Unaudited Financial Outlook for the Third Quarter of 2016

Based on preliminary unaudited information and estimates of the management of Acacia Communications, Inc. (the “Company”) for the three months ending September 30, 2016, and subject to the completion of the 2016 third quarter and its financial closing procedures, in the three months ending September 30, 2016, the Company expects revenue of $127 million to $131 million, GAAP net income of $23 million to $27 million, non-GAAP net income of $29 million to $33 million, GAAP diluted earnings per share of $0.58 to $0.67 and non-GAAP diluted earnings per share of $0.72 to $0.81.