Monday's Analysts' Upgrades and Downgrades

CHANGE IN RATINGS

Casey's General Stores (CASY Quote) downgraded at FBR to a Market Perform rating as upside to target price from here is just 10%.

First Marblehead (FMD Quote) downgraded at FBR to an Underperform rating as analysis of trust performance suggests increasing risks that loan losses may not be sufficient. Target price is now $26.

Grant Prideco (GRP Quote) upgraded at UBS to Buy rating from Neutral. Price target lifts to $65 from $62 and FY 2008 eps estimates upped to $4.65 from $4.55.

Intersil (ISIL Quote) downgraded at Jefferies to Hold rating from Buy. Price target slashed to $30 from $38 and FY 2008 eps estimates dip to $1.59 from $1.69.

Sierra Pacific Resources (SRP Quote) downgraded at Deutsche Bank to a Hold rating as rate base upside is too opaque. Target price is $18.50.

Tidewater (TDW Quote) upgraded at Jefferies to Buy rating from Hold. Price target and FY 2008 eps estimates remain at $66 and $6.31, respectively.