The market’s worst three-year stretch in history has definitely taken its toll on the assets of the nation’s biggest fund companies. And no firms have been harder hit than the ones at the top.

Fidelity has bled $87 billion in assets in the last 12 months ended Jan. 31. Putnam has lost $45 billion, Janus has lost $38 billion, and in spite of the appeal of its index funds, Vanguard’s assets have declined by $34 billion, according to Financial Research Corp. of Boston.

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