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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	2016-10-12	21,953	$88.46	850,610	No	4	F	Direct
Common Stock	Disposition	2016-10-13	93,500	$96.50	757,110	No	4	S	Direct
Common Stock	Disposition	2016-10-13	14,663	$96.50	185,337	No	4	S	Indirect	By The Malini Shanmugaraj 2016 QTIP Trust

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	F	Direct
No	4	S	Direct
No	4	S	Indirect	By The Malini Shanmugaraj 2016 QTIP Trust

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	200,000	Indirect	By The Shanmugaraj Irrevocable Children's Trust

Footnotes

Represents shares of common stock that have been withheld by the Company to satisfy its income tax withholding obligations in connection with the vesting of restricted stock units ("RSUs") that were previously reported by the Reporting Person and does not represent a sale by the Reporting Person. Each RSU represents the right to receive one share of common stock uponvesting.
Consists of 717,437 shares of common stock and 133,173 RSUs.
The sale transactions reported on this Form 4 were effected as part of an underwritten public offering of common stock of the Company in which the Reporting Person and The Malini Shanmugaraj 2016 QTIP Trust were selling stockholders.
Consists of 623,937 shares of common stock and 133,173 RSUs.