Billionaire investor Carl Icahn boosted his stake in WebMD Health Corp. WBMD to 11.6%, according to a filing Wednesday with the Securities and Exchange Commission. Shares rose 3.4% to $27.18 in recent after-hours trading. The stock was down 52% over the past 12 months through Wednesday's close. Icahn is well known for shaking up board rooms and pushing for change at companies whose stocks he …
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