VirnetX Set to Join Russell Microcap Index

SCOTTS VALLEY, CA (June 25, 2008) - VirnetX Holding Corporation (AMEX: VHC), a leader in secure real-time communications and collaborations technology, will be included in the Russell Microcap Index when Russell Investments reconstitutes its family of U.S. indexes on June 27, according to a preliminary list of additions posted June 13, 2008 on www.russell.com

Introduced in 2005, the Russell Microcap Index measures the performance of the microcap segment of the U.S. equity markets and includes 1,000 of the smallest securities in the small-cap Russell 2000® Index and the next 1,000 securities – in descending order by market cap – trading on national exchanges. The index offers analysts, portfolio managers and other investors a comprehensive, unbiased benchmark by which to compare their performance.

VirnetX President and CEO Kendall Larsen commented, "We are pleased of our inclusion in the Russell Indexes. This represents another important step in growing our presence and visibility in the investment community, the exposure gained from our listing will help our ongoing efforts to bring the VirnetX story to a wider audience of institutional investors."

Russell indexes are widely used by investment managers and institutional investors as benchmarks. Currently, more than $4.4 trillion is managed by institutional investors who use Russell indexes as benchmarks to guide their decision-making for both passive and active investment strategies.

About Russell
Russell Investments provides strategic advice, world-class implementation, state-of-the-art performance benchmarks and a range of institutional-quality investment products. Russell has more than $213 billion in assets under management as of March 31, 2008, and serves individual, institutional and advisor clients in more than 40 countries. Founded in 1936, Russell is a subsidiary of The Northwestern Mutual Life Insurance Company.

About VirnetX
VirnetX Holding Corporation, a secure real-time communications and collaboration technology company, is engaged in commercializing its patent portfolio by developing a licensing program, as well as developing software products designed to create a secure environment for real-time communications such as instant messaging and Voice over Internet Protocol. For more information, visit www.virnetx.com.

Safe Harbor Agreement
Statements in this press release that are not statements of historical or current fact constitute "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Such forward-looking statements involve known and unknown risks, uncertainties and other unknown factors that could cause the actual results of VirnetX to be materially different from the historical results or from any future results expressed or implied by such forward-looking statements. The forward-looking statements contained herein include, without limitation, statements relating to the litigation process and potential outcome. In addition to statements which explicitly describe such risks and uncertainties, readers are urged to consider statements labeled with the terms "believes," "belief," "expects," "intends," "anticipates," "will," or "plans" to be uncertain and forward-looking. The forward-looking statements contained herein are also subject generally to other risks and uncertainties that are described from time to time in VirnetX's reports and registration statements filed with the Securities and Exchange Commission.

Contacts

Rudy Barrio (Investors)
Allen & Carron
212.691.8087
r.barrio@allencarron.com

Sameer Mathur
VirnetX Holding Company
831.438.8200
sameer_mathur@virnetx.com

Brian Kennedy (Media)
Allen & Carron
212.691.8087
brian@allencarron.com