13D
13D 13DRequired SEC filing by 5% or more shareholder. The filing is often used by activist investors. A passive investor may file the shorter 13G.
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Form SC 13D/A CANADIAN PACIFIC RAILWAY Filed by: Pershing Square Capital Management, L.P.
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Ackman's Pershing Square Releases Q3 2011 13F
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Pershing Square Capital Shows New 12.19% Stake in Canadian Pacific Railway Ltd. (CP)
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Form SC 13D CANADIAN PACIFIC RAILWAY Filed by: Pershing Square Capital Management, L.P.
