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

## FORM 8-K

CURRENT REPORT

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

Date of Report (Date of earliest event reported): August 04, 2025

ADTRAN Holdings, Inc.

(Exact name of Registrant as Specified in Its Charter)

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

Registrant’s Telephone Number, Including Area Code: 256 963-8000

Not Applicable

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

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:

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

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. ☐

## Item 2.02 Results of Operations and Financial Condition.

On August 4, 2025, ADTRAN Holdings, Inc. (“ADTRAN”) announced its financial results for the second quarter ended June 30, 2025.

A copy of ADTRAN’s press release announcing its financial results is attached as Exhibit 99.1 hereto and incorporated by reference herein.

Item 7.01 Regulation FD Disclosure.

Executives from ADTRAN will review the financial results via a live audio webcast on Tuesday, August 5, 2025, at 9:30 a.m. Central Time, or 4:30 p.m. Central European Time. A copy of the investor presentation provided in connection with that review is attached as Exhibit 99.2 and incorporated by reference herein. An archived recording of the webcast will be available for a limited time on ADTRAN's Investor Relations page at https://investors.adtran.com.

The information included in, or incorporated into, Items 2.02 and 7.01 of this Current Report on Form 8-K is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

Item 9.01 Financial Statements and Exhibits.

Exhibit Number |  | Description
99.1 |  | Press Release dated August 4, 2025
99.2 |  | Visual Presentation of August 5, 2025
104 |  | Cover Page Interactive Data File – the cover page iXBRL tags are embedded within the Inline XBRL document

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.

|  |  | ADTRAN Holdings, Inc.
Date: | August 5, 2025 | By: | /s/ Timothy Santo
|  |  | Timothy Santo Senior Vice President of Finance and Chief Financial Officer