Covidien PLC (NYSE: COV) was downgraded to Neutral from Overweight at Piper Jaffray.

DreamWorks Animation SKG Inc. (NASDAQ: DWA) downgraded to Neutral from Buy and the price target was cut to $25 from $32 (versus a $22.52 close) at B. Riley.

Google Inc. (NASDAQ: GOOGL) was reiterated as Outperform and the price target was raised to $742 from $735 at Credit Suisse. The firm believes that Google Play is the next important multibillion dollar opportunity for Google.

Nasdaq OMX Group Inc. (NASDAQ: NDAQ) was raised to Overweight from Equal Weight by Evercore. The price target was $46, versus a $39.11 close.

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OGE Energy Corp. (NYSE: OGE) was raised to Buy a target price of $44 (versus a $37.42 close) at Argus.

Reynolds American Inc. (NYSE: RAI) was raised to Outperform from Sector Perform with a $72 price target (versus a $61.75 close) at RBC Capital Markets.

Signature Bank (NASDAQ: SBNY) was raised to Buy with a $144 price target (versus a $122.36 close) at Sterne Agee.

TripAdvisor Inc. (NASDAQ: TRIP) was downgraded to Neutral from Buy with a $103 price target at Nomura. Credit Suisse maintained its Outperform rating and raised its target price to $125 from $105 in the call.

USG Corp. (NYSE: USG) was downgraded to Sector Perform from Outperform at RBC Capital Markets.

Wells Fargo & Co. (NYSE: WFC) was downgraded to Neutral from Overweight at J.P. Morgan after last week’s earnings report. Credit Suisse raised its estimates on Wells Fargo, but only maintained its Neutral rating.

Yelp Inc. (NYSE: YELP) was started with an Underweight rating and a $65 price target (versus a $70.62 close) at Evercore.

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In case you missed Friday’s top analyst upgrades and downgrades, they included shares of Apple, Altria, Gap, Qualcomm, Shell, P&G and a dozen more.