Pursuant to Section 13 or 15(d)
of the Securities Exchange Act of 1934
Date of Report (Date of earliest event reported): January 4, 2021
Acacia Communications, Inc.
(Exact name of registrant as specified in its charter)
(State or Other Jurisdiction
of Incorporation)
(Commission File Number)
(IRS Employer
Identification No.)

Three Mill and Main Place, Suite 400
Maynard, Massachusetts 01754
(Address of principal executive offices)
(978) 938-4896
(Registrant’s telephone number, including area code)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Securities registered pursuant to Section 12(b) of the Securities Exchange Act of 1934:
Title of each classTrading Symbol(s)Name of exchange on which registered
Common Stock, $0.0001 par value per shareACIAThe Nasdaq Global Select Market
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).
Emerging growth company    
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.    

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.

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
Date: January 8, 2021
/s/ Janene I. Ásgeirsson
Janene I. Ásgeirsson
Chief Legal Officer and Secretary