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ADTRAN Holdings, Inc.

For the period ended Jun 30, 2026. Filed Aug 4, 2026.

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A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Jun 30, 2026 · Filed Aug 4, 2026

ADTN$4.29+6.2%Stored close · as of Nov 9, 2026

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Item 5. Other Information

(a) Not applicable

(b) Not applicable

(c) Insider Trading Arrangements

James D. Wilson, Jr., our Chief Revenue Officer, adopted a Rule 10b5-1 trading arrangement (as defined in Item 408 of Regulation S-K) on May 19, 2026. Mr. Wilson's trading arrangement covers the sale of 56,068 shares of the Company’s common stock, and it is scheduled toterminate on the earlier of (i)May 31, 2027 and (ii) the date that all shares are sold.

Other than as disclosed above, during the fiscal quarter ended June 30, 2026, 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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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.