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

• Deerfield Management Company owns 4.95M shares worth $132.34M
• Vanguard owns 3.63M shares worth $118.00M
• Broadwood Capital owns 3.58M shares worth $66.10M
• STATE STREET CORPORATION owns 1.79M shares worth $58.09M
• Next Century Growth Investors owns 1.74M shares worth $92.89M
• Oak Ridge Investments owns 1.48M shares worth $48.03M
• Valinor Management owns 1.44M shares worth $38.59M
• ALLIANCEBERNSTEIN owns 1.44M shares worth $76.86M
• American Century Companies owns 1.41M shares worth $52.91M
• Visium Asset Management owns 1.39M shares worth $52.29M
• NorthCoast Asset Management owns 1.35M shares worth $43.86M
• OrbiMed Advisors owns 1.32M shares worth $70.40M
• OppenheimerFunds owns 1.27M shares worth $41.29M
• Century Capital Management owns 1.26M shares worth $47.39M
• Bank of America Corporation owns 1.24M shares worth $33.23M
• Palo Alto Investors owns 1.23M shares worth $40.13M
• Schroder Investment Management owns 1.20M shares worth $38.98M
• FRED ALGER MANAGEMENT owns 1.03M shares worth $33.42M
• BAM owns 985063 shares worth $52.44M
• Sandler Capital Management owns 963500 shares worth $31.35M
• GOLDMAN SACHS owns 955237 shares worth $17.64M
• CALAMOS ADVISORS owns 950000 shares worth $50.58M
• Barclays owns 949000 shares worth $17.53M
• HAP Trading owns 902449 shares worth $16.67M
• T. Rowe Price Associates owns 901234 shares worth $24.08M
• Adage Capital Partners GP owns 900000 shares worth $29.29M
• Inves owns 874896 shares worth $46.58M
• First Pacific Advisors owns 861100 shares worth $32.39M
• Partner Fund Management owns 850244 shares worth $45.27M
• Perceptive Advisors owns 760000 shares worth $28.59M
• Wells Fargo & Company owns 743940 shares worth $39.61M
• TIAA-CREF Investment Management owns 731691 shares worth $23.81M
• Millennium Management owns 716780 shares worth $26.97M
• SCOUT INVESTMENTS owns 708643 shares worth $37.73M
• Daniel D. Thurber owns 645808 shares worth $21.01M
• New Amsterdam Partners owns 639709 shares worth $11.82M
• CITADEL ADVISORS owns 628670 shares worth $16.80M
• Allianz Global Investors of America owns 628110 shares worth $23.63M
• Teachers Advisors owns 627836 shares worth $20.43M
• Franklin Resources owns 609300 shares worth $32.44M
• Waddell & Reed Financial owns 608540 shares worth $22.89M

• Name Goodman & Company, Investment Counsel sold on Dec. 31, 2011
• WALL STREET ASSOCIATES sold on June 30, 2011
• Kestrel Investment Management Corporation sold on June 30, 2011
• Black Horse Capital Management sold on June 30, 2011
• Heather K. Mellem, Esq. sold on June 30, 2011
• Columbus Circle Investors sold on June 30, 2011
• Rice Hall James & Associates sold on June 30, 2011
• Thompson, Siegel, & Walmsley sold on March 31, 2011
• Royce & Associates sold on March 31, 2011
• Perritt Capital Management sold on March 31, 2011
• FMR sold on Dec. 31, 2010
• Pier Capital sold on Dec. 31, 2010
• Driehaus Capital Management sold on Dec. 31, 2010

• Auxilium Pharmaceuticals (AUXL)
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• InterMune (ITMN)
• Pfizer (PFE)
• Bristol Myers Squibb (BMY)
• Zebra Technologies (ZBRA)
• Universal Health Services (UHS)
• STAAR Surgical Company (STAA)
• Walgreen Company (WAG)
• Conceptus (CPTS)
• Allscripts Healthcare Solutions (MDRX)
• DepoMed (DEPO)
• Medicines Company (MDCO)
• Questcor Pharmaceuticals (QCOR)
• Molina Healthcare (MOH)
• NuVasive (NUVA)
• NxStage Medical (NXTM)
• Cytokinetics (CYTK)
• Rigel Pharmaceuticals (RIGL)
• St. Jude Medical (STJ)
• Solta Medical (SLTM)