ADTRAN Holdings, Inc 8-K, filed Aug 10, 2026
ADTRAN Holdings, Inc. (ADTN)
About this 8-K
ADTRAN Holdings, Inc filed this 8-K on August 10, 2026.
Items reported
- Item 5.02: Director or officer change, or executive pay
- Item 9.01: Financial statements and exhibits
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
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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:
Securities registered pursuant to Section 12(b) of the Act:
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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. ☐
Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.
On August 10, 2026, Adtran Networks SE (“Adtran Networks”), a majority-owned subsidiary of ADTRAN Holdings, Inc. (the “Company”), entered into an amendment (the “Amendment”) to its employment agreement with Christoph Glingener, the Company’s Chief Technology Officer (“CTO”) and the CTO and a member of the management board of Adtran Networks. The Amendment provides that the term of Dr. Glingener’s employment agreement remains in force through December 31, 2026 and affirms that Dr. Glingener’s annual base salary remains €400,000.
The Amendment further provides that Dr. Glingener will continue to be eligible to receive an annual grant of an incentive cash bonus award tied to the Company’s total revenue and adjusted earnings before interest and taxes, with the targeted size of the grant to equal 60% of Dr. Glingener’s base salary. Additionally, Dr. Glingener remains eligible to receive annual grants of time-based restricted stock units (“RSUs”), with the target size of the annual RSU grant to equal 75% of Dr. Glingener’s base salary. The RSUs are subject to a cap of €903,729.
Additionally, the Amendment provides that Dr. Glingener shall receive an award of three-year financial plan performance stock units (the “long-term financial plan PSU awards”) with a target grant size amount of €903,729, which grant shall be divided into three separate annual tranches. The performance objective of the long-term financial plan PSU awards is based upon the Company’s Adjusted EBIT over the performance period of January 1, 2026 through December 31, 2028, subject to adjustment based on the Company’s relative total shareholder return over such performance period. Dr. Glingener’s long-term financial plan PSU awards are subject to a cap of €2,000,000. As previously disclosed, the Compensation Committee of the Board of Directors of the Company (the “Compensation Committee”) does not intend to grant annual PSU awards tied to the performance objective of the Company’s relative total shareholder return (referred to as market-based PSUs in the Company’s definitive proxy statement filed with the SEC on March 27, 2026) to any of the named executive officers going forward.
Consistent with the terms of the Amendment, grants of time-based RSUs and long-term financial plan PSUs were issued to Dr. Glingener on August 10, as approved by the Compensation Committee.
Finally, the Amendment provides that Dr. Glingener’s total annual remuneration remains capped at €2,800,000.
The foregoing descriptions of the Amendment, the time-based RSUs and the long-term financial plan PSU awards are not complete and are qualified in their entirety by the Amendment, the form of Restricted Stock Unit Agreement and the form of 2026 3-Year Performance Shares Agreement, respectively, which are attached hereto as Exhibits 10.1, 10.2 and 10.3 and are incorporated herein by reference.
Item 9.01 Financial Statements and Exhibits.
Exhibit Number |
Description |
10.1 |
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10.2 |
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10.3 |
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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.
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ADTRAN Holdings, Inc. |
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Date: |
August 10, 2026 |
By: |
/s/ Timothy Santo |
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Timothy Santo |
Exhibit 10.1
AMENDMENT TO OFFICER'S EMPLOYMENT AGREEMENT
DIENSTVERTRAGSANDERUNG VORSTANDSMITGLIED
Adtran Networks SE, Martinsried/Meiningen
- hereinafter the "Company" -
represented by the Supervisory Board
- im Folgenden die "Gesellschaft" -
vertreten durch den Aufsichtsrat
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And und
Mr./Herrn
Dr. Christoph Glingener
Sandweg 7 26349Jade
- hereinafter: the "Officer" -
- im Folgenden: das "Vorstandsmitglied" -
The Officer has been a member of the management-' board of the Company· since January 1, 2007. The current Officer's Employment Agreement remains in full force and effect and continues until December 31, 2026.
The current Officer's Employment Agreement was extended the last time on December 9, 2025, until December 31, 2026, and unless expressly modified hereinafter remains in full force and effect and continues until December 31, 2026.
On June 15, 2026, the Annual General Meeting of the Company approved a new remuneration system for the members of the Management Board of the Company ("Remuneration System'').
The parties enter into this Amendment for the purpose of aligning the Officer's remuneration with the Remuneration System only for the calendar year 2026.
Das Vorstandsmitglied ist seit 1. Januar 2007 Mitglied des Vorstands der Gesellschaft. Der bestehende Dienstvertrag mit dem Vorstandsmitglied ist befristet und endet mit Ablauf des 31. Dezember 2026.
Der bestehende Dienstvertrag mit dem Vorstandsmitglied wurde zuletzt am 9. Dezember 2025 bis zum 31. Dezember 2026 verlangert, und bleibt so weit nicht nachfolgend ausdrucklich geandert bis zum Ablauf des 31. Dezember 2026 unverandert in Kraft.
Die Hauptversammlung der Gesellschaft hat am 15. Juni 2026 ein neues Vergutungssystem fur die Mitglieder des Vorstands der Gesellschaft (,,Vergutungssystem'') gebilligt.
Die Parteien schlieBen diesen Nachtrag, um die Vergutung des Vorstandsmitglieds an das Vergutungssystem nur fur das Kalenderjahr 2026 anzupassen.
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Adtran Confidential
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The Officer's remuneration shall be governed by the Remuneration System, as specified in the attached Exhibit 1.
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Die Vergutung des Vorstandsmitglieds richtet sich nach dem Vergutungssystem, wie in der beigefugten Anlage 1 naher festgelegt.
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the Annual General Meeting on June 15, 2026 ("Remuneration System") also apply.
vorgesehenen Einbehaltungs-Ruckforderungsklauseln.
und
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[Signature Page follows}
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Adtran Confidential
Munchen, 10.8.2026 2026 Munchen, 5.8.26 2026
/s/ Dr. Eduard Scheiterer /s/ Dr. Christoph Glingener
Dr. Eduard Scheiterer Dr. Christoph Glingener
Chairman of the Supervisory Board
. .
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