Is PWER a good stock to own? Find out who bought Power-One, who sold Power-One (PWER) stock, and who holds a large position in Power-One.

• Silver Lake owns 17.50M shares worth $72.45M
• Waddell & Reed Financial owns 8.20M shares worth $34.04M
• Wells Fargo & Company owns 6.62M shares worth $23.84M
• Guggenheim Capital, LLC Managers owns 5.70M shares worth $25.92M
• Vanguard owns 5.68M shares worth $23.56M
• T. Rowe Price Associates owns 5.61M shares worth $23.26M
• Artisan Partners Holdings owns 4.60M shares worth $37.25M
• Artisan Partners Limited Partnership owns 4.00M shares worth $16.59M
• Blue Harbour owns 3.11M shares worth $12.92M
• Walthausen & Co owns 3.11M shares worth $12.87M
• Tocqueville Asset Management owns 2.52M shares worth $11.41M
• Thompson, Siegel, & Walmsley owns 1.96M shares worth $8.87M
• AQR Capital Management owns 1.69M shares worth $7.00M
• STATE STREET CORPORATION owns 1.48M shares worth $6.13M
• AlphaOne Investment Services owns 1.41M shares worth $7.87M
• Scopia Management owns 1.35M shares worth $5.29M
• NUMERIC INVESTORS owns 1.30M shares worth $5.35M
• Schroder Investment Management owns 1.30M shares worth $5.37M
• Batterymarch Financial Management owns 1.26M shares worth $5.23M
• GAM Holding owns 1.15M shares worth $5.23M
• PEAK6 Investments owns 1.11M shares worth $6.18M
• Inves owns 1.10M shares worth $4.54M
• Technical Financial Services owns 1.06M shares worth $4.38M
• Ecofin owns 1.06M shares worth $4.40M
• HIGHBRIDGE CAPITAL MANAGEMENT owns 1.00M shares worth $4.15M
• Norges Bank Investment Management owns 933339 shares worth $3.84M
• ZPR Investment Management owns 745020 shares worth $3.06M
• ESSEX INVESTMENT MANAGEMENT owns 742619 shares worth $2.90M

• CITADEL ADVISORS sold on Sept. 30, 2011
• Heartland Advisors sold on Sept. 30, 2011
• Perimeter Capital Partners sold on Sept. 30, 2011
• Rivanna Capital sold on Sept. 30, 2011
• Millennium Management sold on Sept. 30, 2011
• Alden Global Capital sold on Sept. 30, 2011
• Nierenberg Investment Management Company sold on June 30, 2011
• Tiger Global Management sold on June 30, 2011
• OppenheimerFunds sold on June 30, 2011
• Soros Fund Management sold on March 31, 2011
• Ameriprise Financial sold on March 31, 2011
• Southpoint Capital Advisors sold on March 31, 2011
• Credit Suisse AG sold on March 31, 2011
• Citi sold on March 31, 2011
• Wellington Management Company sold on Dec. 31, 2010
• CALAMOS ADVISORS sold on Dec. 31, 2010
• Sunrise Partners Limited Partnership sold on Dec. 31, 2010
• North Run Capital sold on Dec. 31, 2010
• GOLDMAN SACHS sold on Dec. 31, 2010
• Cadian Capital Management sold on Dec. 31, 2010
• D. E. Shaw & Co sold on Dec. 31, 2010
• Trafelet Capital Management sold on Dec. 31, 2010
• FRIESS ASSOCIATES sold on Dec. 30, 2010
• Roxbury Capital Management sold on Sept. 30, 2010
• Carlson Capital sold on Sept. 30, 2010

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