EX-10.6



 Exhibit 10.6 

VISTERRA, INC. 
 NONSTATUTORY
STOCK OPTION AGREEMENT 
 Visterra, Inc. (the “Company”) hereby grants the following stock option pursuant to its 2017
Stock Incentive Plan. The terms and conditions attached hereto are also a part hereof. 
 Notice of Grant 

 

			
	Name of optionee (the “Participant”):	 	
	Grant Date:	 	
	Number of shares of the Company’s Common Stock subject to this option (“Shares”):	 	
	Option exercise price per Share:	 	
	Number, if any, of Shares that vest immediately on the grant date:	 	
	Shares that are subject to vesting schedule:	 	
	Vesting Start Date:	 	
	Final Exercise Date:	 	

 Vesting Schedule: 
  

	
	     
	     
	     
	All vesting is dependent on the Participant remaining an Eligible Participant, as provided herein.

 This option satisfies in full all commitments that the Company has to the Participant with respect to the
issuance of stock, stock options or other equity securities. 
  

							
		 		 	VISTERRA, INC.
			
	  
	 		 	
	Signature of Participant	 		 	
				
	  
	 		 	By:	 	  

	Street Address	 		 		 	Name of Officer
		 		 		 	Title:
	  
	 		 		 	
	City/State/Zip Code	 		 		 	








 VISTERRA, INC. 

Nonstatutory Stock Option Agreement 

Incorporated Terms and Conditions 
  

	1.	Grant of Option. 

 This agreement evidences the grant by the Company, on the grant date
(the “Grant Date”) set forth in the Notice of Grant that forms part of this agreement (the “Notice of Grant”), to the Participant of an option to purchase, in whole or in part, on the terms provided herein and in
the Company’s 2017 Stock Incentive Plan (the “Plan”), the number of Shares set forth in the Notice of Grant of common stock, $         par value per share, of the Company (“Common
Stock”), at the exercise price per Share set forth in the Notice of Grant. Unless earlier terminated, this option shall expire at 5:00 p.m., Eastern time, on the Final Exercise Date set forth in the Notice of Grant (the “Final
Exercise Date”). 
 It is intended that the option evidenced by this agreement shall not be an incentive stock option as defined in
Section 422 of the Internal Revenue Code of 1986, as amended, and any regulations promulgated thereunder (the “Code”). Except as otherwise indicated by the context, the term “Participant”, as used in this
option, shall be deemed to include any person who acquires the right to exercise this option validly under its terms. 
  

	2.	Vesting Schedule. 

 This option will become exercisable (“vest”) in
accordance with the vesting schedule set forth in the Notice of Grant. 
 The right of exercise shall be cumulative so that to the extent
the option is not exercised in any period to the maximum extent permissible it shall continue to be exercisable, in whole or in part, with respect to all Shares for which it is vested until the earlier of the Final Exercise Date or the termination
of this option under Section 3 hereof or the Plan. 
  

	3.	Exercise of Option. 

 (a) Form of Exercise. Each election to exercise this option
shall be in writing, in the form of the Stock Option Exercise Notice attached as Annex A, signed by the Participant, and received by the Company at its principal office, accompanied by this agreement, or in such other form (which may be
electronic) as is approved by the Company, together with payment in full in the manner provided in the Plan. The Participant may purchase less than the number of shares covered hereby, provided that no partial exercise of this option may be for any
fractional share. 
 (b) Continuous Relationship with the Company Required. Except as otherwise provided in this Section 3, this
option may not be exercised unless the Participant, at the time he or she exercises this option, is, and has been at all times since the Grant Date, an employee, director or officer of, or consultant or advisor to, the Company or any other entity
the employees, officers, directors, consultants, or advisors of which are eligible to receive option grants under the Plan (an “Eligible Participant”). 

  
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 (c) Termination of Relationship with the Company. If the Participant ceases to be an
Eligible Participant for any reason, then, except as provided in paragraphs (d) and (e) below, the right to exercise this option shall terminate three months after such cessation (but in no event after the Final Exercise Date),
provided that this option shall be exercisable only to the extent that the Participant was entitled to exercise this option on the date of such cessation. Notwithstanding the foregoing, if the Participant, prior to the Final Exercise
Date, violates the non-competition, non-solicitation, or confidentiality provisions of any employment contract, confidentiality and nondisclosure agreement or any other agreement between the Participant and the Company, the right to exercise this
option shall terminate immediately upon such violation. 
 (d) Exercise Period Upon Death or Disability. If the Participant dies or
becomes disabled (within the meaning of Section 22(e)(3) of the Code) prior to the Final Exercise Date while he or she is an Eligible Participant and the Company has not terminated such relationship for “cause” as specified in
paragraph (e) below, this option shall be exercisable, within the period of one year following the date of death or disability of the Participant, by the Participant (or in the case of death by an authorized transferee), provided
that this option shall be exercisable only to the extent that this option was exercisable by the Participant on the date of his or her death or disability, and further provided that this option shall not be exercisable after the Final
Exercise Date. 
 (e) Termination for Cause. If, prior to the Final Exercise Date, the Participant’s employment or other
relationship with the Company is terminated by the Company for Cause (as defined below), the right to exercise this option shall terminate immediately upon the effective date of such termination of employment or other relationship. If, prior to the
Final Exercise Date, the Participant is given notice by the Company of the termination of his or her employment by the Company for Cause, and the effective date of such employment termination is subsequent to the date of delivery of such notice, the
right to exercise this option shall be suspended from the time of the delivery of such notice until the earlier of (i) such time as it is determined or otherwise agreed that the Participant’s employment shall not be terminated for Cause as
provided in such notice or (ii) the effective date of such termination of employment (in which case the right to exercise this option shall, pursuant to the preceding sentence, terminate upon the effective date of such termination of
employment). If the Participant is subject to an individual employment or severance agreement with the Company or eligible to participate in a Company severance plan or arrangement, in any case which agreement, plan or arrangement contains a
definition of “cause” for termination of employment, “Cause” shall have the meaning ascribed to such term in such agreement, plan or arrangement. Otherwise, “Cause” shall mean willful misconduct by the Participant or
willful failure by the Participant to perform his or her responsibilities to the Company (including, without limitation, breach by the Participant of any provision of any employment, consulting, advisory, nondisclosure, non-competition or other
similar agreement between the Participant and the Company), as determined by the Company, which determination shall be conclusive. The Participant’s employment shall be considered to have been terminated for Cause if the Company determines,
within 30 days after the Participant’s resignation, that termination for Cause was warranted. 
  

	4.	Withholding. 


  
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 No Shares will be issued pursuant to the exercise of this option unless and until the Participant
pays to the Company, or makes provision satisfactory to the Company for payment of, any federal, state or local withholding taxes required by law to be withheld in respect of this option. 

 

	5.	Transfer Restrictions; Clawback. 

 (a) This option may not be sold, assigned,
transferred, pledged or otherwise encumbered by the Participant, either voluntarily or by operation of law, except by will or the laws of descent and distribution, and, during the lifetime of the Participant, this option shall be exercisable only by
the Participant. 
 (b) In accepting this option, the Participant agrees to be bound by any clawback policy that the Company may adopt in
the future. 
  

	6.	Provisions of the Plan. 

 This option is subject to the provisions of the Plan (including
the provisions relating to amendments to the Plan), a copy of which is furnished to the Participant with this option. 

  
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 ANNEX A 

VISTERRA, INC. 
 Stock Option
Exercise Notice 
 Visterra, Inc. 
 One Kendall Square,
Suite B3301 
 Cambridge, MA 02139 
 Dear Sir or Madam: 

I,
                             (the “Participant”), hereby irrevocably exercise the right to
purchase                  shares of the Common Stock, $         par value per share (the “Shares”), of Visterra,
Inc. (the “Company”) at $         per share pursuant to the Company’s 2017 Stock Incentive Plan and a stock option agreement with the Company dated
                     (the “Option Agreement”). Enclosed herewith is a payment of $        ,
the aggregate purchase price for the Shares. The certificate for the Shares should be registered in my name as it appears below or, if so indicated below, jointly in my name and the name of the person designated below, with right of survivorship.

  

			
	Dated:	 	  

	
	  

	Signature
	Print Name:
	
	Address:
	  

	  


 Name and address of persons in whose name the Shares are to be jointly registered (if applicable): 

 

	
	  



  
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