Period: 

This Option will be exercisable for three (3) months after Participant ceases to be a Service Provider, unless such termination is due to
Participant’s death or Disability, in which case this Option will be exercisable for twelve (12) months after Participant ceases to be a Service Provider. Notwithstanding the foregoing sentence, in no event may this Option be exercised
after the Term/Expiration Date as provided above and may be subject to earlier termination as provided in Section 14 of the Plan. 

Participant acknowledges receipt of a copy of the Plan and represents that he or she is familiar with the terms and provisions thereof, and
hereby accepts this Award Agreement subject to all of the terms and provisions thereof. Participant has reviewed the Plan and this Award Agreement in their entirety, has had an opportunity to obtain the advice of counsel prior to executing this
Award Agreement and fully understands all provisions of this Award Agreement. Participant hereby agrees to accept as binding, conclusive and final all decisions or interpretations of the Administrator upon any questions arising under the Plan or
this Award Agreement. Participant further agrees to notify the Company upon any change in the residence address indicated below. 
  

					
	PARTICIPANT	 		 	NANTKWEST, INC.
			
	  
	 		 	  

	Signature	 		 	By
			
	 «Name»
	 		 	  

			
	  
	 		 	  

	Print Name	 		 	Print Name
			
	  
	 		 	  

	Title	 		 	
			
	Address:	 		 	
			
	 «Address»
	 		 	
			
	 «CityStateZip»
	 		 	

  
 - 2 - 

 NANTKWEST, INC. 

2015 EQUITY INCENTIVE PLAN 

STOCK OPTION AGREEMENT 

TERMS AND CONDITIONS OF STOCK OPTION GRANT 

1. Grant of Option. The Company hereby grants to the individual (the “Participant”) named in the Notice of Stock Option Grant
of this Award Agreement (the “Notice of Grant”) an option (the “Option”) to purchase the number of Shares, as set forth in the Notice of Grant, at the exercise price per Share set forth in the Notice of Grant (the “Exercise
Price”), subject to all of the terms and conditions in this Award Agreement and the Plan, which is incorporated herein by reference. Subject to Section 19(c) of the Plan, in the event of a conflict between the terms and conditions of the
Plan and the terms and conditions of this Award Agreement, the terms and conditions of the Plan will prevail. 
 (a) For U.S. taxpayers, the
Option will be designated as either an Incentive Stock Option (“ISO”) or a Nonstatutory Stock Option (“NSO”). If designated in the Notice of Grant as an ISO, this Option is intended to qualify as an ISO under Section 422 of
the Internal Revenue Code of 1986, as amended (the “Code”). However, if this Option is intended to be an Incentive Stock Option, to the extent that it exceeds the $100,000 rule of Code Section 422(d) it will be treated as an NSO.
Further, if for any reason this Option (or portion thereof) will not qualify as an ISO, then, to the extent of such nonqualification, such Option (or portion thereof) shall be regarded as a NSO granted under the Plan. In no event will the
Administrator, the Company or any Parent or Subsidiary or any of their respective employees or directors have any liability to Participant (or any other person) due to the failure of the Option to qualify for any reason as an ISO. 

(b) For non-U.S. taxpayers, the Option will be designated as an NSO. 

2. Vesting Schedule. Except as provided in Section 3, the Option awarded by this Award Agreement will vest in accordance with the
vesting provisions set forth in the Notice of Grant. Shares scheduled to vest on a certain date or upon the occurrence of a certain condition will not vest in Participant in accordance with any of the provisions of this Award Agreement, unless
Participant will have been continuously a Service Provider from the Date of Grant until the date such vesting occurs. 
 3. Administrator
Discretion. The Administrator, in its discretion, may accelerate the vesting of the balance, or some lesser portion of the balance, of the unvested Option at any time, subject to the terms of the Plan. If so accelerated, such Option will be
considered as having vested as of the date specified by the Administrator. 
 4. Exercise of Option. 

  
 - 1 - 

 (a) Right to Exercise. This Option may be exercised only within the term set out in the
Notice of Grant, and may be exercised during such term only in accordance with the Plan and the terms of this Award Agreement. 
 (b)
Method of Exercise. This Option is exercisable by delivery of an exercise notice (the “Exercise Notice”) in the form attached as Exhibit A or in a manner and pursuant to such procedures as the Administrator may determine,
which will state the election to exercise the Option, the number of Shares in respect of which the Option is being exercised (the “Exercised Shares”), and such other representations and agreements as may be required by the Company pursuant
to the provisions of the Plan. The Exercise Notice will be completed by Participant and delivered to the Company. The Exercise Notice will be accompanied by payment of the aggregate Exercise Price as to all Exercised Shares together and of any Tax
Obligations (as defined in Section 6(a)). This Option will be deemed to be exercised upon receipt by the Company of such fully executed Exercise Notice accompanied by the aggregate Exercise Price. 

5. Method of Payment. Payment of the aggregate Exercise Price will be by any of the following, or a combination thereof, at the
election of Participant: 
 (a) cash; 

(b) check; 
 (c) consideration
received by the Company under a formal cashless exercise program adopted by the Company in connection with the Plan; or 
 (d) if
Participant is a U.S. employee, surrender of other Shares which have a Fair Market Value on the date of surrender equal to the aggregate Exercise Price of the Exercised Shares, provided that accepting such Shares, in the sole discretion of the
Administrator, will not result in any adverse accounting consequences to the Company. 
 6. Tax Obligations. 

(a) Participant acknowledges that, regardless of any action taken by the Company or, if different, Participant’s employer (the
“Employer”), the ultimate liability for any tax and/or social insurance liability obligations and requirements in connection with the Option, including, without limitation, (a) all federal, state, and local taxes (including the
Participant’s Federal Insurance Contributions Act (FICA) obligation) that are required to be withheld by the Company or the Employer or other payment of tax-related items related to Participant’s participation in the Plan and legally
applicable to Participant, (b) the Participant’s and, to the extent required by the Company (or Employer), the Company’s (or Employer’s) fringe benefit tax liability, if any, associated with the grant, vesting, or exercise of the
Option or sale of Shares, and (c) any other Company (or Employer) taxes the responsibility for which the Participant has, or has agreed to bear, with respect to the Option (or exercise thereof or issuance of Shares thereunder) (collectively,
the “Tax Obligations”), is and remains Participant’s responsibility and may exceed the amount actually withheld by the Company or the Employer. Participant further acknowledges that the Company and/or the Employer (i) make no
representations or undertakings regarding the treatment of any Tax Obligations in 

  
 - 2 - 

 
connection with any aspect of the Option, including, but not limited to, the grant, vesting or exercise of the Option, the subsequent sale of Shares acquired pursuant to such exercise and the
receipt of any dividends or other distributions, and (ii) do not commit to and are under no obligation to structure the terms of the grant or any aspect of the Option to reduce or eliminate Participant’s liability for Tax Obligations or
achieve any particular tax result. Further, if Participant is subject to Tax Obligations in more than one jurisdiction between the Date of Grant and the date of any relevant taxable or tax withholding event, as applicable, Participant acknowledges
that the Company and/or the Employer (or former employer, as applicable) may be required to withhold or account for Tax Obligations in more than one jurisdiction. If Participant fails to make satisfactory arrangements for the payment of any required
Tax Obligations hereunder at the time of the applicable taxable event, Participant acknowledges and agrees that the Company may refuse to issue or deliver the Shares. 

(b) Tax Withholding. When the Option is exercised, Participant generally will recognize immediate U.S. taxable income if Participant is
a U.S. taxpayer. If Participant is a non-U.S. taxpayer, Participant will be subject to applicable taxes in his or her jurisdiction. Pursuant to such procedures as the Administrator may specify from time to time, the Company and/or Employer shall
withhold the minimum amount required to be withheld for the payment of Tax Obligations. The Administrator, in its sole discretion and pursuant to such procedures as it may specify from time to time, may permit Participant to satisfy such Tax
Obligations, in whole or in part (without limitation), if permissible by applicable local law, by (a) paying cash, (b) electing to have the Company withhold otherwise deliverable Shares having a Fair Market Value equal to the amount of
such Tax Obligations, (c) withholding the amount of such Tax Obligations from Participant’s wages or other cash compensation paid to Participant by the company and/or the Employer, (d) delivering to the Company already vested and
owned Shares having a Fair Market Value equal to such Tax Obligations, or (e) selling a sufficient number of such Shares otherwise deliverable to Participant through such means as the Company may determine in its sole discretion (whether
through a broker or otherwise) equal to the amount of the Tax Obligations. To the extent determined appropriate by the Company in its discretion, it will have the right (but not the obligation) to satisfy any Tax Obligations by reducing the number
of Shares otherwise deliverable to Participant. Further, if Participant is subject to tax in more than one jurisdiction between the Date of Grant and a date of any relevant taxable or tax withholding event, as applicable, Participant acknowledges
and agrees that the Company and/or the Employer (and/or former employer, as applicable) may be required to withhold or account for tax in more than one jurisdiction. If Participant fails to make satisfactory arrangements for the payment of any
required Tax Obligations hereunder at the time of the Option exercise, Participant acknowledges and agrees that the Company may refuse to honor the exercise and refuse to deliver the Shares if such amounts are not delivered at the time of exercise.

 (c) Notice of Disqualifying Disposition of ISO Shares. If the Option granted to Participant herein is an ISO, and if Participant
sells or otherwise disposes of any of the Shares acquired pursuant to the ISO on or before the later of (i) the date two (2) years after the Date of Grant, or (ii) the date one (1) year after the date of exercise, Participant
will immediately notify the Company in writing of such disposition. Participant agrees that Participant may be subject to income tax withholding by the Company on the compensation income recognized by Participant. 

(d) Code Section 409A. Under Code Section 409A, an option that vests after December 31, 2004 (or that vested on or prior
to such date but which was materially modified after October 3, 

  
 - 3 - 

 
2004) that was granted with a per share exercise price that is determined by the Internal Revenue Service (the “IRS”) to be less than the fair market value of a share on the date of
grant (a “Discount Option”) may be considered “deferred compensation.” A Discount Option may result in (i) income recognition by Participant prior to the exercise of the option, (ii) an additional twenty percent
(20%) federal income tax, and (iii) potential penalty and interest charges. The Discount Option may also result in additional state income, penalty and interest charges to Participant. Participant acknowledges that the Company cannot and
has not guaranteed that the IRS will agree that the per Share Exercise Price of this Option equals or exceeds the Fair Market Value of a Share on the Date of Grant in a later examination. Participant agrees that if the IRS determines that the Option
was granted with a per Share Exercise Price that was less than the Fair Market Value of a Share on the Date of Grant, Participant will be solely responsible for Participant’s costs related to such a determination. 

7. Rights as Stockholder. Neither Participant nor any person claiming under or through Participant will have any of the rights or
privileges of a stockholder of the Company in respect of any Shares deliverable hereunder unless and until certificates representing such Shares (which may be in book entry form) will have been issued, recorded on the records of the Company or its
transfer agents or registrars, and delivered to Participant (including through electronic delivery to a brokerage account). After such issuance, recordation and delivery, Participant will have all the rights of a stockholder of the Company with
respect to voting such Shares and receipt of dividends and distributions on such Shares. 
 8. No Guarantee of Continued Service.
PARTICIPANT ACKNOWLEDGES AND AGREES THAT THE VESTING OF SHARES PURSUANT TO THE VESTING SCHEDULE HEREOF IS EARNED ONLY BY CONTINUING AS A SERVICE PROVIDER AT THE WILL OF THE COMPANY (OR THE EMPLOYER) AND NOT THROUGH THE ACT OF BEING HIRED, BEING
GRANTED THIS OPTION OR ACQUIRING SHARES HEREUNDER. PARTICIPANT FURTHER ACKNOWLEDGES AND AGREES THAT THIS AWARD AGREEMENT, THE TRANSACTIONS CONTEMPLATED HEREUNDER AND THE VESTING SCHEDULE SET FORTH HEREIN DO NOT CONSTITUTE AN EXPRESS OR IMPLIED
PROMISE OF CONTINUED ENGAGEMENT AS A SERVICE PROVIDER FOR THE VESTING PERIOD, FOR ANY PERIOD, OR AT ALL, AND WILL NOT INTERFERE IN ANY WAY WITH PARTICIPANT’S RIGHT OR THE RIGHT OF THE COMPANY (OR THE EMPLOYER) TO TERMINATE PARTICIPANT’S
RELATIONSHIP AS A SERVICE PROVIDER AT ANY TIME, WITH OR WITHOUT CAUSE. 
 9. Nature of Grant. In accepting the Option, Participant
acknowledges, understands and agrees that: 
 (a) the grant of the Option is voluntary and occasional and does not create any contractual or
other right to receive future grants of options, or benefits in lieu of options, even if options have been granted in the past; 
 (b) all
decisions with respect to future option or other grants, if any, will be at the sole discretion of the Company; 

  
 - 4 - 

 (c) Participant is voluntarily participating in the Plan; 

(d) the Option and any Shares acquired under the Plan are not intended to replace any pension rights or compensation; 

(e) the Option and Shares acquired under the Plan and the income and value of same, are not part of normal or expected compensation for
purposes of calculating any severance, resignation, termination, redundancy, dismissal, end-of-service payments, bonuses, long-service awards, pension or retirement or welfare benefits or similar payments; 

(f) the future value of the Shares underlying the Option is unknown, indeterminable, and cannot be predicted with certainty; 

(g) if the underlying Shares do not increase in value, the Option will have no value; 

(h) if Participant exercises the Option and acquires Shares, the value of such Shares may increase or decrease in value, even below the
Exercise Price; 
 (i) for purposes of the Option, Participant’s engagement as a Service Provider will be considered terminated as of
the date Participant is no longer actively providing services to the Company or any Parent or Subsidiary (regardless of the reason for such termination and whether or not later found to be invalid or in breach of employment laws in the jurisdiction
where Participant is a Service Provider or the terms of Participant’s employment or service agreement, if any), and unless otherwise expressly provided in this Award Agreement (including by reference in the Notice of Grant to other arrangements
or contracts) or determined by the Administrator, (i) Participant’s right to vest in the Option under the Plan, if any, will terminate as of such date and will not be extended by any notice period (e.g., Participant’s period of
service would not include any contractual notice period or any period of “garden leave” or similar period mandated under employment laws in the jurisdiction where Participant is a Service Provider or Participant’s employment or
service agreement, if any, unless Participant is providing bona fide services during such time); and (ii) the period (if any) during which Participant may exercise the Option after such termination of Participant’s engagement as a Service
Provider will commence on the date Participant ceases to actively provide services and will not be extended by any notice period mandated under employment laws in the jurisdiction where Participant is employed or terms of Participant’s
engagement agreement, if any; the Administrator shall have the exclusive discretion to determine when Participant is no longer actively providing services for purposes of his or her Option grant (including whether Participant may still be considered
to be providing services while on a leave of absence); 
 (j) unless otherwise provided in the Plan or by the Company in its discretion, the
Option and the benefits evidenced by this Award Agreement do not create any entitlement to have the Option or any such benefits transferred to, or assumed by, another company nor to be exchanged, cashed out or substituted for, in connection with any
corporate transaction affecting the Shares; and 
 (k) the following provisions apply only if Participant is providing services outside the
United States: 

  
 - 5 - 

	 	(i)	the Option and the Shares subject to the Option are not part of normal or expected compensation or salary for any purpose; 

  

	 	(ii)	Participant acknowledges and agrees that none of the Company, the Employer, or any Parent or Subsidiary shall be liable for any foreign exchange rate fluctuation between Participant’s local currency and the United
States Dollar that may affect the value of the Option or of any amounts due to Participant pursuant to the exercise of the Option or the subsequent sale of any Shares acquired upon exercise; and 

 

	 	(iii)	no claim or entitlement to compensation or damages shall arise from forfeiture of the Option resulting from the termination of Participant’s engagement as a Service Provider (for any reason whatsoever, whether or
not later found to be invalid or in breach of employment laws in the jurisdiction where Participant is a Service Provider or the terms of Participant’s employment or service agreement, if any), and in consideration of the grant of the Option to
which Participant is otherwise not entitled, Participant irrevocably agrees never to institute any claim against the Company, any Parent, any Subsidiary or the Employer, waives his or her ability, if any, to bring any such claim, and releases the
Company, any Parent or Subsidiary and the Employer from any such claim; if, notwithstanding the foregoing, any such claim is allowed by a court of competent jurisdiction, then, by participating in the Plan, Participant shall be deemed irrevocably to
have agreed not to pursue such claim and agrees to execute any and all documents necessary to request dismissal or withdrawal of such claim. 

10. No Advice Regarding Grant. The Company is not providing any tax, legal or financial advice, nor is the Company making any
recommendations regarding Participant’s participation in the Plan, or Participant’s acquisition or sale of the underlying Shares. Participant is hereby advised to consult with his or her own personal tax, legal and financial advisors
regarding his or her participation in the Plan before taking any action related to the Plan. 
 11. Data
Privacy. Participant hereby explicitly and unambiguously consents to the collection, use and transfer, in electronic or other form, of Participant’s personal data as described in this Award Agreement and any other Option grant
materials by and among, as applicable, the Employer, the Company and any Parent or Subsidiary for the exclusive purpose of implementing, administering and managing Participant’s participation in the Plan. 

Participant understands that the Company and the Employer may hold certain personal information about Participant, including, but not
limited to, Participant’s name, home address and telephone number, date of birth, social insurance number or other identification number, salary, nationality, job title, any Shares or directorships held in the Company, details of all Options or
any other entitlement to Shares awarded, canceled, exercised, vested, unvested or outstanding in Participant’s favor (“Data”),  for the exclusive purpose of implementing, administering and managing the Plan. 

  
 - 6 - 

 Participant understands that Data will be transferred to a stock plan service provider as
may be selected by the Company in the  future, which is assisting the Company with the implementation, administration and management of the Plan. Participant understands that the recipients of the Data may be located in the United States or
elsewhere, and that the recipient’s country of operation (e.g., the United States) may have different data privacy laws and protections than Participant’s country. Participant understands that if he or she resides outside the United
States, he or she may request a list with the names and addresses of any  potential recipients of the Data by contacting his or her local human resources representative. Participant authorizes the Company and any other possible recipients which
may assist the Company (presently or in the future) with implementing, administering and managing the Plan to receive, possess, use, retain and transfer the Data, in electronic or other form, for the sole purposes of implementing, administering and
managing Participant’s participation in the Plan. Participant understands that Data will be held only as long as is necessary to implement, administer and manage Participant’s participation in the Plan. Participant understands that if he
or she resides outside the United States, he or she may, at any time, view Data, request additional information about the storage and processing of Data, require any necessary amendments to Data or refuse or withdraw the consents herein, in any case
without cost, by contacting in writing his or her local human resources representative. Further, Participant understands that he or she is providing the consents herein on a purely voluntary basis. If Participant does not consent, or if Participant
later seeks to revoke his or her consent, his or her engagement as a Service Provider and career with the Employer will not be adversely affected; the only adverse consequence of refusing or withdrawing Participant’s consent is that the Company
would not be able to grant Participant Options or other equity awards or administer or maintain such awards. Therefore, Participant understands that refusing or withdrawing his or her consent may affect Participant’s ability to participate in
the Plan. For more information on the consequences of Participant’s refusal to consent or withdrawal of consent, Participant understands that he or she may contact his or her local human resources representative. 

12. Address for Notices. Any notice to be given to the Company under the terms of this Award Agreement will be addressed to the Company
at NantKwest, Inc., 2533 South Coast Highway 101, Suite 210, Cardiff-by-the-Sea, CA 92007, or at such other address as the Company may hereafter designate in writing. 

13. Non-Transferability of Option. This Option may not be transferred in any manner otherwise than by will or by the laws of descent or
distribution and may be exercised during the lifetime of Participant only by Participant. 
 14. Successors and Assigns. The Company
may assign any of its rights under this Award Agreement to single or multiple assignees, and this Award Agreement shall inure to the benefit of the successors and assigns of the Company. Subject to the restrictions on transfer herein set forth, this
Award Agreement shall be binding upon Participant and his or her heirs, executors, administrators, successors and assigns. The rights and obligations of Participant under this Award Agreement may only be assigned with the prior written consent of
the Company. 
 15. Additional Conditions to Issuance of Stock. If at any time the Company will determine, in its discretion, that
the listing, registration, qualification or rule compliance of the Shares upon any 

  
 - 7 - 

 
securities exchange or under any state, federal or foreign law, the tax code and related regulations or under the rulings or regulations of the United States Securities and Exchange Commission or
any other governmental regulatory body or the clearance, consent or approval of the United States Securities and Exchange Commission or any other governmental regulatory authority is necessary or desirable as a condition to the purchase by, or
issuance of Shares, to Participant (or his or her estate) hereunder, such purchase or issuance will not occur unless and until such listing, registration, qualification, rule compliance, clearance, consent or approval will have been completed,
effected or obtained free of any conditions not acceptable to the Company. Subject to the terms of the Award Agreement and the Plan, the Company shall not be required to issue any certificate or certificates for Shares hereunder prior to the lapse
of such reasonable period of time following the date of exercise of the Option as the Administrator may establish from time to time for reasons of administrative convenience. 

16. Language. If Participant has received this Award Agreement or any other document related to the Plan translated into a language
other than English and if the meaning of the translated version is different than the English version, the English version will control. 

17. Interpretation. The Administrator will have the power to interpret the Plan and this Award Agreement and to adopt such rules for
the administration, interpretation and application of the Plan as are consistent therewith and to interpret or revoke any such rules (including, but not limited to, the determination of whether or not any Shares subject to the Option have vested).
All actions taken and all interpretations and determinations made by the Administrator in good faith will be final and binding upon Participant, the Company and all other interested persons. Neither the Administrator nor any person acting on behalf
of the Administrator will be personally liable for any action, determination or interpretation made in good faith with respect to the Plan or this Award Agreement. 

18. Electronic Delivery and Acceptance. The Company may, in its sole discretion, decide to deliver any documents related to Options
awarded under the Plan or future options that may be awarded under the Plan by electronic means or request Participant’s consent to participate in the Plan by electronic means. Participant hereby consents to receive such documents by electronic
delivery and agrees to participate in the Plan through any on-line or electronic system established and maintained by the Company or a third party designated by the Company. 

19. Captions. Captions provided herein are for convenience only and are not to serve as a basis for interpretation or construction of
this Award Agreement. 
 20. Agreement Severable. In the event that any provision in this Award Agreement will be held invalid or
unenforceable, such provision will be severable from, and such invalidity or unenforceability will not be construed to have any effect on, the remaining provisions of this Award Agreement. 

21. Amendment, Suspension or Termination of the Plan. By accepting this Award, Participant expressly warrants that he or she has
received an Option under the Plan, and has received, read and understood a description of the Plan. Participant understands that the Plan is discretionary in nature and may be amended, suspended or terminated by the Company at any time. 

  
 - 8 - 

 22. Governing Law and Venue. This Award Agreement will be governed by the laws of
California, without giving effect to the conflict of law principles thereof. For purposes of litigating any dispute that arises under this Option or this Award Agreement, the parties hereby submit to and consent to the jurisdiction of the State of
California, and agree that such litigation will be conducted in the courts of Los Angeles, California, or the federal courts for the United States for the Central District of California, and no other courts, where this Option is made and/or
to be performed. 
 23. Country Addendum. Notwithstanding any provisions in this Award Agreement, this Option shall be subject to any
special terms and conditions set forth in any appendix to this Award Agreement for Participant’s country (the “Country Addendum”). Moreover, if Participant relocates to one of the countries included in the Country Addendum, the
special terms and conditions for such country will apply to Participant, to the extent the Company determines that the application of such terms and conditions is necessary or advisable for legal or administrative reasons. The Country Addendum
constitutes part of this Award Agreement. 
 24. Modifications to the Agreement. This Award Agreement constitutes the entire
understanding of the parties on the subjects covered. Participant expressly warrants that he or she is not accepting this Award Agreement in reliance on any promises, representations, or inducements other than those contained herein. Modifications
to this Award Agreement or the Plan can be made only in an express written contract executed by a duly authorized officer of the Company. Notwithstanding anything to the contrary in the Plan or this Award Agreement, the Company reserves the right to
revise this Award Agreement as it deems necessary or advisable, in its sole discretion and without the consent of Participant, to comply with Code Section 409A or to otherwise avoid imposition of any additional tax or income recognition under
Section 409A of the Code in connection with the Option. 
 25. No Waiver. Either party’s failure to enforce any provision
or provisions of this Award Agreement shall not in any way be construed as a waiver of any such provision or provisions, nor prevent that party from thereafter enforcing each and every other provision of this Award Agreement. The rights granted both
parties herein are cumulative and shall not constitute a waiver of either party’s right to assert all other legal remedies available to it under the circumstances. 

26. Tax Consequences. Participant has reviewed with its own tax advisors the U.S. federal, state, local and foreign tax consequences of
this investment and the transactions contemplated by this Award Agreement. With respect to such matters, Participant relies solely on such advisors and not on any statements or representations of the Company or any of its agents, written or oral.
Participant understands that Participant (and not the Company) shall be responsible for Participant’s own tax liability that may arise as a result of this investment or the transactions contemplated by this Award Agreement. 

  
 - 9 - 

 NANTKWEST, INC. 

2015 EQUITY INCENTIVE PLAN 

STOCK OPTION AGREEMENT 

COUNTRY ADDENDUM 
 TERMS AND
CONDITIONS 
 This Country Addendum includes additional terms and conditions that govern the Option granted to Participant under the Plan if
Participant works in one of the countries listed below. If Participant is a citizen or resident of a country (or is considered as such for local law purposes) other than the one in which he or she is currently working or if Participant relocates to
another country after receiving the Option, the Company will, in its discretion, determine the extent to which the terms and conditions contained herein will be applicable to Participant. 

Certain capitalized terms used but not defined in this Country Addendum shall have the meanings set forth in the Plan, the and/or the Award Agreement to which
this Country Addendum is attached. 
 NOTIFICATIONS 

This Country Addendum also includes notifications relating to exchange control and other issues of which Participant should be aware with respect to his or her
participation in the Plan. The information is based on the exchange control, securities and other laws in effect in the countries listed in this Country Addendum, as of [DATE]. Such laws are often complex and change frequently. As a result, the
Company strongly recommends that Participant not rely on the notifications herein as the only source of information relating to the consequences of his or her participation in the Plan because the information may be outdated when Participant
exercises the Option or sells Shares acquired under the Plan. 
 In addition, the notifications are general in nature and may not apply to
Participant’s particular situation, and the Company is not in a position to assure Participant of any particular result. Accordingly, Participant is advised to seek appropriate professional advice as to how the relevant laws in
Participant’s country may apply to Participant’s situation. 
 Finally, if Participant is a citizen or resident of a country other than the one in
which Participant is currently working (or is considered as such for local law purposes) or if Participant moves to another country after the Option is granted, the information contained herein may not be applicable to Participant. 

  
 - 1 - 

 EXHIBIT A 

NANTKWEST, INC. 
 2015
EQUITY INCENTIVE PLAN 
 EXERCISE NOTICE 

NantKwest, Inc. 
 2533 South Coast Highway 101, Suite 210 

Cardiff-by-the-Sea, CA 92007 
 Attention: Stock Administration

 1. Exercise of Option. Effective as of today,             ,
        , the undersigned (“Purchaser”) hereby elects to purchase                  shares (the “Shares”) of
the Common Stock of NantKwest, Inc. (the “Company”) under and pursuant to the 2015 Equity Incentive Plan (the “Plan”) and the Stock Option Agreement, dated
                     and including the Notice of Grant, the Terms and Conditions of Stock Option Grant, and appendices and exhibits attached thereto
(the “Award Agreement”). The purchase price for the Shares will be $        , as required by the Award Agreement. 

2. Delivery of Payment. Purchaser herewith delivers to the Company the full purchase price of the Shares and any Tax Obligations (as
defined in Section 7(a) of the Award Agreement) to be paid in connection with the exercise of the Option. 
 3. Representations of
Purchaser. Purchaser acknowledges that Purchaser has received, read and understood the Plan and the Award Agreement and agrees to abide by and be bound by their terms and conditions. 

4. Rights as Stockholder. Until the issuance (as evidenced by the appropriate entry on the books of the Company or of a duly authorized
transfer agent of the Company) of the Shares, no right to vote or receive dividends or any other rights as a stockholder will exist with respect to the Shares subject to the Option, notwithstanding the exercise of the Option. The Shares so acquired
will be issued to Purchaser as soon as practicable after exercise of the Option. No adjustment will be made for a dividend or other right for which the record date is prior to the date of issuance, except as provided in Section 14 of the Plan.

 5. Tax Consultation. Purchaser understands that Purchaser may suffer adverse tax consequences as a result of Purchaser’s
purchase or disposition of the Shares. Purchaser represents that Purchaser has consulted with any tax consultants Purchaser deems advisable in connection with the purchase or disposition of the Shares and that Purchaser is not relying on the Company
for any tax advice. 
 6. Entire Agreement; Governing Law. The Plan and Award Agreement are incorporated herein by reference. This
Exercise Notice, the Plan and the Award Agreement constitute the entire agreement of the parties with respect to the subject matter hereof and 

  
 - 2 - 

 
supersede in their entirety all prior undertakings and agreements of the Company and Purchaser with respect to the subject matter hereof, and may not be modified adversely to the Purchaser’s
interest except by means of a writing signed by the Company and Purchaser. This agreement is governed by the internal substantive laws, but not the choice of law rules, of California. 

 

					
	Submitted by:	 		 	Accepted by:
			
	PURCHASER	 		 	NANTKWEST, INC.
			
	  
	 		 	  

	Signature	 		 	By
			
	  
	 		 	  

	Print Name	 		 	Its
			
	Address:	 		 	
			
	  
	 		 	
			
	  
	 		 	
			
		 		 	  

		 		 	 Date Received

  
 - 3 - 

 NANTKWEST, INC. 

2015 EQUITY INCENTIVE PLAN 

RESTRICTED STOCK UNIT AWARD AGREEMENT 

NOTICE OF GRANT OF RESTRICTED STOCK UNITS 

Unless otherwise defined herein, the terms defined in the 2015 Equity Incentive Plan (the “Plan”) shall have the same defined
meanings in this Restricted Stock Unit Award Agreement, including the Notice of Grant of Restricted Stock Units (the “Notice of Grant”), the Terms and Conditions of Restricted Stock Unit Grant, and any appendices and exhibits attached
thereto (all together, the “Award Agreement”). 
  

			
	Name (“Participant):	  	«Name»
	Address:	  	«Address»

 The undersigned Participant has been granted the right to receive an Award of Restricted Stock Units, subject
to the terms and conditions of the Plan and this Award Agreement, as follows: 
  

			
	Date of Grant:	  	«GrantDate»
		
	Vesting Commencement Date:	  	«VCD»
		
	Number of Restricted Stock Units:	  	«Shares»

 Vesting Schedule: 

Subject to any acceleration provisions contained in the Plan or set forth below, the Restricted Stock Units will vest in accordance with the
following schedule: 
 In the event Participant ceases to be a Service Provider for any or no reason before Participant vests in the
Restricted Stock Units, the Restricted Stock Units and Participant’s right to acquire any Shares hereunder will immediately terminate. 

Participant acknowledges receipt of a copy of the Plan and represents that he or she is familiar with the terms and provisions thereof, and
hereby accepts this Award Agreement subject to all of the terms and provisions thereof. Participant has reviewed the Plan and this Award Agreement in their entirety, has had an opportunity to obtain the advice of counsel prior to executing this
Award Agreement and fully understands all provisions of this Award Agreement. Participant hereby agrees to accept as binding, conclusive and final all decisions or interpretations of the Administrator upon any questions arising under the Plan or
this Award Agreement. Participant further agrees to notify the Company upon any change in the residence address indicated below. 

					
	PARTICIPANT	 		 	NANTKWEST, INC.
			
	  
	 		 	  

	Signature	 		 	By
			
	 «Name»
	 		 	  

	Print Name	 		 	Print Name
			
		 		 	  

		 		 	Title
			
	Address:	 		 	
			
	«Address»	 		 	

  
 - 2 - 

 NANTKWEST, INC. 

2015 EQUITY INCENTIVE PLAN 

RESTRICTED STOCK UNIT AWARD AGREEMENT 

TERMS AND CONDITIONS OF RESTRICTED STOCK UNIT GRANT 

(a) Grant of Restricted Stock Units. The Company hereby grants to the individual (the “Participant”) named in the Notice of
Grant of Restricted Stock Units of this Award Agreement (the “Notice of Grant”) under the Plan an Award of Restricted Stock Units, subject to all of the terms and conditions in this Award Agreement and the Plan, which is incorporated
herein by reference. Subject to Section 19(c) of the Plan, in the event of a conflict between the terms and conditions of the Plan and this Award Agreement, the terms and conditions of the Plan shall prevail. 

(b) Company’s Obligation to Pay. Each Restricted Stock Unit represents the right to receive a Share on the date it vests. Unless
and until the Restricted Stock Units will have vested in the manner set forth in Section 3 or 4, Participant will have no right to payment of any such Restricted Stock Units. Prior to actual payment of any vested Restricted Stock Units, such
Restricted Stock Unit will represent an unsecured obligation of the Company, payable (if at all) only from the general assets of the Company. 

(c) Vesting Schedule. Except as provided in Section 4, and subject to Section 5, the Restricted Stock Units awarded by this
Award Agreement will vest in accordance with the vesting schedule set forth in the Notice of Grant, subject to Participant continuing to be a Service Provider through each applicable vesting date. 

(d) Payment after Vesting. 

(i) General Rule. Subject to Section 6, any Restricted Stock Units that vest will be paid to Participant (or in the event of
Participant’s death, to his or her properly designated beneficiary or estate) in whole Shares. Subject to the provisions of Section 4(b), such vested Restricted Stock Units shall be paid in whole Shares as soon as practicable after
vesting, but in each such case within sixty (60) days following the vesting date. In no event will Participant be permitted, directly or indirectly, to specify the taxable year of payment of any Restricted Stock Units payable under this Award
Agreement. 
 (ii) Acceleration. 

(1) Discretionary Acceleration. The Administrator, in its discretion, may accelerate the vesting of the balance, or some lesser
portion of the balance, of the unvested Restricted Stock Units at any time, subject to the terms of the Plan. If so accelerated, such, such Restricted Stock Units will be considered as having vested as of the date specified by the Administrator. If
Participant is a U.S. taxpayer, the payment of Shares vesting pursuant to this Section 4(b) shall in all cases be paid at a time or in a manner that is exempt from, or complies with, Section 409A. The prior sentence may be superseded in a
future agreement or amendment to this Award Agreement only by direct and specific reference to such sentence. 

 (2) Notwithstanding anything in the Plan or this Award Agreement or any other agreement (whether
entered into before, on or after the Date of Grant), if the vesting of the balance, or some lesser portion of the balance, of the Restricted Stock Units is accelerated in connection with Participant’s termination as a Service Provider (provided
that such termination is a “separation from service” within the meaning of Section 409A, as determined by the Company), other than due to Participant’s death, and if (x) Participant is a U.S. taxpayer and a
“specified employee” within the meaning of Section 409A at the time of such termination as a Service Provider and (y) the payment of such accelerated Restricted Stock Units will result in the imposition of additional tax under
Section 409A if paid to Participant on or within the six (6) month period following Participant’s termination as a Service Provider, then the payment of such accelerated Restricted Stock Units will not be made until the date six
(6) months and one (1) day following the date of Participant’s termination as a Service Provider, unless Participant dies following his or her termination as a Service Provider, in which case, the Restricted Stock Units will be paid
in Shares to Participant’s estate as soon as practicable following his or her death. 
 (iii) Section 409A. It is the
intent of this Award Agreement that it and all payments and benefits to U.S. taxpayers hereunder be exempt from, or comply with, the requirements of Section 409A so that none of the Restricted Stock Units provided under this Award Agreement or
Shares issuable thereunder will be subject to the additional tax imposed under Section 409A, and any ambiguities herein will be interpreted to be so exempt or so comply. Each payment payable under this Award Agreement is intended to constitute
a separate payment for purposes of Treasury Regulation Section 1.409A-2(b)(2). For purposes of this Award Agreement, “Section 409A” means Section 409A of the Code, and any final Treasury Regulations and Internal Revenue Service
guidance thereunder, as each may be amended from time to time. 
 (e) Forfeiture Upon Termination as a Service Provider.
Notwithstanding any contrary provision of this Award Agreement, if Participant ceases to be a Service Provider for any or no reason, the then-unvested Restricted Stock Units awarded by this Award Agreement will thereupon be forfeited at no cost to
the Company and Participant will have no further rights thereunder. 
 (f) Death of Participant. Any distribution or delivery to be
made to Participant under this Award Agreement will, if Participant is then deceased, be made to Participant’s designated beneficiary, or if no beneficiary survives Participant, the administrator or executor of Participant’s estate. Any
such transferee must furnish the Company with (a) written notice of his or her status as transferee, and (b) evidence satisfactory to the Company to establish the validity of the transfer and compliance with any laws or regulations
pertaining to said transfer. 
 (g) Tax Consequences. Participant has reviewed with its own tax advisors the U.S. federal, state,
local and foreign tax consequences of this investment and the transactions contemplated by this Award Agreement. With respect to such matters, Participant relies solely on such advisors and not on any statements or representations of the Company or
any of its agents, written or oral. Participant understands that Participant (and not the Company) shall be responsible for Participant’s own tax liability that may arise as a result of this investment or the transactions contemplated by this
Award Agreement. 

  
 - 2 - 

 (h) Tax Obligations 

(i) Responsibility for Taxes. Participant acknowledges that, regardless of any action taken by the Company or, if different,
Participant’s employer (the “Employer”), the ultimate liability for any tax and/or social insurance liability obligations and requirements in connection with the Restricted Stock Units, including, without limitation, (a) all
federal, state, and local taxes (including the Participant’s Federal Insurance Contributions Act (FICA) obligation) that are required to be withheld by the Company or the Employer or other payment of tax-related items related to
Participant’s participation in the Plan and legally applicable to Participant, (b) the Participant’s and, to the extent required by the Company (or Employer), the Company’s (or Employer’s) fringe benefit tax liability, if
any, associated with the grant, vesting, or exercise of the Restricted Stock Units or sale of Shares, and (c) any other Company (or Employer) taxes the responsibility for which the Participant has, or has agreed to bear, with respect to the
Restricted Stock Units (or exercise thereof or issuance of Shares thereunder) (collectively, the “Tax Obligations”), is and remains Participant’s responsibility and may exceed the amount actually withheld by the Company or the
Employer. Participant further acknowledges that the Company and/or the Employer (i) make no representations or undertakings regarding the treatment of any Tax Obligations in connection with any aspect of the Restricted Stock Units, including,
but not limited to, the grant, vesting or settlement of the Restricted Stock Units, the subsequent sale of Shares acquired pursuant to such settlement and the receipt of any dividends or other distributions, and (ii) do not commit to and are
under no obligation to structure the terms of the grant or any aspect of the Restricted Stock Units to reduce or eliminate Participant’s liability for Tax Obligations or achieve any particular tax result. Further, if Participant is subject to
Tax Obligations in more than one jurisdiction between the Date of Grant and the date of any relevant taxable or tax withholding event, as applicable, Participant acknowledges that the Company and/or the Employer (or former employer, as applicable)
may be required to withhold or account for Tax Obligations in more than one jurisdiction. If Participant fails to make satisfactory arrangements for the payment of any required Tax Obligations hereunder at the time of the applicable taxable event,
Participant acknowledges and agrees that the Company may refuse to issue or deliver the Shares. 
 (ii) Tax Withholding. When Shares
are issued as payment for vested Restricted Stock Units, Participant generally will recognize immediate U.S. taxable income if Participant is a U.S. taxpayer. If Participant is a non-U.S. taxpayer, Participant will be subject to applicable taxes in
his or her jurisdiction. Pursuant to such procedures as the Administrator may specify from time to time, the Company and/or Employer shall withhold the minimum amount required to be withheld for the payment of Tax Obligations. The Administrator, in
its sole discretion and pursuant to such procedures as it may specify from time to time, may permit Participant to satisfy such Tax Obligations, in whole or in part (without limitation), if permissible by applicable local law, by (a) paying
cash, (b) electing to have the Company withhold otherwise deliverable Shares having a Fair Market Value equal to the amount of such Tax Obligations, (c) withholding the amount of such Tax Obligations from Participant’s wages or other
cash compensation paid to Participant by the company and/or the Employer, (d) delivering to the Company already vested and owned Shares having a Fair Market Value equal to such Tax Obligations, or (e) selling a sufficient number of such
Shares otherwise deliverable to Participant through such means as the 

  
 - 3 - 

 
Company may determine in its sole discretion (whether through a broker or otherwise) equal to the amount of the Tax Obligations. To the extent determined appropriate by the Company in its
discretion, it will have the right (but not the obligation) to satisfy any Tax Obligations by reducing the number of Shares otherwise deliverable to Participant and, until determined otherwise by the Company, this will be the method by which such
Tax Obligations are satisfied. Further, if Participant is subject to tax in more than one jurisdiction between the Date of Grant and a date of any relevant taxable or tax withholding event, as applicable, Participant acknowledges and agrees that the
Company and/or the Employer (and/or former employer, as applicable) may be required to withhold or account for tax in more than one jurisdiction. If Participant fails to make satisfactory arrangements for the payment of such Tax Obligations
hereunder at the time any applicable Restricted Stock Units otherwise are scheduled to vest pursuant to Sections 3 or 4, Participant will permanently forfeit such Restricted Stock Units and any right to receive Shares thereunder and the Restricted
Stock Units will be returned to the Company at no cost to the Company. Participant acknowledges and agrees that the Company may refuse to deliver the Shares if such Tax Obligations are not delivered at the time they are due. 

(i) Rights as Stockholder. Neither Participant nor any person claiming under or through Participant will have any of the rights or
privileges of a stockholder of the Company in respect of any Shares deliverable hereunder unless and until certificates representing such Shares (which may be in book entry form) will have been issued, recorded on the records of the Company or its
transfer agents or registrars, and delivered to Participant (including through electronic delivery to a brokerage account). After such issuance, recordation and delivery, Participant will have all the rights of a stockholder of the Company with
respect to voting such Shares and receipt of dividends and distributions on such Shares. 
 (j) No Guarantee of Continued Service.
PARTICIPANT ACKNOWLEDGES AND AGREES THAT THE VESTING OF THE RESTRICTED STOCK UNITS PURSUANT TO THE VESTING SCHEDULE HEREOF IS EARNED ONLY BY CONTINUING AS A SERVICE PROVIDER AT THE WILL OF THE COMPANY (OR THE EMPLOYER) AND NOT THROUGH THE ACT OF
BEING HIRED, BEING GRANTED THIS RESTRICTED STOCK UNIT AWARD OR ACQUIRING SHARES HEREUNDER. PARTICIPANT FURTHER ACKNOWLEDGES AND AGREES THAT THIS AGREEMENT, THE TRANSACTIONS CONTEMPLATED HEREUNDER AND THE VESTING SCHEDULE SET FORTH HEREIN DO NOT
CONSTITUTE AN EXPRESS OR IMPLIED PROMISE OF CONTINUED ENGAGEMENT AS A SERVICE PROVIDER FOR THE VESTING PERIOD, FOR ANY PERIOD, OR AT ALL, AND SHALL NOT INTERFERE IN ANY WAY WITH PARTICIPANT’S RIGHT OR THE RIGHT OF THE COMPANY (OR THE EMPLOYER)
TO TERMINATE PARTICIPANT’S RELATIONSHIP AS A SERVICE PROVIDER AT ANY TIME, WITH OR WITHOUT CAUSE. 
 (k) Grant is Not
Transferable. Except to the limited extent provided in Section 6, this grant and the rights and privileges conferred hereby will not be transferred, assigned, pledged or hypothecated in any way (whether by operation of law or otherwise) and
will not be subject to sale under execution, attachment or similar process. Upon any attempt to transfer, assign, pledge, hypothecate or otherwise dispose of this grant, or any right or privilege conferred hereby,

  
 - 4 - 

 
or upon any attempted sale under any execution, attachment or similar process, this grant and the rights and privileges conferred hereby immediately will become null and void. 

(l) Nature of Grant. In accepting the grant, Participant acknowledges, understands and agrees that: 

(i) the grant of the Restricted Stock Units is voluntary and occasional and does not create any contractual or other right to receive future
grants of Restricted Stock Units, or benefits in lieu of Restricted Stock Units, even if Restricted Stock Units have been granted in the past; 

(ii) all decisions with respect to future Restricted Stock Units or other grants, if any, will be at the sole discretion of the Company; 

(iii) Participant is voluntarily participating in the Plan; 

(iv) the Restricted Stock Units and the Shares subject to the Restricted Stock Units are not intended to replace any pension rights or
compensation; 
 (v) the Restricted Stock Units and the Shares subject to the Restricted Stock Units, and the income and value of same, are
not part of normal or expected compensation for purposes of calculating any severance, resignation, termination, redundancy, dismissal, end-of-service payments, bonuses, long-service awards, pension or retirement or welfare benefits or similar
payments; 
 (vi) the future value of the underlying Shares is unknown, indeterminable and cannot be predicted; 

(vii) for purposes of the Restricted Stock Units, Participant’s status as a Service Provider will be considered terminated as of the date
Participant is no longer actively providing services to the Company or any Parent or Subsidiary (regardless of the reason for such termination and whether or not later to be found invalid or in breach of employment laws in the jurisdiction where
Participant is a Service Provider or the terms of Participant’s employment or service agreement, if any), and unless otherwise expressly provided in this Award Agreement (including by reference in the Notice of Grant to other arrangements or
contracts) or determined by the Administrator, Participant’s right to vest in the Restricted Stock Units under the Plan, if any, will terminate as of such date and will not be extended by any notice period (e.g., Participant’s period of
service would not include any contractual notice period or any period of “garden leave” or similar period mandated under employment laws in the jurisdiction where Participant is a Service Provider or the terms of Participant’s
employment or service agreement, if any, unless Participant is providing bona fide services during such time); the Administrator shall have the exclusive discretion to determine when Participant is no longer actively providing services for purposes
of the Restricted Stock Units grant (including whether Participant may still be considered to be providing services while on a leave of absence); 

(viii) unless otherwise provided in the Plan or by the Company in its discretion, the Restricted Stock Units and the benefits evidenced by
this Award Agreement do not create any entitlement to have the Restricted Stock Units or any such benefits transferred to, or assumed by, 

  
 - 5 - 

 
another company nor be exchanged, cashed out or substituted for, in connection with any corporate transaction affecting the Shares; and 

(ix) the following provisions apply only if Participant is providing services outside the United States: 

 

	 	(1)	the Restricted Stock Units and the Shares subject to the Restricted Stock Units are not part of normal or expected compensation or salary for any purpose; 

 

	 	(2)	Participant acknowledges and agrees that none of the Company, the Employer or any Parent or Subsidiary shall be liable for any foreign exchange rate fluctuation between Participant’s local currency and the United
States Dollar that may affect the value of the Restricted Stock Units or of any amounts due to Participant pursuant to the settlement of the Restricted Stock Units or the subsequent sale of any Shares acquired upon settlement; and 

 

	 	(3)	no claim or entitlement to compensation or damages shall arise from forfeiture of the Restricted Stock Units resulting from the termination of Participant’s status as a Service Provider (for any reason whatsoever
whether or not later found to be invalid or in breach of employment laws in the jurisdiction where Participant is a Service Provider or the terms of Participant’s employment or service agreement, if any), and in consideration of the grant of
the Restricted Stock Units to which Participant is otherwise not entitled, Participant irrevocably agrees never to institute any claim against the Company, any Parent or Subsidiary or the Employer, waives his or her ability, if any, to bring
any such claim, and releases the Company, any Parent or Subsidiary and the Employer from any such claim; if, notwithstanding the foregoing, any such claim is allowed by a court of competent jurisdiction, then, by participating in the Plan,
Participant shall be deemed irrevocably to have agreed not to pursue such claim and agrees to execute any and all documents necessary to request dismissal or withdrawal of such claim. 

(m) No Advice Regarding Grant. The Company is not providing any tax, legal or financial advice, nor is the Company making any
recommendations regarding Participant’s participation in the Plan, or Participant’s acquisition or sale of the underlying Shares. Participant is hereby advised to consult with his or her own personal tax, legal and financial advisors
regarding his or her participation in the Plan before taking any action related to the Plan. 
 (n) Data
Privacy. Participant hereby explicitly and unambiguously consents to the collection, use and transfer, in electronic or other form, of Participant’s personal data as described in this Award Agreement and any other Restricted Stock
Unit grant materials by and among, as applicable, the Employer, the Company and any Parent or Subsidiary for the 

  
 - 6 - 

 
exclusive purpose of implementing, administering and managing Participant’s participation in the Plan. 

Participant understands that the Company and the Employer may hold certain personal information about Participant, including, but not
limited to, Participant’s name, home address and telephone number, date of birth, social insurance number or other identification number, salary, nationality, job title, any Shares or directorships held in the Company, details of all Restricted
Stock Units or any other entitlement to Shares awarded, canceled, exercised, vested, unvested or outstanding in Participant’s favor (“Data”), for the exclusive purpose of implementing, administering and managing the Plan. 

Participant understands that Data will be transferred to a stock plan service provider as may be selected by the Company in the future,
which is assisting the Company with the implementation, administration and management of the Plan. Participant understands that the recipients of the Data may be located in the United States or elsewhere, and that the recipients’ country of
operation (e.g., the United States) may have different data privacy laws and protections than Participant’s country. Participant understands that if he or she resides outside the United States, he or she may request a list with the names and
addresses of any potential recipients of the Data by contacting his or her local human resources representative. Participant authorizes the Company, any stock plan service provider selected by the Company and any other possible recipients which may
assist the Company (presently or in the future) with implementing, administering and managing the Plan to receive, possess, use, retain and transfer the Data, in electronic or other form, for the sole purpose of implementing, administering and
managing his or her participation in the Plan. Participant understands that Data will be held only as long as is necessary to implement, administer and manage Participant’s participation in the Plan. Participant understands if he or she resides
outside the United States, he or she may, at any time, view Data, request additional information about the storage and processing of Data, require any necessary amendments to Data or refuse or withdraw the consents herein, in any case without cost,
by contacting in writing his or her local human resources representative. Further, Participant understands that he or she is providing the consents herein on a purely voluntary basis. If Participant does not consent, or if Participant later seeks to
revoke his or her consent, his or her status as a Service Provider and career with the Employer will not be adversely affected; the only adverse consequence of refusing or withdrawing Participant’s consent is that the Company would not be able
to grant Participant Restricted Stock Units or other equity awards or administer or maintain such awards. Therefore, Participant understands that refusing or withdrawing his or her consent may affect Participant’s ability to participate in the
Plan. For more information on the consequences of Participant’s refusal to consent or withdrawal of consent, Participant understands that he or she may contact his or her local human resources representative. 

(o) Address for Notices. Any notice to be given to the Company under the terms of this Award Agreement will be addressed to the Company
at NantKwest, Inc., 2533 South Coast Highway 101, Suite 210, Cardiff-by-the-Sea, CA 92007, or at such other address as the Company may hereafter designate in writing. 

(p) Electronic Delivery and Acceptance. The Company may, in its sole discretion, decide to deliver any documents related to the
Restricted Stock Units awarded under the Plan or 

  
 - 7 - 

 
future Restricted Stock Units that may be awarded under the Plan by electronic means or request Participant’s consent to participate in the Plan by electronic means. Participant hereby
consents to receive such documents by electronic delivery and agrees to participate in the Plan through any on-line or electronic system established and maintained by the Company or another third party designated by the Company. 

(q) No Waiver. Either party’s failure to enforce any provision or provisions of this Agreement shall not in any way be construed
as a waiver of any such provision or provisions, nor prevent that party from thereafter enforcing each and every other provision of this Agreement. The rights granted both parties herein are cumulative and shall not constitute a waiver of either
party’s right to assert all other legal remedies available to it under the circumstances. 
 (r) Successors and Assigns. The
Company may assign any of its rights under this Agreement to single or multiple assignees, and this Agreement shall inure to the benefit of the successors and assigns of the Company. Subject to the restrictions on transfer herein set forth, this
Agreement shall be binding upon Participant and his or her heirs, executors, administrators, successors and assigns. The rights and obligations of Participant under this Agreement may only be assigned with the prior written consent of the Company.

 (s) Additional Conditions to Issuance of Stock. If at any time the Company will determine, in its discretion, that the listing,
registration, qualification or rule compliance of the Shares upon any securities exchange or under any state, federal or foreign law, the tax code and related regulations or under the rulings or regulations of the United States Securities and
Exchange Commission or any other governmental regulatory body or the clearance, consent or approval of the United States Securities and Exchange Commission or any other governmental regulatory authority is necessary or desirable as a condition to
the issuance of Shares to Participant (or his or her estate) hereunder, such issuance will not occur unless and until such listing, registration, qualification, rule compliance, clearance, consent or approval will have been completed, effected or
obtained free of any conditions not acceptable to the Company. Subject to the terms of the Agreement and the Plan, the Company shall not be required to issue any certificate or certificates for Shares hereunder prior to the lapse of such reasonable
period of time following the date of vesting of the Restricted Stock Units as the Administrator may establish from time to time for reasons of administrative convenience. 

(t) Language. If Participant has received this Agreement or any other document related to the Plan translated into a language other
than English and if the meaning of the translated version is different than the English version, the English version will control. 
 (u)
Interpretation. The Administrator will have the power to interpret the Plan and this Award Agreement and to adopt such rules for the administration, interpretation and application of the Plan as are consistent therewith and to interpret or
revoke any such rules (including, but not limited to, the determination of whether or not any Restricted Stock Units have vested). All actions taken and all interpretations and determinations made by the Administrator in good faith will be final and
binding upon Participant, the Company and all other interested persons. Neither the Administrator nor any person acting on behalf of the Administrator will be personally liable 

  
 - 8 - 

 
for any action, determination or interpretation made in good faith with respect to the Plan or this Award Agreement. 

(v) Captions. Captions provided herein are for convenience only and are not to serve as a basis for interpretation or construction of
this Award Agreement. 
 (w) Modifications to the Agreement. This Award Agreement constitutes the entire understanding of the parties
on the subjects covered. Participant expressly warrants that he or she is not accepting this Award Agreement in reliance on any promises, representations, or inducements other than those contained herein. Modifications to this Award Agreement or the
Plan can be made only in an express written contract executed by a duly authorized officer of the Company. Notwithstanding anything to the contrary in the Plan or this Award Agreement, the Company reserves the right to revise this Award Agreement as
it deems necessary or advisable, in its sole discretion and without the consent of Participant, to comply with Section 409A or to otherwise avoid imposition of any additional tax or income recognition under Section 409A in connection to
this Award of Restricted Stock Units. 
 (x) Governing Law and Venue. This Award Agreement will be governed by the laws of
California, without giving effect to the conflict of law principles thereof. For purposes of litigating any dispute that arises under the Restricted Stock Units or this Award Agreement, the parties hereby submit to and consent to the jurisdiction of
the State of California, and agree that such litigation will be conducted in the courts of Los Angeles, California or the federal courts for the United States for the Central District of California, and no other courts. 

(y) Agreement Severable. In the event that any provision in this Award Agreement will be held invalid or unenforceable, such provision
will be severable from, and such invalidity or unenforceability will not be construed to have any effect on, the remaining provisions of this Award Agreement. 

(z) Amendment, Suspension or Termination of the Plan. By accepting this Award, Participant expressly warrants that he or she has
received Restricted Stock Units under the Plan, and has received, read and understood a description of the Plan. Participant understands that the Plan is discretionary in nature and may be amended, suspended or terminated by the Company at any time.

 (aa) Entire Agreement. The Plan is incorporated herein by reference. The Plan and this Award Agreement (including the exhibits
referenced herein) constitute the entire agreement of the parties with respect to the subject matter hereof and supersede in their entirety all prior undertakings and agreements of the Company and Participant with respect to the subject matter
hereof, and may not be modified adversely to the Participant’s interest except by means of a writing signed by the Company and Participant. 

(bb) [Country Addendum. Notwithstanding any provisions in this Award Agreement, the Restricted Stock Unit grant shall be subject to any
special terms and conditions set forth in any appendix to this Award Agreement for Participant’s country. Moreover, if Participant relocates to one of the countries included in the Country Addendum, the special terms and conditions for such
country will apply to Participant, to the extent the Company determines that 

  
 - 9 - 

 
the application of such terms and conditions is necessary or advisable for legal or administrative reasons. The Country Addendum constitutes part of this Award Agreement.] 

  
 - 10 - 

 NANTKWEST, INC. 

2015 EQUITY INCENTIVE PLAN 

RESTRICTED STOCK UNIT AGREEMENT 

COUNTRY ADDENDUM 
 TERMS AND
CONDITIONS 
 This Country Addendum includes additional terms and conditions that govern the award of Restricted Stock Units under the Plan if
Participant works in one of the countries listed below. If Participant is a citizen or resident of a country (or is considered as such for local law purposes) other than the one in which he or she is currently working or if Participant relocates to
another country after receiving the Award of Restricted Stock Units, the Company will, in its discretion, determine the extent to which the terms and conditions contained herein will be applicable to Participant. 

Certain capitalized terms used but not defined in this Country Addendum shall have the meanings set forth in the Plan and/or the Award Agreement to which this
Country Addendum is attached. 
 NOTIFICATIONS 

This Country Addendum also includes notifications relating to exchange control and other issues of which Participant should be aware with respect to his or her
participation in the Plan. The information is based on the exchange control, securities and other laws in effect in the countries listed in this Country Addendum, as of [DATE]. Such laws are often complex and change frequently. As a result, the
Company strongly recommends that Participant not rely on the notifications herein as the only source of information relating to the consequences of his or her participation in the Plan because the information may be outdated when Participant vests
in the Restricted Stock Units and acquires Shares, or when Participant subsequently sell Shares acquired under the Plan. 
 In addition, the notifications
are general in nature and may not apply to Participant’s particular situation, and the Company is not in a position to assure Participant of any particular result. Accordingly, Participant is advised to seek appropriate professional advice as
to how the relevant laws in Participant’s country may apply to Participant’s situation. 
 Finally, if Participant is a citizen or resident of a
country other than the one in which Participant is currently working (or is considered as such for local law purposes) or if Participant moves to another country after receiving an Award of Restricted Stock Units, the information contained herein
may not be applicable to Participant. 

  
 - 11 -EX-10.4

 Exhibit 10.4 

CONKWEST, INC. 

EXECUTIVE INCENTIVE COMPENSATION PLAN 

Adopted by the Board of Directors on July 13, 2015 

and effective immediately prior to the Company’s initial public offering 

1. Purposes of the Plan. The Plan is intended to increase stockholder value and the success of the Company by motivating Employees to
(a) perform to the best of their abilities, and (b) achieve the Company’s objectives. 
 2. Definitions. 

(a) “Actual Award” means as to any Performance Period, the actual award (if any) payable to a Participant for the Performance
Period, subject to the Committee’s authority under Section 3(d) to modify the award. 
 (b) “Affiliate” means any
corporation or other entity (including, but not limited to, partnerships and joint ventures) controlled by the Company. 
 (c)
“Board” means the Board of Directors of the Company. 
 (d) “Bonus Pool” means the pool of funds available
for distribution to Participants. Subject to the terms of the Plan, the Committee establishes the Bonus Pool for each Performance Period. 

(e) “Code” means the Internal Revenue Code of 1986, as amended. Reference to a specific section of the Code or regulation
thereunder will include such section or regulation, any valid regulation promulgated thereunder, and any comparable provision of any future legislation or regulation amending, supplementing or superseding such section or regulation. 

(f) “Committee” means the committee appointed by the Board (pursuant to Section 5) to administer the Plan. Unless and
until the Board otherwise determines, the Board’s Compensation Committee will administer the Plan. 
 (g) “Company”
means Conkwest, Inc., a Delaware corporation, or any successor thereto. 
 (h) “Disability” means a permanent and total
disability determined in accordance with uniform and nondiscriminatory standards adopted by the Committee from time to time. 

 (i) “Employee” means any executive, officer, or key employee of the Company or
of an Affiliate, whether such individual is so employed at the time the Plan is adopted or becomes so employed subsequent to the adoption of the Plan. 

(j) “Fiscal Year” means the fiscal year of the Company. 

(k) “Participant” means as to any Performance Period, an Employee who has been selected by the Committee for participation in
the Plan for that Performance Period. 
 (l) “Performance Period” means the period of time for the measurement of the
performance criteria that must be met to receive an Actual Award, as determined by the Committee in its sole discretion. A Performance Period may be divided into one or more shorter periods if, for example, but not by way of limitation, the
Committee desires to measure some performance criteria over 12 months and other criteria over 3 months. 
 (m) “Plan” means
this Executive Incentive Compensation Plan, as set forth in this instrument and as hereafter amended from time to time. 
 (n)
“Target Award” means the target award, at 100% performance achievement, payable under the Plan to a Participant for the Performance Period, as determined by the Committee in accordance with Section 3(b). 

(o) “Termination of Service” means a cessation of the employee-employer relationship between an Employee and the Company or
an Affiliate for any reason, including, but not by way of limitation, a termination by resignation, discharge, death, Disability, retirement, or the disaffiliation of an Affiliate, but excluding any such termination where there is a simultaneous
reemployment by the Company or an Affiliate. 
 3. Selection of Participants and Determination of Awards. 

(a) Selection of Participants. The Committee, in its sole discretion, will select the Employees who will be Participants for any
Performance Period. Participation in the Plan is in the sole discretion of the Committee, on a Performance Period by Performance Period basis. Accordingly, an Employee who is a Participant for a given Performance Period in no way is guaranteed or
assured of being selected for participation in any subsequent Performance Period or Performance Periods. 
 (b) Determination of Target
Awards. The Committee, in its sole discretion, will establish a Target Award for each Participant (which may be expressed as a percentage of a Participant’s average annual base salary for the Performance Period). 

(c) Bonus Pool. Each Performance Period, the Committee, in its sole discretion, will establish a Bonus Pool, which pool may be
established before, during or after the applicable Performance Period. Actual Awards will be paid from the Bonus Pool. 

  
 -2- 

 (d) Discretion to Modify Awards. Notwithstanding any contrary provision of the Plan, the
Committee may, in its sole discretion and at any time, (i) increase, reduce or eliminate a Participant’s Actual Award, and/or (ii) increase, reduce or eliminate the amount allocated to the Bonus Pool. The Actual Award may be below, at
or above the Target Award, in the Committee’s discretion. The Committee may determine the amount of any reduction on the basis of such factors as it deems relevant, and will not be required to establish any allocation or weighting with respect
to the factors it considers. 
 (e) Discretion to Determine Criteria. Notwithstanding any contrary provision of the Plan, the
Committee will, in its sole discretion, determine the performance goals applicable to any Target Award which requirement may include, without limitation, (i) attainment of research and development milestones, (ii) sales bookings,
(iii) business divestitures and acquisitions, (iv) cash flow, (v) cash position, (vi) earnings (which may include any calculation of earnings, including but not limited to earnings before interest and taxes, earnings before
taxes, earnings before interested, taxes, depreciation and amortization and net earnings), (vii) earnings per share, (viii) net income, (ix) net profit, (x) net sales, (xi) operating cash flow, (xii) operating expenses,
(xiii) operating income, (xiv) operating margin, (xv) overhead or other expense reduction, (xvi) product defect measures, (xvii) product release timelines, (xviii) productivity, (xix) profit, (xx) return on
assets, (xxi) return on capital, (xxii) return on equity, (xxiii) return on investment, (xxiv) return on sales, (xxv) revenue, (xxvi) revenue growth, (xxvii) sales results, (xviii) sales growth,
(xxix) stock price, (xxx) time to market, (xxxi) total stockholder return, (xxxii) working capital, and (xxxiii) individual objectives such as peer reviews or other subjective or objective criteria. As determined by the
Committee, the performance goals may be based on generally accepted accounting principles (“GAAP”) or non-GAAP results and any actual results may be adjusted by the Committee for one-time items or unbudgeted or unexpected items when
determining whether the performance goals have been met. The goals may be on the basis of any factors the Committee determines relevant, and may be on an individual, divisional, business unit or Company-wide basis. Any criteria used may be measured
on such basis as the Committee determines, including but not limited to, as applicable, (A) in absolute terms, (B) in combination with another performance goal or goals (for example, but not by way of limitation, as a ratio or matrix),
(C) in relative terms (including, but not limited to, results for other periods, passage of time and/or against another company or companies or an index or indices), (D) on a per-share basis, (E) against the performance of the Company
as a whole or a segment of the Company and/or (F) on a pre-tax or after-tax basis.The performance goals may differ from Participant to Participant and from award to award. Failure to meet the goals will result in a failure to earn the Target
Award, except as provided in Section 3(d). 
 4. Payment of Awards. 

(a) Right to Receive Payment. Each Actual Award will be paid solely from the general assets of the Company. Nothing in this Plan will
be construed to create a trust or to establish or evidence any Participant’s claim of any right other than as an unsecured general creditor with respect to any payment to which he or she may be entitled. 

(b) Timing of Payment. Payment of each Actual Award shall be made as soon as practicable after the end of the Performance Period during
which the Actual Award was earned and after the Actual Award is approved by the Committee, but in no event following the later of (i) the fifteenth (15th) day of the third (3rd) month of the Fiscal Year immediately following the
Fiscal Year in which the Participant’s Actual Award has been earned and no longer is subject to a substantial risk of forfeiture, and (ii) March 15 of the calendar year immediately 

  
 -3- 

 
following the calendar year in which the Participant’s Actual Award has been earned and no longer is subject to a substantial risk of forfeiture. Unless otherwise determined by the
Committee, to earn an Actual Award a Participant must be employed by the Company or any Affiliate on the date the Actual Award is paid. 

It is the intent that this Plan comply with the requirements of Code Section 409A so that none of the payments to be provided hereunder
will be subject to the additional tax imposed under Code Section 409A, and any ambiguities herein will be interpreted to so comply. 

(c) Form of Payment. Each Actual Award will be paid in cash (or its equivalent) in a single lump sum. 

(d) Payment in the Event of Death or Disability. If a Participant dies or becomes Disabled prior to the payment of an Actual Award
earned by him or her prior to death or Disability for a prior Performance Period, the Actual Award will be paid to his or her estate or to the Participant, as the case may be, subject to the Committee’s discretion to reduce or eliminate any
Actual Award otherwise payable. 
 5. Plan Administration. 

(a) Committee is the Administrator. The Plan will be administered by the Committee. The Committee will consist of not less than two
(2) members of the Board. The members of the Committee will be appointed from time to time by, and serve at the pleasure of, the Board. 

(b) Committee Authority. It will be the duty of the Committee to administer the Plan in accordance with the Plan’s provisions. The
Committee will have all powers and discretion necessary or appropriate to administer the Plan and to control its operation, including, but not limited to, the power to (i) determine which Employees will be granted awards, (ii) prescribe
the terms and conditions of awards, (iii) interpret the Plan and the awards, (iv) adopt such procedures and subplans as are necessary or appropriate to permit participation in the Plan by Employees who are foreign nationals or employed
outside of the United States, (v) adopt rules for the administration, interpretation and application of the Plan as are consistent therewith, and (vi) interpret, amend or revoke any such rules. 

(c) Decisions Binding. All determinations and decisions made by the Committee, the Board, and any delegate of the Committee pursuant to
the provisions of the Plan will be final, conclusive, and binding on all persons, and will be given the maximum deference permitted by law. 

(d) Delegation by Committee. The Committee, in its sole discretion and on such terms and conditions as it may provide, may delegate all
or part of its authority and powers under the Plan to one or more directors and/or officers of the Company. 
 (e)
Indemnification. Each person who is or will have been a member of the Committee will be indemnified and held harmless by the Company against and from (i) any loss, cost, liability, or expense that may be imposed upon or reasonably
incurred by him or her in 

  
 -4- 

 
connection with or resulting from any claim, action, suit, or proceeding to which he or she may be a party or in which he or she may be involved by reason of any action taken or failure to act
under the Plan or any award, and (ii) from any and all amounts paid by him or her in settlement thereof, with the Company’s approval, or paid by him or her in satisfaction of any judgment in any such claim, action, suit, or proceeding
against him or her, provided he or she will give the Company an opportunity, at its own expense, to handle and defend the same before he or she undertakes to handle and defend it on his or her own behalf. The foregoing right of indemnification will
not be exclusive of any other rights of indemnification to which such persons may be entitled under the Company’s Certificate of Incorporation or Bylaws, by contract, as a matter of law, or otherwise, or under any power that the Company may
have to indemnify them or hold them harmless. 
 6. General Provisions. 

(a) Tax Withholding. The Company will withhold all applicable taxes from any Actual Award, including any federal, state and local taxes
(including, but not limited to, the Participant’s FICA and SDI obligations). 
 (b) No Effect on Employment or Service. Nothing
in the Plan will interfere with or limit in any way the right of the Company to terminate any Participant’s employment or service at any time, with or without cause. For purposes of the Plan, transfer of employment of a Participant between the
Company and any one of its Affiliates (or between Affiliates) will not be deemed a Termination of Service. Employment with the Company and its Affiliates is on an at-will basis only. The Company expressly
reserves the right, which may be exercised at any time and without regard to when during a Performance Period such exercise occurs, to terminate any individual’s employment with or without cause, and to treat him or her without regard to the
effect that such treatment might have upon him or her as a Participant. 
 (c) Participation. No Employee will have the right to be
selected to receive an award under this Plan, or, having been so selected, to be selected to receive a future award. 
 (d)
Successors. All obligations of the Company under the Plan, with respect to awards granted hereunder, will be binding on any successor to the Company, whether the existence of such successor is the result of a direct or indirect purchase,
merger, consolidation, or otherwise, of all or substantially all of the business or assets of the Company. 
 (e) Beneficiary
Designations. If permitted by the Committee, a Participant under the Plan may name a beneficiary or beneficiaries to whom any vested but unpaid award will be paid in the event of the Participant’s death. Each such designation will revoke
all prior designations by the Participant and will be effective only if given in a form and manner acceptable to the Committee. In the absence of any such designation, any vested benefits remaining unpaid at the Participant’s death will be paid
to the Participant’s estate. 
 (f) Nontransferability of Awards. No award granted under the Plan may be sold, transferred,
pledged, assigned, or otherwise alienated or hypothecated, other than by will, by the laws of descent and distribution, or to the limited extent provided in Section 6(e). All rights with respect to an award granted to a Participant will be
available during his or her lifetime only to the Participant. 

  
 -5- 

 7. Amendment, Termination, and Duration. 

(a) Amendment, Suspension, or Termination. The Board, in its sole discretion, may amend or terminate the Plan, or any part thereof, at
any time and for any reason. The amendment, suspension or termination of the Plan will not, without the consent of the Participant, alter or impair any rights or obligations under any Actual Award theretofore earned by such Participant. No award may
be granted during any period of suspension or after termination of the Plan. 
 (b) Duration of Plan. The Plan will commence on the
date specified herein, and subject to Section 7(a) (regarding the Board’s right to amend or terminate the Plan), will remain in effect thereafter. 

8. Legal Construction. 

(a) Gender and Number. Except where otherwise indicated by the context, any masculine term used herein also will include the feminine;
the plural will include the singular and the singular will include the plural. 
 (b) Severability. In the event any provision of the
Plan will be held illegal or invalid for any reason, the illegality or invalidity will not affect the remaining parts of the Plan, and the Plan will be construed and enforced as if the illegal or invalid provision had not been included. 

(c) Requirements of Law. The granting of awards under the Plan will be subject to all applicable laws, rules and regulations, and to
such approvals by any governmental agencies or national securities exchanges as may be required. 
 (d) Governing Law. The Plan and
all awards will be construed in accordance with and governed by the laws of the State of California, but without regard to its conflict of law provisions. 

(e) Bonus Plan. The Plan is intended to be a “bonus program” as defined under U.S. Department of Labor regulation 2510.3-2(c)
and will be construed and administered in accordance with such intention. 
 (f) Captions. Captions are provided herein for
convenience only, and will not serve as a basis for interpretation or construction of the Plan. 

  
 -6-

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