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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1651235	Acacia Communications Inc.	ACIA	Semiconductors & Related Devices (3674)	270291921

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1659714	Murugesan Shanmugaraj	C/O Acacia Communications, Inc. Three Mill And Main Place, Suite 400 Maynard MA 01754	President & Ceo	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2019-02-14	2,669	$43.38	729,172	No	4	S	Direct
Common Stock	Acquisiton	2019-02-14	25,334	$0.00	754,506	No	4	A	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct
No	4	A	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	178,960	Indirect	By The Shanmugaraj Irrevocable Children's Trust
Common Stock	164,297	Indirect	By The Malini Shanmugaraj 2016 QTIP Trust

Footnotes

The sales reported were used to pay tax withholding in connection with the vesting of restricted stock units ("RSUs").
Includes 96,523 RSUs. Each RSU represents the right to receive one share of common stock upon vesting.
Consists of 25,334 RSUs. Each RSU represents the right to receive one share of common stock upon vesting. The RSUs will vest as to 25% of the original number of shares on each of February 1, 2020, February 1, 2021, February 1, 2022, and February 1, 2023.
Includes 121,857 RSUs (including the 25,334 RSUs described in footnote 3). Each RSU represents the right to receive one share of common stock upon vesting.