Kirby McInerney LLP announced an investigation into ADTRAN Holdings, Inc. concerning potential violations of federal securities laws. The investigation follows ADTRAN's July 22, 2026 preliminary second-quarter results, which reported revenue of $280 million to $282 million and a non-GAAP operating margin of about 3.5% to 4.0%, falling below the company's prior guidance of $283 million to $303 million in revenue and a 5% to 9% non-GAAP operating margin. Chairman and CEO Tom Stanton attributed the shortfall to a project delay from a single customer and elevated component and freight costs. On the news, ADTRAN stock declined by $1.69 per share, or approximately 14%, to close at $10.45 per share on July 22, 2026. The law firm stated that no lawsuit has been filed and the investigation is ongoing to determine whether claims may be brought under federal securities laws.
ADTRAN IncADTRAN reported preliminary Q2 revenue and operating margin below prior guidance, causing a 14% stock decline.