# EDGAR Filing Document

**Accession Number:** 0000926282
**File Stem:** 0001193125-23-081611
**Filing Date:** 2023-3
**Character Count:** 4733
**Document Hash:** 9e1bbd6d299a22d6c4cf409d0d9d06f7
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-23-081611.hdr.sgml**: 20230328

**ACCESSION NUMBER**: 0001193125-23-081611

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20230328

**DATE AS OF CHANGE**: 20230328

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ADTRAN Holdings, Inc.
- **CENTRAL INDEX KEY:** 0000926282
- **STANDARD INDUSTRIAL CLASSIFICATION:** TELEPHONE & TELEGRAPH APPARATUS [3661]
- **IRS NUMBER:** 872164282
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-41446
- **FILM NUMBER:** 23766749

**BUSINESS ADDRESS:**
- **STREET 1:** 901 EXPLORER BLVD
- **CITY:** HUNTSVILLE
- **STATE:** AL
- **ZIP:** 35806
- **BUSINESS PHONE:** 256-963-8220

**MAIL ADDRESS:**
- **STREET 1:** 901 EXPLORER BLVD
- **CITY:** HUNTSVILLE
- **STATE:** AL
- **ZIP:** 35806

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ADTRAN INC
- **DATE OF NAME CHANGE:** 19940705

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**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549** 

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**SCHEDULE 14A** 

**(Rule 14a-101)** 

**INFORMATION REQUIRED IN PROXY STATEMENT** 

**SCHEDULE 14A INFORMATION** 

**Proxy Statement Pursuant to Section 14(a) of the** 

**Securities Exchange Act of 1934** 

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Filed by the Registrant ☒ Filed by a party other than the Registrant ☐

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ **Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))** 

☐ Definitive Proxy Statement

☒ Definitive Additional Materials

☐ Soliciting Material Pursuant to §240.14a-12

## ADTRAN Holdings, Inc.
**(Name of Registrant as Specified in its Charter)** 

**Not applicable.** 

**(Name of Person(s) Filing Proxy Statement, if other than the Registrant)** 

Payment of Filing Fee (Check all boxes that apply):

☒ No fee required.

☐ Fee paid previously with preliminary materials.

☐ Fee computed on table in exhibit required by Item 25 (b) per Exchange Act Rules 14a-6 (i) (1) and D-11.

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![LOGO](g305204dsp003.jpg)

Your Vote Counts! ADTRAN HOLDINGS, INC. 2023 Annual Meeting Vote by May 9, 2023 11:59 PM ET. For shares held in a Plan, vote by May 8, 2023 11:59 PM ET. ADTRAN HOLDINGS, INC. 901 EXPLORER BOULEVARD HUNTSVILLE, AL 35806 D99456-P86520 You invested in ADTRAN HOLDINGS, INC. and it's time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the stockholder meeting to be held on May 10, 2023. Get informed before you vote View the Notice and Proxy Statement for the 2023 Annual Meeting and the 2022 Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to April 26, 2023. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. For complete information and to vote, visit www.ProxyVote.com Control # Smartphone users Vote Virtually at the Meeting\* Point your camera here and May 10, 2023 10:30 a.m., Central Time vote without entering a control number Virtually at: www.virtualshareholdermeeting.com/ADTN2023 \*Please check the meeting materials for any special requirements for meeting attendance. V1.1

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![LOGO](g305204dsp004.jpg)

Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. Voting Items Board Recommends 1. Election of Directors Nominees: 1a. Thomas R. Stanton For 1b. Johanna Hey For 1c. H. Fenwick Huss For 1d. Gregory J. McCray For 1e. Balan Nair For 1f. Brian Protiva For 1g. Jacqueline H. Rice For 1h. Nikos Theodosopoulos For 1i. Kathryn A. Walker For 2. Non-binding approval of the compensation of Adtran's named executive officers. For 3. Non-binding vote on the frequency of future votes on the compensation of Adtran's named executive officers. Every Year 4. Ratify the appointment of PricewaterhouseCoopers LLP as the independent registered public accounting firm of Adtran For for the fiscal year ending December 31, 2023. NOTE: Such other business as may properly come before the meeting or any adjournment thereof. Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click "Sign up for E-delivery". D99457-P86520