SEC Filings
Search SEC EDGAR filings by company ticker and form type
arrow_back
ADTRAN Holdings, Inc.
DEFA14A
14 filings
All DEFA14A Filings
Complete history of DEFA14A filings with the SEC
| Date Filed | View on EDGAR |
|---|---|
|
01
May
May 01, 2026
|
open_in_new View Filing |
|
27
Mar
Mar 27, 2026
|
open_in_new View Filing |
|
06
Jun
Jun 06, 2025
|
open_in_new View Filing |
|
27
May
May 27, 2025
|
open_in_new View Filing |
|
13
May
May 13, 2025
|
open_in_new View Filing |
|
31
Mar
Mar 31, 2025
|
open_in_new View Filing |
|
04
Apr
Apr 04, 2024
|
open_in_new View Filing |
|
27
Mar
Mar 27, 2024
|
open_in_new View Filing |
|
03
May
May 03, 2023
|
open_in_new View Filing |
|
28
Mar
Mar 28, 2023
|
open_in_new View Filing |
|
29
Mar
Mar 29, 2022
|
open_in_new View Filing |
|
30
Mar
Mar 30, 2021
|
open_in_new View Filing |
|
13
Apr
Apr 13, 2020
|
open_in_new View Filing |
|
02
Apr
Apr 02, 2020
|
open_in_new View Filing |