ADTRAN Holdings, Inc. announces certain preliminary second quarter 2026 results

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HUNTSVILLE, Ala.--(BUSINESS WIRE)--ADTRAN Holdings, Inc. (NASDAQ: ADTN and FSE: QH9) (“ADTRAN Holdings” or the “Company”) today announced preliminary unaudited revenue, preliminary GAAP and non-GAAP operating margin, and preliminary GAAP and non-GAAP basic and diluted earnings per share for the fiscal quarter ended June 30, 2026. This press release announcement is being provided due to German ad hoc disclosure requirements following, among others, the Company's performance relative to its previ