Today's noteworthy downgrades include: AG Mortgage (MITT) downgraded to Market Perform from Outperform at Keefe Bruyette... Brookfield Renewable (BEP) downgraded to Underperform from Neutral at Credit Suisse... Emera (EMRAF) downgraded to Equal Weight from Overweight at Barclays... Fibria Celulose (FBR) downgraded to Neutral from Buy at Citigroup... First Marblehead (FMD) downgraded to Neutral from Buy at Compass Point... First Security (FSGI) downgraded to Market Perform from Outperform at Raymond James... Gap (GPS) downgraded to Market Perform from Outperform at FBR Capital... Intelsat (I) downgraded to Underweight from Equal Weight at Morgan Stanley... LivePerson (LPSN) downgraded to Neutral from Outperform at Credit Suisse... MercadoLibre (MELI) downgraded on valuation, difficult comps at Stifel... Midway Gold (MDW) downgraded to Underperform from Outperform at RBC Capital... Numerex (NMRX) downgraded to Market Perform from Outperform at Northland... Portland General Electric (POR) downgraded to Neutral from Overweight at JPMorgan... Rackspace (RAX) downgraded to Outperform from Buy at CLSA... Rosetta Resources (ROSE) downgraded to Sector Weight from Overweight at KeyBanc... SouFun (SFUN) downgraded to Hold from Buy at Deutsche Bank... Verizon (VZ) downgraded to Underperform from Neutral at Macquarie.