Activist investors have been effective in blocking some big mega deals from getting done, and have made money in the process, according to The Deal's Senior Editor Ronald Orol. Orol looked at activist involvement in proposed deals that include Halliburton (HAL) and Baker Hughes (BHI) , Staples (SPLS) and Office Depot (ODP) , and Canadian Pacific (CP) and Norfolk Southern (NSC) .
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