Aristotle Fund LP Has Upped Office Depot Stake by $1.34 Million; Market Value Rose; Ghost Tree Capital Increased Position in Alexion Pharmaceuticals by $7.70 Million as Shares Declined Ken Greenberg increased its stake in Alexion Pharmaceuticals Inc by 122.22% based on its latest 2017Q3 regulatory filing with the SEC. Ghost Tree Capital Llc bought 55,000 shares as the company's stock declined 11.63% while stock markets rallied.
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