Baltimore Technologies PLC, an information security company that is listed on the London Stock Exchange, said it has filed for an initial public offering on the Nasdaq national market.

The company, which is trying to grow internationally on a foundation of digital certificate technologies that it has sold primarily in Europe, would offer 8.5 million American depository shares. That would be in addition to the 30.2 million shares trading on the London exchange, where the price on Friday, the equivalent of $19.93, was up 12% for the week.

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