Document:

EX-10.6

 Exhibit 10.6 
 VITAL THERAPIES, INC. 
 2012 STOCK OPTION PLAN 

(amended April 26, 2012) 
 (amended September 25, 2012) 
 (amended July 2, 2013)

 (amended September 9, 2013) 
  

	 	1.	ESTABLISHMENT, PURPOSE AND TERM OF
PLAN. 

 1.1 Establishment. The Vital Therapies, Inc.
2012 Stock Option Plan (the “Plan”) is hereby established effective as of April 1, 2012. 
 1.2
Purpose. The purpose of the Plan is to advance the interests of the Participating Company Group and its shareholders by providing an incentive to attract, retain and reward persons performing services for the Participating Company
Group and by motivating such persons to contribute to the growth and profitability of the Participating Company Group. 
 1.3
Term of Plan. The Plan shall continue in effect until the earlier of its termination by the Board or the date on which all of the shares of Stock available for issuance under the Plan have been issued and all restrictions on such
shares under the terms of the Plan and the agreements evidencing Options granted under the Plan have lapsed. However, all Options shall be granted, if at all, within ten (10) years from the earlier of the date the Plan is adopted by the
Board or the date the Plan is duly approved by the shareholders of the Company. 
  

	 	2.	DEFINITIONS AND CONSTRUCTION. 

2.1 Definitions. Whenever used herein, the following terms shall have their respective meanings set forth below: 

(a) “Board” means the Board of Directors of the Company. If one or more Committees have been appointed by the
Board to administer the Plan, “Board” also means such Committee(s). 
 (b)
“Code” means the Internal Revenue Code of 1986, as amended, and any applicable regulations promulgated thereunder. 
 (c) “Committee” means the Compensation Committee or other committee of the Board duly appointed to administer the Plan and having such powers as shall be specified by the Board.
Unless the powers of the Committee have been specifically limited, the Committee shall have all of the powers of the Board granted herein, including, without limitation, the power to amend or terminate the Plan at any time, subject to the terms of
the Plan and any applicable limitations imposed by law. If the Company shall register its Stock under the Securities Act, then the Committee shall consist of at least two or more individuals meeting both the “Nonemployee Director” standard
set forth in Rule 16b-3 and the “Outside Director” standard set forth in the regulations promulgated under Section 162(m) of the Code. 
 (d) “Company” means Vital Therapies, Inc., a Delaware corporation, or any successor corporation thereto. 

 (e) “Consultant” means a person engaged to provide consulting or
advisory services (other than as an Employee or a Director) to a Participating Company, provided that the identity of such person, the nature of such services or the entity to which such services are provided would not preclude the Company from
offering or selling securities to such person pursuant to the Plan in reliance on either the exemption from registration provided by Rule 701 under the Securities Act or, if the Company is required to file reports pursuant to Section 13 or
15(d) of the Exchange Act, registration on a Form S-8 Registration Statement under the Securities Act. 
 (f)
“Director” means a member of the Board or of the board of directors of any other Participating Company. 
 (g) “Disability” means the inability of the Optionee, in the opinion of a qualified physician acceptable to the Company, to perform the major duties of the Optionee’s position
with the Participating Company Group because of the sickness or injury of the Optionee. 
 (h)
“Employee” means any person treated as an employee (including an Officer or a Director who is also treated as an employee) in the records of a Participating Company and, with respect to any Incentive Stock Option granted to
such person, who is an employee for purposes of Section 422 of the Code; provided, however, that neither service as a Director nor payment of a director’s fee shall be sufficient to constitute employment for purposes of the Plan. The
Company shall determine in good faith and in the exercise of its discretion whether an individual has become or has ceased to be an Employee and the effective date of such individual’s employment or termination of employment, as the case may
be. For purposes of an individual’s rights, if any, under the Plan as of the time of the Company’s determination, all such determinations by the Company shall be final, binding and conclusive, notwithstanding that the Company or any court
of law or governmental agency subsequently makes a contrary determination. 
 (i) “Exchange Act” means
the Securities Exchange Act of 1934, as amended. 
 (j) “Fair Market Value” means, as of any date, the
value of a share of Stock or other property as determined by the Board, in its discretion, or by the Company, in its discretion, if such determination is expressly allocated to the Company herein, subject to the following: 

(i) If, on such date, the Stock is listed on a national or regional securities exchange or market system, the Fair Market Value of a
share of Stock shall be the closing price of a share of Stock (or the mean of the closing bid and asked prices of a share of Stock if the Stock is so quoted instead) as quoted on the Nasdaq National Market, The Nasdaq SmallCap Market or such other
national or regional securities exchange or market system constituting the primary market for the Stock, as reported in The Wall Street Journal or such other source as the Company deems reliable. If the relevant date does not fall on a
day on which the Stock has traded on such securities exchange or market system, the date on which the Fair Market Value shall be established shall be the last day on which the Stock was so traded prior to the relevant date, or such other appropriate
day as shall be determined by the Board, in its discretion. 
 (ii) If, on such date, the Stock is not listed on a national or
regional securities exchange or market system, the Fair Market Value of a share of Stock shall be as determined by the Board in good faith without regard to any restriction other than a restriction that, by its terms, will never lapse. 

  
 -2-

 (k) “Incentive Stock Option” means an Option intended to be (as set
forth in the Option Agreement) and that qualifies as an incentive stock option within the meaning of Section 422(b) of the Code. 
 (l) “Insider” means an Officer, a Director of the Company or other person whose transactions in Stock are subject to Section 16 of the Exchange Act. 

(m) “Nonstatutory Stock Option” means an Option not intended to be (as set forth in the Option Agreement) or
which does not qualify as an Incentive Stock Option. 
 (n) “Officer” means any person designated by
the Board as an officer of the Company. 
 (o) “Option” means a right to purchase Stock pursuant to the
terms and conditions of the Plan. An Option may be either an Incentive Stock Option or a Nonstatutory Stock Option. 
 (p)
“Option Agreement” means a written agreement between the Company and an Optionee setting forth the terms, conditions and restrictions of the Option granted to the Optionee and any shares acquired upon the exercise thereof. An
Option Agreement may consist of a form of “Notice of Grant of Stock Option” and a form of “Stock Option Agreement” incorporated therein by reference, or such other form or forms as the Board may approve from time to time.

 (q) “Optionee” means a person who has been granted one or more Options. 

(r) “Parent Corporation” means any present or future “parent corporation” of the Company, as defined
in Section 424(e) of the Code. 
 (s) “Participating Company” means the Company or any Parent
Corporation or Subsidiary Corporation. 
 (t) “Participating Company Group” means, at any point in
time, all corporations collectively that are then Participating Companies. 
 (u) “Rule 16b-3”
means Rule 16b-3 under the Exchange Act, as amended from time to time, or any successor rule or regulation. 
 (v)
“Securities Act” means the Securities Act of 1933, as amended. 

  
 -3-

 (w) “Service” means an Optionee’s employment or service with
the Participating Company Group, whether in the capacity of an Employee, a Director or a Consultant. An Optionee’s Service shall not be deemed to have terminated merely because of a change in the capacity in which the Optionee renders Service
to the Participating Company Group or a change in the Participating Company for which the Optionee renders such Service, provided that there is no interruption or termination of the Optionee’s Service. Furthermore, an Optionee’s Service
with the Participating Company Group shall not be deemed to have terminated if the Optionee takes any military leave, sick leave, or other bona fide leave of absence approved by the Company; provided, however, that if any such leave exceeds ninety
(90) days, on the ninety-first (91st) day of such leave the Optionee’s Service shall be deemed to have terminated unless the Optionee’s right to return to Service with the Participating Company Group is guaranteed by statute or
contract. Notwithstanding the foregoing, unless otherwise designated by the Company or required by law, a leave of absence shall not be treated as Service for purposes of determining vesting under the Optionee’s Option Agreement. The
Optionee’s Service shall be deemed to have terminated either upon an actual termination of Service or upon the corporation for which the Optionee performs Service ceasing to be a Participating Company. Subject to the foregoing, the Company, in
its discretion, shall determine whether the Optionee’s Service has terminated and the effective date of such termination. 

(x) “Stock” means the common stock of the Company, as adjusted from time to time in accordance with
Section 4.2. 
 (y) “Subsidiary Corporation” means any present or future “subsidiary
corporation” of the Company, as defined in Section 424(f) of the Code. 
 (z) “Ten Percent Owner
Optionee” means an Optionee who, at the time an Option is granted to the Optionee, owns stock possessing more than ten percent (10%) of the total combined voting power of all classes of stock of a Participating Company within the
meaning of Section 422(b)(6) of the Code. 
 2.2 Construction. Captions and titles contained herein are for
convenience only and shall not affect the meaning or interpretation of any provision of the Plan. 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. 
  

	 	3.	ADMINISTRATION. 

 3.1 Administration by the Board. The Plan shall be administered by the Board. All questions of interpretation of the Plan or of any Option shall be determined by the Board, and such
determinations shall be final and binding upon all persons having an interest in the Plan or such Option. 
 3.2 Authority of
Officers. Any Officer shall have the authority to act on behalf of the Company with respect to any matter, right, obligation, determination or election which is the responsibility of or which is allocated to the Company herein, provided
the Officer has the express authority of the Board with respect to such matter, right, obligation, determination or election. 

  
 -4-

 3.3 Powers of the Board. In addition to any other powers set forth in the Plan
and subject to the provisions of the Plan, the Board shall have the full and final power and authority, in its discretion: 

(a) to determine the persons to whom, and the time or times at which, Options shall be granted and the number of shares of Stock to be
subject to each Option; 
 (b) to designate Options as Incentive Stock Options or Nonstatutory Stock Options; 

(c) to determine the Fair Market Value of shares of Stock or other property; 

(d) to determine the terms, conditions and restrictions applicable to each Option (which need not be identical) and any shares acquired
upon the exercise thereof, including, without limitation, (i) the exercise price of the Option, (ii) the method of payment for shares purchased upon the exercise of the Option, (iii) the method for satisfaction of any tax withholding
obligation arising in connection with the Option or such shares, including by the withholding or delivery of shares of stock, (iv) the timing, terms and conditions of the exercisability of the Option or the vesting of any shares acquired upon
the exercise thereof, (v) the time of the expiration of the Option, (vi) the effect of the Optionee’s termination of Service with the Participating Company Group on any of the foregoing, and (vii) all other terms, conditions and
restrictions applicable to the Option or such shares not inconsistent with the terms of the Plan; 
 (e) to approve one or more
forms of Option Agreement; 
 (f) to amend, modify, extend, cancel or renew any Option or to waive any restrictions or
conditions applicable to any Option or any shares acquired upon the exercise thereof; 
 (g) to accelerate, continue, extend or
defer the exercisability of any Option or the vesting of any shares acquired upon the exercise thereof, including with respect to the period following an Optionee’s termination of Service with the Participating Company Group; 

(h) to prescribe, amend or rescind rules, guidelines and policies relating to the Plan, or to adopt supplements to, or alternative
versions of, the Plan, including, without limitation, as the Board deems necessary or desirable to comply with the laws of, or to accommodate the tax policy or custom of, foreign jurisdictions whose citizens may be granted Options; and 

(i) to correct any defect, supply any omission or reconcile any inconsistency in the Plan or any Option Agreement and to make all other
determinations and take such other actions with respect to the Plan or any Option as the Board may deem advisable to the extent not inconsistent with the provisions of the Plan or applicable law. 

3.4 Administration with Respect to Insiders. With respect to participation by Insiders in the Plan, at any time that any
class of equity security of the Company is registered pursuant to Section 12 of the Exchange Act, the Plan shall be administered in compliance with the requirements, if any, of Rule 16b-3. 

  
 -5-

 3.5 Indemnification. In addition to such other rights of indemnification as
they may have as members of the Board or officers or employees of the Participating Company Group, members of the Board and any officers or employees of the Participating Company Group to whom authority to act for the Board or the Company is
delegated shall be indemnified by the Company against all reasonable expenses, including attorneys’ fees, actually and necessarily incurred in connection with the defense of any action, suit or proceeding, or in connection with any appeal
therein, to which they or any of them may be a party by reason of any action taken or failure to act under or in connection with the Plan, or any right granted hereunder, and against all amounts paid by them in settlement thereof (provided such
settlement is approved by independent legal counsel selected by the Company) or paid by them in satisfaction of a judgment in any such action, suit or proceeding, except in relation to matters as to which it shall be adjudged in such action, suit or
proceeding that such person is liable for gross negligence, bad faith or intentional misconduct in duties; provided, however, that within sixty (60) days after the institution of such action, suit or proceeding, such person shall offer to the
Company, in writing, the opportunity at its own expense to handle and defend the same. 
  

	 	4.	SHARES SUBJECT TO PLAN. 

4.1 Maximum Number of Shares Issuable. Subject to adjustment as provided in Section 4.2, the maximum aggregate number
of shares of Stock that may be issued under the Plan shall be 3,267,136 and shall consist of authorized but unissued or reacquired shares of Stock or any combination thereof. If an outstanding Option for any reason expires or is terminated or
canceled or if shares of Stock are acquired upon the exercise of an Option subject to a Company repurchase option and are repurchased by the Company at the Optionee’s exercise price, the shares of Stock allocable to the unexercised portion of
such Option or such repurchased shares of Stock shall again be available for issuance under the Plan. However, except as adjusted pursuant to Section 4.2, in no event shall more than 3,267,136 shares of Stock be available for issuance
pursuant to the exercise of Incentive Stock Options (the “ISO Share Issuance Limit”). Notwithstanding the foregoing, at any such time as the offer and sale of securities pursuant to the Plan is subject to compliance
with Section 260.140.45 of Title 10 of the California Code of Regulations (“Section 260.140.45”), the total number of shares of Stock issuable upon the exercise of all outstanding Options (together with options
outstanding under any other stock option plan of the Company) and the total number of shares provided for under any stock bonus or similar plan of the Company shall not exceed thirty percent (30%) (or such other higher percentage limitation as
may be approved by the shareholders of the Company pursuant to Section 260.140.45) of the then outstanding shares of the Company as calculated in accordance with the conditions and exclusions of Section 260.140.45. 

4.2 Adjustments for Changes in Capital Structure. In the event of any stock dividend, stock split, reverse stock split,
recapitalization, combination, reclassification or similar change in the capital structure of the Company, appropriate adjustments shall be made in the number and class of shares subject to the Plan and to any outstanding Options, in the ISO Share
Issuance Limit set forth in Section 4.1, and in the exercise price per share of any outstanding Options. If a majority of the shares that are of the same class as the shares that are subject to outstanding Options are exchanged for,
converted into, or otherwise become (whether or not pursuant to an Ownership Change Event, as defined in Section 8.1) shares of another corporation (the “New Shares”), the

  
 -6-

 
Board may unilaterally amend the outstanding Options to provide that such Options are exercisable for New Shares. In the event of any such amendment, the number of shares subject to, and
the exercise price per share of, the outstanding Options shall be adjusted in a fair and equitable manner as determined by the Board, in its discretion. Notwithstanding the foregoing, any fractional share resulting from an adjustment pursuant
to this Section 4.2 shall be rounded down to the nearest whole number, and in no event may the exercise price of any Option be decreased to an amount less than the par value, if any, of the stock subject to the Option. The adjustments
determined by the Board pursuant to this Section 4.2 shall be final, binding and conclusive. 
  

	 	5.	ELIGIBILITY AND OPTION LIMITATIONS. 

5.1 Persons Eligible for Options. Options may be granted only to Employees, Consultants, and Directors. For purposes
of the foregoing sentence, “Employees,” “Consultants” and “Directors” shall include prospective Employees, prospective Consultants and prospective Directors to whom Options are granted in connection with written offers
of an employment or other service relationship with the Participating Company Group. Eligible persons may be granted more than one (1) Option. However, eligibility in accordance with this Section shall not entitle any person to be
granted an Option, or, having been granted an Option, to be granted an additional Option. 
 5.2 Option Grant
Restrictions. Any person who is not an Employee on the effective date of the grant of an Option to such person may be granted only a Nonstatutory Stock Option. An Incentive Stock Option granted to a prospective Employee upon the
condition that such person become an Employee shall be deemed granted effective on the date such person commences Service with a Participating Company, with an exercise price determined as of such date in accordance with Section 6.1.

 5.3 Fair Market Value Limitation. To the extent that the aggregate Fair Market Value of shares that become
exercisable by an Optionee for the first time during any calendar year under an Incentive Stock Option (together with all Incentive Stock Options granted to such Optionee under all stock option plans of the Participating Company Group, including the
Plan) exceeds One Hundred Thousand Dollars ($100,000), then the portion of such options that exceeds such amount will be treated as Nonstatutory Stock Options. For purposes of this Section 5.3, options designated as Incentive Stock
Options shall be taken into account in the order in which they were granted, and the Fair Market Value of stock shall be 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 5.3, such different limitation shall be deemed incorporated herein effective as of the date and with respect to such Options as required or permitted by such amendment to the Code.
If an 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 5.3, the Optionee may designate which portion of such Option the Optionee is
exercising. In the absence of such designation, the Optionee 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. 

  
 -7-

	 	6.	TERMS AND CONDITIONS OF OPTIONS.

 Options shall be evidenced by Option Agreements specifying the number of shares of Stock covered thereby, in
such form as the Board shall from time to time establish. No Option or purported Option shall be a valid and binding obligation of the Company unless evidenced by a fully executed Option Agreement. Option Agreements may incorporate all
or any of the terms of the Plan by reference and shall comply with and be subject to the following terms and conditions: 
 6.1
Exercise Price. The exercise price for each Option shall be established in the discretion of the Board; provided, however, that (a) the exercise price per share for an Incentive Stock Option shall be not less than the Fair Market
Value of a share of Stock on the effective date of grant of the Option, (b) the exercise price per share for a Nonstatutory Stock Option shall be not less than eighty-five percent (85%) of the Fair Market Value of a share of Stock on the
effective date of grant of the Option, and (c) no Option granted to a Ten Percent Owner Optionee shall have an exercise price per share less than one hundred ten percent (110%) of the Fair Market Value of a share of Stock on the effective
date of grant of the Option. Notwithstanding the foregoing, an Option (whether an Incentive Stock Option or a Nonstatutory Stock Option) may be granted with an exercise price lower than the minimum exercise price set forth above if such
Option is granted pursuant to an assumption or substitution for another option in a manner qualifying under the provisions of Section 424(a) of the Code. 
 6.2 Exercisability and Term of Options. Options shall be exercisable at such time or times, or upon such event or events, and subject to such terms, conditions, performance criteria and
restrictions as shall be determined by the Board and set forth in the Option Agreement evidencing such Option; provided, however, that (a) no Option shall be exercisable after the expiration of ten (10) years after the effective date of
grant of such Option, (b) no Incentive Stock Option granted to a Ten Percent Owner Optionee shall be exercisable after the expiration of five (5) years after the effective date of grant of such Option, and (c) no Option granted to a
prospective Employee, prospective Consultant or prospective Director may become exercisable prior to the date on which such person commences Service with a Participating Company. 

6.3 Payment of Exercise Price. 
 (a) Forms of Consideration Authorized. Except as otherwise provided below, payment of the exercise price for the number of shares of Stock being purchased pursuant to any Option shall
be made (i) in cash, by check or cash equivalent, (ii) by tender to the Company, or attestation to the ownership, of shares of Stock owned by the Optionee having a Fair Market Value not less than the exercise price, (iii) by delivery
of a properly executed notice together with irrevocable instructions to a broker providing for the assignment to the Company of the proceeds of a sale or loan with respect to some or all of the shares being acquired upon the exercise of the Option
(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) (a “Cashless Exercise”),
(iv) provided that the Optionee is an Employee (unless otherwise not prohibited by law, including, without limitation, any regulation promulgated by the Board of Governors of the Federal Reserve System) and in the Company’s sole discretion
at the time the Option is exercised, by delivery of the Optionee’s promissory note in a form approved by the 

  
 -8-

 
Company for the aggregate exercise price, provided that, if the Company is incorporated in the State of Delaware, the Optionee shall pay in cash that portion of the aggregate exercise price not
less than the par value of the shares being acquired, (v) by such other consideration as may be approved by the Board from time to time to the extent permitted by applicable law, or (vi) by any combination thereof. The Board may at
any time or from time to time, by approval of or by amendment to the standard forms of Option Agreement described in Section 7, or by other means, grant Options that do not permit all of the foregoing forms of consideration to be used in
payment of the exercise price or that otherwise restrict one or more forms of consideration. 
 (b) Limitations on Forms
of Consideration. 
 (i) Tender of Stock. Notwithstanding the foregoing, an Option may not be exercised
by tender to the Company, or attestation to the ownership, of shares of Stock to the extent such tender or attestation would constitute a violation of the provisions of any law, regulation or agreement restricting the redemption of the
Company’s stock. Unless otherwise provided by the Board, an 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 Optionee for more than
six (6) months (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. 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 procedures for the exercise of Options by means of a Cashless Exercise. 
 (iii) Payment by Promissory Note.
No promissory note shall be permitted if the exercise of an Option using a promissory note would be a violation of any law. Any permitted promissory note shall be on such terms as the Board shall determine. The Board shall have the
authority to permit or require the Optionee to secure any promissory note used to exercise an Option with the shares of Stock acquired upon the exercise of the Option or with other collateral acceptable to the Company. Unless otherwise
provided by the Board, if the Company at any time is subject to the regulations promulgated by the Board of Governors of the Federal Reserve System or any other governmental entity affecting the extension of credit in connection with the
Company’s securities, any promissory note shall comply with such applicable regulations, and the Optionee shall pay the unpaid principal and accrued interest, if any, to the extent necessary to comply with such applicable regulations.

 6.4 Tax Withholding. The Company shall have the right, but not the obligation, to deduct from the shares of
Stock issuable upon the exercise of an Option, or to accept from the Optionee the tender of, a number of whole shares of Stock having a Fair Market Value, as determined by the Company, equal to all or any part of the federal, state, local and
foreign taxes, if any, required by law to be withheld by the Participating Company Group with respect to such Option or the shares acquired upon the exercise thereof. Alternatively or in addition, in its discretion, the Company shall have the
right to require the Optionee, through payroll withholding, cash payment or otherwise, including by means of a Cashless Exercise, to make adequate provision for any such tax withholding obligations of the Participating Company Group arising in
connection with the Option or the shares acquired upon the exercise thereof. The Fair Market Value of any shares of Stock 

  
 -9-

 
withheld or tendered to satisfy any such tax withholding obligations shall not exceed the amount determined by the applicable minimum statutory withholding rates. The Company shall have no
obligation to deliver shares of Stock or to release shares of Stock from an escrow established pursuant to the Option Agreement until the Participating Company Group’s tax withholding obligations have been satisfied by the Optionee. 

6.5 Repurchase Rights. Shares issued under the Plan may be subject to a right of first refusal, one or more repurchase
options, or other conditions and restrictions as determined by the Board in its discretion at the time the Option is granted. The Company shall have the right to assign at any time any repurchase right it may have, whether or not such right
is then exercisable, to one or more persons as may be selected by the Company. Upon request by the Company, each Optionee shall execute any agreement evidencing such transfer restrictions prior to the receipt of shares of Stock hereunder and
shall promptly present to the Company any and all certificates representing shares of Stock acquired hereunder for the placement on such certificates of appropriate legends evidencing any such transfer restrictions. 

6.6 Effect of Termination of Service. 
 (a) Option Exercisability. Subject to earlier termination of the Option as otherwise provided herein and unless otherwise provided by the Board in the grant of an Option and set forth
in the Option Agreement, an Option shall be exercisable after an Optionee’s termination of Service only during the applicable time period determined in accordance with this Section 6.6 and thereafter shall terminate: 

(i) Disability. If the Optionee’s Service terminates because of the Disability of the Optionee, the Option, to the
extent unexercised and exercisable on the date on which the Optionee’s Service terminated, may be exercised by the Optionee (or the Optionee’s guardian or legal representative) at any time prior to the expiration of twelve (12) months
(or such longer period of time as determined by the Board, in its discretion) after the date on which the Optionee’s Service terminated, but in any event no later than the date of expiration of the Option’s term as set forth in the Option
Agreement evidencing such Option (the “Option Expiration Date”). 
 (ii) Death. If the
Optionee’s Service terminates because of the death of the Optionee, the Option, to the extent unexercised and exercisable on the date on which the Optionee’s Service terminated, may be exercised by the Optionee’s legal representative
or other person who acquired the right to exercise the Option by reason of the Optionee’s death at any time prior to the expiration of twelve (12) months (or such longer period of time as determined by the Board, in its discretion) after
the date on which the Optionee’s Service terminated, but in any event no later than the Option Expiration Date. The Optionee’s Service shall be deemed to have terminated on account of death if the Optionee dies within three
(3) months (or such longer period of time as determined by the Board, in its discretion) after the Optionee’s termination of Service. 
 (iii) Other Termination of Service. If the Optionee’s Service terminates for any reason, except Disability or death, the Option, to the extent unexercised and exercisable by the
Optionee on the date on which the Optionee’s Service terminated, may be exercised by the Optionee at any time prior to the expiration of three (3) months (or such longer period of time as determined by the Board, in its discretion) after
the date on which the Optionee’s Service terminated, but in any event no later than the Option Expiration Date. 

  
 -10-

 (b) Extension if Exercise Prevented by Law. Notwithstanding the
foregoing, if the exercise of an Option within the applicable time periods set forth in Section 6.6(a) is prevented by the provisions of Section 10 below, the Option shall remain exercisable until three (3) months (or such longer
period of time as determined by the Board, in its discretion) after the date the Optionee is notified by the Company that the Option is exercisable, but in any event no later than the Option Expiration Date. 

(c) Extension if Optionee Subject to Section 16(b). Notwithstanding the foregoing, if a
sale within the applicable time periods set forth in Section 6.6(a) of shares acquired upon the exercise of the Option would subject the Optionee to suit under Section 16(b) of the Exchange Act, the Option shall remain exercisable until
the earliest to occur of (i) the tenth (10th) day following the date on which a sale of such shares by the Optionee would no longer be subject to such suit, (ii) the one hundred and ninetieth (190th) day after the Optionee’s
termination of Service, or (iii) the Option Expiration Date. 
 6.7 Transferability of Options. During the
lifetime of the Optionee, an Option shall be exercisable only by the Optionee or the Optionee’s guardian or legal representative. No Option shall be assignable or transferable by the Optionee, except by will or by the laws of descent and
distribution. Notwithstanding the foregoing, to the extent permitted by the Board, in its discretion, and set forth in the Option Agreement evidencing such Option, a Nonstatutory Stock Option shall be assignable or transferable subject to the
applicable limitations, if any, described in Section 260.140.41 of Title 10 of the California Code of Regulations, Rule 701 under the Securities Act, and the General Instructions to Form S-8 Registration Statement under the Securities Act.

  

	 	7.	STANDARD FORMS OF OPTION AGREEMENT.

 7.1 Option Agreement. Unless otherwise provided by the Board at the time the Option is granted, an
Option shall comply with and be subject to the terms and conditions set forth in the form of Option Agreement approved by the Board concurrently with its adoption of the Plan and as amended from time to time. 

7.2 Authority to Vary Terms. The Board shall have the authority from time to time to vary the terms of any standard form of
Option Agreement described in this Section 7 either in connection with the grant or amendment of an individual Option or in connection with the authorization of a new standard form or forms; provided, however, that the terms and conditions of
any such new, revised or amended standard form or forms of Option Agreement are not inconsistent with the terms of the Plan. 

7.3 Default Vesting Terms. Unless otherwise provided by the Board at the time an Option is granted, the right of an
Optionee to have any Shares subject to such Option become “Vested Shares” shall accrue at a rate of at least 20% per year over 5 years from the date that the Option is granted, subject to the Optionee’s continuing to provide
Service to the Company. 

  
 -11-

	 	8.	CHANGE IN CONTROL. 

8.1 Definitions. 
 (a) An “Ownership Change Event” shall be deemed to have occurred if any of the following occurs with respect to the Company: (i) the direct or indirect sale or exchange in a
single or series of related transactions by the shareholders of the Company of more than fifty percent (50%) of the voting stock of the Company; (ii) a merger or consolidation in which the Company is a party; (iii) the sale, exchange,
or transfer of all or substantially all of the assets of the Company; or (iv) a liquidation or dissolution of the Company. 
 (b) A “Change in Control” shall mean an Ownership Change Event or a series of related Ownership Change Events (collectively, a “Transaction”) wherein the
shareholders of the Company immediately before the Transaction do not retain immediately after the Transaction, in substantially the same proportions as their ownership of shares of the Company’s voting stock immediately before the Transaction,
direct or indirect beneficial ownership of more than fifty percent (50%) of the total combined voting power of the outstanding voting securities of the Company or, in the case of a Transaction described in Section 8.1(a)(iii), the
corporation or other business entity to which the assets of the Company were transferred (the “Transferee”), as the case may be. For purposes of the preceding sentence, indirect beneficial ownership shall include,
without limitation, an interest resulting from ownership of the voting securities of one or more corporations or other business entities that own the Company or the Transferee, as the case may be, either directly or through one or more subsidiary
corporations or other business entities. The Board shall have the right to determine whether multiple sales or exchanges of the voting securities of the Company or multiple Ownership Change Events are related, and its determination shall be
final, binding and conclusive. 
 8.2 Effect of Change in Control on Options. In the event of a Change in Control,
the surviving, continuing, successor, or purchasing corporation or other business entity or parent thereof, as the case may be (the “Acquiring Corporation”), may, without the consent of the Optionee, either assume the
Company’s rights and obligations under outstanding Options or substitute for outstanding Options substantially equivalent options for the Acquiring Corporation’s stock. Any Options that are neither assumed nor substituted for by the
Acquiring Corporation in connection with the Change in Control nor exercised as of the date of the Change in Control shall terminate and cease to be outstanding effective as of the date of the Change in Control. Notwithstanding the foregoing,
shares acquired upon exercise of an 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 the Option Agreement
evidencing such Option except as otherwise provided in such Option Agreement. 
  

	 	9.	PROVISION OF INFORMATION. 

At least annually, copies of the Company’s balance sheet and income statement for the just completed fiscal year shall be made
available to each Optionee and purchaser of shares of Stock upon the exercise of an Option. The Company shall not be required to provide such information to key employees whose duties in connection with the Company assure them access to
equivalent information. Furthermore, the Company shall deliver to each Optionee such disclosures as are required in accordance with Rule 701 under the Securities Act. 

  
 -12-

	 	10.	COMPLIANCE WITH SECURITIES LAW. 

The grant of Options and the issuance of shares of Stock upon exercise of Options shall be subject to compliance with all applicable
requirements of federal, state and foreign law with respect to such securities. Options 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 laws or regulations or the requirements of any stock exchange or market system upon which the Stock may then be listed. In addition, no Option may be exercised unless (a) 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 (b) 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 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 hereunder 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 any Option, the Company may require the Optionee 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. 
  

	 	11.	TERMINATION OR AMENDMENT OF PLAN.

 The Board may terminate or amend the Plan at any time. However, subject to changes in applicable law,
regulations or rules that would permit otherwise, without the approval of the Company’s shareholders, there shall be (a) no increase in the maximum aggregate number of shares of Stock that may be issued under the Plan (except by operation
of the provisions of Section 4.2), (b) no change in the class of persons eligible to receive Incentive Stock Options, and (c) no other amendment of the Plan that would require approval of the Company’s shareholders under any
applicable law, regulation or rule. No termination or amendment of the Plan shall affect any then outstanding Option unless expressly provided by the Board. In any event, no termination or amendment of the Plan may adversely affect any
then outstanding Option without the consent of the Optionee, unless such termination or amendment is required to enable an Option designated as an Incentive Stock Option to qualify as an Incentive Stock Option or is necessary to comply with any
applicable law, regulation or rule. 
  

	 	12.	SHAREHOLDER APPROVAL. 

The Plan or any increase in the maximum aggregate number of shares of Stock issuable thereunder as provided in Section 4.1 (the
“Authorized Shares”) shall be approved by the shareholders of the Company within twelve (12) months of the date of adoption thereof by the Board. Options granted prior to shareholder approval of the Plan or in
excess of the Authorized Shares previously approved by the shareholders shall become exercisable no earlier than the date of shareholder approval of the Plan or such increase in the Authorized Shares, as the case may be. 

  
 -13-

 NOTICE OF GRANT OF STOCK OPTION 

(Standard Vesting Options) 
 To [Optionee]: 
 This constitutes notice (this “Notice”) under the Vital
Therapies, Inc. 2012 Stock Option Plan (the “Plan”) that you have been granted the following options, subject to the terms and conditions set forth herein and in the Plan. All capitalized terms shall have the meaning ascribed to them in
the Plan or in the attached Vital Therapies, Inc. Stock Option Agreement (Standard Vesting Options) (the “Agreement”). 
  

			
	Option Grant Number:	  	  

		
	Name of Optionee:	  	  

		
	Date of Option Grant:	  	  

		
	Exercise Price Per Share:	  	  

		
	Total Number of Shares of Common Stock (the “Option Shares”) For Which Option is Granted:	  	  

		
	Total Exercise Price for Option Shares Granted:	  	  

		
	Type of Stock Option:	  	         Incentive Stock Option
		  	         Nonstatutory Stock Option
		
	Option Expiration Date:	  	The date that is ten (10) years after the Date of the Option Grant.
		
	Vesting Commencement Date:	  	  

		
	Vesting Schedule:	  	Twenty-five percent (25%) of the Shares subject to the Option shall become fully vested and exercisable on the first anniversary of the Vesting Commencement Date (the “Initial
Vesting Date”) and an additional one forty-eighth (1/48th) of the Shares subject to the Option shall become fully vested and exercisable on the first day of each full month thereafter until all the Shares are fully vested and exercisable, subject to the
Optionee’s continuing to provide Service to the Company

  
 1 

			
		  	on such dates. Any Shares that have become, as of a given date, fully vested and exercisable in accordance with the above provisions or in accordance with the Option Agreement shall
be referred to as “Vested Shares” as of such date.
		
	Termination Period:	  	This Option shall be exercisable until the
90th day after the Optionee ceases to provide Service to
the Company. Upon the Optionee’s death or Disability, this Option may be exercised for such longer period as provided in the Plan. Notwithstanding the above, in no event may the Optionee exercise this Option after the Option Expiration Date as
provided above.

  

							
		 		 	Very Truly Yours,	 	
				
		 		 	  
	 	
		 		 	[Signature of President of Company]	 	

 ACKNOWLEDGEMENT/ACCEPTANCE/AGREEMENT OF OPTIONEE 

By signing this Notice, the Optionee: (a) represents that the Optionee has received copies of, and has read and is familiar with the
terms and conditions of, the Notice, the Plan and the attached Option Agreement; (b) accepts the Option subject to all of the terms and conditions of the Notice, the Plan and the Option Agreement; (c) agrees to become subject to and bound
by the terms and conditions set forth in the Option Agreement; and (d) agrees to accept as binding, conclusive and final all decisions or interpretations of the Board upon any questions arising under the Notice, the Plan or the Option
Agreement. 
  

					
	Dated:             ,         	 		 	  

		 		 	[Signature of Optionee]
		 		 	  

		 		 	  

		 		 	[Address of Optionee]

  
 2 

 THE SECURITIES THAT 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 THAT 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. 
 VITAL THERAPIES, INC. 
 STOCK OPTION AGREEMENT 
 (Standard Vesting Options) 

Vital Therapies, Inc. has granted to the individual (the “Optionee”) named in the Notice of Grant of Stock
Option (the “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 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 Vital Therapies, Inc. 2012 Stock Option Plan (the
“Plan”), as amended to the Date of Option Grant, the provisions of which are incorporated herein by reference. By signing the Notice, the Optionee: (a) represents that the Optionee has received copies of, and has read
and is familiar with the terms and conditions of, the Notice, the Plan and this Option Agreement, (b) accepts the Option subject to all of the terms and conditions of the Notice, the Plan and this Option Agreement, and (c) agrees to accept
as binding, conclusive and final all decisions or interpretations of the Board upon any questions arising under the Notice, the Plan or this Option Agreement. 
  

	 	1.	DEFINITIONS AND CONSTRUCTION. 

1.1 Definitions. Unless otherwise defined herein, capitalized terms shall have the meanings assigned to such terms in the 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. 

  
 1 

	 	2.	TAX CONSEQUENCES. 

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

(a) Incentive Stock Option. If the 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 Optionee should consult with the Optionee’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 OPTIONEE: 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 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 ISO Fair Market Value Limitation. If the Notice designates this Option as an Incentive Stock Option, then to the extent
that the aggregate Fair Market Value of shares that become exercisable for the first time during any calendar year under the Option (together with all Incentive Stock Options granted to the Optionee under all stock option plans of the Participating
Company Group, including the Plan) exceeds One Hundred Thousand Dollars ($100,000), then the portion of such options that exceeds such amount will be treated as Nonstatutory Stock Options. For purposes of this Section 2.2, 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 2.2, 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 2.2, the Optionee may designate which portion of such Option the Optionee is exercising. In the absence of such designation,
the Optionee 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 OPTIONEE: 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.) 

  
 2 

	 	3.	ADMINISTRATION. 

 All questions of interpretation concerning this Option Agreement shall be determined by the Board. All determinations by the Board shall be final and binding 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 Initial Vesting Date
and prior to the termination of the Option (as provided in Section 6) in an amount not to exceed the number of Vested Shares less the number of shares previously acquired upon exercise of the Option, subject to the Company’s repurchase
rights set forth in Section 11. In no event shall the Option be exercisable for more shares than the Number of Option Shares. 
 4.2 Method of Exercise. Exercise of the Option shall be by written notice to the Company, which notice must state the 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 Optionee’s investment intent with respect to such shares as may be required pursuant to the provisions of this Option Agreement. The written notice must be
signed by the Optionee and must be 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 Chief Financial Officer of the Company,
or other authorized representative of the Participating Company Group, prior to the termination of the Option as set forth in Section 6, accompanied by full payment of the aggregate Exercise Price for the number of shares of Stock being
purchased. The Option shall be deemed to be exercised upon receipt by the Company of such written notice and the aggregate Exercise Price. 
 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 cash equivalent, (ii) by
tender to the Company, or attestation to the ownership, of whole shares of Stock owned by the Optionee having a Fair Market Value not less than the aggregate Exercise Price, (iii) by means of a Cashless Exercise, as defined in
Section 4.3(b)(ii), or (iv) by any combination of the foregoing. 
 (b) Limitations on Forms of
Consideration. 
 (i) Tender of Stock. Notwithstanding the foregoing, the Option may not be exercised by tender
to the Company, or attestation to the ownership, of shares of Stock to the extent such tender or attestation would constitute a violation of the provisions of any law, regulation or agreement restricting the redemption of the Company’s stock.
The Option may not be 

  
 3 

 
exercised by tender to the Company, or attestation to the ownership, of shares of Stock unless such shares either have been owned by the Optionee for more than six (6) months (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” means the delivery of a properly executed 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 some or all of the shares of Stock acquired upon the exercise of the Option
pursuant to a program or procedure approved by the Company (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).
The Company reserves, at any and all times, the right, in the Company’s sole and absolute discretion, to decline to approve or terminate any such program or procedure. 
 4.4 Tax Withholding. At the time the Option is exercised, in whole or in part, or at any time thereafter as requested by the Company, the Optionee hereby authorizes withholding from payroll and any
other amounts payable to the Optionee, and otherwise agrees to make adequate provision for (including by means of a Cashless Exercise to the extent permitted by the Company), any sums required to satisfy the federal, state, local and foreign tax
withholding obligations of the Participating Company Group, if any, which arise in connection with the Option, including, without limitation, obligations arising upon (i) the exercise, in whole or in part, of the Option, (ii) the transfer,
in whole or in part, of any shares acquired upon exercise of the Option, (iii) the operation of any law or regulation providing for the imputation of interest, or (iv) the lapsing of any restriction with respect to any shares acquired upon
exercise of the Option. The Option is not exercisable unless the tax withholding obligations of the Participating Company Group are satisfied. Accordingly, 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 Optionee. 
 4.5 Certificate Registration.
Except in the event the Exercise Price is paid by means of a Cashless Exercise, the certificate for the shares as to which the Option is exercised shall be registered in the name of the Optionee, or, if applicable, in the names of the heirs of the
Optionee. 
 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 laws 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 OPTIONEE IS CAUTIONED THAT THE OPTION
MAY NOT BE EXERCISED UNLESS THE FOREGOING 

  
 4 

 
CONDITIONS ARE SATISFIED. ACCORDINGLY, THE OPTIONEE 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 Optionee 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.

 The Option may be exercised during the lifetime of the Optionee only by the Optionee or the Optionee’s
guardian or legal representative and may not be assigned or transferred in any manner except by will or by the laws of descent and distribution. Following the death of the Optionee, the Option, to the extent provided in Section 7, may be
exercised by the Optionee’s legal representative or by any person empowered to do so under the deceased Optionee’s will or under the then applicable laws of descent and distribution. 

 

	 	6.	TERMINATION OF THE OPTION.

 The Option shall terminate and may no longer be exercised after the first to occur of (a) the Option
Expiration Date, (b) the last date for exercising the Option following termination of the Optionee’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. 
 (a) Disability. If the Optionee’s Service terminates because of the Disability of the Optionee, the Option, to the extent unexercised and exercisable on the date on which the
Optionee’s Service terminated, may be exercised by the Optionee (or the Optionee’s guardian or legal representative) at any time prior to the expiration of twelve (12) months after the date on which the Optionee’s Service
terminated, but in any event no later than the Option Expiration Date. 
 (b) Death. If the Optionee’s
Service terminates because of the death of the Optionee, the Option, to the extent unexercised and exercisable on the date on which the Optionee’s Service terminated, may be exercised by the Optionee’s legal representative or other person
who acquired the right to exercise the Option by reason of the Optionee’s death at any time prior to the expiration of twelve (12) months after the date on which the Optionee’s Service terminated, but in

  
 5 

 
any event no later than the Option Expiration Date. The Optionee’s Service shall be deemed to have terminated on account of death if the Optionee dies within three (3) months after the
Optionee’s termination of Service. 
 (c) Other Termination of Service. If the Optionee’s Service
terminates for any reason, except Disability or death, the Option, to the extent unexercised and exercisable by the Optionee on the date on which the Optionee’s Service terminated, may be exercised by the Optionee at any time prior to the
expiration of three (3) months (or such other longer period of time as determined by the Board, in its discretion) after the date on which the Optionee’s Service terminated, but in any event no later than the Option Expiration Date.

 7.2 Extension if Exercise Prevented by Law. Notwithstanding the foregoing, 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 three (3) months after the date the Optionee is notified by the Company that the Option is
exercisable, but in any event no later than the Option Expiration Date. 
 7.3 Extension if Optionee Subject to
Section 16(b). Notwithstanding the foregoing, if a sale within the applicable time periods set forth in Section 7.1 of shares acquired upon the exercise of the Option would subject the Optionee to suit under Section 16(b) of the
Exchange Act, the Option shall remain exercisable until the earliest to occur of (i) the tenth (10th) day following the date on which a sale of such shares by the Optionee would no longer be subject to such suit, (ii) the one hundred
and ninetieth (190th) day after the Optionee’s termination of Service, or (iii) the Option Expiration Date. 
  

	 	8.	CHANGE IN CONTROL. 

8.1 Definitions. 
 (a) An “Ownership Change Event” shall be deemed to have occurred if any of the following occurs with respect to the Company: (i) the direct or indirect sale or exchange in a
single or series of related transactions by the shareholders of the Company of more than fifty percent (50%) of the voting stock of the Company; (ii) a merger or consolidation in which the Company is a party; (iii) the sale, exchange,
or transfer of all or substantially all of the assets of the Company; or (iv) a liquidation or dissolution of the Company. 
 (b) A “Change in Control” shall mean an Ownership Change Event or a series of related Ownership Change Events (collectively, a “Transaction”) wherein the
shareholders of the Company immediately before the Transaction do not retain immediately after the Transaction, in substantially the same proportions as their ownership of shares of the Company’s voting stock immediately before the Transaction,
direct or indirect beneficial ownership of more than fifty percent (50%) of the total combined voting power of the outstanding voting securities of the Company or, in the case of a Transaction described in Section 8.1(a)(iii), the
corporation or other business entity to which the assets of the Company were transferred (the “Transferee”), as the case may be. For purposes of the preceding sentence, indirect beneficial ownership shall include, without
limitation, an interest resulting from ownership of the voting securities of one or more corporations 

  
 6 

 
or other business entities that own the Company or the Transferee, as the case may be, either directly or through one or more subsidiary corporations or other business entities. The Board shall
have the right to determine whether multiple sales or exchanges of the voting securities of the Company or multiple Ownership Change Events are related, and its determination shall be final, binding and conclusive. 

8.2 Effect of Change in Control on Option. In the event of a Change in Control, the surviving, continuing, successor, or
purchasing corporation or other business entity or parent thereof, as the case may be (the “Acquiring Corporation”), may, without the consent of the Optionee, either assume the Company’s rights and obligations under the
Option or substitute for the Option a substantially equivalent option for the Acquiring Corporation’s stock. The Option shall terminate and cease to be outstanding effective as of the date of the Change in Control to the extent that the Option
is neither assumed nor substituted for by the Acquiring Corporation in connection with the Change in Control nor exercised as of the date 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. 

 

	 	9.	ADJUSTMENTS FOR CHANGES IN CAPITAL
STRUCTURE. 

 In the event of any stock dividend, stock split,
reverse stock split, recapitalization, combination, reclassification, or similar change in the capital structure of the Company, appropriate adjustments shall be made in the number, Exercise Price and class of shares of stock subject to the Option.
If a majority of the shares that are of the same class as the shares that are subject to the Option are exchanged for, converted into, or otherwise become (whether or not pursuant to an Ownership Change Event) shares of another corporation (the
“New Shares”), the Board may unilaterally amend the Option to provide that the Option is exercisable for New Shares. In the event of any such amendment, the Number of Option Shares and the Exercise Price shall be adjusted in
a fair and equitable manner, as determined by the Board, in its discretion. Notwithstanding the foregoing, any fractional share resulting from an adjustment pursuant to this Section 9 shall be rounded down to the nearest whole number, and 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. The adjustments determined by the Board pursuant to this Section 9 shall be final, binding and conclusive. 

 

	 	10.	RIGHTS AS A SHAREHOLDER, EMPLOYEE OR
CONSULTANT. 

 The Optionee shall have no rights as a
shareholder with respect to any shares covered by the Option until the date of the issuance of a certificate for 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 such certificate is issued, except as provided in Section 9. If the Optionee is
an Employee, the Optionee understands and acknowledges that, except as otherwise provided in a separate, written employment agreement between a Participating Company and the Optionee, the Optionee’s employment is “at will” and is for
no specified term. Nothing in this Option Agreement shall confer upon the Optionee any right to 

  
 7 

 
continue in the Service of a Participating Company or interfere in any way with any right of the Participating Company Group to terminate the Optionee’s Service as an Employee or Consultant,
as the case may be, at any time. 
  

	 	11.	RIGHT OF FIRST REFUSAL. 

11.1 Grant of Right of First Refusal. Except as provided in Section 11.7 below, in the event the Optionee, the Optionee’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 shares acquired upon exercise of the Option (the “Transfer
Shares”) to any person or entity, including, without limitation, any shareholder 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 11 (the “Right of First Refusal”). 
 11.2 Notice of Proposed Transfer. Prior
to any proposed transfer of the Transfer Shares, the Optionee 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 Optionee proposes to transfer any Transfer
Shares to more than one Proposed Transferee, the Optionee shall provide a separate Transfer Notice for the proposed transfer to each Proposed Transferee. The Transfer Notice shall be signed by both the Optionee and the Proposed Transferee and must
constitute a binding commitment of the Optionee and the Proposed Transferee for the transfer of the Transfer Shares to the Proposed Transferee subject only to the Right of First Refusal. 

11.3 Bona Fide Transfer. If the Company determines that the information provided by the Optionee in the Transfer Notice is
insufficient to establish the bona fide nature of a proposed voluntary transfer, the Company shall give the Optionee written notice of the Optionee’s failure to comply with the procedure described in this Section 11, and the Optionee shall
have no right to transfer the Transfer Shares without first complying with the procedure described in this Section 11. The Optionee shall not be permitted to transfer the Transfer Shares if the proposed transfer is not bona fide. 

11.4 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 Optionee otherwise agree) at the purchase price and on the terms set forth in the Transfer Notice by delivery to the Optionee 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
Optionee or issued by a person other than the Optionee with respect to a proposed transfer to the same Proposed 

  
 8 

 
Transferee. If the Company exercises the Right of First Refusal, the Company and the Optionee 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 Optionee to any Participating Company shall be treated as payment to the Optionee in cash to the extent of the unpaid principal and any accrued interest canceled.

 11.5 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 Optionee otherwise agree) within the period specified in Section 11.4 above, the Optionee 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. The Company shall have the right to demand further assurances from the Optionee 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 Optionee, shall again be subject to the Right of First Refusal and shall require compliance by the Optionee with the procedure described in this Section 11. 

11.6 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 11 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 11 are met. 
 11.7 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 11.9 below result in a termination of the Right of First Refusal. 

11.8 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. 

  
 9 

 11.9 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 Acquiring Corporation assumes the Company’s rights and obligations under
the Option or substitutes a substantially equivalent option for the Acquiring Corporation’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. 
  

	 	12.	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 Optionee is entitled by reason of the Optionee’s ownership of the shares acquired upon exercise of the Option shall be immediately subject to the Right of First Refusal with the same
force and effect as the shares subject to the Right of First Refusal immediately before such event. 
  

	 	13.	NOTICE OF SALES UPON DISQUALIFYING
DISPOSITION. 

 The Optionee shall dispose of the shares
acquired pursuant to the Option only in accordance with the provisions of this Option Agreement. In addition, if the Notice designates this Option as an Incentive Stock Option, the Optionee shall (a) promptly notify the Chief Financial
Officer of the Company if the Optionee disposes of any of the shares acquired pursuant to the Option within one (1) year after the date the Optionee exercises all or part of the Option or within two (2) years after the Date of Option Grant
and (b) provide the Company with a description of the circumstances of such disposition. Until such time as the Optionee disposes of such shares in a manner consistent with the provisions of this Option Agreement, unless otherwise expressly
authorized by the Company, the Optionee shall hold all shares acquired pursuant to the Option in the Optionee’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 Option 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 Optionee 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.	LEGENDS. 

 The Company may at any time place legends referencing 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 Optionee shall, at the request of the Company, promptly present to the Company any and all certificates representing 

  
 10 

 
shares acquired pursuant to the Option in the possession of the Optionee 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: 
 14.1 “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.” 
 14.2 “THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO A RIGHT OF
FIRST REFUSAL OPTION 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.” 
 14.3 “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 TO [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.”

  

	 	15.	LOCK-UP AGREEMENT. 

The Optionee 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 Optionee 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. The foregoing limitation shall not apply to
shares registered in the public offering under the Securities Act. 

  
 11 

	 	16.	RESTRICTIONS ON TRANSFER OF SHARES.

 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 Optionee), assigned, pledged, hypothecated or otherwise disposed of, including by operation of law, in any manner that violates any of the provisions of this Option Agreement and any such
attempted disposition shall be void. The Company shall not be required (a) to transfer on its books any shares that 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. 
  

	 	17.	MISCELLANEOUS PROVISIONS. 

17.1 Binding Effect. Subject to the restrictions on transfer set forth herein, this Option Agreement shall inure to the benefit of
and be binding upon the parties hereto and their respective heirs, executors, administrators, successors and assigns. 
 17.2
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 8.2 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 Optionee unless such termination or amendment is necessary to comply with any applicable law or government regulation or is required to enable the Option, if
designated an Incentive Stock Option in the Notice, to qualify as an Incentive Stock Option. No amendment or addition to this Option Agreement shall be effective unless in writing. 

17.3 Notices. 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 or upon deposit in the United States Post Office, by registered or certified mail, with postage and fees prepaid,
addressed to the other party at the address shown below that party’s signature or at such other address as such party may designate in writing from time to time to the other party. 

17.4 Integrated Agreement. The Notice, this Option Agreement and the Plan constitute the entire understanding and agreement of the
Optionee and the Participating Company Group with respect to the subject matter contained herein or therein and supersedes any prior agreements, understandings, restrictions, representations, or warranties among the Optionee and the Participating
Company Group with respect to such subject matter other than those as set forth or provided for herein or therein. To the extent contemplated herein or therein, the provisions of the Notice and the Option Agreement shall survive any exercise of the
Option and shall remain in full force and effect. 
 17.5 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. 

  
 12 

 17.6 Counterparts. The 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. 

  
 13 

									
	
TM 
 Incentive Stock Option
	  	 	Optionee:	  	 	  

	
TM 
 Nonstatutory Stock Option
	  				 		 	
		  				 	Date:	 	  

 STOCK OPTION EXERCISE NOTICE 

(STANDARD VESTING OPTIONS) 
  

			
	Vital Therapies, Inc.	 	
	Attention: Chief Financial Officer	 	
	  
	 	
	  
	 	

 Ladies and Gentlemen: 
 1. Option. I was granted an option (the “Option”) to purchase shares of the common stock (the “Shares”) of Vital Therapies, Inc. (the
“Company”) pursuant to the Company’s 2012 Stock Option Plan (the “Plan”), my Notice of Grant of Stock Option (the “Notice”) and my Stock Option Agreement (the
“Option Agreement”) as follows: 
  

					
	 Grant Number:
	 	 	 	 
			
	 Date of Option 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, all of which are Vested Shares in accordance with the Notice and the Option
Agreement: 
  

					
	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:
	 	 $
	 	 
		
	 Tender of Company Stock:
	 	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. Optionee 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 Option 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 Option Agreement, including the Right of First Refusal set forth therein, 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. 
 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 that 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.

 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 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. 

 

			
	 VITAL THERAPIES, INC.

		
	 By:
	 	  

		
	 Title:
	 	  

		
	 Dated:
	 	  

  
 3 

 NOTICE OF GRANT OF STOCK OPTION 

(Immediately Exercisable Options with Double Trigger Acceleration) 
 To [Optionee]: 
 This constitutes notice (this “Notice”) under the Vital
Therapies, Inc. 2012 Stock Option Plan (the “Plan”) that you have been granted the following options, subject to the terms and conditions set forth herein and in the Plan. All capitalized terms shall have the meaning ascribed to them in
the Plan or in the attached Vital Therapies, Inc. Stock Option Agreement (Immediately Exercisable Options with Double Trigger Acceleration) (the “Agreement”). 

 

					
	Option Grant Number:	  	  

		
	Name of Optionee:	  	  

			
	Date of Option Grant:	  		  	  

		
	Initial Exercise Date:	  	The later of the Date of Option Grant or the date of commencement of Service to the Company.
		
	Exercise Price Per Share:	  	  

		
	Total Number of Shares of Common Stock (the “Option Shares”)
For Which Option is Granted:	  	  

		
	Total Exercise Price for Option Shares Granted:	  	  

			
	Type of Stock Option:	  	  
	  	        Incentive Stock Option
			
		  	  
	  	        Nonstatutory Stock Option
		
	Option Expiration Date:	  	The date that is ten (10) years after the Date of the Option Grant.
		
	Vesting Commencement Date:	  	  

		
	Vesting Schedule:	  	 Twenty-five percent (25%) of the Shares subject to the Option shall become fully vested and exercisable on the first anniversary of
the Vesting Commencement
 Date and an additional one forty-eighth
 (1/48th ) of
the Shares subject to the Option
 shall become fully vested and exercisable
on

  
 1 

					
		
		  	the first day of each full month thereafter until all the Shares are fully vested and exercisable, subject to the Optionee’s continuing to provide Service to the Company on
such dates. Any Shares that have become, as of a given date, fully vested and exercisable in accordance with the above provisions or in accordance with the Option Agreement shall be referred to as “Vested Shares” as of such
date.
		
	Termination Period:	  	This Option shall be exercisable until the 90th
day after the Optionee ceases to provide Service to the Company. Upon the Optionee’s death or Disability, this Option may be exercised for such longer period as provided in the
Plan. Notwithstanding the above, in no event may the Optionee exercise this Option after the Option Expiration Date as provided above.

  

			
	Very Truly Yours,	 	
		
	  
	 	
	[Signature of President of Company]	 	

 ACKNOWLEDGEMENT/ACCEPTANCE/AGREEMENT OF OPTIONEE 

By signing this Notice, the Optionee: (a) represents that the Optionee has received copies of, and has read and is familiar with the
terms and conditions of, the Notice, the Plan and the attached Option Agreement; (b) accepts the Option subject to all of the terms and conditions of the Notice, the Plan and the Option Agreement; (c) agrees to become subject to and bound
by the terms and conditions set forth in the Option Agreement; and (d) agrees to accept as binding, conclusive and final all decisions or interpretations of the Board upon any questions arising under the Notice, the Plan or the Option
Agreement. 
  

					
	Dated: _____________, _____	 		 	  

		 		 	[Signature of Optionee]
		 		 	  

		 		 	  

		 		 	[Address of Optionee]

  
 2 

 THE SECURITIES THAT 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 THAT 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. 
 VITAL THERAPIES, INC. 
 STOCK OPTION AGREEMENT 
 (Immediately Exercisable Options with Double
Trigger Acceleration) 
 Vital Therapies, Inc. has granted to the individual (the
“Optionee”) named in the Notice of Grant of Stock Option (the “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 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 Vital Therapies, Inc. 2012 Stock Option Plan (the “Plan”), as amended to the Date of Option Grant, the provisions of
which are incorporated herein by reference. By signing the Notice, the Optionee: (a) represents that the Optionee has received copies of, and has read and is familiar with the terms and conditions of, the Notice, the Plan and this Option
Agreement, (b) accepts the Option subject to all of the terms and conditions of the Notice, the Plan and this Option Agreement, and (c) agrees to accept as binding, conclusive and final all decisions or interpretations of the Board upon
any questions arising under the Notice, the Plan or this Option Agreement. 
  

	 	1.	DEFINITIONS AND CONSTRUCTION.  

1.1 Definitions. Unless otherwise defined herein, capitalized terms shall have the meanings assigned to such terms in the 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. 

  
 1 

	 	2.	TAX CONSEQUENCES.  

 2.1 Tax Status of Option. This Option is intended to have the tax status designated in the Notice. 
 (a) Incentive Stock Option. If the 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 Optionee should consult with the Optionee’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 OPTIONEE: 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 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
ISO Fair Market Value Limitation. If the Notice designates this Option as an Incentive Stock Option, then to the extent that the aggregate Fair Market Value of shares that become exercisable for the first time during any calendar year
under the Option (together with all Incentive Stock Options granted to the Optionee under all stock option plans of the Participating Company Group, including the Plan) exceeds One Hundred Thousand Dollars ($100,000), then the portion of such
options that exceeds such amount will be treated as Nonstatutory Stock Options. For purposes of this Section 2.2, 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 2.2, 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 2.2, the Optionee may designate which portion of such Option the Optionee is exercising. In the absence of such designation, the Optionee 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 OPTIONEE: 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.) 

  
 2 

 2.3 Election Under Section 83(b) of the Code. If the Optionee exercises this
Option to purchase shares of Stock that are both nontransferable and subject to a substantial risk of forfeiture, the Optionee understands that the Optionee should consult with the Optionee’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 Optionee exercises the Option. Shares acquired upon exercise of the Option are
nontransferable and subject to a substantial risk of forfeiture if, for example, (a) they are unvested and are subject to a right of the Company to repurchase such shares at the Optionee’s original purchase price if the Optionee’s
Service terminates, (b) the Optionee is an Insider and, under certain circumstances, exercises the Option within six (6) months of the Date of Option Grant (if a class of equity security of the Company is registered under Section 12
of the Exchange Act), or (c) the Optionee is subject to a restriction on transfer to comply with “Pooling-of-Interests Accounting” rules. Failure to file an election under Section 83(b), if appropriate, may result in adverse tax
consequences to the Optionee. The Optionee acknowledges that the Optionee has been advised to consult with a tax advisor prior to the exercise of the Option regarding the tax consequences to the Optionee of the exercise of the Option. AN ELECTION
UNDER SECTION 83(b) MUST BE FILED WITHIN 30 DAYS AFTER THE DATE ON WHICH THE OPTIONEE PURCHASES SHARES. THIS TIME PERIOD CANNOT BE EXTENDED. THE OPTIONEE ACKNOWLEDGES THAT TIMELY FILING OF A SECTION 83(b) ELECTION IS THE OPTIONEE’S SOLE
RESPONSIBILITY, EVEN IF THE OPTIONEE REQUESTS THE COMPANY OR ITS REPRESENTATIVE TO FILE SUCH ELECTION ON HIS OR HER BEHALF. 
  

	 	3.	ADMINISTRATION. 

 All questions of interpretation concerning this Option Agreement shall be determined by the Board. All determinations by the Board shall be final and binding 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 that is the responsibility of or that 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.  

 (a)
In General. Except as otherwise provided herein, the Option shall be exercisable on and after the Initial Exercise Date and prior to the termination of the Option (as provided in Section 6) in an amount not to exceed the 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 Section 11 and Section 12. 

(b) ISO Exercise Limitation. If this Option is designated as an Incentive Stock Option in the Notice, then
notwithstanding the provisions of Section 4.1(a) and except as provided in Section 4.1(c), to the extent that the aggregate Fair Market Value of shares that become exercisable for the first time during the calendar year of the Initial
Exercise Date 

  
 3 

 
(when added together with all shares that become exercisable for the first time during such calendar year under other Incentive Stock Options granted to the Optionee under all stock option plans
of the Participating Company Group, including the Plan) exceeds One Hundred Thousand Dollars ($100,000) (or such other limit, if any, imposed by Section 422 of the Code), the portion of the Option that exceeds such amount shall be treated as a
Nonstatutory Stock Option. For purposes of the preceding sentence, options designated as Incentive Stock Options shall be taken into account in the order in which they were granted, and the Fair Market Value of shares of stock shall be determined as
of the time the option with respect to such shares is granted. Such limitation on exercise shall be referred to in this Option Agreement as the “ISO Exercise Limitation.” If Section 422
of the Code is amended to provide for a different limitation from that set forth in this Section 4.1(b), the ISO Exercise Limitation shall be deemed amended effective as of the date required or permitted by such amendment to the Code. The ISO
Exercise Limitation shall terminate upon the earlier of (i) the Optionee’s termination of Service, (ii) the day immediately prior to the effective date of a Change in Control in which the Option is not assumed or substituted for by
the Acquiring Corporation as provided in Section 8, or (iii) the day ten (10) days prior to the Option Expiration Date. Upon such termination of the ISO Exercise Limitation, the Option shall be deemed a Nonstatutory Stock Option to
the extent of the number of shares subject to the Option that would otherwise exceed the ISO Exercise Limitation. 
 (c)
Exception to ISO Exercise Limitation. Notwithstanding any other provision of this Option Agreement, if compliance with the ISO Exercise Limitation as set forth in Section 4.1(b) will result in the exercisability of any Vested
Shares being delayed more than thirty (30) days beyond the date such shares become Vested Shares (the “Vesting Date”), the Option shall be deemed to be two (2) options. The first option
shall be for the maximum portion of the Number of Option Shares that can comply with the ISO Exercise Limitation without causing the Option to be unexercisable in the aggregate as to Vested Shares on the Vesting Date for such shares. The second
option, which shall not be treated as an Incentive Stock Option as described in section 422(b) of the Code, shall be for the balance of the Number of Option Shares; that is, those such shares that, on the respective Vesting Date for such shares,
would be unexercisable if included in the first option and thereby made subject to the ISO Exercise Limitation. Shares treated as subject to the second option shall be exercisable on the same terms and at the same time as set forth in this Option
Agreement; provided, however, that (i) Section 4.1(b) shall not apply to the second option and (ii) each such share shall become a Vested Share on the Vesting Date such share must first be allocated to the second option pursuant to
the preceding sentence. Unless the Optionee specifically elects to the contrary in the Optionee’s written notice of exercise, the first option shall be deemed to be exercised first to the maximum possible extent and then the second option shall
be deemed to be exercised. 
 4.2 Method of Exercise. Exercise of the Option shall be by written notice to the Company,
which notice must state the 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 Optionee’s investment intent with respect to such
shares as may be required pursuant to the provisions of this Option Agreement. The written notice must be signed by the Optionee and must be 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 Chief Financial Officer of the Company, or other authorized representative of the 

  
 4 

 
Participating Company Group, prior to the termination of the Option as set forth in Section 6, accompanied by (i) full payment of the aggregate Exercise Price for the number of shares
of Stock being purchased and (ii) an executed copy, if required herein, of the then current form of escrow agreement referenced below. The Option shall be deemed to be exercised upon receipt by the Company of such written notice, the aggregate
Exercise Price, and, if required by the Company, such executed agreement. 
  

	 	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 cash equivalent, (ii) by tender to the Company, or attestation to the ownership, of whole shares of Stock owned by the Optionee having a Fair Market Value not less than the aggregate Exercise Price,
(iii) by means of a Cashless Exercise, as defined in Section 4.3(b)(ii), or (iv) by any combination of the foregoing. 
 (b) Limitations on Forms of Consideration.  
 (i) Tender of
Stock. Notwithstanding the foregoing, the Option may not be exercised by tender to the Company, or attestation to the ownership, of shares of Stock to the extent such tender or attestation would constitute a violation of the provisions of any
law, regulation or agreement restricting the redemption of the Company’s stock. 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
Optionee for more than six (6) months (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” means the delivery of a properly executed
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 some or all of the shares of Stock acquired upon the exercise
of the Option pursuant to a program or procedure approved by the Company (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). The Company reserves, at any and all times, the right, in the Company’s sole and absolute discretion, to decline to approve or terminate any such program or procedure. 

4.4 Tax Withholding. At the time the Option is exercised, in whole or in part, or at any time thereafter as requested by the
Company, the Optionee hereby authorizes withholding from payroll and any other amounts payable to the Optionee, and otherwise agrees to make adequate provision for (including by means of a Cashless Exercise to the extent permitted by the Company),
any sums required to satisfy the federal, state, local and foreign tax withholding obligations of the Participating Company Group, if any, which arise in connection with the Option, including, without limitation, obligations arising upon
(i) the exercise, in whole or in part, of the Option, (ii) the transfer, in whole or in part, of any shares acquired upon 

  
 5 

 
exercise of the Option, (iii) the operation of any law or regulation providing for the imputation of interest, or (iv) the lapsing of any restriction with respect to any shares acquired
upon exercise of the Option. The Option is not exercisable unless the tax withholding obligations of the Participating Company Group are satisfied. Accordingly, the Company shall have no obligation to deliver shares of Stock or to release shares of
Stock from an escrow established pursuant to this Option Agreement until the tax withholding obligations of the Participating Company Group have been satisfied by the Optionee. 

4.5 Certificate Registration. Except in the event the Exercise Price is paid by means of a Cashless Exercise, the certificate for
the shares as to which the Option is exercised shall be registered in the name of the Optionee, or, if applicable, in the names of the heirs of the Optionee. 
 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 laws 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 OPTIONEE IS CAUTIONED THAT THE OPTION MAY NOT BE EXERCISED UNLESS THE FOREGOING CONDITIONS ARE SATISFIED. ACCORDINGLY,
THE OPTIONEE 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 Optionee 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. 

The Option may be exercised during the lifetime of the Optionee only by the Optionee or the Optionee’s guardian or legal
representative and may not be assigned or transferred in any manner except by will or by the laws of descent and distribution. Following the death of the Optionee, the Option, to the extent provided in Section 7, may be exercised by

  
 6 

 
the Optionee’s legal representative or by any person empowered to do so under the deceased Optionee’s will or under the then applicable laws of descent and distribution. 

 

	 	6.	TERMINATION OF THE OPTION.  

The Option shall terminate and may no longer be exercised after the first to occur of (a) the Option Expiration Date, (b) the
last date for exercising the Option following termination of the Optionee’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. 

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

(b) Death. If the Optionee’s Service terminates because of the death of the Optionee, the Option, to the extent
unexercised and exercisable on the date on which the Optionee’s Service terminated, may be exercised by the Optionee’s legal representative or other person who acquired the right to exercise the Option by reason of the Optionee’s
death at any time prior to the expiration of twelve (12) months after the date on which the Optionee’s Service terminated, but in any event no later than the Option Expiration Date. The Optionee’s Service shall be deemed to have
terminated on account of death if the Optionee dies within three (3) months after the Optionee’s termination of Service. 
 (c) Termination After Change in Control. If the Optionee’s Service ceases as a result of Termination After Change in Control (as defined below), (i) the Option, to the extent
unexercised and exercisable on the date on which the Optionee’s Service terminated, may be exercised by the Optionee (or the Optionee’s guardian or legal representative) at any time prior to the expiration of six (6) months after the
date on which the Optionee’s Service terminated, but in any event no later than the Option Expiration Date, and (ii) the Option shall become immediately vested and exercisable in full as of the date on which the Optionee’s Service
terminated. 
 (d) Other Termination of Service. If the Optionee’s Service terminates for any reason, except
Disability, death or Termination After Change in Control, the Option, to the extent unexercised and exercisable by the Optionee on the date on which the Optionee’s Service terminated, may be exercised by the Optionee at any time prior to the
expiration of three (3) months (or such other longer period of time as determined by the Board, in its discretion) after the date on which the Optionee’s Service terminated, but in any event no later than the Option Expiration Date.

  
 7 

 7.2 Additional Limitations on Option Exercise. Notwithstanding the provisions of
Section 7.1, the Option may not be exercised after the Optionee’s termination of Service to the extent that the shares to be acquired upon exercise of the Option would be subject to the Unvested Share Repurchase Option as provided in
Section 11. 
 7.3 Extension if Exercise Prevented by Law. Notwithstanding the foregoing, 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 three (3) months after the date the Optionee is notified by the Company that
the Option is exercisable, but in any event no later than the Option Expiration Date. 
 7.4 Extension if Optionee Subject to
Section 16(b). Notwithstanding the foregoing, if a sale within the applicable time periods set forth in Section 7.1 of shares acquired upon the exercise of the Option would subject the Optionee to suit under Section 16(b) of the
Exchange Act, the Option shall remain exercisable until the earliest to occur of (i) the tenth (10th) day following the date on which a sale of such shares by the Optionee would no longer be subject to such suit, (ii) the one hundred
and ninetieth (190th) day after the Optionee’s termination of Service, or (iii) the Option Expiration Date. 
  

	 	7.5	Certain Definitions.  

(a) “Termination After Change in
Control” shall mean either of the following events occurring within twelve (12) months after a Change in Control: 
 (i) termination by the Participating Company Group of the Optionee’s Service with the Participating Company Group for any reason other than for Cause (as defined below); or 

(ii) the Optionee’s resignation for Good Reason (as defined below) from all capacities in which the Optionee is then rendering
Service to the Participating Company Group within a reasonable period of time following the event constituting Good Reason. 
 Notwithstanding
any provision herein to the contrary, Termination After Change in Control shall not include any termination of the Optionee’s Service with the Participating Company Group that (1) is for Cause (as defined below); (2) is a result of
the Optionee’s death or disability; (3) is a result of the Optionee’s voluntary termination of Service other than for Good Reason; or (4) occurs prior to the effectiveness of a Change in Control. 

(b) “Cause” shall mean any of the following:
(i) the Optionee’s theft, dishonesty, or falsification of any Participating Company documents or records; (ii) the Optionee’s improper use or disclosure of a Participating Company’s confidential or proprietary information;
(iii) any action by the Optionee that has a detrimental effect on a Participating Company’s reputation or business; (iv) the Optionee’s failure or inability to perform any reasonable assigned duties after written notice from a
Participating Company of, and a 

  
 8 

 
reasonable opportunity to cure, such failure or inability; (v) any material breach by the Optionee of any employment agreement between the Optionee and a Participating Company, which breach
is not cured pursuant to the terms of such agreement; or (vi) the Optionee’s conviction (including any plea of guilty or nolo contendere) of any criminal act that impairs the Optionee’s ability to perform his or her duties with a
Participating Company. 
 (c) “Good Reason” shall mean any one or
more of the following: 
 (i) without the Optionee’s express written consent, the assignment to the Optionee of any duties,
or any limitation of the Optionee’s responsibilities, substantially inconsistent with the Optionee’s positions, duties, responsibilities and status with the Participating Company Group immediately prior to the date of the Change in
Control; 
 (ii) without the Optionee’s express written consent, the relocation of the principal place of the
Optionee’s Service to a location that is more than fifty (50) miles from the Optionee’s principal place of Service immediately prior to the date of the Change in Control, or the imposition of travel requirements substantially more
demanding of the Optionee than such travel requirements existing immediately prior to the date of the Change in Control; 

(iii) any failure by the Participating Company Group to pay, or any material reduction by the Participating Company Group of,
(1) the Optionee’s base salary in effect immediately prior to the date of the Change in Control (unless reductions comparable in amount and duration are concurrently made for all other employees of the Participating Company Group with
responsibilities, organizational level and title comparable to the Optionee’s), or (2) the Optionee’s bonus compensation, if any, in effect immediately prior to the date of the Change in Control (subject to applicable performance
requirements with respect to the actual amount of bonus compensation earned by the Optionee); or 
 (iv) any failure by the
Participating Company Group to (1) continue to provide the Optionee with the opportunity to participate, on terms no less favorable than those in effect for the benefit of any employee or service provider group that customarily includes a
person holding the employment or service provider position or a comparable position with the Participating Company Group then held by the Optionee, in any benefit or compensation plans and programs, including, but not limited to, the Participating
Company Group’s life, disability, health, dental, medical, savings, profit sharing, stock purchase and retirement plans, if any, in which the Optionee was participating immediately prior to the date of the Change in Control, or their
equivalent, or (2) provide the Optionee with all other fringe benefits (or their equivalent) from time to time in effect for the benefit of any employee or service provider group that customarily includes a person holding the employment or
service provider position or a comparable position with the Participating Company Group then held by the Optionee. 
  

	 	8.	CHANGE IN CONTROL. 

 

	 	8.1	Definitions.  

  
 9 

 (a) An “Ownership Change Event” shall be deemed to
have occurred if any of the following occurs with respect to the Company: (i) the direct or indirect sale or exchange in a single or series of related transactions by the shareholders of the Company of more than fifty percent (50%) of the
voting stock of the Company; (ii) a merger or consolidation in which the Company is a party; (iii) the sale, exchange, or transfer of all or substantially all of the assets of the Company; or (iv) a liquidation or dissolution of the
Company. 
 (b) A “Change in Control” shall mean an Ownership Change Event or a series of
related Ownership Change Events (collectively, a “Transaction”) wherein the shareholders of the Company immediately before the Transaction do not retain immediately after the Transaction, in substantially the
same proportions as their ownership of shares of the Company’s voting stock immediately before the Transaction, direct or indirect beneficial ownership of more than fifty percent (50%) of the total combined voting power of the outstanding
voting securities of the Company or, in the case of a Transaction described in Section 8.1(a)(iii), the corporation or other business entity to which the assets of the Company were transferred (the
“Transferee”), as the case may be. For purposes of the preceding sentence, indirect beneficial ownership shall include, without limitation, an interest resulting from ownership of the voting securities of one or
more corporations or other business entities that own the Company or the Transferee, as the case may be, either directly or through one or more subsidiary corporations or other business entities. The Board shall have the right to determine whether
multiple sales or exchanges of the voting securities of the Company or multiple Ownership Change Events are related, and its determination shall be final, binding and conclusive. 

8.2 Effect of Change in Control on Option. In the event of a Change in Control, the surviving, continuing, successor, or
purchasing corporation or other business entity or parent thereof, as the case may be (the “Acquiring Corporation”), may, without the consent of the Optionee, either assume the Company’s rights and
obligations under the Option or substitute for the Option a substantially equivalent option for the Acquiring Corporation’s stock. In the event the Acquiring Corporation elects not to assume the Company’s rights and obligations under the
Option or substitute for the Option in connection with the Change in Control, and provided that the Optionee’s Service has not terminated prior to such date, all shares acquired upon exercise of the Option shall be Vested Shares for purposes of
Section 11 as of the date ten (10) days prior to the date of the Change in Control. Any vesting of the Option that was permissible solely by reason of this Section 8.2 shall be conditioned upon the consummation of the Change in
Control. The Option shall terminate and cease to be outstanding effective as of the date of the Change in Control to the extent that the Option is neither assumed or substituted for by the Acquiring Corporation in connection with the Change in
Control nor exercised as of the date 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. 
  

	 	9.	ADJUSTMENTS FOR CHANGES IN CAPITAL
STRUCTURE. 

  

  
 10 

 In the event of any stock dividend, stock split, reverse stock split, recapitalization,
combination, reclassification, or similar change in the capital structure of the Company, appropriate adjustments shall be made in the number, Exercise Price and class of shares of stock subject to the Option. If a majority of the shares that are of
the same class as the shares that are subject to the Option are exchanged for, converted into, or otherwise become (whether or not pursuant to an Ownership Change Event) shares of another corporation (the “New
Shares”), the Board may unilaterally amend the Option to provide that the Option is exercisable for New Shares. In the event of any such amendment, the Number of Option Shares and the Exercise Price shall be adjusted in a
fair and equitable manner, as determined by the Board, in its discretion. Notwithstanding the foregoing, any fractional share resulting from an adjustment pursuant to this Section 9 shall be rounded down to the nearest whole number, and 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. The adjustments determined by the Board pursuant to this Section 9 shall be final, binding and conclusive. 

 

	 	10.	RIGHTS AS A SHAREHOLDER, EMPLOYEE OR
CONSULTANT.  

 The Optionee shall have no rights as a shareholder with
respect to any shares covered by the Option until the date of the issuance of a certificate for 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 such certificate is issued, except as provided in Section 9. If the Optionee is an Employee, the
Optionee understands and acknowledges that, except as otherwise provided in a separate, written employment agreement between a Participating Company and the Optionee, the Optionee’s employment is “at will” and is for no specified
term. Nothing in this Option Agreement shall confer upon the Optionee 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 Optionee’s Service
as 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 Optionee’s Service with the Participating Company Group is
terminated for any reason or no reason, with or without cause, or, if the Optionee, the Optionee’s legal representative, or other holder of shares acquired upon exercise of the Option 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”). 

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 that exceed the Vested Shares determined as of such date. 

  
 11 

 11.3 Exercise of Unvested Share Repurchase Option. The Company may exercise the
Unvested Share Repurchase Option by written notice to the Optionee within sixty (60) days after (a) termination of the Optionee’s Service (or exercise of the Option, if later) 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 Optionee have extended the time for the exercise of
the Unvested Share Repurchase Option. The Unvested Share Repurchase Option must be exercised, if at all, for all of the Unvested Shares, except as the Company and the Optionee otherwise agree. 

11.4 Payment for Shares and Return of Shares to Company. The purchase price per share being repurchased by the Company shall be an
amount equal to the Optionee’s original cost per share, as adjusted pursuant to Section 9 (the “Repurchase Price”). The Company shall pay the aggregate Repurchase Price to the Optionee in cash within
thirty (30) days after the date of the written notice to the Optionee of the Company’s exercise of the Unvested Share Repurchase Option. For purposes of the foregoing, cancellation of any purchase money indebtedness of the Optionee to any
Participating Company for the shares shall be treated as payment to the Optionee 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 Optionee at the
same time as the delivery of the Repurchase Price to the Optionee. 
 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 Optionee is entitled by reason of the Optionee’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. For purposes of determining the Vested Shares
following an Ownership Change Event, credited Service shall include all Service with any corporation that 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. 
  

	 	12.	RIGHT OF FIRST REFUSAL. 

12.1 Grant of Right of First Refusal. Except as provided in Section 12.7 below, in the event the Optionee, the Optionee’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 shareholder of a Participating Company, the Company shall have the right to 

  
 12 

 
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 Optionee 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 Optionee proposes to transfer any Transfer Shares to more than one Proposed Transferee, the
Optionee shall provide a separate Transfer Notice for the proposed transfer to each Proposed Transferee. The Transfer Notice shall be signed by both the Optionee and the Proposed Transferee and must constitute a binding commitment of the Optionee
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 Optionee in the Transfer Notice is insufficient to establish the bona fide nature of a proposed voluntary
transfer, the Company shall give the Optionee written notice of the Optionee’s failure to comply with the procedure described in this Section 12, and the Optionee shall have no right to transfer the Transfer Shares without first complying
with the procedure described in this Section 12. The Optionee 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 Optionee otherwise agree) at the purchase price and on the terms set forth in the Transfer Notice by delivery to the Optionee 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 Optionee or issued by a person other than the Optionee with respect
to a proposed transfer to the same Proposed Transferee. If the Company exercises the Right of First Refusal, the Company and the Optionee 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 Optionee to any Participating Company shall be treated as payment to the Optionee in cash to the extent of the unpaid principal and any accrued interest canceled.

  
 13 

 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 Optionee otherwise agree) within the period specified in Section 12.4 above, the Optionee 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. The Company shall have the right to demand further assurances
from the Optionee 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 Optionee, shall again be subject to the Right of First Refusal and shall require compliance by the Optionee 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. 
 12.9 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 Acquiring Corporation assumes the Company’s rights and obligations under the Option or substitutes a substantially equivalent option for the Acquiring Corporation’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. 

  
 14 

 13. ESCROW.  

13.1 Establishment of Escrow. To ensure that shares subject to the Unvested Share Repurchase Option will be available for
repurchase, the Company may require the Optionee to deposit the certificate evidencing the shares that the Optionee purchases upon exercise of the Option with an agent designated by the Company under the terms and conditions of an escrow agreement
approved by the Company. If the Company does not require such deposit as a condition of exercise of the Option, the Company reserves the right at any time to require the Optionee to so deposit the certificate in escrow. Upon the occurrence of an
Ownership Change Event or a 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, any and all new, substituted
or additional securities or other property to which the Optionee is entitled by reason of the Optionee’s ownership of shares of Stock acquired upon exercise of the Option that remain, following such Ownership Change Event 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 such shares of Stock immediately before such event. The Company shall bear the expenses of the escrow. 

13.2 Delivery of Shares to Optionee. As soon as practicable after the expiration of the Unvested Share Repurchase Option, but not
more frequently than twice each calendar year, the escrow agent shall deliver to the Optionee the shares and any other property no longer subject to such restriction. 
 13.3 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 Optionee shall be given to the escrow agent, and any payment required to be given to the Optionee shall be given to the escrow agent. Within thirty (30) days after payment by the Company, the
escrow agent shall deliver the shares and any other property that the Company has purchased to the Company and shall deliver the payment received from the Company to the Optionee. 

 

	 	14.	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 Optionee is
entitled by reason of the Optionee’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. 
  

	 	15.	NOTICE OF SALES UPON DISQUALIFYING
DISPOSITION. 

 The Optionee shall dispose of the shares
acquired pursuant to the Option only in accordance with the provisions of this Option Agreement. In addition, if the Notice designates 

  
 15 

 
this Option as an Incentive Stock Option, the Optionee shall (a) promptly notify the Chief Financial Officer of the Company if the Optionee disposes of any of the shares acquired
pursuant to the Option within one (1) year after the date the Optionee exercises all or part of the Option or within two (2) years after the Date of Option Grant and (b) provide the Company with a description of the circumstances of
such disposition. Until such time as the Optionee disposes of such shares in a manner consistent with the provisions of this Option Agreement, unless otherwise expressly authorized by the Company, the Optionee shall hold all shares acquired pursuant
to the Option in the Optionee’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 Option 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 Optionee 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. 

 

	 	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 Optionee 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 Optionee 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 AN UNVESTED SHARE REPURCHASE OPTION 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 REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO A RIGHT OF FIRST REFUSAL OPTION IN FAVOR OF THE

  
 16 

 
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.” 
 16.4 “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 TO [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 Optionee 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 Optionee 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. The foregoing limitation shall not apply to
shares registered in the public offering under the Securities Act. 
  

	 	18.	RESTRICTIONS ON TRANSFER OF SHARES.  

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 Optionee), assigned, pledged, hypothecated or otherwise disposed of, including by operation of law, in any manner that 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 that 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. 

  
 17 

	 	19.	MISCELLANEOUS PROVISIONS.  

19.1 Binding Effect. Subject to the restrictions on transfer set forth herein, this Option Agreement shall inure to the benefit of
and be binding upon the parties hereto and their respective heirs, executors, administrators, successors and assigns. 
 19.2
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 8.2 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 Optionee unless such termination or amendment is necessary to comply with any applicable law or government regulation or is required to enable the Option, if
designated an Incentive Stock Option in the Notice, to qualify as an Incentive Stock Option. No amendment or addition to this Option Agreement shall be effective unless in writing. 

19.3 Notices. 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 or upon deposit in the United States Post Office, by registered or certified mail, with postage and fees prepaid,
addressed to the other party at the address shown below that party’s signature or at such other address as such party may designate in writing from time to time to the other party. 

19.4 Integrated Agreement. The Notice, this Option Agreement and the Plan constitute the entire understanding and agreement of the
Optionee and the Participating Company Group with respect to the subject matter contained herein or therein and supersedes any prior agreements, understandings, restrictions, representations, or warranties among the Optionee and the Participating
Company Group with respect to such subject matter other than those as set forth or provided for herein or therein. To the extent contemplated herein or therein, the provisions of the Notice and the Option Agreement shall survive any exercise of the
Option and shall remain in full force and effect. 
 19.5 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. 
 19.6 Counterparts. The 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 

									
	
TM 
 Incentive Stock Option
	  	 	Optionee:	  	 	  

	
TM 
 Nonstatutory Stock Option
	  				 		 	
		  				 	Date:	 	  

 STOCK OPTION EXERCISE NOTICE 

(IMMEDIATELY EXERCISABLE) 
  

			
	Vital Therapies, Inc.	 	
	Attention: Chief Financial Officer	 	
	  
	 	
	  
	 	

 Ladies and Gentlemen: 
 1. Option. I was granted an option (the “Option”) to purchase shares of the common stock (the “Shares”) of Vital
Therapies, Inc. (the “Company”) pursuant to the Company’s 2012 Stock Option Plan (the “Plan”), my Notice of Grant of Stock Option (the
“Notice”) and my Stock Option Agreement (the “Option Agreement”) as follows: 

 

					
	 Grant Number:
	 	 	 	 
			
	 Date of Option 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: 
  

					
	 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:
	 	 $
	 	 
		
	 Tender of Company Stock:
	 	Contact Plan Administrator

 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 

  
 1 

 
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. Optionee 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 Option 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 Option Agreement, including the Unvested Share Repurchase Option and the Right of First Refusal set forth therein, 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 Company’s standard Joint Escrow Instructions. 
 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 that 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. 
 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. 

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 no later than thirty (30) days after the date on which I exercise the Option. I acknowledge that I 

  
 2 

 
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. AN ELECTION UNDER SECTION 83(b) MUST BE FILED
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 IS MY SOLE RESPONSIBILITY, EVEN IF I REQUEST THE COMPANY OR ITS REPRESENTATIVES TO FILE SUCH
ELECTION ON MY BEHALF. 
 I understand that I am purchasing the Shares pursuant to the terms of the Plan, the 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.
	
	VITAL THERAPIES, INC.
		
	By:	 	  

	Title:	 	  

	Dated:	 	  

  
 3 

 NOTICE OF GRANT OF STOCK OPTION 

(Immediately Exercisable Options with Double Trigger Acceleration) 
 To [Optionee]: 
 This constitutes notice (this “Notice”) under the Vital
Therapies, Inc. 2012 Stock Option Plan (the “Plan”) that you have been granted the following options, subject to the terms and conditions set forth herein and in the Plan. All capitalized terms shall have the meaning ascribed to them in
the Plan or in the attached Vital Therapies, Inc. Stock Option Agreement (Immediately Exercisable Options with Double Trigger Acceleration) (the “Agreement”). 

 

			
	Option Grant Number:	  	  

		
	Name of Optionee:	  	  

		
	Date of Option Grant:	  	  

		
	Initial Exercise Date:	  	The later of the Date of Option Grant or the date of commencement of Service to the Company.
		
	Exercise Price Per Share:	  	  

		
	Total Number of Shares of Common Stock (the “Option Shares”)
For Which Option is Granted:	  	  
  

		
	Total Exercise Price for Option Shares Granted:	  	  

		
	Type of Stock Option:	  	         Incentive Stock Option
		  	         Nonstatutory Stock Option
		
	Option Expiration Date:	  	The date that is ten (10) years after the Date of the Option Grant.
		
	Vesting Commencement Date:	  	  

		
	Vesting Schedule:	  	Twenty-five percent (25%) of the Shares subject to the Option shall become fully vested and exercisable on the first anniversary of the Vesting Commencement Date and an additional
one forty-eighth (1/48th) of the Shares subject to the
Option shall become

  
 1 

			
		  	fully vested and exercisable on the first day of each full month thereafter until all the Shares are fully vested and exercisable, subject to the Optionee’s continuing to
provide Service to the Company on such dates. Any Shares that have become, as of a given date, fully vested and exercisable in accordance with the above provisions or in accordance with the Option Agreement shall be referred to as “Vested
Shares” as of such date.
		
	Termination Period:	  	This Option shall be exercisable until the
90th day after the Optionee ceases to provide Service to
the Company. Upon the Optionee’s death or Disability, this Option may be exercised for such longer period as provided in the Plan. Notwithstanding the above, in no event may the Optionee exercise this Option after the Option Expiration Date as
provided above.

  

							
		 		 	Very Truly Yours,	 	
				
		 		 	  
	 	
		 		 	[Signature of President of Company]	 	

 ACKNOWLEDGEMENT/ACCEPTANCE/AGREEMENT OF OPTIONEE 

By signing this Notice, the Optionee: (a) represents that the Optionee has received copies of, and has read and is familiar with the
terms and conditions of, the Notice, the Plan and the attached Option Agreement; (b) accepts the Option subject to all of the terms and conditions of the Notice, the Plan and the Option Agreement; (c) agrees to become subject to and bound
by the terms and conditions set forth in the Option Agreement; and (d) agrees to accept as binding, conclusive and final all decisions or interpretations of the Board upon any questions arising under the Notice, the Plan or the Option
Agreement. 
  

					
	Dated:             ,         	 		 	  

		 		 	[Signature of Optionee]
		 		 	  

		 		 	  

		 		 	[Address of Optionee]

  
 2 

 THE SECURITIES THAT 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 THAT 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. 
 VITAL THERAPIES, INC. 
 STOCK OPTION AGREEMENT 
 (Immediately Exercisable Options with Double
Trigger Acceleration) 
 Vital Therapies, Inc. has granted to the individual (the “Optionee”) named
in the Notice of Grant of Stock Option (the “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 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 Vital Therapies, Inc. 2012 Stock
Option Plan (the “Plan”), as amended to the Date of Option Grant, the provisions of which are incorporated herein by reference. By signing the Notice, the Optionee: (a) represents that the Optionee has received copies
of, and has read and is familiar with the terms and conditions of, the Notice, the Plan and this Option Agreement, (b) accepts the Option subject to all of the terms and conditions of the Notice, the Plan and this Option Agreement, and
(c) agrees to accept as binding, conclusive and final all decisions or interpretations of the Board upon any questions arising under the Notice, the Plan or this Option Agreement. 

 

	 	1.	DEFINITIONS AND CONSTRUCTION. 

1.1 Definitions. Unless otherwise defined herein, capitalized terms shall have the meanings assigned to such terms in the
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. 

  
 1 

	 	2.	TAX CONSEQUENCES. 

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

(a) Incentive Stock Option. If the 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 Optionee should consult with the Optionee’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 OPTIONEE: 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
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 ISO Fair Market Value Limitation. If the Notice designates this Option as an Incentive Stock Option, then to the extent
that the aggregate Fair Market Value of shares that become exercisable for the first time during any calendar year under the Option (together with all Incentive Stock Options granted to the Optionee under all stock option plans of the Participating
Company Group, including the Plan) exceeds One Hundred Thousand Dollars ($100,000), then the portion of such options that exceeds such amount will be treated as Nonstatutory Stock Options. For purposes of this Section 2.2, 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 2.2, 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 2.2, the Optionee may designate which portion of such Option the Optionee is exercising. In the absence of such designation,
the Optionee 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 OPTIONEE: 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.) 

2.3 Election Under Section 83(b) of the Code. If the Optionee exercises this Option to purchase shares of Stock that
are both nontransferable and subject to a substantial risk of forfeiture, the Optionee understands that the Optionee should consult with the Optionee’s tax 

  
 2 

 
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 Optionee exercises the Option. Shares acquired upon exercise of the Option are nontransferable and subject to a substantial risk of forfeiture if, for example, (a) they are unvested and are subject to a right of the Company to
repurchase such shares at the Optionee’s original purchase price if the Optionee’s Service terminates, (b) the Optionee is an Insider and, under certain circumstances, exercises the Option within six (6) months of the Date of
Option Grant (if a class of equity security of the Company is registered under Section 12 of the Exchange Act), or (c) the Optionee is subject to a restriction on transfer to comply with “Pooling-of-Interests Accounting” rules.
Failure to file an election under Section 83(b), if appropriate, may result in adverse tax consequences to the Optionee. The Optionee acknowledges that the Optionee has been advised to consult with a tax advisor prior to the exercise of the
Option regarding the tax consequences to the Optionee of the exercise of the Option. AN ELECTION UNDER SECTION 83(b) MUST BE FILED WITHIN 30 DAYS AFTER THE DATE ON WHICH THE OPTIONEE PURCHASES SHARES. THIS TIME PERIOD CANNOT BE EXTENDED. THE
OPTIONEE ACKNOWLEDGES THAT TIMELY FILING OF A SECTION 83(b) ELECTION IS THE OPTIONEE’S SOLE RESPONSIBILITY, EVEN IF THE OPTIONEE REQUESTS THE COMPANY OR ITS REPRESENTATIVE TO FILE SUCH ELECTION ON HIS OR HER BEHALF. 

 

	 	3.	ADMINISTRATION. 

 All questions of interpretation concerning this Option Agreement shall be determined by the Board. All determinations by the Board shall be final and binding 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 that is the responsibility of or that 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. 
 (a) In General. Except as otherwise provided herein, the Option shall be exercisable on and after the Initial Exercise Date and prior to the termination of the Option (as provided in
Section 6) in an amount not to exceed the 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 Section 11 and Section 12.

 (b) ISO Exercise Limitation. If this Option is designated as an Incentive Stock Option in the Notice,
then notwithstanding the provisions of Section 4.1(a) and except as provided in Section 4.1(c), to the extent that the aggregate Fair Market Value of shares that become exercisable for the first time during the calendar year of the
Initial Exercise Date (when added together with all shares that become exercisable for the first time during such calendar year under other Incentive Stock Options granted to the Optionee under all stock option plans of the Participating Company
Group, including the Plan) exceeds One Hundred Thousand Dollars 

  
 3 

 
($100,000) (or such other limit, if any, imposed by Section 422 of the Code), the portion of the Option that exceeds such amount shall be treated as a Nonstatutory Stock Option. For purposes
of the preceding sentence, options designated as Incentive Stock Options shall be taken into account in the order in which they were granted, and the Fair Market Value of shares of stock shall be determined as of the time the option with respect to
such shares is granted. Such limitation on exercise shall be referred to in this Option Agreement as the “ISO Exercise Limitation.” If Section 422 of the Code is amended to provide for a different limitation from that
set forth in this Section 4.1(b), the ISO Exercise Limitation shall be deemed amended effective as of the date required or permitted by such amendment to the Code. The ISO Exercise Limitation shall terminate upon the earlier of (i) the
Optionee’s termination of Service, (ii) the day immediately prior to the effective date of a Change in Control in which the Option is not assumed or substituted for by the Acquiring Corporation as provided in Section 8, or
(iii) the day ten (10) days prior to the Option Expiration Date. Upon such termination of the ISO Exercise Limitation, the Option shall be deemed a Nonstatutory Stock Option to the extent of the number of shares subject to the Option that
would otherwise exceed the ISO Exercise Limitation. 
 (c) Exception to ISO Exercise Limitation. Notwithstanding
any other provision of this Option Agreement, if compliance with the ISO Exercise Limitation as set forth in Section 4.1(b) will result in the exercisability of any Vested Shares being delayed more than thirty (30) days beyond the date
such shares become Vested Shares (the “Vesting Date”), the Option shall be deemed to be two (2) options. The first option shall be for the maximum portion of the Number of Option Shares that can comply with the ISO
Exercise Limitation without causing the Option to be unexercisable in the aggregate as to Vested Shares on the Vesting Date for such shares. The second option, which shall not be treated as an Incentive Stock Option as described in section 422(b) of
the Code, shall be for the balance of the Number of Option Shares; that is, those such shares that, on the respective Vesting Date for such shares, would be unexercisable if included in the first option and thereby made subject to the ISO Exercise
Limitation. Shares treated as subject to the second option shall be exercisable on the same terms and at the same time as set forth in this Option Agreement; provided, however, that (i) Section 4.1(b) shall not apply to the second option
and (ii) each such share shall become a Vested Share on the Vesting Date such share must first be allocated to the second option pursuant to the preceding sentence. Unless the Optionee specifically elects to the contrary in the Optionee’s
written notice of exercise, the first option shall be deemed to be exercised first to the maximum possible extent and then the second option shall be deemed to be exercised. 
 4.2 Method of Exercise. Exercise of the Option shall be by written notice to the Company, which notice must state the 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 Optionee’s investment intent with respect to such shares as may be required pursuant to the provisions of this Option Agreement. The written notice must
be signed by the Optionee and must be 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 Chief Financial Officer of the
Company, or other authorized representative of the Participating Company Group, prior to the termination of the Option as set forth in Section 6, accompanied by (i) full payment of the aggregate Exercise Price for the number of shares of
Stock being purchased and (ii) an executed copy, if required herein, of the then current form of escrow agreement referenced below. The Option shall be deemed to be exercised upon receipt by the Company of such written notice, the aggregate
Exercise Price, and, if required by the Company, such executed agreement. 

  
 4 

 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 cash equivalent, (ii) by tender to the Company, or attestation to the ownership, of whole shares of Stock owned by the Optionee
having a Fair Market Value not less than the aggregate Exercise Price, (iii) by means of a Cashless Exercise, as defined in Section 4.3(b)(ii), or (iv) by any combination of the foregoing. 

(b) Limitations on Forms of Consideration. 
 (i) Tender of Stock. Notwithstanding the foregoing, the Option may not be exercised by tender to the Company, or attestation to the ownership, of shares of Stock to the extent such tender or
attestation would constitute a violation of the provisions of any law, regulation or agreement restricting the redemption of the Company’s stock. 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 Optionee for more than six (6) months (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” means the delivery of a properly executed
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 some or all of the shares of Stock acquired upon the exercise
of the Option pursuant to a program or procedure approved by the Company (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). The Company reserves, at any and all times, the right, in the Company’s sole and absolute discretion, to decline to approve or terminate any such program or procedure. 

4.4 Tax Withholding. At the time the Option is exercised, in whole or in part, or at any time thereafter as requested by
the Company, the Optionee hereby authorizes withholding from payroll and any other amounts payable to the Optionee, and otherwise agrees to make adequate provision for (including by means of a Cashless Exercise to the extent permitted by the
Company), any sums required to satisfy the federal, state, local and foreign tax withholding obligations of the Participating Company Group, if any, which arise in connection with the Option, including, without limitation, obligations arising upon
(i) the exercise, in whole or in part, of the Option, (ii) the transfer, in whole or in part, of any shares acquired upon exercise of the Option, (iii) the operation of any law or regulation providing for the imputation of interest,
or (iv) the lapsing of any restriction with respect to any shares acquired upon exercise of the Option. The Option is not exercisable unless the tax withholding obligations of the Participating Company Group are satisfied. Accordingly, the
Company shall have no obligation to deliver shares of Stock or to release shares of Stock from an escrow established pursuant to this Option Agreement until the tax withholding obligations of the Participating Company Group have been satisfied by
the Optionee. 

  
 5 

 4.5 Certificate Registration. Except in the event the Exercise Price is paid
by means of a Cashless Exercise, the certificate for the shares as to which the Option is exercised shall be registered in the name of the Optionee, or, if applicable, in the names of the heirs of the Optionee. 

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 laws 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 OPTIONEE IS CAUTIONED THAT THE OPTION MAY NOT BE EXERCISED
UNLESS THE FOREGOING CONDITIONS ARE SATISFIED. ACCORDINGLY, THE OPTIONEE 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 Optionee 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. 

The Option may be exercised during the lifetime of the Optionee only by the Optionee or the Optionee’s guardian or legal
representative and may not be assigned or transferred in any manner except by will or by the laws of descent and distribution. Following the death of the Optionee, the Option, to the extent provided in Section 7, may be exercised by the
Optionee’s legal representative or by any person empowered to do so under the deceased Optionee’s will or under the then applicable laws of descent and distribution. 

 

	 	6.	TERMINATION OF THE OPTION. 

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

  
 6 

	 	7.	EFFECT OF TERMINATION OF SERVICE.

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

(c) Termination After Change in Control. If the Optionee’s Service ceases as a result of Termination After Change in
Control (as defined below), (i) the Option, to the extent unexercised and exercisable on the date on which the Optionee’s Service terminated, may be exercised by the Optionee (or the Optionee’s guardian or legal representative) at any
time prior to the expiration of six (6) months after the date on which the Optionee’s Service terminated, but in any event no later than the Option Expiration Date, and (ii) the Option shall become immediately vested and exercisable
in full as of the date on which the Optionee’s Service terminated. 
 (d) Other Termination of Service. If
the Optionee’s Service terminates for any reason, except Disability, death or Termination After Change in Control, the Option, to the extent unexercised and exercisable by the Optionee on the date on which the Optionee’s Service
terminated, may be exercised by the Optionee at any time prior to the expiration of three (3) months (or such other longer period of time as determined by the Board, in its discretion) after the date on which the Optionee’s Service
terminated, but in any event no later than the Option Expiration Date. 
 7.2 Additional Limitations on Option
Exercise. Notwithstanding the provisions of Section 7.1, the Option may not be exercised after the Optionee’s termination of Service to the extent that the shares to be acquired upon exercise of the Option would be subject to
the Unvested Share Repurchase Option as provided in Section 11. 
 7.3 Extension if Exercise Prevented by Law.
Notwithstanding the foregoing, 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 three (3) months
after the date the Optionee is notified by the Company that the Option is exercisable, but in any event no later than the Option Expiration Date. 

  
 7 

 7.4 Extension if Optionee Subject to Section 16(b). Notwithstanding the
foregoing, if a sale within the applicable time periods set forth in Section 7.1 of shares acquired upon the exercise of the Option would subject the Optionee to suit under Section 16(b) of the Exchange Act, the Option shall remain
exercisable until the earliest to occur of (i) the tenth (10th) day following the date on which a sale of such shares by the Optionee would no longer be subject to such suit, (ii) the one hundred and ninetieth (190th) day after
the Optionee’s termination of Service, or (iii) the Option Expiration Date. 
 7.5 Certain Definitions.

 (a) “Termination After Change in Control” shall mean either of the following events occurring within
twelve (12) months after a Change in Control: 
 (i) termination by the Participating Company Group of the Optionee’s
Service with the Participating Company Group for any reason other than for Cause (as defined below); or 
 (ii) the
Optionee’s resignation for Good Reason (as defined below) from all capacities in which the Optionee is then rendering Service to the Participating Company Group within a reasonable period of time following the event constituting Good Reason.

 Notwithstanding any provision herein to the contrary, Termination After Change in Control shall not include any termination of the
Optionee’s Service with the Participating Company Group that (1) is for Cause (as defined below); (2) is a result of the Optionee’s death or disability; (3) is a result of the Optionee’s voluntary termination of Service
other than for Good Reason; or (4) occurs prior to the effectiveness of a Change in Control. 
 (b)
“Cause” shall mean any of the following: (i) the Optionee’s theft, dishonesty, or falsification of any Participating Company documents or records; (ii) the Optionee’s improper use or disclosure of a
Participating Company’s confidential or proprietary information; (iii) any action by the Optionee that has a detrimental effect on a Participating Company’s reputation or business; (iv) the Optionee’s failure or inability to
perform any reasonable assigned duties after written notice from a Participating Company of, and a reasonable opportunity to cure, such failure or inability; (v) any material breach by the Optionee of any employment agreement between the
Optionee and a Participating Company, which breach is not cured pursuant to the terms of such agreement; or (vi) the Optionee’s conviction (including any plea of guilty or nolo contendere) of any criminal act that impairs the
Optionee’s ability to perform his or her duties with a Participating Company. 
 (c) “Good Reason”
shall mean any one or more of the following: 
 (i) without the Optionee’s express written consent, the assignment to the
Optionee of any duties, or any limitation of the Optionee’s responsibilities, substantially inconsistent with the Optionee’s positions, duties, responsibilities and status with the Participating Company Group immediately prior to the date
of the Change in Control; 

  
 8 

 (ii) without the Optionee’s express written consent, the relocation of the principal
place of the Optionee’s Service to a location that is more than fifty (50) miles from the Optionee’s principal place of Service immediately prior to the date of the Change in Control, or the imposition of travel requirements
substantially more demanding of the Optionee than such travel requirements existing immediately prior to the date of the Change in Control; 
 (iii) any failure by the Participating Company Group to pay, or any material reduction by the Participating Company Group of, (1) the Optionee’s base salary in effect immediately prior to the
date of the Change in Control (unless reductions comparable in amount and duration are concurrently made for all other employees of the Participating Company Group with responsibilities, organizational level and title comparable to the
Optionee’s), or (2) the Optionee’s bonus compensation, if any, in effect immediately prior to the date of the Change in Control (subject to applicable performance requirements with respect to the actual amount of bonus compensation
earned by the Optionee); or 
 (iv) any failure by the Participating Company Group to (1) continue to provide the Optionee
with the opportunity to participate, on terms no less favorable than those in effect for the benefit of any employee or service provider group that customarily includes a person holding the employment or service provider position or a comparable
position with the Participating Company Group then held by the Optionee, in any benefit or compensation plans and programs, including, but not limited to, the Participating Company Group’s life, disability, health, dental, medical, savings,
profit sharing, stock purchase and retirement plans, if any, in which the Optionee was participating immediately prior to the date of the Change in Control, or their equivalent, or (2) provide the Optionee with all other fringe benefits (or
their equivalent) from time to time in effect for the benefit of any employee or service provider group that customarily includes a person holding the employment or service provider position or a comparable position with the Participating Company
Group then held by the Optionee. 
  

	 	8.	CHANGE IN CONTROL. 

8.1 Definitions. 
 (a) An “Ownership Change Event” shall be deemed to have occurred if any of the following occurs with respect to the Company: (i) the direct or indirect sale or exchange in a
single or series of related transactions by the shareholders of the Company of more than fifty percent (50%) of the voting stock of the Company; (ii) a merger or consolidation in which the Company is a party; (iii) the sale, exchange,
or transfer of all or substantially all of the assets of the Company; or (iv) a liquidation or dissolution of the Company. 
 (b) A “Change in Control” shall mean an Ownership Change Event or a series of related Ownership Change Events (collectively, a “Transaction”) wherein the
shareholders of the Company immediately before the Transaction do not retain immediately after the Transaction, in substantially the same proportions as their ownership of shares of the Company’s voting stock

  
 9 

 
immediately before the Transaction, direct or indirect beneficial ownership of more than fifty percent (50%) of the total combined voting power of the outstanding voting securities of the
Company or, in the case of a Transaction described in Section 8.1(a)(iii), the corporation or other business entity to which the assets of the Company were transferred (the “Transferee”), as the case may be. For purposes
of the preceding sentence, indirect beneficial ownership shall include, without limitation, an interest resulting from ownership of the voting securities of one or more corporations or other business entities that own the Company or the Transferee,
as the case may be, either directly or through one or more subsidiary corporations or other business entities. The Board shall have the right to determine whether multiple sales or exchanges of the voting securities of the Company or multiple
Ownership Change Events are related, and its determination shall be final, binding and conclusive. 
 8.2 Effect of Change in
Control on Option. In the event of a Change in Control, the surviving, continuing, successor, or purchasing corporation or other business entity or parent thereof, as the case may be (the “Acquiring Corporation”), may,
without the consent of the Optionee, either assume the Company’s rights and obligations under the Option or substitute for the Option a substantially equivalent option for the Acquiring Corporation’s stock. In the event the Acquiring
Corporation elects not to assume the Company’s rights and obligations under the Option or substitute for the Option in connection with the Change in Control, and provided that the Optionee’s Service has not terminated prior to such date,
all shares acquired upon exercise of the Option shall be Vested Shares for purposes of Section 11 as of the date ten (10) days prior to the date of the Change in Control. Any vesting of the Option that was permissible solely by reason of
this Section 8.2 shall be conditioned upon the consummation of the Change in Control. The Option shall terminate and cease to be outstanding effective as of the date of the Change in Control to the extent that the Option is neither assumed or
substituted for by the Acquiring Corporation in connection with the Change in Control nor exercised as of the date 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. 

 

	 	9.	ADJUSTMENTS FOR CHANGES IN CAPITAL
STRUCTURE. 

 In the event of any stock dividend, stock split,
reverse stock split, recapitalization, combination, reclassification, or similar change in the capital structure of the Company, appropriate adjustments shall be made in the number, Exercise Price and class of shares of stock subject to the Option.
If a majority of the shares that are of the same class as the shares that are subject to the Option are exchanged for, converted into, or otherwise become (whether or not pursuant to an Ownership Change Event) shares of another corporation (the
“New Shares”), the Board may unilaterally amend the Option to provide that the Option is exercisable for New Shares. In the event of any such amendment, the Number of Option Shares and the Exercise Price shall be adjusted in
a fair and equitable manner, as determined by the Board, in its discretion. Notwithstanding the foregoing, any fractional share resulting from an adjustment pursuant to this Section 9 shall be rounded down to the nearest whole number, and 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. The adjustments determined by the Board pursuant to this Section 9 shall be final, binding and conclusive. 

  
 10 

	 	10.	RIGHTS AS A SHAREHOLDER, EMPLOYEE OR
CONSULTANT. 

 The Optionee shall have no rights as a
shareholder with respect to any shares covered by the Option until the date of the issuance of a certificate for 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 such certificate is issued, except as provided in Section 9. If the Optionee is
an Employee, the Optionee understands and acknowledges that, except as otherwise provided in a separate, written employment agreement between a Participating Company and the Optionee, the Optionee’s employment is “at will” and is for
no specified term. Nothing in this Option Agreement shall confer upon the Optionee 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
Optionee’s Service as 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 Optionee’s Service with the Participating Company Group is
terminated for any reason or no reason, with or without cause, or, if the Optionee, the Optionee’s legal representative, or other holder of shares acquired upon exercise of the Option 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”). 
 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 that 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 Optionee within sixty (60) days after (a) termination of the Optionee’s Service (or exercise of the Option, if later) 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 Optionee have extended the time for the exercise of
the Unvested Share Repurchase Option. The Unvested Share Repurchase Option must be exercised, if at all, for all of the Unvested Shares, except as the Company and the Optionee otherwise agree. 

11.4 Payment for Shares and Return of Shares to Company. The purchase price per share being repurchased by the Company shall be an
amount equal to the Optionee’s original cost per share, as adjusted pursuant to Section 9 (the “Repurchase Price”). The Company shall pay the aggregate Repurchase Price to the Optionee in cash within thirty
(30) days after the date of the written notice to the Optionee of the Company’s exercise of the Unvested Share Repurchase Option. For purposes of the foregoing, cancellation of any purchase money indebtedness of the Optionee to any
Participating Company for the shares shall be treated as 

  
 11 

 
payment to the Optionee 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 Optionee at the same
time as the delivery of the Repurchase Price to the Optionee. 
 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 Optionee is entitled by reason of the Optionee’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. For purposes of determining the Vested Shares
following an Ownership Change Event, credited Service shall include all Service with any corporation that 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. 
  

	 	12.	RIGHT OF FIRST REFUSAL. 

12.1 Grant of Right of First Refusal. Except as provided in Section 12.7 below, in the event the Optionee, the Optionee’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 shareholder 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 Optionee 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 Optionee proposes to transfer any Transfer Shares to more than one Proposed
Transferee, the Optionee shall provide a separate Transfer Notice for the proposed transfer to each Proposed Transferee. The Transfer Notice shall be signed by both the Optionee and the Proposed Transferee and must constitute a binding commitment of
the Optionee and the Proposed Transferee for the transfer of the Transfer Shares to the Proposed Transferee subject only to the Right of First Refusal. 

  
 12 

 12.3 Bona Fide Transfer. If the Company determines that the information provided by
the Optionee in the Transfer Notice is insufficient to establish the bona fide nature of a proposed voluntary transfer, the Company shall give the Optionee written notice of the Optionee’s failure to comply with the procedure described in this
Section 12, and the Optionee shall have no right to transfer the Transfer Shares without first complying with the procedure described in this Section 12. The Optionee 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 Optionee otherwise agree) at the purchase price and on the terms set forth in the Transfer Notice by
delivery to the Optionee 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 Optionee or issued by a person other than the Optionee with respect to a proposed transfer to the same Proposed Transferee. If the Company exercises the Right of First Refusal, the Company and the Optionee
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 Optionee to any Participating Company shall be treated as payment to the
Optionee in cash to the extent of the unpaid principal and any accrued interest canceled. 
 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 Optionee otherwise agree) within the period specified in Section 12.4 above, the Optionee 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. The
Company shall have the right to demand further assurances from the Optionee 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 Optionee, shall again be subject to the Right of First Refusal and shall require compliance by the Optionee 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 

  
 13 

 
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. 
 12.9 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 Acquiring Corporation assumes the Company’s rights and obligations under the Option or substitutes a substantially equivalent option for the Acquiring Corporation’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.	ESCROW. 

 13.1 Establishment of Escrow. To ensure that shares subject to the Unvested Share Repurchase Option will be available for repurchase, the Company may require the Optionee to deposit the certificate
evidencing the shares that the Optionee purchases upon exercise of the Option with an agent designated by the Company under the terms and conditions of an escrow agreement approved by the Company. If the Company does not require such deposit as a
condition of exercise of the Option, the Company reserves the right at any time to require the Optionee to so deposit the certificate in escrow. Upon the occurrence of an Ownership Change Event or a 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, any and all new, substituted or additional securities or other property to which the Optionee is
entitled by reason of the Optionee’s ownership of shares of Stock acquired upon exercise of the Option that remain, following such Ownership Change Event 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 such shares of Stock immediately before such event. The Company shall bear the expenses of the escrow. 
 13.2 Delivery of Shares to Optionee. As soon as practicable after the expiration of the Unvested Share Repurchase Option, but not more frequently than twice each calendar year, the escrow agent
shall deliver to the Optionee the shares and any other property no longer subject to such restriction. 

  
 14 

 13.3 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 Optionee shall be given to the escrow agent, and any payment required to be given to the
Optionee shall be given to the escrow agent. Within thirty (30) days after payment by the Company, the escrow agent shall deliver the shares and any other property that the Company has purchased to the Company and shall deliver the payment
received from the Company to the Optionee. 
  

	 	14.	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 Optionee is entitled by reason of the Optionee’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. 

 

	 	15.	NOTICE OF SALES UPON DISQUALIFYING
DISPOSITION. 

 The Optionee shall dispose of the shares
acquired pursuant to the Option only in accordance with the provisions of this Option Agreement. In addition, if the Notice designates this Option as an Incentive Stock Option, the Optionee shall (a) promptly notify the Chief Financial Officer
of the Company if the Optionee disposes of any of the shares acquired pursuant to the Option within one (1) year after the date the Optionee exercises all or part of the Option or within two (2) years after the Date of Option Grant and
(b) provide the Company with a description of the circumstances of such disposition. Until such time as the Optionee disposes of such shares in a manner consistent with the provisions of this Option Agreement, unless otherwise expressly
authorized by the Company, the Optionee shall hold all shares acquired pursuant to the Option in the Optionee’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 Option 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 Optionee 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. 
  

	 	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

  
 15 

 
law restrictions on all certificates representing shares of stock subject to the provisions of this Option Agreement. The Optionee 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 Optionee 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 AN UNVESTED
SHARE REPURCHASE OPTION 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 REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO A RIGHT OF FIRST REFUSAL OPTION
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.”

 16.4 “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 TO [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 Optionee 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 

  
 16 

 
registration statement filed under the Securities Act, the Optionee 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. The foregoing limitation shall not
apply to shares registered in the public offering under the Securities Act. 
  

	 	18.	RESTRICTIONS ON TRANSFER OF SHARES.

 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 Optionee), assigned, pledged, hypothecated or otherwise disposed of, including by operation of law, in any manner that 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 that 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. 
  

	 	19.	MISCELLANEOUS PROVISIONS. 

19.1 Binding Effect. Subject to the restrictions on transfer set forth herein, this Option Agreement shall inure to the benefit of
and be binding upon the parties hereto and their respective heirs, executors, administrators, successors and assigns. 
 19.2
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 8.2 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 Optionee unless such termination or amendment is necessary to comply with any applicable law or government regulation or is required to enable the Option, if
designated an Incentive Stock Option in the Notice, to qualify as an Incentive Stock Option. No amendment or addition to this Option Agreement shall be effective unless in writing. 

19.3 Notices. 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 or upon deposit in the United States Post Office, by registered or certified mail, with postage and fees prepaid,
addressed to the other party at the address shown below that party’s signature or at such other address as such party may designate in writing from time to time to the other party. 

19.4 Integrated Agreement. The Notice, this Option Agreement and the Plan constitute the entire understanding and agreement of the
Optionee and the Participating Company Group with respect to the subject matter contained herein or therein and supersedes any prior 

  
 17 

 
agreements, understandings, restrictions, representations, or warranties among the Optionee and the Participating Company Group with respect to such subject matter other than those as set forth
or provided for herein or therein. To the extent contemplated herein or therein, the provisions of the Notice and the Option Agreement shall survive any exercise of the Option and shall remain in full force and effect. 

19.5 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. 
 19.6
Counterparts. The 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 

									
	TM Incentive Stock Option	  		  	Optionee:	  	  

	TM Nonstatutory Stock Option	  		  		  	Date:	  	  

 

 STOCK OPTION EXERCISE NOTICE 

(IMMEDIATELY EXERCISABLE) 
  

					
	 Vital Therapies, Inc.

Attention: Chief Financial Officer
	  		  	
	  
	  		  	
			
	  
	  		  	

 Ladies and Gentlemen: 
 1. Option. I was granted an option (the “Option”) to purchase shares of the common stock (the “Shares”) of Vital Therapies, Inc. (the
“Company”) pursuant to the Company’s 2012 Stock Option Plan (the “Plan”), my Notice of Grant of Stock Option (the “Notice”) and my Stock Option Agreement (the
“Option Agreement”) as follows: 
  

					
	 Grant Number:
	  	  

		
	 Date of Option 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: 
  

					
	 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:
	  	$	  	  

					
		
	 Tender of Company Stock:
	  	   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. Optionee 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 Option 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 Option Agreement, including the Unvested Share Repurchase Option and the Right of First Refusal set forth therein, 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 Company’s standard Joint Escrow Instructions. 
 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 that 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. 
 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 

 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 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. AN ELECTION UNDER SECTION 83(b) MUST BE FILED 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 IS MY SOLE RESPONSIBILITY, EVEN IF I REQUEST THE COMPANY OR ITS REPRESENTATIVES TO FILE SUCH ELECTION ON MY BEHALF. 
 I understand that I am purchasing the Shares pursuant to the terms of the Plan, the 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.
	
	VITAL THERAPIES, INC.
		
	By:	 	  

	Title:	 	  

	Dated:	 	  

  
 3EX-10.8

 Exhibit 10.8 
 VITAL THERAPIES, INC. 
 EXECUTIVE INCENTIVE COMPENSATION PLAN

 Adopted by the Board of Directors on July 8, 2013 

1. Purposes of the Plan. The Plan is intended to increase shareholder value and the success of the Company by motivating Employees
to (a) perform to the best of their abilities, and (b) achieve the Company’s objectives. 
 2.
Definitions. 
 (a) “Affiliate” means any corporation or other entity (including, but not limited to,
partnerships and joint ventures) controlled by the Company. 
 (b) “Actual Award” means as to any Performance
Period, the actual award (if any) payable to a Participant for the Performance Period, subject to the Committee’s authority under Section 3(d) to modify the award. 
 (c) “Board” means the Board of Directors of the Company. 
 (d)
“Bonus Pool” means the pool of funds available for distribution to Participants. Subject to the terms of the Plan, the Committee establishes the Bonus Pool for each Performance Period. 

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

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

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

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

(n) “Target Award” means the target award, at 100% performance achievement, payable under the Plan to a Participant for
the Performance Period, as determined by the Committee in accordance with Section 3(b). 
 (o) “Termination of
Service” means a cessation of the employee-employer relationship between an Employee and the Company or an Affiliate for any reason, including, but not by way of limitation, a termination by resignation, discharge, death, Disability,
retirement, or the disaffiliation of an Affiliate, but excluding any such termination where there is a simultaneous reemployment by the Company or an Affiliate. 
 3. Selection of Participants and Determination of Awards. 
 (a) Selection
of Participants. The Committee, in its sole discretion, will select the Employees who will be Participants for any Performance Period. Participation in the Plan is in the sole discretion of the Committee, on a Performance Period by Performance
Period basis. Accordingly, an Employee who is a Participant for a given Performance Period in no way is guaranteed or assured of being selected for participation in any subsequent Performance Period or Periods. 

(b) Determination of Target Awards. The Committee, in its sole discretion, will establish a Target Award for each Participant for
a particular Performance Period, which generally will be a percentage of a Participant’s average annual base salary for the Performance Period. 
 (c) Bonus Pool. Each Performance Period, the Committee, in its sole discretion, will establish a Bonus Pool, which pool may be established before, during or after the applicable Performance Period.
Actual Awards will be paid from the Bonus Pool. 
 (d) Discretion to Modify Awards. Notwithstanding any contrary
provision of the Plan, the Committee may, in its sole discretion and at any time, (i) increase, reduce or eliminate a Participant’s Actual Award, and/or (ii) increase, reduce or eliminate the amount allocated to the Bonus Pool. The
Actual Award may be below, at or above the Target Award, in the Committee’s discretion. The Committee may determine the amount of any reduction on the basis of such factors as it deems relevant, and will not be required to establish any
allocation or weighting with respect to the factors it considers. 

  
 -2-

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

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

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

  
 -3-

 It is the intent that this Plan comply with or be exempt from the requirements of Code
Section 409A so that none of the payments to be provided hereunder will be subject to the additional tax imposed under Code Section 409A, and any ambiguities herein will be interpreted to so comply or be exempt. Each Participant
acknowledges and agrees that the Company and its Affiliates make no representations with respect to the application of Code Section 409A to any Award and other tax consequences to any payments under the Plan and, by the acceptance of any Award
or any such payments, the Participant agrees to accept the potential application of Code Section 409A and the other tax consequences of any payments made pursuant to the Plan. 

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

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

(a) Committee is the Administrator. The Plan will be administered by the Committee. The Committee will consist of not less than two
(2) members of the Board. The members of the Committee will be appointed from time to time by, and serve at the pleasure of, the Board. 
 (b) Committee Authority. It will be the duty of the Committee to administer the Plan in accordance with the Plan’s provisions. The Committee will have all powers and discretion necessary or
appropriate to administer the Plan and to control its operation, including, but not limited to, the power to (i) determine which Employees will be granted awards, (ii) prescribe the terms and conditions of awards, (iii) interpret the
Plan and the awards, (iv) adopt such procedures and subplans as are necessary or appropriate to permit participation in the Plan by Employees who are foreign nationals or employed outside of the United States, (v) adopt rules for the
administration, interpretation and application of the Plan as are consistent therewith, and (vi) interpret, amend or revoke any such rules. 
 (c) Decisions Binding. All determinations and decisions made by the Committee, the Board, and any delegate of the Committee pursuant to the provisions of the Plan will be final, conclusive, and
binding on all persons, and will be given the maximum deference permitted by law. 
 (d) Delegation by Committee. The
Committee, in its sole discretion and on such terms and conditions as it may provide, may delegate all or part of its authority and powers under the Plan to one or more directors and/or officers of the Company. 

(e) Indemnification. Each person who is or will have been a member of the Committee will be indemnified and held harmless by
the Company against and from (i) any loss, cost, liability, or expense that may be imposed upon or reasonably incurred by him or her in 

  
 -4-

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

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

  
 -5-

 (g) Recoupment of Actual Awards. A Participant’s rights with respect to any
Actual Award hereunder shall in all events be subject to (i) any right that the Company may have under any Company recoupment policy or other agreement or arrangement with the Participant, or (ii) any right or obligation that the Company
may have regarding the clawback of “incentive-based compensation” under Section 10D of the Securities and Exchange Act of 1934, as amended, and any applicable rules and regulations promulgated thereunder from time to time by the U.S.
Securities and Exchange Commission. 
 7. Amendment, Termination, and Duration. 

(a) Amendment, Suspension, or Termination. The Board, in its sole discretion, may amend or terminate the Plan, or any part thereof,
at any time and for any reason. The amendment, suspension or termination of the Plan will not, without the consent of the Participant, alter or impair any rights or obligations under any Actual Award theretofore earned by such Participant. No award
may be granted during any period of suspension or after termination of the Plan. 
 (b) Duration of Plan. The Plan will
commence on the date specified herein, and subject to Section 7(a) (regarding the Board’s right to amend or terminate the Plan), will remain in effect thereafter. 
 8. Legal Construction. 
 (a) Gender and Number. Except where
otherwise indicated by the context, any masculine term used herein also will include the feminine; the plural will include the singular and the singular will include the plural. 

(b) Severability. In the event any provision of the Plan will be held illegal or invalid for any reason, the illegality or
invalidity will not affect the remaining parts of the Plan, and the Plan will be construed and enforced as if the illegal or invalid provision had not been included. 
 (c) Requirements of Law. The granting of awards under the Plan will be subject to all applicable laws, rules and regulations, and to such approvals by any governmental agencies or national
securities exchanges as may be required. 
 (d) Governing Law. The Plan and all awards will be construed in accordance
with and governed by the laws of the State of California, but without regard to its conflict of law provisions. 
 (e) Bonus
Plan. The Plan is intended to be a “bonus program” as defined under U.S. Department of Labor regulation 2510.3-2(c) and will be construed and administered in accordance with such intention. 

(f) Captions. Captions are provided herein for convenience only, and will not serve as a basis for interpretation or construction
of the Plan. 

  
 -6-

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00222-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00222-of-00352.parquet"}]]