NEW YORK (TheStreet) -- RATINGS CHANGES

Aegerion Pharmaceuticals (AEGR) was upgraded to buy from hold by Jefferies, which set a $26 price target, saying the stock is positively skewed risk/reward.

AutoNation (AN) - Get Report was upgraded to buy by Sterne Agee, which set a $76 price target, saying the recent selloff has created a buying opportunity.

Baidu (BIDU) - Get Report was downgraded to hold from buy by Brean Capital, which said that earnings growth will likely be muted as management is investing in future growth.

Baidu (BIDU) - Get Report was downgraded to sector weight from overweight by Pacific Crest, which said the company is facing headwinds for margins and sales growth.

Boyd Gaming (BYD) - Get Report was upgraded to neutral from underperform by Bank of America/Merrill Lynch, which set an $18 price target, saying the company is leveraged to a regional gaming recovery.

Credit Suisse (CS) - Get Report was upgraded to hold by TheStreet Ratings. You can view the full analysis from the report here: CS Ratings Report.

Entergy (ETR) - Get Report was downgraded to sell from neutral by Goldman Sachs, which set a $68 price target, saying the company is leveraged to lower natural-gas prices and estimates are now below consensus.

Kaiser Aluminum (KALU) - Get Report was downgraded to sector weight from overweight by Keybanc, which cited valuation, as the stock has outperformed its peers over the past five months.

KLA-Tencor (KLAC) - Get Report was downgraded to sell by Citigroup. Estimates have also been cut, given lower expected industry spending, Citigroup said.

LinkedIn (LNKD) was started at buy by MKM Partners, which set a $285 price target, saying that talent and marketing alone justify the stock.

Raytheon (RTN) - Get Report was upgraded to buy by Bank of America/Merrill Lynch, which cited valuation, based on a $120 price target.

Robert Half International (RHI) - Get Report was downgraded to underweight from equal-weight by Barclays, which set a $55 price target, saying the company will likely see decelerating revenue growth.

Sotheby's (BID) - Get Report was downgraded to hold by TheStreet Ratings. You can view the full analysis from the report here: BID Ratings Report.

Teva Pharmaceutical (TEVA) - Get Report was upgraded to outperform by BMO Capital, which set an $80 price target, saying the Allergan (AGN) - Get Report deal makes the company a generic leader.

United Natural Foods (UNFI) - Get Report was downgraded to market perform by BMO Capital. Estimates were also cut, following the loss of the Albertson's contract, BMO Capital said.

Waste Management (WM) - Get Report was upgraded to buy from hold by Argus Research, which cited valuation, based on a $57 price target.

WEC Energy (WEC) - Get Report was upgraded to buy from neutral and given a $51 price target by Goldman Sachs, which said the company is cutting costs and deserves a premium valuation.

Yelp (YELP) - Get Report was downgraded to hold from buy by Deutsche Bank, which set a $33 price target, saying that estimates have also been reduced further below consensus, as the company continues to face problems with its salesforce.