Document:

EX-10.11

 EXHIBIT 10.11 

ACACIA COMMUNICATIONS, INC. 

Severance and Change in Control Benefits Plan 

1. Establishment of Plan. Acacia Communications, Inc., a Delaware corporation hereby establishes an unfunded severance benefits plan
(the “Plan”) that is intended to be a welfare benefit plan within the meaning of Section 3(1) of ERISA. The Plan is in effect for Covered Employees who experience a Covered Termination occurring after the Effective Date and
before the termination of this Plan. 
 2. Purpose. The purpose of the Plan is to establish the conditions under which Covered
Employees will receive the severance benefits described herein if employment with the Company (or its successor in a Change in Control) terminates under the circumstances specified herein. The severance benefits paid under the Plan are intended to
assist Covered Employees in making a transition to new employment and are not intended to be a reward for prior service with the Company. 

3. Definitions. For purposes of this Plan, 

(a) “Base Salary” shall mean, for any Covered Employee, such Covered Employee’s base rate of pay as in
effect immediately before a Covered Termination (or prior to the Change in Control, if greater) and exclusive of any bonuses, overtime pay, shift differentials, “adders,” any other form of premium pay, or other forms of compensation. 

(b) “Benefits Continuation” shall have the meaning set forth in Section 8(a) hereof. 

(c) “Board” shall mean the Board of Directors of Acacia Communications, Inc. 

(d) “Bonus” shall mean, for any Covered Employee, the target annual bonus established by the compensation
committee of the Board that the employee was eligible to earn for the year in which the Covered Termination occurs (or for the year in which the Change in Control occurs, if greater), without regard to whether the performance goals applicable to
such bonus had been established or satisfied at the date of termination of employment. 
 (e) “Cause” shall
mean (i) a material breach of any material term of any applicable offer letter or employment agreement or any employee proprietary information and inventions, nondisclosure, non-competition, non-solicitation (or similar) agreement with the
Company, (ii) a plea of guilty or nolo contendere to, or conviction of, the commission of a felony offense or a crime of dishonesty, (iii) repeated unexplained or unjustified absences, refusals or failures to carry out the lawful
directions of the Board or the Chief Executive Officer, or the employee’s supervisor, or (iv) willful misconduct that results or is reasonably likely to result in material harm to the Company; and, solely in

  
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the case of (i), (iii) and (iv), if determined by the Board in good faith to be reasonably susceptible of cure, Executive has failed to cure such breach or conduct within thirty
(30) days after his receipt of written notice from the Company stating in reasonable specificity the nature of such breach or conduct. 

(f) “Change in Control” shall mean the occurrence of any of the following events, provided that such event or
occurrence constitutes a change in the ownership or effective control of the Company, or a change in the ownership of a substantial portion of the assets of the Company, as defined in Treasury Regulation §§ 1.409A-3(i)(5)(v),
(vi) and (vii): (i) the acquisition by an individual, entity or group (within the meaning of Section 13(d)(3) or 14(d)(2) of the Securities Exchange Act of 1934 (the “Exchange Act”)) (a “Person”) of
beneficial ownership of any capital stock of the Company if, after such acquisition, such Person beneficially owns (within the meaning of Rule 13d-3 under the Exchange Act) fifty percent (50%) or more of either (x) the then-outstanding
shares of common stock of the Company (the “Outstanding Company Common Stock”) or (y) the combined voting power of the then-outstanding securities of the Company entitled to vote generally in the election of directors (the
“Outstanding Company Voting Securities”); provided, however, that for purposes of this subsection (i), the following acquisitions shall not constitute a Change in Control: (1) any acquisition directly from the Company or
(2) any acquisition by any entity pursuant to a Business Combination (as defined below) which complies with clauses (x) and (y) of subsection (iii) of this definition; or (ii) a change in the composition of the Board that
results in the Continuing Directors (as defined below) no longer constituting a majority of the Board (or, if applicable, the Board of Directors of a successor corporation to the Company), where the term “Continuing Director” means
at any date a member of the Board (x) who was a member of the Board on the date of the initial adoption of the Plan by the Board or (y) who was nominated or elected subsequent to such date by at least a majority of the directors who were
Continuing Directors at the time of such nomination or election or whose election to the Board was recommended or endorsed by at least a majority of the directors who were Continuing Directors at the time of such nomination or election; provided,
however, that there shall be excluded from this clause (y) any individual whose initial assumption of office occurred as a result of an actual or threatened election contest with respect to the election or removal of directors or other actual
or threatened solicitation of proxies or consents, by or on behalf of a person other than the Board; or (iii) the consummation of a merger, consolidation, reorganization, recapitalization or share exchange involving the Company, or a sale or
other disposition of all or substantially all of the assets of the Company (a “Business Combination”), unless, immediately following such Business Combination, each of the following two (2) conditions is satisfied: (x) all
or substantially all of the individuals and entities who were the beneficial owners of the Outstanding Company Common Stock and Outstanding Company Voting Securities immediately prior to such Business Combination beneficially own, directly or
indirectly, more than fifty percent (50%) of the then-outstanding shares of common stock and the combined voting power of the then-outstanding securities entitled to vote generally in the election of directors, respectively, of the resulting or

  
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acquiring corporation in such Business Combination (which shall include, without limitation, a corporation which as a result of such transaction owns the Company or substantially all of the
Company’s assets either directly or through one (1) or more subsidiaries) (such resulting or acquiring corporation is referred to herein as the “Acquiring Corporation”) in substantially the same proportions as their
ownership of the Outstanding Company Common Stock and Outstanding Company Voting Securities, respectively, immediately prior to such Business Combination and (y) no Person (excluding any employee benefit plan (or related trust) maintained or
sponsored by the Company or by the Acquiring Corporation) beneficially owns, directly or indirectly, fifty percent (50%) or more of the then-outstanding shares of common stock of the Acquiring Corporation, or of the combined voting power of the
then-outstanding securities of such corporation entitled to vote generally in the election of directors (except to the extent that such ownership existed prior to the Business Combination); or (iv) the liquidation or dissolution of the Company.

 (g) “Change in Control Termination” shall mean a termination without Cause or a resignation for Good
Reason within the one (1) year period following the closing of a Change in Control. 
 (h) “COBRA”
shall mean the Consolidated Omnibus Budget Reconciliation Act. 
 (i) “Code” shall mean the Internal
Revenue Code of 1986, as amended. 
 (j) “Company” shall mean Acacia Communications, Inc. (or, following a
Change in Control, any successor thereto) together with the wholly-owned subsidiaries of Acacia Communications, Inc., provided, that, for purposes of the definition of Change in Control in Section 3(f) hereof, Company shall mean solely Acacia
Communications, Inc. 
 (k) “Covered Employees” shall mean all Regular
Full-Time Employees (both exempt and non-exempt) who are Executives who experience a Covered Termination and who are not designated as ineligible to receive severance
benefits under the Plan as provided in Section 5 hereof. For the avoidance of doubt, neither Temporary Employees nor Part-Time Employees are eligible for severance benefits under the Plan. An employee’s
full-time, part-time or temporary status for the purpose of this Plan shall be determined in good faith by the Plan Administrator upon review of the employee’s status immediately before termination. Any
person who is classified by the Company as an independent contractor or third party employee is not eligible for severance benefits even if such classification is modified retroactively. 

(l) “Covered Termination” shall mean a termination designated by the Plan Administrator as (i) a Change
in Control Termination or (ii) a Non-Change in Control Termination. The Plan Administrator shall determine whether a particular termination is a Change in Control Termination or a Non-Change in Control Termination, and may determine, based on
the facts and circumstances, that a termination does not qualify as a Covered Termination. 

  
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 (m) “Disability” shall mean that the employee, due to a physical
or mental disability, for a period of ninety (90) consecutive days, or one hundred and eighty (180) days in the aggregate whether or not consecutive, during any three hundred and sixty (360) day period, is unable to perform the
services required by the employee’s position at the Company. A determination of Disability shall be made by a physician selected by the Company. 

(n) “Effective Date” shall mean the date on which the first public filing in connection with an initial
public offering of the Company is made. 
 (o) “ERISA” shall mean the Employee Retirement Income Security
Act of 1974, as amended. 
 (p) “Executive” shall mean any employee of the Company holding the title of
Vice President or above. For the avoidance of doubt, no second-level Vice President (i.e., a functional area Vice President that reports to one (1) or more executive level Vice Presidents) shall be deemed an “Executive” hereunder
unless (i) the employee subsequently satisfies the definition of Executive, in which case such employee shall automatically be deemed an “Executive” at such time or (ii) the employee is specifically designated as a Covered
Employee by the Plan Administrator. 
 (q) “Good Reason” is defined as: (i) a material diminution in
the employee’s base compensation; (ii) a material diminution in the employee’s authority, duties, or responsibilities; (iii) a material change in the geographic location at which the employee must perform services to the Company
(it being understood that any change of fifty (50) or more miles would be material); or (iv) any other action or inaction that constitutes a material breach by the Company of any agreement under which the employee provides services;
provided, however, that, in any case, the employee has not consented to the condition which would otherwise give rise to a Good Reason. In order to establish a “Good Reason” for terminating employment, an employee must provide written
notice to the Company of the existence of the condition giving rise to the Good Reason, which notice must be provided within ninety (90) days of the initial existence of such condition, the Company must fail to cure the condition within thirty
(30) days thereafter, and an employee’s termination of employment must occur no later than one (1) year following the initial existence of the condition giving rise to Good Reason. 

(r) “Non-Change in Control Termination” shall mean a termination without Cause prior to or more than twelve
(12) months after the closing of a Change in Control. 
 (s) “Part-Time Employees” shall mean
employees who are not Regular Full-Time Employees or Temporary Employees and are treated as such by the Company. 

  
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 (t) “Participants” shall mean Covered Employees. 

(u) “Plan Administrator” shall have the meaning set forth in Section 14 hereof. 

(v) “Release” shall have the meaning set forth in Section 6 hereof. 

(w) “Release Effective Date” shall have the meaning set forth in Section 13(c)(1) hereof. 

(x) “Regular Full-Time Employees” shall mean employees, other than Temporary Employees, normally scheduled to
work at least thirty (30) hours a week unless the Company’s local practices, as from time to time in force, whether or not in writing, establish a different hours threshold for regular full-time employees. 

(y) “Temporary Employees” are employees treated as such by the Company, whether or not in writing. 

4. Coverage. Subject to satisfaction of the eligibility and other requirements set forth in Sections 5 and 6 of this Plan, a Covered
Employee will be entitled to receive severance benefits under the Plan if such employee experiences a Covered Termination. 
 5.
Eligibility for Severance Benefits. The following employees will not be eligible for severance benefits, except to the extent specifically determined in good faith otherwise by the Plan Administrator: (a) an employee who is
terminated for Cause; (b) an employee who terminates employment as a result of an inability to perform his duties due to Disability, voluntarily retires or dies; (c) an employee who voluntarily terminates his employment, except, in the
case of a Change in Control Termination, for Good Reason; and (d) an employee who is employed for a specific period of time in accordance with the terms of a written offer letter or employment agreement. 

6. Release; Timing of Severance Benefits. Receipt of any severance payments or benefits under the Plan requires that the Covered
Employee: (a) comply with the provisions of any applicable proprietary information and inventions, nondisclosure, non-competition, non-solicitation (or similar) agreement with the Company, and other obligations to the Company; and
(b) execute and deliver a waiver and release in substantially the form attached hereto as Exhibit A under which the Covered Employee releases and discharges the Company and its affiliates from and on account of any and all claims that
relate to or arise out of the employment relationship between the Company and the Covered Employee (the “Release”) which Release becomes binding within sixty (60) days following the Covered Employee’s termination of
employment. The severance payments described herein will be paid in accordance with the terms of the Plan and otherwise on the Company’s regularly scheduled payroll dates in effect from time to time and the Benefits Continuation will be
paid in the amount and at the time premium payments are made by other participants in the Company’s health benefit plans with the same coverage. The payments shall be made or commence on the first payroll date after the Release Effective Date.

  
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 7. Cash Severance.  

(a) Non-Change in Control Termination. A Covered Employee who experiences a Non-Change in Control Termination
shall be entitled to receive continuation of such employee’s monthly Base Salary for the Severance Period indicated in the table below opposite such employee’s title.  

 

			
	 Title of Participant
	  	 Severance Period

	Chief Executive Officer	  	Twelve (12) months
	All other Participants	  	Nine (9) months

 (b) Change in Control Termination. A Covered Employee who experiences a Change in
Control Termination shall be entitled to receive: 
 (i) a single lump sum payment in an amount equal to the
product of such employee’s annual Base Salary and the multiple indicated in the table below opposite such employee’s title, payable on the Release Effective Date; and 

(ii) a single lump sum payment in an amount equal to the product of such employee’s Bonus and the multiple indicated in
the table below opposite such employee’s title, payable either at the same time as annual bonuses are paid to other employees of the Company or, if later, upon the Release Effective Date. 

 

			
	 Title of Participant
	  	 Multiple

	Chief Executive Officer	  	1.0
	All other Participants	  	0.75

  
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 For purposes of this Section 7, a Covered Employee’s title shall be such
employee’s title immediately prior to the Covered Termination or, if such employee’s title was changed in connection with the Change in Control, immediately prior to such change in connection with the Change in Control. 

8. Other Severance Benefits. In the event of a Covered Termination, a Covered Employee entitled to severance benefits under this Plan
shall be entitled to the following: 
 (a) Company contributions to the cost of COBRA coverage on behalf of the Covered
Employee and any applicable dependents for twelve (12) months (unless such period is shortened in accordance with the terms of this Plan) if the Covered Employee elects COBRA coverage, and only so long as such coverage continues in force. Such
costs shall be determined on the same basis as the Company’s contribution to Company-provided health and dental insurance coverage in effect for an active employee with the same coverage elections; provided that if the Covered Employee
commences new employment and is eligible for a new group health and dental plans, the Company’s continued contributions toward health and dental coverage shall end when the Covered Employee is enrolled under such new group health plans
(“Benefits Continuation”). For the avoidance of doubt, a Covered Employee shall not be required to enroll in any group health plan offered by a new employer to the extent such plans do not provide coverage that is substantially
similar to the coverage provided under the Company’s group health and dental plans in effect immediately prior to the Covered Termination. 

(b) Any unpaid annual bonus in respect to any completed bonus period which has ended prior to the date of the
Participant’s Covered Termination and which the Board deems granted to the Participant in its discretion pursuant to the Company’s contingent compensation program, payable at the same time as annual bonuses are paid to other employees of
the Company or, if later, upon the Release Effective Date. 
 9. Equity Awards. In the event of a Change in Control Termination, all
of a Covered Employee’s equity awards that are outstanding and unvested as of such termination, will fully accelerate and immediately vest on the date of such termination, and otherwise will continue to be dictated by the terms of the
applicable award agreements. For any other Covered Termination, the terms of the applicable award agreement will govern. For the avoidance of doubt, the vesting and acceleration terms set forth in any equity award agreement between the Covered
Employee and the Company outstanding immediately prior to the closing of an initial public offering of the Company that apply upon an event that is not a Covered Termination shall continue to apply and shall not be superseded by this Section 9.

 10. Recoupment. If a Covered Employee fails to comply with the terms of the Plan, including the provisions of Section 6
above, the Company may require payment to the Company of any benefits described in Sections 7 and 8 above that the Covered Employee has already received to the extent permitted by applicable law and with the “value” determined in the sole
and good faith discretion of the Plan Administrator. Payment is due in cash or by check within 

  
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thirty (30) days, or such earlier date as may be required by law or by any clawback policy that the Company adopts, after the Company provides notice to a Covered Employee that it is
enforcing this provision. Any benefits described in Sections 7 and 8 above not yet received by such Covered Employee will be immediately forfeited. 

11. Death. If a Participant dies after the date of his or her Covered Termination but before all payments or benefits to which such
Participant is entitled pursuant to the Plan have been paid or provided, payments will be made to any beneficiary designated by the Participant prior to or in connection with such Participant’s Covered Termination or, if no such beneficiary has
been designated, to the Participant’s estate. For the avoidance of doubt, if a Participant dies during the Benefits Continuation period provided for the Participant in Section 8(a), Benefits Continuation will continue for the
Participant’s applicable dependents for the remainder of the Benefits Continuation period provided for such Participant in Section 8(a). 

12. Withholding. The Company may withhold from any payment or benefit under the Plan: (a) any federal, state, or local income or
payroll taxes required by law to be withheld with respect to such payment; (b) such sum as the Company may reasonably estimate is necessary to cover any taxes for which the Company may be liable and which may be assessed with regard to such
payment; and (c) such other amounts as appropriately may be withheld under the Company’s payroll policies and procedures from time to time in effect. 

13. Section 409A. It is expected that the payments and benefits provided under this Plan will be exempt from the application of
Section 409A of the Code, and the guidance issued thereunder (“Section 409A”). The Plan shall be interpreted consistent with this intent to the maximum extent permitted and generally, with the provisions of Section 409A. A
termination of employment shall not be deemed to have occurred for purposes of any provision of this Plan providing for the payment of any amounts or benefits upon or following a termination of employment (which amounts or benefits constitute
nonqualified deferred compensation within the meaning of Section 409A) unless such termination is also a “separation from service” within the meaning of Section 409A and, for purposes of any such provision of this Plan,
references to a “termination,” “termination of employment” or like terms shall mean “separation from service”. Neither the Participant nor the Company shall have the right to accelerate or defer the delivery of any
payment or benefit except to the extent specifically permitted or required by Section 409A. 
 Notwithstanding the foregoing, to the
extent the severance payments or benefits under this Plan are subject to Section 409A, the following rules shall apply with respect to distribution of the payments and benefits, if any, to be provided to Participants under this Plan: 

(a) Each installment of the payments and benefits provided under this Plan will be treated as a separate “payment”
for purposes of Section 409A. Whenever a payment under this Plan specifies a payment period with reference to a number of days (e.g., “payment shall be made within ten (10) days following the date of termination”), the
actual date of payment within the specified period shall be in the Company’s sole discretion. Notwithstanding any other provision of this Plan to the contrary, in no event 

  
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shall any payment under this Plan that constitutes “non-qualified deferred compensation” for purposes of Section 409A be subject to transfer, offset, counterclaim or recoupment by
any other amount unless otherwise permitted by Section 409A. 
 (b) Notwithstanding any other payment provision herein
to the contrary, if the Company or appropriately-related affiliates become publicly-traded and a Covered Employee is deemed on the date of termination to be a “specified employee” within the meaning of that term under Code
Section 409A(a)(2)(B) with respect to such entity, then each of the following shall apply: 
 (i) With regard to any
payment that is considered “non-qualified deferred compensation” under Section 409A payable on account of a “separation from service,” such payment shall be made on the date which is the earlier of (A) the day following
the expiration of the six (6) month period measured from the date of such “separation from service” of the Covered Employee, and (B) the date of the Covered Employee’s death (the “Delay Period”) to the
extent required under Section 409A. Upon the expiration of the Delay Period, all payments delayed pursuant to this provision (whether otherwise payable in a single sum or in installments in the absence of such delay) shall be paid to or for the
Covered Employee in a lump sum, and all remaining payments due under this Plan shall be paid or provided for in accordance with the normal payment dates specified herein; and 

(ii) To the extent that any benefits to be provided during the Delay Period are considered “non-qualified deferred
compensation” under Section 409A payable on account of a “separation from service,” and such benefits are not otherwise exempt from Section 409A, the Covered Employee shall pay the cost of such benefits during the Delay
Period, and the Company shall reimburse the Covered Employee, to the extent that such costs would otherwise have been paid by the Company or to the extent that such benefits would otherwise have been provided by the Company at no cost to the Covered
Employee, the Company’s share of the cost of such benefits upon expiration of the Delay Period. Any remaining benefits shall be reimbursed or provided by the Company in accordance with the procedures specified in this Plan. 

(c) To the extent that severance benefits pursuant to this Plan are conditioned upon a Release, the Covered Employee shall
forfeit all rights to such payments and benefits unless such release is signed and delivered (and no longer subject to revocation, if applicable) within sixty (60) days following the date of the termination of the Covered Employee’s
employment with the Company. If the Release is no longer subject to revocation as provided in the preceding sentence, then the following shall apply: 

(i) To the extent any severance benefits to be provided are not “non-qualified deferred compensation” for purposes
of Section 409A, then such 

  
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benefits shall commence upon the first scheduled payment date immediately after the date the Release is executed and no longer subject to revocation (the “Release Effective
Date”). The first such cash payment shall include all amounts that otherwise would have been due prior thereto under the terms of this Agreement applied as though such payments commenced immediately upon the termination of Covered
Employee’s employment with the Company, and any payments made after the Release Effective Date shall continue as provided herein. The delayed benefits shall in any event expire at the time such benefits would have expired had such benefits
commenced immediately following the termination of Covered Employee’s employment with the Company. 
 (ii) To the
extent any such severance benefits to be provided are “non-qualified deferred compensation” for purposes of Section 409A, then the Release must become irrevocable within sixty (60) days of the date of termination and benefits
shall be made or commence upon the date provided in Section 6, provided that if the sixtieth day following the termination of Executive’s employment with the Company falls in the calendar year following the calendar year containing the
date of termination, the benefits will be made no earlier than the first business day of that following calendar year. The first such cash payment shall include all amounts that otherwise would have been due prior thereto under the terms of this
Agreement had such payments commenced immediately upon the termination of Executive’s employment with the Company, and any payments made after the first such payment shall continue as provided herein. The delayed benefits shall in any event
expire at the time such benefits would have expired had such benefits commenced immediately following the termination of Executive’s employment with the Company. 

(d) The Company makes no representations or warranties and shall have no liability to any Participant or any other person,
other than with respect to payments made by the Company in violation of the provisions of this Plan, if any provisions of or payments under this Plan are determined to constitute deferred compensation subject to Section 409A of the Code but not
to satisfy the conditions of that section. 
 14. Plan Administration. 

(a) Plan Administrator. The Plan Administrator shall be the Board or a committee thereof designated by the Board (the
“Committee”); provided, however, that the Board or such Committee may in its sole discretion appoint a new Plan Administrator to administer the Plan following a Change in Control. The Plan Administrator shall also serve as the Named
Fiduciary of the Plan under ERISA. The Plan Administrator shall be the “administrator” within the meaning of Section 3(16) of ERISA and shall have all the responsibilities and duties contained therein. 

The Plan Administrator can be contacted at the following address: 

3 Clock Tower Place 

Maynard, MA 01754 

  
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 (b) Decisions, Powers and Duties. The general administration of the Plan
and the responsibility for carrying out its provisions shall be vested in the Plan Administrator. The Plan Administrator shall have such powers and authority as are necessary to discharge such duties and responsibilities which also include, but are
not limited to, interpretation and construction of the Plan, the determination of all questions of fact, including, without limit, eligibility, participation and benefits, the resolution of any ambiguities and all other related or incidental
matters, and such duties and powers of the plan administration which are not assumed from time to time by any other appropriate entity, individual or institution. The Plan Administrator may adopt rules and regulations of uniform applicability in its
interpretation and implementation of the Plan. 
 The Plan Administrator shall discharge its duties and responsibilities and exercise its
powers and authority in its sole discretion and in accordance with the terms of the controlling legal documents and applicable law, and its actions and decisions that are not arbitrary and capricious shall be binding on any employee, and
employee’s spouse or other dependent or beneficiary and any other interested parties whether or not in being or under a disability. 

15. Indemnification. To the extent permitted by law, all employees, officers, directors, agents and representatives of the Company
shall be indemnified by the Company and held harmless against any claims and the expenses of defending against such claims, resulting from any action or conduct relating to the administration of the Plan, whether as a member of the Committee or
otherwise, except to the extent that such claims arise from gross negligence, willful neglect, or willful misconduct. 
 16. Plan Not an
Employment Contract. The Plan is not a contract between the Company and any employee, nor is it a condition of employment of any employee. Nothing contained in the Plan gives, or is intended to give, any employee the right to be retained in the
service of the Company, or to interfere with the right of the Company to discharge or terminate the employment of any employee at any time and for any reason. No employee shall have the right or claim to benefits beyond those expressly provided in
this Plan, if any. All rights and claims are limited as set forth in the Plan. 
 17. Severability. In case any one (1) or more
of the provisions of this Plan (or part thereof) shall be held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect the other provisions hereof, and this Plan shall be construed as
if such invalid, illegal or unenforceable provisions (or part thereof) never had been contained herein. 

  
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 18. Non-Assignability. No right or interest of any
Covered Employee in the Plan shall be assignable or transferable in whole or in part either directly or by operation of law or otherwise, including, but not limited to, execution, levy, garnishment, attachment, pledge or bankruptcy. 

19. Integration With Other Pay or Benefits Requirements. The severance payments and benefits provided for in the Plan are the maximum
benefits that the Company will pay to Covered Employees on a Covered Termination, except to the extent otherwise specifically provided in a separate agreement. To the extent that the Company owes any amounts in the nature of severance benefits under
any other program, policy or plan of the Company that is not otherwise superseded by this Plan, or to the extent that any federal, state or local law, including, without limitation, so-called “plant
closing” laws, requires the Company to give advance notice or make a payment of any kind to an employee because of that employee’s involuntary termination due to a layoff, reduction in force, plant or facility closing, sale of business, or
similar event, the benefits provided under this Plan or the other arrangement shall either be reduced or eliminated to avoid any duplication of payment. The Company intends for the benefits provided under this Plan to partially or fully satisfy any
and all statutory obligations that may arise out of an employee’s involuntary termination for the foregoing reasons and the Company shall so construe and implement the terms of the Plan. 

20. Amendment or Termination. The Board may amend, modify, or terminate the Plan at any time in its sole discretion; provided, however,
that (a) any such amendment, modification or termination made prior to a Change in Control (i) that adversely affects the rights of any Covered Employee shall be unanimously approved by the Company’s Board of Directors, including any
independent director(s) and the Chief Executive Officer and (ii) may not be undertaken unless the Company has entered into an Employment Agreement with each Executive (determined as of the date of such amendment, modification or termination)
that provides for severance, change in control or other economic benefits at least as favorable in the aggregate as those provided herein, (b) no such amendment, modification or termination may affect the rights of a Covered Employee then
receiving payments or benefits under the Plan without the consent of such person, and (c) no such amendment, modification or termination made after a Change in Control shall be effective for one (1) year. 

21. Governing Law. The Plan and the rights of all persons under the Plan shall be construed in accordance with and under applicable
provisions of ERISA, and the regulations thereunder, and the laws of the State of Delaware (without regard to conflict of laws provisions) to the extent not preempted by federal law. 

  
 12EX-10.12

 Exhibit 10.12 

STOCK PURCHASE AGREEMENT 

This Stock Purchase Agreement (this “Agreement”) is entered into as of
[                    ], by Acacia Communications, Inc., a Delaware corporation (the “Company”), and
[                    ] (the “Purchaser”). 

SECTION 1. ACQUISITION OF SHARES. 
 (a)
Transfer. On the terms and conditions set forth in this Agreement, the Company agrees to transfer [                    ] Shares to the
Purchaser. The transfer shall occur at the offices of the Company on the date set forth above or at such other place and time as the parties may agree. 

(b) Consideration. The Purchaser agrees to assign to the Company certain intellectual property rights, pursuant to that certain
Technology Assignment Agreement dated as of the date hereof between the Company and the Purchaser (the “Assignment Agreement”), in exchange for the Purchased Shares. The Company and the Purchaser agree that the fair market value of such
consideration is $[        ], or $[        ]per Purchased Share. The Purchase Price is agreed to be at least 100% of the Fair Market Value of the Purchased Shares.
Payment shall be made on the transfer date by execution and delivery of the Assignment Agreement. 
 (c) Defined Terms. Capitalized
terms not defined above are defined in Section 12 of this Agreement. 
 SECTION 2. RIGHT OF REPURCHASE. 

(a) Scope of Repurchase Right. Until they vest in accordance with Subsection (b) below,
[                    ] of the Purchased Shares shall be Restricted Shares and shall be subject to the Company’s Right of Repurchase. The
Company, however, may decline to exercise its Right of Repurchase or may exercise its Right of Repurchase only with respect to a portion of the Restricted Shares. The Company may exercise its Right of Repurchase only during the Repurchase Period
following the termination of the Purchaser’s Service. The Right of Repurchase may be exercised automatically under Subsection (d) below. If the Right of Repurchase is exercised, the Company shall pay the Purchaser an amount equal to the
Purchase Price for each of the Restricted Shares being repurchased. 
 (b) Lapse of Repurchase Right. The Right of Repurchase shall
lapse with respect to [                    ] of the Purchased Shares when the Purchaser completes each month of continuous Service following
[                    ]. In addition, the following rules shall apply if the Company is subject to a Change in Control before the Purchaser’s
Service terminates: 
 (i) At all times after the Change in Control, the vested portion of the Restricted Shares shall be
determined by adding six months to the Purchaser’s actual Service. 
 (ii) If the Purchaser is subject to an Involuntary
Termination after the Change in Control, then the Right of Repurchase shall lapse in full and all Restricted Shares shall become vested. 

 (c) Escrow. If requested by the Company, the certificate(s) for Restricted Shares shall,
upon issuance, be deposited in escrow with the Company to be held in accordance with the provisions of this Agreement. If requested by the Company, any additional or exchanged securities or other property described in Subsection (f) below shall
immediately be delivered to the Company to be held in escrow. All ordinary cash dividends on Restricted Shares (or on other securities held in escrow) shall be paid directly to the Purchaser and shall not be held in escrow. Restricted Shares,
together with any other assets held in escrow under this Agreement, shall be (i) surrendered to the Company for repurchase upon exercise of the Right of Repurchase or the Right of First Refusal or (ii) released to the Purchaser upon his or
her request to the extent that the Shares have ceased to be Restricted Shares (but not more frequently than once every six months). In any event, all Purchased Shares that have ceased to be Restricted Shares, together with any other vested assets
held in escrow under this Agreement, shall be released within 90 days after the earlier of (i) the termination of the Purchaser’s Service or (ii) the lapse of the Right of First Refusal. 

(d) Exercise of Repurchase Right. The Company shall be deemed to have exercised its Right of Repurchase automatically for all
Restricted Shares as of the commencement of the Repurchase Period, unless the Company during the Repurchase Period notifies the holder of the Restricted Shares pursuant to Section 9 that it will not exercise its Right of Repurchase for some or
all of the Restricted Shares. During the Repurchase Period, the Company shall pay to the holder of the Restricted Shares the purchase price determined under Subsection (a) above for the Restricted Shares being repurchased. Payment shall be made
in cash or cash equivalents and/or by canceling indebtedness to the Company incurred by the Purchaser in the purchase of the Restricted Shares. The certificate(s) representing the Restricted Shares being repurchased shall be delivered to the Company
properly endorsed for transfer. 
 (e) Termination of Rights as Stockholder. If the Right of Repurchase is exercised in accordance
with this Section 2 and the Company makes available the consideration for the Restricted Shares being repurchased, then the person from whom the Restricted Shares are repurchased shall no longer have any rights as a holder of the Restricted
Shares (other than the right to receive payment of such consideration). Such Restricted Shares shall be deemed to have been repurchased pursuant to this Section 2, whether or not the certificate(s) for such Restricted Shares have been delivered
to the Company or the consideration for such Restricted Shares has been accepted. 
 (f) Additional or Exchanged Securities and Property.
In the event of a merger or consolidation of the Company with or into another entity, any other corporate reorganization, a stock split, the declaration of a stock dividend, the declaration of an extraordinary dividend payable in a form other
than stock, a spin-off, an adjustment in conversion ratio, a recapitalization or a similar transaction affecting the Company’s outstanding securities, any securities or other property (including cash or cash equivalents) that are by reason of
such transaction exchanged for, or distributed with respect to, any Restricted Shares shall immediately be subject to the Right of Repurchase. Appropriate adjustments to reflect the exchange or distribution of such securities or property shall be
made to the number and/or class of the Restricted Shares. Appropriate adjustments shall also be made to the price per share to be paid upon the exercise of the Right of Repurchase, provided that the aggregate purchase price payable for the
Restricted Shares shall remain the same. In the event of a merger or consolidation of the Company with or into another entity or any other corporate reorganization, the Right of Repurchase may be exercised by the Company’s successor. 

 (g) Transfer of Restricted Shares. The Purchaser shall not transfer, assign, encumber or
otherwise dispose of any Restricted Shares without the Company’s written consent, except as provided in the following sentence. The Purchaser may transfer Restricted Shares to one or more members of the Purchaser’s Immediate Family, to a
trust established by the Purchaser for the benefit of the Purchaser and/or one or more members of the Purchaser’s Immediate Family, provided in either case that the Transferee agrees in writing on a form prescribed by the Company to be bound by
all provisions of this Agreement. If the Purchaser transfers any Restricted Shares, then this Agreement shall apply to the Transferee to the same extent as to the Purchaser. 

(h) Assignment of Repurchase Right. The Board of Directors may freely assign the Company’s Right of Repurchase, in whole or in
part. Any person who accepts an assignment of the Right of Repurchase from the Company shall assume all of the Company’s rights and obligations under this Section 2. 

SECTION 3. RIGHT OF FIRST REFUSAL. 
 (a)
Right of First Refusal. In the event that the Purchaser proposes to sell, pledge or otherwise transfer to a third party any Purchased Shares, or any interest in Purchased Shares, the Company shall have the Right of First Refusal with respect
to all (and not less than all) of such Purchased Shares. If the Purchaser desires to transfer Purchased Shares, the Purchaser shall give a written Transfer Notice to the Company describing fully the proposed transfer, including the number of
Purchased Shares proposed to be transferred, the proposed transfer price, the name and address of the proposed Transferee and proof satisfactory to the Company that the proposed sale or transfer will not violate any applicable federal or state
securities laws. The Transfer Notice shall be signed both by the Purchaser and by the proposed Transferee and must constitute a binding commitment of both parties to the transfer of the Purchased Shares. The Company shall have the right to purchase
all, and not less than all, of the Purchased Shares on the terms of the proposal described in the Transfer Notice (subject, however, to any change in such terms permitted under Subsection (b) below) by delivery of a notice of exercise of the
Right of First Refusal within 30 days after the date when the Transfer Notice was received by the Company. 
 (b) Transfer of Shares.
If the Company fails to exercise its Right of First Refusal within 10 days after receiving the Transfer Notice, the Purchaser may, not later than 90 days after the Company received the Transfer Notice, conclude a transfer of the Purchased Shares
subject to the Transfer Notice on the terms and conditions described in the Transfer Notice, provided that any such sale is made in compliance with applicable federal and state securities laws and not in violation of any other contractual
restrictions to which the Purchaser is bound. Any proposed transfer on terms and conditions different from those described in the Transfer Notice, as well as any subsequent proposed transfer by the Purchaser, shall again be subject to the Right of
First Refusal and shall require compliance with the procedure described in Subsection (a) above. If the Company exercises its Right of First Refusal, the parties shall consummate the sale of the Purchased Shares on the terms set forth in the
Transfer Notice within 60 days after the Company received the Transfer Notice (or within such longer period as may have been specified in the Transfer Notice); provided, however, that in the event the Transfer Notice provided that payment

 
for the Purchased Shares was to be made in a form other than cash or cash equivalents paid at the time of transfer, the Company shall have the option of paying for the Purchased Shares with cash
or cash equivalents equal to the present value of the consideration described in the Transfer Notice. 
 (c) Additional or Exchanged
Securities and Property. In the event of a merger or consolidation of the Company with or into another entity, any other corporate reorganization, a stock split, the declaration of a stock dividend, the declaration of an extraordinary dividend
payable in a form other than stock, a spin-off, an adjustment in conversion ratio, a recapitalization or a similar transaction affecting the Company’s outstanding securities, any securities or other property (including cash or cash equivalents)
that are by reason of such transaction exchanged for, or distributed with respect to, any Purchased Shares subject to this Section 3 shall immediately be subject to the Right of First Refusal. Appropriate adjustments to reflect the exchange or
distribution of such securities or property shall be made to the number and/or class of the Purchased Shares subject to this Section 3. 

(d) Termination of Right of First Refusal. Any other provision of this Section 3 notwithstanding, in the event that the Stock is
readily tradable on an established securities market when the Purchaser desires to transfer Purchased Shares, the Company shall have no Right of First Refusal, and the Purchaser shall have no obligation to comply with the procedures prescribed by
Subsections (a) and (b) above. 
 (e) Permitted Transfers. This Section 3 shall not apply to (i) a transfer by
beneficiary designation, will or intestate succession or (ii) a transfer to one or more members of the Purchaser’s Immediate Family or to a trust established by the Purchaser for the benefit of the Purchaser and/or one or more members of
the Purchaser’s Immediate Family. If the Purchaser transfers any Purchased Shares, either under this Subsection (e) or after the Company has failed to exercise the Right of First Refusal, then this Agreement shall apply to the Transferee
to the same extent as to the Purchaser. 
 (f) Termination of Rights as Stockholder. If the Company makes available, at the time and
place and in the amount and form provided in this Agreement, the consideration for the Shares to be purchased in accordance with this Section 3, then after such time the person from whom such Shares are to be purchased shall no longer have any
rights as a holder of such Shares (other than the right to receive payment of such consideration in accordance with this Agreement). Such Shares shall be deemed to have been purchased in accordance with the applicable provisions hereof, whether or
not the certificate(s) therefor have been delivered as required by this Agreement. 
 (g) Assignment of Right of First Refusal. The
Board of Directors may freely assign the Company’s Right of First Refusal, in whole or in part. Any person who accepts an assignment of the Right of First Refusal from the Company shall assume all of the Company’s rights and obligations
under this Section 3. 

 SECTION 4. OTHER RESTRICTIONS ON TRANSFER. 

(a) Purchaser Representations. In connection with the issuance and acquisition of Shares under this Agreement, the Purchaser hereby
represents and warrants to the Company as follows: 
 (i) The Purchaser is acquiring and will hold the Purchased Shares for
investment for his or her account only and not with a view to, or for resale in connection with, any “distribution” thereof within the meaning of the Securities Act. 

(ii) The Purchaser understands that the Purchased Shares have not been registered under the Securities Act by reason of a
specific exemption therefrom and that the Purchased Shares must be held indefinitely, unless they are subsequently registered under the Securities Act or the Purchaser obtains an opinion of counsel, in form and substance satisfactory to the Company
and its counsel, that such registration is not required. The Purchaser further acknowledges and understands that the Company is under no obligation to register the Purchased Shares. 

(iii) The Purchaser is aware of the adoption of Rule 144 by the Securities and Exchange Commission under the Securities Act,
which permits limited public resales of securities acquired in a non-public offering, subject to the satisfaction of certain conditions, including (without limitation) the availability of certain current public information about the issuer, the
resale occurring only after the holding period required by Rule 144 has been satisfied, the sale occurring through an unsolicited “broker’s transaction,” and the amount of securities being sold during any three-month period not
exceeding specified limitations. The Purchaser acknowledges and understands that the conditions for resale set form in Rule 144 have not been satisfied and that the Company has no plans to satisfy these conditions in the foreseeable future. 

(iv) The Purchaser will not sell, transfer or otherwise dispose of the Purchased Shares in violation of the Securities Act, the
Securities Exchange Act of 1934, or the rules promulgated thereunder, including Rule 144 under the Securities Act. The Purchaser agrees that he or she will not dispose of the Purchased Shares unless and until he or she has complied with all
requirements of this Agreement applicable to the disposition of Purchased Shares and he or she has provided the Company with written assurances, in substance and form satisfactory to the Company, that (A) the proposed disposition does not
require registration of the Purchased Shares under the Securities Act or all appropriate action necessary for compliance with the registration requirements of the Securities Act or with any exemption from registration available under the Securities
Act (including Rule 144) has been taken and (B) the proposed disposition will not result in the contravention of any transfer restrictions applicable to the Purchased Shares under state securities law. 

(v) The Purchaser has been furnished with, and has had access to, such information as he or she considers necessary or
appropriate for deciding whether to invest in the Purchased Shares, and the Purchaser has had an opportunity to ask questions and receive answers from the Company regarding the terms and conditions of the issuance of the Purchased Shares. 

 (vi) The Purchaser is aware that his or her investment in the Company is a
speculative investment that has limited liquidity and is subject to the risk of complete loss. The Purchaser is able, without impairing his or her financial condition, to hold the Purchased Shares for an indefinite period and to suffer a complete
loss of his or her investment in the Purchased Shares. 
 (b) Securities Law Restrictions. Regardless of whether the offering and
sale of Shares under this Agreement have been registered under the Securities Act or have been registered or qualified under the securities laws of any state, the Company at its discretion may impose restrictions upon the sale, pledge or other
transfer of the Purchased Shares (including the placement of appropriate legends on stock certificates or the imposition of stop-transfer instructions) if, in the judgment of the Company, such restrictions are necessary or desirable in order to
achieve compliance with the Securities Act, the securities laws of any state or any other law. 
 (c) Market Stand-Off. In connection
with any underwritten public offering by the Company of its equity securities pursuant to an effective registration statement filed under the Securities Act, including the Company’s initial public offering, the Purchaser shall not directly or
indirectly sell, make any short sale of, loan, hypothecate, pledge, offer, grant or sell any option or other contract for the purchase of, purchase any option or other contract for the sale of, or otherwise dispose of or transfer, or agree to engage
in any of the foregoing transactions with respect to, any Purchased Shares without the prior written consent of the Company or its underwriters. Such restriction (the “Market Stand-Off”) shall be in effect for such period of time following
the date of the final prospectus for the offering as may be requested by the Company or such underwriters. In no event, however, shall such period exceed 180 days. The Market Stand-Off shall in any event terminate two years after the date of the
Company’s initial public offering. In the event of the declaration of a stock dividend, a spin-off, a stock split, an adjustment in conversion ratio, a recapitalization or a similar transaction affecting the Company’s outstanding
securities without receipt of consideration, any new, substituted or additional securities which are by reason of such transaction distributed with respect to any Shares subject to the Market Stand-Off, or into which such Shares thereby become
convertible, shall immediately be subject to the Market Stand-Off. In order to enforce the Market Stand-Off, the Company may impose stop-transfer instructions with respect to the Purchased Shares until the end of the applicable stand-off period. The
Company’s underwriters shall be beneficiaries of the agreement set forth in this Subsection (c). This Subsection (c) shall not apply to Shares registered in the public offering under the Securities Act, and the Purchaser shall be subject
to this Subsection (c) only if the directors and officers of the Company are subject to similar arrangements. 
 (d) Rights of the
Company. The Company shall not be required to (i) transfer on its books any Purchased Shares that have been sold or transferred in contravention of this Agreement or (ii) treat as the owner of Purchased Shares, or otherwise to accord
voting, dividend or liquidation rights to, any transferee to whom Purchased Shares have been transferred in contravention of this Agreement. 

 SECTION 5. SUCCESSORS AND ASSIGNS. 

Except as otherwise expressly provided to the contrary, the provisions of this Agreement shall inure to the benefit of, and be binding upon,
the Company and its successors and assigns and be binding upon the Purchaser and the Purchaser’s legal representatives, heirs, legatees, distributees, assigns and transferees by operation of law, whether or not any such person has become a
party to this Agreement or has agreed in writing to join herein and to be bound by the terms, conditions and restrictions hereof. 
 SECTION 6. NO
RETENTION RIGHTS. 
 Nothing in this Agreement shall confer upon the Purchaser any right to continue in Service for any period of
specific duration or interfere with or otherwise restrict in any way the rights of the Company (or any Parent or Subsidiary employing or retaining the Purchaser) or of the Purchaser, which rights are hereby expressly reserved by each, to terminate
his or her Service at any time and for any reason, with or without cause. 
 SECTION 7. TAX ELECTION. 

The acquisition of the Purchased Shares may result in adverse tax consequences that may be avoided or mitigated by filing an election under
Code Section 83(b). Such election may be filed only within 30 days after the date of purchase. The form for making the Code Section 83(b) election is attached to this Agreement as Exhibit I. The Purchaser should consult with his tax
advisor to determine the tax consequences of acquiring the Purchased Shares and the advantages and disadvantages of filing the Code Section 83(b) election. The Purchaser acknowledges that it is his or her sole responsibility, and not the
Company’s, to file a timely election under Code Section 83(b), even if the Purchaser requests the Company or its representatives to make this filing on his or her behalf. 

SECTION 8. LEGENDS. 
 All certificates
evidencing Purchased Shares shall bear the following legends: 
 “THE SHARES REPRESENTED HEREBY MAY NOT BE SOLD, ASSIGNED, TRANSFERRED,
ENCUMBERED OR IN ANY MANNER DISPOSED OF, EXCEPT IN COMPLIANCE WITH THE TERMS OF A WRITTEN AGREEMENT BETWEEN THE COMPANY AND THE REGISTERED HOLDER OF THE SHARES (OR THE PREDECESSOR IN INTEREST TO THE SHARES). SUCH AGREEMENT GRANTS TO THE COMPANY
CERTAIN RIGHTS OF FIRST REFUSAL UPON AN ATTEMPTED TRANSFER OF THE SHARES AND CERTAIN REPURCHASE RIGHTS UPON TERMINATION OF SERVICE WITH THE COMPANY. THE SECRETARY OF THE COMPANY WILL UPON WRITTEN REQUEST FURNISH A COPY OF SUCH AGREEMENT TO THE
HOLDER HEREOF WITHOUT CHARGE.” 
 “THE SHARES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED, AND MAY NOT BE SOLD, PLEDGED, OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT OR AN OPINION OF COUNSEL, SATISFACTORY TO THE COMPANY AND ITS COUNSEL, THAT SUCH REGISTRATION IS NOT REQUIRED.” 

 If required by the authorities of any state in connection with the issuance of the Purchased Shares, the legend
or legends required by such state authorities shall also be endorsed on all such certificates. 
 SECTION 9. NOTICE. 

Any notice required by the terms of this Agreement shall be given in writing. It shall be deemed effective upon (i) personal delivery or
(ii) deposit with the United States Postal Service, by registered or certified mail, with postage and fees prepaid. Notice shall be addressed to the Company at its principal executive office and to the Purchaser at the address that he or she
most recently provided to the Company in accordance with this Section 9. 
 SECTION 10. ENTIRE AGREEMENT. 

This Agreement constitutes the entire contract between the parties hereto with regard to the subject matter hereof. It supersedes any other
agreements, representations or understandings (whether oral or written and whether express or implied) which relate to the subject matter hereof. 

SECTION 11. CHOICE OF LAW. 
 This
Agreement shall be governed by, and construed in accordance with, the laws of the State of Delaware, as such laws are applied to contracts entered into and performed in such State. 

SECTION 12. DEFINITIONS. 
 (a)
“Agreement” shall mean this Stock Purchase Agreement. 
 (b) “Board of Directors” shall mean the Board of
Directors of the Company, as constituted from time to time. 
 (c) “Cause” shall mean a good faith determination by the
Board of Directors of any of the following: 
 (i) An unauthorized use or disclosure by the Purchaser of the Company’s
confidential information or trade secrets, which use or disclosure causes material harm to the Company; 
 (ii) A material
breach by the Purchaser of any material agreement between the Purchaser and the Company; 
 (iii) A material failure by the
Purchaser to comply with the Company’s written policies or rules after receiving written notification of such failure from the Board of Directors; 

(iv) The Purchaser’s conviction of, or plea of “guilty” or “no contest” to, a felony under the laws of
the United States or any state thereof; 

 (v) The Purchaser’s gross negligence or willful misconduct in the course of
performing Service; 
 (vi) A continuing failure by the Purchaser to perform reasonably assigned duties after receiving
written notification of such failure from the Board of Directors; or (viii) A failure by the Purchaser to cooperate in good faith with a governmental or internal investigation of the Company or its directors, officers or employees, if the
Company has requested the Purchaser’s cooperation. 
 (d) “Change in Control” shall mean (i) the consummation of
a merger or consolidation of the Company with or into another entity or (ii) the sale, transfer or other disposition of all or substantially all of the Company’s assets. The foregoing notwithstanding, a merger or consolidation of the
Company shall not constitute a “Change in Control” if immediately after such merger or consolidation a majority of the voting power of the capital stock of the continuing or surviving entity, or any direct or indirect parent corporation of
such continuing or surviving entity, will be owned by persons who were the Company’s stockholders immediately prior to such merger or consolidation in substantially the same proportions as their ownership of the voting power of the
Company’s capital stock immediately prior to such merger or consolidation. 
 (e) “Code” shall mean the Internal
Revenue Code of 1986, as amended. 
 (f) “Consultant” shall mean a person who performs bona fide services for the Company,
a Parent or a Subsidiary as a consultant or advisor, excluding Employees and members of the Board of Directors. 
 (g)
“Employee” shall mean any individual who is a common-law employee of the Company, a Parent or a Subsidiary. 
 (h)
“Fair Market Value” shall mean the fair market value of a Share, as determined by the Board of Directors in good faith. Such determination shall be conclusive and binding on all persons. 

(i) “Immediate Family” shall mean any child, stepchild, grandchild, parent, stepparent, grandparent, spouse, sibling,
mother-in-law, father-in-law, son-in-law, daughter-in-law, brother-in-law or sister-in-law and shall include adoptive relationships. 
 (j)
“Involuntary Termination” shall mean the termination of the Purchaser’s Service by reason of: 
  

	 	(i)	The involuntary discharge of the Purchaser by the Company (or the Parent or Subsidiary employing him) for reasons other than Cause; or 

 

	 	(ii)	 The voluntary resignation of the Purchaser following any of the following events, if such event occurs without the consent of the Purchaser:
(A) a change in the Purchaser’s position with the Company (or the Parent or Subsidiary employing him or her) that 

	 	
materially reduces his or her level of authority or responsibility (provided that the Purchaser’s level of authority or responsibility shall not be deemed to be reduced merely because there
are additional employees more senior to the Purchaser as a result of the Change in Control), (B) a reduction in the Purchaser’s base salary by more than 10%, unless such reduction is made in connection with a commensurate reduction in the
compensation of employees of the Company generally, or (C) receipt of notice that the Purchaser’s principal workplace will be relocated more than 50 miles. 

(k) “Parent” shall mean any corporation (other than the Company) in an unbroken chain of corporations ending with the
Company, if each of the corporations other than the Company owns stock possessing 50% or more of the total combined voting power of all classes of stock in one of the other corporations in such chain. 

(l) “Purchased Shares” shall mean the Shares purchased by the Purchaser pursuant to this Agreement. 

(m) “Purchase Price” shall mean the dollar value for which one Share may be purchased pursuant to this Agreement, as
specified in Section 1(b). 
 (n) “Repurchase Period” shall mean a period of 180 consecutive days commencing on the
date when the Purchaser’s Service terminates for any reason, including (without limitation) death or disability. 
 (o)
“Restricted Share” shall mean a Purchased Share that is subject to the Right of Repurchase. 
 (p) “Right of First
Refusal” shall mean the Company’s right of first refusal described in Section 3. 
 (q) “Right of
Repurchase” shall mean the Company’s right of repurchase described in Section 2. 
 (r) “Securities Act”
shall mean the Securities Act of 1933, as amended. 
 (s) “Service” shall mean service as an Employee, Consultant or member
of the Board of Directors. 
 (t) “Share” shall mean one share of Stock. 

(u) “Stock” shall mean the Common Stock of the Company, with a par value of $0.0001 per Share. 

(v) “Subsidiary” shall mean any corporation (other than the Company) in an unbroken chain of corporations beginning with the
Company, if each of the corporations other than the last corporation in the unbroken chain owns stock possessing 50% or more of the total combined voting power of all classes of stock in one of the other corporations in such chain. 

 (w) “Transferee” shall mean any person to whom the Purchaser has directly or
indirectly transferred any Purchased Share. 
 (x) “Transfer Notice” shall mean the notice of a proposed transfer of
Purchased Shares described in Section 3. 
 IN WITNESS WHEREOF each of the parties has executed this Agreement, in the case of the Company
by its duly authorized officer, as of the day and year first above written. 
  

			
	PURCHASER:
	
	  

	
	COMPANY:
	
	ACACIA COMMUNICATIONS, INC.
	
	  

		
	By:	 	
	Name:	 	
	Title:	 	President

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