ADTRAN Holdings, Inc.
For the period ended Mar 27, 2026. Filed Mar 27, 2026.
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Mar 27, 2026 · Filed Mar 27, 2026
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Contents
Proxy Statement
| Corporate Office | U.S. Mail | Toll-Free: 1 800 9Adtran | |||
| 901 Explorer Blvd. | P.O. Box 140000 | Telephone: 256 963 8000 | |||
| Huntsville, AL 35806 | Huntsville, AL 35814-4000 | https://www.adtran.com |
March 27, 2026
Dear Stockholder:
You are cordially invited to attend the 2026 Annual Meeting of Stockholders of ADTRAN Holdings, Inc. to be held on Wednesday, May 13, 2026, at 10:30 a.m., Central Time. We are pleased to announce that this year’s Annual Meeting will be a virtual meeting conducted by live webcast on the Internet. You will be able to attend and participate in the meeting by visitingwww.virtualshareholdermeeting.com/ADTN2026 and entering the 16-digit control number included on your Notice of Internet Availability of Proxy Materials (the “Notice”) or on your proxy card if you receive the proxy materials by mail. You will not be able to attend the Annual Meeting in person.
The attached Notice of Annual Meeting of Stockholders and Proxy Statement describe the formal business to be transacted at the meeting.
We have elected to take advantage of Securities and Exchange Commission rules that allow issuers to furnish proxy materials to their stockholders on the Internet. We believe that the rules will allow us to provide our stockholders with the information they need, while lowering the costs of delivery and reducing the environmental impact of the annual meeting.
Your vote, whether during the virtual meeting on May 13, 2026, or by proxy, is important. Please review the instructions on each of your voting options described in the accompanying proxy materials and the Notice you received in the mail. If you are unable to participate in the virtual meeting, I urge you to vote as soon as possible.
Sincerely,
THOMAS R. STANTON
Chairman of the Board
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