ADTRAN Holdings, Inc. (ADTN) SEC Filings

ADTRAN Holdings, Inc. (ADTN) SEC EDGAR filings (8-K, 10-Q, DEF 14A, 10-K, 8-K/A, 10-K/A), newest first; latest 8-K filed 2026-08-10. Every filing links to the canonical SEC document. First-party data.

SEC filings — source: EDGAR

Filed	Form	Title
2026-08-10	8-K	8-K filed 2026-08-10 by ADTRAN Holdings, Inc.
2026-08-04	8-K	8-K filed 2026-08-04 by ADTRAN Holdings, Inc.
2026-08-04	10-Q	10-Q filed 2026-08-04 by ADTRAN Holdings, Inc.
2026-07-23	8-K	8-K filed 2026-07-23 by ADTRAN Holdings, Inc.
2026-07-22	8-K	8-K filed 2026-07-22 by ADTRAN Holdings, Inc.
2026-06-26	8-K	8-K filed 2026-06-26 by ADTRAN Holdings, Inc.
2026-05-18	8-K	8-K filed 2026-05-18 by ADTRAN Holdings, Inc.
2026-05-05	10-Q	10-Q filed 2026-05-05 by ADTRAN Holdings, Inc.
2026-05-05	8-K	8-K filed 2026-05-05 by ADTRAN Holdings, Inc.
2026-04-07	8-K	8-K filed 2026-04-07 by ADTRAN Holdings, Inc.
2026-03-27	DEF 14A	DEF 14A filed 2026-03-27 by ADTRAN Holdings, Inc.
2026-02-26	8-K	8-K filed 2026-02-26 by ADTRAN Holdings, Inc.
2026-02-26	10-K	10-K filed 2026-02-26 by ADTRAN Holdings, Inc.
2026-01-22	8-K	8-K filed 2026-01-22 by ADTRAN Holdings, Inc.
2025-12-11	8-K	8-K filed 2025-12-11 by ADTRAN Holdings, Inc.
2025-11-04	10-Q	10-Q filed 2025-11-04 by ADTRAN Holdings, Inc.
2025-11-04	8-K	8-K filed 2025-11-04 by ADTRAN Holdings, Inc.
2025-09-22	8-K	8-K filed 2025-09-22 by ADTRAN Holdings, Inc.
2025-09-17	8-K	8-K filed 2025-09-17 by ADTRAN Holdings, Inc.
2025-08-05	8-K	8-K filed 2025-08-05 by ADTRAN Holdings, Inc.
2025-08-05	10-Q	10-Q filed 2025-08-05 by ADTRAN Holdings, Inc.
2025-07-30	8-K	8-K filed 2025-07-30 by ADTRAN Holdings, Inc.
2025-07-17	8-K/A	8-K/A filed 2025-07-17 by ADTRAN Holdings, Inc.
2025-05-28	8-K	8-K filed 2025-05-28 by ADTRAN Holdings, Inc.
2025-05-27	8-K	8-K filed 2025-05-27 by ADTRAN Holdings, Inc.
2025-05-20	10-K/A	10-K/A filed 2025-05-20 by ADTRAN Holdings, Inc.
2025-05-20	10-Q	10-Q filed 2025-05-20 by ADTRAN Holdings, Inc.
2025-05-13	8-K	8-K filed 2025-05-13 by ADTRAN Holdings, Inc.
2025-05-12	8-K	8-K filed 2025-05-12 by ADTRAN Holdings, Inc.
2025-05-08	8-K	8-K filed 2025-05-08 by ADTRAN Holdings, Inc.

ADTN overview · ADTN earnings · ADTN financials · ADTN KPIs · ADTN investor relations · ADTN ownership · ADTN peers

Data sourced from U.S. SEC EDGAR. Not personalized investment advice.