As of November 6, 2026, ADTRAN Holdings, Inc. has reported 3 leadership change filings to the SEC under Item 5.02 of Form 8-K, from June 26, 2026 to October 29, 2026 (Form 8-K, October 29, 2026).
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Key facts
- · In / out: Reported · Person: not named in the filing · 8-K, 2026-10-29
- · In / out: Reported · Person: not named in the filing · 8-K, 2026-08-10
- · In / out: Reported · Person: not named in the filing · 8-K, 2026-06-26
ADTRAN Holdings, Inc. reported changes in 3 filings among its directors and officers to the SEC on Form 8-K, Item 5.02, from 2026-06-26 to 2026-10-29. Every row below is cited to the filing it comes from, and this page adds each new change as ADTRAN Holdings, Inc. files it.
Also on the record for ADTRAN Holdings, Inc.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| October 30, 2026 | Stake report, Schedule 13G, by Vanguard Capital Management | 5.13% of the class | 5%+ stakes | Source |
| April 28, 2026 | Stake report, Schedule 13G, by Vanguard Portfolio Management | 6.03% of the class | 5%+ stakes | Source |
| March 26, 2026 | Stake report, Schedule 13G/A, by The Vanguard Group | — | 5%+ stakes | Source |
| March 18, 2026 | Stake report, Schedule 13G/A, by EGORA Ventures AG | 4.9745% of the class | 5%+ stakes | Source |
| November 14, 2025 | Stake report, Schedule 13G/A, by Divisar Capital Management LLC | 4% of the class | 5%+ stakes | Source |
| August 14, 2025 | Stake report, Schedule 13G/A, by Divisar Capital Management LLC | 5.3% of the class | 5%+ stakes | Source |
| July 7, 2025 | Stake report, Schedule 13G/A, by The Vanguard Group | 10.2% of the class | 5%+ stakes | Source |
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More on ADTRAN Holdings, Inc. and the records around it.
ADTRAN Holdings, Inc. elsewhere on the record
Companies that share a holder
- Divisar Capital Management LLC also filed stake reports on 4 other companies: Orion S.A. (Feb 2026), Commerce.com, Inc. (Feb 2026), MasterCraft Boat Holdings, Inc. (Feb 2026)
- Vanguard Portfolio Management also filed stake reports on 941 other companies: Newmark Group Inc (Nov 2026), A10 Networks Inc (Oct 2026), ADT Inc (Oct 2026)
- Vanguard Capital Management also filed stake reports on 1495 other companies: A10 Networks Inc (Oct 2026), Altisource Portfolio Solutions SA (Oct 2026), Alto Neuroscience Inc (Oct 2026)
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Timeline
| Filed | In / out | Person | Role | Effective | Source |
|---|---|---|---|---|---|
| 2026-10-29 | Reported | not named in the filing | 8-K, 2026-10-29 | ||
| 2026-08-10 | Reported | not named in the filing | 8-K, 2026-08-10 | ||
| 2026-06-26 | Reported | not named in the filing | 8-K, 2026-06-26 |
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Reported
On October 27, 2026, the Board of Directors (the "Board") of ADTRAN Holdings, Inc. (the "Company"), upon the recommendation of the Board's Nominating and Corporate Governance Committee, voted unanimously to increase the size of the Board from seven (7) to eight (8) directors and to elect Christian Terlinde as a director, effective as of October 27, 2026 (the "Effective Date").
- The Board has determined that Dr. Terlinde qualifies as an "independent director" under Nasdaq listing standards.
- Dr. Terlinde will receive compensation for his 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.
Reported
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.
- 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.
- 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.
Reported
On June 23, 2026, the Board of Directors (the "Board") of ADTRAN Holdings, Inc. (the "Company"), upon the recommendation of the Board's Nominating and Corporate Governance Committee, voted unanimously to increase the size of the Board from six (6) to seven (7) directors and to elect Anne DelSanto to fill the vacancy created by the increase in the size of the Board, effective as of July 1, 2026 (the "Effective Date").
- In connection with her election to the Board, Ms. DelSanto was appointed to the Compensation Committee of the Board, effective as of the Effective Date.
- The Board has determined that Ms. DelSanto qualifies as an "independent director" under Nasdaq listing standards.
- 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.
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Where this comes from
A public company must file a current report on Form 8-K with the SEC within four business days when a director leaves or is elected, or when its chief executive, chief financial, chief accounting or chief operating officer, or another named executive, departs or is appointed. That disclosure goes under Item 5.02 of the report.
Every change on this page is taken from one of those filings and quoted in the company's own words, with a link to the filing, so it can be checked at the source. Where a filing names the person, the role and the date a change takes effect, they are shown beside the quote. Where it does not, the quote stands on its own. A filing states what changed; it rarely states why, and neither does this page.