Although the increasing value of Janus Capital Group's stock is good news for its market capitalization, now at $4.8 billion, and a sign that investors believe the company is improving its performance, the stock's 50% run-up since October has had at least one negative drawback, The Wall Street Journal reports.

With its shares trading at $22.27 as of the close of last week, the price of Janus' stock has put management's planned buyout of the firm out of reach.

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