NEW YORK ( TheStreet) -- CHANGE IN RATINGSAdvanced Micro ( AMD) downgraded at Oppenheimer from Perform to Underperform. Orders could track lower in the second half of the year. Ann Taylor Stores ( ANN) upgraded at BofA/Merrill to the US1 List on rebounding female products and valuation. Maintain Buy rating and $30 price target. Best Buy ( BBY) downgraded at Jefferies from Buy to Hold. $36 price target. Sales trends are eroding further, and the stock could become a value trap. Costco ( COST) upgraded at UBS from Neutral to Buy. $63 price target. Sales have been strong and recent weakness has created a buying opportunity. Eaton Vance ( EV) upgraded at JP Morgan. Rating raised to Neutral from Underweight. Price target raised to $30 from $28. 2010 EPS estimates raised to $1.50 from $1.45. Edwards Lifesciences ( EW) rated new Outperform at William Blair. Company can deliver above-average growth, aided by new products. Intel ( INTC) downgraded at Oppenheimer from Outperform to Perform. Supply appears to be catching up with demand. Janus Capital ( JNS) upgraded at JP Morgan. Rating raised to Neutral from Underweight. Price target raised to $9.50 from $8.50. 2010 EPS estimates raised to $0.59 from $0.57. Marvell Technology ( MRVL) downgraded at Oppenheimer from Outperform to Perform. PC and consumer demand could fall in the second half of the year. Myriad Genetics ( MYGN) downgraded at JP Morgan. Rating lowered to Neutral from Overweight. Price target lowered to $18 from $28. Maintains 2010 EPS estimates of $1.32. Norfolk Southern ( NSC) upgraded at JP Morgan. Rating raised to Overweight from Neutral. Maintains $68 price target and 2010 EPS estimates of $3.81. Stericycle ( SRCL) rated new Buy at Jefferies. $80 price target. Business mix is shifting toward higher-margin accounts. Texas Instruments ( TXN) upgraded at Oppenheimer from Perform to Outperform. $30 price target. Company is a large-cap defensive play.