ADTRAN, Inc. Announces Date for Special Meeting of Stockholders

ADTRAN, Inc., (NASDAQ: ADTN) today announced that it will hold a special meeting of its stockholders (“Special Meeting”) on January 6, 2022, to adopt the Business Combination Agreement, dated as of August 30, 2021, by and among ADTRAN, Inc., Acorn HoldCo, Inc., Acorn MergeCo, Inc., and ADVA Optical Networking SE, pursuant to which, among other things, ADTRAN, Inc. and ADVA Optical Networking SE agreed to combine their businesses through a merger and an exchange offer, respectively, and become subsidiaries of Acorn HoldCo, Inc.

The Special Meeting will be held virtually via webcast at www.virtualshareholdermeeting.com/ADTN2022SM at 10:30 AM Central Standard Time. ADTRAN stockholders of record as of the close of business on November 16, 2021, the record date for the ADTRAN Special Meeting, will be entitled to receive notice of and to vote at the ADTRAN Special Meeting or any adjournment or postponement thereof. Stockholders will be able to listen to the meeting live and vote during the meeting. Please log into the website by 10:30 AM Central Standard Time on the day of the meeting. There is no physical location for the Special Meeting.

ADTRAN stockholders are encouraged to vote their shares prior to the Special Meeting. Most stockholders have a choice of voting over the internet, by using a toll-free telephone number, or by completing a proxy card or voting instruction card, as described in ADTRAN’s proxy statement that is being distributed to its stockholders and that has been filed with the Securities and Exchange Commission and is available on ADTRAN’s website at https://investors.adtran.com/ (under the heading “SEC Filings”). Information on voting and applicable deadlines for using the proxy card, or voting by telephone or through the internet, are set forth in the proxy materials being distributed by ADTRAN to its stockholders. Alternatively, ADTRAN stockholders may vote during the Special Meeting virtually by ballot.

About ADTRAN

At ADTRAN, Inc., we believe amazing things happen when people connect. From the cloud edge to the subscriber edge, we help communications service providers around the world manage and scale services that connect people, places and things to advance human progress. Whether rural or urban, domestic or international, telco or cable, enterprise or residential—ADTRAN solutions optimize existing technology infrastructures and create new, multi-gigabit platforms that leverage cloud economics, data analytics, machine learning and open ecosystems—the future of global networking. Find more at ADTRAN, LinkedIn and Twitter.