Document:

EX-10.8

 EXHIBIT 10.8 

ACACIA COMMUNICATIONS, INC. 

NONSTATUTORY STOCK OPTION AGREEMENT 

Acacia Communications, Inc. (the “Company”) hereby grants the following stock option pursuant to its 2016 Equity 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. 
  

							
		 		 	ACACIA COMMUNICATIONS, INC.
	   
	 	  
	 	  
	 	  

	Signature of Participant	 		 		 	
	   
	 	  
	 	By:	 	   

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

 ACACIA COMMUNICATIONS, 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 2016 Equity Incentive Plan (the “Plan”), the number of Shares set forth in the Notice of Grant of common stock, $0.0001 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”). 

  
 - 2 - 

 (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 or confidentiality provisions of any employment contract, confidentiality and nondisclosure agreement or 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 party to an employment or severance agreement with the Company that contains a definition of “cause” for termination of employment, “Cause” shall have the meaning ascribed to such term in such agreement. 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. 

 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. 

  
 - 3 - 

	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 

ACACIA COMMUNICATIONS, INC. 

Stock Option Exercise Notice 
 Acacia
Communications, Inc. 
 Three Clock Tower Place, Suite 100 

Maynard, MA 01754 
 Dear Sir or Madam: 

I,
                                        
(the “Participant”), hereby irrevocably exercise the right to purchase                        shares of the Common
Stock, $0.0001 par value per share (the “Shares”), of Acacia Communications, Inc. (the “Company”) at $             per share pursuant to the
Company’s 2016 Equity 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): 

 

	
	
	   

  
 - 5 -EX-10.9

 EXHIBIT 10.9 

ACACIA COMMUNICATIONS, INC. 

RESTRICTED STOCK UNIT AGREEMENT 

Acacia Communications, Inc. (the “Company”) hereby grants the following restricted stock units pursuant to its 2016 Equity
Incentive Plan. The terms and conditions attached hereto are also a part hereof. 
 Notice of Grant 

 

			
	Name of recipient (the “Participant”):	 	 
	Grant Date:	 	 
	 Number of Restricted Stock Units (“RSUs”)

granted:
	 	 
	 Number, if any, of RSUs that vest

immediately on the grant date:
	 	 
	RSUs that are subject to vesting schedule:	 	 
	Vesting Start Date:	 	 

 Vesting Schedule: 
  

			
	 	  	 
	 	  	 
	 	  	 
	All vesting is dependent on the Participant continuing to perform services for the Company, as provided herein.

 This grant of RSUs 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. 
  

							
		 		 	ACACIA COMMUNICATIONS, INC.
	   
	 	  
	 	  
	 	  

	Signature of Participant	 		 		 	
	   
	 	  
	 	By:	 	   

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

 ACACIA COMMUNICATIONS, INC. 

Restricted Stock Unit Agreement 

Incorporated Terms and Conditions 

For valuable consideration, receipt of which is acknowledged, the parties hereto agree as follows: 

 

	 	1.	Award of Restricted Stock Units. 

 In consideration of services rendered and to be
rendered to the Company, by the Participant, the Company has granted to the Participant, subject to the terms and conditions set forth in this Restricted Stock Unit Agreement (this “Agreement”) and in the Company’s 2016 Equity
Incentive Plan (the “Plan”), an award with respect to the number of restricted shares units (the “RSUs”) set forth in the Notice of Grant that forms part of this Agreement (the “Notice of Grant”).
Each RSU represents the right to receive one share of common stock, $0.0001 par value per share, of the Company (the “Common Stock”) upon vesting of the RSU, subject to the terms and conditions set forth herein. 

 

	 	2.	Vesting. 

 The RSUs shall vest in accordance with the Vesting Schedule set forth in the
Notice of Grant (the “Vesting Schedule”). Upon the vesting of the RSU, the Company will deliver to the Participant, for each RSU that becomes vested, one share of Common Stock, subject to the payment of any taxes pursuant to
Section 7. The Common Stock will be delivered to the Participant as soon as practicable following each vesting date, but in any event within 30 days of such date. 
  

	 	3.	Forfeiture of Unvested RSUs Upon Cessation of Service. 

 In the event that the
Participant ceases to perform services to the Company for any reason or no reason, with or without cause, all of the RSUs that are unvested as of the time of such cessation shall be forfeited immediately and automatically to the Company, without the
payment of any consideration to the Participant, effective as of such cessation. The Participant shall have no further rights with respect to the unvested RSUs or any Common Stock that may have been issuable with respect thereto. If the Participant
provides services to a subsidiary of the Company, any references in this Agreement to provision of services to the Company shall instead be deemed to refer to service with such subsidiary. 

 

	 	4.	Restrictions on Transfer. 

 The Participant shall not sell, assign, transfer, pledge,
hypothecate or otherwise dispose of, by operation of law or otherwise (collectively “transfer”) any RSUs, or any interest therein. The Company shall not be required to treat as the owner of any RSUs or issue any Common Stock to any
transferee to whom such RSUs have been transferred in violation of any of the provisions of this Agreement. 

	 	5.	Rights as a Shareholder. 

 The Participant shall have no rights as a stockholder of the
Company with respect to any shares of Common Stock that may be issuable with respect to the RSUs until the issuance of the shares of Common Stock to the Participant following the vesting of the RSUs. 

 

	 	6.	Provisions of the Plan. 

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

	 	7.	Tax Matters. 

 (a) Acknowledgments; No Section 83(b) Election. The
Participant acknowledges that he or she is responsible for obtaining the advice of the Participant’s own tax advisors with respect to the award of RSUs and the Participant 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 RSUs. The Participant understands that the Participant (and not the Company) shall be responsible for the Participant’s tax liability that
may arise in connection with the acquisition, vesting and/or disposition of the RSUs. The Participant acknowledges that no election under Section 83(b) of the Internal Revenue Code, as amended, is available with respect to RSUs. 

(b) Withholding. The Participant acknowledges and agrees that the Company has the right to deduct from payments of any kind otherwise
due to the Participant any federal, state, local or other taxes of any kind required by law to be withheld with respect to the vesting of the RSUs. At such time as the Participant is not aware of any material nonpublic information about the Company
or the Common Stock, the Participant shall execute the instructions set forth in Schedule A attached hereto (the “Automatic Sale Instructions”) as the means of satisfying such tax obligation. If the Participant does not
execute the Automatic Sale Instructions prior to an applicable vesting date, then the Participant agrees that if under applicable law the Participant will owe taxes at such vesting date on the portion of the Award then vested the Company shall be
entitled to immediate payment from the Participant of the amount of any tax required to be withheld by the Company. The Company shall not deliver any shares of Common Stock to the Participant until it is satisfied that all required withholdings have
been made. 
  

	 	8.	Miscellaneous. 

 (a) Authority of Compensation Committee. In making any decisions
or taking any actions with respect to the matters covered by this Agreement, the Compensation Committee shall have all of the authority and discretion, and shall be subject to all of the protections, provided for in the Plan. All decisions and
actions by the Compensation Committee with respect to this Agreement shall be made in the Compensation Committee’s discretion and shall be final and binding on the Participant. 

 (b) No Right to Continued Service. The Participant acknowledges and agrees that,
notwithstanding the fact that the vesting of the RSUs is contingent upon his or her continued service to the Company, this Agreement does not constitute an express or implied promise of continued service relationship with the Participant or confer
upon the Participant any rights with respect to a continued service relationship with the Company. 
 (c) Section 409A. The RSUs
awarded pursuant to this Agreement are intended to be exempt from or comply with the requirements of Section 409A of the Internal Revenue Code and the Treasury Regulations issued thereunder (“Section 409A”). The delivery of
shares of Common Stock on the vesting of the RSUs may not be accelerated or deferred unless permitted or required by Section 409A. 

(d) Participant’s Acknowledgements. The Participant acknowledges that he or she: (i) has read this Agreement; (ii) has
been represented in the preparation, negotiation and execution of this Agreement by legal counsel of the Participant’s own choice or has voluntarily declined to seek such counsel; (iii) understands the terms and consequences of this
Agreement; and (iv) is fully aware of the legal and binding effect of this Agreement. 
 (e) 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. 

I hereby acknowledge that I have read this Agreement, have received and read the Plan, and understand and agree to comply with the terms and conditions of
this Agreement and the Plan. 
  

	
	
	   

	PARTICIPANT ACCEPTANCE

 Schedule A 

Automatic Sale Instructions 
 The
undersigned hereby consents and agrees that any taxes due on a vesting date as a result of the vesting of RSUs on such date shall be paid through an automatic sale of shares as follows: 

(a) Upon any vesting of RSUs pursuant to Section 2 hereof, the Company shall sell, or arrange for the sale of, such number of shares of
Common Stock issuable with respect to the RSUs that vest pursuant to Section 2 as is sufficient to generate net proceeds sufficient to satisfy the Company’s minimum statutory withholding obligations with respect to the income recognized by
the Participant upon the vesting of the RSUs (based on minimum statutory withholding rates for all tax purposes, including payroll and social security taxes, that are applicable to such income), and the Company shall retain such net proceeds in
satisfaction of such tax withholding obligations. 
 (b) The Participant hereby appoints the President and Chief Executive Officer and
Secretary of the Company, and either of them acting alone and with full power of substitution, to serve as his or her attorneys in fact to sell the Participant’s Common Stock in accordance with this Schedule A. The Participant agrees to execute
and deliver such documents, instruments and certificates as may reasonably be required in connection with the sale of the Shares pursuant to this Schedule A. 

(c) The Participant represents to the Company that, as of the date hereof, he or she is not aware of any material nonpublic information about
the Company or the Common Stock. The Participant and the Company have structured this Agreement, including this Schedule A, to constitute a “binding contract” relating to the sale of Common Stock, consistent with the affirmative defense to
liability under Section 10(b) of the Securities Exchange Act of 1934 under Rule 10b5-1(c) promulgated under such Act. 
 The Company
shall not deliver any shares of Common Stock to the Participant until it is satisfied that all required withholdings have been made. 
  

			
	
	 
		
	Participant Name:	 	 

 
			
		
	Date:

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