HUNTSVILLE, Ala.–(BUSINESS WIRE)–ADTRAN Holdings, Inc. (NASDAQ: ADTN and FSE: QH9) (“ADTRAN Holdings” “ADTRAN” or the “Company”) today announced its unaudited financial results for the third quarter ended September 30, 2026. Revenue: $281.2 million, up 0.6 % year-over-year. GAAP gross margin of 38.5%; non-GAAP gross margin of 42.1%, including benefit of approximately 200 basis points from IEEPA1 refunds. GAAP operating margin of -0.3 %; non-GAAP operating margin of 5.0%. Net cash used in oper