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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 01, 2021

ADTRAN, Inc.

(Exact name of Registrant as Specified in Its Charter)

Delaware | 000-24612 | 63-0918200
(State or Other Jurisdiction of Incorporation) | (Commission File Number) | (IRS Employer Identification No.)
901 Explorer Boulevard |
Huntsville, Alabama |  | 35806-2807
(Address of Principal Executive Offices) |  | (Zip Code)

Registrant’s Telephone Number, Including Area Code: 256 963-8000

Not Applicable

(Former Name or Former Address, if Changed Since Last Report)

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 Act:

Title of each class |  | Trading Symbol(s) |  | Name of each exchange on which registered
Common Stock, Par Value $0.01 per share |  | ADTN |  | 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 7.01 Regulation FD Disclosure.

As previously disclosed, on August 30, 2021, ADTRAN, Inc., a Delaware corporation (“ADTRAN”), and ADVA Optical Networking SE, a European stock corporation incorporated under the laws of the European Union and Germany (“ADVA”), entered into a business combination agreement, pursuant to which both companies agreed to combine their respective businesses and each become subsidiaries of a new holding company, Acorn HoldCo, Inc., a Delaware corporation and currently a wholly-owned direct subsidiary of ADTRAN (“Acorn HoldCo”).

Attached as Exhibit 99.1 is a supplemental investor presentation that the parties intend to use to discuss the business combination transaction with investors and other third parties.

ADTRAN is furnishing the information in this Item 7.01 and Exhibit 99.1 to comply with Regulation FD promulgated by the Securities and Exchange Commission (“SEC”). The information contained in this Item 7.01, including Exhibit 99.1, shall not be deemed “filed” for any purpose, including for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that Section, nor shall such information be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, except as expressly set forth by specific reference in such a filing.

Important Information for Investors and Stockholders

This Current Report on Form 8-K does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval. It does not constitute a prospectus or prospectus equivalent document. No offering of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act.

In connection with the proposed transaction between ADTRAN and ADVA, Acorn HoldCo has filed a registration statement on Form S-4 with the SEC, which includes (1) a proxy statement of ADTRAN that also constitutes a preliminary prospectus for Acorn HoldCo and (2) an offering prospectus of Acorn HoldCo being used in connection with Acorn HoldCo’s offer to acquire ADVA shares held by U.S. holders. The registration statement has not yet become effective. After the registration statement is declared effective by the SEC, ADTRAN will mail the proxy statement/prospectus to its stockholders in connection with the vote to approve the proposed business combination transaction, and Acorn HoldCo will distribute the offering prospectus to ADVA shareholders in the United States in connection with Acorn HoldCo’s offer to acquire all of the outstanding shares of ADVA. Acorn HoldCo has also filed an offer document with the German Federal Financial Supervisory Authority (“BaFin”).

INVESTORS AND SECURITY HOLDERS OF ADTRAN AND ADVA ARE URGED TO READ THE PROXY STATEMENT/PROSPECTUS, THE OFFER DOCUMENT AND OTHER DOCUMENTS THAT HAVE BEEN OR WILL BE FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY BECAUSE THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION.

Investors and security holders may obtain free copies of the proxy statement/prospectus and other documents filed with the SEC by ADTRAN or Acorn HoldCo through the website maintained by the SEC at http://www.sec.gov. Copies of the documents filed with the SEC by ADTRAN are available free of charge at https://investors.adtran.com/ and under the heading “SEC Filings”. Furthermore, the German language version of the offer document will be published by way of announcement on the internet at www.acorn-offer.com and by keeping available copies free of charge at the settlement agent. You can obtain a copy of the non‑binding English translation of the offer document on the internet at www.acorn-offer.com.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits. The following exhibit is filed with this report:

99.1 |  | Investor Presentation

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

|  |  | ADTRAN, Inc.
Date: | November 2, 2021 | By: | /s/ Michael Foliano
|  |  | Michael Foliano Senior Vice President of Finance and Chief Financial Officer