ADTRAN Holdings, Inc. (ADTN)
Nasdaq: ADTN · Telephone & Telegraph Apparatus · Huntsville, AL · filing with the SEC since 1996
Grade4.8
◀ Past 3.4● Present 5.0▶ Future 6.0
Who owns ADTRAN Holdings, Inc.
As filed with the SECHolders of 5% or more
1
Vanguard Portfolio Management holds 6.03% of Common Stock, as its SCHEDULE 13G filed Apr 28, 2026 says.
Directors and officers
12
report now, of 31 people on the record since 2006. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 1 named at left.
Holders of 5% or moreshare of the class, as filed
Vanguard Portfolio Management
SCHEDULE 13G · filed Apr 28, 2026 · Common Stock
EGORA Ventures AG
SCHEDULE 13G/A · filed Mar 18, 2026 · Common Stock · reported falling below 5%, from 6.73% in Mar 6, 2025
DnB Asset Management AS
SCHEDULE 13G/A · filed Apr 23, 2025 · Common Stock, Par Value $0.01 per share · reported falling below 5%
William Blair Investment Management, LLC
SCHEDULE 13G/A · filed May 9, 2025 · Common Stock · reported falling below 5%
Divisar Capital Management LLC
SCHEDULE 13G/A · filed Nov 14, 2025 · Common Stock, par value $0.01 · reported falling below 5%, from 5.3% in Aug 14, 2025
The Vanguard Group
SCHEDULE 13G/A · filed Mar 26, 2026 · Common Stock · reported falling below 5%, from 10.2% in Jul 7, 2025
What ADTN reports owning in othersstakes of 5% or more, and other ties
Other ties the annual report names
Company and Subsidiaries
An entity · legal entity · owns, named in the 10-K filed Feb 26, 2026
Foreign Subsidiaries
An entity · co registrant · owns, named in the 10-K filed Feb 26, 2026
Adtran Networks SE
A company bought · acquisition · owns, named in the 10-K filed Feb 26, 2026
48 subsidiaries in 27 countries, from the list filed with the 10-K filed Feb 26, 2026.
Insider tradesForm 4
5sales
7purchases
3sales on a scheduled plan
3people selling
$2.5Msold, in dollars
$1.3Mbought, in dollars
Open-market trades on Form 4 from Nov 12, 2025 to Nov 12, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Nov 12, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window6 of 31 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Glingener Christoph | Chief Technology Officer | 3 | $2.2M | 3 | 0 | $0 |
| Wilson James Denson Jr | Chief Revenue Officer | 1 | $100,000 | 0 | 0 | $0 |
| Jacqueline Hourigan Rice | director | 1 | $100,000 | 0 | 0 | $0 |
| Stanton Thomas R | Chairman & CEO | 0 | $0 | 0 | 3 | $1.1M |
| Santo Timothy P | SVP of Finance; CFO | 0 | $0 | 0 | 3 | $200,000 |
| Theodosopoulos Nikos | director | 0 | $0 | 0 | 1 | $100,000 |