ADTRAN HOLDINGS, INC.
901 EXPLORER BOULEVARD HUNTSVILLE, ALABAMA 35806 UNITED STATES OF AMERICA
ISIN US00486H1059 WKN A3C7M6
NOTICE OF ANNUAL MEETING OF STOCKHOLDERS TO BE HELD WEDNESDAY, MAY 10, 2023
NOTICE HEREBY IS GIVEN that the 2023 Annual Meeting of Stockholders (the “Annual Meeting”) of ADTRAN Holdings, Inc. (the “Company”)
will be held on Wednesday, May 10, 2023, at 10:30 a.m., Central Time, via live webcast. You can participate in the meeting
by visiting
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https://adtran.hvanmeldung.online
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and entering the shareholder number and password included on your proxy card. If you hold your shares through an intermediary,
such as a bank or broker, and do not have a shareholder number and password, please contact the bank or broker or our ADEUS
hotline (see below) to request a proxy card. Please log in to the website by 10:15 a.m., Central Time, on the day of the meeting.
There is no physical location for the Annual Meeting.
The Annual Meeting is being held for the purposes of considering and voting upon:
1. A proposal to elect nine directors to serve until the 2024 Annual Meeting of Stockholders;
2. An advisory proposal with respect to the compensation of the Company’s named executive officers (“NEOs”), as described
in the Compensation Discussion and Analysis, executive compensation tables and accompanying narrative in the Proxy Statement;
3. An advisory proposal with respect to the frequency of future votes on the compensation of the Company’s NEOs;
4. A proposal to ratify the appointment of PricewaterhouseCoopers LLP as the independent registered public accounting firm
of the Company for the fiscal year ending December 31, 2023; and
5. Such other business as properly may come before the Annual Meeting or any adjournments thereof. The Board of Directors
is not aware of any other business to be presented for a vote of the stockholders at the Annual Meeting.
The Board of Directors recommends that you vote FOR each of the nine director nominees; FOR the approval on an advisory basis
of the compensation of the Company’s NEOs; FOR the option of “EVERY YEAR” as the preferred frequency for future advisory votes
on the compensation of the Company’s NEOs; and FOR the ratification of the appointment of PricewaterhouseCoopers LLP as the
Company’s independent registered public accounting firm for the fiscal year ending December 31, 2023. The Annual Meeting may
be adjourned from time to time without notice other than announcement at the meeting or at adjournments thereof, and any business
for which notice is hereby given may be transacted at any such adjournment.
Information relating to the above matters is set forth in the Proxy Statement. Stockholders of record at the close of business
on March 13, 2023, are entitled to receive notice of and to vote during the Annual Meeting and any adjournments thereof.
Whether or not you plan to participate in the Annual Meeting, we urge you to review these materials carefully, which are available
at https://materials.proxyvote.com/00738A. We also encourage you to vote by one of the following means:
By Internet: Go to the website
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https://adtran.hvanmeldung.online
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and follow the instructions. You will need the shareholder number and password included on your proxy card to vote by Internet. Contact your bank or broker or our ADEUS hotline (see below) to request a proxy card.
By Mail: You may request a hard copy of the proxy materials, including a proxy card, by following the instructions on your Notice.
Contact your bank or broker or our ADEUS hotline (see below) to request a proxy card. If you request and receive a proxy card, please mark your selections on the proxy card, date and sign your name exactly as
it appears on the proxy card and mail the proxy card to ADEUS Aktienregister-Service-GmbH, Hauptversammlung, Postfach 57 03
64, 22772 Hamburg, Germany. Mailed proxy cards must be received no later than May 9, 2023 in order to be counted for the Annual
Meeting.
Contact our ADEUS hotline by telephone or email at
+49 (0) 89 – 2019 0365 or hauptversammlung-service@adeus.de
for questions regarding voting and using the online service.
You can submit questions in advance of the Annual Meeting by visiting https://adtran.hvanmeldung.online, entering your shareholder
number and password, and using the “Questions for Management” feature. You can submit questions during the Annual Meeting
by following the instructions on the meeting website. Management will answer pertinent questions in the “Investor Resources”
section of our website at https://investors.adtran.com. The questions and answers will be available as soon as practicable
after the Annual Meeting and will remain available for thirty (30) days after posting.
By order of the Board of Directors,
MICHAEL K. FOLIANO Senior Vice President of Finance, Chief Financial Officer and Corporate Secretary
Huntsville, Alabama, United States of America, March 28, 2023
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