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
                                                                                  
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response...
0.5                       
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 *

Rasmussen Christian 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)
VP Digital Signal Proc&Optics
(Last)          (First)          (Middle)

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

2/2/2021
(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 2/2/2021  S  5306 (1)D$114.45 530984 (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 Security3. Trans. Date3A. Deemed Execution Date, if any4. 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 Date7. 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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares

Explanation of Responses:
(1) The sales reported were used to pay tax withholding in connection with the vesting of restricted stock units ("RSUs").
(2) Includes 19,235 RSUs. Each RSU represents the right to receive the one share of common stock upon vesting.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
Rasmussen Christian J.
C/O ACACIA COMMUNICATIONS, INC.
THREE MILL AND MAIN PLACE, SUITE 400
MAYNARD, MA 01754


VP Digital Signal Proc&Optics

Signatures
/s/ Janene I. Asgeirsson, attorney-in-fact2/4/2021
**Signature of Reporting PersonDate

Acacia Communications (NASDAQ:ACIA)
Historical Stock Chart
From Feb 2024 to Mar 2024 Click Here for more Acacia Communications Charts.
Acacia Communications (NASDAQ:ACIA)
Historical Stock Chart
From Mar 2023 to Mar 2024 Click Here for more Acacia Communications Charts.