NEW YORK (TheStreet) -- RATINGS CHANGES

Applied Materials (AMAT) - Get Report was downgraded at RBC from Sector Perform to Underperform. $12 price target. Company is leveraged to lower industry capital spending. 

Arts Way (ARTW) - Get Report was downgraded to a sell by TheStreet Ratings. You can view the full analysis from the report here: ARTW

AutoZone (AZO) - Get Report was upgraded at Oppenheimer from Perform to Outperform. $850 price target. New inventory initiatives should enhance sales productivity. 

Bluebird Bio (BLUE) - Get Report was upgraded to Overweight at Morgan Stanley. $143 price target. Company offers innovation at a discount valuation. 

Devon Energy
(DVN) - Get Report was downgraded to a sell at TheStreet Ratings. You can view the full analysis from the report here: DVN

DineEquity (DIN) - Get Report was downgraded at Keybanc to Sector Weight. Dividend increase was not as large as expected.

Freeport-McMoRan (FCX) - Get Report  was downgraded from Buy to Hold at Deutsche Bank. $11 price target. Balance sheet could be hurt by lower commodity prices.

FireEye (FEYE) - Get Report was downgraded at Piper from Overweight to Neutral. $37 price target. Company is facing increased competition.

Lam Research (LRCX) - Get Report was downgraded at RBC from Sector Perform to Underperform. $52 price target. Company is leveraged to lower industry capital spending. 

Norfolk Southern (NSC) - Get Report was downgraded at Barclays to Underweight. Company is losing market share to CSX. 

Nucor (NUE) - Get Report  was upgraded from Hold to Buy at Deutsche Bank. $52 price target. Company should benefit from falling scrap prices. 

Outfront Media (OUT) - Get Report upgraded at Goldman to Buy. $23 price target. Small cell deal could provide upside to EBITDA.

Rockwell Automation (ROK) - Get Report was downgraded at Baird from Outperform to Neutral, Robert Baird said. $100 price target. Company is leveraged to a decelerating macro environment. 

Scripps Networks (SNI)   was downgraded to Sell at Goldman Sachs. Company has higher leverage to the television ad market. $47 price target. 

Twitter (TWTR) - Get Report upgraded at Axiom from Hold to Buy. $37 price target. New CEO should help turn the business around. 

Tyco (TYC) was downgraded from Overweight to Equal-weight, Barclays said. $31 price target. Sector is leveraged to emerging market risk.

Union Pacific (UNP) - Get Report was downgraded at Barclays to Equal-weight. Company is facing mix erosion.

Viacom (VIAB) - Get Report was downgraded at Goldman to Neutral. $46 price target. Company has multiple potential negative catalysts. 

Stock Comments / EPS Changes

Blue Buffalo (BUFF) added to Focus List at JP Morgan. Stock has pulled back to an attractive level and business remains on track. 

Time Warner (TWX) was cut from Conviction Buy List at Goldman Sachs. $78 price target. Concerns are growing about the pay TV market.

This article was written by a staff member of TheStreet.