The U.S. Attorney's Office in Boston has charged a second man in the rapid trading and subsequent cover-up scheme at Prudential Securities.

Martin J. Druffner, 36, of Hopkinton, Mass., was charged last week in an Information with four counts of wire fraud and four counts of securities fraud. Earlier this month, Skifter Ajro, 37, of Milford, Mass., was similarly charged. He pleaded guilty and will be sentenced in November.

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