ADTN SHAREHOLDER ALERT: ADTRAN Holdings, Inc. Investors Encouraged to Contact Kirby McInerney LLP About Potential Securities Laws Violations

ADTN SHAREHOLDER ALERT: ADTRAN Holdings, Inc. Investors Encouraged to Contact Kirby McInerney LLP About Potential Securities Laws Violations

The law firm of Kirby McInerney LLP reminds investors of its investigation on behalf ADTRAN Holdings, Inc. (“ADTRAN” or the “Company”) (NASDAQ: ADTN) investors concerning the Company’s and/or members of its senior management’s possible violation of the federal securities laws or other unlawful business practices.

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What Happened?

On July 22, 2026, ADTRAN announced preliminary Q2 2026 revenue of $280 million to $282 million and non-GAAP operating margin of about 3.5% to 4.0%, below the Company’s prior guidance of $283 million to $303 million in revenue and non-GAAP operating margin of 5% to 9%. In ADTRAN’s press release announcing preliminary results, Tom Stanton, Chairman and CEO, said “Our preliminary second quarter results were directly impacted by a project delay from a single customer. In addition, margins reflected the current elevated component and freight cost environment.”