Directors’ Dealings | 13 May 2026 17:43

Adtran Holdings, Inc.: Christoph Glingener, Sale of 126,115 shares in ADTRAN Holdings, Inc. (ISIN US00486H1059) Due to their large number, the individual transactions to be reported under number 4 lit. c) of this notification are split across three publications. This is the third of those three publications. The aggregated information under section 4 lit. d) of this notification refers to all individual transactions from all three publications.

Notification and public disclosure of transactions by persons discharging managerial responsibilities and persons closely associated with them

13.05.2026 / 17:43 CET/CEST
The issuer is solely responsible for the content of this announcement.

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

a) Name

Title:
First name:	Christoph
Last name(s):	Glingener

2. Reason for the notification

a) Position / status

Position: Chief Technology Officer

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

Sale of 126,115 shares in ADTRAN Holdings, Inc. (ISIN US00486H1059) Due to their large number, the individual transactions to be reported under number 4 lit. c) of this notification are split across three publications. This is the third of those three publications. The aggregated information under section 4 lit. d) of this notification refers to all individual transactions from all three publications.

c) Price(s) and volume(s)

Price(s)	Volume(s)
15.00 USD	1,500.00 USD
15.00 USD	2,265.00 USD
15.00 USD	2,205.00 USD
15.00 USD	3,795.00 USD
15.00 USD	2,205.00 USD
15.00 USD	2,265.00 USD
15.00 USD	3,735.00 USD
15.00 USD	2,265.00 USD
15.00 USD	1,470.00 USD
15.00 USD	615.00 USD
15.00 USD	1,830.00 USD
15.00 USD	1,410.00 USD
15.00 USD	1,500.00 USD
15.00 USD	255.00 USD
15.00 USD	2,985.00 USD
15.00 USD	15.00 USD
15.00 USD	2,970.00 USD
15.00 USD	30.00 USD
15.00 USD	270.00 USD
15.00 USD	1,500.00 USD
15.00 USD	570.00 USD
15.00 USD	930.00 USD
15.00 USD	570.00 USD
15.00 USD	930.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,140.00 USD
15.00 USD	255.00 USD
15.00 USD	120.00 USD
15.00 USD	225.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,080.00 USD
15.00 USD	1,665.00 USD
15.00 USD	3,570.00 USD
15.00 USD	1,500.00 USD
15.00 USD	165.00 USD
15.00 USD	1,455.00 USD
15.00 USD	765.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	2,295.00 USD
15.00 USD	2,490.00 USD
15.00 USD	3,390.00 USD
15.00 USD	1,875.00 USD
15.00 USD	4,890.00 USD
15.00 USD	405.00 USD
15.00 USD	705.00 USD
15.00 USD	1,140.00 USD
15.00 USD	1,110.00 USD
15.00 USD	750.00 USD
15.00 USD	15.00 USD
15.00 USD	150.00 USD
15.00 USD	11,565.00 USD
15.00 USD	1,185.00 USD
15.00 USD	315.00 USD
15.00 USD	1,500.00 USD
15.00 USD	2,790.00 USD
15.00 USD	1,500.00 USD
15.00 USD	3,105.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,815.00 USD
15.00 USD	1,185.00 USD
15.00 USD	315.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,815.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	5,850.00 USD
15.00 USD	1,500.00 USD
15.00 USD	3,000.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	750.00 USD
15.00 USD	750.00 USD
15.00 USD	750.00 USD
15.00 USD	1,500.00 USD
15.00 USD	750.00 USD
15.01 USD	28,509.50 USD
15.00 USD	705.00 USD
15.01 USD	19,521.51 USD
15.01 USD	22,507.50 USD
15.00 USD	1,500.00 USD
15.00 USD	15.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,140.00 USD
15.00 USD	360.00 USD
15.00 USD	1,500.00 USD
15.00 USD	15,780.00 USD
15.00 USD	1,500.00 USD
15.00 USD	3,225.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,350.00 USD
15.00 USD	360.00 USD
15.00 USD	570.00 USD
15.00 USD	360.00 USD
15.00 USD	210.00 USD
15.00 USD	540.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	750.00 USD
15.00 USD	750.00 USD
15.00 USD	750.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	210.00 USD
15.00 USD	18,465.00 USD
15.04 USD	5,715.20 USD
15.03 USD	5,709.50 USD
15.04 USD	1,504.00 USD
15.04 USD	75.20 USD
15.04 USD	1,504.00 USD
15.04 USD	1,504.00 USD
15.04 USD	300.80 USD
15.04 USD	300.80 USD
15.04 USD	1,504.00 USD
15.03 USD	1,503.00 USD
15.03 USD	1,503.00 USD
15.03 USD	4,509.00 USD
15.03 USD	1,503.00 USD
15.03 USD	1,503.00 USD
15.04 USD	180.42 USD
15.03 USD	1,503.00 USD
15.03 USD	1,503.00 USD
15.03 USD	300.60 USD
15.03 USD	1,503.00 USD
15.03 USD	1,503.00 USD
15.01 USD	1,501.00 USD
15.01 USD	30.02 USD
15.01 USD	1,501.00 USD
15.01 USD	225.15 USD
15.01 USD	330.22 USD
15.01 USD	1,501.00 USD
15.01 USD	330.22 USD
15.01 USD	1,501.00 USD
15.01 USD	1,501.00 USD
15.01 USD	690.46 USD
15.01 USD	135.09 USD
15.01 USD	150.10 USD
15.01 USD	5,253.50 USD
15.00 USD	1,500.00 USD
15.00 USD	75.00 USD
15.00 USD	465.00 USD
15.00 USD	75.00 USD
15.00 USD	150.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	10,500.00 USD
15.00 USD	1,110.00 USD
15.00 USD	1,500.00 USD
15.00 USD	11,415.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	390.00 USD
15.00 USD	1,305.00 USD
15.00 USD	690.00 USD
15.00 USD	435.00 USD
15.00 USD	4,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	4,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	405.00 USD
15.00 USD	1,095.00 USD
15.00 USD	1,095.00 USD
15.00 USD	1,095.00 USD
15.00 USD	1,095.00 USD
15.00 USD	1,500.00 USD
15.00 USD	255.00 USD
15.00 USD	1,245.00 USD
15.00 USD	1,500.00 USD
15.00 USD	34,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,005.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,305.00 USD
15.00 USD	7,500.00 USD
15.00 USD	5,700.00 USD
15.00 USD	5,700.00 USD
15.01 USD	4,501.50 USD
15.02 USD	4,506.00 USD
15.02 USD	6,008.00 USD
15.03 USD	4,792.98 USD
15.04 USD	13,531.50 USD
15.04 USD	6,467.20 USD
15.04 USD	6,467.20 USD
15.04 USD	5,715.20 USD
15.01 USD	4,953.30 USD
15.01 USD	4,503.00 USD
15.01 USD	4,503.00 USD
15.03 USD	4,509.00 USD
15.03 USD	691.38 USD
15.04 USD	797.12 USD
15.04 USD	4,512.00 USD
15.04 USD	3,008.00 USD
15.04 USD	2,210.88 USD
15.05 USD	1,505.00 USD
15.05 USD	180.60 USD
15.05 USD	1,324.40 USD
15.07 USD	4,519.50 USD
15.05 USD	4,513.50 USD
15.09 USD	1,433.55 USD
15.09 USD	1,509.00 USD
15.09 USD	1,509.00 USD
15.09 USD	2,504.94 USD
15.09 USD	1,509.00 USD
15.09 USD	588.51 USD
15.13 USD	1,513.00 USD
15.13 USD	317.73 USD
15.13 USD	1,195.27 USD
15.13 USD	1,513.00 USD
15.13 USD	1,513.00 USD
15.15 USD	621.15 USD
15.15 USD	3,454.20 USD
15.15 USD	1,984.65 USD
15.16 USD	1,500.84 USD
15.13 USD	5,144.20 USD
15.14 USD	757.00 USD
15.13 USD	30.26 USD
15.13 USD	60.52 USD
15.12 USD	665.28 USD
15.13 USD	6,808.50 USD
15.13 USD	6,808.50 USD
15.11 USD	60.44 USD
15.11 USD	453.30 USD
15.10 USD	75.50 USD
15.10 USD	921.10 USD
15.12 USD	6,801.75 USD
15.09 USD	271.62 USD
15.09 USD	845.04 USD
15.09 USD	392.34 USD
15.09 USD	6,790.50 USD
15.09 USD	4,527.00 USD
15.09 USD	754.50 USD
15.10 USD	19,192.10 USD
15.11 USD	12,103.11 USD
15.10 USD	5,979.60 USD
15.11 USD	6,797.25 USD
15.09 USD	1,509.00 USD
15.09 USD	1,509.00 USD
15.09 USD	437.61 USD
15.09 USD	1,509.00 USD
15.08 USD	60.32 USD
15.07 USD	1,507.00 USD
15.07 USD	301.40 USD
15.07 USD	1,507.00 USD
15.07 USD	6,736.29 USD
15.08 USD	75.40 USD
15.09 USD	1,509.00 USD
15.08 USD	30.16 USD
15.08 USD	15.08 USD
15.08 USD	754.00 USD
15.08 USD	3,845.40 USD
15.08 USD	2,819.96 USD
15.08 USD	754.00 USD
15.08 USD	15.08 USD
15.08 USD	2,262.00 USD
15.07 USD	1,507.00 USD
15.07 USD	1,491.93 USD
15.09 USD	6,939.10 USD
15.09 USD	6,941.40 USD
15.05 USD	1,038.45 USD
15.05 USD	15.05 USD
15.05 USD	301.00 USD
15.05 USD	150.50 USD
15.05 USD	45.15 USD
15.04 USD	1,458.88 USD
15.05 USD	1,504.50 USD
15.04 USD	15.04 USD
15.04 USD	15.04 USD
15.04 USD	15.04 USD
15.04 USD	90.24 USD
15.04 USD	75.20 USD
15.04 USD	15.04 USD
15.04 USD	15.04 USD
15.03 USD	1,262.52 USD
15.03 USD	1,503.00 USD
15.03 USD	1,503.00 USD
15.03 USD	60.12 USD
15.03 USD	1,442.88 USD
15.04 USD	1,504.00 USD
15.03 USD	1,503.00 USD
15.02 USD	7,059.40 USD
15.02 USD	345.46 USD
15.02 USD	345.46 USD
15.02 USD	811.08 USD
15.00 USD	1,500.00 USD
15.01 USD	60.04 USD
15.01 USD	30.02 USD
15.00 USD	1,410.00 USD
15.01 USD	120.08 USD
15.01 USD	60.04 USD
15.00 USD	1,320.00 USD
15.01 USD	1,200.80 USD
15.01 USD	30.02 USD
15.01 USD	45.03 USD
15.00 USD	225.00 USD
15.00 USD	1,500.00 USD
15.00 USD	7,050.00 USD
15.00 USD	6,300.00 USD
15.00 USD	6,000.00 USD
15.01 USD	5,058.37 USD
15.01 USD	945.63 USD
15.00 USD	7,200.00 USD
15.01 USD	6,004.00 USD
15.03 USD	7,064.10 USD
15.03 USD	7,064.10 USD
15.03 USD	4,509.00 USD
15.03 USD	7,064.10 USD
15.03 USD	4,509.00 USD
15.03 USD	7,061.75 USD
15.03 USD	4,509.00 USD
15.03 USD	5,709.50 USD
15.03 USD	7,061.75 USD
15.03 USD	18,036.00 USD
15.03 USD	1,503.00 USD
15.03 USD	1,503.00 USD
15.02 USD	1,502.00 USD
15.02 USD	150.20 USD
15.02 USD	120.16 USD
15.02 USD	766.02 USD
15.02 USD	45.06 USD
15.02 USD	225.30 USD
15.02 USD	150.20 USD
15.02 USD	15.02 USD
15.02 USD	300.40 USD
15.02 USD	5,257.00 USD
15.02 USD	1,502.00 USD
15.02 USD	1,502.00 USD
15.01 USD	360.24 USD
15.01 USD	45.03 USD
15.01 USD	1,501.00 USD
15.01 USD	300.20 USD
15.01 USD	1,501.00 USD
15.01 USD	1,501.00 USD
15.01 USD	1,501.00 USD
15.01 USD	1,501.00 USD
15.01 USD	1,786.19 USD
15.01 USD	1,501.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	150.00 USD
15.00 USD	810.00 USD
15.00 USD	1,500.00 USD
15.00 USD	45.00 USD
15.00 USD	3,000.00 USD
15.00 USD	1,965.00 USD
15.00 USD	4,035.00 USD
15.00 USD	6,000.00 USD
15.00 USD	4,185.00 USD
15.00 USD	300.00 USD
15.00 USD	12,000.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	3,000.00 USD
15.00 USD	1,500.00 USD
15.00 USD	1,500.00 USD
15.00 USD	12,000.00 USD
15.00 USD	1,500.00 USD
15.00 USD	5,700.00 USD
15.00 USD	9,000.00 USD

d) Aggregated information

Price	Aggregated volume
14.95 USD	1,885,662.54 USD

e) Date of the transaction

07/05/2026; UTC−4

f) Place of the transaction

Name:	NASDAQ
MIC:	XNAS

13.05.2026 CET/CEST The EQS Distribution Services include Regulatory Announcements, Financial/Corporate News and Press Releases.

Language:	English
Company:	Adtran Holdings, Inc.
	901 Explorer Boulevard
	35806 Huntsville
	United States
Internet:	www.adtran.com

End of News EQS News Service

104874  13.05.2026 CET/CEST