Massachusetts regulators issued subpoenas Thursday to employees of Fidelity Investments, Morgan Stanley and Franklin Resources, extending their market-timing probe at Prudential Securities, Reuters reports. Spokespeople for the three firms that have just now come under the inspection of Mass. Secretary of the Commonwealth William Galvin confirmed that they have received these requests for information.

Prudential recently forced two managers from offices in New York and Garden City, N.Y., to resign.

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