NEW YORK ( TheStreet) -- CHANGE IN RATINGSAK Steel ( AKS) downgraded at Goldman from Buy to Neutral. Valuation call, with the stock near the $26 price target. Company could also see margin pressure from higher iron ore prices. Crown Castle ( CCI) downgraded at Wells from Outperform to Market Perform. See little potential for earnings upside this year. Fifth Third Bancorp ( FITB) downgraded at FBR from Outperform to Market Perform. $14 price target. Valuation call, as the stock is up 24% since October. MFA Financial ( MFA) downgraded at Jefferies from Buy to Hold. $7 price target. GSE repurchases will reduce the company's portfolio. Oneok ( OKE) downgraded at Wells from Outperform to Market Perform. Valuation call, as the stock is up 80% since May. Progress Energy ( PGN) initiated at Citi with a Hold rating and $40 price target. Still a work in progress. 2010 and 2011 EPS estimates set at $2.88 and $2.94, respectively. PNC Financial ( PNC) upgraded at FBR from Market Perform to Outperform. $65 price target. Equity raise reduces the company's risk profile. Potash ( POT) upgraded at Morgan Joseph from Hold to Buy. $130 price target. Buying activity has picked up in the potash market, which should send prices higher. Perrigo ( PRGO) downgraded at BofA/Merrill to Neutral from Buy on valuation, still a solid story. Price target raised to $55. 2010 EPS estimate tweaked up to $2.61, 2011 maintained at $3.05. Research in Motion ( RIMM) upgraded at BMO from Market Perform to Outperform. $88 price target. Company will likely boost guidance when it reports earnings at the end of the month. Schnitzer Steel ( SCHN) downgraded at UBS from Buy to Neutral. $54 price target. Scrap prices could slide in the second quarter. Sempra Energy ( SRE) upgraded at Barclays to Overweight from Equal Weight as sale of JV business is nearly complete. Price target increased by a dollar to $57. 2010 and 2011 EPS estimates set at $4.43 and $4.35, respectively. Steel Dynamics ( STLD) upgraded at Keybanc from Hold to Buy. $23 price target. Company should see strong shipping momentum. U.S. Steel ( X) upgraded at Goldman to Buy. $70 price target. Raw materials pricing are rising, which should boost steel prices.