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Zix Corporation Joins Russell 3000 Index

DALLAS--(BUSINESS WIRE)--June 28, 2004--Zix Corporation (ZixCorp(R)), (Nasdaq:ZIXI), a global provider of e-messaging protection and transaction services, today announced it was added to the Russell 3000(R) Index on June 25 when the broad-market index was reconstituted. Annual reconstitution of the Russell indexes captures the 3,000 largest U.S. stocks as of the end of May, ranking them by total market capitalization to create the Russell 3000.

Membership in Russell's 21 U.S. equity indexes is determined primarily by market capitalization rankings and style attributes. Russell indexes are widely used by managers for index funds and as benchmarks for both passive and active investment strategies. More than $360 billion is invested in funds based solely on Russell's indexes and an additional $850 billion is benchmarked to them. Investment managers who oversee these funds purchase shares of member stocks according to that company's weighting in the particular index.

"We're pleased that ZixCorp has been added to the Russell 3000," said John A. Ryan, chief executive officer for ZixCorp. "As institutional interest continues to increase in the e-prescribing and secure messaging sectors -- the primary businesses of ZixCorp -- being listed on the Russell 3000 helps focus investor attention on our achievements and assists us in our goal of greater institutional ownership of our stock."

"I hope that investors see that through our accomplishments to date, such as participating in the largest e-prescribing initiatives in the country, and continuing to win the majority of secure messaging decisions in the healthcare sector, that we've built a strong platform for growth and have created significant shareholder value," Ryan added. "The addition of ZixCorp to the Russell Index is yet another indicator of our continuing success."

About Russell

Russell, a global leader in multi-manager investment services, provides investment products and services in more than 35 countries. Russell manages more than $107 billion in assets and advises clients worldwide representing 1.8 trillion. Founded in 1936, Russell is a subsidiary of Northwestern Mutual and is headquartered in Tacoma, Wash., with additional offices in New York, Toronto, London, Paris, Singapore, Sydney, Auckland, and Tokyo. For more information, go to

About Zix Corporation

Zix Corporation is a global provider of e-messaging protection and transaction services. ZixCorp offers a range of solutions to protect organizations from viruses, spam, and electronic attack, as well as enabling secure electronic communications, such as email encryption, e-prescribing, on-line doctor visits, and electronic lab results. ZixCorp helps organizations of any size to streamline operations, reduce risks, and leverage the efficiencies of e-messaging. For more information, visit

CONTACT: Zix Corporation, Dallas
Public Relations:
Kim Tompkins, 214-515-7338
Investor Relations:
Peter Wilensky, 214-515-7357

SOURCE: Zix Corporation