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

• Vanguard owns 926250 shares worth $31.55M
• Oak Ridge Investments owns 812431 shares worth $27.68M
• TCW owns 621286 shares worth $18.02M
• Renaissance Technologies owns 571500 shares worth $15.20M
• Ranger Investment Management owns 496909 shares worth $14.41M
• Daniel D. Thurber owns 478129 shares worth $16.29M
• Thomas Weisel Asset Management owns 320257 shares worth $10.91M
• Polar Capital owns 297765 shares worth $10.14M
• CITADEL ADVISORS owns 282155 shares worth $7.50M
• STATE STREET CORPORATION owns 278549 shares worth $9.49M
• Cupps Capital Management owns 272656 shares worth $10.00M
• OppenheimerFunds owns 245826 shares worth $9.01M
• Jennison Associates owns 236059 shares worth $8.04M
• Perimeter Capital Partners owns 229288 shares worth $6.64M
• WALL STREET ASSOCIATES owns 225000 shares worth $6.53M
• Wellington Management Company owns 218090 shares worth $7.43M
• Driehaus Capital Management owns 204613 shares worth $7.50M
• Sparta Asset Management owns 183162 shares worth $4.87M
• Frank Russell Company owns 167207 shares worth $4.99M
• T. Rowe Price Associates owns 154400 shares worth $5.26M
• Whale Rock Capital Management owns 116106 shares worth $4.26M
• Geneva Capital Management owns 115896 shares worth $3.95M
• Inves owns 110550 shares worth $3.21M
• GOLDMAN SACHS owns 106734 shares worth $3.64M
• Public Employees' Retirement Association of Colorado owns 90200 shares worth $3.31M
• Credo Capital Management owns 88511 shares worth $3.02M

• DuPont Capital Management Corporation sold on June 30, 2012
• Norges Bank Investment Management sold on March 31, 2012
• Heather K. Mellem, Esq. sold on Sept. 30, 2011
• Next Century Growth Investors sold on Sept. 30, 2011
• Roxbury Capital Management sold on Sept. 30, 2011
• American Century Companies sold on Sept. 30, 2011
• Allianz Global Investors of America sold on Sept. 30, 2011
• Teachers Advisors sold on Sept. 30, 2011
• Damian Sousa sold on June 30, 2011
• Contour Asset Management sold on June 30, 2011
• Coe Capital Management sold on June 30, 2011
• AH Lisanti Capital Growth sold on June 30, 2011
• MCKINLEY CAPITAL MANAGEMENT sold on June 30, 2011
• FRIESS ASSOCIATES sold on March 31, 2011
• AXA sold on March 31, 2011
• RGM Capital sold on March 31, 2011
• Austin W. Marxe and David M. Greenhouse sold on Dec. 31, 2010
• FMR sold on Dec. 31, 2010
• Manulife Asset Management sold on June 30, 2004
• Manufacturers Life Insurance Company sold on March 31, 2004

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