Today's noteworthy downgrades include: Amgen (AMGN) downgraded to Neutral from Buy at UBS... Arch Capital (ACGL) downgraded to Neutral from Buy at BofA/Merrill... Con-way (CNW) downgraded to Neutral from Outperform at Credit Suisse... Dollar Tree (DLTR) downgraded to Underweight from Equal Weight at Morgan Stanley... Dunkin' Brands (DNKN) downgraded to Neutral from Buy at Goldman... Hellenic Telecom (HLTOY) downgraded to Underperform from Outperform at RBC Capital... Pinnacle Entertainment (PNK) downgraded to Neutral from Positive at Susquehanna... Regeneron (REGN) downgraded to Sell from Neutral at UBS... Shake Shack (SHAK) downgraded to Sell on relative downside potential at Goldman... Technip (TKPPY) downgraded to Neutral from Outperform at Exane BNP Paribas... Thompson Creek (TC) downgraded to Hold from Buy at Stifel... Validus (VR) downgraded to Underperform from Neutral at BofA/Merrill... W. R. Berkley (WRB) downgraded to Neutral from Buy at BofA/Merrill... WESCO (WCC) downgraded to Neutral from Overweight at JPMorgan... WisdomTree (WETF) downgraded to Neutral from Positive at Susquehanna.