Fidelity Investments reported Thursday that one-third of all of the Roth IRA conversions it handled for advisers and individual investors occurred in December.

For the full year, Fidelity handled 22,000 conversions, four times the number that they were in 2009. And advisers and investors used Fidelity’s Roth Conversion Evaluator tool 197,000 times during the year. Since its launch in October 2009, it has been accessed 260,000 times.

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