X0407 4 2023-05-18 0 0001082324 VirnetX Holding Corp VHC 0001241556 O'BRIEN THOMAS M C/O 308 DORLA COURT SUITE 206 ZEPHYR COVE NV 89448 1 0 0 0 0 Common Stock 2023-05-18 4 P 0 50000 0.42 A 238327 D The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $0.418 to $0.43, inclusive. Upon request by the Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares purchased at each separate price within the range set forth in this Form 4. /s/ Kendall Larsen, Attorney-in-fact for Thomas M. O'Brien 2023-05-19