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To demonstrate the folly, let's look at 2 big winners over the past week.
Here are Wednesday's top research calls, including upgrades for Disney, Fitbit and Fossil, and downgrades for Lululemon Athletica and Sysco.
Here's a technical look at how to trade some of the most active stocks on the market right now.
Here are Monday's top research calls, including downgrades for CME Group, Nucor and SeaWorld, and an upgrade for Square.