ADTRAN Holdings, Inc. INVESTOR ALERT: Kirby McInerney LLP Announces Investigation Into Potential Securities Fraud

Law firm Kirby McInerney LLP is investigating ADTRAN Holdings for potential securities fraud following the company's announcement of preliminary Q2 2026 results that significantly missed guidance. ADTRAN reported revenue of $280-282 million and non-GAAP operating margin of 3.5-4.0%, falling short of prior guidance of $283-303 million revenue and 5-9% margin. The company attributed the miss to a project delay from a single customer and elevated component/freight costs. ADTRAN stock declined 14% on the news.