Today's noteworthy downgrades include: BP (BP) downgraded to Hold from Buy at Jefferies...Black Diamond (BDE) downgraded to Underperformer from Sector Performer at CIBC...Booz Allen (BAH) downgraded to Underweight from Equal Weight at Morgan Stanley...Cullen/Frost (CFR) downgraded to Sell from Hold at Evercore ISI...Daimler AG (DDAIF) downgraded to Buy from Conviction Buy at Goldman...Dominion Midstream (DM) downgraded to Sell from Neutral at Goldman...Enable Midstream (ENBL) downgraded to Sell from Neutral at Goldman...Fairmount Santrol (FMSA) downgraded to Underperform from Hold at Jefferies...Finisar (FNSR) downgraded to Neutral from Buy at MKM Partners...Genesee & Wyoming (GWR) downgraded to Neutral from Buy at BofA/Merrill...Helmerich & Payne (HP) downgraded to Underperform from Hold at Jefferies...Marvell (MRVL) downgraded to Hold from Buy at Brean Capital...Memorial Production (MEMP) downgraded to Sell from Neutral at Goldman...Motorola Solutions (MSI) downgraded to Underperform from Market Perform at Wells Fargo...Northern Tier (NTI) assumed with an Underweight from Neutral at JPMorgan...ONEOK Partners (OKS) downgraded to Sell from Neutral at Goldman...OPKO Health (OPK) downgraded to Hold from Buy at Jefferies...Petrobras (PBR) downgraded to Neutral from Buy at BofA/Merrill...Plains All American (PAA) downgraded to Sell from Neutral at Goldman...RSP Permian (RSPP) downgraded to Neutral from Buy at Goldman...Roper Technologies (ROP) downgraded to Underweight from Neutral at JPMorgan...Rose Rock Midstream (RRMS) downgraded to Neutral from Buy at Goldman...Statoil (STO) downgraded to Underperform from Hold at Jefferies...U.S. Silica (SLCA) downgraded to Underperform from Hold at Jefferies.