ADTRAN Holdings, Inc.
ADTN- Exchange
- Nasdaq
- Industry
- Telephone & Telegraph Apparatus
- SEC CIK
- 0000926282
In the last 90 days, ADTRAN Holdings, Inc. insiders filed 1 open-market purchase and 0 sales; 249 institutions reported holding it in 13F filings for Q2 2026, worth $1.17B in total; no superinvestor holds it.
Holders of 5% or more of ADTN
Holders whose latest Schedule 13D or 13G filing reports 5% or more of ADTRAN Holdings, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Vanguard Portfolio Management LLC | 13G | 6.03%4.87M shares | New | Apr 28, 20261 filing | Apr 28, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
12 Schedule 13D and 13G filings on ADTRAN Holdings, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Apr 28, 20263:54 PM ET | Vanguard Portfolio Management LLC | 13G | 6.03%4.87M shares | New | Mar 31, 2026 | SEC |
| Mar 26, 20263:12 PM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | −10.20 ppfrom 10.20%Below 5% | Mar 13, 2026 | SEC |
| Mar 18, 202612:07 PM ET | Egora Ventures AG | 13G/A | 4.97%4.01M shares | −1.75 ppfrom 6.73%Below 5% | Feb 2, 2026 | SEC |
| Nov 14, 20252:43 PM ET | Divisar Capital Management LLCand 1 other | 13G/A | 4.00%3.21M shares | −1.30 ppfrom 5.30%Below 5% | Sep 30, 2025 | SEC |
| Aug 14, 20253:28 PM ET | Divisar Capital Management LLCand 1 other | 13G/A | 5.30%4.23M shares | +1.00 ppfrom 4.30% | Jun 30, 2025 | SEC |
| Jul 7, 20251:20 PM ET | Vanguard Group Inc | 13G/A | 10.20%8.17M shares | – | Jun 30, 2025 | SEC |
| May 15, 202511:41 AM ET | Divisar Capital Management LLCand 2 others | 13G/A | 4.30%3.43M shares | −1.80 ppfrom 6.10%Below 5% | Mar 31, 2025 | SEC |
| May 9, 20254:54 PM ET | William Blair Investment Management, LLC | 13G/A | 4.20%3.35M shares | –Below 5% | Mar 31, 2025 | SEC |
| Apr 23, 202511:35 AM ET | DnB Asset Management AS | 13G/A | 4.40%3.55M shares | –Below 5% | Mar 31, 2025 | SEC |
| Mar 6, 202510:39 AM ET | Egora Ventures AG | 13G | 6.73%5.36M shares | New | Feb 14, 2025 | SEC |
| Feb 14, 202511:13 AM ET | Divisar Capital Management LLCand 2 others | 13G/A | 6.10%4.81M shares | −1.60 ppfrom 7.70% | Dec 31, 2024 | SEC |
| Nov 14, 202412:07 PM ET | Divisar Capital Management LLCand 2 others | 13G/A | 7.70%6.08M shares | – | Sep 30, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell ADTRAN Holdings, Inc. shares.
No Form 144 notices for ADTRAN Holdings, Inc. are on file.