While Janus of Denver and Fidelity Investments of Boston have been struggling to attract assets, several other fund groups have picked up their slack and have climbed in overall fund sale standings, according to industry figures.

August was a weak month for both Janus and Fidelity, as flows sagged. Fidelity suffered a net outflow of $1.5 million, still an improvement over the firm's July flows, when the firm suffered a net outflow of $2.9 billion, according to data from Financial Research Corporation of Boston.

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