Company: VHC
Filing Date: 2025-04-25
Form Type: DEFA14A
Source: 0001140361-25-015751
Chunk: 0

Company: VirnetX Holding Corp
Filing Date: 2025-04-25
Form: DEFA14A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant☐ Check the appropriate box:

| ☐ | ​ | ​ | Preliminary Proxy Statement                                                     |
| ☐ | ​ | ​ | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| ☐ | ​ | ​ | Definitive Proxy Statement                                                      |
| ☒ | ​ | ​ | Definitive Additional Materials                                                 |
| ☐ | ​ | ​ | Soliciting Material Pursuant to §240.14a-11(c) or §240.14a-2                    |

| VirnetX Holding Corporation                                              |
| (Name of Registrant as Specified In Its Charter)                         |
| (Name of Person(s) Filing Proxy Statement, if other than the Registrant) |

Payment of Filing Fee (Check all boxes that apply):

| ☒ | ​ | ​ | No fee required                                                                                     |
| ☐ | ​ | ​ | Fee paid previously with preliminary materials                                                      |
| ☐ | ​ | ​ | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11 |