The National Association of Securities Dealers is following up on a Prudential internal probe that found some managers and brokers had forged documents in order to switch clients from one annuity to another, thus boosting sales results.

Bob DeFillippo, a Prudential spokesman, said the NASD investigation came after the internal investigation found irregularities in less than 1,000 contracts sold from 1998 to 2002. The irregularities included falsifying customer signatures.

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