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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
1657394	J Stan Reiss	C/O Matrix Partners Viii, L.p. 101 Main Street, 17Th Floor Cambridge MA 02142		Yes	No	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	2016-10-13	1,445,307	$96.50	10,646,247	No	4	S	Indirect	By Matrix Partners VIII, L.P.
Common Stock	Disposition	2016-10-13	797	$96.50	5,869	No	4	S	Indirect	By Weston & Co. VIII LLC

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	By Matrix Partners VIII, L.P.
No	4	S	Indirect	By Weston & Co. VIII LLC

Footnotes

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 was a selling stockholder.
Mr. Reiss is a managing member of Matrix VIII US Management Co., LLC ("Matrix VIII US MC"), which is the sole general partner of Matrix Partners VIII, L.P. ("Matrix VIII"). Mr. Reiss, by virtue of his management position in Matrix VIII US MC, has sole voting and dispositive power with respect to these shares. Mr. Reiss, a member of the board of directors of the Company, disclaims beneficial ownership of these shares, except to the extent of his pecuniary interest therein.
These shares are held by Weston & Co. VIII LLC, as nominee for Matrix VIII US MC, which is the beneficial owner of such shares. Matrix VIII US MC is the sole general partner of Matrix VIII.