Sec Form 4 Filing - Rasmussen Christian J. @ Acacia Communications, Inc. - 2016-10-12

Insider filing report for Changes in Beneficial Ownership
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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
Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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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/YY)
10/12/2016
(Street)
MAYNARD, MA01754
4. If Amendment, Date Original Filed (MM/DD/YY)
6. Individual or Joint/Group Filing (Check Applicable Line)
__ X __ Form filed by One Reporting Person
_____ Form filed by More than One Reporting Person
(City) (State) (Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction 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 10/12/2016 F( 1 ) 24,415 D $ 88.46 1,006,948 ( 2 ) D
Common Stock 10/13/2016 S( 3 ) 98,846 D $ 96.5 908,102 ( 4 ) D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction 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
(MM/DD/YY)
7. Title and Amount of Underlying Securities
(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
Reporting Owners
Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Rasmussen Christian J.
C/O ACACIA COMMUNICATIONS, INC.
THREE MILL AND MAIN PLACE, SUITE 400
MAYNARD, MA01754
VP Digital Signal Proc&Optics
Signatures
/s/ Janene I. Asgeirsson, attorney-in-fact 10/14/2016
Signature of Reporting Person Date
Explanation of Responses:
( 1 )Represents shares of common stock that have been withheld by the Company to satisfy its income tax withholding obligations in connection withthe vesting of restricted stock units ("RSUs") that were previously reported by the Reporting Person and does not represent a sale by theReporting Person. Each RSU represents the right to receive one share of common stock upon vesting.
( 2 )Consists of 883,775 shares of common stock and 123,173 RSUs.
( 3 )The sale transaction reported on this Form 4 was effected as part of an underwritten public offering of common stock of the Company in which the Reporting Person was a selling stockholder.
( 4 )Consists of 784,929 shares of common stock and 123,173 RSUs.

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).

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