ADTRAN Holdings, Inc. filed a Form 8-K on October 29, 2026, disclosing that its Board of Directors unanimously elected Christian Terlinde as a new director effective October 27, 2026.

Key Highlights

  • Board expansion: The Board voted unanimously to increase its size from seven to eight directors.
  • New director: Christian Terlinde was elected to the Board effective October 27, 2026, upon recommendation of the Nominating and Corporate Governance Committee.
  • Independence determination: The Board determined that Dr. Terlinde qualifies as an "independent director" under Nasdaq listing standards.
  • No special arrangements: The filing states there are no arrangements or understandings between Dr. Terlinde and any other person pursuant to which he was selected as a director.
  • No related person transactions: The filing reports no related person transactions between Dr. Terlinde and the company within the meaning of Item 404(a) of Regulation S-K.
  • Compensation: Dr. Terlinde will receive compensation in accordance with the company's standard arrangements for non-employee directors, as described in the definitive proxy statement filed March 27, 2026.

ADTRAN Holdings Expands Board with Election of Dr. Christian Terlinde

According to the filing, ADTRAN Holdings, Inc. (NASDAQ:ADTN) disclosed on October 29, 2026, that its Board of Directors took action on October 27, 2026, to increase the number of board seats from seven to eight and to fill the newly created seat by electing Christian Terlinde as a director. The action was unanimous and followed a recommendation from the Board's Nominating and Corporate Governance Committee.

The company disclosed that the Board has determined Dr. Terlinde qualifies as an "independent director" under Nasdaq listing standards. The filing further states that there are no arrangements or understandings between Dr. Terlinde and any other person pursuant to which he was selected, and that no related person transactions exist between Dr. Terlinde and the company within the meaning of Item 404(a) of Regulation S-K.

Regarding compensation, the filing states Dr. Terlinde will be compensated 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 SEC on March 27, 2026, as adjusted by the Board from time to time. The company also issued a press release on October 29, 2026, announcing the appointment, which the filing notes contains additional biographical information about Dr. Terlinde. The press release is attached to the filing as Exhibit 99.1. The filing was signed by Timothy Santo, Senior Vice President of Finance and Chief Financial Officer.

What Was Disclosed

ADTRAN Holdings reported the unanimous election of Christian Terlinde to its Board of Directors, effective October 27, 2026, expanding the board from seven to eight members. The filing confirmed his independent director status under Nasdaq listing standards and noted no related person transactions or special selection arrangements.