CTO equity award at ADTRAN Holdings (NASDAQ: ADTN) adds 9,384 shares

Rhea-AI Filing Summary

ADTRAN Holdings, Inc. reported that Chief Technology Officer Christoph Glingener acquired 9,384 shares of common stock on July 24, 2026 through the vesting of performance stock units granted on May 24, 2023 under the Amended and Restated ADTRAN Holdings, Inc. 2020 Employee Stock Incentive Plan. Following this equity award, he directly holds 56,029 shares.

Insider Trade Summary

Net Buyer: 9,384 shares

Net Buy 1 txn

Insider Glingener Christoph

Role Chief Technology Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock F1	9,384	$0.00	$0.00

Holdings After Transaction: Common Stock — 56,029 shares (Direct)

Footnotes (1)

1. F1. These shares represent the vesting of performance stock units that were awarded pursuant to a grant on May 24, 2023 under the Amended and Restated ADTRAN Holdings, Inc. 2020 Employee Stock Incentive Plan.

Key Figures

Shares acquired: 9,384 shares of Common Stock Transaction price: $0.0000 per share Post-transaction holdings: 56,029 shares +1 more

4 metrics

Shares acquired 9,384 shares of Common Stock Grant/award acquisition reported on July 24, 2026

Transaction price $0.0000 per share Equity award vesting of performance stock units into common stock

Post-transaction holdings 56,029 shares Direct ownership by Christoph Glingener after the vesting transaction

Transaction date 2026-07-24 Date the common stock acquisition from PSU vesting was recorded

Key Terms

performance stock units, Amended and Restated ADTRAN Holdings, Inc. 2020 Employee Stock Incentive Plan, vesting

3 terms

performance stock units financial

"These shares represent the vesting of performance stock units that were awarded"

Performance stock units are a type of company award that grants employees shares of stock only if certain performance goals are met. They motivate employees to work toward specific company achievements, aligning their interests with those of shareholders. For investors, they can influence a company's future stock supply and reflect management’s confidence in reaching key targets.

Amended and Restated ADTRAN Holdings, Inc. 2020 Employee Stock Incentive Plan financial

"awarded pursuant to a grant on May 24, 2023 under the Amended and Restated"

vesting financial

"These shares represent the vesting of performance stock units that were awarded"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/28/2026 - 04:02 PM Accepted by SEC EDGAR 07/28/2026 - 04:01 PM Learn about SEC filing dates

FAQ

What insider transaction did ADTRAN (ADTN) report for CTO Christoph Glingener?

CTO Christoph Glingener acquired 9,384 shares of ADTRAN common stock on July 24, 2026, from the vesting of performance stock units granted on May 24, 2023 under the company’s 2020 Employee Stock Incentive Plan.

How many ADTRAN (ADTN) shares does CTO Christoph Glingener hold after this Form 4 transaction?

After the reported vesting, Christoph Glingener directly holds 56,029 shares of ADTRAN common stock. This total reflects his position following the acquisition of 9,384 shares from the vested performance stock units.

What was the price per share for Christoph Glingener's ADTRAN (ADTN) stock acquisition?

The 9,384 ADTRAN shares were recorded at a transaction price of $0.00 per share. This reflects that the shares were received through equity compensation via vesting of performance stock units, not purchased in an open-market transaction.

Which equity plan covered Christoph Glingener’s recent ADTRAN (ADTN) stock vesting?

The vesting relates to performance stock units granted under the Amended and Restated ADTRAN Holdings, Inc. 2020 Employee Stock Incentive Plan. This plan governs the equity award that resulted in Glingener receiving 9,384 shares of common stock.

Was Christoph Glingener’s ADTRAN (ADTN) Form 4 transaction made under a Rule 10b5-1 trading plan?

The filing’s Rule 10b5-1 checkbox is unchecked, so the transaction was not affirmatively reported as executed under a pre-arranged Rule 10b5-1 trading plan. No footnote indicates any such plan for this award vesting.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Glingener Christoph

(Last) (First) (Middle)

C/O ADTRAN HOLDINGS, INC.

901 EXPLORER BOULEVARD

(Street)

HUNTSVILLE ALABAMA 35806-2807

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
ADTRAN Holdings, Inc. [ ADTN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Technology Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/24/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	07/24/2026		A(1)		9,384	A	$0	56,029	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. These shares represent the vesting of performance stock units that were awarded pursuant to a grant on May 24, 2023 under the Amended and Restated ADTRAN Holdings, Inc. 2020 Employee Stock Incentive Plan.

	/s/ Dan Ragsdale, by power of attorney	07/28/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)