ADTRAN Holdings ADTN SEC Filings

NASDAQ ADTN
$6.68 +0.11 (+1.60%)
As of: Oct 21, 2026 · 3:59 PM EDT
EDGAR Disclosures

SEC Filings

Source SEC EDGAR

Every SEC filing ADTRAN Holdings, Inc. (ADTN) has made, as reported on EDGAR — annual and quarterly reports, current reports, insider transactions and ownership disclosures. Filter by form group, form type or period, and open any filing or its index directly.

Form Type
# Form Type Form Group Accession Date Filing Index
14Insider Transaction0001193125-26-342317Aug 10, 2026 8:01 PM
28-KCurrent Report0001193125-26-342359Aug 10, 2026 4:06 PM
34Insider Transaction0001193125-26-340206Aug 7, 2026 8:00 PM
410-QQuarterly & Annual Report0001193125-26-331632Aug 4, 2026 8:43 AM
58-KCurrent Report0001193125-26-331458Aug 4, 2026 6:36 AM
64Insider Transaction0001193125-26-320947Jul 28, 2026 8:01 PM
78-KCurrent Report0001193125-26-314198Jul 23, 2026 8:30 PM
88-KCurrent Report0001193125-26-311290Jul 22, 2026 11:02 AM
9S-3ASROthers0001193125-26-307471Jul 17, 2026 6:12 PM
104Insider Transaction0001193125-26-296161Jul 6, 2026 8:02 PM
113Insider Transaction0001193125-26-292752Jul 1, 2026 8:52 PM
1211-KOthers0001193125-26-285745Jun 26, 2026 9:29 PM
138-KCurrent Report0001193125-26-283882Jun 26, 2026 11:02 AM
14144Insider Transaction0001950047-26-004824May 20, 2026 8:18 PM
158-KCurrent Report0001193125-26-228208May 18, 2026 10:10 AM
16SDOthers0001193125-26-218337May 12, 2026 1:32 PM
174Insider Transaction0001193125-26-216692May 11, 2026 8:00 PM
184Insider Transaction0001193125-26-216692May 11, 2026 8:00 PM
194Insider Transaction0001193125-26-216692May 11, 2026 8:00 PM
2010-QQuarterly & Annual Report0001193125-26-205276May 5, 2026 9:08 AM
218-KCurrent Report0001193125-26-204995May 5, 2026 7:00 AM
22DEFA14AOthers0001193125-26-200826May 1, 2026 5:50 PM
23SCHEDULE 13GBeneficial Ownership Report0002100121-26-000079Apr 28, 2026 7:54 PM
248-KCurrent Report0001193125-26-145496Apr 7, 2026 8:00 PM
254Insider Transaction0001193125-26-142016Apr 3, 2026 7:16 PM
264Insider Transaction0001193125-26-142016Apr 3, 2026 7:16 PM
274Insider Transaction0001193125-26-142016Apr 3, 2026 7:16 PM
284Insider Transaction0001193125-26-142013Apr 3, 2026 7:15 PM
294Insider Transaction0001193125-26-142013Apr 3, 2026 7:15 PM
304Insider Transaction0001193125-26-142013Apr 3, 2026 7:15 PM
314Insider Transaction0001193125-26-142009Apr 3, 2026 7:13 PM
324Insider Transaction0001193125-26-142009Apr 3, 2026 7:13 PM
334Insider Transaction0001193125-26-142009Apr 3, 2026 7:13 PM
34ARSOthers0001193125-26-127649Mar 27, 2026 12:20 PM
35DEFA14AOthers0001193125-26-127317Mar 27, 2026 10:55 AM
36DEF 14AOthers0001193125-26-127315Mar 27, 2026 10:54 AM
37SCHEDULE 13GBeneficial Ownership Report0000102909-26-000526Mar 26, 2026 7:12 PM
384Insider Transaction0001193125-26-119867Mar 23, 2026 8:42 PM
39SCHEDULE 13GBeneficial Ownership Report0001731122-26-000445Mar 18, 2026 4:07 PM
40SCHEDULE 13GBeneficial Ownership Report0001731122-26-000445Mar 18, 2026 4:07 PM
41SCHEDULE 13GBeneficial Ownership Report0001731122-26-000445Mar 18, 2026 4:07 PM
42PRE 14AOthers0001193125-26-106086Mar 13, 2026 8:01 PM
434Insider Transaction0001193125-26-093954Mar 5, 2026 9:10 PM
444Insider Transaction0001193125-26-093954Mar 5, 2026 9:10 PM
454Insider Transaction0001193125-26-093954Mar 5, 2026 9:10 PM
464Insider Transaction0001193125-26-093935Mar 5, 2026 9:07 PM
47144Insider Transaction0001950047-26-002159Mar 4, 2026 9:27 PM
48144Insider Transaction0001950047-26-002159Mar 4, 2026 9:27 PM
49144Insider Transaction0001950047-26-002159Mar 4, 2026 9:27 PM
5010-KQuarterly & Annual Report0001193125-26-073878Feb 26, 2026 2:26 PM
...

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