The Pioneer Group of Boston issued a proxy statement last week saying the firm had received a second round of bids from prospective buyers and urging shareholders to support the existing board in a proxy vote May 16, to insure that a newly elected board does not jeopardize a sale.

Lens Investment Management of Portland, Maine, is waging a proxy contest to gain control of five seats on the Pioneer's board of directors. Lens holds 4.1 percent of Pioneer's stock.

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