Strong performance and a conservative approach has enabled American Century Investments to outperform some of its competitors, despite market conditions that cost it 31.4% of its assets under management last year.

Enrique Chang, the Kansas City, Mo., mutual fund company's chief investment officer, said its international equity, bond, and asset allocation funds were strong performers last year. American Century had $70.1 billion of assets under management as of Dec. 31. Mr. Chang said the company remains relatively successful, despite the outflows, because it has remained committed to fundamental analysis.

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