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 *

Reiss Stan J 		2. Issuer Name and Ticker or Trading Symbol

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

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

C/O MATRIX PARTNERS VIII, L.P., 101 MAIN STREET, 17TH FLOOR 		3. Date of Earliest Transaction (MM/DD/YYYY)

8/24/2018
(Street)

CAMBRIDGE, MA 02142
(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   8/24/2018     J (1)    1000000   D $0.00   6646247   I   By Matrix Partners VIII, L.P.   (2)
Common Stock   8/24/2018     J (3)    551   D $0.00   3665   I   By Weston & Co. VIII LLC   (4)
Common Stock   8/24/2018     J (3)    551   A $0.00   14996   I   By Matrix VIII US Management Co., L.L.C.  
Common Stock   8/24/2018     J (5)    299363   A $0.00   314359   I   By Matrix VIII US Management Co., L.L.C.  
Common Stock   8/24/2018     J (6)    295123   D $0.00   19236   I   By Matrix VIII US Management Co., L.L.C.  
Common Stock   8/24/2018     J (6)    2500   A $0.00   10036   I   By The Reiss Family Irrevocable Trust   (7)
Common Stock   8/24/2018     J (8)    19495   A $0.00   88862   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

Explanation of Responses:
(1)  Represents a pro-rata distribution, and not a purchase or sale, without additional consideration by Matrix Partners VIII, L.P. ("Matrix Partners VIII"), to its partners.
(2)  The shares are owned directly by Matrix Partners VIII. Matrix VIII US Management Co., L.L.C. ( "Matrix VIII US Management Co.") is the General Partner of Matrix Partners VIII and disclaims beneficial ownership of the shares owned by Matrix Partners VIII except to its proportionate pecuniary interest therein. Mr. Reiss, a member of the Board of Directors of the Issuer and a managing member of Matrix VIII US Management Co. has sole voting and dispositive power with respect to these shares. Mr. Reiss disclaims beneficial ownership of such shares, except to the extent of his pecuniary interest therein.
(3)  Re-registration of shares by Weston & Co. VIII L.L.C. ("Weston VIII"), without consideration, in the name of Matrix VIII US Management Co., L.L.C., the beneficial owner of those shares.
(4)  Matrix VIII US Management Co. is the beneficial owner of the shares reported herein as being held of record by Weston VIII, and disclaims beneficial ownership of the shares owned by Weston VIII except to its proportionate pecuniary interest therein. Mr. Reiss, a member of the Board of Directors of the Issuer and a managing member of Matrix VIII US Management Co. has sole voting and dispositive power with respect to these shares. Mr. Reiss disclaims beneficial ownership of such shares, except to the extent of his pecuniary interest therein.
(5)  Represents the shares received in connection with the pro-rata distribution by Matrix Partners VIII, without consideration to its partners.
(6)  Represents pro-rata distribution by Matrix VIII US Management Co., without consideration, to its members.
(7)  Shares held by The Reiss Family Irrevocable Trust. The reporting person is a trustee and beneficiary of the trust.
(8)  Represents the shares received in connection with the pro-rata distribution by Matrix Partners VIII and Matrix VIII US Management, Co., each without consideration, as described in this Form 4.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Reiss Stan J
C/O MATRIX PARTNERS VIII, L.P.
101 MAIN STREET, 17TH FLOOR
CAMBRIDGE, MA 02142 		X



Signatures
/s/ Stan Reiss 8/28/2018
** 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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