FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Murphy Francis J 		2. Issuer Name and Ticker or Trading Symbol

Acacia Communications, Inc. [ ACIA ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
Corporate Controller
(Last)          (First)          (Middle)

C/O ACACIA COMMUNICATIONS, INC., THREE MILL AND MAIN PLACE, SUITE 400 		3. Date of Earliest Transaction (MM/DD/YYYY)

1/3/2017
(Street)

MAYNARD, MA 01754
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock   1/3/2017     M    1333   (1) A $1.67   51465   (2) D    
Common Stock   1/3/2017     M    334   (1) A $2.09   51799   (2) D    
Common Stock   1/3/2017     M    1667   (1) A $4.18   53466   (2) D    
Common Stock   1/3/2017     S    6752   D $62.15   46714   (2) D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (right to buy)   $1.67   1/3/2017     M         1333      (3) 12/17/2023   Common Stock   1333   $0.00   7667   D    
Stock Option (right to buy)   $2.09   1/3/2017     M         334      (4) 3/21/2024   Common Stock   334   $0.00   2250   D    
Stock Option (right to buy)   $4.18   1/3/2017     M         1667      (5) 3/28/2025   Common Stock   1667   $0.00   11250   D    

Explanation of Responses:
( 1)  Shares of common stock acquired upon the exercise of outstanding stock options.
( 2)  Includes 30,000 restricted stock units ("RSUs"). Each RSU represents the right to receive one share of common stock upon vesting.
( 3)  This option, representing a right to purchase a total of 20,000 shares, vested as to 20% of the shares on November 25, 2014, and vests in equal monthly installments thereafter until November 25, 2018.
( 4)  This option, representing a right to purchase a total of 5,000 shares, vested as to 20% of the shares on March 21, 2015, and vests in equal monthly installments thereafter until March 21, 2019.
( 5)  This option, representing a right to purchase a total of 20,000 shares, vested as to 25% of the shares on March 28, 2016, and vests in equal monthly installments thereafter until March 28, 2019.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Murphy Francis J
C/O ACACIA COMMUNICATIONS, INC.
THREE MILL AND MAIN PLACE, SUITE 400
MAYNARD, MA 01754

Corporate Controller

Signatures
/s/ Janene I. Asgeirsson, attorney-in-fact 1/5/2017
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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