Key facts
- This page summarizes Christoph Glingener's Form 4 filing for ADTRAN Holdings, Inc. (ADTN).
- 9 reported transactions and 4 derivative rows are listed below.
- Accepted by SEC: 11 May 2026, 16:00.
Christoph Glingener - 07 May 2026 Form 4 Insider Report for ADTRAN Holdings, Inc. (ADTN)
- Reporting relationship
- Chief Technology Officer
- Issuer ticker
- ADTN
- Reported as of
- 07 May 2026
- Net transaction value
- -$2,219,844
- SEC form
- 4
- Accepted by SEC
- 11 May 2026, 16:00:08 UTC
- Prior SEC filing
- 28 Jan 2025
- Next SEC filing
- 28 Jul 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Dan Ragsdale, by power of attorney
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Christoph Glingener filed Form 4 for ADTRAN Holdings, Inc. (ADTN) on 11 May 2026.
Change
- Previous filing in this sequence was filed on 28 Jan 2025.
- Current net transaction value: -$2,219,844.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001943622
Primary reporting owner
Glingener Christoph
- Relationship
- Chief Technology Officer
- Address
- C/O ADTRAN HOLDINGS, INC., 901 EXPLORER BOULEVARD, HUNTSVILLE
- Signature
- /s/ Dan Ragsdale, by power of attorney
- Signature date
- 11 May 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
ADTN
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +41,220
- Change %
- +88%
- Price
- $7.01*
- Shares after
- 87,865
- Date
- 07 May 2026
- Ownership
- Direct
- Footnotes
- F1
ADTN
transaction
Common Stock
Sale
- Transaction value
- $607,171
- Shares
- -41,220
- Change %
- -47%
- Price
- $14.73
- Shares after
- 46,645
- Date
- 07 May 2026
- Ownership
- Direct
- Footnotes
- F1, F2
ADTN
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +84,895
- Change %
- +182%
- Price
- $12.17*
- Shares after
- 131,540
- Date
- 07 May 2026
- Ownership
- Direct
- Footnotes
- F1
ADTN
transaction
Common Stock
Sale
- Transaction value
- $1,278,519
- Shares
- -84,895
- Change %
- -65%
- Price
- $15.06
- Shares after
- 46,645
- Date
- 07 May 2026
- Ownership
- Direct
- Footnotes
- F1, F3
ADTN
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +22,277
- Change %
- +48%
- Price
- $12.17*
- Shares after
- 68,922
- Date
- 08 May 2026
- Ownership
- Direct
- Footnotes
- F1
ADTN
transaction
Common Stock
Sale
- Transaction value
- $334,155
- Shares
- -22,277
- Change %
- -32%
- Price
- $15.00
- Shares after
- 46,645
- Date
- 08 May 2026
- Ownership
- Direct
- Footnotes
- F1, F4
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
ADTN
transaction
Derivative
Stock Option
Options Exercise
- Transaction value
- Shares
- -41,220
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 07 May 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 41,220
- Exercise price
- $7.01
- Footnotes
- F1, F5
ADTN
transaction
Derivative
Stock Options
Options Exercise
- Transaction value
- Shares
- -84,895
- Change %
- -79%
- Price
- $0.000000*
- Shares after
- 22,277
- Date
- 07 May 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 84,895
- Exercise price
- $12.17
- Footnotes
- F1, F5
ADTN
transaction
Derivative
Stock Option
Options Exercise
- Transaction value
- Shares
- -22,277
- Change %
- -100%
- Price
- $0.000000*
- Shares after
- 0
- Date
- 08 May 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 22,277
- Exercise price
- $12.17
- Footnotes
- F1, F5
ADTN
holding
Derivative
Stock Option
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 85,383
- Date
- 07 May 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 85,383
- Exercise price
- $19.08
- Footnotes
- F6
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Rule 10b5-1 trading plan
These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.
Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).
Explanation of responses 6 footnotes
Footnote F1
The transactions reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 12, 2025.
Footnote F2
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.355 to $15.69, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within this range.
Footnote F3
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.00 to $15.69, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within this range.
Footnote F4
These shares were sold in a single transaction at $15.00 per share.
Footnote F5
The stock option vested and was fully exercisable.
Footnote F6
The stock option vests on May 15, 2026, which is the fourth anniversary of the date of the grant.