Form 8-K
8-K — ADTRAN Holdings, Inc.
Accession: 0001193125-26-228208
Filed: 2026-05-18
Period: 2026-05-13
CIK: 0000926282
SIC: 3661 (TELEPHONE & TELEGRAPH APPARATUS)
Item: Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year
Item: Submission of Matters to a Vote of Security Holders
Item: Financial Statements and Exhibits
Documents
8-K — adtn-20260513.htm (Primary)
EX-3.1 (adtn-ex3_1.htm)
XML — IDEA: XBRL DOCUMENT (R1.htm)
8-K
8-K (Primary)
Filename: adtn-20260513.htm · Sequence: 1
8-K
0000926282false--12-3100009262822026-05-132026-05-13
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): May 13, 2026
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 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.
At the Annual Meeting of Stockholders held by ADTRAN Holdings, Inc. (the “Company”) on May 13, 2026 (the “2026 Annual Meeting”), the Company’s stockholders approved an amendment (the “Charter Amendment”) to the Company’s Amended and Restated Certificate of Incorporation (the “Charter”). As further described in Proposal 2 of the Company’s definitive proxy statement filed with the Securities and Exchange Commission on March 27, 2026, the Charter Amendment provides for the elimination of monetary liability (i.e., exculpation) of certain officers of the Company in the limited circumstances permitted under Delaware law and made certain additional changes to Section 7.1 of the Charter. The Charter Amendment became effective upon the filing of a Certificate of Amendment (the “Certificate of Amendment”) with the Secretary of State of the State of Delaware on May 13, 2026.
The foregoing summary is not complete and is qualified in its entirety by reference to the full text of the Certificate of Amendment, a copy of which is filed as Exhibit 3.1 and incorporated by reference herein.
Item 5.07 Submission of Matters to a Vote of Security Holders.
At the 2026 Annual Meeting, the Company’s stockholders (i) elected six directors to serve on the board of directors of the Company (the “Board”) for a one-year term expiring at the 2027 Annual Meeting of Stockholders and until their successors have been duly elected and qualified (Proposal 1); (ii) approved the Charter Amendment to limit the liability of certain officers as permitted by Delaware law and to make certain other changes to Section 7.1 thereof (Proposal 2); (iii) approved, on an advisory basis, the compensation of the Company’s named executive officers (Proposal 3); and (iv) ratified the appointment of PricewaterhouseCoopers LLP as the independent registered public accounting firm of the Company for the fiscal year ending December 31, 2026 (Proposal 4). The voting results for these proposals are presented in the tables below:
Proposal 1 - Election of Directors
For
Against
Abstain
Broker Non-Votes
Thomas R. Stanton
48,261,250
4,686,183
65,014
9,313,693
H. Fenwick Huss
49,570,974
3,375,771
65,702
9,313,693
Gregory J McCray
50,408,661
2,500,847
102,939
9,313,693
Jacqueline H. Rice
48,662,681
4,290,891
58,875
9,313,693
Nikos Theodosopoulos
50,543,871
2,408,380
60,196
9,313,693
Kathryn A. Walker
51,399,106
1,555,109
58,232
9,313,693
Proposal 2 - Amendment to Amended and Restated Certificate of Incorporation to Limit the Liability of Certain Officers as Permitted by Delaware Law and to Make Certain Other Changes to Section 7.1 Thereof
For
Against
Abstain
Broker Non-Votes
49,777,494
3,184,044
50,909
9,313,693
Proposal 3 - Advisory Vote Regarding the Compensation of the Company's Named Executive Officers
For
Against
Abstain
Broker Non-Votes
49,881,975
3,077,276
53,196
9,313,693
Proposal 4 - Ratification of the Appointment of PricewaterhouseCoopers LLP as the Company’s Independent Registered Public Accounting Firm for the Fiscal Year Ending December 31, 2026
For
Against
Abstain
61,869,565
413,517
43,058
Item 9.01 Financial Statements and Exhibits.
(d) Exhibits
Exhibit Number
Description
3.1
Certificate of Amendment to the Certificate of Incorporation of ADTRAN Holdings, Inc., effective as of May 13, 2026
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:
May 18, 2026
By:
/s/ Timothy Santo
Timothy Santo
Senior Vice President of Finance and
Chief Financial Officer
EX-3.1
EX-3.1
Filename: adtn-ex3_1.htm · Sequence: 2
EX-3.1
Exhibit 3.1
CERTIFICATE OF AMENDMENT TO THE
AMENDED AND RESTATED CERTIFICATE OF INCORPORATION
OF
ADTRAN HOLDINGS, INC.
ADTRAN Holdings, Inc. (the “Corporation”), a corporation organized and existing under and by virtue of the General Corporation Law of the State of Delaware (the “DGCL”) does hereby certify:
FIRST: The name of the Corporation is ADTRAN Holdings, Inc.
SECOND: The Board of Directors of the Corporation duly adopted resolutions approving the following amendment to the Amended and Restated Certificate of Incorporation of the Corporation (the “Amended and Restated Certificate of Incorporation”), declaring such amendment advisable and that such amendment be submitted to the stockholders of the Corporation for their consideration at the next annual meeting of stockholders.
THIRD: The following amendment was duly adopted in accordance with the provisions of Section 242 of the DGCL.
FOURTH: Section 7.1 of the Amended and Restated Certificate of Incorporation is hereby amended and restated in its entirety as follows:
Section 7.1. Limitation of Liability. To the fullest extent permitted by law, no director or officer of the Corporation shall be personally liable for monetary damages for breach of fiduciary duty as a director or officer. Without limiting the effect of the preceding sentence, if the DGCL is hereafter amended to authorize the further elimination or limitation of the liability of a director or officer, then the liability of a director or officer of the Corporation shall be eliminated or limited to the fullest extent permitted by the DGCL, as so amended.
No amendment, repeal or elimination of this Section 7.1, nor the adoption of any provision of this Certificate of Incorporation inconsistent with this Section 7.1, shall eliminate, reduce or otherwise adversely affect any limitation on the personal liability of a director or officer of the Corporation existing at the time of such amendment, repeal, elimination or adoption of such an inconsistent provision.
FOURTH: All other provisions of the Amended and Restated Certificate of Incorporation shall remain in full force and effect.
FIFTH: This Certificate of Amendment shall become effective upon filing.
IN WITNESS WHEREOF, this Certificate of Amendment to Amended and Restated Certificate of Incorporation of the Corporation has been executed by a duly authorized officer on this 13th day of May, 2026.
ADTRAN Holdings, Inc.
By: /s/ Timothy Santo____________
Name: Timothy Santo
Title: Senior Vice President – Finance and Chief Financial Officer, Treasurer, and Principal Accounting Officer
XML — IDEA: XBRL DOCUMENT
XML
Filename: R1.htm · Sequence: 5
v3.26.1
Document And Entity Information
May 13, 2026
Cover [Abstract]
Document Type
8-K
Amendment Flag
false
Current Fiscal Year End Date
--12-31
Document Period End Date
May 13, 2026
Entity Registrant Name
ADTRAN Holdings, Inc.
Entity Central Index Key
0000926282
Entity Emerging Growth Company
false
Entity File Number
001-41446
Entity Incorporation, State or Country Code
DE
Entity Tax Identification Number
87-2164282
Entity Address, Address Line One
901 Explorer Boulevard
Entity Address, City or Town
Huntsville
Entity Address, State or Province
AL
Entity Address, Postal Zip Code
35806-2807
City Area Code
(256)
Local Phone Number
963-8000
Entity Information, Former Legal or Registered Name
Not Applicable
Written Communications
false
Soliciting Material
false
Pre-commencement Tender Offer
false
Pre-commencement Issuer Tender Offer
false
Title of 12(b) Security
Common Stock, Par Value $0.01 per share
Trading Symbol
ADTN
Security Exchange Name
NASDAQ
X
- Definition
Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.
+ References
No definition available.
+ Details
Name:
dei_AmendmentFlag
Namespace Prefix:
dei_
Data Type:
xbrli:booleanItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Area code of city
+ References
No definition available.
+ Details
Name:
dei_CityAreaCode
Namespace Prefix:
dei_
Data Type:
xbrli:normalizedStringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Cover page.
+ References
No definition available.
+ Details
Name:
dei_CoverAbstract
Namespace Prefix:
dei_
Data Type:
xbrli:stringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
End date of current fiscal year in the format --MM-DD.
+ References
No definition available.
+ Details
Name:
dei_CurrentFiscalYearEndDate
Namespace Prefix:
dei_
Data Type:
xbrli:gMonthDayItemType
Balance Type:
na
Period Type:
duration
X
- Definition
For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.
+ References
No definition available.
+ Details
Name:
dei_DocumentPeriodEndDate
Namespace Prefix:
dei_
Data Type:
xbrli:dateItemType
Balance Type:
na
Period Type:
duration
X
- Definition
The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.
+ References
No definition available.
+ Details
Name:
dei_DocumentType
Namespace Prefix:
dei_
Data Type:
dei:submissionTypeItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Address Line 1 such as Attn, Building Name, Street Name
+ References
No definition available.
+ Details
Name:
dei_EntityAddressAddressLine1
Namespace Prefix:
dei_
Data Type:
xbrli:normalizedStringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Name of the City or Town
+ References
No definition available.
+ Details
Name:
dei_EntityAddressCityOrTown
Namespace Prefix:
dei_
Data Type:
xbrli:normalizedStringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Code for the postal or zip code
+ References
No definition available.
+ Details
Name:
dei_EntityAddressPostalZipCode
Namespace Prefix:
dei_
Data Type:
xbrli:normalizedStringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Name of the state or province.
+ References
No definition available.
+ Details
Name:
dei_EntityAddressStateOrProvince
Namespace Prefix:
dei_
Data Type:
dei:stateOrProvinceItemType
Balance Type:
na
Period Type:
duration
X
- Definition
A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2
+ Details
Name:
dei_EntityCentralIndexKey
Namespace Prefix:
dei_
Data Type:
dei:centralIndexKeyItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Indicate if registrant meets the emerging growth company criteria.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2
+ Details
Name:
dei_EntityEmergingGrowthCompany
Namespace Prefix:
dei_
Data Type:
xbrli:booleanItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.
+ References
No definition available.
+ Details
Name:
dei_EntityFileNumber
Namespace Prefix:
dei_
Data Type:
dei:fileNumberItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Two-character EDGAR code representing the state or country of incorporation.
+ References
No definition available.
+ Details
Name:
dei_EntityIncorporationStateCountryCode
Namespace Prefix:
dei_
Data Type:
dei:edgarStateCountryItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Former Legal or Registered Name of an entity
+ References
No definition available.
+ Details
Name:
dei_EntityInformationFormerLegalOrRegisteredName
Namespace Prefix:
dei_
Data Type:
xbrli:normalizedStringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2
+ Details
Name:
dei_EntityRegistrantName
Namespace Prefix:
dei_
Data Type:
xbrli:normalizedStringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2
+ Details
Name:
dei_EntityTaxIdentificationNumber
Namespace Prefix:
dei_
Data Type:
dei:employerIdItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Local phone number for entity.
+ References
No definition available.
+ Details
Name:
dei_LocalPhoneNumber
Namespace Prefix:
dei_
Data Type:
xbrli:normalizedStringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 13e
-Subsection 4c
+ Details
Name:
dei_PreCommencementIssuerTenderOffer
Namespace Prefix:
dei_
Data Type:
xbrli:booleanItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 14d
-Subsection 2b
+ Details
Name:
dei_PreCommencementTenderOffer
Namespace Prefix:
dei_
Data Type:
xbrli:booleanItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Title of a 12(b) registered security.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b
+ Details
Name:
dei_Security12bTitle
Namespace Prefix:
dei_
Data Type:
dei:securityTitleItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Name of the Exchange on which a security is registered.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection d1-1
+ Details
Name:
dei_SecurityExchangeName
Namespace Prefix:
dei_
Data Type:
dei:edgarExchangeCodeItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 14a
-Subsection 12
+ Details
Name:
dei_SolicitingMaterial
Namespace Prefix:
dei_
Data Type:
xbrli:booleanItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Trading symbol of an instrument as listed on an exchange.
+ References
No definition available.
+ Details
Name:
dei_TradingSymbol
Namespace Prefix:
dei_
Data Type:
dei:tradingSymbolItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Securities Act
-Number 230
-Section 425
+ Details
Name:
dei_WrittenCommunications
Namespace Prefix:
dei_
Data Type:
xbrli:booleanItemType
Balance Type:
na
Period Type:
duration