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ADTRAN Holdings, Inc. — 8-K/A Filings

8 8-K/A filings on record

This page lists all 8-K/A filings submitted to the SEC by ADTRAN Holdings, Inc. (ADTN), sorted by most recent first. Each row links to the full filing on EdgarLookup. ADTRAN Holdings, Inc. has filed 8 8-K/A documents with the SEC since 2017. To view all SEC filings by ADTRAN Holdings, Inc., see the full filings list.

Overview All Filings Financials Insiders
All 10-K 10-K/A 10-K405 10-Q 10-Q/A 11-K 11-K/A 144 15-12G 25-NSE 3 3/A 4 4/A 425 5 8-K 8-K/A 8-K12B ARS ARS/A CORRESP CT ORDER DEF 14A DEFA14A DEFM14A DEFR14A EFFECT NT 10-K NT 10-Q PRE 14A S-3 S-3ASR S-8 S-8 POS SC 13D SC 13D/A SC 13G SC 13G/A SC TO-I SC TO-I/A SCHEDULE 13G SCHEDULE 13G/A SD UPLOAD
Form Description Accession Number Filed Period
8-K/A 8-K/A 0000950170-25-096408 Jul 17, 2025 Jul 16, 2025
8-K/A FORM 8-K/A 0001193125-23-212439 Aug 14, 2023 Aug 6, 2023
8-K/A 8-K/A 0001193125-23-209024 Aug 10, 2023 Aug 6, 2023
8-K/A 8-K/A 0000950170-22-023662 Nov 9, 2022 Nov 7, 2022
8-K/A 8-K/A 0001193125-22-268261 Oct 25, 2022 Oct 24, 2022
8-K/A 8-K/A 0000950170-22-019126 Sep 30, 2022 Jul 15, 2022
8-K/A 8-K/A 0001564590-21-009408 Feb 26, 2021 Feb 3, 2021
8-K/A ADTRAN, INC. 8-K/A 0001157523-07-000494 Jan 23, 2007 Jan 22, 2007