Defendant
6 cases as defendant.
VirnetX Holding Corporation (NASDAQ: VHC) is a publicly traded internet security software and technology company founded in 2005 and headquartered in Zephyr Cove, Nevada. VirnetX is a small company, reporting 21 employees as of December 2025 and annual revenue of $162,000 for the same year. Its market capitalization was approximately $56 million as of April 2026.
The company's business model is centered on commercializing its patent portfolio, which relates to secure communications, Zero Trust Network Access (ZTNA), and secure domain name technology. While VirnetX markets security products such as the VirnetX One platform, VirnetX Matrix, and the War Room secure video conferencing application, its revenue from operations is minimal compared to the income generated from patent litigation and licensing. The company's primary business activity has been described as the licensing and litigation of its intellectual property, which was developed in-house and acquired from Science Applications International Corporation (SAIC).
Consistent with a patent-assertion business model, VirnetX is almost exclusively a plaintiff in litigation. The provided case data shows the company as a plaintiff in three out of four tracked cases, with all district court suits filed in the patent-friendly U.S. District Court for the Eastern District of Texas. This reflects a strategy of aggressively enforcing its patent rights against major technology companies. The single case where VirnetX is listed as a defendant is an action at the Patent Trial and Appeal Board (PTAB), a common venue where companies accused of infringement challenge the validity of asserted patents.
VirnetX is known for its long-running and high-stakes patent infringement lawsuits against major technology corporations. Its most notable cases have been against Apple, where juries awarded VirnetX hundreds of millions of dollars in damages for the infringement of its patents by features like FaceTime and VPN on Demand. The company also engaged in litigation with Microsoft, which resulted in a $200 million settlement, and has sued other major firms, including Cisco. While VirnetX has secured significant verdicts and settlements, some of its patents have subsequently been invalidated in PTAB proceedings.
Black Swamp IP, LLC filed an IPR against VirnetX Inc. on U.S. Patent No. 7,921,211; instituted Sept. 9, 2016; final written decision; terminated Oct. 7, 2022.
Inter partes reexamination of US 8,051,181 with Apple Inc. as third-party requester. VirnetX appealed to the Federal Circuit (No. 16-1480), which affirmed the PTAB's invalidity findings on Dec. 9, 2016.
Apple petitioned for inter partes review of the '697 patent. The PTAB instituted review and issued a final written decision on 2015-05-11 finding claims 1–11, 14–25, and 28–30 unpatentable over Wesinger (US 5,898,830) and RFC 2543 (SIP). This was the alternative ground.
Inter partes review proceedings where the PTAB found several claims of U.S. Patent 6,502,135 to be unpatentable. This decision was subsequently appealed by VirnetX.
An Inter Partes Review (IPR) proceeding filed at the Patent Trial and Appeal Board (PTAB) concerning US Patent 7490151, with VirnetX Inc. as the implied patent owner. The proceeding resulted in a Final Written Decision.
Unified Patents filed IPR petitions IPR2014-00485 and IPR2014-00486 against the '181 patent. They are listed on the Google Patents litigation record as not instituted – procedural.