NEW YORK ( TheStreet) -- CHANGE IN RATINGSAkorn ( AKRX) downgraded at Deutsche from Buy to Hold, Deutsche Bank said. Valuation call, based on a $14 price target. Aeropostale ( ARO) upgraded at Piper from Neutral to Overweight, Piper Jaffray said. $24 price target. Better pricing should improve margins. ArthroCare Corporation ( ARTC) upgraded to buy at TheStreet Ratings. Astec Industries ( ASTE) upgraded to buy at TheStreet Ratings. Berkshire Hathaway ( BRK.A) upgraded to buy at TheStreet Ratings. Cinemark ( CNK) rated new Neutral at Goldman. $15 price target. U.S. movie demand and pricing growth is slowing. Cablevision ( CVC) upgraded at BofA/Merrill to Buy, Bank of America/Merrill Lynch said. $18 price target. Growth could accelerate, after a year of underperformance. Cypress Semiconductor ( CY) upgraded at Cantor from Sell to Hold, Cantor Fitzgerald said. Valuation call, based on an $11 price target. Deckers ( DECK) downgraded at Sterne Agee to Underperform, Sterne Agee said. $38 price target. Estimates cut, given lower likely international sales. Fifth Third ( FITB) upgraded at Compass Point from Neutral to Buy, Compass Point said. Valuation call, based on a $17 price target. Illumina ( ILMN) upgraded at Leerink from Market Perform to Outperform, Leerink Swann said. Company has multiple potential catalysts. Imax ( IMAX) rated new Buy at Goldman. $30 price target. Company is growing faster than its peers and is leveraged to China. KB Home ( KBH) upgraded at Goldman from Neutral to Buy, Goldman Sachs said. $15 price target. Rising home prices should drive new housing starts. Mosaic ( MOS) upgraded at Citigroup to Buy from Neutral, Citigroup said. $66 price target. Also added to TPL! list. Demand for fertilizers is strong with drought. NVR ( NVR) downgraded at Goldman to Sell, Goldman Sachs said. $760 price target. Company is facing increased competition. Onyx Pharmaceuticals ( ONXX) upgraded at Jefferies to Buy from Hold, Jefferies said. $101 price target. Improved outlook with limited downside. Buy rating. Penn National ( PENN) downgraded at Keybanc from Buy to Hold, Keybanc said. Valuation call, as consumer sentiment is weakening. Ryland ( RYL) upgraded at Goldman to Neutral, Goldman Sachs said. $34 price target. Estimates also boosted, given higher industry pricing. Schlumberger ( SLB) upgraded at Argus from Hold to Buy, Argus Research said. $85 price target. International and deepwater markets should drive growth.