Back in 2005, the chances that Amvescap, now Invesco, would make a 360-degree turnaround seemed virtually impossible, but with a little bit of time and the addition of Martin Flanagan as chief executive officer, the unlikely actually occurred.

After the former protege of renowned investor Sir John Templeton took the reins of Amvescap, loyal investors have witnessed the company's stock price more than double, to trade at roughly 15.7 times ahead of forward earnings, Institutional Investor reports.

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