GLINGENER CHRISTOPH (CEO of ADVA) sold 76.1% of their position (148.39K shares) of ADTRAN HOLDINGS, INC. on the open market

Open‑market sale worth $2.22M — a major position exit. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 3 sales

GLINGENER CHRISTOPH

Filed: 5/11/2026ACC: 0001193125-26-216692

InsiderGLINGENER CHRISTOPHCIK 1943622

→

IssuerADTRAN HOLDINGS, INC.CIK 926282

Officer· CEO of ADVA

Since Sep 2022

-148.39K

Net shares

Net seller

$2.22M

Total sold

Open market trades

0B · 3S

Total transactions

148.39K acquired · 296.78K disposed

Non-Derivative Transactions6

Common Stock

Direct

M · Option Exercise

+41.22K

Price / share

$7.01

Trade value

$288.95K

% of position

88.4%

5/7/2026

46.65K→87.86K

Common Stock

Direct

S · Sale

−41.22K

Price / share

$14.73

Trade value

$607.17K

% of position

46.9%

5/7/2026

87.86K→46.65K

Common Stock

Direct

M · Option Exercise

+84.89K

Price / share

$12.17

Trade value

$1.03M

% of position

182.0%

5/7/2026

46.65K→131.54K

Common Stock

Direct

S · Sale

−84.89K

Price / share

$15.06

Trade value

$1.28M

% of position

64.5%

5/7/2026

131.54K→46.65K

Common Stock

Direct

M · Option Exercise

+22.28K

Price / share

$12.17

Trade value

$271.11K

% of position

47.8%

5/8/2026

46.65K→68.92K

Common Stock

Direct

S · Sale

−22.28K

Price / share

$15.00

Trade value

$334.15K

% of position

32.3%

5/8/2026

68.92K→46.65K

Total

Net shares

+0.00

Net value

-$626.61K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	5/7/2026	M · Option Exercise	+41.22K	$7.01	$288.95K	88.4%	46.65K	87.86K
Common Stock Direct	5/7/2026	S · Sale	−41.22K	$14.73	$607.17K	46.9%	87.86K	46.65K
Common Stock Direct	5/7/2026	M · Option Exercise	+84.89K	$12.17	$1.03M	182.0%	46.65K	131.54K
Common Stock Direct	5/7/2026	S · Sale	−84.89K	$15.06	$1.28M	64.5%	131.54K	46.65K
Common Stock Direct	5/8/2026	M · Option Exercise	+22.28K	$12.17	$271.11K	47.8%	46.65K	68.92K
Common Stock Direct	5/8/2026	S · Sale	−22.28K	$15.00	$334.15K	32.3%	68.92K	46.65K
Total			+0.00		-$626.61K

Derivative Transactions3

Stock Option

Direct

M · Option Exercise

Converts to

Common Stock

41.22K shares

−41.22K

Strike price

7.01

Held after

0.00

Exercisable

—

5/7/2026

Stock Options

Direct

M · Option Exercise

Converts to

Common Stock

84.89K shares

−84.89K

Strike price

12.17

Held after

22.28K

Exercisable

—

5/7/2026

Stock Option

Direct

M · Option Exercise

Converts to

Common Stock

22.28K shares

−22.28K

Strike price

12.17

Held after

0.00

Exercisable

—

5/8/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Option Direct	Common Stock41.22K shares	5/7/2026	M · Option Exercise	−41.22K	7.01	—	0.00
Stock Options Direct	Common Stock84.89K shares	5/7/2026	M · Option Exercise	−84.89K	12.17	—	22.28K
Stock Option Direct	Common Stock22.28K shares	5/8/2026	M · Option Exercise	−22.28K	12.17	—	0.00

Non-Derivative Holdings (Post-Transaction)0

No non-derivative holdings reported

Derivative Holdings (Post-Transaction)1

Stock Option

Direct

Underlying security

Common Stock

Underlying shares

85.38K

Shares owned

85.38K

Exercise price

19.08

Expiration

—

Exercise window

—

Total

Underlying

85.38K

Owned

85.38K

Security	Underlying	Exercise Price	Exercise Window	Expiration	Underlying Shares	Shares Owned
Stock Option Direct	Common Stock	19.08	—	—	85.38K	85.38K
Total					85.38K	85.38K