Today's noteworthy downgrades include: Altera (ALTR) downgraded to Equal Weight from Overweight at Morgan Stanley... Genesco (GCO) downgraded to Neutral from Outperform at RW Baird... Melco Crown (MPEL) downgraded to Underperform from Neutral at BofA/Merrill... S&T Bancorp (STBA) downgraded to Market Perform from Outperform at Raymond James... Spark Energy (SPKE) downgraded to Hold from Buy at Stifel... WM Morrison (MRWSY) downgraded to Neutral from Buy at Goldman... World Point Terminals (WPT) downgraded to Hold from Buy at Stifel... Xilinx (XLNX) downgraded to Equal Weight from Overweight at Morgan Stanley... Xilinx downgraded to Neutral from Buy at MKM Partners... BreitBurn Energy (BBEP) downgraded to Sell from Hold at Wunderlich... Revett Mining (RVM) downgraded to Neutral from Buy at H.C. Wainwright... RBC Bearings (ROLL) downgraded to Neutral from Accumulate at Global Hunter... Patterson-UTI (PTEN) downgraded to Sector Perform at Scotia Howard Weil... Helmerich & Payne (HP) downgraded to Sector Perform at Scotia Howard Weil.