Is ALXN a good stock to own? Find out who bought Alexion Pharmaceuticals, who sold Alexion Pharmaceuticals (ALXN) stock, and who holds a large position in Alexion Pharmaceuticals.

• T. Rowe Price Associates owns 18.03M shares worth $1.66B
• Jennison Associates owns 10.01M shares worth $922.09M
• Vanguard owns 8.83M shares worth $813.34M
• Wells Fargo & Company owns 8.03M shares worth $797.28M
• STATE STREET CORPORATION owns 7.79M shares worth $718.20M
• JPMORGAN CHASE & CO owns 4.23M shares worth $420.27M
• American Century Companies owns 3.29M shares worth $302.94M
• Ameriprise Financial owns 3.17M shares worth $315.07M
• Inves owns 2.28M shares worth $210.33M
• Artisan Partners Limited Partnership owns 2.09M shares worth $192.48M
• Artisan Partners Holdings owns 1.65M shares worth $77.78M
• Norges Bank Investment Management owns 1.52M shares worth $142.42M
• Geode Capital Management owns 1.30M shares worth $119.89M
• Turner Investments owns 1.27M shares worth $145.70M
• Columbus Circle Investors owns 1.15M shares worth $108.21M
• Name Goodman & Company, Investment Counsel owns 1.13M shares worth $103.41M
• Bank of America Corporation owns 1.13M shares worth $105.88M
• Renaissance Technologies owns 1.12M shares worth $111.28M
• Rainier Investment Management owns 1.09M shares worth $101.17M
• GOLDMAN SACHS owns 1.00M shares worth $92.51M
• Waddell & Reed Financial owns 999101 shares worth $92.06M
• Franklin Resources owns 997479 shares worth $93.57M
• Columbia Wanger Asset Management owns 941000 shares worth $88.28M
• DSM Capital Partners owns 882943 shares worth $81.35M
• Ionic Capital Management owns 841500 shares worth $60.17M
• CITADEL ADVISORS owns 840025 shares worth $77.40M
• New York State Common Retirement Fund owns 817034 shares worth $76.65M
• Navellier & Associates owns 805001 shares worth $92.09M
• OppenheimerFunds owns 802980 shares worth $74.56M

• Viking Global Investors sold on Dec. 31, 2011
• TIAA-CREF Investment Management sold on Sept. 30, 2011
• Royal Bank of Canada sold on Sept. 30, 2011
• Westfield Capital Management Company sold on Sept. 30, 2011
• Century Capital Management sold on Sept. 30, 2011
• Sectoral Asset Management sold on June 30, 2011
• ALLIANCEBERNSTEIN sold on June 30, 2011
• Oracle Investment Management sold on June 30, 2011
• FMR sold on Dec. 31, 2010
• Barclays sold on Dec. 31, 2010
• Maverick Capital sold on Sept. 30, 2005

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