Key facts
- This page summarizes Thomas M. O'Brien's Form 4 filing for VirnetX Holding Corp (VHC).
- 2 reported transactions and 1 derivative row are listed below.
- Accepted by SEC: 03 Dec 2025, 18:36.
Thomas M. O'Brien - 03 Dec 2025 Form 4 Insider Report for VirnetX Holding Corp (VHC)
- Reporting relationship
- Director
- Issuer ticker
- VHC
- Reported as of
- 03 Dec 2025
- Net transaction value
- +$6,315
- SEC form
- 4
- Accepted by SEC
- 03 Dec 2025, 18:36:23 UTC
- Prior SEC filing
- 16 Jun 2025
- Next SEC filing
- 08 Jun 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Kendall Larsen, Attorney-in-fact for Thomas M. O'Brien
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Thomas M. O'Brien filed Form 4 for VirnetX Holding Corp (VHC) on 03 Dec 2025.
Change
- Previous filing in this sequence was filed on 16 Jun 2025.
- Current net transaction value: +$6,315.
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 0001241556
Primary reporting owner
O'BRIEN THOMAS M
- Relationship
- Director
- Address
- C/O 308 DORLA COURT, SUITE 206, ZEPHYR COVE
- Signature
- /s/ Kendall Larsen, Attorney-in-fact for Thomas M. O'Brien
- Signature date
- 03 Dec 2025
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
VHC
transaction
Common Stock
Options Exercise
- Transaction value
- $6,315
- Shares
- +625
- Change %
- +2.3%
- Price
- $10.10
- Shares after
- 27,957
- Date
- 03 Dec 2025
- Ownership
- Direct
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
VHC
transaction
Derivative
Stock Option (Right to Buy)
Options Exercise
- Transaction value
- $0
- Shares
- -625
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 03 Dec 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 625
- Exercise price
- $10.10
- Footnotes
- F1
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 1 footnote
Footnote F1
The shares subject to the option were fully vested and exercisable, and reflects the Issuer's 1-for-20 reverse stock split effected October 25, 2023.