Current reports
8-K
Cost Associated with Exit or Disposal Activities
17 Apr 24
8-K
Results of Operations and Financial Condition
15 Mar 24
8-K
ADTRAN Holdings, Inc. reports preliminary fourth quarter 2023 financial results
27 Feb 24
8-K
Non-Reliance on Previously Issued Financial Statements or a Related Audit Report or Completed Interim Review
20 Feb 24
8-K
Entry into a Material Definitive Agreement
22 Jan 24
8-K
Departure of Directors or Certain Officers
6 Dec 23
8-K
Departure of Directors or Certain Officers
5 Dec 23
8-K
ADTRAN Holdings, Inc. reports third quarter 2023 financial results and announces business efficiency program
7 Nov 23
8-K
Departure of Directors or Certain Officers
24 Oct 23
8-K
ADTRAN Holdings announces preliminary results for the third quarter of 2023
17 Oct 23
Registration and prospectus
S-3ASR
Automatic shelf registration
23 Dec 22
15-12G
Securities registration termination
21 Jul 22
S-8
Registration of securities for employees
11 Jul 22
S-8
Registration of securities for employees
11 Jul 22
8-K12B
Notification of registration of securities
11 Jul 22
25-NSE
Exchange delisting
11 Jul 22
S-8 POS
Registration of securities for employees (post-effective amendment)
8 Jul 22
S-8 POS
Registration of securities for employees (post-effective amendment)
8 Jul 22
S-8 POS
Registration of securities for employees (post-effective amendment)
8 Jul 22
S-8 POS
Registration of securities for employees (post-effective amendment)
8 Jul 22
Proxies
DEFA14A
Additional proxy soliciting materials
4 Apr 24
DEFA14A
Additional proxy soliciting materials
27 Mar 24
DEF 14A
Definitive proxy
27 Mar 24
DEFA14A
Additional proxy soliciting materials
2 May 23
DEFA14A
Additional proxy soliciting materials
28 Mar 23
DEF 14A
Definitive proxy
28 Mar 23
DEFA14A
Additional proxy soliciting materials
29 Mar 22
DEF 14A
Definitive proxy
29 Mar 22
DEFM14A
Proxy related to merger
2 Dec 21
DEFA14A
Additional proxy soliciting materials
30 Mar 21
Other
SD
Conflict minerals disclosure
26 May 23
SD
Conflict minerals disclosure
27 May 22
SD
Conflict minerals disclosure
21 May 21
SD
Conflict minerals disclosure
28 May 20
SD
Conflict minerals disclosure
30 May 19
SD
Conflict minerals disclosure
31 May 18
UPLOAD
Letter from SEC
31 Oct 17
CORRESP
Correspondence with SEC
18 Oct 17
CORRESP
Correspondence with SEC
18 Sep 17
UPLOAD
Letter from SEC
12 Sep 17
Ownership
SC 13G
Divisar Capital Management LLC
25 Mar 24
SC 13G
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
12 Feb 24
SC 13G/A
VANGUARD GROUP INC
12 Feb 24
SC 13G/A
VANGUARD GROUP INC
12 Feb 24
4
James Denson Wilson Jr
30 Jan 24
4
Christoph Glingener
30 Jan 24
4
Ulrich Dopfer
30 Jan 24
4
THOMAS R STANTON
30 Jan 24
4
James Denson Wilson Jr
23 Jan 24
4
THOMAS R STANTON
23 Jan 24