Top Analyst Upgrades and Downgrades: Apple, GE, Gilead, Humana, Oasis Petroleum, Sprint, Wynn, Yelp, Zynga and More

The top analyst upgrades, downgrades and other research calls from Thursday include Apple, GE, Gilead, Humana, Oasis Petroleum, Sprint, Wynn, Yelp and Zynga.

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