Document:

EX-10.2

 Exhibit 10.2 

GOSSAMER BIO, INC. 

2017 EQUITY INCENTIVE PLAN 

STOCK OPTION GRANT NOTICE AND 

STOCK OPTION AGREEMENT 

Gossamer Bio, Inc. (the “Company”), pursuant to its 2017 Equity Incentive Plan (as amended from time
to time, the “Plan”), hereby grants to Participant an Option to purchase the number of shares of the Company’s Common Stock (referred to herein as “Shares”) set forth below. This Option is subject
to all of the terms and conditions as set forth herein and in the Stock Option Agreement attached hereto as Exhibit A (the “Agreement”) and the Plan, each of which is incorporated herein by reference. Unless otherwise
defined herein, the terms defined in the Plan shall have the same defined meanings in this Stock Option Grant Notice (“Grant Notice”) and the Agreement. 

 

			
		
	Participant:	  	 [Insert Participant Name]

		
	Grant Date:	  	 [Insert Grant Date]

		
	Vesting Commencement Date:	  	 [Insert Vesting Commencement Date]

		
	Exercise Price per Share:	  	 $[Insert Exercise Price Per Share]

		
	Total Exercise Price:	  	 $[Insert Aggregate Exercise Price on Grant Date]

		
	Total Number of Shares Subject to Option:	  	 [Insert Number of Shares]

		
	Expiration Date:	  	 [Insert Tenth Anniversary of Grant Date]

		
	Type of Option:	  	 ☐ Incentive Stock Option        ☐
Non-Qualified Stock Option

		
	Vesting Schedule:	  	 [To be specified in individual agreements.]

 By his or her signature and the Company’s signature below, Participant agrees to be bound
by the terms and conditions of the Plan, the Agreement and this Grant Notice. Participant has reviewed the Agreement, the Plan and this Grant Notice in their entirety, has had an opportunity to obtain the advice of counsel prior to executing this
Grant Notice and fully understands all provisions of this Grant Notice, the Agreement and the Plan. Participant hereby agrees to accept as binding, conclusive and final all decisions or interpretations of the Administrator of the Plan upon any
questions arising under the Plan or the Agreement. 
  

									
	GOSSAMER BIO, INC.	 		 	PARTICIPANT
					
	By:	 	 	 		 	By:	 	 
					
	 Print Name:
	 	 	 		 	 Print Name:
	 	 
					
	 Title:
	 	 	 		 	State of Residence:	 	 

 EXHIBIT A 

TO STOCK OPTION GRANT NOTICE 

STOCK OPTION AGREEMENT 

Pursuant to the Grant Notice to which this Agreement is attached, the Company has granted to Participant an Option under the
Plan to purchase the number of Shares indicated in the Grant Notice. 
 1.    Grant of
Option. In consideration of Participant’s past and/or continued employment with or service to the Company or a parent or subsidiary of the Company and for other good and valuable consideration, effective as of the Grant Date set forth
in the Grant Notice, the Company irrevocably grants to Participant an Option to purchase any part or all of an aggregate of the number of Shares set forth in the Grant Notice at the Exercise Price per Share set forth in the Grant Notice, upon the
terms and conditions set forth in the Plan and this Agreement. Unless designated as a Non-Qualified Stock Option in the Grant Notice, the Option shall be an Incentive Stock Option to the maximum extent
permitted by law. 
 2.    Vesting. The Option shall become vested and exercisable in such
amounts and at such times as are set forth in the vesting schedule in the Grant Notice (the “Vesting Schedule”), except that any Share as to which the Option would be fractionally vested will be accumulated and will vest and
become exercisable only when a whole Share has accumulated. The installments provided for in the vesting schedule are cumulative. Unless otherwise determined by the Administrator, any portion of the Option that has not become vested and exercisable
on or prior to the date Participant incurs a Termination of Service shall be forfeited on the date of Participant’s Termination of Service and shall not thereafter become vested, except as may be otherwise provided by the Administrator or as
set forth in another written agreement between the Company and Participant. 

3.    Exercise. 

(a)    Duration of Exercisability. Any vested portion of the Option may be exercised in whole or in
part at any time prior to the time when the Option or portion thereof becomes unexercisable under Section 4. 

(b)    Person Eligible to Exercise. During the lifetime of Participant, only Participant may
exercise the Option or any portion thereof. After the death of Participant, any exercisable portion of the Option may, prior to the time when the Option becomes unexercisable under Section 4, be exercised by Participant’s personal
representative or by any person empowered to do so under the deceased Participant’s will or under the then Applicable Laws of descent and distribution. 

(c)    Manner of Exercise. The Option, or any exercisable portion thereof, may be exercised solely
by delivery to the Secretary of the Company or the Secretary’s office, or such other place as may be determined by the Administrator, of all of the following prior to the time when the Option or such portion thereof becomes unexercisable under
Section 4: 
 (i)    An exercise notice in substantially in the form attached as
Exhibit B to the Grant Notice (or such other form as is prescribed by the Administrator, which may be an electronic form) (the “Exercise Notice”) signed by Participant or any other person then entitled to exercise the
Option or portion thereof, stating that the Option or portion thereof is thereby exercised, such Exercise Notice complying with all applicable rules established by the Administrator; and 

  
 A-1 

 (ii)    Subject to Section 5(f) of
the Plan, full payment for the Shares with respect to which the Option or portion thereof is exercised by: 

(A)    Cash, wire transfer of immediately available funds or check, payable to the order
of the Company; or 
 (B)    With the consent of the Administrator, surrendering shares
of Common Stock then issuable upon exercise of the Option valued at their Fair Market Value on the date of exercise; or 

(C)    If the Company is a Publicly Listed Company, unless the Administrator otherwise
determines, through the (A) delivery of an irrevocable and unconditional undertaking by a broker acceptable to the Company to deliver promptly to the Company sufficient funds to pay the exercise price, or (B) delivery by the Participant to
the Company of a copy of irrevocable and unconditional instructions to a broker acceptable to the Company to deliver promptly to the Company cash or a check sufficient to pay the exercise price, provided in either case, that such amount is paid to
the Company at such time as may be required by the Administrator; or 
 (D)    With the
consent of the Administrator, any other form of payment permitted under Section 5(f) of the Plan; or 

(E)    Any combination of the above permitted forms of payment; and 

(iii)    Subject to Section 9(e) of the Plan, full payment for any applicable
withholding taxes in cash, by wire transfer of immediately available funds or by check or in any form of consideration permitted by the Administrator for the payment of the exercise price pursuant to Section 3(c)(ii) above or pursuant to
Section 3(d) below; and 
 (iv)    In the event the Option or portion thereof shall
be exercised pursuant to Section 3(b) by any person or persons other than Participant, appropriate proof of the right of such person or persons to exercise the Option. 

(d)    Tax Withholding. The Company shall have the authority and the right to deduct or withhold,
or require Participant to remit to the Company, an amount sufficient to satisfy federal, state, local and foreign taxes (including Participant’s employment tax obligation) required by Applicable Law to be withheld with respect to any taxable
event concerning Participant arising as a result of the Option or otherwise under this Agreement, including, without limitation, the authority to deduct such amounts from other compensation payable to Participant by the Company. 

(e)    Fractional Shares. The Option may only be exercised for whole shares of Common Stock. Any
fractional Shares shall be rounded down to the nearest whole share. 
 (f)    Special Tax
Consequences. If the Option is intended to be an Incentive Stock Option, Participant acknowledges that, to the extent that the aggregate fair market value (determined as of the time the Option is granted) of all Shares with respect to which
Incentive Stock Options, including, without limitation, the Option, are first exercisable for the first time by Participant in any calendar year exceeds $100,000 (or such other limitation as imposed by Section 422(d) of the Code), the Option
and such other options (or the applicable portion thereof) shall be treated as not qualifying under Section 

  
 A-2 

 
422 of the Code but rather shall be considered Non-Qualified Stock Options. Participant further acknowledges that the rule set forth in the preceding
sentence shall be applied by taking Options and other “incentive stock options” into account in the order in which they were granted. 

4.    Expiration of Option. The Option may not be exercised to any extent by anyone after
the first to occur of the following events: 
 (a)    The Expiration Date set forth in the Grant Notice;

 (b)    The expiration of three months following the date of Participant’s Termination of
Service, unless such Termination of Service occurs by reason of Participant’s death or Disability or Participant’s discharge by the Company for Cause; 

(c)    The expiration of one year following the date of Participant’s Termination of Service by
reason of Participant’s death or Disability; 
 (d)    The date of Participant’s Termination
of Service as a result of Participant’s discharge by the Company for Cause; or 
 (e)    With
respect to any unvested portion of the Option, the date that is thirty days following Participant’s Termination of Service for any reason other than as a result of Participant’s discharge by the Company for Cause, or such shorter period as
may be determined by the Administrator. 
 Participant acknowledges that an Incentive Stock Option exercised more than three
months after Participant’s termination of status as an Employee, other than by reason of death or Disability, will be taxed as a Non-Qualified Stock Option. 

5.    Transferability. The Option shall not be sold, assigned, transferred, pledged or
otherwise encumbered by Participant, either voluntarily or by operation of law, except by will or the laws of descent and distribution, and, during the life of the Participant, the Option shall be exercisable only by the Participant. 

6.    Restrictive Legends and Stop-Transfer
Orders. 
 (a)    Legends. Participant understands and agrees that the Company shall
cause any certificates issued evidencing the Shares to have the legends set forth below or legends substantially equivalent thereto, together with any other legends that may be required by Applicable Laws: 

THE SHARES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED
(“ACT”), NOR HAVE THEY BEEN REGISTERED OR QUALIFIED UNDER THE SECURITIES LAWS OF ANY STATE. NO TRANSFER OF SUCH SECURITIES WILL BE PERMITTED UNLESS A REGISTRATION STATEMENT UNDER THE ACT IS IN EFFECT AS TO SUCH TRANSFER, THE TRANSFER IS
MADE IN ACCORDANCE WITH RULE 144 UNDER THE ACT, OR IN THE OPINION OF COUNSEL (WHICH MAY BE COUNSEL FOR THE COMPANY) REGISTRATION UNDER THE ACT IS UNNECESSARY IN ORDER FOR SUCH TRANSFER TO COMPLY WITH THE ACT AND WITH APPLICABLE STATE SECURITIES
LAWS. 

  
 A-3 

 THE SHARES REPRESENTED BY THIS CERTIFICATE MAY BE
TRANSFERRED ONLY IN ACCORDANCE WITH THE TERMS OF AN AGREEMENT BETWEEN THE COMPANY AND THE STOCKHOLDER, A COPY OF WHICH IS ON FILE WITH THE SECRETARY OF THE COMPANY. SUCH TRANSFER RESTRICTIONS ARE BINDING ON TRANSFEREES OF THESE SHARES. 

(b)    Stop Transfer Orders. Participant agrees that, in order to ensure compliance with the
restrictions referred to in the Plan and this Agreement, the Company may issue appropriate “stop transfer” instructions to its transfer agent, if any, and that, if the Company transfers its own securities, it may make appropriate notations
to the same effect in its own records. 
 (c)    Impermissible Transfers Void. The Company
shall not be required (i) to transfer on its books any Shares that have been sold or otherwise transferred in violation of any of the provisions of this Agreement or (ii) to treat as owner of such Shares or to accord the right to vote or
pay dividends to any purchaser or other transferee to whom such Shares shall have been so transferred. Any transfer or attempted transfer of the Option or any of the Restricted Shares not in accordance with the terms of this Agreement shall be void.

 7.    Taxes. Participant understands that Participant may suffer adverse tax
consequences as a result of Participant’s purchase or disposition of the Shares. Participant represents that Participant has consulted with any tax consultants Participant deems advisable in connection with the purchase or disposition of the
Shares and that Participant is not relying on the Company for any tax advice. Participant is relying solely on such advisors and not on any statements or representations of the Company or any of its agents. Participant understands that Participant
(and not the Company) shall be responsible for Participant’s tax liability that may arise as a result of the transactions contemplated by this Agreement. 

8.    Miscellaneous. 

(a)    No Right To Employment or Other Status. No person shall have any claim or right to be
granted an Award, and the grant of an Award shall not be construed as giving a Participant the right to continued employment or any other relationship with the Company. The Company expressly reserves the right at any time to dismiss or otherwise
terminate its relationship with a Participant free from any liability or claim under the Plan or this Agreement. 

(b)    Notices. Any notice to be given under the terms of this Agreement to the Company shall be
addressed to the Company in care of the Secretary of the Company at the Company’s principal executive offices, and any notice to be given to Participant shall be addressed to Participant at the most-recent physical or email address for
Participant listed in the Company’s personnel records. By a notice given pursuant to this Section 8(b), either party may hereafter designate a different address for notices to be given to that party. Any notice which is required to be
given to Participant shall, if Participant is then deceased, be given to the person entitled to exercise his or her Option by written notice under this Section 8(b). Any notice shall be deemed duly given when sent via email or when sent by
certified mail (return receipt requested) and deposited (with postage prepaid) in a post office or branch post office regularly maintained by the United States Postal Service. 

(c)    Successors and Assigns. The Company may assign any of its rights under this Agreement and
the Exercise Notice 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 

  
 A-4 

 
forth, this Agreement shall be binding upon Participant and his or her heirs, executors, administrators, successors and assigns. 

(d)    Severability. In the event any portion of the Plan or this Agreement or any action taken
pursuant thereto shall be held illegal or invalid for any reason, the illegality or invalidity shall not affect the remaining parts of the Plan and this Agreement, and the Plan and this Agreement shall be construed and enforced as if the illegal or
invalid provisions had not been included, and the illegal or invalid action shall be null and void. 

(e)    Entire Agreement; Governing Documents. The Plan, the Grant Notice and this Agreement
(including all Exhibits thereto) constitute the entire agreement of the parties and supersede in their entirety all prior undertakings and agreements of the Company and Participant with respect to the subject matter hereof. In the event of any
contradiction between the Plan and this Agreement or any other written agreement between a Participant and the Company that has been approved by the Administrator, the terms of the Plan shall govern. Participant hereby agrees to execute such further
instruments and to take such further action as the Company requests to carry out the purposes and intent of this Agreement and the Plan, including, without limitation, restrictions on the transferability of shares of Common Stock, the right of the
Company to repurchase shares of Common Stock, the right of the Company to require that shares of Common Stock be transferred in the event of certain transactions, tag-along rights, bring-along rights,
redemption and co-sale rights and voting requirements in accordance with Section 10(o) of the Plan. 

(f)    Governing Law. The provisions of the Plan and all Awards made thereunder, including the
Option, shall be governed by and interpreted in accordance with the laws of the State of Delaware, disregarding choice-of-law principles of the law of any state that
would require the application of the laws of a jurisdiction other than such state. 
 (g)    Titles
and Headings. The titles and headings of the Sections in this Agreement are for convenience of reference only and, in the event of any conflict, the text of this Agreement, rather than such titles or headings, shall control. 

  
 A-5 

 EXHIBIT B 

TO STOCK OPTION GRANT NOTICE 

FORM OF EXERCISE NOTICE 

Effective as of today,
                ,
                , the undersigned (“Participant”) hereby elects to exercise Participant’s option to
purchase                  Shares of Gossamer Bio, Inc. (the “Company”) under and pursuant to the
Gossamer Bio, Inc. 2017 Equity Incentive Plan (the “Plan”) and the Stock Option Grant Notice and Stock Option Agreement dated
                , ____ (the “Agreement”). Capitalized terms used herein without definition shall have
the meanings given in the Agreement. 
  

			
	 Grant Date:
	 	  

		
	 Number of Shares as to which Option is Exercised:
	 	  

		
	 Exercise Price per Share:
	 	 $

		
	 Total Exercise Price:
	 	 $

		
	 Certificate to be issued in name of:
	 	  

		
	 Cash Payment delivered herewith:
	 	
$                       
          (Representing the full Exercise Price for the Shares, as well as any applicable withholding tax)

		
	 Type of Option:
	 	 ☐ Incentive Stock Option        ☐
Non-Qualified Stock Option

 1.    Representations of Participant. Participant
acknowledges that Participant has received, read and understood the Plan and the Agreement. Participant agrees to abide by and be bound by their terms and conditions. 

2.    Tax Consultation. Participant understands that Participant may suffer adverse tax
consequences as a result of Participant’s purchase or disposition of the Shares. Participant represents that Participant has consulted with any tax consultants Participant deems advisable in connection with the purchase or disposition of the
Shares and that Participant is not relying on the Company for any tax advice. Participant is relying solely on such advisors and not on any statements or representations of the Company or any of its agents. Participant understands that Participant
(and not the Company) shall be responsible for Participant’s tax liability that may arise as a result of this investment or the transactions contemplated by this Agreement. 

3.    Participant Representations. Participant hereby makes the following certifications and
representations with respect to the Shares listed above: 
 (a) Participant is aware of the Company’s business affairs
and financial condition and has acquired sufficient information about the Company to reach an informed and knowledgeable decision to acquire the Shares. Participant is acquiring these Shares for investment for Participant’s own account only and
not with a view to, or for resale in connection with, any “distribution” thereof within the meaning of the Securities Act. 

(b) Participant acknowledges and understands that the Shares constitute “restricted securities” under the Securities
Act and have not been registered under the Securities Act in reliance upon a specific exemption therefrom, which exemption depends upon, among other things, the bona fide nature 

 
of Participant’s investment intent as expressed herein. Participant understands that the Shares must be held indefinitely unless they are subsequently registered under the Securities Act or
an exemption from such registration is available. Participant further acknowledges and understands that the Company is under no obligation to register the Shares. Participant understands that the certificate evidencing the Shares will be imprinted
with a legend which prohibits the transfer of the Shares unless they are registered or such registration is not required in the opinion of counsel satisfactory to the Company and any other legend required under Applicable Laws. 

(c) Participant is familiar with the provisions of Rule 701 and Rule 144, each promulgated under the Securities Act,
which, in substance, permit limited public resale of “restricted securities” acquired, directly or indirectly from the issuer thereof, in a non-public offering subject to the satisfaction of certain
conditions. In the event the Company becomes subject to the reporting requirements of Section 13 or 15(d) of the Exchange Act, ninety days thereafter (or such longer period as any market stand-off
agreement may require) the securities exempt under Rule 701 may be resold, subject to the satisfaction of certain of the conditions specified by Rule 144. 

(d)    In the event that the Company does not qualify under Rule 701 at the time of grant of the
Option, then the securities may be resold in certain limited circumstances subject to the provisions of Rule 144. 

(e) Participant further understands that in the event all of the applicable requirements of Rule 701 or 144 are not
satisfied, registration under the Securities Act, compliance with Regulation A, or some other registration exemption will be required; and that, notwithstanding the fact that Rules 144 and 701 are not exclusive, the Staff of the Securities and
Exchange Commission has expressed its opinion that persons proposing to sell private placement securities other than in a registered offering and otherwise than pursuant to Rules 144 or 701 will have a substantial burden of proof in establishing
that an exemption from registration is available for such offers or sales, and that such persons and their respective brokers who participate in such transactions do so at their own risk. Participant understands that no assurances can be given that
any such other registration exemption will be available in such event. 
 4.    Further
Instruments. Participant hereby agrees to execute such further instruments and to take such further action as the Company requests to carry out the purposes and intent of this Agreement and the Plan, including, without limitation,
restrictions on the transferability of shares of Common Stock, the right of the Company to repurchase shares of Common Stock, the right of the Company to require that shares of Common Stock be transferred in the event of certain transactions, tag-along rights, bring-along rights, redemption and co-sale rights and voting requirements in accordance with Section 10(o) of the Plan. 

5.    Notices. Any notice required or permitted hereunder shall be given in accordance with
the provisions set forth in Section 8(b) of the Agreement. 
 6.    Entire Agreement.
The Plan and Agreement are incorporated herein by reference. This Notice, the Plan and the Agreement constitute the entire agreement of the parties and supersede in their entirety all prior undertakings and agreements of the Company and Participant
with respect to the subject matter hereof. 

  
 B-2 

									
	ACCEPTED BY:
GOSSAMER BIO, INC.	 		 	SUBMITTED BY
PARTICIPANT:
					
	By:	 	 	 		 	By:	 	 
					
	 Print Name:
	 	 	 		 	 Print Name:
	 	 
					
	 Title:
	 	 	 		 		 	

  
 B-3EX-10.3

 Exhibit 10.3 

GOSSAMER BIO, INC. 

2017 EQUITY INCENTIVE PLAN 

RESTRICTED STOCK GRANT NOTICE AND 

RESTRICTED STOCK AGREEMENT 

Gossamer Bio, Inc. (the “Company”), pursuant to its 2017 Equity Incentive Plan (the
“Plan”), hereby grants to Participant the number of shares of the Company’s Common Stock (referred to herein as “Shares”) set forth below. This Restricted Stock award (this
“Award”) is subject to all of the terms and conditions as set forth herein and in the Restricted Stock Agreement attached hereto as Exhibit A (the “Agreement”) and the Plan, each of which is
incorporated herein by reference. Unless otherwise defined herein, the terms defined in the Plan shall have the same defined meanings in this Restricted Stock Grant Notice (“Grant Notice”) and the Agreement. 

 

			
		
	Participant:	  	 [Insert Participant Name]

		
	Grant Date:	  	 [Insert Grant Date]

		
	Vesting Commencement Date:	  	 [Insert Vesting Commencement Date]

		
	Total Number of Shares of Restricted Stock:	  	 [Insert Number of Shares]

		
	Vesting Schedule:	  	 The Shares shall vest and be released from the “Forfeiture Restriction” (as defined in
Section 2(a) of the Agreement) as follows:
  
 25% of
the Shares shall vest and be released from the Forfeiture Restriction on the first anniversary of the Vesting Commencement Date, and 1/48th of the Shares shall vest and be released from the
Forfeiture Restriction on the last day of each one-month period of Participant’s service as a Service Provider thereafter, so that all of the Shares shall be vested and released from the Forfeiture
Restriction on the 4th anniversary of the Vesting Commencement Date.

 By his or her signature and the Company’s signature below, Participant agrees to be bound
by the terms and conditions of the Plan, the Agreement and this Grant Notice. Participant has reviewed the Agreement, the Plan and this Grant Notice in their entirety, has had an opportunity to obtain the advice of counsel prior to executing this
Grant Notice and fully understands all provisions of this Grant Notice, the Agreement and the Plan. Participant hereby agrees to accept as binding, conclusive and final all decisions or interpretations of the Administrator of the Plan upon any
questions arising under the Plan or the Agreement. Participant shall also execute and deliver to the Company the stock assignment duly endorsed in blank, attached to this Grant Notice as Exhibit B (the “Stock
Assignment”). If Participant is married, his or her spouse has signed the Consent of Spouse attached to this Grant Notice as Exhibit C. 
  

									
	GOSSAMER BIO, INC.	 		 	PARTICIPANT
					
	By:	 	 	 		 	By:	 	 
					
	 Print Name:
	 	 	 		 	 Print Name:
	 	 
					
	 Title:
	 	 	 		 	State of Residence:	 	 

 EXHIBIT A 

TO RESTRICTED STOCK GRANT NOTICE 

RESTRICTED STOCK AGREEMENT 

Pursuant to the Grant Notice to which this Agreement is attached, the Company has granted to Participant the number of Shares
indicated in the Grant Notice. 
 1.    Grant of Restricted Stock. 

(a)    Grant of Restricted Stock. In consideration of Participant’s past and/or continued
employment with or service to the Company or a parent or subsidiary of the Company and for other good and valuable consideration, which the Administrator has determined exceeds the par value per Share, effective as of the Grant Date set forth in the
Grant Notice, the Company irrevocably grants to Participant the Shares set forth in the Grant Notice, upon the terms and conditions set forth in the Plan and this Agreement. 

(b)    Issuance of Shares. On the Grant Date, the Company shall issue the Shares to Participant and
shall (i) cause a share certificate or certificates representing the Shares to be registered in the name of Participant, or (ii) cause such Shares to be held in book entry form. If a share certificate is issued, it shall be delivered to
and held in custody by the Company and shall bear the restrictive legends required by Section 4(a) below. If the Shares are held in book entry form, then such entry will reflect that the Shares are subject to the restrictions of this Agreement.

 (c)    Rights as a Stockholder. Except as otherwise provided herein, upon issuance of the
Shares by the Company to Participant (as evidenced by the appropriate entry on the books of the Company or of a duly authorized transfer agent of the Company), Participant shall have all the rights of a stockholder with respect to said Shares,
including the right to receive any cash or stock dividends or other distributions paid to or made with respect to the Shares, subject to the restrictions described in the following sentence, which restrictions shall lapse when the Unreleased Shares
are released from the Forfeiture Restriction as set forth in Section 2. Unless otherwise provided by the Administrator, if any dividends or distributions are paid in cash or shares, or consist of a dividend or distribution to holders of Common
Stock of property, the cash, shares or other property paid or made with respect to Unreleased Shares will be retained in custody by the Company (without interest) (the “Retained Distributions”) and subject to the same
forfeiture and transferability restrictions as the Unreleased Shares with respect to which they were paid or made and shall automatically be forfeited to the Company for no consideration in the event of the forfeiture of the Unreleased Shares with
respect to which they were paid pursuant to the Forfeiture Restriction. Any Retained Distributions held by the Company that were paid on those Unreleased Shares as to which the Forfeiture Restriction and transfer restrictions lapse or are removed
shall also be released to Participant at the time of such lapse or removal. In no event shall a Retained Distribution be paid with respect to Unreleased Shares later than the end of the calendar year in which the corresponding dividends or
distributions are paid to holders of Common Stock or, if later, the 15th day of the third month following the later of (a) the date the dividends or distributions are paid to holders of Common Stock and (b) the date the Unreleased Shares
with respect to which the Retained Distributions are paid vest. Participant shall enjoy rights as a stockholder until such time as Participant disposes of the Shares or the Company and/or its assignee(s) exercises the Right of First Refusal under
the Plan. Upon such exercise, Participant shall have no further rights as a holder of the Shares except the right to receive payment for the Shares so purchased in accordance with the provisions of the Plan and this Agreement, and Participant shall
forthwith cause the certificate(s), if any issued, evidencing the Shares so purchased to be surrendered to the Company for transfer or cancellation. 

 2.    Restrictions on Shares. 

(a)    Forfeiture Restriction. Subject to the provisions of Section 2(b) below, in the event
of Participant’s Termination of Service for any reason, all of the Shares which, from time to time, have not yet been released from the Forfeiture Restriction (together with and any Retained Distributions paid thereon pursuant to
Section 1(c) and held by the Company, the “Unreleased Shares”) shall thereupon be forfeited immediately and without any further action by the Company (the “Forfeiture Restriction”). Upon the
occurrence of such forfeiture, the Company shall become the legal and beneficial owner of the Unreleased Shares, and all rights and interests therein or relating thereto, and the Company shall have the right to retain and transfer to its own name
the number of Unreleased Shares being forfeited by Participant. The Unreleased Shares shall be held by the Company in accordance with Section 3 until the Shares are forfeited as provided in this Section 2(a), until such Unreleased Shares
are fully released from the Forfeiture Restriction, or until such time as this Agreement no longer is in effect. Participant hereby authorizes and directs the Secretary of the Company, or such other person designated by the Administrator, to
transfer the Unreleased Shares which have been forfeited pursuant to this Section 2(a) from Participant to the Company. 

(b)    Release of Shares from Forfeiture Restriction. The Shares shall be released from the
Forfeiture Restriction in accordance with the vesting schedule set forth in the Grant Notice. As soon as administratively practicable following the release of any Shares from the Forfeiture Restriction, the Company shall, as applicable, either
deliver to Participant the certificate or certificates representing such Shares in the Company’s possession belonging to Participant, or, if the Shares are held in book entry form, then the Company shall remove the notations on the book form.
Participant (or the beneficiary or personal representative of Participant in the event of Participant’s death or incapacity, as the case may be) shall deliver to the Company any representations or other documents or assurances as the Company or
its representatives deem necessary or advisable in connection with any such delivery. 

(c)    Transferability. Except as otherwise permitted by the Administrator, the Unreleased Shares
shall not be sold, assigned, transferred, pledged or otherwise encumbered by Participant, either voluntarily or by operation of law, except by will or the laws of descent and distribution. 

3.    Escrow. To insure the availability for delivery of the Unreleased Shares in the event
of the application of the Forfeiture Restriction, Participant appoints the Secretary of the Company, or such other person designated by the Administrator from time to time as escrow agent, as its attorney-in-fact to sell, assign and transfer unto the Company, such Unreleased Shares, if any, forfeited pursuant to the Forfeiture Restriction, together with any Retained Distributions paid thereon pursuant
to Section 1(c) and held by the Company, and shall deliver and deposit with the Secretary of the Company, or such other person designated by the Administrator from time to time, the share certificate(s) representing the Shares, together with
the Stock Assignment. The Unreleased Shares and Stock Assignment (and any Retained Distributions) shall be held by the Secretary, or such other person designated by the Administrator from time to time, in escrow, until the Shares are forfeited as
provided in Section 2(a), until such Shares are fully released from the Forfeiture Restriction or until such time as this Agreement no longer is in effect. Upon release of the Unreleased Shares from the Forfeiture Restriction, the escrow agent
shall as soon as reasonably practicable deliver to Participant the certificate or certificates representing such Shares in the escrow agent’s possession belonging to Participant, and the escrow agent shall be discharged of all further
obligations hereunder. The Company, or its designee, shall not be liable for any act it may do or omit to do with respect to holding the Shares (or any Retained Distributions) in escrow and while acting in good faith and in the exercise of its
judgment. 
 4.    Restrictive Legends and
Stop-Transfer Orders. 

  
 A-2 

 (a)    Legends. Participant understands and
agrees that the Company shall cause any certificates issued evidencing the Shares to have the legends set forth below or legends substantially equivalent thereto, together with any other legends that may be required by Applicable Laws: 

THE SHARES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED
(“ACT”), NOR HAVE THEY BEEN REGISTERED OR QUALIFIED UNDER THE SECURITIES LAWS OF ANY STATE. NO TRANSFER OF SUCH SECURITIES WILL BE PERMITTED UNLESS A REGISTRATION STATEMENT UNDER THE ACT IS IN EFFECT AS TO SUCH TRANSFER, THE TRANSFER IS
MADE IN ACCORDANCE WITH RULE 144 UNDER THE ACT, OR IN THE OPINION OF COUNSEL (WHICH MAY BE COUNSEL FOR THE COMPANY) REGISTRATION UNDER THE ACT IS UNNECESSARY IN ORDER FOR SUCH TRANSFER TO COMPLY WITH THE ACT AND WITH APPLICABLE STATE SECURITIES
LAWS. 
 THE SHARES REPRESENTED BY THIS CERTIFICATE MAY BE SUBJECT TO FORFEITURE PURSUANT TO, AND MAY BE
TRANSFERRED ONLY IN ACCORDANCE WITH, THE TERMS OF AN AGREEMENT BETWEEN THE COMPANY AND THE STOCKHOLDER, A COPY OF WHICH IS ON FILE WITH THE SECRETARY OF THE COMPANY. SUCH FORFEITURE AND/OR TRANSFER RESTRICTIONS ARE BINDING ON TRANSFEREES OF THESE
SHARES. 
 (b)    Stop Transfer Orders. Participant agrees that, in order to ensure compliance
with the restrictions referred to in the Plan and this Agreement, the Company may issue appropriate “stop transfer” instructions to its transfer agent, if any, and that, if the Company transfers its own securities, it may make appropriate
notations to the same effect in its own records. 
 (c)    Impermissible Transfers Void. The
Company shall not be required (i) to transfer on its books any Shares that have been sold or otherwise transferred in violation of any of the provisions of this Agreement or (ii) to treat as owner of such Shares or to accord the right to
vote or pay dividends to any purchaser or other transferee to whom such Shares shall have been so transferred. Any transfer or attempted transfer of the Shares not in accordance with the terms of this Agreement shall be void. 

5.    Taxes. 

(a)    Tax Consequences of Award. Participant understands that Participant may suffer adverse tax
consequences as a result of Participant’s receipt of, vesting in or disposition of the Shares. Participant represents that Participant has consulted with any tax consultants Participant deems advisable in connection with the receipt of the
Shares and that Participant is not relying on the Company for any tax advice. Participant is relying solely on such advisors and not on any statements or representations of the Company or any of its agents. Participant understands that Participant
(and not the Company) shall be responsible for Participant’s tax liability that may arise as a result of the transactions contemplated by this Agreement. 

(b)    Section 83(b) Election for Unreleased Shares. Participant acknowledges
that, unless an election is filed by Participant with the Internal Revenue Service and, if necessary, the proper 

  
 A-3 

 
state taxing authorities, within thirty days of the receipt of the Unreleased Shares, electing pursuant to Section 83(b) of the Code (and similar state tax provisions if applicable) to be
taxed currently on their Fair Market Value on the date of issuance, there will be a recognition of taxable income to the Participant equal to the Fair Market Value of the Unreleased Shares at the time the Forfeiture Restriction lapses. Participant
represents that Participant has consulted any tax consultant(s) Participant deems advisable in connection with the purchase of the Shares or the filing of the election under Section 83(b) of the Code and similar tax provisions. 

PARTICIPANT ACKNOWLEDGES THAT IT IS PARTICIPANT’S SOLE RESPONSIBILITY AND NOT THE COMPANY’S TO TIMELY FILE THE
ELECTION UNDER SECTION 83(B) OF THE CODE, AND THE COMPANY AND ITS REPRESENTATIVES SHALL HAVE NO OBLIGATION OR AUTHORITY TO MAKE THIS FILING ON PARTICIPANT’S BEHALF. 

(b)    Tax Withholding. The Company shall have the authority and the right to deduct or withhold,
or require Participant to remit to the Company, an amount sufficient to satisfy federal, state, local and foreign taxes (including Participant’s employment tax obligation) required by Applicable Law to be withheld with respect to any taxable
event concerning Participant arising as a result of the grant or vesting of the Shares or otherwise under this Agreement, including, without limitation, the authority to deduct such amounts from other compensation payable to Participant by the
Company. 
 6.    Participant Representations. Participant hereby makes the following
certifications and representations with respect to the Shares listed above: 
 (a)    Participant is
aware of the Company’s business affairs and financial condition and has acquired sufficient information about the Company to reach an informed and knowledgeable decision to acquire the Shares. Participant is acquiring these Shares for
investment for Participant’s own account only and not with a view to, or for resale in connection with, any “distribution” thereof within the meaning of the Securities Act. 

(b)    Participant acknowledges and understands that the Shares constitute “restricted
securities” under the Securities Act and have not been registered under the Securities Act in reliance upon a specific exemption therefrom, which exemption depends upon, among other things, the bona fide nature of Participant’s investment
intent as expressed herein. Participant understands that the Shares must be held indefinitely unless they are subsequently registered under the Securities Act or an exemption from such registration is available. Participant further acknowledges and
understands that the Company is under no obligation to register the Shares. Participant understands that the certificate evidencing the Shares will be imprinted with a legend which prohibits the transfer of the Shares unless they are registered or
such registration is not required in the opinion of counsel satisfactory to the Company and any other legend required under Applicable Laws. 

(c)    Participant is familiar with the provisions of Rule 701 and Rule 144, each promulgated
under the Securities Act, which, in substance, permit limited public resale of “restricted securities” acquired, directly or indirectly from the issuer thereof, in a non-public offering subject to
the satisfaction of certain conditions. In the event the Company becomes subject to the reporting requirements of Section 13 or 15(d) of the Exchange Act, ninety days thereafter (or such longer period as any market stand-off agreement may require) the securities exempt under Rule 701 may be resold, subject to the satisfaction of certain of the conditions specified by Rule 144. 

  
 A-4 

 (d)    In the event that the Company does not qualify
under Rule 701 at the time of issuance of the Shares, then the securities may be resold in certain limited circumstances subject to the provisions of Rule 144. 

(e)    Participant further understands that in the event all of the applicable requirements of
Rule 701 or 144 are not satisfied, registration under the Securities Act, compliance with Regulation A, or some other registration exemption will be required; and that, notwithstanding the fact that Rules 144 and 701 are not exclusive, the
Staff of the Securities and Exchange Commission has expressed its opinion that persons proposing to sell private placement securities other than in a registered offering and otherwise than pursuant to Rules 144 or 701 will have a substantial burden
of proof in establishing that an exemption from registration is available for such offers or sales, and that such persons and their respective brokers who participate in such transactions do so at their own risk. Participant understands that no
assurances can be given that any such other registration exemption will be available in such event. 

7.    Miscellaneous. 

(a)    No Right To Employment or Other Status.    No person shall have any
claim or right to be granted an Award, and the grant of an Award shall not be construed as giving Participant the right to continued employment or any other relationship with the Company. The Company expressly reserves the right at any time to
dismiss or otherwise terminate its relationship with Participant free from any liability or claim under the Plan or this Agreement. 

(b)    Notices. Any notice to be given under the terms of this Agreement to the Company shall be
addressed to the Company in care of the Secretary of the Company at the Company’s principal executive offices, and any notice to be given to Participant shall be addressed to Participant at the most-recent physical or email address for
Participant listed in the Company’s personnel records. By a notice given pursuant to this Section 7(b), either party may hereafter designate a different address for notices to be given to that party. Any notice shall be deemed duly given
when sent via email or when sent by certified mail (return receipt requested) and deposited (with postage prepaid) in a post office or branch post office regularly maintained by the United States Postal Service. 

(c)    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. 
 (d)    Severability. In the event
any portion of the Plan or this Agreement or any action taken pursuant hereto shall be held illegal or invalid for any reason, the illegality or invalidity shall not affect the remaining parts of the Plan and this Agreement, and the Plan and this
Agreement shall be construed and enforced as if the illegal or invalid provisions had not been included, and the illegal or invalid action shall be null and void. 

(e)    Entire Agreement; Governing Documents. The Plan, the Grant Notice and this Agreement
(including all Exhibits thereto) constitute the entire agreement of the parties and supersede in their entirety all prior undertakings and agreements of the Company and Participant with respect to the subject matter hereof. In the event of any
contradiction between the Plan and this Agreement or any other written agreement between a Participant and the Company that has been approved by the Administrator, the terms of the Plan shall govern. Participant hereby agrees to execute such further
instruments and to take such further action as the Company requests to carry out the purposes and intent of this Agreement and the Plan, including, without limitation, restrictions on the transferability of shares of Common Stock, the right of the
Company to repurchase shares of Common Stock, the right of the Company to require that 

  
 A-5 

 
shares of Common Stock be transferred in the event of certain transactions, tag-along rights, bring-along rights, redemption and co-sale rights and voting requirements in accordance with Section 10(o) of the Plan. 

(f)    Governing Law. The provisions of the Plan and all Awards made thereunder, including the
Shares, shall be governed by and interpreted in accordance with the laws of the State of Delaware, disregarding choice-of-law principles of the law of any state that
would require the application of the laws of a jurisdiction other than such state. 
 (g)    Titles
and Headings. The titles and headings of the Sections in this Agreement are for convenience of reference only and, in the event of any conflict, the text of this Agreement, rather than such titles or headings, shall control. 

  
 A-6 

 EXHIBIT B 

TO RESTRICTED STOCK GRANT NOTICE 

STOCK ASSIGNMENT 
 [See
instructions below] 
 FOR VALUE RECEIVED I,
                                , hereby sell, assign and transfer unto
                                 the shares of the Common Stock of Gossamer Bio,
Inc. registered in my name on the books of said corporation represented by Certificate No.                  and do hereby irrevocably constitute and appoint
                                 to transfer the said stock on the books of the
within named corporation with full power of substitution in the premises. 
 This Assignment Separate from Certificate may
be used only in accordance with the Restricted Stock Grant Notice and Restricted Stock Agreement between Gossamer Bio, Inc. and the undersigned dated
                                         
                                   .  

Dated:
                                ,
                 
  

			
		
	Signature:	 	 
		 	 [Name]

 INSTRUCTIONS:  Please do not fill in any blanks other than the signature
line. The purpose of this assignment is to enable the Company to enforce the Forfeiture Restriction, as set forth in the Restricted Stock Grant Notice and Restricted Stock Agreement, without requiring additional signatures on the part of
Participant. 

  
 B-1 

 EXHIBIT C 

TO RESTRICTED STOCK GRANT NOTICE 

CONSENT OF SPOUSE 

I,
                                , spouse of
                                , have read and approve the foregoing Restricted
Stock Grant Notice and Restricted Stock Agreement dated
                                ,
                , between my spouse and Gossamer Bio, Inc. In consideration of issuing to my spouse the shares of the Common Stock of Gossamer Bio, Inc. set forth
in the Restricted Stock Grant Notice and Restricted Stock Agreement, I hereby appoint my spouse as my attorney-in-fact in respect to the exercise of any rights under the
Restricted Stock Grant Notice and Restricted Stock Agreement and agree to be bound by the provisions of the Restricted Stock Grant Notice and Restricted Stock Agreement insofar as I may have any rights in said Agreement or any shares issued pursuant
thereto under the community property laws or similar laws relating to marital property in effect in the state of our residence as of the date of the signing of the Restricted Stock Grant Notice and Restricted Stock Agreement. 

Dated:
                                ,
                
                                         
           Signature of Spouse:
                                         
                        

  
 C-1 

 FORM OF 83(B) ELECTION AND INSTRUCTIONS 

These instructions are provided to assist you if you choose to make an election under Section 83(b) of the Internal
Revenue Code, as amended, with respect to the shares of common stock of Gossamer Bio, Inc. transferred to you. Please consult with your personal tax advisor as to whether an election of this nature will be in your best interests in light of your
personal tax situation. 
 The executed original of the Section 83(b) election must be filed with the Internal
Revenue Service not later than 30 days after the date the shares were transferred to you. There is no remedy for failure to file on time. The steps outlined below should be followed to ensure the election is mailed and filed correctly and in
a timely manner. If you make the Section 83(b) election, the election is irrevocable. 
 Complete
the Section 83(b) election form (attached as Attachment 1) and make four (4) copies of the signed election form. Your spouse, if any, should sign the Section 83(b) election form as well. 

Prepare the cover letter to the Internal Revenue Service (sample letter attached as Attachment 2). 

Send the cover letter with the originally executed Section 83(b) election form and one (1) copy via certified mail,
return receipt requested to the Internal Revenue Service at the address of the Internal Revenue Service where you file your personal tax returns. We suggest that you have the package date-stamped at the post office. The post office will provide you
with a certified receipt that includes a dated postmark. Enclose a self-addressed, stamped envelope so that the Internal Revenue Service may return a date-stamped copy to you. However, your postmarked receipt is your proof of having timely filed the
Section 83(b) election if you do not receive confirmation from the Internal Revenue Service. 
 One (1) copy must
be sent to Gossamer Bio, Inc. for its records. 
 Retain the Internal Revenue Service file stamped copy (when returned) for
your records. 
 Please consult your personal tax advisor for the address of the office of the Internal Revenue Service to
which you should mail your election form. 

 ATTACHMENT 1 

ELECTION UNDER INTERNAL REVENUE CODE SECTION 83(B) 

The undersigned taxpayer hereby elects, pursuant to Section 83(b) of the Internal Revenue Code of 1986, as amended, to
include in taxpayer’s gross income for the current taxable year the amount of any compensation taxable to taxpayer in connection with taxpayer’s receipt of shares (the “Shares”) of Common Stock of Gossamer Bio,
Inc., a Delaware corporation (the “Company”). 
 The name, address and taxpayer identification number of the
undersigned taxpayer are: 
  

					
	  
	 		 	
	  
	 		 	
	  
	 		 	

							
				
	 SSN:
	 	  
	 		 	

 The name, address and taxpayer identification number of the Taxpayer’s spouse are
(complete if applicable): 
  

					
	  
	 		 	
	  
	 		 	
	  
	 		 	

							
				
	 SSN:
	 	  
	 		 	

 Description of the property with respect to which the election is being made: 

                    
             (                ) shares of Common Stock of the Company. 

The date on which the property was transferred was
                                . The taxable year to which this election relates
is calendar year                 . 
 Nature of
restrictions to which the property is subject: 
 The Shares are subject to forfeiture upon the occurrence of certain events.
This forfeiture restriction lapses based upon the continued performance of services by the taxpayer over time. 
 The fair market value at
the time of transfer (determined without regard to any lapse restrictions, as defined in Treasury Regulation Section 1.83-3(i)) of the Shares was
$                 per Share. 
 The amount paid by
the taxpayer for the Shares was $0.00 per share. 
 A copy of this statement has been furnished to the Company. 

Dated:
                                ,
                                        
                            Taxpayer Signature

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