Today's noteworthy downgrades include: Cloud Peak (CLD) downgraded to Equal Weight from Overweight at Morgan Stanley... Comerica (CMA) downgraded to Neutral from Overweight at JPMorgan... Concho Resources (CXO) downgraded to Neutral from Buy at SunTrust... Cummins (CMI) downgraded to Market Perform from Outperform at BMO Capital... Exact Sciences (EXAS) downgraded to Hold from Buy at Benchmark... Heartland Payment (HPY) downgraded to Market Perform at Keefe Bruyette... Illumina (ILMN) downgraded to Neutral from Buy at BTIG... KT Corporation (KT) downgraded to Neutral from Buy at Goldman... LINN Energy (LINE) downgraded on elevated leverage, distribution cut worries at Stifel... LinnCo (LNCO) downgraded to Hold from Buy at Stifel... Peabody (BTU) downgraded to Equal Weight from Overweight at Morgan Stanley... Radware (RDWR) downgraded on preannouncement, execution challenges at Oppenheimer... Southern Copper (SCCO) downgraded to Underperform on relative valuation at BofA/Merrill... Telecom Italia (TI) downgraded to Underweight from Equal Weight at Barclays... Teledyne (TDY) downgraded to Hold from Buy at Needham... Vantiv (VNTV) downgraded to Market Perform from Outperform at Keefe Bruyette.

Piper Sandler analyst R. Scott Siefers raised the firm's price target on Comerica to $56 from $54 and keeps a Neutral rating on the shares. The Q1 results from the Midwest banks contained no major surprises, and they are "hopefully nearing a positive" net interest income inflection, the analyst tells investors in a research note. Despite the fluid rate environment, managements broadly reiterated NII guides, says Piper.

Teledyne is down -8.5%, or -$34.59 to $372.47.

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