Adtran Holdings, Inc.: Thomas R. Stanton, Acquisition of 134,336 shares in ADTRAN Holdings, Inc. (ISIN US00486H1059) due to the settlement of 225,774.593 phantom shares under the Employee ...

1. Details of the person discharging managerial responsibilities / person closely associated

a) Name

Title:
First name:	Thomas R.
Last name(s):	Stanton

2. Reason for the notification

a) Position / status

Position:

Chief Executive Officer and Chairman of the Board of Directors

b) Initial notification

3. Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor

a) Name

Adtran Holdings, Inc.

b) LEI

549300VV36J86CRRWF77

4. Details of the transaction(s)

a) Description of the financial instrument, type of instrument, identification code

Type:	Share
ISIN:	US00486H1059

b) Nature of the transaction

Acquisition of 134,336 shares in ADTRAN Holdings, Inc. (ISIN US00486H1059) due to the settlement of 225,774.593 phantom shares under the Employee Equity Deferred Compensation Program of ADTRAN Holdings, Inc. in accordance with the termination of the Employee Equity Deferred Compensation Program. A total number of 91,438.593 shares in ADTRAN Holdings, Inc. (ISIN US00486H1059) were withheld by ADTRAN Holdings, Inc. to cover the taxes.

c) Price(s) and volume(s)

Price(s)	Volume(s)
not numberable	not numberable

d) Aggregated information

Price	Aggregated volume
not numberable	not numberable

e) Date of the transaction

03/11/2026; UTC?6

f) Place of the transaction

Outside a trading venue