NEW YORK ( TheStreet) -- RATINGS CHANGES

Booz Allen Hamilton ( BAH - Get Report) was downgraded at Morgan Stanley to Underweight. $23 price target. Company is facing increased competition. 
 
BankUnited ( BKU - Get Report) was upgraded at BofA/Merrill from Neutral to Buy, Bank of America/Merrill Lynch said. $42 price target. Company has no oil exposure and limited downside from lower interest rates. 
 
Casey's General ( CASY - Get Report) was upgraded at BMO to Market Perform, BMO Capital said. Company is cutting costs and is leveraged to lower gasoline prices. $105 price target. 
 
Chevron ( CVX - Get Report) was upgraded at JP Morgan from Neutral to Overweight, JP Morgan said. Valuation call, based on a $86 price target. 
 
Concho ( CXO - Get Report) was downgraded at Goldman from Buy to Neutral, Goldman Sachs said. $123 price target. Valuation call, as the stock has outperformed its peers by more than 30% year-to-date. 
 
Finisar ( FNSR - Get Report) was downgraded at MKM from Buy to Neutral, MKM Partners said. Datacom environment continues to deteriorate. $15.50 price target. 
 
Helmerich & Payne ( HP - Get Report) was downgraded at Jefferies from Hold to Underperform. Company is leveraged to lower rig day rates. $40 price target. 
 
JB Hunt ( JBHT - Get Report) was upgraded at BofA/Merrill from Neutral to Buy. $90 price target. Company is gaining market share. 
 
Lululemon ( LULU - Get Report) was upgraded at Baird from Neutral to Outperform,. $69 price target. Stock fell after earnings, but the company has strong sales momentum.
 
Motorola Solutions ( MSI - Get Report) was downgraded to Underperform at Wells Fargo. Stock is overvalued, following the recent tender offer. 
 
Noble Energy ( NBL - Get Report) was upgraded at Jefferies from Hold to Buy. Valuation call, based on a $37 price target. 

Norfolk Southern (NSC - Get Report) was upgraded at BofA/Merrill from Neutral to Buy. $90 price target. Rail carloads are bottoming out.

Roper (ROP - Get Report) was downgraded at JP Morgan from Neutral to Underweight. Valuation call, based on a $158 price target.

Toll Brothers (TOL - Get Report) was upgraded at JP Morgan from Underweight to Neutral. Valuation call, based on a $41.50 price target.

Whiting Petroleum (WLL - Get Report) was upgraded at Goldman from Neutral to Buy. $24 price target. Company is improving its balance sheet by selling assets.

Zendesk (ZEN - Get Report) was upgraded at Credit Suisse from Neutral to Outperform. $30 price target. Company can generate sustainable, robust revenue growth.

Zoetis (ZTS - Get Report) was upgraded at BMO from Market Perform to Outperform. $53 price target. Stock is down 20% since June, but the company has positive long-term prospects.

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This article was written by a staff member of TheStreet.