https://www.developersdigest.tech/markets/adtn/filings Latest company filings for ADTRAN Holdings, Inc. (ADTN) - annual reports, quarterly reports, major events, and insider trades, newest first. en Fri, 10 Jul 2026 21:49:10 GMT https://www.sec.gov/Archives/edgar/data/926282/000119312526236824/xslF345X06/ownership.xml 0001193125-26-236824 Fri, 22 May 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000195004726004824/xsl144X01/primary_doc.xml 0001950047-26-004824 Wed, 20 May 2026 12:00:00 GMT 144 https://www.sec.gov/Archives/edgar/data/926282/000119312526228208/adtn-20260513.htm 0001193125-26-228208 Mon, 18 May 2026 12:00:00 GMT 8-K https://www.sec.gov/Archives/edgar/data/926282/000119312526218337/26_specialized_disclosur.htm 0001193125-26-218337 Tue, 12 May 2026 12:00:00 GMT SD https://www.sec.gov/Archives/edgar/data/926282/000119312526216692/xslF345X06/ownership.xml 0001193125-26-216692 Mon, 11 May 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000195004726004202/xsl144X01/primary_doc.xml 0001950047-26-004202 Thu, 07 May 2026 12:00:00 GMT 144 https://www.sec.gov/Archives/edgar/data/926282/000119312526205276/adtn-20260331.htm 0001193125-26-205276 Tue, 05 May 2026 12:00:00 GMT 10-Q https://www.sec.gov/Archives/edgar/data/926282/000119312526204995/adtn-20260504.htm 0001193125-26-204995 Tue, 05 May 2026 12:00:00 GMT 8-K https://www.sec.gov/Archives/edgar/data/926282/000119312526200826/adtn-20260501.htm 0001193125-26-200826 Fri, 01 May 2026 12:00:00 GMT DEFA14A https://www.sec.gov/Archives/edgar/data/926282/000210012126000079/xslSCHEDULE_13G_X02/primary_doc.xml 0002100121-26-000079 Tue, 28 Apr 2026 12:00:00 GMT SCHEDULE 13G https://www.sec.gov/Archives/edgar/data/926282/000119312526145496/adtn-20260401.htm 0001193125-26-145496 Tue, 07 Apr 2026 12:00:00 GMT 8-K https://www.sec.gov/Archives/edgar/data/926282/000119312526142016/xslF345X06/ownership.xml 0001193125-26-142016 Fri, 03 Apr 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000119312526142013/xslF345X06/ownership.xml 0001193125-26-142013 Fri, 03 Apr 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000119312526142009/xslF345X06/ownership.xml 0001193125-26-142009 Fri, 03 Apr 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000119312526127649/adtn-2025_annual_report_.pdf 0001193125-26-127649 Fri, 27 Mar 2026 12:00:00 GMT ARS https://www.sec.gov/Archives/edgar/data/926282/000119312526127317/adtn-20260325.htm 0001193125-26-127317 Fri, 27 Mar 2026 12:00:00 GMT DEFA14A https://www.sec.gov/Archives/edgar/data/926282/000119312526127315/adtn-20260327.htm 0001193125-26-127315 Fri, 27 Mar 2026 12:00:00 GMT DEF 14A https://www.sec.gov/Archives/edgar/data/926282/000010290926000526/xslSCHEDULE_13G_X02/primary_doc.xml 0000102909-26-000526 Thu, 26 Mar 2026 12:00:00 GMT SCHEDULE 13G/A https://www.sec.gov/Archives/edgar/data/926282/000119312526119867/xslF345X06/ownership.xml 0001193125-26-119867 Mon, 23 Mar 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000173112226000445/xslSCHEDULE_13G_X02/primary_doc.xml 0001731122-26-000445 Wed, 18 Mar 2026 12:00:00 GMT SCHEDULE 13G/A https://www.sec.gov/Archives/edgar/data/926282/000119312526106086/adtn-20260313.htm 0001193125-26-106086 Fri, 13 Mar 2026 12:00:00 GMT PRE 14A https://www.sec.gov/Archives/edgar/data/926282/000119312526093954/xslF345X05/ownership.xml 0001193125-26-093954 Thu, 05 Mar 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000119312526093935/xslF345X05/ownership.xml 0001193125-26-093935 Thu, 05 Mar 2026 12:00:00 GMT 4/A https://www.sec.gov/Archives/edgar/data/926282/000195004726002159/xsl144X01/primary_doc.xml 0001950047-26-002159 Wed, 04 Mar 2026 12:00:00 GMT 144 https://www.sec.gov/Archives/edgar/data/926282/000119312526073878/adtn-20251231.htm 0001193125-26-073878 Thu, 26 Feb 2026 12:00:00 GMT 10-K https://www.sec.gov/Archives/edgar/data/926282/000119312526073361/adtn-20260225.htm 0001193125-26-073361 Thu, 26 Feb 2026 12:00:00 GMT 8-K https://www.sec.gov/Archives/edgar/data/926282/000119312526031745/xslF345X05/ownership.xml 0001193125-26-031745 Fri, 30 Jan 2026 12:00:00 GMT 4/A https://www.sec.gov/Archives/edgar/data/926282/000119312526027417/xslF345X05/ownership.xml 0001193125-26-027417 Wed, 28 Jan 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000119312526027411/xslF345X05/ownership.xml 0001193125-26-027411 Wed, 28 Jan 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000119312526024827/xslF345X05/ownership.xml 0001193125-26-024827 Tue, 27 Jan 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000119312526024818/xslF345X05/ownership.xml 0001193125-26-024818 Tue, 27 Jan 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000119312526019464/xslF345X05/ownership.xml 0001193125-26-019464 Thu, 22 Jan 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000119312526019455/xslF345X05/ownership.xml 0001193125-26-019455 Thu, 22 Jan 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000119312526018367/adtn-20260121.htm 0001193125-26-018367 Thu, 22 Jan 2026 12:00:00 GMT 8-K https://www.sec.gov/Archives/edgar/data/926282/000119312526002903/xslF345X05/ownership.xml 0001193125-26-002903 Mon, 05 Jan 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000119312526002902/xslF345X05/ownership.xml 0001193125-26-002902 Mon, 05 Jan 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000119312526002901/xslF345X05/ownership.xml 0001193125-26-002901 Mon, 05 Jan 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000119312526002900/xslF345X05/ownership.xml 0001193125-26-002900 Mon, 05 Jan 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000119312526002898/xslF345X05/ownership.xml 0001193125-26-002898 Mon, 05 Jan 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000119312526002897/xslF345X05/ownership.xml 0001193125-26-002897 Mon, 05 Jan 2026 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000119312525315910/adtn-20251209.htm 0001193125-25-315910 Thu, 11 Dec 2025 12:00:00 GMT 8-K https://www.sec.gov/Archives/edgar/data/926282/000119312525303492/xslF345X05/ownership.xml 0001193125-25-303492 Mon, 01 Dec 2025 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000119312525303491/xslF345X05/ownership.xml 0001193125-25-303491 Mon, 01 Dec 2025 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000119312525295709/xslF345X05/ownership.xml 0001193125-25-295709 Tue, 25 Nov 2025 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000119312525288074/xslF345X05/ownership.xml 0001193125-25-288074 Wed, 19 Nov 2025 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000119312525288073/xslF345X05/ownership.xml 0001193125-25-288073 Wed, 19 Nov 2025 12:00:00 GMT 4 https://www.sec.gov/Archives/edgar/data/926282/000164572125000021/xslSCHEDULE_13G_X01/primary_doc.xml 0001645721-25-000021 Fri, 14 Nov 2025 12:00:00 GMT SCHEDULE 13G/A https://www.sec.gov/Archives/edgar/data/926282/000119312525264157/adtn-20250930.htm 0001193125-25-264157 Tue, 04 Nov 2025 12:00:00 GMT 10-Q https://www.sec.gov/Archives/edgar/data/926282/000119312525263524/adtn-20251103.htm 0001193125-25-263524 Tue, 04 Nov 2025 12:00:00 GMT 8-K https://www.sec.gov/Archives/edgar/data/926282/000119312525211271/adtn-20250919.htm 0001193125-25-211271 Mon, 22 Sep 2025 12:00:00 GMT 8-K