Top Analyst Upgrades and Downgrades: Caterpillar, Comcast, Fitbit, Groupon, Mattel, Take-Two, Time Warner, Zynga and More

The top analyst upgrades, downgrades and other research calls from Thursday include Caterpillar, Comcast, Fitbit, Groupon, Mattel, Take-Two, Time Warner and Zynga.

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