Document:

EX-10.5(c)

 Exhibit 10.5(c) 

ALLERGEN RESEARCH CORPORATION 

NOTICE OF GRANT OF STOCK OPTION 

(IMMEDIATELY EXERCISABLE) 
 The Participant
has been granted an option (the “Option”) to purchase certain shares of Stock of Allergen Research Corporation pursuant to the Allergen Research Corporation 2013 Stock Plan (the
“Plan”), as follows: 
  

									
	Participant:		  
		
			
	Date of Grant:		  
		
			
	Number of Option Shares:		  
		,
			subject to adjustment as provided by the Option Agreement.		
			
	Exercise Price:		$		  

			
	Initial Vesting Date:		The date one (1) year after [vesting commencement date]		
			
	Option Expiration Date:		The date [ten (10)] [five (5)] years after the Date of Grant		
			
	Tax Status of Option:		  
		
			Stock Option. (Enter “Incentive” or “Nonstatutory.” If blank, this Option will be a Nonstatutory Stock Option.)		
			
	Vested Shares:		Except as provided in the Stock Option Agreement, the number of Vested Shares (disregarding any resulting fractional share) as of any date is determined by multiplying the Number of Option Shares by the
“Vested Ratio” determined as of such date as follows:		
					
	 		 		 		 Vested Ratio
		 
				
			Prior to Initial Vesting Date		0		
				
			On Initial Vesting Date, provided the Participant’s Service has not terminated prior to such date		1/4		
				
			Plus				
				
			For each additional full month of the Participant’s continuous Service from Initial Vesting Date until the Vested Ratio equals 1/1, an additional		1/48		

 The Exercise Price represents an amount the Company believes to be no less than the fair market value of a share of Stock as
of the Date of Grant, determined in good faith in compliance with the requirements of Section 409A of the Code. However, there is no guarantee that the Internal Revenue Service will agree with the Company’s determination. A subsequent IRS
determination that the Exercise Price is less than such fair market value could result in adverse tax consequences to the Participant. By signing below, the Participant agrees that the Company, its directors, officers and shareholders shall not be
held liable for any tax, penalty, interest or cost incurred by the Participant as a result of such determination by the IRS. The Participant is urged to consult with his or her own tax advisor regarding the tax consequences of the Option, including
the application of Section 409A. 
 By their signatures below, the Company and the Participant agree that the Option is governed by this Grant Notice
and by the provisions of the Plan and the Stock Option Agreement, both of which are attached to and made a part of this document. The Participant acknowledges receipt of copies of the Plan and the Stock Option Agreement, represents that the
Participant has read and is familiar with their provisions, and hereby accepts the Option subject to all of their terms and conditions. 

									
	ALLERGEN RESEARCH CORPORATION				PARTICIPANT
				
	By:		  
				  

							Signature
				
	Its:		  
				  

							Date		
				
	Address:		309 University Drive				  

			Menlo Park, CA 94025						
							Address
				
							  

  

			
	ATTACHMENTS:		2013 Stock Plan, as amended to the Date of Grant; Stock Option Agreement (Immediately Exercisable), Exercise Notice and Assignment Separate from Certificate

 THE SECURITIES WHICH ARE THE SUBJECT OF THIS AGREEMENT HAVE NOT BEEN QUALIFIED WITH THE COMMISSIONER OF
CORPORATIONS OF THE STATE OF CALIFORNIA AND THE ISSUANCE OF SUCH SECURITIES OR THE PAYMENT OR RECEIPT OF ANY PART OF THE CONSIDERATION THEREFOR PRIOR TO SUCH QUALIFICATION IS UNLAWFUL, UNLESS THE SALE OF SECURITIES IS EXEMPT FROM QUALIFICATION BY
SECTION 25100, 25102, OR 25105 OF THE CALIFORNIA CORPORATIONS CODE. THE RIGHTS OF ALL PARTIES TO THIS AGREEMENT ARE EXPRESSLY CONDITIONED UPON SUCH QUALIFICATION BEING OBTAINED, UNLESS THE SALE IS SO EXEMPT. 

THE SECURITIES WHICH ARE THE SUBJECT OF THIS AGREEMENT HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION WITH, THE SALE OR
DISTRIBUTION THEREOF. NO SUCH SALE OR DISPOSITION MAY BE EFFECTED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO OR AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT OF
1933. 
 ALLERGEN RESEARCH CORPORATION 

STOCK OPTION AGREEMENT 

(Immediately Exercisable) 

Allergen Research Corporation has granted to the Participant named in the Notice of Grant of Stock Option (the
“Grant Notice”) to which this Stock Option Agreement (the “Option Agreement”) is attached an option (the “Option”) to purchase certain
shares of Stock upon the terms and conditions set forth in the Grant Notice and this Option Agreement. The Option has been granted pursuant to and shall in all respects be subject to the terms and conditions of the Allergen Research Corporation 2013
Stock Plan (the “Plan”), as amended to the Date of Grant, the provisions of which are incorporated herein by reference. By signing the Grant Notice, the Participant: (a) acknowledges receipt of, and
represents that the Participant has read and is familiar with, the Grant Notice, this Option Agreement and the Plan, (b) accepts the Option subject to all of the terms and conditions of the Grant Notice, this Option Agreement and the Plan, and
(c) agrees to accept as binding, conclusive and final all decisions or interpretations of the Board upon any questions arising under the Grant Notice, this Option Agreement or the Plan. 

 

	 	1.	DEFINITIONS AND CONSTRUCTION. 

1.1 Definitions. Unless otherwise defined herein, capitalized terms shall have the meanings assigned to such terms
in the Grant Notice or the Plan. 
 1.2 Construction. Captions and titles contained herein are for convenience
only and shall not affect the meaning or interpretation of any provision of this Option Agreement. Except when otherwise indicated by the context, the singular shall include the plural and the plural shall include the singular. Use of the term
“or” is not intended to be exclusive, unless the context clearly requires otherwise. 

  
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	 	2.	TAX CONSEQUENCES. 

2.1 Tax Status of Option. This Option is intended to have the tax status designated in the Grant Notice. 

(a) Incentive Stock Option. If the Grant Notice so designates, this Option is intended to be an Incentive
Stock Option within the meaning of Section 422(b) of the Code, but the Company does not represent or warrant that this Option qualifies as such. The Participant should consult with the Participant’s own tax advisor regarding the tax
effects of this Option and the requirements necessary to obtain favorable income tax treatment under Section 422 of the Code, including, but not limited to, holding period requirements. (NOTE TO PARTICIPANT: If the Option is exercised more than
three (3) months after the date on which you cease to be an Employee (other than by reason of your death or permanent and total disability as defined in Section 22(e)(3) of the Code), the Option will be treated as a Nonstatutory Stock
Option and not as an Incentive Stock Option to the extent required by Section 422 of the Code.) 
 (b) Nonstatutory Stock
Option. If the Grant Notice so designates, this Option is intended to be a Nonstatutory Stock Option and shall not be treated as an Incentive Stock Option within the meaning of Section 422(b) of the Code. 

2.2 Election under Section 83(b) of the Code. If the Participant exercises this Option to purchase shares of Stock that are both
nontransferable and subject to a substantial risk of forfeiture, the Participant understands that the Participant should consult with the Participant’s tax advisor regarding the advisability of filing with the Internal Revenue Service an
election under Section 83(b) of the Code, which must be filed no later than thirty (30) days after the date on which the Participant exercises the Option. Shares acquired upon exercise of the Option are nontransferable and subject to a
substantial risk of forfeiture if they are unvested and are subject to a right of the Company to repurchase such shares at the Participant’s original purchase price if the Participant’s Service terminates. Failure to file an election under
Section 83(b), if appropriate, may result in adverse tax consequences to the Participant. However, an election under Section 83(b) may, under certain circumstances, result in adverse tax consequences to the Participant. The Participant
acknowledges that the Participant has been advised to consult with a tax advisor prior to the exercise of the Option regarding the tax consequences to the Participant of the exercise of the Option and the effect of filing or not filing an election
under Section 83(b). AN ELECTION UNDER SECTION 83(b) MUST BE FILED, IF AT ALL, WITHIN 30 DAYS AFTER THE DATE ON WHICH THE PARTICIPANT PURCHASES SHARES. THIS TIME PERIOD CANNOT BE EXTENDED. THE PARTICIPANT ACKNOWLEDGES THAT TIMELY FILING OF A
SECTION 83(b) ELECTION, IF APPROPRIATE, IS THE PARTICIPANT’S SOLE RESPONSIBILITY, EVEN IF THE PARTICIPANT REQUESTS THE COMPANY OR ITS REPRESENTATIVE TO FILE SUCH ELECTION ON HIS OR HER BEHALF. 

2.3 Notice to Company. The Participant will notify the Company in writing if the Participant files an election pursuant to
Section 83(b) of the Code. The Company intends, in the event it does not receive from the Participant evidence of such filing, to claim a tax deduction for any amount which would otherwise be taxable to the Participant in the absence of such an
election. 

  
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 2.4 ISO Fair Market Value Limitation. If the Grant Notice designates this Option as an
Incentive Stock Option, then to the extent that the Option (together with all Incentive Stock Options granted to the Participant under all stock option plans of the Participating Company Group, including the Plan) becomes exercisable for the
first time during any calendar year for shares having a Fair Market Value greater than One Hundred Thousand Dollars ($100,000), the portion of such options which exceeds such amount will be treated as Nonstatutory Stock Options. For purposes of this
Section, options designated as Incentive Stock Options are taken into account in the order in which they were granted, and the Fair Market Value of stock is determined as of the time the option with respect to such stock is granted. If the Code is
amended to provide for a different limitation from that set forth in this Section, such different limitation shall be deemed incorporated herein effective as of the date required or permitted by such amendment to the Code. If the Option is treated
as an Incentive Stock Option in part and as a Nonstatutory Stock Option in part by reason of the limitation set forth in this Section, the Participant may designate which portion of such Option the Participant is exercising. In the absence of such
designation, the Participant shall be deemed to have exercised the Incentive Stock Option portion of the Option first. Separate certificates representing each such portion shall be issued upon the exercise of the Option. (NOTE TO PARTICIPANT: If the
aggregate Exercise Price of the Option (that is, the Exercise Price multiplied by the Number of Option Shares) plus the aggregate exercise price of any other Incentive Stock Options you hold (whether granted pursuant to the Plan or any other stock
option plan of the Participating Company Group) is greater than $100,000, you should contact the Chief Financial Officer of the Company to ascertain whether the entire Option qualifies as an Incentive Stock Option.) 

 

	 	3.	ADMINISTRATION. 

 All
questions of interpretation concerning the Grant Notice, this Option Agreement, the Plan or any other form of agreement or other document employed by the Company in the administration of the Plan or the Option shall be determined by the Board. All
such determinations by the Board shall be final, binding and conclusive upon all persons having an interest in the Option, unless fraudulent or made in bad faith. Any and all actions, decisions and determinations taken or made by the Board in the
exercise of its discretion pursuant to the Plan or the Option or other agreement thereunder (other than determining questions of interpretation pursuant to the preceding sentence) shall be final, binding and conclusive upon all persons having an
interest in the Option. Any Officer shall have the authority to act on behalf of the Company with respect to any matter, right, obligation, or election which is the responsibility of or which is allocated to the Company herein, provided the Officer
has apparent authority with respect to such matter, right, obligation, or election. 
  

	 	4.	EXERCISE OF THE OPTION. 

4.1 Right to Exercise. Except as otherwise provided herein, the Option shall be exercisable on and after the Date of Grant and
prior to the termination of the Option (as provided in Section 6) in an amount not to exceed the total Number of Option Shares less the number of shares previously acquired upon exercise of the Option, subject to the Company’s repurchase
rights set forth in Sections 11 and 12. In no event shall the Option be exercisable for more shares than the Number of Option Shares, as adjusted pursuant to Section 9. 

  
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 4.2 Method of Exercise. Exercise of the Option shall be by means of
electronic or written notice (the “Exercise Notice”) in a form authorized by the Company. An electronic Exercise Notice must be digitally signed or authenticated by the Participant in such manner as required by
the notice and transmitted to the Company or an authorized representative of the Company (including a third-party administrator designated by the Company). In the event that the Participant is not authorized or is unable to provide an electronic
Exercise Notice, the Option shall be exercised by a written Exercise Notice addressed to the Company, which shall be signed by the Participant and delivered in person, by certified or registered mail, return receipt requested, by confirmed facsimile
transmission, or by such other means as the Company may permit, to the Company, or an authorized representative of the Company (including a third-party administrator designated by the Company). Each Exercise Notice, whether electronic or written,
must state the Participant’s election to exercise the Option, the number of whole shares of Stock for which the Option is being exercised and such other representations and agreements as to the Participant’s investment intent with respect
to such shares as may be required pursuant to the provisions of this Option Agreement. Further, each Exercise Notice must be received by the Company prior to the termination of the Option as set forth in Section 6 and must be accompanied by
(a) full payment of the aggregate Exercise Price for the number of shares of Stock being purchased and (b) if the Option is exercised with respect to any Unvested Shares (as defined in Section 11.1), an Assignment Separate from
Certificate duly endorsed (with date and number of shares blank) in the form attached to the Grant Notice. The Option shall be deemed to be exercised upon receipt by the Company of such electronic or written Exercise Notice, the aggregate Exercise
Price and, if required hereby, such duly endorsed Assignment Separate from Certificate. 
 4.3 Payment of Exercise Price. 

(a) Forms of Consideration Authorized. Except as otherwise provided below, payment of the aggregate Exercise Price for
the number of shares of Stock for which the Option is being exercised shall be made (i) in cash, by check or in cash equivalent, (ii) if permitted by the Company and subject to the limitations contained in Section 4.3(b), by means of
(1) a Stock Tender Exercise, (2) a Cashless Exercise or (3) a Net-Exercise; or (iii) by any combination of the foregoing. 

(b) Limitations on Forms of Consideration. The Company reserves, at any and all times, the right, in the Company’s
sole and absolute discretion, to establish, decline to approve or terminate any program or procedure providing for payment of the Exercise Price through any of the means described below, including with respect to the Participant notwithstanding that
such program or procedures may be available to others. 
 (i) Stock Tender Exercise. A “Stock Tender
Exercise” means the delivery of a properly executed Exercise Notice accompanied by (1) the Participant’s tender to the Company, or attestation to the ownership, in a form acceptable to the Company of whole shares of
Stock having a Fair Market Value that does not exceed the aggregate Exercise Price for the shares with respect to which the Option is exercised, and (2) the Participant’s 

  
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payment to the Company in cash of the remaining balance of such aggregate Exercise Price not satisfied by such shares’ Fair Market Value. A Stock Tender Exercise shall not be permitted if it
would constitute a violation of the provisions of any law, regulation or agreement restricting the redemption of the Company’s stock. If required by the Company, the Option may not be exercised by tender to the Company, or attestation to the
ownership, of shares of Stock unless such shares either have been owned by the Participant for a period of time required by the Company (and not used for another option exercise by attestation during such period) or were not acquired, directly or
indirectly, from the Company. 
 (ii) Cashless Exercise. A Cashless Exercise shall be permitted only upon the class of shares
subject to the Option becoming publicly traded in an established securities market. A “Cashless Exercise” means the delivery of a properly executed Exercise Notice together with irrevocable instructions to a
broker in a form acceptable to the Company providing for the assignment to the Company of the proceeds of a sale or loan with respect to shares of Stock acquired upon the exercise of the Option in an amount not less than the aggregate Exercise Price
for such shares (including, without limitation, through an exercise complying with the provisions of Regulation T as promulgated from time to time by the Board of Governors of the Federal Reserve System). 

(iii) Net-Exercise. A “Net-Exercise” means the delivery of a properly executed Exercise Notice
electing a procedure pursuant to which (1) the Company will reduce the number of shares otherwise issuable to the Participant upon the exercise of the Option by the largest whole number of shares having a Fair Market Value that does not exceed
the aggregate Exercise Price for the shares with respect to which the Option is exercised, and (2) the Participant shall pay to the Company in cash the remaining balance of such aggregate Exercise Price not satisfied by such reduction in the
number of whole shares to be issued. Following a Net-Exercise, the number of shares remaining subject to the Option, if any, shall be reduced by the sum of (1) the net number of shares issued to the Participant upon such exercise, and
(2) the number of shares deducted by the Company for payment of the aggregate Exercise Price. 
 4.4 Tax
Withholding. 
 (a) In General. At the time the Option is exercised, in whole or in part, or at any
time thereafter as requested by a Participating Company, the Participant hereby authorizes withholding from payroll and any other amounts payable to the Participant, and otherwise agrees to make adequate provision for any sums required to satisfy
the federal, state, local and foreign tax (including any social insurance) withholding obligations of the Participating Company Group, if any, which arise in connection with the Option. The Company shall have no obligation to deliver shares of Stock
until the tax withholding obligations of the Participating Company Group have been satisfied by the Participant. 
 (b) Withholding
in or Directed Sale of Shares. The Company shall have the right, but not the obligation, to require the Participant to satisfy all or any portion of a Participating Company’s tax withholding obligations upon
exercise of the Option by deducting from the shares of Stock otherwise issuable to the Participant upon such exercise a number of whole shares having a fair market value, as determined by the Company as of the date of exercise, not in excess of the
amount of such tax withholding obligations determined by the 

  
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applicable minimum statutory withholding rates. The Company may require the Participant to direct a broker, upon the exercise of the Option, to sell a portion of the shares subject to the Option
determined by the Company in its discretion to be sufficient to cover the tax withholding obligations of any Participating Company and to remit an amount equal to such tax withholding obligations to the Company in cash. 

4.5 Beneficial Ownership of Shares; Certificate Registration. The Participant hereby authorizes the Company, in
its sole discretion, to deposit the shares acquired pursuant to the exercise of the Option with the Company’s transfer agent, including any successor transfer agent, to be held in book entry form during the term of the Escrow pursuant to
Section 14. Furthermore, the Participant hereby authorizes the Company, in its sole discretion, to deposit, following the term of the Escrow, for the benefit of the Participant with any broker with which the Participant has an account
relationship of which the Company has notice any or all such shares which are no longer subject to the Escrow. Except as provided by the foregoing, a certificate for the shares shall be registered in the name of the Participant, or, if applicable,
in the names of the heirs of the Participant. 
 4.6 Restrictions on Grant of the Option and Issuance of Shares. The
grant of the Option and the issuance of shares of Stock upon exercise of the Option shall be subject to compliance with all applicable requirements of federal, state or foreign law with respect to such securities. The Option may not be exercised if
the issuance of shares of Stock upon exercise would constitute a violation of any applicable federal, state or foreign securities laws or other law or regulations or the requirements of any stock exchange or market system upon which the Stock may
then be listed. In addition, the Option may not be exercised unless (i) a registration statement under the Securities Act shall at the time of exercise of the Option be in effect with respect to the shares issuable upon exercise of the Option
or (ii) in the opinion of legal counsel to the Company, the shares issuable upon exercise of the Option may be issued in accordance with the terms of an applicable exemption from the registration requirements of the Securities Act. THE
PARTICIPANT IS CAUTIONED THAT THE OPTION MAY NOT BE EXERCISED UNLESS THE FOREGOING CONDITIONS ARE SATISFIED. ACCORDINGLY, THE PARTICIPANT MAY NOT BE ABLE TO EXERCISE THE OPTION WHEN DESIRED EVEN THOUGH THE OPTION IS VESTED. The inability of the
Company to obtain from any regulatory body having jurisdiction the authority, if any, deemed by the Company’s legal counsel to be necessary to the lawful issuance and sale of any shares subject to the Option shall relieve the Company of any
liability in respect of the failure to issue or sell such shares as to which such requisite authority shall not have been obtained. As a condition to the exercise of the Option, the Company may require the Participant to satisfy any qualifications
that may be necessary or appropriate, to evidence compliance with any applicable law or regulation and to make any representation or warranty with respect thereto as may be requested by the Company. 

4.7 Fractional Shares. The Company shall not be required to issue fractional shares upon the exercise of the
Option. 
  

	 	5.	NONTRANSFERABILITY OF THE OPTION. 

During the lifetime of the Participant, the Option shall be exercisable only by the Participant or the Participant’s guardian or legal
representative. The Option shall not be subject 

  
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in any manner to anticipation, alienation, sale, exchange, transfer, assignment, pledge, encumbrance, or garnishment by creditors of the Participant or the Participant’s beneficiary, except
transfer by will or by the laws of descent and distribution. Following the death of the Participant, the Option, to the extent provided in Section 7, may be exercised by the Participant’s legal 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. Notwithstanding the foregoing, for so long as the Company is relying on the exemption provided by Rule 12h-1(f) under the Exchange Act,
the Option and, prior to its exercise, the shares to be issued upon the exercise of the Option, shall not be transferred except in compliance with the restrictions on transfer under Rule 12h-1(f) (including the requirement under such rule that any
permitted transferee may not further transfer the Option) or be made subject to any short position, “put equivalent position” or “call equivalent position” by the Participant, as such terms are defined in Rule 16a-1 of the
Exchange Act. 
  

	 	6.	TERMINATION OF THE OPTION. 

The Option shall terminate and may no longer be exercised after the first to occur of (a) the close of business on the Option Expiration
Date, (b) the close of business on the last date for exercising the Option following termination of the Participant’s Service as described in Section 7, or (c) a Change in Control to the extent provided in Section 8. 

 

	 	7.	EFFECT OF TERMINATION OF SERVICE. 

7.1 Option Exercisability. The Option shall terminate immediately upon the Participant’s termination of Service to the extent that
it is then unvested and shall be exercisable after the Participant’s termination of Service to the extent it is then vested only during the applicable time period as determined below and thereafter shall terminate. 

(a) Disability. If the Participant’s Service terminates because of the Disability of the Participant,
the Option, to the extent unexercised and exercisable for Vested Shares on the date on which the Participant’s Service terminated, may be exercised by the Participant (or the Participant’s guardian or legal representative) at any time
prior to the expiration of twelve (12) months after the date on which the Participant’s Service terminated, but in any event no later than the Option Expiration Date. 

(b) Death. If the Participant’s Service terminates because of the death of the Participant, the
Option, to the extent unexercised and exercisable for Vested Shares on the date on which the Participant’s Service terminated, may be exercised by the Participant’s legal representative or other person who acquired the right to exercise
the Option by reason of the Participant’s death at any time prior to the expiration of twelve (12) months after the date on which the Participant’s Service terminated, but in any event no later than the Option Expiration Date. The
Participant’s Service shall be deemed to have terminated on account of death if the Participant dies within three (3) months after the Participant’s termination of Service. 

(c) Termination for Cause. Notwithstanding any other provision of this Option Agreement, if the Participant’s Service is
terminated for Cause, the Option shall terminate in its entirety and cease to be exercisable immediately upon such termination of Service. 

(d) Other Termination of Service. If the Participant’s Service terminates for any reason, except
Disability, death or Cause, the Option, to the extent unexercised and exercisable for Vested Shares by the Participant on the date on which the Participant’s Service terminated, may be exercised by the Participant at any time prior to the
expiration of three (3) months after the date on which the Participant’s Service terminated, but in any event no later than the Option Expiration Date. 

  
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 7.2 Extension if Exercise Prevented by Law. Notwithstanding the
foregoing other than termination of the Participant’s Service for Cause, if the exercise of the Option within the applicable time periods set forth in Section 7.1 is prevented by the provisions of Section 4.6, the Option shall remain
exercisable until the later of (a) thirty (30) days after the date such exercise first would no longer be prevented by such provisions or (b) the end of the applicable time period under Section 7.1, but in any event no later than
the Option Expiration Date. 
  

	 	8.	EFFECT OF CHANGE IN CONTROL. 

In the event of a Change in Control, except to the extent that the Board determines to settle the Option in accordance with Section 9.1(c)
of the Plan, the surviving, continuing, successor, or purchasing corporation or other business entity or parent thereof, as the case may be (the “Acquiror”), may, without the consent of the Participant, assume
or continue in full force and effect the Company’s rights and obligations under all or any portion of the Option or substitute for all or any portion of the Option a substantially equivalent option for the Acquiror’s stock. For purposes of
this Section, the Option or any portion thereof shall be deemed assumed if, following the Change in Control, the Option confers the right to receive, subject to the terms and conditions of the Plan and this Option Agreement, for each share of Stock
subject to such portion of the Option immediately prior to the Change in Control, the consideration (whether stock, cash, other securities or property or a combination thereof) to which a holder of a share of Stock on the effective date of the
Change in Control was entitled (and if holders were offered a choice of consideration, the type of consideration chosen by the holders of a majority of the outstanding shares of Stock); provided, however, that if such consideration is not solely
common stock of the Acquiror, the Board may, with the consent of the Acquiror, provide for the consideration to be received upon the exercise of the Option for each share of Stock to consist solely of common stock of the Acquiror equal in Fair
Market Value to the per share consideration received by holders of Stock pursuant to the Change in Control. If any portion of such consideration may be received by holders of Stock pursuant to the Change in Control on a contingent or delayed basis,
the Board may, in its discretion, determine such Fair Market Value per share as of the time of the Change in Control on the basis of the Board’s good faith estimate of the present value of the probable future payment of such consideration. The
Option shall terminate and cease to be outstanding effective as of the time of consummation of the Change in Control to the extent that the Option is neither assumed or continued by the Acquiror in connection with the Change in Control nor exercised
as of the time of the Change in Control. Notwithstanding the foregoing, shares acquired upon exercise of the Option prior to the Change in Control and any consideration received pursuant to the Change in Control with respect to such shares shall
continue to be subject to all applicable provisions of this Option Agreement except as otherwise provided herein. 

  
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	 	9.	ADJUSTMENTS FOR CHANGES IN CAPITAL STRUCTURE. 

Subject to any required action by the stockholders of the Company and the requirements of Sections 409A and 424 of the Code to the extent
applicable, in the event of any change in the Stock effected without receipt of consideration by the Company, whether through merger, consolidation, reorganization, reincorporation, recapitalization, reclassification, stock dividend, stock split,
reverse stock split, split-up, split-off, spin-off, combination of shares, exchange of shares, or similar change in the capital structure of the Company, or in the event of payment of a dividend or distribution to the stockholders of the Company in
a form other than Stock (excepting normal cash dividends) that has a material effect on the Fair Market Value of shares of Stock, appropriate and proportionate adjustments shall be made in the number, Exercise Price and kind of shares subject to the
Option, in order to prevent dilution or enlargement of the Participant’s rights under the Option. For purposes of the foregoing, conversion of any convertible securities of the Company shall not be treated as “effected without receipt of
consideration by the Company.” Any fractional share resulting from an adjustment pursuant to this Section shall be rounded down to the nearest whole number, and the Exercise Price shall be rounded up to the nearest whole cent. In no event may
the Exercise Price be decreased to an amount less than the par value, if any, of the stock subject to the Option. Such adjustments shall be determined by the Board, and its determination shall be final, binding and conclusive. 

 

	 	10.	RIGHTS AS A STOCKHOLDER, DIRECTOR, EMPLOYEE OR
CONSULTANT. 

 The Participant shall have no rights as a
stockholder with respect to any shares covered by the Option until the date of the issuance of the shares for which the Option has been exercised (as evidenced by the appropriate entry on the books of the Company or of a duly authorized transfer
agent of the Company). No adjustment shall be made for dividends, distributions or other rights for which the record date is prior to the date the shares are issued, except as provided in Section 9. If the Participant is an Employee, the
Participant understands and acknowledges that, except as otherwise provided in a separate, written employment agreement between a Participating Company and the Participant, the Participant’s employment is “at will” and is for no
specified term. Nothing in this Option Agreement shall confer upon the Participant any right to continue in the Service of a Participating Company or interfere in any way with any right of the Participating Company Group to terminate the
Participant’s Service as a Director, an Employee or Consultant, as the case may be, at any time. 
  

	 	11.	UNVESTED SHARE REPURCHASE OPTION. 

11.1 Grant of Unvested Share Repurchase Option. In the event the Participant’s Service is terminated for any
reason or no reason, with or without cause, or, if the Participant, the Participant’s legal representative, or other holder of shares acquired pursuant to this Agreement, attempts to sell, exchange, transfer, pledge, or otherwise dispose of
(other than pursuant to an Ownership Change Event) any Unvested Shares, as defined in Section 11.2 below (the “Unvested Shares”), the Company shall have the right to repurchase the Unvested Shares under the
terms and subject to the conditions set forth in this Section 11 (the “Unvested Share Repurchase Option”). 

  
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 11.2 Unvested Shares Defined. The “Unvested
Shares” shall mean, on any given date, the number of shares of Stock acquired upon exercise of the Option which exceed the Vested Shares determined as of such date. 

11.3 Exercise of Unvested Share Repurchase Option. The Company may exercise the Unvested Share Repurchase Option
by written notice to the Participant within sixty (60) days after (a) termination of the Participant’s Service or (b) the Company has received notice of the attempted disposition of Unvested Shares. If the Company fails to give
notice within such sixty (60) day period, the Unvested Share Repurchase Option shall terminate unless the Company and the Participant have extended the time for the exercise of the Unvested Share Repurchase Option. Notwithstanding the preceding
sentence, the period during which the Company may exercise the Unvested Share Repurchase Option shall terminate no sooner than the completion of a period of eight (8) months following the date on which the Participant acquired the Unvested
Shares upon exercise of the Option. The Unvested Share Repurchase Option must be exercised, if at all, for all of the Unvested Shares, except as the Company and the Participant otherwise agree. 

11.4 Payment for Shares and Return of Shares to Company. The purchase price per share being repurchased by the
Company (the “Repurchase Price”) shall be an amount equal to the Participant’s original cost per share, as adjusted pursuant to Section 9. The Company shall pay the aggregate Repurchase Price to the
Participant in cash within thirty (30) days after the date of the written notice to the Participant of the Company’s exercise of the Unvested Share Repurchase Option. For purposes of the foregoing, cancellation of any purchase money
indebtedness of the Participant to any Participating Company for the shares shall be treated as payment to the Participant in cash to the extent of the unpaid principal and any accrued interest canceled. The shares being repurchased shall be
delivered to the Company by the Participant at the same time as the delivery of the Repurchase Price to the Participant. 
 11.5
Assignment of Unvested Share Repurchase Option. The Company shall have the right to assign the Unvested Share Repurchase Option at any time, whether or not such option is then exercisable, to one or more persons as may be
selected by the Company. 
 11.6 Ownership Change Event. Upon the occurrence of an Ownership Change Event, any
and all new, substituted or additional securities or other property to which the Participant is entitled by reason of the Participant’s ownership of Unvested Shares shall be immediately subject to the Unvested Share Repurchase Option and
included in the terms “Stock” and “Unvested Shares” for all purposes of the Unvested Share Repurchase Option with the same force and effect as the Unvested Shares immediately prior to the Ownership Change Event. While the
aggregate Repurchase Price shall remain the same after such Ownership Change Event, the Repurchase Price per Unvested Share upon exercise of the Unvested Share Repurchase Option following such Ownership Change Event shall be adjusted as appropriate.

  
 10 

	 	12.	RIGHT OF FIRST REFUSAL. 

12.1 Grant of Right of First Refusal. Except as provided in Section 12.7 and Section 18 below, in the event the
Participant, the Participant’s legal representative, or other holder of shares acquired upon exercise of the Option proposes to sell, exchange, transfer, pledge, or otherwise dispose of any Vested Shares (the “Transfer
Shares”) to any person or entity, including, without limitation, any stockholder of a Participating Company, the Company shall have the right to repurchase the Transfer Shares under the terms and subject to the conditions set
forth in this Section 12 (the “Right of First Refusal”). 
 12.2 Notice of Proposed
Transfer. Prior to any proposed transfer of the Transfer Shares, the Participant shall deliver written notice (the “Transfer Notice”) to the Company describing fully the proposed transfer,
including the number of Transfer Shares, the name and address of the proposed transferee (the “Proposed Transferee”) and, if the transfer is voluntary, the proposed transfer price, and containing such
information necessary to show the bona fide nature of the proposed transfer. In the event of a bona fide gift or involuntary transfer, the proposed transfer price shall be deemed to be the Fair Market Value of the Transfer Shares, as determined by
the Board in good faith. If the Participant proposes to transfer any Transfer Shares to more than one Proposed Transferee, the Participant shall provide a separate Transfer Notice for the proposed transfer to each Proposed Transferee. The Transfer
Notice shall be signed by both the Participant and the Proposed Transferee and must constitute a binding commitment of the Participant and the Proposed Transferee for the transfer of the Transfer Shares to the Proposed Transferee subject only to the
Right of First Refusal. 
 12.3 Bona Fide Transfer. If the Company determines that the information provided by
the Participant in the Transfer Notice is insufficient to establish the bona fide nature of a proposed voluntary transfer, the Company shall give the Participant written notice of the Participant’s failure to comply with the procedure described
in this Section 12, and the Participant shall have no right to transfer the Transfer Shares without first complying with the procedure described in this Section 12. The Participant shall not be permitted to transfer the Transfer Shares if
the proposed transfer is not bona fide. 
 12.4 Exercise of Right of First Refusal. If the Company determines the
proposed transfer to be bona fide, the Company shall have the right to purchase all, but not less than all, of the Transfer Shares (except as the Company and the Participant otherwise agree) at the purchase price and on the terms set forth in the
Transfer Notice by delivery to the Participant of a notice of exercise of the Right of First Refusal within thirty (30) days after the date the Transfer Notice is delivered to the Company. The Company’s exercise or failure to exercise the
Right of First Refusal with respect to any proposed transfer described in a Transfer Notice shall not affect the Company’s right to exercise the Right of First Refusal with respect to any proposed transfer described in any other Transfer
Notice, whether or not such other Transfer Notice is issued by the Participant or issued by a person other than the Participant with respect to a proposed transfer to the same Proposed Transferee. If the Company exercises the Right of First Refusal,
the Company and the Participant shall thereupon consummate the sale of the Transfer Shares to the Company on the terms set forth in the Transfer Notice within sixty (60) days after the date the Transfer Notice is delivered to the Company
(unless a longer period is offered by the Proposed Transferee); provided, however, that in the event the Transfer Notice provides for the 

  
 11 

 
payment for the Transfer Shares other than in cash, the Company shall have the option of paying for the Transfer Shares by the present value cash equivalent of the consideration described in the
Transfer Notice as reasonably determined by the Company. For purposes of the foregoing, cancellation of any indebtedness of the Participant to any Participating Company shall be treated as payment to the Participant in cash to the extent of the
unpaid principal and any accrued interest canceled. Notwithstanding anything contained in this Section to the contrary, the period during which the Company may exercise the Right of First Refusal and consummate the purchase of the Transfer Shares
from the Participant shall terminate no sooner than the completion of a period of eight (8) months following the date on which the Participant acquired the Transfer Shares upon exercise of the Option. 

12.5 Failure to Exercise Right of First Refusal. If the Company fails to exercise the Right of First Refusal in
full (or to such lesser extent as the Company and the Participant otherwise agree) within the period specified in Section 12.4 above, the Participant may conclude a transfer to the Proposed Transferee of the Transfer Shares on the terms and
conditions described in the Transfer Notice, provided such transfer occurs not later than ninety (90) days following delivery to the Company of the Transfer Notice or, if applicable, following the end of the period described in the last
sentence of Section 12.4. The Company shall have the right to demand further assurances from the Participant and the Proposed Transferee (in a form satisfactory to the Company) that the transfer of the Transfer Shares was actually carried out
on the terms and conditions described in the Transfer Notice. No Transfer Shares shall be transferred on the books of the Company until the Company has received such assurances, if so demanded, and has approved the proposed transfer as bona fide.
Any proposed transfer on terms and conditions different from those described in the Transfer Notice, as well as any subsequent proposed transfer by the Participant, shall again be subject to the Right of First Refusal and shall require compliance by
the Participant with the procedure described in this Section 12. 
 12.6 Transferees of Transfer Shares.
All transferees of the Transfer Shares or any interest therein, other than the Company, shall be required as a condition of such transfer to agree in writing (in a form satisfactory to the Company) that such transferee shall receive and hold such
Transfer Shares or interest therein subject to all of the terms and conditions of this Option Agreement, including this Section 12 providing for the Right of First Refusal with respect to any subsequent transfer. Any sale or transfer of any
shares acquired upon exercise of the Option shall be void unless the provisions of this Section 12 are met. 
 12.7 Transfers Not
Subject to Right of First Refusal. The Right of First Refusal shall not apply to any transfer or exchange of the shares acquired upon exercise of the Option if such transfer or exchange is in connection with an Ownership
Change Event. If the consideration received pursuant to such transfer or exchange consists of stock of a Participating Company, such consideration shall remain subject to the Right of First Refusal unless the provisions of Section 12.9 below
result in a termination of the Right of First Refusal. 
 12.8 Assignment of Right of First Refusal. The Company
shall have the right to assign the Right of First Refusal at any time, whether or not there has been an attempted transfer, to one or more persons as may be selected by the Company. 

  
 12 

 12.9 Early Termination of Right of First Refusal. The other
provisions of this Option Agreement notwithstanding, the Right of First Refusal shall terminate and be of no further force and effect upon (a) the occurrence of a Change in Control, unless the Acquiror assumes the Company’s rights and
obligations under the Option or substitutes a substantially equivalent option for the Acquiror’s stock for the Option, or (b) the existence of a public market for the class of shares subject to the Right of First Refusal. A
“public market” shall be deemed to exist if (i) such stock is listed on a national securities exchange (as that term is used in the Exchange Act) or (ii) such stock is traded on the over-the-counter market and prices therefor are published daily on business days in a recognized financial journal. 

 

	 	13.	STOCK DISTRIBUTIONS SUBJECT TO OPTION AGREEMENT. 

If, from time to time, there is any stock dividend, stock split or other change, as described in Section 9, in the character or amount of
any of the outstanding stock of the corporation the stock of which is subject to the provisions of this Option Agreement, then in such event any and all new, substituted or additional securities to which the Participant is entitled by reason of the
Participant’s ownership of the shares acquired upon exercise of the Option shall be immediately subject to the Unvested Share Repurchase Option and the Right of First Refusal with the same force and effect as the shares subject to the Unvested
Share Repurchase Option and the Right of First Refusal immediately before such event. 
  

	 	14.	ESCROW. 

 14.1 Appointment of Agent. To
ensure that shares subject to the Unvested Share Repurchase Option will be available for repurchase, the Participant and the Company hereby appoint the Secretary of the Company, or any other person designated by the Company, as their agent and as
attorney-in-fact for the Participant (the “Agent”) to hold any and all Unvested Shares and to sell, assign and transfer to the Company any such Unvested Shares repurchased by the Company pursuant to the Unvested
Share Repurchase Option. The Participant understands that appointment of the Agent is a material inducement to make this Agreement and that such appointment is coupled with an interest and is irrevocable. The Agent shall not be personally liable for
any act the Agent may do or omit to do hereunder as escrow agent, agent for the Company, or attorney in fact for the Participant while acting in good faith and in the exercise of the Agent’s own good judgment, and any act done or omitted by the
Agent pursuant to the advice of the Agent’s own attorneys shall be conclusive evidence of such good faith. The Agent may rely upon any letter, notice or other document executed by any signature purporting to be genuine and may resign at any
time. 
 14.2 Establishment of Escrow. The Participant authorizes the Company to deposit the Unvested Shares
with the Company’s transfer agent to be held in book entry form, as provided by Section 4.5, and the Participant agrees to deliver to and deposit with the Agent each certificate, if any, evidencing the Unvested Shares and an Assignment
Separate from Certificate with respect to such book entry shares and each such certificate duly endorsed (with date and number of shares blank) in the form attached to this Agreement, to be held by the Agent under the terms and conditions of this
Section (the “Escrow”). Upon the occurrence of an Ownership Change Event, a dividend or distribution to the stockholders of the Company paid in shares of Stock or other property (other than regular, periodic
dividends paid on Stock pursuant to the 

  
 13 

 
Company’s dividend policy), or any other adjustment upon a change in the capital structure of the Company, as described in Section 9, any and all new, substituted or additional
securities or other property to which the Participant is entitled by reason of his or her ownership of the shares that remain, following such Ownership Change Event, dividend, distribution or change described in Section 9, subject to the
Unvested Share Repurchase Option shall be immediately subject to the Escrow to the same extent as the shares immediately before such event. The Company shall bear the expenses of the Escrow. 

14.3 Delivery of Shares to Participant. The Escrow shall continue with respect to any shares for so long as such
shares remain subject to the Unvested Share Repurchase Option. Upon termination of the Unvested Share Repurchase Option with respect to shares, the Company shall so notify the Agent and direct the Agent to deliver such number of shares to the
Participant. As soon as practicable after receipt of such notice, the Agent shall cause to be delivered to the Participant the shares specified by such notice, and the Escrow shall terminate with respect to such shares. 

14.4 Notices and Payments. In the event the shares and any other property held in escrow are subject to the
Company’s exercise of the Unvested Share Repurchase Option or the Right of First Refusal, the notices required to be given to the Participant shall be given to the Agent, and any payment required to be given to the Participant shall be given to
the Agent. Within thirty (30) days after payment by the Company, the Agent shall deliver the shares and any other property which the Company has purchased to the Company and shall deliver the payment received from the Company to the
Participant. 
  

	 	15.	NOTICE OF SALES UPON DISQUALIFYING DISPOSITION. 

The Participant shall dispose of the shares acquired pursuant to the Option only in accordance with the provisions of this Option
Agreement. In addition, if the Grant Notice designates this Option as an Incentive Stock Option, the Participant shall (a) promptly notify the Chief Financial Officer of the Company if the Participant disposes of any of the shares
acquired pursuant to the Option within one (1) year after the date the Participant exercises all or part of the Option or within two (2) years after the Date of Grant and (b) provide the Company with a description of the circumstances
of such disposition. Until such time as the Participant disposes of such shares in a manner consistent with the provisions of this Option Agreement, unless otherwise expressly authorized by the Company, the Participant shall hold all shares acquired
pursuant to the Option in the Participant’s name (and not in the name of any nominee) for the one-year period immediately after the exercise of the Option and the two-year period immediately after Date of Grant. At any time during the one-year
or two-year periods set forth above, the Company may place a legend on any certificate representing shares acquired pursuant to the Option requesting the transfer agent for the Company’s stock to notify the Company of any such transfers. The
obligation of the Participant to notify the Company of any such transfer shall continue notwithstanding that a legend has been placed on the certificate pursuant to the preceding sentence. 

  
 14 

	 	16.	LEGENDS. 

 The Company may at any time place legends
referencing the Unvested Share Repurchase Option, the Right of First Refusal and any applicable federal, state or foreign securities law restrictions on all certificates representing shares of stock subject to the provisions of this Option
Agreement. The Participant shall, at the request of the Company, promptly present to the Company any and all certificates representing shares acquired pursuant to the Option in the possession of the Participant in order to carry out the provisions
of this Section. Unless otherwise specified by the Company, legends placed on such certificates may include, but shall not be limited to, the following: 

16.1 “THE SECURITIES EVIDENCED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE
SOLD, TRANSFERRED, ASSIGNED OR HYPOTHECATED UNLESS THERE IS AN EFFECTIVE REGISTRATION STATEMENT UNDER SUCH ACT COVERING SUCH SECURITIES, THE SALE IS MADE IN ACCORDANCE WITH RULE 144 OR RULE 701 UNDER THE ACT, OR THE COMPANY RECEIVES AN OPINION
OF COUNSEL REASONABLY SATISFACTORY TO THE COMPANY, STATING THAT SUCH SALE, TRANSFER, ASSIGNMENT OR HYPOTHECATION IS EXEMPT FROM THE REGISTRATION AND PROSPECTUS DELIVERY REQUIREMENTS OF SUCH ACT.” 

16.2 “THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO CERTAIN RESTRICTIONS ON TRANSFER AND REPURCHASE OPTIONS IN FAVOR OF THE
CORPORATION OR ITS ASSIGNEE SET FORTH IN AN AGREEMENT BETWEEN THE CORPORATION AND THE REGISTERED HOLDER, OR SUCH HOLDER’’S PREDECESSOR IN INTEREST, A COPY OF WHICH IS ON FILE AT THE PRINCIPAL OFFICE OF THIS CORPORATION.” 

16.3 “THE SHARES EVIDENCED BY THIS CERTIFICATE WERE ISSUED BY THE CORPORATION TO THE REGISTERED HOLDER UPON EXERCISE OF AN INCENTIVE
STOCK OPTION AS DEFINED IN SECTION 422 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED (“ISO”). IN ORDER TO OBTAIN THE PREFERENTIAL TAX TREATMENT AFFORDED TO ISOs, THE SHARES SHOULD NOT BE TRANSFERRED PRIOR [INSERT DISQUALIFYING
DISPOSITION DATE HERE]. SHOULD THE REGISTERED HOLDER ELECT TO TRANSFER ANY OF THE SHARES PRIOR TO THIS DATE AND FOREGO ISO TAX TREATMENT, THE TRANSFER AGENT FOR THE SHARES SHALL NOTIFY THE CORPORATION IMMEDIATELY. THE REGISTERED HOLDER SHALL HOLD
ALL SHARES PURCHASED UNDER THE INCENTIVE STOCK OPTION IN THE REGISTERED HOLDER’S NAME (AND NOT IN THE NAME OF ANY NOMINEE) PRIOR TO THIS DATE OR UNTIL TRANSFERRED AS DESCRIBED ABOVE.” 

 

	 	17.	LOCK-UP AGREEMENT. 

The Participant hereby agrees that in the event of any underwritten public offering of stock, including an initial public offering of stock,
made by the Company pursuant to an effective registration statement filed under the Securities Act, the Participant shall not offer, sell, 

  
 15 

 
contract to sell, pledge, hypothecate, grant any option to purchase or make any short sale of, or otherwise dispose of any shares of stock of the Company or any rights to acquire stock of the
Company for such period of time from and after the effective date of such registration statement as may be established by the underwriter for such public offering; provided, however, that such period of time shall not exceed one hundred eighty
(180) days from the effective date of the registration statement to be filed in connection with such public offering; provided, further, however, that such one hundred eighty (180) day period may be extended for an
additional period, not to exceed twenty (20) days, upon the request of the Company or the underwriter to accommodate regulatory restrictions on (i) the publication or other distribution of research reports and (ii) analyst
recommendations and opinions, including but not limited to, the restrictions contained in NASD Rule 2711(f)(4) or NYSE Rule 472(f)(4), or any successor provisions or amendments thereto). The foregoing limitation shall not apply to shares registered
in the public offering under the Securities Act. The Participant hereby agrees to enter into any agreement reasonably required by the underwriters to implement the foregoing within a reasonable timeframe if so requested by the Company. 

 

	 	18.	RESTRICTIONS ON TRANSFER OF SHARES. 

At any time prior to the existence of a public market for the Stock, the Board may prohibit the Participant and any transferee of
such Participant from selling, transferring, assigning, pledging, or otherwise disposing of or encumbering any shares acquired pursuant to the Option (each, a “Transfer”) without the
prior written consent of the Board. The Board may withhold consent for any reason, including without limitation any Transfer (i) to any individual or entity identified by the Company as a potential competitor or considered by the Company to be
unfriendly, or (ii) if such Transfer increases the risk of the Company having a class of security held of record by such number of persons as would require the Company to register any class of securities under the Exchange Act; or (iii) if
such Transfer would result in the loss of any federal or state securities law exemption relied upon by the Company in connection with the initial issuance of such shares or the issuance of any other securities; or (iv) if such Transfer is
facilitated in any manner by any public posting, message board, trading portal, Internet site, or similar method of communication, including without limitation any trading portal or Internet site intended to facilitate secondary transfers of
securities; or (v) if such Transfer is to be effected in a brokered transaction; or (vi) if such Transfer would be of less than all of the shares of Stock then held by the stockholder and its affiliates or is to be made to more than a
single transferee. No shares acquired upon exercise of the Option may be sold, exchanged, transferred (including, without limitation, any transfer to a nominee or agent of the Participant), assigned, pledged, hypothecated or otherwise disposed of,
including by operation of law in any manner which violates any of the provisions of this Option Agreement, and, except pursuant to an Ownership Change Event, until the date on which such shares become Vested Shares, and any such attempted
disposition shall be void. The Company shall not be required (a) to transfer on its books any shares which will have been transferred in violation of any of the provisions set forth in this Option Agreement or (b) to treat as owner of such
shares or to accord the right to vote as such owner or to pay dividends to any transferee to whom such shares will have been so transferred. 

  
 16 

	 	19.	MISCELLANEOUS PROVISIONS. 

19.1 Termination or Amendment. The Board may terminate or amend the Plan or the Option at any time; provided, however, that except as
provided in Section 8 in connection with a Change in Control, no such termination or amendment may adversely affect the Option or any unexercised portion hereof without the consent of the Participant unless such termination or amendment is
necessary to comply with any applicable law or government regulation, including, but not limited to Section 409A of the Code. No amendment or addition to this Option Agreement shall be effective unless in writing. 

19.2 Compliance with Section 409A. The Company intends that income realized by the Participant pursuant to the Plan and this
Option Agreement will not be subject to taxation under Section 409A of the Code. The provisions of the Plan and this Option Agreement shall be interpreted and construed in favor of satisfying any applicable requirements of Section 409A of
the Code. The Company, in its reasonable discretion, may amend (including retroactively) the Plan and this Agreement in order to conform to the applicable requirements of Section 409A of the Code, including amendments to facilitate the
Participant’s ability to avoid taxation under Section 409A of the Code. However, the preceding provisions shall not be construed as a guarantee by the Company of any particular tax result for income realized by the Participant pursuant
to the Plan or this Option Agreement. In any event, and except for the responsibilities of the Company set forth in Section 4.4, no Participating Company shall be responsible for the payment of any applicable taxes incurred by the
Participant on income realized by the Participant pursuant to the Plan or this Option Agreement. 
 19.3 Further Instruments. The
parties hereto agree to execute such further instruments and to take such further action as may reasonably be necessary to carry out the intent of this Option Agreement. 

19.4 Binding Effect. This Option Agreement shall inure to the benefit of the successors and assigns of the Company and, subject to the
restrictions on transfer set forth herein, be binding upon the Participant and the Participant’s heirs, executors, administrators, successors and assigns. 

19.5 Delivery of Documents and Notices. Any document relating to participation in the Plan, or any notice required or permitted
hereunder shall be given in writing and shall be deemed effectively given (except to the extent that this Option Agreement provides for effectiveness only upon actual receipt of such notice) upon personal delivery, electronic delivery at the e-mail
address, if any, provided for the Participant by a Participating Company, or, upon deposit in the U.S. Post Office or foreign postal service, by registered or certified mail, or with a nationally recognized overnight courier service, with postage
and fees prepaid, addressed to the other party at the address of such party set forth in the Grant Notice or at such other address as such party may designate in writing from time to time to the other party. 

(a) Description of Electronic Delivery. The Plan documents, which may include but do not necessarily include: the Plan,
the Grant Notice, this Option Agreement, and any reports of the Company provided generally to the Company’s stockholders, may be delivered to the Participant electronically. In addition, if permitted by the Company, the

  
 17 

 
Participant may deliver electronically the Grant Notice and Exercise Notice called for by Section 4.2 to the Company or to such third party involved in administering the Plan as the Company
may designate from time to time. Such means of electronic delivery may include but do not necessarily include the delivery of a link to a Company intranet or the Internet site of a third party involved in administering the Plan, the delivery of the
document via e-mail or such other means of electronic delivery specified by the Company. 
 (b) Consent to Electronic Delivery. The
Participant acknowledges that the Participant has read Section 19.5(a) of this Option Agreement and consents to the electronic delivery of the Plan documents and, if permitted by the Company, the delivery of the Grant Notice, Exercise Notice
and notices in connection with the Escrow, as described in Section 19.5(a). The Participant acknowledges that he or she may receive from the Company a paper copy of any documents delivered electronically at no cost to the Participant by
contacting the Company by telephone or in writing. The Participant further acknowledges that the Participant will be provided with a paper copy of any documents if the attempted electronic delivery of such documents fails. Similarly, the Participant
understands that the Participant must provide the Company or any designated third party administrator with a paper copy of any documents if the attempted electronic delivery of such documents fails. The Participant may revoke his or her consent to
the electronic delivery of documents described in Section 19.5(a) or may change the electronic mail address to which such documents are to be delivered (if Participant has provided an electronic mail address) at any time by notifying the
Company of such revoked consent or revised e-mail address by telephone, postal service or electronic mail. Finally, the Participant understands that he or she is not required to consent to electronic delivery of documents described in
Section 19.5(a). 
 19.6 Integrated Agreement. The Grant Notice, this Option Agreement and the Plan, together with any
employment, service or other agreement with the Participant and a Participating Company referring to the Option, shall constitute the entire understanding and agreement of the Participant and the Participating Company Group with respect to the
subject matter contained herein or therein and supersede any prior agreements, understandings, restrictions, representations, or warranties among the Participant and the Participating Company Group with respect to such subject matter. To the extent
contemplated herein or therein, the provisions of the Grant Notice, the Option Agreement and the Plan shall survive any exercise of the Option and shall remain in full force and effect. 

19.7 Applicable Law. This Option Agreement shall be governed by the laws of the State of California as such laws are applied to
agreements between California residents entered into and to be performed entirely within the State of California. 
 19.8
Counterparts. The Grant Notice may be executed in counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument. 

  
 18 

							
	 ̈		Incentive Stock Option		Participant:		  

	 ̈		Nonstatutory Stock Option				
					Date:		  

 STOCK OPTION EXERCISE NOTICE 

(Immediately Exercisable) 
 Allergen
Research Corporation 
 Attention: Chief Financial Officer 
 309
University Drive 
 Menlo Park, CA 94025 
 Ladies and
Gentlemen: 
 1. Option. I was granted an option (the “Option”) to purchase shares of
the common stock (the “Shares”) of Allergen Research Corporation (the “Company”) pursuant to the Company’s 2013 Stock Plan (the
“Plan”), my Notice of Grant of Stock Option (the “Grant Notice”) and my Stock Option Agreement (the “Option Agreement”) as follows:

  

							
	 Date of Grant:
			
		 	  
	 
		
	 Number of Option Shares:
			
		 	  
	 
			
	 Exercise Price per Share:
		$		 	             	  
		 		 	  
	  
	 

 2. Exercise of Option. I hereby elect to exercise the Option to purchase the following number of
Shares, in accordance with the Grant Notice and the Option Agreement: 
  

							
	 Vested Shares:
			
		 	  
	 
		
	 Unvested Shares:
			
		 	  
	 
		
	 Total Shares Purchased:
			
		 	  
	 
			
	 Total Exercise Price (Total Shares X Price per Share)
		 $
		 	             	  
		 		 	  
	  
	 

 3. Payments. I enclose payment in full of the total exercise price for the Shares in the
following form(s), as authorized by my Option Agreement: 
  

							
	  ̈
		Cash:		$		
		 		 		 	  

				
	  ̈
		Check:		$		
		 		 		 	  

			
	  ̈
		Stock Tender Exercise:		Contact Plan Administrator
			
	  ̈
		Cashless Exercise:		Contact Plan Administrator
			
	  ̈
		Net Exercise:		Contact Plan Administrator

  
 1 

 4. Tax Withholding. I authorize payroll withholding and otherwise will make
adequate provision for the federal, state, local and foreign tax withholding obligations of the Company, if any, in connection with the Option. If I am exercising a Nonstatutory Stock Option, I enclose payment in full of my withholding taxes, if
any, as follows: 
 (Contact Plan Administrator for amount of tax due.) 

 

							
	  ̈
		Cash:		$		
		  		 		 	  

				
	  ̈
		Check:		$		
		  		 		 	  

 5. Participant Information. 

 

			
	My address is:		  

		
			  

 

			
	My Social Security Number is:		  

 6. Notice of Disqualifying Disposition. If the Option is an Incentive Stock Option, I agree that
I will promptly notify the Chief Financial Officer of the Company if I transfer any of the Shares within one (1) year from the date I exercise all or part of the Option or within two (2) years of the Date of Grant. 

7. Binding Effect. I agree that the Shares are being acquired in accordance with and subject to the terms, provisions and
conditions of the Grant Notice, the Option Agreement, including the Unvested Share Repurchase Option and the Right of First Refusal set forth therein, and the Plan, to all of which I hereby expressly assent. This Agreement shall inure to the benefit
of and be binding upon my heirs, executors, administrators, successors and assigns. If required by the Company, I agree to deposit the certificate(s) evidencing the Shares, along with a blank stock assignment separate from certificate executed by
me, with an escrow agent designated by the Company, to be held pursuant to the escrow provisions contained in the Option Agreement. 
 8.
Transfer. I understand and acknowledge that the Shares have not been registered under the Securities Act of 1933, as amended (the “Securities Act”), and that consequently the Shares must be held
indefinitely unless they are subsequently registered under the Securities Act, an exemption from such registration is available, or they are sold in accordance with Rule 144 or Rule 701 under the Securities Act. I further understand and
acknowledge that the Company is under no obligation to register the Shares. I understand that the certificate or certificates evidencing the Shares will be imprinted with legends which prohibit the transfer of the Shares unless they are registered
or such registration is not required in the opinion of legal counsel satisfactory to the Company. 
 9. Election Under
Section 83(b) of the Code. I understand and acknowledge that if I am exercising the Option to purchase Unvested Shares (i.e., shares that remain subject to the Company’s Unvested Share Repurchase Option), that I should consult with
my tax advisor regarding the advisability of filing with the Internal Revenue Service an election under Section 83(b) of the Code, which must be filed, if at all, no later than thirty (30) days after the date on which I exercise the
Option. I acknowledge that I have been advised to consult with a tax advisor prior to the exercise of the Option regarding the tax consequences to me of exercising the Option and filing or not filing an election under Section 83(b). AN ELECTION
UNDER SECTION 83(b) MUST BE FILED, IF AT ALL, WITHIN 30 DAYS AFTER THE DATE ON WHICH I PURCHASE SHARES. THIS TIME PERIOD CANNOT BE EXTENDED. I ACKNOWLEDGE THAT TIMELY FILING OF A SECTION 83(b) ELECTION, IF APPROPRIATE, IS MY SOLE
RESPONSIBILITY, EVEN IF I REQUEST THE COMPANY OR ITS REPRESENTATIVES TO FILE SUCH ELECTION ON MY BEHALF. 
 I am aware that Rule 144
under the Securities Act, which permits limited public resale of securities acquired in a nonpublic offering, is not currently available with respect to the Shares and, in any event, is available only if certain conditions are satisfied. I
understand that any sale of the Shares that might be made in reliance upon Rule 144 may only be made in limited amounts in accordance with the terms and conditions of such rule and that a copy of Rule 144 will be delivered to me upon
request. 

  
 2 

 I understand that I am purchasing the Shares pursuant to the terms of the Plan, the Grant Notice
and my Option Agreement, copies of which I have received and carefully read and understand. 
  

	
	Very truly yours,
	
	  

	(Signature)

  

			
	Receipt of the above is hereby acknowledged.
	
	ALLERGEN RESEARCH CORPORATION
		
	By:		  

		
	Title:		  

		
	Dated:		  

  
 3 

 ASSIGNMENT SEPARATE FROM CERTIFICATE 

FOR VALUE RECEIVED the undersigned does hereby sell, assign and transfer unto
                                         
                    (                ) shares of the Capital Stock of
Allergen Research Corporation standing in the undersigned’s name on the books of said corporation represented by Certificate No.
                     herewith and does hereby irrevocably constitute and appoint
                                         Attorney
to transfer the said stock on the books of said corporation with full power of substitution in the premises. 
  

			
	Dated:		  

  

	
	  

	Signature
	
	  

	Print 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 exercise its Unvested Share Repurchase Option set forth in the Stock Option Agreement without requiring additional signatures on the part of the Participant.EX-10.5(d)

 Exhibit 10.5(d) 

ALLERGEN RESEARCH CORPORATION 

NOTICE OF GRANT OF RESTRICTED STOCK 
 The
Participant has been granted an award (the “Award”) of certain shares of Stock (the “Shares”) of Allergen Research Corporation pursuant to the Allergen Research Corporation
2013 Stock Plan (the “Plan”), as follows: 
  

							
	Participant:	 	  

		
	Date of Grant:	 	  

		
	Total Number of Shares:	 	  

		 	            , subject to adjustment as provided by the Restricted Stock Agreement.
			
	Fair Market Per Share on Date of Grant:	 	$	 	  

		
	Initial Vesting Date:	 	The date one (1) year after [vesting commencement date]
		
	Vested Shares:	 	Except as provided in the Restricted Stock Agreement, the number of Vested Shares (disregarding any resulting fractional share) as of any date is determined by multiplying the Total Number of Shares by the
“Vested Ratio” determined as of such date as follows:
	 	 	 	 	 	  	 Vested Ratio

			
		 	Prior to Initial Vesting Date	  	0
			
		 	On Initial Vesting Date, provided the Participant’s Service has not terminated prior to such date	  	1/4
			
		 	Plus	  	
			
		 	For each full year of the Participant’s continuous Service from Initial Vesting Date until the Vested Ratio equals 1/1, an additional	  	1/4

 By their signatures below, the Company and the Participant agree that the Award is governed by this Grant
Notice and by the provisions of the Plan and the Restricted Stock Agreement, both of which are attached to and made a part of this document. The Participant acknowledges receipt of copies of the Plan and the Restricted Stock Agreement, represents
that the Participant has read and is familiar with their provisions, and hereby accepts the Award subject to all of their terms and conditions. 

							
	ALLERGEN RESEARCH CORPORATION				PARTICIPANT
				
	By:		  
				  

							Signature
				
	Its:		  
				  

							Date
				
	 Address:
		309 University Drive				  

			Menlo Park, CA 94025				Address
				
							  

  

			
	 ATTACHMENTS:
		2013 Stock Plan, as amended to the Date of Grant; Restricted Stock Agreement, Assignment Separate from Certificate and form of Section 83(b) Election

 THE SECURITIES WHICH ARE THE SUBJECT OF THIS AGREEMENT HAVE NOT BEEN QUALIFIED WITH THE COMMISSIONER OF
CORPORATIONS OF THE STATE OF CALIFORNIA AND THE ISSUANCE OF SUCH SECURITIES OR THE PAYMENT OR RECEIPT OF ANY PART OF THE CONSIDERATION THEREFOR PRIOR TO SUCH QUALIFICATION IS UNLAWFUL, UNLESS THE SALE OF SECURITIES IS EXEMPT FROM QUALIFICATION BY
SECTION 25100, 25102, OR 25105 OF THE CALIFORNIA CORPORATIONS CODE. THE RIGHTS OF ALL PARTIES TO THIS AGREEMENT ARE EXPRESSLY CONDITIONED UPON SUCH QUALIFICATION BEING OBTAINED, UNLESS THE SALE IS SO EXEMPT. 

THE SECURITIES WHICH ARE THE SUBJECT OF THIS AGREEMENT HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION WITH, THE SALE OR
DISTRIBUTION THEREOF. NO SUCH SALE OR DISPOSITION MAY BE EFFECTED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO OR AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT OF
1933. 
 ALLERGEN RESEARCH CORPORATION 

RESTRICTED STOCK AGREEMENT 

Allergen Research Corporation has granted to the Participant named in the Notice of Grant of Restricted Stock (the
“Grant Notice”) to which this Restricted Stock Agreement (the “Agreement”) is attached an Award consisting of Shares subject to the terms and conditions set forth in the
Grant Notice and this Agreement. The Award has been granted pursuant to and shall in all respects be subject to the terms and conditions of the Allergen Research Corporation 2013 Stock Plan (the “Plan”), as
amended to the Date of Grant, the provisions of which are incorporated herein by reference. By signing the Grant Notice, the Participant: (a) acknowledges receipt of, and represents that the Participant has read and is familiar with, the Grant
Notice, this Agreement and the Plan, (b) accepts the Award subject to all of the terms and conditions of the Grant Notice, this Agreement and the Plan, and (c) agrees to accept as binding, conclusive and final all decisions or
interpretations of the Board upon any questions arising under the Grant Notice, this Agreement or the Plan. 
  

	 	1.	DEFINITIONS AND CONSTRUCTION. 

1.1 Definitions. Unless otherwise defined herein, capitalized terms shall have the meanings assigned to such
terms in the Grant Notice or the Plan. 
 1.2 Construction. Captions and titles contained herein
are for convenience only and shall not affect the meaning or interpretation of any provision of this Agreement. Except when otherwise indicated by the context, the singular shall include the plural and the plural shall include the singular. Use of
the term “or” is not intended to be exclusive, unless the context clearly requires otherwise. 

  
 1 

	 	2.	TAX MATTERS. 

2.1 Election under Section 83(b) of the Code. The Participant understands that Section 83 of the Code taxes as ordinary
income the difference between the amount paid for the Shares, if anything, and the fair market value of the Shares as of the date on which the Shares are “substantially vested,” within the meaning of Section 83. In this context,
“substantially vested” means that the right of the Company to reacquire the Shares pursuant to the Company Reacquisition Right has lapsed. The Participant understands that he or she may elect to have his or her taxable income determined at
the time he or she acquires the Shares rather than when and as the Company Reacquisition Right lapses by filing an election under Section 83(b) of the Code with the Internal Revenue Service no later than thirty (30) days after the date of
acquisition of the Shares. The Participant understands that failure to make a timely filing under Section 83(b) will result in his or her recognition of ordinary income, as the Company Reacquisition Right lapses, on the difference between the
purchase price, if anything, and the fair market value of the Shares at the time such restrictions lapse. The Participant further understands, however, that if Shares with respect to which an election under Section 83(b) has been made are
forfeited to the Company pursuant to its Company Reacquisition Right, such forfeiture will be treated as a sale on which there is realized a loss equal to the excess (if any) of the amount paid (if any) by the Participant for the forfeited Shares
over the amount realized (if any) upon their forfeiture. If the Participant has paid nothing for the forfeited Shares and has received no payment upon their forfeiture, the Participant understands that he or she will be unable to recognize any loss
on the forfeiture of the Shares even though the Participant incurred a tax liability by making an election under Section 83(b). 

2.2 Notice to Company. The Participant will notify the Company in writing if the Participant files an election pursuant to
Section 83(b) of the Code. The Company intends, in the event it does not receive from the Participant evidence of such filing, to claim a tax deduction for any amount which would otherwise be taxable to the Participant in the absence of such an
election. 
 2.3 Valuation of the Shares. 

(a) The Shares have been valued by the Company, and the Company believes this valuation represents a fair attempt at reaching an accurate
appraisal of their worth. The Participant understands, however, that the Company can give no assurances that such valuation is in fact the fair market value of the Shares and that it is possible that with the benefit of hindsight, the Internal
Revenue Service would successfully assert that the value of the Shares on any relevant date is greater than so determined. 
 (b) If the
Internal Revenue Service were to succeed in a tax determination under the Code that the Shares received have a value greater than that determined by the Company, the additional value would constitute ordinary income as of the date of the
Participant’s realization of income. The additional taxes (and interest) due would be payable by the Participant, and there is no provision for the Company to reimburse him or her for that tax liability, and the Participant assumes all
responsibility for such potential tax liability. Under present law, in the event such additional value would represent more than twenty-five (25%) of the Participant’s gross income for the year in which the value of the Shares were
taxable, the 

 
Internal Revenue Service would have six (6) years from the due date for filing the return (or the actual filing date of the return if filed thereafter) within which to assess the Participant
the additional tax and interest which would then be due. The Company undertakes no obligation to inform the Participant of any change in the tax laws which may effect this Agreement or its consequences. 

2.4 Consultation with Tax Advisors. The Participant understands that he or she should consult with his or her tax advisor
regarding the advisability of filing with the IRS an election under Section 83(b) of the Code, which must be filed no later than thirty (30) days after the date of the acquisition of the Shares pursuant to this Agreement. Failure to file
an election under Section 83(b), if appropriate, may result in adverse tax consequences to the Participant. The Participant acknowledges that he or she has been advised to consult with a tax advisor regarding the tax consequences to the
Participant of the purchase of Shares hereunder. ANY ELECTION UNDER SECTION 83(b) THE PARTICIPANT WISHES TO MAKE MUST BE FILED NO LATER THAN 30 DAYS AFTER THE DATE ON WHICH THE PARTICIPANT ACQUIRES THE SHARES. THIS TIME PERIOD CANNOT BE EXTENDED.
THE PARTICIPANT ACKNOWLEDGES THAT TIMELY FILING OF A SECTION 83(b) ELECTION IS THE PARTICIPANT’S SOLE RESPONSIBILITY, EVEN IF THE PARTICIPANT REQUESTS THE COMPANY OR ITS REPRESENTATIVE TO FILE SUCH ELECTION ON HIS OR HER BEHALF. 

2.5 Tax Withholding. 

(a) In General. At the time the Grant Notice is executed, or at any time thereafter as requested by a Participating
Company, the Participant hereby authorizes withholding from payroll and any other amounts payable to the Participant, and otherwise agrees to make adequate provision for, any sums required to satisfy the federal, state, local and foreign tax
(including any social insurance) withholding obligations of the Participating Company, if any, which arise in connection with the Award, including, without limitation, obligations arising upon (a) the transfer of Shares to the Participant,
(b) the lapsing of any restriction with respect to any Shares, (c) the filing of an election to recognize tax liability, or (d) the transfer by the Participant of any Shares. The Company shall have no obligation to deliver the Shares
or to release any Shares from the Escrow established pursuant to Section 8 until the tax withholding obligations of the Participating Company have been satisfied by the Participant. 

(b) Withholding in Shares. The Company shall have the right, but not the obligation, to
require the Participant to satisfy all or any portion of a Participating Company’s tax withholding obligations by withholding a number of whole Vested Shares otherwise deliverable to the Participant or by the Participant’s tender to the
Company of a number of whole Vested Shares or vested shares acquired otherwise than pursuant to the Award having, in any such case, a fair market value, as determined by the Company as of the date on which the tax withholding obligations arise, not
in excess of the amount of such tax withholding obligations determined by the applicable minimum statutory withholding rates. 

	 	3.	ADMINISTRATION. 

 All
questions of interpretation concerning the Grant Notice, this Agreement, the Plan or any other form of agreement or other document employed by the Company in the administration of the Plan or the Award shall be determined by the Board. All such
determinations by the Board shall be final, binding and conclusive upon all persons having an interest in the Award, unless fraudulent or made in bad faith. Any and all actions, decisions and determinations taken or made by the Board in the exercise
of its discretion pursuant to the Plan or the Award or other agreement thereunder (other than determining questions of interpretation pursuant to the preceding sentence) shall be final, binding and conclusive upon all persons having an interest in
the Award. Any Officer shall have the authority to act on behalf of the Company with respect to any matter, right, obligation, or election which is the responsibility of or which is allocated to the Company herein, provided the Officer has apparent
authority with respect to such matter, right, obligation, or election. 
  

	 	4.	THE AWARD. 

4.1 Grant and Issuance of Shares. On the Date of Grant, the Participant shall acquire and the Company shall issue, subject to the
provisions of this Agreement, a number of Shares equal to the Total Number of Shares. As a condition to the issuance of the Shares, the Participant shall execute and deliver the Grant Notice to the Company, accompanied by an Assignment Separate from
Certificate duly endorsed (with date and number of shares blank) in the form provided by the Company. 
 4.2 No Monetary
Payment Required. The Participant is not required to make any monetary payment (other than to satisfy applicable tax withholding, if any, with respect to the issuance or vesting of the Shares) as a condition to receiving the Shares, the
consideration for which shall be past services actually rendered or future services to be rendered to a Participating Company or for its benefit. Notwithstanding the foregoing, if required by applicable law, the Participant shall furnish
consideration in the form of cash or past services rendered to a Participating Company or for its benefit having a value not less than the par value of the Shares issued pursuant to the Award. 

4.3 Beneficial Ownership of Shares; Certificate Registration. The Participant hereby authorizes the
Company, in its sole discretion, to deposit the Shares with the Company’s transfer agent, including any successor transfer agent, to be held in book entry form during the term of the Escrow pursuant to Section 8. Furthermore, the
Participant hereby authorizes the Company, in its sole discretion, to deposit, following the term of such Escrow, for the benefit of the Participant with any broker with which the Participant has an account relationship of which the Company has
notice any or all Shares which are no longer subject to such Escrow. Except as provided by the foregoing, a certificate for the Shares shall be registered in the name of the Participant, or, if applicable, in the names of the heirs of the
Participant. 
 4.4 Issuance of Shares in Compliance with Law. The issuance of Shares shall be subject to
compliance with all applicable requirements of federal, state or foreign law with respect to such securities. No Shares shall be issued hereunder if their issuance would constitute a violation of any applicable federal, state or foreign securities
laws or other law or 

 
regulations or the requirements of any stock exchange or market system upon which the Stock may then be listed. The inability of the Company to obtain from any regulatory body having jurisdiction
the authority, if any, deemed by the Company’s legal counsel to be necessary to the lawful issuance of any Shares shall relieve the Company of any liability in respect of the failure to issue such Shares as to which such requisite authority
shall not have been obtained. As a condition to the issuance of the Shares, the Company may require the Participant to satisfy any qualifications that may be necessary or appropriate, to evidence compliance with any applicable law or regulation and
to make any representation or warranty with respect thereto as may be requested by the Company. 
  

	 	5.	VESTING OF SHARES. 

Shares acquired pursuant to this Agreement shall become Vested Shares as provided in the Grant Notice. For purposes of determining the number
of Vested Shares following an Ownership Change Event, credited Service shall include all Service with any corporation which is a Participating Company at the time the Service is rendered, whether or not such corporation is a Participating Company
both before and after the Ownership Change Event. 
  

	 	6.	COMPANY REACQUISITION RIGHT. 

6.1 Grant of Company Reacquisition Right. In the event that (a) the Participant’s Service
terminates for any reason or no reason, with or without cause, or, (b) the Participant, the Participant’s legal representative, or other holder of the Shares, attempts to sell, exchange, transfer, pledge, or otherwise dispose of (other
than pursuant to an Ownership Change Event), including, without limitation, any transfer to a nominee or agent of the Participant, any Shares which are not Vested Shares (“Unvested
Shares”), the Participant shall forfeit and the Company shall automatically reacquire the Unvested Shares, and the Participant shall not be entitled to any payment therefor (the “Company
Reacquisition Right”).  
 6.2 Ownership Change Event, Dividends, Distributions and
Adjustments. Upon the occurrence of an Ownership Change Event, a dividend or distribution to the stockholders of the Company paid in shares of Stock or other property, or any other adjustment upon a change in the capital
structure of the Company as described in Section 10, any and all new, substituted or additional securities or other property (other than regular, periodic dividends paid on Stock pursuant to the Company’s dividend policy) to which the
Participant is entitled by reason of the Participant’s ownership of Unvested Shares shall be immediately subject to the Company Reacquisition Right and included in the terms “Shares,” “Stock” and “Unvested Shares”
for all purposes of the Company Reacquisition Right with the same force and effect as the Unvested Shares immediately prior to the Ownership Change Event, dividend, distribution or adjustment, as the case may be. For purposes of determining the
number of Vested Shares following an Ownership Change Event, dividend, distribution or adjustment, credited Service shall include all Service with any corporation which is a Participating Company at the time the Service is rendered, whether or not
such corporation is a Participating Company both before and after any such event. 

	 	7.	RIGHT OF FIRST REFUSAL. 

7.1 Grant of Right of First Refusal. Except as provided in Section 7.7 and Section 14 below, in
the event the Participant, the Participant’s legal representative, or other holder of shares subject to the Award proposes to sell, exchange, transfer, pledge, or otherwise dispose of any Vested Shares (the
“Transfer Shares”) to any person or entity, including, without limitation, any stockholder of a Participating Company, the Company shall have the right to repurchase the Transfer
Shares under the terms and subject to the conditions set forth in this Section (the “Right of First Refusal”). 

7.2 Notice of Proposed Transfer. Prior to any proposed transfer of the Transfer Shares, the Participant
shall deliver written notice (the “Transfer Notice”) to the Company describing fully the proposed transfer, including the number of Transfer Shares, the name and address of the
proposed transferee (the “Proposed Transferee”) and, if the transfer is voluntary, the proposed transfer price, and containing such information necessary to show the bona fide nature
of the proposed transfer. In the event of a bona fide gift or involuntary transfer, the proposed transfer price shall be deemed to be the Fair Market Value of the Transfer Shares, as determined by the Board in good faith. If the Participant proposes
to transfer any Transfer Shares to more than one Proposed Transferee, the Participant shall provide a separate Transfer Notice for the proposed transfer to each Proposed Transferee. The Transfer Notice shall be signed by both the Participant and the
Proposed Transferee and must constitute a binding commitment of the Participant and the Proposed Transferee for the transfer of the Transfer Shares to the Proposed Transferee subject only to the Right of First Refusal. 

7.3 Bona Fide Transfer. If the Company determines that the information provided by the Participant in the
Transfer Notice is insufficient to establish the bona fide nature of a proposed voluntary transfer, the Company shall give the Participant written notice of the Participant’s failure to comply with the procedure described in this
Section 7, and the Participant shall have no right to transfer the Transfer Shares without first complying with the procedure described in this Section 7. The Participant shall not be permitted to transfer the Transfer Shares if the
proposed transfer is not bona fide. 
 7.4 Exercise of Right of First Refusal. If the Company determines
the proposed transfer to be bona fide, the Company shall have the right to purchase all, but not less than all, of the Transfer Shares (except as the Company and the Participant otherwise agree) at the purchase price and on the terms set forth in
the Transfer Notice by delivery to the Participant of a notice of exercise of the Right of First Refusal within thirty (30) days after the date the Transfer Notice is delivered to the Company. The Company’s exercise or failure to exercise
the Right of First Refusal with respect to any proposed transfer described in a Transfer Notice shall not affect the Company’s right to exercise the Right of First Refusal with respect to any proposed transfer described in any other Transfer
Notice, whether or not such other Transfer Notice is issued by the Participant or issued by a person other than the Participant with respect to a proposed transfer to the same Proposed Transferee. If the Company exercises the Right of First Refusal,
the Company and the Participant shall thereupon consummate the sale of the Transfer Shares to the Company on the terms set forth in the Transfer Notice within sixty (60) days after the date the Transfer Notice is delivered to the Company
(unless a longer period is offered by the Proposed Transferee); provided, however, that in the event the Transfer Notice provides for the 

 
payment for the Transfer Shares other than in cash, the Company shall have the option of paying for the Transfer Shares by the present value cash equivalent of the consideration described in the
Transfer Notice as reasonably determined by the Company. For purposes of the foregoing, cancellation of any indebtedness of the Participant to any Participating Company shall be treated as payment to the Participant in cash to the extent of the
unpaid principal and any accrued interest canceled. Notwithstanding anything contained in this Section to the contrary, the period during which the Company may exercise the Right of First Refusal and consummate the purchase of the Transfer Shares
from the Participant shall terminate no sooner than the completion of a period of eight (8) months following the date on which the Participant acquired the Transfer Shares. 

7.5 Failure to Exercise Right of First Refusal. If the Company fails to exercise the Right of First Refusal
in full (or to such lesser extent as the Company and the Participant otherwise agree) within the period specified in Section 7.4, the Participant may conclude a transfer to the Proposed Transferee of the Transfer Shares on the terms and
conditions described in the Transfer Notice, provided such transfer occurs not later than ninety (90) days following delivery to the Company of the Transfer Notice or, if applicable, following the end of the period described in the last
sentence of Section 7.4. The Company shall have the right to demand further assurances from the Participant and the Proposed Transferee (in a form satisfactory to the Company) that the transfer of the Transfer Shares was actually carried out on
the terms and conditions described in the Transfer Notice. No Transfer Shares shall be transferred on the books of the Company until the Company has received such assurances, if so demanded, and has approved the proposed transfer as bona fide. Any
proposed transfer on terms and conditions different from those described in the Transfer Notice, as well as any subsequent proposed transfer by the Participant, shall again be subject to the Right of First Refusal and shall require compliance by the
Participant with the procedure described in this Section. 
 7.6 Transferees of Transfer Shares.
All transferees of the Transfer Shares or any interest therein, other than the Company, shall be required as a condition of such transfer to agree in writing (in a form satisfactory to the Company) that such transferee shall receive and hold such
Transfer Shares or interest therein subject to all of the terms and conditions of this Agreement, including this Section 7 providing for the Right of First Refusal with respect to any subsequent transfer. Any sale or transfer of any Shares
shall be void unless the provisions of this Section are met. 
 7.7 Transfers Not Subject to Right of First
Refusal. The Right of First Refusal shall not apply to any transfer or exchange of the Shares if such transfer or exchange is in connection with an Ownership Change Event. If the consideration received pursuant to such
transfer or exchange consists of stock of a Participating Company, such consideration shall remain subject to the Right of First Refusal unless the provisions of Section 7.9 result in a termination of the Right of First Refusal. 

7.8 Assignment of Right of First Refusal. The Company shall have the right to assign the Right of First
Refusal at any time, whether or not there has been an attempted transfer, to one or more persons as may be selected by the Company. 

 7.9 Early Termination of Right of First Refusal. The other
provisions of this Agreement notwithstanding, the Right of First Refusal shall terminate and be of no further force and effect upon (a) the occurrence of a Change in Control, unless the Acquiror assumes the Company’s rights and obligations
under this Agreement, or (b) the existence of a public market for the class of shares subject to the Right of First Refusal. A “public market” shall be deemed to exist if
(i) such stock is listed on a national securities exchange (as that term is used in the Exchange Act) or (ii) such stock is traded on the over-the-counter
market and prices therefor are published daily on business days in a recognized financial journal. 
  

	 	8.	ESCROW. 

 8.1 Appointment of Agent. To
ensure that Shares subject to the Company Reacquisition Right will be available for reacquisition, the Participant and the Company hereby appoint the Secretary of the Company, or any other person designated by the Company, as their agent and as
attorney-in-fact for the Participant (the “Agent”) to hold any and all Unvested Shares and to sell, assign and transfer to the Company any such Unvested Shares reacquired by the
Company pursuant to the Company Reacquisition Right. The Participant understands that appointment of the Agent is a material inducement to make this Agreement and that such appointment is coupled with an interest and is irrevocable. The Agent shall
not be personally liable for any act the Agent may do or omit to do hereunder as escrow agent, agent for the Company, or attorney in fact for the Participant while acting in good faith and in the exercise of the Agent’s own good judgment, and
any act done or omitted by the Agent pursuant to the advice of the Agent’s own attorneys shall be conclusive evidence of such good faith. The Agent may rely upon any letter, notice or other document executed by any signature purporting to be
genuine and may resign at any time. 
 8.2 Establishment of Escrow. The Participant authorizes the
Company to deposit the Unvested Shares with the Company’s transfer agent to be held in book entry form, as provided by Section 4.3, and the Participant agrees to deliver to and deposit with the Agent each certificate, if any, evidencing
the Shares and an Assignment Separate from Certificate with respect to such book entry shares and each such certificate duly endorsed (with date and number of Shares blank) in the form attached to this Agreement, to be held by the Agent under the
terms and conditions of this Section (the “Escrow”). Upon the occurrence of an Ownership Change Event, a dividend or distribution to the stockholders of the Company paid in shares of
Stock or other property (other than regular, periodic dividends paid on Stock pursuant to the Company’s dividend policy), or any other adjustment upon a change in the capital structure of the Company, as described in Section 10, any and
all new, substituted or additional securities or other property to which the Participant is entitled by reason of his or her ownership of the Shares that remain, following such Ownership Change Event, dividend, distribution or change described in
Section 10, subject to the Company Reacquisition Right shall be immediately subject to the Escrow to the same extent as the Shares immediately before such event. The Company shall bear the expenses of the Escrow. 

8.3 Delivery of Shares to Participant. The Escrow shall continue with respect to any Shares for so long as such
Shares remain subject to the Company Reacquisition Right. Upon termination of the Company Reacquisition Right with respect to Shares, the Company shall so notify the Agent and direct the Agent to deliver such number of Shares to the

 
Participant. As soon as practicable after receipt of such notice, the Agent shall cause the Shares specified by such notice to be delivered to the Participant, and the Escrow shall terminate with
respect to such Shares. 
 8.4 Notices and Payments. In the event the Shares and any other property held
in escrow are subject to the Company’s exercise of the Company Reacquisition Right or the Right of First Refusal, the notices required to be given to the Participant shall be given to the Agent, and any payment required to be given to the
Participant shall be given to the Agent. Within thirty (30) days after payment by the Company, the Agent shall deliver the Shares and any other property which the Company has purchased to the Company and shall deliver the payment received from
the Company to the Participant.  
  

	 	9.	EFFECT OF CHANGE IN CONTROL. 

In the event of a Change in Control, except to the extent that the Board determines to settle the Award in accordance with Section 9.1(c)
of the Plan, the surviving, continuing, successor, or purchasing corporation or other business entity or parent thereof, as the case may be (the “Acquiror”), may, without the consent of the Participant, assume
or continue in full force and effect the Company’s rights and obligations under the Award or substitute for the Award a substantially equivalent award for the Acquiror’s stock. For purposes of this Section, the Award shall be deemed
assumed if, following the Change in Control, the Award confers the right to receive, subject to the terms and conditions of the Plan and this Agreement, for each Share subject to the Award immediately prior to the Change in Control, the
consideration (whether stock, cash, other securities or property or a combination thereof) to which a holder of a share of Stock on the effective date of the Change in Control was entitled. Notwithstanding the foregoing, Shares acquired pursuant to
the Award prior to the Change in Control and any consideration received pursuant to the Change in Control with respect to such shares shall continue to be subject to all applicable provisions of this Agreement except as otherwise provided herein.

  

	 	10.	ADJUSTMENTS FOR CHANGES IN CAPITAL STRUCTURE. 

Subject to any required action by the stockholders of the Company, in the event of any change in the Stock effected without receipt of
consideration by the Company, whether through merger, consolidation, reorganization, reincorporation, recapitalization, reclassification, stock dividend, stock split, reverse stock split, split-up, split-off, spin-off, combination of shares,
exchange of shares, or similar change in the capital structure of the Company, or in the event of payment of a dividend or distribution to the stockholders of the Company in a form other than Stock (excepting regular, periodic cash dividends) that
has a material effect on the Fair Market Value of shares of Stock, appropriate and proportionate adjustments shall be made in the number and kind of shares of stock or other property subject to the Award, in order to prevent dilution or enlargement
of the Participant’s rights under the Award. For purposes of the foregoing, conversion of any convertible securities of the Company shall not be treated as “effected without receipt of consideration by the Company.” Any and all new,
substituted or additional securities or other property to which Participant is entitled by reason of ownership of Shares acquired pursuant to this Award will be immediately subject to the provisions of this Award on the same basis as all Shares
originally acquired hereunder. Any fractional share resulting from an 

 
adjustment pursuant to this Section shall be rounded down to the nearest whole number. Such adjustments shall be determined by the Board, and its determination shall be final, binding and
conclusive. 
  

	 	11.	RIGHTS AS A STOCKHOLDER, DIRECTOR, EMPLOYEE OR CONSULTANT.

 The Participant shall have no rights as a stockholder with respect to any Shares subject to the Award until the date of the
issuance of the Shares (as evidenced by the appropriate entry on the books of the Company or of a duly authorized transfer agent of the Company). No adjustment shall be made for dividends, distributions or other rights for which the record date is
prior to the date the Shares are issued, except as provided in Section 10. Subject to the provisions of this Agreement, the Participant shall exercise all rights and privileges of a stockholder of the Company with respect to Shares deposited in
the Escrow pursuant to Section 8. If the Participant is an Employee, the Participant understands and acknowledges that, except as otherwise provided in a separate, written employment agreement between a Participating Company and the
Participant, the Participant’s employment is “at will” and is for no specified term. Nothing in this Agreement shall confer upon the Participant any right to continue in the Service of a Participating Company or interfere in any way
with any right of the Participating Company Group to terminate the Participant’s Service, as the case may be, at any time. 
  

	 	12.	LEGENDS. 

 The Company may at any time place legends
referencing the Company Reacquisition Right, Right of First Refusal and any applicable federal, state or foreign securities law restrictions on all certificates representing Shares. The Participant shall, at the request of the Company, promptly
present to the Company any and all certificates representing Shares in the possession of the Participant in order to carry out the provisions of this Section. Unless otherwise specified by the Company, legends placed on such certificates may
include, but shall not be limited to, the following: 
 12.1 “THE SECURITIES EVIDENCED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD, TRANSFERRED, ASSIGNED OR HYPOTHECATED UNLESS THERE IS AN EFFECTIVE REGISTRATION STATEMENT UNDER SUCH ACT COVERING SUCH SECURITIES, THE SALE IS MADE IN ACCORDANCE WITH RULE 144 OR
RULE 701 UNDER THE ACT, OR THE COMPANY RECEIVES AN OPINION OF COUNSEL REASONABLY SATISFACTORY TO THE COMPANY, STATING THAT SUCH SALE, TRANSFER, ASSIGNMENT OR HYPOTHECATION IS EXEMPT FROM THE REGISTRATION AND PROSPECTUS DELIVERY REQUIREMENTS OF
SUCH ACT.” 
 12.2 “THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO CERTAIN RESTRICTIONS ON TRANSFER AND REPURCHASE
OPTIONS IN FAVOR OF THE CORPORATION OR ITS ASSIGNEE SET FORTH IN AN AGREEMENT BETWEEN THE CORPORATION AND THE REGISTERED HOLDER, OR SUCH HOLDER’S PREDECESSOR IN INTEREST, A COPY OF WHICH IS ON FILE AT THE PRINCIPAL OFFICE OF THIS
CORPORATION.” 

	 	13.	LOCK-UP AGREEMENT. 

The Participant hereby agrees that in the event of any underwritten public offering of stock, including an initial public offering of stock,
made by the Company pursuant to an effective registration statement filed under the Securities Act, the Participant shall not offer, sell, contract to sell, pledge, hypothecate, grant any option to purchase or make any short sale of, or otherwise
dispose of any shares of stock of the Company or any rights to acquire stock of the Company for such period of time from and after the effective date of such registration statement as may be established by the underwriter for such public offering;
provided, however, that such period of time shall not exceed one hundred eighty (180) days from the effective date of the registration statement to be filed in connection with such public offering; provided, further, however, that such one
hundred eighty (180) day period may be extended for an additional period, not to exceed twenty (20) days, upon the request of the Company or the underwriter to accommodate regulatory restrictions on (i) the publication or other
distribution of research reports and (ii) analyst recommendations and opinions, including but not limited to, the restrictions contained in NASD Rule 2711(f)(4) or NYSE Rule 472(f)(4), or any successor provisions or amendments thereto). The
foregoing limitation shall not apply to shares registered in the public offering under the Securities Act. The Participant hereby agrees to enter into any agreement reasonably required by the underwriters to implement the foregoing within a
reasonable timeframe if so requested by the Company. 
  

	 	14.	RESTRICTIONS ON TRANSFER OF SHARES. 

At any time prior to the existence of a public market for the Stock, the Board may prohibit the Participant and any transferee of
such Participant from selling, transferring, assigning, pledging, or otherwise disposing of or encumbering any Shares acquired pursuant to the Award (each, a “Transfer”) without the
prior written consent of the Board. The Board may withhold consent for any reason, including without limitation any Transfer (i) to any individual or entity identified by the Company as a potential competitor or considered by the Company to be
unfriendly, or (ii) if such Transfer increases the risk of the Company having a class of security held of record by such number of persons as would require the Company to register any class of securities under the Exchange Act; or (iii) if
such Transfer would result in the loss of any federal or state securities law exemption relied upon by the Company in connection with the initial issuance of such shares or the issuance of any other securities; or (iv) if such Transfer is
facilitated in any manner by any public posting, message board, trading portal, Internet site, or similar method of communication, including without limitation any trading portal or Internet site intended to facilitate secondary transfers of
securities; or (v) if such Transfer is to be effected in a brokered transaction; or (vi) if such Transfer would be of less than all of the shares of Stock then held by the stockholder and its affiliates or is to be made to more than a
single transferee. No Shares may be sold, exchanged, transferred, assigned, pledged, hypothecated or otherwise disposed of, including by operation of law, in any manner which violates any of the provisions of this Agreement and, except pursuant to
an Ownership Change Event, until the date on which such shares become Vested Shares, and any such attempted disposition shall be void. The Company shall not be required (a) to transfer on its books any Shares which will have been transferred in
violation of any of the provisions set forth in this Agreement or (b) to treat as owner of such Shares or to accord the right to vote as such owner or to pay dividends to any transferee to whom such Shares will have been so transferred. In
order to enforce its rights under this Section, the Company shall be authorized to give a stop transfer instruction with respect to the Shares to the Company’s transfer agent. 

	 	15.	MISCELLANEOUS PROVISIONS. 

 15.1
Termination or Amendment. The Board may terminate or amend the Plan or this Agreement at any time; provided, however, that no such termination or amendment may adversely affect the Participant’s rights under this Agreement without the
consent of the Participant, unless such termination or amendment is necessary to comply with any applicable law or government regulation. No amendment or addition to this Agreement shall be effective unless in writing. 

15.2 Nontransferability of the Award. The right to acquire Shares pursuant to the Award shall not be subject in any manner to
anticipation, alienation, sale, exchange, transfer, assignment, pledge, encumbrance, or garnishment by creditors of the Participant or the Participant’s beneficiary, except transfer by will or by the laws of descent and distribution. All rights
with respect to the Award shall be exercisable during the Participant’s lifetime only by the Participant or the Participant’s guardian or legal representative. 

15.3 Further Instruments. The parties hereto agree to execute such further instruments and to take such further action as may
reasonably be necessary to carry out the intent of this Agreement. 
 15.4 Binding Effect. This Agreement shall inure
to the benefit of the successors and assigns of the Company and, subject to the restrictions on transfer set forth herein, be binding upon the Participant and the Participant’s heirs, executors, administrators, successors and assigns.

 15.5 Delivery of Documents and Notices. Any document relating to participation in the Plan, or any notice required or
permitted hereunder shall be given in writing and shall be deemed effectively given (except to the extent that this Agreement provides for effectiveness only upon actual receipt of such notice) upon personal delivery, electronic delivery at the
e-mail address, if any, provided for the Participant by a Participating Company, or upon deposit in the U.S. Post Office or foreign postal service, by registered or certified mail, or with a nationally recognized overnight courier service, with
postage and fees prepaid, addressed to the other party at the address of such party set forth in the Grant Notice or at such other address as such party may designate in writing from time to time to the other party. 

(a) Description of Electronic Delivery. The Plan documents, which may include but do not necessarily include: the Plan, the
Grant Notice, this Agreement, and any reports of the Company provided generally to the Company’s stockholders, may be delivered to the Participant electronically. In addition, if permitted by the Company, the Participant may deliver
electronically the Grant Notice to the Company or to such third party involved in administering the Plan as the Company may designate from time to time. Such means of electronic delivery may include but do not necessarily include the delivery of a
link to a Company intranet or the Internet site of a third party involved in administering the Plan, the delivery of the document via e-mail or such other means of electronic delivery specified by the Company. 

 (b) Consent to Electronic Delivery. The Participant acknowledges that the
Participant has read Section 15.5(a) of this Agreement and consents to the electronic delivery of the Plan documents and, if permitted by the Company, the delivery of the Grant Notice and notices in connection with the Escrow, as described in
Section 15.5(a). The Participant acknowledges that he or she may receive from the Company a paper copy of any documents delivered electronically at no cost to the Participant by contacting the Company by telephone or in writing. The Participant
further acknowledges that the Participant will be provided with a paper copy of any documents if the attempted electronic delivery of such documents fails. Similarly, the Participant understands that the Participant must provide the Company or any
designated third party administrator with a paper copy of any documents if the attempted electronic delivery of such documents fails. The Participant may revoke his or her consent to the electronic delivery of documents described in
Section 15.5(a) or may change the electronic mail address to which such documents are to be delivered (if Participant has provided an electronic mail address) at any time by notifying the Company of such revoked consent or revised e-mail
address by telephone, postal service or electronic mail. Finally, the Participant understands that he or she is not required to consent to electronic delivery of documents described in Section 15.5(a). 

15.6 Integrated Agreement. The Grant Notice, this Agreement and the Plan, together with any employment, service or other
agreement between the Participant and a Participating Company referring to the Award, shall constitute the entire understanding and agreement of the Participant and the Participating Company Group with respect to the subject matter contained herein
or therein and supersede any prior agreements, understandings, restrictions, representations, or warranties among the Participant and the Participating Company Group with respect to such subject matter. To the extent contemplated herein or therein,
the provisions of the Grant Notice, this Agreement and the Plan shall survive any settlement of the Award and shall remain in full force and effect. 

15.7 Applicable Law. The Agreement shall be governed by the laws of the State of California as such laws are applied to
agreements between California residents entered into and to be performed entirely within the State of California. 
 15.8
Counterparts. The Grant Notice may be executed in counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument. 

 ASSIGNMENT SEPARATE FROM CERTIFICATE 

FOR VALUE RECEIVED the undersigned does hereby sell, assign and transfer unto
                                         
                   (                ) shares of the Capital Stock of
Allergen Research Corporation standing in the undersigned’s name on the books of said corporation represented by Certificate No.
                    herewith and does hereby irrevocably constitute and appoint
                                        Attorney
to transfer the said stock on the books of said corporation with full power of substitution in the premises. 
  

							
	Dated:		  
				
				
							  

							Signature
				
							  

							Print 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 exercise its Company Reacquisition Right set forth in the Restricted Stock Agreement without requiring additional signatures on the part of the Participant. 

 SAMPLE 
  

	
	Internal Revenue Service
	  

	  

	 [IRS Service Center
 where Form 1040 is
Filed]

  

	Re:	Section 83(b) Election 

 Dear Sir or Madam: 

The following information is submitted pursuant to section 1.83-2 of the Treasury Regulations in connection with this election by the undersigned under
section 83(b) of the Internal Revenue Code of 1986, as amended (the “Code”). 
  

	1.	The name, address and taxpayer identification number of the taxpayer are: 

  

			
	Name:		  

		
	Address:		  

		
			  

			
		
	Social Security Number:		  

  

	2.	The following is a description of each item of property with respect to which the election is made: 

                shares of common stock of Allergen Research
Corporation (the “Shares”), acquired from Allergen Research Corporation (the “Company”) pursuant to a restricted stock grant. 
  

	3.	The property was transferred to the undersigned on: 

 Restricted stock grant date:
                                        

 The taxable year for which the election is made is: 

Calendar Year
                         
  

	4.	The nature of the restriction to which the property is subject: 

 The Shares are subject to
automatic forfeiture to the Company upon the occurrence of certain events. This forfeiture provision lapses with regard to a portion of the Shares based upon the continued performance of services by the taxpayer over time. 

	5.	The following is the fair market value at the time of transfer (determined without regard to any restriction other than a restriction which by its terms will never lapse) of the property with respect to which the
election is made: 

$                (       
         Shares at $                per share). 

The property was transferred to the taxpayer pursuant to the grant of an award of restricted stock. 

 

	6.	The following is the amount paid for the property: 

 No monetary consideration was provided in
exchange for the Shares. 
  

	7.	A copy of this election has been furnished to the Company, the corporation for which the services were performed by the undersigned. 

Please acknowledge receipt of this election by date or received-stamping the enclosed copy of this letter and returning it to the undersigned. A
self-addressed stamped envelope is provided for your convenience. 
 Very truly yours, 

							
				
	  
				Date:		  

 Enclosures 
 cc: Allergen
Research Corporation

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