SEC FORM 3

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SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Fisher Eric L

(Last)

(First)

(Middle)

C/O ACACIA COMMUNICATIONS, INC.

3 MILL AND MAIN PLACE, SUITE 400

(Street)

MAYNARD

01754

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
03/28/2019

3. Issuer Name and Ticker or Trading Symbol
Acacia Communications, Inc. [ ACIA ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	VP of Global Sales

5. If Amendment, Date of Original Filed (Month/Day/Year)

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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	65,109⁽¹⁾	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)

Explanation of Responses:

1. Includes 60,608 restricted stock units ("RSUs") under three RSU awards. Each RSU represents the right to receive one share of common stock upon vesting. The first award of 37,147 RSUs vested as to 9,286 shares on July 5, 2018, with the remainder vesting in equal installments of 25% of the original amount on each one-year anniversary thereafter, and will become fully vested on July 5, 2021. The second award of 22,552 RSUs vested as to 5,638 shares on February 1, 2019, with the remainder vesting in equal installments of 25% of the original amount on each one-year anniversary thereafter, and will become fully vested on February 1, 2022. The third award of 15,833 RSUs will vest as to 25% on February 1, 2020, with the remainder vesting in equal installments on each one-year anniversary thereafter, and will become fully vested on February 1, 2023. Includes 377 shares of common stock acquired under the registrant's employee stock purchase plan on November 14, 2018.

Remarks:

Exhibit List - Exhibit 24 - Power of Attorney

	/s/ Janene I. Asgeirsson, attorney-in-fact	04/02/2019
	** 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 5 (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 Number.