Putnam Investments of Boston is considering creating a new type of cloned fund sensitive to capital gains taxes, said Gordon Forrester, managing director at Putnam.

The new cloned funds, which Putnam is calling "serialized funds," would be created when an existing fund achieves a high level of unrealized capital gains of perhaps 25 percent or more of the fund's total value, Forrester said. Putnam would then close that original fund to new investors and create a clone, or serialized fund, Forrester said.

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