Document:

EX-10.5

 Exhibit 10.5 
  

 
 November 26, 2018 

Dr. Christopher Stevens 
 Retention Bonus Agreement

 Dear Chris, 
 On behalf of Arsanis,
Inc. (the “Company”), I would like to thank you for your continued service to the Company and emphasize your importance to our organization and its success. I am pleased to inform you that, as an incentive for your continued
service to the Company, the Company is making you eligible for a special retention bonus, subject to the satisfaction of the terms and conditions described in this letter agreement. 

 

	1.	 Retention Bonus – You are eligible to receive a retention bonus in an amount equal to
$494,000, less all applicable taxes and withholdings, (the “Retention Bonus”) upon the earliest to occur of the following (the date on which the earliest of the following to occur, the “Payment Eligibility
Date”), provided you remain employed by the Company through the Payment Eligibility Date and that you otherwise satisfy the terms and conditions of this letter agreement: 

 

	 	(i)	 March 31, 2019; 

 

	 	(ii)	 the closing of a Change of Control (as defined in Exhibit A to this letter agreement) (the
“Closing”); or 

  

	 	(iii)	 the termination of your employment by the Company without “Cause” (as defined in
Exhibit A to this letter agreement). 

  

	2.	 Interaction with Terms of Employment Letter Agreement – You agree and acknowledge that, in
order to receive the Retention Bonus, you hereby relinquish your rights to receive any and all severance pay and bonus amounts you would otherwise be entitled to receive upon a termination of your employment (together, the “Severance
Payments”) pursuant to Sections 10(a), 10(b) or 10(c) of the Amended and Restated Letter Agreement between you and the Company dated October 10, 2017 (the “Employment Letter”), whether or not the Retention
Bonus is paid to you as a result of the termination of your employment by the Company without Cause. For the avoidance of doubt, you shall continue to be eligible to receive payment from the Company for benefits continuation and any equity
acceleration described in the Employment Letter, in accordance with the terms and conditions of the Employment Letter. The terms of your Employment Letter shall otherwise remain in full force and effect. By signing this agreement, you agree and
acknowledge that you shall have no further rights with respect to the Severance Payments. 

	3.	 Conditions to Payment – Release, Compliance, and Cooperation. In order to receive payment of
the Retention Bonus, you must sign a release and, if applicable, separation agreement in a form with customary terms to be supplied by the Company at or promptly following the Payment Eligibility Date that includes, among other provisions,
(i) a release of claims in favor of the Company and its agents, (ii) confirmation of continued compliance with the Invention, Non-Competition, Non-Solicitation
and Non-Disclosure Agreement you previously signed in connection with your employment with the Company (the “NDA”), and, (iii) if the payment of the Retention Bonus is as a result
of a termination without Cause, an agreement to provide post-employment cooperation to the Company, and which release (the “Release”) becomes enforceable within 60 days (or such shorter period as the Company specifies)
following the Payment Eligibility Date. For the avoidance of doubt, the Retention Bonus will be paid pursuant to the timing provision set forth in Section 4 below, and you may sign the Release at any time prior to the date by which it must
become enforceable. The “Release Effective Date” is the date the Release becomes enforceable, provided that if the 60-day period for providing an enforceable Release extends into a
calendar year subsequent to the year containing the Payment Eligibility Date, the Release Effective Date will be treated, solely for payment timing purposes, as occurring no earlier than the first business day of such subsequent year unless payment
may be made earlier consistent with Section 409A (as defined below). 

 You must continue to comply with all of the
provisions of your NDA in order to be eligible for this program; provided, however, that the Company agrees that, in consideration of the Release, it will waive the post-employment non-competition restriction
set forth in Section 4(a) of the NDA. You must also, while employed, perform the material duties assigned to you that are consistent with your position (or those of a position to which you have been transferred by the Company or that are
reasonably required of you in connection with a Closing transition, if applicable) and must assist the Company to the best of your ability in any efforts to effect a Change of Control or to transition services thereafter, if applicable. 

 

	4.	 Payment Timing – Assuming you satisfy the conditions to payment, you will receive the
Retention Bonus in a single lump sum, less all applicable taxes and withholdings, on the first regular payroll date occurring after the Release Effective Date. 

 

	5.	 Amendment – This letter agreement shall be binding upon the parties and may not be modified
in any manner, except by an instrument in writing of concurrent or subsequent date signed by duly authorized representatives of the parties hereto. 

  

	6.	 Withholding; Section 409A. All payments and benefits hereunder
will be subject to reduction for applicable tax withholdings. Any payments made over time are to be treated as a series of separate payments for purposes of Section 409A of the Internal Revenue Code of 1986, as amended
(“Section 409A” of the “Code”). This letter agreement is intended to provide for payments that are exempt from or comply with the provisions of Section 409A and
this letter agreement must, to the extent practicable, be construed in accordance therewith. Terms defined in this letter agreement will have the 

  
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meanings given such terms under Section 409A if and to the extent required to comply with Section 409A. In any event, the Company makes no representations or warranty and will have no
liability to you or any other person if any provisions of or payments under this letter agreement are determined to constitute deferred compensation subject to Section 409A but not to satisfy the conditions of that section. 

 

	7.	 Payment to Heirs. If you should die after satisfaction of the conditions to payment under this
letter agreement have been met, any unpaid amounts will be paid in accordance with the terms of this letter agreement to the executors, personal representatives, or administrators of your estate. The Company may determine whether the estate or other
such recipient must provide a Release if you had not previously done so. 

  

	8.	 Source of Payment. Nothing herein may be construed as establishing a trust or as requiring the
Company to set aside funds to meet its obligations hereunder. 

  

	9.	 Notices. Any notice, request, demand, and other communication provided for by this letter
agreement must be in writing and will be effective when delivered in person or three business days after it is deposited in the United States mail, postage prepaid, registered or certified, or one business day after it is provided to a national
overnight carrier, and addressed to you at your last known address on the books of the Company or, in the case of the Company, at its principal place of business, attention of the President and Chief Executive Officer, or to such other address as
either party may specify by notice in the manner provided in this Section 9. 

  

	10.	 Severability. Each provision of this letter agreement must be considered severable such
that if any one provision or clause conflicts with existing or future applicable law, or may not be given full effect because of such law, this will not affect any other provision of the letter agreement, which, consistent with such law, will remain
in full force and effect. All surviving clauses must be construed so as to effectuate the purpose and intent of the parties. 

  

	11.	 Interpretation. The parties agree that this letter agreement will be construed without regard to
any presumption or rule requiring construction or interpretation against the drafting party. References in this letter agreement to “include” or “including” should be read as though they said “without limitation” or
equivalent forms. 

  

	12.	 Counterparts. This letter agreement may be executed in two or more counterparts, each of which
will be an original and all of which together will constitute one and the same instrument. 

  

	13.	 Binding Effect; Assignment and Assumption. This letter agreement will be binding upon and inure
to the benefit of the parties, any successors or assigns of the Company and your heirs and the personal representative(s) or executor(s) of your estate. The Company may assign this letter agreement in connection with a Change of Control to an
acquirer in a Change of Control (the “Acquirer”). Any obligation of the Company to pay 

  
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any compensation under this letter agreement will be deemed to have been appropriately satisfied if the Acquirer assumes the obligations under this letter agreement. You may not assign this
letter agreement to others, provided, however, that nothing precludes you from designating beneficiaries to receive compensation or benefits, if any, payable under this letter agreement upon your death. 

 

	14.	 Governing Law; Jury Trial Waiver. This letter agreement will be governed by the laws of the
Commonwealth of Massachusetts without regard to its conflicts of laws principles. Any action, suit or other legal proceeding arising under or relating to any provision of this letter agreement must be commenced only in a court of the Commonwealth of
Massachusetts (or, if appropriate, a federal court located within the Commonwealth of Massachusetts, and the Company and you each consents to the jurisdiction of such a court. IF AND TO THE EXTENT PERMITTED BY APPLICABLE LAW, EACH OF THE COMPANY AND
YOU HEREBY IRREVOCABLY WAIVE ANY RIGHT TO A TRIAL BY JURY IN ANY ACTION, SUIT OR OTHER LEGAL PROCEEDING ARISING UNDER OR RELATING TO ANY PROVISION OF THIS LETTER AGREEMENT OR THE RELEASE IT CONTEMPLATES. 

 

	15.	 Effect of this Letter Agreement – Nothing in this letter agreement imposes any requirement
on the Company or the Company’s shareholders to complete any Change of Control with respect to the Company. Nothing in this letter agreement restricts either your or the Company’s rights to terminate your employment at any time, with or
without Cause or notice, and for any or no reason, nor does it change your status as an at-will employee. This letter agreement supersedes any written or oral communications between the Company and you with
respect to retention bonuses. For the avoidance of doubt, notwithstanding the terms of the Employment Letter, you will not be eligible for, nor shall you have a right to receive, the Severance Payments. 

If you have any questions about the matters covered in this letter agreement, please contact Sheila Daly at sheila.daly@arsanis.com. 

 

			
	Very truly yours,
		
	By:	 	 /s/ Michael Gray

		 	Michael Gray
		 	Chief Financial Officer & Chief Operating Officer

 Intending to be legally bound, I have signed this letter agreement as of the date set forth below. 

 

							
	 /s/ Christopher Stevens
	 		 	Date:	 	 November 26, 2018

	Christopher Stevens	 		 		 	

  
 4 

 Exhibit A 

“Cause” means, for purposes of this letter agreement, the following, as determined by the Board in its reasonable judgment: 

 

	(i)	 the commission of, or indictment or conviction for, any felony, or any other crime involving dishonesty;

  

	(ii)	 participation in any fraud, deliberate and substantial misconduct, breach of duty of loyalty or breach of
fiduciary duty against the Company; 

  

	(iii)	 intentional and substantial damage to any property of the Company; 

 

	(iv)	 failure of performance of your duties (not attributable to sickness, disability or death) after reasonable
written notice no later than thirty (30) days following the occurrence of the failure and a 30-day opportunity to cure, provided, however, that such opportunity to cure shall only apply to any failure
that the Board, in its reasonable discretion, deems susceptible to cure; or 

  

	(v)	 your breach of any material provision of your Employment Letter, the NDA, or any other agreement to which you
and the Company are both parties, after reasonable written notice no later than thirty (30) days following the occurrence of the breach and a 30-day opportunity to cure, provided, however, that such
opportunity to cure shall only apply to any breach that the Board, in its reasonable discretion, deems susceptible to cure, and that any breach by you of your obligations of confidentiality or non-competition
under the NDA shall be deemed not susceptible to cure. 

 “Change of Control” means the first to occur of any of
the following: (i) a merger or consolidation, business combination, acquisition or similar transaction (a “Transaction”) in which (A) the Company is a constituent party, or (B) a subsidiary of the Company is a constituent
party and the Company issues shares of its capital stock pursuant to such Transaction, except in the case of either clause (A) or (B) any such Transaction involving the Company or a subsidiary of the Company in which the beneficial owners of
the shares of capital stock of the Company outstanding immediately prior to such Transaction continue beneficially to own, immediately following such Transaction, at least a majority by voting power of the capital stock of (x) the surviving or
resulting corporation or (y) if the surviving or resulting corporation is a wholly owned subsidiary of another corporation immediately following such Transaction, the parent corporation of such surviving or resulting corporation; (ii) the
sale, lease, transfer, exclusive license or other disposition, in a single transaction or series of related transactions, by the Company or a Company subsidiary of all or substantially all the assets of the Company and the Company subsidiaries taken
as a whole (except in connection with a Transaction not constituting a Change of Control under clause (i) or where such sale, lease, transfer, exclusive license or other disposition is to a wholly owned Company subsidiary); or (iii) the
sale or transfer, in a single transaction or series of related transactions, by the stockholders of the Company of more than 50% by voting power of the then-outstanding capital stock of the Company to any Person or entity or group of
affiliated Persons or entities. For purposes of this definition, “Person” means an individual, a corporation, an association, a partnership, an estate, a trust and any other entity or organization, other than the Company. 

  
 5EX-10.6

 Exhibit 10.6 

ARSANIS, INC. 
 RESTRICTED STOCK
AGREEMENT 
 Arsanis, Inc. (the “Company”) has selected you to receive the following restricted stock award pursuant to
its 2017 Equity Incentive Plan. The terms and conditions attached hereto are also a part hereof. 
 Notice of Grant 

 

			
	Name of recipient (the “Recipient”):	 	
	Grant Date:	 	
	Number of shares of the restricted common stock awarded:	 	
	Vesting Start Date:	 	

 Vesting Schedule: 
  

			
	First Anniversary of Vesting Start Date	  	25%
	Each Monthly Anniversary Thereafter	  	2.0833%
	
	All vesting is dependent on the Recipient remaining employed by the Company, as provided herein.

 Please confirm your acceptance of this restricted stock award and of the terms and conditions of this
Agreement by signing a copy of this Agreement where indicated below. 
  

			
	 ARSANIS, INC.

		
	By:	 	 
		 	 Name of Officer

		 	 Title:

  

	
	Accepted and Agreed:
	
	   

	 Signature of Recipient

 

	 Street Address
  

	City/State/Zip Code

 ARSANIS, INC. 

Restricted Stock Agreement 

Incorporated Terms and Conditions 

The terms and conditions of the award of shares of restricted common stock of the Company (the “Restricted Shares”) made to
the Recipient, as set forth in the Notice of Grant that forms part of this agreement (the “Notice of Grant”), are as follows: 

1. Issuance of Restricted Shares. 

(a) The Restricted Shares are issued to the Recipient, effective as of the Grant Date set forth in the Notice of Grant, in consideration of
services rendered and to be rendered by the Recipient to the Company. 
 (b) The Restricted Shares will initially be issued by the Company
in book entry form only, in the name of the Recipient. Following the vesting of any Restricted Shares pursuant to Section 2 below, the Company shall, if requested by the Recipient, issue and deliver to the Recipient a certificate representing
the vested Restricted Shares. The Recipient agrees that the Restricted Shares shall be subject to the forfeiture provisions set forth in Section 3 of this Agreement and the restrictions on transfer set forth in Section 4 of this
Agreement. 
 2. Vesting. Unless otherwise provided in this Agreement in the Company’s 2017 Equity Incentive Plan (the
“Plan”) or in another agreement between the Recipient and the Company, the Restricted Shares shall vest in accordance with the vesting schedule set forth in the Notice of Grant. Any fractional number of Restricted Shares resulting
from the application of the vesting schedule shall be rounded down to the nearest whole number of Restricted Shares. 
 3. Forfeiture of
Unvested Restricted Shares Upon Employment Termination. 
 In the event that the Recipient ceases to be employed by the Company for any
reason or no reason, with or without cause, all of the Restricted Shares that are unvested as of the time of such employment termination shall be forfeited immediately and automatically to the Company, without the payment of any consideration to the
Recipient, effective as of such termination of employment. The Recipient shall have no further rights with respect to any Restricted Shares that are so forfeited. If the Recipient is employed by a subsidiary of the Company, any references in this
Agreement to employment with the Company shall instead be deemed to refer to employment with such subsidiary. 
 4. Restrictions on
Transfer. 
 Except as set forth in the Plan, the Recipient shall not sell, assign, transfer, pledge, hypothecate or otherwise dispose
of, by operation of law or otherwise (collectively “transfer”) any Restricted Shares, or any interest therein, until such Restricted Shares have vested. The Company shall not be required (i) to transfer on its books any of the
Restricted Shares which have been transferred in violation of any of the provisions of this Agreement or the Plan or (ii) to treat as owner of such Restricted Shares or to pay dividends to any transferee to whom such Restricted Shares have been
transferred in violation of any of the provisions of this Agreement or the Plan. 

 5. Restrictive Legends. 

The book entry account reflecting the issuance of the Restricted Shares in the name of the Recipient shall bear a legend or other notation
upon substantially the following terms: 
 “These shares of stock are subject to forfeiture provisions and restrictions on transfer set
forth in a certain Restricted Stock Agreement between the corporation and the registered owner of these shares (or his or her predecessor in interest), and such Agreement is available for inspection without charge at the office of the Secretary of
the corporation.” 
 6. Rights as a Shareholder. 

Except as otherwise provided in this Agreement, for so long as the Recipient is the registered owner of the Restricted Shares, the Recipient
shall have all rights as a shareholder with respect to the Restricted Shares, whether vested or unvested, including, without limitation, rights to vote the Restricted Shares and act in respect of the Restricted Shares at any meeting of shareholders;
provided that, as provided in the Plan, the payment of dividends on unvested Restricted Shares shall be deferred until the vesting of such shares. 

7. Provisions of the Plan. 

This Agreement is subject to the provisions of the Plan, a copy of which is furnished to the Recipient with this Agreement. 

8. Tax Matters. 
 (a)
Acknowledgments; Section 83(b) Election. The Recipient acknowledges that he or she is responsible for obtaining the advice of the Recipient’s own tax advisors with respect to the acquisition of the Restricted Shares
and the Recipient is relying solely on such advisors and not on any statements or representations of the Company or any of its agents with respect to the tax consequences relating to the Restricted Shares. The Recipient understands that the
Recipient (and not the Company) shall be responsible for the Recipient’s tax liability that may arise in connection with the acquisition, vesting and/or disposition of the Restricted Shares. The Recipient acknowledges that he or she has been
informed of the availability of making an election under Section 83(b) of the Internal Revenue Code, as amended (a “Section 83(b) Election”) with respect to the issuance of the Restricted Shares. The
Recipient agrees to promptly deliver written notice to the Company in the event the Recipient makes a Section 83(b) Election with respect to the Restricted Shares. 

(b) Withholding. The Recipient acknowledges and agrees that the Company has the right to deduct from payments of any kind otherwise due
to the Recipient any federal, state, local or other taxes of any kind required by law to be withheld with respect to the issuance or vesting of the Restricted Shares. 

 9. Miscellaneous. 

(a) No Right to Continued Employment. The Recipient acknowledges and agrees that, notwithstanding the fact that the vesting of the
Restricted Shares is contingent upon his or her continued employment by the Company, this Agreement does not constitute an express or implied promise of continued employment or confer upon the Recipient any rights with respect to continued
employment by the Company. 
 (b) Governing Law. This Agreement shall be construed, interpreted and enforced in accordance with the
internal laws of the State of Delaware without regard to any applicable conflicts of laws provisions. 
 (c) Recipient’s
Acknowledgments. The Recipient acknowledges that he or she has read this Agreement, has received and read the Plan, and understands the terms and conditions of this Agreement and the Plan.

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