ADTRAN Holdings, Inc.
For the period ended Dec 31, 2025. Filed Feb 26, 2026.
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FY2025 · Filed Feb 26, 2026
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Item 9B. Other Information
(a) None.
(b) Dr. Christoph Glingener, our Chief Technology Officer, adopted a Rule 10b5-1 trading arrangement (as defined in Item 408 of Regulation S-K) on December 12, 2025. Dr. Glingener’s trading arrangement covers the exercise of 148,392 stock options and the sale of the underlying shares of the Company’s common stock, and it is scheduled toterminate on the earlier of (i)December 31, 2026 and (ii) the date that all such options are exercised and the underlying shares are sold.
Other than as disclosed above, during the fiscal quarter ended December 31, 2025, none of the Company’s directors or executive officers adopted orterminated any contract, instruction or written plan for the purchase or sale of Company securities that was intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) or any “non-Rule 10b5-1 trading arrangement” as defined in Item 408 of Regulation S-K.
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