FORM 4
[ X ] 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 *

Commonwealth Capital Ventures IV L P 		2. Issuer Name and Ticker or Trading Symbol

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

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

400 WEST CUMMINGS PARK, SUITE 1725-134 		3. Date of Earliest Transaction (MM/DD/YYYY)

5/22/2017
(Street)

WOBURN, MA 01801
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

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

___ Form filed by One Reporting Person
_ X _ 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   5/22/2017     J (1) (2)    400000   D   (1) (2) 3750915   D   (3)  

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

Explanation of Responses:
(1)  On May 22, 2017, Commonwealth Capital Ventures IV L.P. ("CCV IV") distributed, for no consideration, all 400,000 shares of the Issuer's Common Stock pro-rata to its partners, including its limited partners and its general partner, Commonwealth Venture (GP) Partners IV L.P. ("GP IV LP"), in accordance with the exemptions afforded by Rule 16a-9 and Rule 16a-13 of the Securities Exchange Act of 1934, as amended (the "Act").
(2)  Immediately following the distribution by CCV IV on the same date, GP IV LP distributed, for no consideration, the shares it received in the distribution by CCV IV to its limited partners, representing each such partner's pro rata interest in such shares, in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Act.
(3)  Each of GP IV LP and Commonwealth Venture (GP) Partners IV LLC ("GP IV LLC"), its general partner, disclaims beneficial ownership of the shares except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that it is the beneficial owner of such shares.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Commonwealth Capital Ventures IV L P
400 WEST CUMMINGS PARK
SUITE 1725-134
WOBURN, MA 01801
X

Commonwealth Venture (GP) Partners IV LP
400 WEST CUMMINGS PARK
SUITE 1725-134
WOBURN, MA 01801
X

Commonwealth Venture (GP) Partners IV LLC
400 WEST CUMMINGS PARK
SUITE 1725-134
WOBURN, MA 01801
X


Signatures
Commonwealth Capital Ventures IV L.P., By: Commonwealth Venture (GP) Partners IV L.P., its general partner, By: Commonwealth Venture (GP) Partners IV LLC, its general partner, By: /s/ Elliot Katzman, Manager 5/24/2017
** Signature of Reporting Person Date

Commonwealth Venture (GP) Partners IV L.P., By: Commonwealth Venture (GP) Partners IV LLC, its general partner, By: /s/ Elliot Katzman, Manager 5/24/2017
** Signature of Reporting Person Date

Commonwealth Venture (GP) Partners IV LLC, By: /s/ Elliot Katzman, Manager 5/24/2017
** 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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