Today's noteworthy upgrades include: A10 Networks (ATEN) upgraded to Overweight from Sector Weight at Pacific Crest... Cal-Maine Foods (CALM) upgraded to Overweight from Equal Weight at Stephens... ChemoCentryx (CCXI) upgraded to Overweight from Neutral at JPMorgan... Cheniere Energy Partners LP (CQP) upgraded to Buy from Neutral at Goldman... Chicago Bridge & Iron (CBI) upgraded to Neutral from Sell at Goldman... Continental Resources (CLR) upgraded to Buy from Neutral at Goldman... Ctrip.com (CTRP) upgraded to Overweight from Neutral at JPMorgan... Emerge Energy (EMES) upgraded to Buy from Neutral at Goldman... FEMSA (FMX) upgraded to Overweight from Equal Weight at Morgan Stanley... GoPro (GPRO) upgraded to Perform from Underperform at Oppenheimer... Holly Energy (HEP) upgraded to Buy from Neutral at Goldman... JP Energy (JPEP) upgraded on better visibility on volumes at RBC Capital... Laredo Petroleum (LPI) upgraded to Neutral from Sell at Goldman... Malvern Bancorp (MLVF) upgraded to Outperform from Market Perform at Keefe Bruyette... Newfield Exploration (NFX) upgraded to Buy from Neutral at Goldman... Norsk Hydro (NHYDY) upgraded to Overweight from Neutral at JPMorgan... Owens-Illinois (OI) upgraded to Neutral from Underperform at BofA/Merrill... Penn National (PENN) upgraded to Buy from Neutral at Goldman... Roche (RHHBY) upgraded to Buy from Neutral at UBS... Schnitzer Steel (SCHN) upgraded on stabilizing headwinds at KeyBanc... Seventy Seven Energy (SSE) upgraded to Buy from Hold at Jefferies... Toll Brothers (TOL) upgraded to Neutral from Underperform at Sterne Agee CRT... United Therapeutics (UTHR) upgraded to Buy from Neutral at BTIG... Volvo (VOLVY) upgraded to Neutral from Underweight at JPMorgan... Zayo Group (ZAYO) upgraded to Buy from Neutral at Goldman.

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Deutsche Bank lowered the firm's price target on Norsk Hydro to NOK 85 from NOK 87 and keeps a Buy rating on the shares.

In the firm's Q1 letter to investors, David Einhorn's Greenlight Capital disclosed new long positions taken during the quarter, including taking stakes in HP Inc. (HPQ), Penn Entertainment (PENN) and Roivant Sciences (ROIV). In the letter, the firm stated that it established a new "medium-sized position" in Penn at an average price of $22.69 per share, arguing that "were the market to credit PENN with merely 15% of DraftKings' value, [Penn's ESPN BET] segment alone would be worth $20 per share." On HP Inc., Greenlight stated that it had established an initial position at an average price of $30.76 per share, adding that it believes "that we are, at a minimum, on the cusp of a normal PC refresh cycle, which should drive earnings above estimates." On Roivant, Greenlight said it had established a "small long position," adding that "in addition to an exciting pipeline, ROIV has a strong track record of positive trial results and successful monetization of pharmaceutical assets." Einhorn's Greenlight Capital also noted that it reduced its Teck Resources (TECK) long position into strength during Q1 and that the firm bought a "small position" in Liberty Global (LBTYA) during Q1.