Item 3.01.   Notice of Delisting or Failure to Satisfy a Continued Listing Rule
or Standard; Transfer of Listing.
On January 4, 2021, Acacia Communications, Inc. (the "Company") received a
letter from the Listing Qualifications Staff of The Nasdaq Stock Market LLC
("Nasdaq"), which stated that the Company no longer complies with Nasdaq's
continued listing rules due to the Company not having held an annual meeting
within 12 months of the Company's fiscal year ended December 31, 2019, as
required by Nasdaq Listing Rule 5620(a) (the "Listing Rule"). In accordance with
Nasdaq Listing Rule 5810(c)(2)(G), the Company has 45 calendar days to submit a
plan to regain compliance and, if the plan is accepted by Nasdaq, Nasdaq may
grant the Company an exception of up to 180 calendar days from its most recent
fiscal year end, or until June 30, 2021, to regain compliance with the Listing
Rule.
On January 8, 2021, the Company provided Nasdaq with a plan stating that the
Company plans to hold an annual meeting of shareholders on or before May 31,
2021. There can be no assurance that Nasdaq will accept the Company's plan, that
Nasdaq will grant the Company any exception or that the Company will be able to
regain compliance with the Listing Rule or maintain compliance with any other
Nasdaq requirement in the future. In the event the Company's plan is not
accepted by Nasdaq or the Company does not regain compliance with the Listing
Rule by any extension that may be potentially granted by Nasdaq pursuant to an
exception, the Company will receive written notification from Nasdaq that the
Company's securities are subject to delisting. At that time, the Company may
appeal the relevant delisting determination to a hearings panel. However, there
can be no assurance that, if the Company does appeal the delisting determination
by Nasdaq to the panel, that such appeal would be successful.

Safe Harbor for Forward-Looking Statements This Current Report on Form 8-K includes statements concerning the Company and its future expectations, plans and prospects that constitute "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. For this purpose, any statements contained herein that are not statements of historical fact may be deemed to be forward-looking statements. Without limiting the foregoing, the words "may," "should," "would," "expects," "plans," "anticipates," "could," "intends," "target," "projects," "contemplates," "believes," "estimates," "predicts," "potential," "will" or "continue" or the negative of these terms or other similar expressions are intended to help you identify forward-looking statements. The events and circumstances reflected in the forward-looking statements may not be achieved or occur and actual results could differ materially from those projected in the forward-looking statements. These forward-looking statements speak only as of the date of this Current Report on Form 8-K and are subject to a number of risks, uncertainties and assumptions including, without limitation, the Company's ability, and related plan, to regain compliance with Nasdaq's Listing Rule or maintain its listing on the Nasdaq Global Select Market, the potential impacts on the Company's business, results of operations and financial condition as a result of the previously disclosed termination of the prior agreement and plan of merger among the Company, Cisco Systems, Inc. and Amarone Acquisition Corp. or any challenges to such termination, and other risks set forth under the caption "Risk Factors" in the Company's public reports filed with the Securities and Exchange Commission ("SEC"), including the Company's Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2020 filed with the SEC and in other filings that the Company may make with the SEC from time to time. Because forward-looking statements are inherently subject to risks and uncertainties, some of which cannot be predicted or quantified, you should not rely on these forward-looking statements as indicative of future events. The Company assumes no obligation to update any forward-looking statements contained in this Current Report on Form 8-K as a result of new information, future events or otherwise.

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