DUBLIN - Fran Rooney, the chief executive of Baltimore Technologies PLC, has resigned.

The July 10 announcement came less than a week after the Irish Internet security software firm said that it would make further significant reductions in its work force.

Paul Sanders, the company's chief financial officer, was named interim chief executive. Mr. Sanders said he would continue with the restructuring, including an unspecified number of layoffs announced July 5. A spokeswoman said the exact number of jobs to be cut from the company's current 1,200 will be announced in August.

"Our key priority for the immediate future is to work on the fundamental changes needed to restructure the business," said Mr. Sanders, who joined Baltimore Technologies in December.

The company began its restructuring in May, announcing that it would lay off 250 people, about 18% of its work force, with the goal of saving about $20 million a year.

The company said July 5 that it had cash reserves of about $76.7 million and did not need funding from the equity or debt markets. Instead, it said, it intends to make deep cost cuts and has not ruled out asset sales or plant closings.

Mr. Rooney, who was also deputy chairman, said that he was leaving to "pursue other interests," which include becoming chairman of an unidentified e-learning company and "involvement with a range of other companies."

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