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

• PRIMECAP Management Company owns 12.51M shares worth $200.99M
• ClearBridge Advisors owns 6.12M shares worth $98.31M
• Sectoral Asset Management owns 5.59M shares worth $89.85M
• Vanguard owns 4.53M shares worth $72.72M
• Wellington Management Company owns 3.71M shares worth $59.57M
• BB Biotech AG owns 3.43M shares worth $55.09M
• STATE STREET CORPORATION owns 2.60M shares worth $41.76M
• OrbiMed Advisors owns 1.93M shares worth $28.14M
• Artal Group S.A. owns 1.79M shares worth $28.75M
• GRANAHAN INVESTMENT MANAGEMENT INC/MA owns 1.13M shares worth $18.21M
• Gail Mannix owns 988585 shares worth $15.89M
• First Trust Advisors owns 839570 shares worth $13.49M
• TCW owns 675199 shares worth $9.86M
• Ulys owns 550000 shares worth $7.91M
• Heather K. Mellem, Esq. owns 491852 shares worth $8.23M
• Hambrecht & Quist Capital Management owns 393773 shares worth $6.32M
• TIAA-CREF Investment Management owns 373363 shares worth $6.00M
• T. Rowe Price Associates owns 355500 shares worth $5.71M
• Norges Bank Investment Management owns 334089 shares worth $4.26M
• Geode Capital Management owns 323867 shares worth $5.20M
• GOLDMAN SACHS owns 301769 shares worth $4.40M
• OppenheimerFunds owns 300000 shares worth $3.47M
• Inves owns 255570 shares worth $3.73M
• Twin Focus Capital Partners owns 248531 shares worth $3.17M
• Platte River Capital owns 235984 shares worth $3.44M
• Charles Schwab Bank owns 229658 shares worth $14.30M
• Perella Weinberg Partners Capital Management owns 228700 shares worth $3.67M
• Richard E. Dirickson, Jr. owns 200150 shares worth $2.92M

• Renaissance Technologies sold on Sept. 30, 2011
• Barclays sold on June 30, 2011
• Jefferies sold on March 31, 2011
• Altrinsic Global Advisors sold on March 31, 2011
• FMR sold on Dec. 31, 2010
• Maverick Capital sold on Dec. 31, 2000

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