American Funds, a unit of Los Angeles-based Capital Group Cos., pulled in the most amount of money among mutual fund companies in January with net inflows of $8.4 billion, according to research released by Financial Research Corp. on Tuesday. It was followed by the Vanguard Group with $6.2 billion and exchange-traded fund manager Barclays Global Investors with $2.9 billion.

Large fund companies that were involved in improper trading activities saw severe withdrawals in January. Putnam experienced net outflows of $2.5 billion and Janus Capital Group lost $2.3 billion.

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