# EDGAR Filing Document

**Accession Number:** 0000926282
**File Stem:** 0001193125-26-283882
**Filing Date:** 2026-6
**Character Count:** 8752
**Document Hash:** 1d55d193fec7ca58407c3c4034fed9a5
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-283882.hdr.sgml**: 20260626

**ACCESSION NUMBER**: 0001193125-26-283882

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 11

**CONFORMED PERIOD OF REPORT**: 20260623

**ITEM INFORMATION**: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

**ITEM INFORMATION**: Other Events

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260626

**DATE AS OF CHANGE**: 20260626

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ADTRAN Holdings, Inc.
- **CENTRAL INDEX KEY:** 0000926282
- **STANDARD INDUSTRIAL CLASSIFICATION:** TELEPHONE & TELEGRAPH APPARATUS [3661]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 872164282
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-41446
- **FILM NUMBER:** 261123815

**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

?xml version='1.0' encoding='ASCII'? 8-K

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

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## FORM 8-K

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**CURRENT REPORT**

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

**Date of Report (Date of earliest event reported):** June 23, 2026<br>

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ADTRAN Holdings, Inc.

**(Exact name of Registrant as Specified in Its Charter)**

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| | | |
|:---|:---|:---|
| Delaware | 001-41446 | 87-2164282 |
| **(State or Other Jurisdiction<br>of Incorporation)** | **(Commission File Number)** | **(IRS Employer<br>Identification No.)** |
| 901 Explorer Boulevard |  |  |
| Huntsville**,** Alabama |  | 35806-2807 |
| **(Address of Principal Executive Offices)** |  | **(Zip Code)** |

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**Registrant's Telephone Number, Including Area Code:** (256) 963-8000<br>

Not Applicable

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

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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:**

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| | | |
|:---|:---|:---|
| **<br>Title of each class** | **Trading<br>Symbol(s)** | **<br>Name of each exchange on which registered** |
| Common Stock, Par Value $0.01 per share | ADTN | Nasdaq Global Select Market |

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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. ☐

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## Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

There are no arrangements or understandings between Ms. DelSanto and any other person pursuant to which Ms. DelSanto was selected as a director of the Company. There are no related person transactions (within the meaning of Item 404(a) of Regulation S-K promulgated by the Securities and Exchange Commission) between Ms. DelSanto and the Company. Ms. DelSanto will receive compensation for her Board service in accordance with the Company's standard compensation arrangements for non-employee directors, which are described under the caption "2025 Director Compensation" in the Company's definitive proxy statement on Schedule 14A filed with the Securities and Exchange Commission on March 27, 2026, as adjusted by the Board from time to time.

## Item 8.01 Other Events.
On June 25, 2026, the Company issued a press release announcing the appointment of Ms. DelSanto to the Board, which press release contains additional biographical information about Ms. DelSanto. A copy of this press release is attached hereto as Exhibit 99.1.

## Item 9.01 Financial Statements and Exhibits.
(d) Exhibits

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| | |
|:---|:---|
| **<u>Exhibit Number</u>**<br>| **<u>Description</u>** |
| 99.1<br>| [<u>Press Release dated June 25, 2026</u>](adtn-ex99_1.htm) |
| 104<br>| Cover Page Interactive Data File – the cover page iXBRL tags are embedded within the Inline XBRL document |

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**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 hereunto duly authorized.

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| | | | |
|:---|:---|:---|:---|
|  |  |  | ADTRAN Holdings, Inc. |
| Date: | June 26, 2026 | By:  | /s/ Timothy Santo |
|  |  |  | Timothy Santo<br>Senior Vice President of Finance and<br>Chief Financial Officer |

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## Exhibit 99.1

## Exhibit 99.1

## Adtran Holdings, Inc. Appoints Anne DelSanto to Board of Directors
HUNTSVILLE, Ala. – (June 25, 2026) – Adtran Holdings, Inc. (NASDAQ: ADTN and FSE: QH9), a leading global provider of networking and communications solutions, today announced the appointment of Anne DelSanto as an independent member of its Board of Directors effective July 1, 2026. The appointment aligns with Adtran's expanding relevance beyond its service provider core, into cloud infrastructure, AI-driven networking, and enterprise software, markets where Ms. DelSanto has spent the majority of her career.

Ms. DelSanto brings more than 30 years of experience in the global technology industry focused on cloud computing, software-as-a-service (SaaS), artificial intelligence, and enterprise go-to-market strategy. Her professional career included executive operational and technical roles at companies including Salesforce, Oracle, and IBM.

Ms. DelSanto currently serves on the board of directors of Advanced Energy (NASDAQ: AEIS), a company that designs and manufactures precision power solutions for hyperscale AI, semiconductor, and industrial markets, and on the boards of private technology companies, Axonius and StackAdapt. She formerly served on the boards of Juniper Networks and New Relic, both during their tenure of being publicly traded.

"Anne's experience building and scaling cloud and SaaS platforms will be a valuable addition to our Board," said Tom Stanton, Chairman and Chief Executive Officer of Adtran Holdings, Inc. "Her relevant public board experience combined with her experience with hyperscalers, AI-driven infrastructure, and next-generation service provider solutions aligns with Adtran's strategic direction. We are delighted to welcome her."

Ms. DelSanto holds a Bachelor of Science in mathematics with a concentration in computer science from St. John's University and a Master of Science in administrative studies from Boston College. She has also completed advanced governance studies at Stanford University Law School's Directors' College.

**About Adtran**<br> ADTRAN Holdings, Inc. (NASDAQ: ADTN and FSE: QH9) is the parent company of Adtran, Inc., a leading global provider of open, disaggregated networking and communications solutions that enable voice, data, video and internet communications across any network infrastructure. From the cloud edge to the subscriber edge, Adtran empowers communications service providers around the world to manage and scale services that connect people, places and things. Adtran solutions are used by service providers, private enterprises, government organizations and millions of individual users worldwide. ADTRAN Holdings, Inc. is also the majority shareholder of Adtran Networks SE, formerly ADVA Optical Networking SE. Find more at Adtran.com, LinkedIn and X.

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**Published by**<br> ADTRAN Holdings, Inc.<br>www.adtran.com

![img50768744_0.gif](img50768744_0.gif)**For media**<br>Gareth Spence<br>+44 1904 699 358<br>public.relations@adtran.com

**For investors**<br>Rob Fink<br>investor.relations@adtran.com

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