Putnam Investments is estimated to have seen $642 million of cash pulled from its stock and bond mutual funds in April, the biggest cash outflow of the top 25 U.S. fund firms of that month, Reuters reports.

Financial Research Corp., the financial service consulting firm, estimated Putnam, the fifth-biggest fund firm in the U.S., had a $1.25 billion withdrawal in March, and year-to-date outflows of $4.68 billion, topping the biggest 25 U.S. fund firms.

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