Nexa Technologies Named Among Leading Firms in the Securities Technology 50 Ranking

Irvine, CA - 18 October 2006

Places 10th Among Front-Office Vendors in a Study Conducted By Securities Industry News and Financial Insights

Nexa Technologies, Inc. (www.nexatech.com), a leading provider of advanced trading solutions and subsidiary of Penson Worldwide, Inc. (NASDAQ: PNSN), today announced that it ranks 10th in the Securities Technology 50, a survey of top front-office vendors conducted by Securities Industry News in conjunction with the independent research firm, Financial Insights, an IDC company.

The study, which ran as a supplement to the October 16, 2006 issue of Securities Industry News, represents the first of what is slated to become an annual ranking examining the size, growth and prospects of various vendors across the capital markets technology sector. This year’s survey examined the number of installed desktops; a quantifiable statistic and figure correlated roughly with market share. Each year’s ranking will look at a different area of the industry with the goal of providing an extensive overview of the total securities marketplace.

“It is exciting to be recognized as a leading technology firm in such a prestigious survey that takes into account our competitors and industry peers,” said Eric Stoop, President, Nexa Technologies. “Our ranking reveals to the industry what our customers already know; that we are a leader in the financial technology marketplace. I am proud to see the extent to which our desktop installations have penetrated the market and have confirmation that our product line of trading platforms, connectivity, and market data appeals to a wide range of clientele.”

“We are very proud of Nexa’s rise in stature in the financial technology industry,” adds Daniel P. Son, President and Co-Founder, Penson Worldwide. “Nexa’s technology plays an important role in our clearing businesses, and yet they continue to grow as an independent provider of technology as well.”

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