Carl Icahn’s purchase of Nuance Communications Inc. shares is spurring speculation he will seek a break-up or sale of the speech-recognition software developer.

Nuance surged 5.7 percent on April 2 after Icahn’s 9.3 percent stake was revealed, resurrecting a stock that plunged 19 percent on Feb. 8. The slump -- which drove Nuance’s price- earnings ratio to the lowest level since 2009, according to data compiled by Bloomberg -- was prompted by the $6.5 billion company cutting its forecast due to health-care and personal computer-related sales.

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