EX-10.1





 Exhibit 10.1 

LYELL IMMUNOPHARMA, INC. 

2018 EQUITY INCENTIVE PLAN 

As Adopted on August 23, 2018 

As amended on September 19, 2018 

As amended on November 6, 2018 

As amended on March 5, 2019 

As amended on August 29, 2019 

As amended on January 6, 20201 

As amended on March 4, 2020 

As amended on January 21, 2021 

1. PURPOSE. The purpose of this Plan is to provide incentives to attract, retain and motivate eligible persons
whose present and potential contributions are important to the success of the Company, its Parent and Subsidiaries by offering eligible persons an opportunity to participate in the Company’s future performance through the grant of Awards
covering Shares. Capitalized terms not defined in the text are defined in Section 14 hereof. Although this Plan is intended to be a written compensatory benefit plan within the meaning of Rule 701, grants may be made pursuant to this Plan
that do not qualify for exemption under Rule 701 or Section 25102(o). Any requirement of this Plan that is required in law only because of Section 25102(o) need not apply if the Committee so provides. 

2. SHARES SUBJECT TO THE PLAN. 

2.1 Number of Shares Available. Subject to Sections 2.2 and 11 hereof, the total number of Shares reserved and
available for grant and issuance pursuant to this Plan will be 47,044,980 Shares. Subject to Sections 2.2 and 11 hereof, (A) in the event that Shares previously issued under the Plan are reacquired by the Company pursuant to a forfeiture
provision, right of first refusal, or repurchase by the Company, such Shares shall be added to the number of Shares then available for issuance under the Plan; (B) in the event that Shares that otherwise would have been issuable under the Plan
are withheld by the Company in payment of the Purchase Price, Exercise Price or withholding obligations, such Shares shall remain available for issuance under the Plan; and (C) in the event that an outstanding Option, Restricted Stock Unit or
SAR for any reason expires or is cancelled, forfeited or terminated, the Shares allocable to the unexercised or unsettled portion of such Option, Restricted Stock Unit or SAR, as applicable, shall remain available for issuance under the Plan. To the
extent an Award is settled in cash, the cash settlement shall not reduce the number of Shares remaining available for issuance under the Plan. At all times the Company will reserve and keep available a sufficient number of Shares as will be required
to satisfy the requirements of all Awards granted and outstanding under this Plan. In no event shall the total number of Shares issued (counting each reissuance of a Share that was previously issued and then reacquired by the Company pursuant to a
forfeiture provision, right of first refusal, or repurchase by the Company as a separate issuance) under the Plan upon exercise of ISOs (as defined in Section 4 hereof) exceed 94,089,960 Shares (adjusted in proportion to any adjustments under
Section 2.2 hereof) over the term of the Plan. 
  

	1 	 Approved by the Board of Directors on December 20, 2019, conditional upon a charter amendment that
occurred on January 6, 2020. 



  
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 2.2 Adjustment of Shares. In the event that the Company’s
Common Stock is changed by a stock dividend, recapitalization, stock split, reverse stock split, subdivision, combination, reclassification or other change in the capital structure of the Company affecting Shares without consideration, then in order
to prevent diminution or enlargement of the benefits or potential benefits intended to be made available under the Plan (a) the number and class of Shares reserved for issuance under this Plan, (b) the Exercise Prices of and number and
class of Shares subject to outstanding Options and SARs, and (c) the Purchase Prices of and/or number and class of Shares subject to other outstanding Awards will (to the extent appropriate) be proportionately adjusted, subject to any required
action by the Board or the stockholders of the Company and compliance with applicable securities or other laws; provided, however, that fractions of a Share will not be issued but will either be paid in cash at the Fair
Market Value of such fraction of a Share or will be rounded down to the nearest whole Share, as determined by the Committee. 
 3.
PLAN FOR BENEFIT OF SERVICE PROVIDERS. 
 3.1 Eligibility. The Committee will have the authority to
select persons to receive Awards. ISOs may be granted only to employees (including officers and directors who are also employees) of the Company or of a Parent or Subsidiary of the Company. NQSOs (as defined in Section 4 hereof) and all other
types of Awards may be granted to employees, officers, directors and consultants of the Company or any Parent or Subsidiary of the Company; provided such consultants render bona fide services not in connection with the offer and sale
of securities in a capital-raising transaction when Rule 701 is to apply to the Award granted for such services. A person may be granted more than one Award under this Plan. 

3.2 No Obligation to Employ. Nothing in this Plan or any Award granted under this Plan will confer or be deemed to
confer on any Participant any right to continue in the employ of, or to continue any other relationship with, the Company or any Subsidiary or Parent of the Company or limit in any way the right of the Company or any Subsidiary or Parent of the
Company to terminate Participant’s employment or other relationship at any time, with or without Cause. 
 4.
OPTIONS. The Committee may grant Options to eligible persons described in Section 3 hereof and will determine whether such Options will be Incentive Stock Options within the meaning of the Code
(“ISOs”) or Nonqualified Stock Options (“NQSOs”), the number of Shares subject to the Option, the Exercise Price of the Option, the period during which the Option may be exercised, and all other terms
and conditions of the Option, subject to the following. 
 4.1 Form of Option Grant. Each Option granted under
this Plan will be evidenced by an Award Agreement which will expressly identify the Option as an ISO or an NQSO (“Stock Option Agreement”), and will be in such form and contain such provisions (which need not be the same for
each Participant) as the Committee may from time to time approve, and which will comply with and be subject to the terms and conditions of this Plan. 

  
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 4.2 Date of Grant. The date of grant of an Option will be the
date on which the Committee makes the determination to grant such Option, unless a later date is otherwise specified by the Committee. The Stock Option Agreement and a copy of this Plan will be delivered to the Participant within a reasonable time
after the granting of the Option. 
 4.3 Exercise Period. Options may be exercisable within the time or upon the
events determined by the Committee in the Award Agreement and may be awarded as immediately exercisable but subject to repurchase pursuant to Section 10 hereof or may be exercisable within the times or upon the events determined by the
Committee as set forth in the Stock Option Agreement governing such Option; provided, however, that (a) no Option will be exercisable after the expiration of ten (10) years from the date the Option is granted;
and (b) no ISO granted to a person who directly or by attribution owns more than ten percent (10%) of the total combined voting power of all classes of stock of the Company or of any Subsidiary or Parent of the Company (“Ten Percent
Stockholder”) will be exercisable after the expiration of five (5) years from the date the ISO is granted; but in no event shall an Option granted to an employee who is a non-exempt employee
for purposes of overtime pay under the U.S. Fair Labor Standards Act of 1938 be exercisable earlier than six (6) months after its date of grant. The Committee also may provide for Options to become exercisable at one time or from time to time,
periodically or otherwise, in such number of Shares or percentage of Shares as the Committee determines. In addition, if an Option is determined to otherwise be subject to Section 409A of the Code, such Option shall be exercisable for the
Shares subject to such Option no later than the end of the applicable short-term deferral period determined under Section 409A of the Code by the Committee, except as otherwise determined by the Committee. 

4.4 Exercise Price. The Exercise Price of an Option will be determined by the Committee when the Option is granted
and shall not be less than the Fair Market Value per Share on the date of grant unless expressly determined in writing by the Committee; provided that the Exercise Price of an ISO granted to a Ten Percent Stockholder will not be less
than one hundred ten percent (110%) of the Fair Market Value of the Shares on the date of grant. Payment for the Shares purchased must be made in accordance with Section 8 hereof. 

4.5 Method of Exercise. Options may be exercised only by delivery to the Company of a stock option exercise
agreement (accepted via written, electronic or other means) (the “Exercise Agreement”) in a form approved by the Committee (which need not be the same for each Participant). The Exercise Agreement will state (a) the
number of Shares being purchased, (b) the restrictions imposed on the Shares purchased under such Exercise Agreement, if any, and (c) such representations and agreements regarding Participant’s investment intent and access to
information and other matters, if any, as may be required or desirable by the Company to comply with applicable securities or other laws. Each Participant’s Exercise Agreement may be modified by (i) agreement of Participant and the Company
or (ii) substitution by the Company, upon becoming a public company, in order to add the payment terms set forth in Section 8.1 that apply to a public company and such other terms as shall be necessary or advisable in order to exercise a
public company option. Upon exercise of an Option, Participant shall execute and deliver to the Company the Exercise Agreement then in effect, together with 

  
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payment in full of the Exercise Price for the number of Shares being purchased and satisfaction of any applicable Tax-Related Obligations (as defined in
Section 8.2 hereof). 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 2.2 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. 

4.6 Termination. Subject to earlier termination pursuant to Sections 11 and 13.3 hereof and notwithstanding
the exercise periods set forth in the Stock Option Agreement, exercise of an Option will always be subject to the following terms and conditions. 

4.6.1 Other than Death or Disability or for Cause. If the Participant is Terminated for any reason other than death, Disability or for
Cause, then the Participant may exercise such Participant’s Options only to the extent that such Options are exercisable as to Vested Shares upon the Termination Date, except as otherwise determined by the Committee or required by applicable
law. Such Options must be exercised by the Participant, if at all, as to all or some of the Vested Shares calculated as of the Termination Date or such other date determined by the Committee, within three (3) months after the Termination Date
(or within such shorter time period, not less than thirty (30) days, or within such longer time period after the Termination Date as may be determined by the Committee or required by applicable law, with any exercise beyond three
(3) months after the date Participant ceases to be an employee deemed to be an NQSO) but, in any event, no later than the expiration date of the Options. 

4.6.2 Death or Disability. If the Participant is Terminated because of Participant’s death or Disability (or the Participant dies
within three (3) months after a Termination other than for Cause), then Participant’s Options may be exercised only to the extent that such Options are exercisable as to Vested Shares on the Termination Date, except as otherwise determined
by the Committee or required by applicable law. Such Options must be exercised by Participant (or Participant’s legal representative or authorized assignee), if at all, as to all or some of the Vested Shares calculated as of the Termination
Date or such other date determined by the Committee, within twelve (12) months after the Termination Date (or within such shorter time period, not less than six (6) months, or within such longer time period, after the Termination Date as
may be determined by the Committee or required by applicable law, with any exercise beyond (a) three (3) months after the date Participant ceases to be an employee when the Termination is for any reason other than the Participant’s
death or disability, within the meaning of Section 22(e)(3) of the Code, or (b) twelve (12) months after the date Participant ceases to be an employee when the Termination is for Participant’s disability, within the meaning of
Section 22(e)(3) of the Code, deemed to be an NQSO) but in any event no later than the expiration date of the Options. 
 4.6.3 For
Cause. If the Participant is Terminated for Cause, the Participant may exercise such Participant’s Options, but not to an extent greater than such Options are exercisable as to Vested Shares upon the Termination Date and Participant’s
Options shall expire on such Participant’s Termination Date, or at such later time and on such conditions as are determined by the Committee. 

  
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 4.7 Limitations on Exercise. The Committee may specify a
reasonable minimum number of Shares that may be purchased on any exercise of an Option, provided that such minimum number will not prevent Participant from exercising the Option for the full number of Shares for which it is then
exercisable. 
 4.8 Limitations on ISOs. The aggregate Fair Market Value (determined as of the date of grant) of
Shares with respect to which ISOs are exercisable for the first time by a Participant during any calendar year (under this Plan or under any other incentive stock option plan of the Company or any Parent or Subsidiary of the Company) will not exceed
One Hundred Thousand Dollars ($100,000). If the Fair Market Value of Shares on the date of grant with respect to which ISOs are exercisable for the first time by a Participant during any calendar year exceeds One Hundred Thousand Dollars ($100,000),
then the Options for the first One Hundred Thousand Dollars ($100,000) worth of Shares to become exercisable in such calendar year will be ISOs and the Options for the amount in excess of One Hundred Thousand Dollars ($100,000) that become
exercisable in that calendar year will be NQSOs. In the event that the Code or the regulations promulgated thereunder are amended after the Effective Date (as defined in Section 13.1 hereof) to provide for a different limit on the Fair Market
Value of Shares permitted to be subject to ISOs, then such different limit will be automatically incorporated herein and will apply to any Options granted after the effective date of such amendment. 

4.9 Modification, Extension or Renewal. The Committee may modify, extend or renew outstanding Options and authorize
the grant of new Options in substitution therefor, provided that any such action may not, without the written consent of a Participant, impair any of such Participant’s rights under any Option previously granted, unless for the
purpose of complying with applicable laws and regulations. Any outstanding ISO that is modified, extended, renewed or otherwise altered will be treated in accordance with Section 424(h) of the Code. Subject to Section 4.10 hereof, the
Committee may reduce the Exercise Price of outstanding Options without the consent of Participants by a written notice to them; provided, however, that the Exercise Price may not be reduced below the minimum Exercise
Price that would be permitted under Section 4.4 hereof for Options granted on the date the action is taken to reduce the Exercise Price. 

4.10 No Disqualification. Notwithstanding any other provision in this Plan, no term of this Plan relating to ISOs
will be interpreted, amended or altered, nor will any discretion or authority granted under this Plan be exercised, so as to disqualify this Plan under Section 422 of the Code or, without the consent of the Participant, to disqualify any
Participant’s ISO under Section 422 of the Code. 
 5. RESTRICTED STOCK. A Restricted Stock Award is an
offer by the Company to sell to an eligible person Shares that are subject to certain specified restrictions. The Committee will determine to whom an offer will be made, the number of Shares the person may purchase, the Purchase Price, the
restrictions to which the Shares will be subject, and all other terms and conditions of the Restricted Stock Award, subject to the following terms and conditions. 

  
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 5.1 Form of Restricted Stock Award. All purchases under a
Restricted Stock Award made pursuant to this Plan will be evidenced by an Award Agreement (“Restricted Stock Purchase Agreement”) that will be in such form (which need not be the same for each Participant) as the Committee
will from time to time approve, and will comply with and be subject to the terms and conditions of this Plan. The Restricted Stock Award will be accepted by the Participant’s execution and delivery of the Restricted Stock Purchase Agreement
(accepted via written, electronic or other means) and full payment for the Shares to the Company within thirty (30) days from the date the Restricted Stock Purchase Agreement is delivered to the person. If such person does not execute and
deliver the Restricted Stock Purchase Agreement along with full payment for the Shares to the Company within such thirty (30) days, then the offer will terminate, unless otherwise determined by the Committee. 

5.2 Purchase Price. The Purchase Price of Shares sold pursuant to a Restricted Stock Award will be determined by
the Committee on the date the Restricted Stock Award is granted. Payment of the Purchase Price must be made in accordance with Section 8 hereof. 

5.3 Dividends and Other Distributions. Participants holding Restricted Stock Awards will be entitled to receive all
dividends and other distributions paid with respect to such Shares, unless the Committee provides otherwise at the time the Award is granted. 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 Restricted Stock Awards with respect to which they were paid. 
 5.4
Restrictions. Restricted Stock Awards may be subject to the restrictions set forth in Sections 9 and 10 hereof or, with respect to a Restricted Stock Award to which Section 25102(o) is to apply, such other
restrictions not inconsistent with Section 25102(o). 
 6. RESTRICTED STOCK UNITS. 

6.1 Awards of Restricted Stock Units. A Restricted Stock Unit (“RSU”) is an Award covering
a number of Shares that may be settled in cash, by issuance of those Shares at a date in the future, or by a combination of cash and Shares. No Purchase Price shall apply to an RSU settled in Shares. All grants of RSUs will be evidenced by an Award
Agreement (the “RSU Agreement”) that will be in such form (which need not be the same for each Participant) as the Committee will from time to time approve, and will comply with and be subject to the terms and conditions of
this Plan. No RSU will have a term longer than ten (10) years from the date the RSU is granted. 
 6.2 Form and Timing of
Settlement. To the extent permissible under applicable law, the Committee may permit a Participant to defer payment (including settlement) under an RSU to a date or dates after the RSU has vested, provided that the terms
of the RSU and any deferral satisfy the requirements of Section 409A of the Code (or any successor) and any regulations or rulings promulgated thereunder, to the extent the Participant is subject to Section 409A of the Code. Payment may be
made in the form of cash or whole Shares or a combination thereof, all as the Committee determines. 

  
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 6.3 Dividend Equivalent Payments. The Board may permit
Participants holding RSUs to receive dividend equivalent payments on outstanding RSUs if and when dividends are paid to stockholders on Shares. In the discretion of the Board, such dividend equivalent payments may be paid in cash or Shares and
they may either be paid at the same time as dividend payments are made to stockholders or delayed until Shares are issued pursuant to the RSU grants and may be subject to the same vesting or performance requirements as the RSUs. If the Board
permits dividend equivalent payments to be made on RSUs, the terms and conditions for such dividend equivalent payments will be set forth in the RSU Agreement. 

7. STOCK APPRECIATION RIGHTS. 

7.1 Awards of SARs. Stock Appreciation Rights (“SARs”) may be settled in cash or Shares
(which may consist of Restricted Stock or RSUs) or a combination thereof, having a value equal to the value determined by multiplying the difference between the Fair Market Value on the date of exercise over the Exercise Price and the number of
Shares with respect to which the SAR is being exercised. All grants of SARs made pursuant to this Plan will be evidenced by an Award Agreement (the “SAR Agreement”) that will be in such form (which need not be the same for
each Participant) as the Committee will from time to time approve, and will comply with and be subject to the terms and conditions of this Plan. 

7.2 Exercise Period and Expiration Date. A SAR will be exercisable within the times or upon the occurrence of
events determined by the Committee and set forth in the SAR Agreement. The SAR Agreement shall set forth the expiration date; provided that no SAR will be exercisable after the expiration of ten (10) years from the date the SAR is
granted. 
 7.3 Exercise Price. The Committee will determine the Exercise Price of the SAR when the SAR is
granted, which may not be less than the Fair Market Value on the date of grant. 
 7.4 Termination. Subject to
earlier termination pursuant to Sections 11 and 13 hereof and notwithstanding the exercise periods set forth in the SAR Agreement, exercise of SARs will always be subject to the following terms and conditions. 

7.4.1 Other than Death or Disability or for Cause. If the Participant is Terminated for any reason other than death, Disability or for
Cause, then the Participant may exercise such Participant’s SARs only to the extent that such SARs are exercisable as to Vested Shares upon the Termination Date or as otherwise determined by the Committee or as required by applicable law. SARs
must be exercised by the Participant, if at all, as to all or some of the Vested Shares calculated as of the Termination Date or such other date determined by the Committee, within three (3) months after the Termination Date (or within such
shorter time period, not less than thirty (30) days, or within such longer time period after the Termination Date as may be determined by the Committee or as required by applicable law), but in any event no later than the expiration date of the
SARs. 
 7.4.2 Death or Disability. If the Participant is Terminated because of Participant’s death or Disability (or the
Participant dies within three (3) months after a Termination other than for Cause), then Participant’s SARs may be exercised only to the extent that such SARs are exercisable as to Vested Shares on the Termination Date or as otherwise
determined by the Committee or as required by applicable law. Such SARs must be exercised by 

  
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Participant (or Participant’s legal representative or authorized assignee), if at all, as to all or some of the Vested Shares calculated as of the Termination Date or such other date
determined by the Committee, within twelve (12) months after the Termination Date (or within such shorter time period, not less than six (6) months, or within such longer time period after the Termination Date as may be determined by the
Committee or as required by applicable law), but in any event no later than the expiration date of the SARs. 
 7.4.3 For Cause. If
the Participant is Terminated for Cause, the Participant may exercise such Participant’s SARs, but not to an extent greater than such SARs are exercisable as to Vested Shares upon the Termination Date and Participant’s SARs shall expire on
such Participant’s Termination Date, or at such later time and on such conditions as are determined by the Committee. 
 8.
PAYMENT FOR PURCHASES AND EXERCISES. 
 8.1 Payment in General. Payment for Shares acquired pursuant
to this Plan may be made in cash equivalents (including by check or Automated Clearing House (“ACH”) transfer) or, where expressly approved for the Participant by the Committee and subject to compliance with applicable law:

 (a) by cancellation of indebtedness of the Company owed to the Participant; 

(b) by surrender of shares of the Company that are clear of all liens, claims, encumbrances or security interests and: (i) for which the
Company has received “full payment of the purchase price” within the meaning of SEC Rule 144 (and, if such shares were purchased from the Company by use of a promissory note, such note has been fully paid with respect to such shares)
or (ii) that were obtained by Participant in the public market; 
 (c) by tender of a full recourse promissory note having such terms
as may be approved by the Committee and bearing interest at a rate sufficient to avoid (i) imputation of income under Sections 483 and 1274 of the Code and (ii) unfavorable accounting treatment as determined by the Committee;
provided, however, that Participants who are not employees or directors of the Company will not be entitled to purchase Shares with a promissory note unless the note is adequately secured by collateral other than the
Shares; provided, further, that the portion of the Exercise Price or Purchase Price, as the case may be, equal to the par value (if any) of the Shares must be paid in cash or other legal consideration permitted by the
laws under which the Company is then incorporated or organized; 
 (d) by waiver of compensation due or accrued to the Participant from the
Company for services rendered; 
 (e) by participating in a formal cashless exercise program implemented by the Committee in connection with
the Plan; 
 (f) provided that a public market for the Company’s common stock exists, by exercising through a “same day sale”
commitment from the Participant and a broker-dealer whereby the Participant irrevocably elects to exercise the Award and to sell a portion of the Shares so purchased sufficient to pay the total Exercise Price or Purchase Price, and whereby the
broker-dealer irrevocably commits upon receipt of such Shares to forward the total Exercise Price or Purchase Price directly to the Company; or 

  
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 (g) by any combination of the foregoing or any other method of payment approved by the
Committee. 
 For avoidance of uncertainty: ACH transfers that have been received by the Company into its bank account designated for receipt of such
transfers under this Section 8.1 shall be deemed to have been received for all purposes under this Plan as of the date on which such transfers were initiated from the transferor’s account and made irrevocable by the transferor. 

8.2 Withholding Taxes. 

8.2.1 Withholding Generally. Whenever Shares are to be issued in satisfaction of Awards granted under this Plan, the Company may
require the Participant to remit to the Company an amount sufficient to satisfy the maximum tax withholding requirements as to income tax, social insurance, payroll tax, fringe benefits tax, payment on account and other tax-related obligations (collectively, “Tax-Related Obligations”) prior to the delivery of any written or electronic certificate or certificates for
such Shares. Whenever, under this Plan, payments in satisfaction of Awards are to be made in cash by the Company, such payment will be net of an amount sufficient to satisfy applicable tax withholding requirements. 

8.2.2 Stock Withholding. When, under applicable tax laws, a Participant incurs tax liability in connection with the exercise or vesting
of any Award that is subject to tax withholding and the Participant is obligated to pay the Company the amount required to be withheld, the Committee may in its sole discretion allow the Participant to satisfy up to the maximum Tax-Related Obligations in the employee’s applicable jurisdictions by electing to have the Company withhold from the Shares to be issued up to the number of Shares having a Fair Market Value on the date that
the amount of tax to be withheld is to be determined that is not more than the maximum Tax-Related Obligations in the employee’s applicable jurisdictions; or to arrange a mandatory “sell to
cover” on Participant’s behalf (without further authorization) but in no event will the Company withhold Shares or “sell to cover” if such withholding would result in adverse accounting or compliance consequences to the Company.
The maximum Tax-Related Obligations are based on the applicable rates of the relevant tax authorities (for example, federal, state and local), including the employee’s share of payroll or similar taxes,
as provided in the tax law, regulations or the authority’s administrative practices, not to exceed the highest statutory rate in that jurisdiction. Any elections to have Shares withheld or sold for this purpose will be made in accordance with
the requirements established by the Committee for such elections and be in writing in a form acceptable to the Committee. 
 9.
RESTRICTIONS ON AWARDS. 
 9.1 Transferability. Except as permitted by the Committee, Awards granted
under this Plan, and any interest therein, will not be transferable or assignable by Participant, other than by will or by the laws of descent and distribution, and, with respect to NQSOs for Participants in the U.S., by instrument to an inter vivos
or testamentary trust in which the 

  
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NQSOs are to be passed to beneficiaries upon the death of the trustor (settlor), or by gift to “family member” as that term is defined in Rule 701, and may not be made subject to
execution, attachment or similar process. For the avoidance of doubt, the prohibition against assignment and transfer applies to Awards and any Shares underlying the Awards prior to the issuance of the Shares, and pursuant to the foregoing sentence
shall be understood to include, without limitation, a prohibition against any pledge, hypothecation, or other transfer, including any short position, any “put equivalent position” or any “call equivalent position” (in each case,
as defined in Rule 16a-1 promulgated under the Exchange Act). Unless an Award is transferred pursuant to the terms of this Section, during the lifetime of the Participant an Award will be exercisable only by
the Participant or Participant’s legal representative and any elections with respect to an Award may be made only by the Participant or Participant’s legal representative. The terms of an Award shall be binding upon the executor,
administrator, successors and assigns of the Participant who is a party thereto. 
 9.2 Securities Law and Other Regulatory
Compliance. Although this Plan is intended to be a written compensatory benefit plan within the meaning of Rule 701 promulgated under the Securities Act, Awards may be made pursuant to this Plan that do not qualify for exemption
under Rule 701 or Section 25102(o). Any requirement of this Plan which is required in law only because of Section 25102(o) need not apply with respect to a particular Award to which Section 25102(o) will not apply. An Award will not
be effective unless such Award is in compliance with all applicable U.S. and non-U.S. federal, state and local securities laws, rules and regulations of any governmental body, and the requirements of any stock
exchange or automated quotation system upon which the Company’s equity securities may then be listed or quoted, as they are in effect on the date of grant of the Award and also on the date of exercise, settlement or other issuance.
Notwithstanding any other provision in this Plan, the Company will have no obligation to issue Shares or deliver certificates for Shares under this Plan prior to (a) obtaining any approvals from governmental agencies that the Company determines
are necessary or advisable, and/or (b) compliance with any exemption, completion of any registration or other qualification of such Shares under any U.S. and non-U.S. federal, state or local law or ruling
of any governmental body that the Company determines to be necessary or advisable. The Company will be under no obligation to register the Shares with the SEC or to effect compliance with the exemption, registration, qualification or listing
requirements of any securities laws, stock exchange or automated quotation system, and the Company will have no liability for any inability or failure to do so. 

9.3 Exchange and Buyout of Awards. The Committee may, at any time or from time to time, authorize the Company, with
the consent of the respective Participants, to issue new Awards in exchange for the surrender and cancellation of any or all outstanding Awards. Without prior stockholder approval the Committee may reprice Options or SARs (and where such repricing
is a reduction in the Exercise Price of outstanding Options or SARs, the consent of the affected Participants is not required provided written notice is provided to them). The Committee may at any time buy from a Participant an Award previously
granted with payment in cash, Shares (including Restricted Stock) or other consideration, based on such terms and conditions as the Committee and the Participant may agree. 

  
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 10. RESTRICTIONS ON SHARES. 

10.1 Privileges of Stock Ownership. No Participant will have any of the rights of a stockholder with respect to any
Shares until such Shares are issued to the Participant. After Shares are issued to the Participant, the Participant will be a stockholder and have all the rights of a stockholder with respect to such Shares, including the right to vote and receive
all dividends or other distributions made or paid with respect to such Shares; provided, that if such Shares are Restricted Stock, then any new, additional or different securities the Participant may become entitled to receive with
respect to such Shares by virtue of a stock dividend, stock split or any other change in the corporate or capital structure of the Company will be subject to the same restrictions as the Restricted Stock. The Participant will have no right to retain
such stock dividends or stock distributions with respect to Unvested Shares that are repurchased as described in this Section 10. 

10.2 Rights of First Refusal and Repurchase. At the discretion of the Committee, the Company may reserve to itself
and/or its assignee(s) in the Award Agreement (a) a right of first refusal to purchase all Shares that a Participant (or a subsequent transferee) may propose to transfer to a third party, provided that such right of first refusal
terminates upon (i) subject to any applicable market standoff restrictions, the effective date of the first sale of common stock of the Company to the general public pursuant to a registration statement filed with and declared effective
by the SEC under the Securities Act (other than a registration statement relating solely to the issuance of common stock pursuant to a business combination or an employee incentive or benefit plan); (ii) any transfer or conversion of Shares made
pursuant to a statutory merger or statutory consolidation of the Company with or into another corporation or corporations if the common stock of the surviving corporation or any direct or indirect Parent thereof is registered under the
Exchange Act; or (iii) any transfer or conversion of Shares made pursuant to a statutory conversion of the Company into another form of legal entity if the common equity (or comparable equity security) of entity resulting from such
conversion is registered under the Exchange Act; and (b) a right to repurchase Unvested Shares held by a Participant for cash and/or cancellation of purchase money indebtedness owed to the Company by the Participant following such
Participant’s Termination at any time. 
 10.3 Agreement to Vote Shares. At the discretion of the Committee,
the Company may require that, as a condition to the receipt of the Shares upon issuance of an Award, exercise of an Option or SAR or settlement of an RSU, the Participant and any transferee of the Shares agree to vote such Shares pursuant to the
terms of a Voting Agreement by and between the Company and certain of its stockholders. 
 10.4 Escrow; Pledge of
Shares. To enforce any restrictions on a Participant’s Shares, the Committee may require the Participant to deposit all written or electronic certificates representing Shares, together with stock powers or other instruments of
transfer approved by the Committee, appropriately endorsed in blank, with the Company or an agent designated by the Company to hold in escrow until such restrictions have lapsed or terminated. The Committee may cause a legend or legends referencing
such restrictions to be placed on the written or electronic certificate. Any Participant who is permitted to execute a promissory note as partial or full consideration for the purchase of Shares under this Plan will be required to pledge and deposit
with the Company all or part of the Shares so purchased as collateral to secure the 

  
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payment of Participant’s obligation to the Company under the promissory note; provided, however, that the Committee may require or accept other or additional
forms of collateral to secure the payment of such obligation and, in any event, the Company will have full recourse against the Participant under the promissory note notwithstanding any pledge of the Participant’s Shares or other collateral. In
connection with any pledge of the Shares, Participant will be required to execute and deliver a written pledge agreement in such form as the Committee will from time to time approve. The Shares purchased with the promissory note may be released from
the pledge on a pro rata basis as the promissory note is paid. 
 10.5 Securities Law Restrictions. All written
or electronic certificates for Shares or other securities delivered under this Plan will be subject to such stock transfer orders, legends and other restrictions as the Committee may deem necessary or advisable, including restrictions under any
applicable U.S. and non-U.S. federal, state or local securities law, or any rules, regulations and other requirements of the SEC or any stock exchange or automated quotation system upon which the
Company’s equity securities may be listed or quoted. 
 11. CORPORATE TRANSACTIONS. 

11.1 Acquisitions or Other Combinations. In the event that the Company is subject to an Acquisition or Other
Combination, outstanding Awards acquired under the Plan shall be subject to the agreement evidencing the Acquisition or Other Combination, which need not treat all outstanding Awards in an identical manner. Such agreement, without the
Participant’s consent, shall provide for one or more of the following with respect to all outstanding Awards as of the effective date of such Acquisition or Other Combination: 

(a) The continuation of such outstanding Awards by the Company (if the Company is the successor entity). 

(b) The assumption of outstanding Awards by the successor or acquiring entity (if any) in such Acquisition or Other Combination (or by any of
its Parents, if any), which assumption, will be binding on all Participants; provided that the exercise price and the number and nature of shares issuable upon exercise of any such option or stock appreciation right, or upon the settlement of any
award that is subject to Section 409A of the Code, will be adjusted appropriately pursuant to Section 424(a) and Section 409A of the Code. For the purposes of this Section 11, an Award will be considered assumed if, following the
Acquisition or Other Combination, the Award confers the right to purchase or receive, for each Share subject to the Award immediately prior to the Acquisition or Other Combination, the consideration (whether stock, cash, or other securities or
property) received in the Acquisition or Other Combination by holders of Shares 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 Acquisition or Other Combination is not solely common stock of the successor corporation or its Parent, the Committee 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 settlement of an RSU, 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 Acquisition or Other Combination. 

  
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 (c) The substitution by the successor or acquiring entity in such Acquisition or Other
Combination (or by any of its Parents, if any) of equivalent awards with substantially the same terms for such outstanding Awards (except that the exercise price and the number and nature of shares issuable upon exercise of any such option or stock
appreciation right, or any award that is subject to Section 409A of the Code, will be adjusted appropriately pursuant to Section 424(a) and Section 409A of the Code). 

(d) The full or partial exercisability or vesting and accelerated expiration of outstanding Awards. 

(e) The settlement of the Fair Market Value of such outstanding Award (whether or not then vested or exercisable) in cash, cash equivalents,
or securities of the successor entity (or its Parent, if any), followed by the cancellation of such Awards; provided however, that such Award may be cancelled without consideration if such Award has no value, as determined by the Committee, in its
discretion. Subject to Section 409A of the Code, such payment may be made in installments and may be deferred until the date or dates when the Award would have become exercisable or vested. Such payment may be subject to vesting based on the
Participant’s continued service, provided that without the Participant’s consent, the vesting schedule shall not be less favorable to the Participant than the schedule under which the Award would have become vested or exercisable. For
purposes of this Section 11.1(e), the Fair Market Value of any security shall be determined without regard to any vesting conditions that may apply to such security. 

(f) The termination in its entirety of any outstanding Award, without payment of any consideration, that is not exercised in accordance with
its terms upon or prior to consummation of the transactions contemplated by the Acquisition or Other Combination within a time specified by the Committee, in its discretion, for such exercise, whether or not such Award is then fully exercisable.

 Immediately following an Acquisition or Other Combination, outstanding Awards shall terminate and cease to be outstanding, except to the
extent such Awards, have been continued, assumed or substituted, as described in Sections 11.1(a), (b) and/or (c). 
 11.2
Assumption of Awards by the Company. The Company, from time to time, also may substitute or assume outstanding awards granted by another entity, whether in connection with an acquisition of such other entity or otherwise, by
either (a) granting an Award under this Plan in substitution of such other entity’s award or (b) assuming and/or converting such award as if it had been granted under this Plan if the terms of such assumed award could be applied to an
Award granted under this Plan. Such substitution or assumption will be permissible if the holder of the substituted or assumed award would have been eligible to be granted an Award under this Plan if the other entity had applied the rules of this
Plan to such grant. In the event the Company assumes an award granted by another entity, the terms and conditions of such award will remain unchanged (except that the exercise price and the number and nature of shares issuable upon exercise of any
such option or stock appreciation right, or any 

  
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award that is subject to Section 409A of the Code, will be adjusted appropriately pursuant to Section 424(a) of the Code). In the event the Company elects to grant a new Option or SAR
in substitution for and rather than assuming an existing option or stock appreciation right, such new Option or SAR may be granted with a similarly adjusted Exercise Price and number of underlying Shares and such other changes approved by the
Committee, subject to the consent of the Participant. 
 12. ADMINISTRATION. 

12.1 Committee Authority. This Plan will be administered by the Committee. Subject to the general purposes, terms
and conditions of this Plan, and to the direction of the Board, the Committee will have full power to implement and carry out this Plan. Without limitation, the Committee will have the authority to: 

(a) construe and interpret this Plan, any Award Agreement and any other agreement or document executed pursuant to this Plan; 

(b) prescribe, amend, expand, modify and rescind or terminate rules and regulations relating to this Plan; 

(c) approve persons to receive Awards; 

(d) determine the form and terms of Awards; 

(e) determine the number of Shares or other consideration subject to Awards granted under this Plan; 

(f) determine the Fair Market Value in good faith and interpret the applicable provisions of this Plan and the definition of Fair Market Value
in connection with circumstances that impact the Fair Market Value, if necessary; 
 (g) determine whether Awards will be granted singly, in
combination with, in tandem with, in replacement of, or as alternatives to, other Awards under this Plan or awards under any other incentive or compensation plan of the Company or any Parent or Subsidiary of the Company; 

(h) grant waivers of any conditions of this Plan or any Award; 

(i) determine the terms of vesting, exercisability, settlement and payment of Awards to be granted pursuant to this Plan; 

(j) correct any defect, supply any omission, or reconcile any inconsistency in this Plan, any Award, any Award Agreement or any Exercise
Agreement; 
 (k) determine whether an Award has vested or become exercisable; 

(l) extend the vesting period beyond a Participant’s Termination Date; 

  
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 (m) adopt rules and/or procedures (including the adoption of any subplan under this Plan)
relating to the operation and administration of the Plan to accommodate or facilitate requirements of local law and procedures outside of the United States; 

(n) delegate any of the foregoing to a subcommittee consisting of one or more directors or executive officers pursuant to a specific
delegation as may otherwise be permitted by applicable law; 
 (o) change the vesting schedule of Awards under the Plan prospectively in the
event that the Participant’s service status changes between full and part time status in accordance with Company policies relating to work schedules and vesting of Awards; and 

(p) make all other determinations necessary or advisable in connection with the administration of this Plan. 

12.2 Standalone, Tandem and Substitute Awards. Awards granted under the Plan may, in the sole discretion of the
Committee, be granted either alone or in addition to, in tandem with, or in substitution for, any other Award granted under the Plan. Awards granted in addition to or in tandem with other Awards may be granted either at the same time as or at a
different time from the grant of such other Awards. 
 12.3 Committee Composition and Discretion. The Board may
delegate full administrative authority over the Plan and Awards to a Committee consisting of at least one member of the Board (or such greater number as may then be required by applicable law). Unless in contravention of any express terms of
this Plan or Award, any determination made by the Committee with respect to any Award will be made in its sole discretion either (a) at the time of grant of the Award, or (b) subject to Section 4.9 hereof, at any later time. Any such
determination will be final and binding on the Company and on all persons having an interest in any Award under this Plan. To the extent permitted by applicable law, the Committee may delegate to one or more directors or officers of the Company the
authority to grant an Award under this Plan. 
 12.4 Nonexclusivity of the Plan. Neither the adoption of this
Plan by the Board, the submission of this Plan to the stockholders of the Company for approval, nor any provision of this Plan will be construed as creating any limitations on the power of the Board to adopt such additional compensation arrangements
as it may deem desirable, including, without limitation, the granting of stock options and other equity awards otherwise than under this Plan, and such arrangements may be either generally applicable or applicable only in specific cases. 

12.5 Governing Law. This Plan and all agreements hereunder shall be governed by and construed in accordance with
the laws of the State of California, without giving effect to that body of laws pertaining to conflict of laws. 

  
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 13. EFFECTIVENESS, AMENDMENT AND TERMINATION OF THE PLAN. 

13.1 Adoption and Stockholder Approval. This Plan will become effective on the date that it is adopted by the Board
(the “Effective Date”). This Plan will be approved by the stockholders of the Company (excluding Shares issued pursuant to this Plan), consistent with applicable laws, within twelve (12) months before or after the
Effective Date. Upon the Effective Date, the Committee may grant Awards pursuant to this Plan; provided, however, that: (a) no Option or SAR may be exercised prior to initial stockholder approval of this Plan;
(b) no Option or SAR granted pursuant to an increase in the number of Shares approved by the Board shall be exercised prior to the time such increase has been approved by the stockholders of the Company; (c) in the event that initial
stockholder approval is not obtained within the time period provided herein, all Awards for which only the exemption from California’s securities qualification requirements provided by Section 25102(o) can apply shall be canceled, any
Shares issued pursuant to any such Award shall be canceled and any purchase of such Shares issued hereunder shall be rescinded; and (d) Awards (to which only the exemption from California’s securities qualification requirements provided by
Section 25102(o) can apply) granted pursuant to an increase in the number of Shares approved by the Board which increase is not approved by stockholders within the time then required under Section 25102(o) shall be canceled, any Shares
issued pursuant to any such Awards shall be canceled, and any purchase of Shares subject to any such Award shall be rescinded. 
 13.2
Term of Plan. Unless earlier terminated as provided herein, this Plan will automatically terminate ten (10) years after the Effective Date. 

13.3 Amendment or Termination of Plan. Subject to Section 4.9 hereof, the Board may at any time
(a) terminate or amend this Plan in any respect, including without limitation amendment of any form of Award Agreement or instrument to be executed pursuant to this Plan and (b) terminate any and all outstanding Options, SARs or RSUs upon
a dissolution or liquidation of the Company, followed by the payment of creditors and the distribution of any remaining funds to the Company’s stockholders; provided, however, that the Board will not, without the
approval of the stockholders of the Company, amend this Plan in any manner that requires such stockholder approval pursuant to Section 25102(o) or pursuant to the Code or the regulations promulgated under the Code as such provisions apply to
ISO plans. The termination of the Plan, or any amendment thereof, shall not affect any Share previously issued or any Award previously granted under the Plan. 

14. DEFINITIONS. For all purposes of this Plan, the following terms will have the following meanings. 

“Acquisition,” for purposes of Section 11, means: 

(a) any consolidation or merger in which the Company is a constituent entity or is a party in which the voting stock and other voting
securities of the Company that are outstanding immediately prior to the consummation of such consolidation or merger represent, or are converted into, securities of the surviving entity of such consolidation or merger (or of any Parent of such
surviving entity) that, immediately after the consummation of such consolidation or merger, together possess less than fifty percent (50%) of the total voting power of all voting securities of such surviving entity (or of any of its Parents, if any)
that are outstanding immediately after the consummation of such consolidation or merger; 

  
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 (b) a sale or other transfer by the holders thereof of outstanding voting stock and/or
other voting securities of the Company possessing more than fifty percent (50%) of the total voting power of all outstanding voting securities of the Company, whether in one transaction or in a series of related transactions, pursuant to an
agreement or agreements to which the Company is a party and that has been approved by the Board, and pursuant to which such outstanding voting securities are sold or transferred to a single person or entity, to one or more persons or entities who
are Affiliates of each other, or to one or more persons or entities acting in concert; or 
 (c) the sale, lease, transfer or other
disposition, in a single transaction or series of related transactions, by the Company and/or any Subsidiary or Subsidiaries of the Company, of all or substantially all the assets of the Company and its Subsidiaries taken as a whole (or, if
substantially all of the assets of the Company and its Subsidiaries taken as a whole are held by one or more Subsidiaries, the sale or disposition (whether by consolidation, merger, conversion or otherwise) of such Subsidiaries of the Company),
except where such sale, lease, transfer or other disposition is made to the Company or one or more wholly owned Subsidiaries of the Company. 

Notwithstanding the foregoing, the following transactions shall not constitute an “Acquisition”: (1) the closing of the Company’s first public
offering pursuant to an effective registration statement filed under the Securities Act or (2) any transaction the sole purpose of which is to change the state of incorporation of the Company or 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. 

“Affiliate” of a specified person means a person that directly, or indirectly through one or more
intermediaries, controls or is controlled by, or is under common control with, the person specified (where, for purposes of this definition, the term “control” (including the terms
“controlling,” “controlled by” and “under common control with”) means the possession, direct or indirect, of the power to direct or cause the direction of the management and
policies of a person, whether through the ownership of voting securities, by contract, or otherwise. 
 “Award”
means any award pursuant to the terms and conditions of this Plan, including any Option, Restricted Stock Unit, Stock Appreciation Right or Restricted Stock Award. 

“Award Agreement” means, with respect to each Award, the executed written or electronic agreement between the Company
and the Participant setting forth the terms and conditions of the Award as approved by the Committee. For purposes of the Plan, the Award Agreement may be accepted by a Participant via written, electronic or other means, subject to requirements
under applicable law. 
 “Board” means the Board of Directors of the Company. 

  
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 “Cause” means Termination because of (a) Participant’s
unauthorized misuse of the Company or a Parent or Subsidiary of the Company’s trade secrets or proprietary information, (b) Participant’s conviction of or plea of nolo contendere to a felony or a crime involving moral turpitude,
(c) Participant’s committing an act of fraud against the Company or a Parent or Subsidiary of the Company or (d) Participant’s gross negligence or willful misconduct in the performance of his or her duties that has had or will
have a material adverse effect on the Company or Parent or Subsidiary of the Company’ reputation or business. 

“Code” means the U.S. Internal Revenue Code of 1986, as amended. 

“Committee” means the committee created and appointed by the Board to administer this Plan, or if no committee is
created and appointed, the Board. 
 “Company” means Lyell Immunopharma, Inc., or any successor corporation. 

“Disability” means a Participant is unable to perform the duties of his or her customary position of employment by
reason of any medically determinable physical or mental impairment that can be expected to result in death or that can be expected to last for a continuous period of not less than twelve (12) months. The Committee may require such medical or
other evidence as it deems necessary to judge the nature and permanency of the Participant’s condition. 
 “Exchange
Act” means the U.S. Securities Exchange Act of 1934, as amended. 
 “Exercise Price” means the price
per Share at which a holder of an Option or a SAR may purchase Shares issuable upon exercise of the Option or the SAR. 
 “Fair
Market Value” means, as of any date, the value of a Share determined as follows: 
 (a) if such Share is then publicly traded
on a national securities exchange, its closing price on the date of determination on the principal national securities exchange on which the Share is listed or admitted to trading as reported in The Wall Street Journal; 

(b) if such Share is publicly traded but is not listed or admitted to trading on a national securities exchange, the average of the closing
bid and ask prices on the date of determination as reported by The Wall Street Journal (or as otherwise reported by any newspaper or other source as the Committee may determine); or 

(c) if none of the foregoing is applicable to the valuation in question, by the Committee in good faith. 

“Option” means an award of an option to purchase Shares pursuant to Section 4 of this Plan. 

“Other Combination” for purposes of Section 11 means any (a) consolidation or merger in which the Company is
a constituent entity and is not the surviving entity of such consolidation or merger or (b) any conversion of the Company into another form of entity; provided that such consolidation, merger or conversion does not constitute an
Acquisition. 

  
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 “Parent” of a specified entity means, any entity that, either
directly or indirectly, owns or controls such specified entity, where for this purpose, “control” means the ownership of stock, securities or other interests that possess at least a majority of the voting power of such
specified entity (including indirect ownership or control of such stock, securities or other interests). 

“Participant” means a person who receives an Award under this Plan. 

“Plan” means this 2018 Equity Incentive Plan, as amended from time to time. 

“Purchase Price” means the price at which a Participant may purchase Restricted Stock pursuant to this Plan. 

“Restricted Stock” means Shares purchased pursuant to a Restricted Stock Award under this Plan. 

“Restricted Stock Award” means an award of Shares pursuant to Section 5 hereof. 

“Restricted Stock Unit” or “RSU” means an award made pursuant to Section 6 hereof. 

“Rule 701” means Rule 701 et seq. promulgated by the SEC under the Securities Act. 

“SEC” means the U.S. Securities and Exchange Commission. 

“Section 25102(o)” means Section 25102(o) of the California Corporations Code.

 “Securities Act” means the U.S. Securities Act of 1933, as amended. 

“Shares” means shares of the Company’s Common Stock reserved for issuance under this Plan, as adjusted pursuant
to Sections 2.2 and 11 hereof, and any successor security. 
 “Stock Appreciation Right” or
“SAR” means an award granted pursuant to Section 7 hereof. 
 “Subsidiary” means any
entity (other than the Company) in an unbroken chain of entities beginning with the Company if each of the entities other than the last entity in the unbroken chain owns stock or other equity securities representing fifty percent (50%) or more of
the total combined voting power of all classes of stock or other equity securities in one of the other entities in such chain. 

“Termination” or “Terminated” means, for purposes of this Plan with respect to a Participant,
that the Participant has for any reason ceased to provide services as an employee, officer, director or consultant to the Company or a Parent or Subsidiary of the Company. A Participant will not be deemed to have ceased to provide services while the
Participant is on a bona fide leave of absence, if such leave was approved by the Company in writing. In the case of an approved leave of absence, the Committee may make such provisions respecting crediting


  
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of service, including suspension of vesting of the Award (including pursuant to a formal policy adopted from time to time by the Company) it may deem appropriate. The Committee will have sole
discretion to determine whether a Participant has ceased to provide services and the effective date on which the Participant ceased to provide services (the “Termination Date”). 

“Unvested Shares” means “Unvested Shares” as defined in the Award Agreement for an Award. 

“Vested Shares” means “Vested Shares” as defined in the Award Agreement for an Award. 

* * * * * * * * * * * 

  
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