ADTRAN Holdings, Inc. announces certain preliminary fourth quarter and full year 2025 results

HUNTSVILLE, Ala.--(BUSINESS WIRE)--ADTRAN Holdings, Inc. (NASDAQ: ADTN and FSE: QH9) (“ADTRAN Holdings” or the “Company”) today announced preliminary unaudited revenue, as well as GAAP and non-GAAP operating margin, for the fiscal quarter and year ended December 31, 2025. This press release announcement is being provided due to German ad hoc disclosure requirements following, among others, the Company's expected outperformance relative to its previously issued revenue guidance. All figures in t