Benzinga's Top Upgrades, Downgrades For May 21, 2018

Moffett Nathanson upgraded Snap Inc. SNAP from Sell to Neutral. Snap shares rose 1.51 percent to $10.74 in pre-market trading.
Bank of America upgraded Dillard's, Inc. DDS from Underperform to Buy. Dillard's shares rose 3.53 percent to $80.10 in pre-market trading.
Barclays upgraded Achillion Pharmaceuticals, Inc. ACHN from Underweight to Equal-Weight. Achillion Pharmaceuticals shares rose 5.41 percent to $3.90 in pre-market trading.
Analysts at Argus upgraded Sempra Energy SRE from Hold to Buy. Sempra Energy shares fell 0.21 percent to close at $101.97 on Friday.
Stifel Nicolaus upgraded Knight-Swift Transportation Holdings Inc. KNX from Hold to Buy. Knight-Swift shares rose 1.99 percent to $41.44 in pre-market trading.
KeyBanc upgraded Alteryx, Inc. AYX from Sector Weight to Overweight. Alteryx shares rose 5.32 percent to $32.49 in pre-market trading.
Jefferies upgraded Energizer Holdings, Inc. ENR from Hold to Buy. Energizer shares fell 0.25 percent to close at $56.47 on Friday.
Northcoast Research upgraded Kelly Services, Inc. KELYA from Neutral to Buy. Kelly Services shares rose 3.01 percent to $23.24 in pre-market trading.

UBS downgraded Bristol-Myers Squibb Company BMY from Buy to Neutral. Bristol-Myers shares fell 0.21 percent to $52.60 in pre-market trading.
Evercore ISI Group downgraded HCP, Inc. HCP from In-Line to Underperform. HCP shares fell 0.52 percent to close at $23.02 on Friday.
Morgan Stanley downgraded Medidata Solutions, Inc. MDSO from Overweight to Equal-Weight. Medidata Solutions shares rose 1.45 percent to close at $77.54 on Thursday.
Stifel Nicolaus downgraded Williams Partners L.P. WPZ from Buy to Hold. Williams Partners shares fell 0.63 percent to close at $41.23 on Friday.
SunTrust Robinson Humphrey downgraded American Eagle Outfitters AEO from Buy to Hold. American Eagle shares fell 2.21 percent to $22.59 in pre-market trading.
Evercore ISI Group downgraded Ventas, Inc. VTR from In-Line to Underperform. Ventas shares fell 0.08 percent to $51.42 in pre-market trading.
Morgan Stanley downgraded AppFolio, Inc. APPF from Equal-Weight to Underweight. AppFolio shares fell 2.60 percent to $56.30 in pre-market trading.
Barclays downgraded Prothena Corporation plc PRTA from Equal-Weight to Underweight. Prothena shares fell 2.05 percent to close at $15.28 on Friday.
SunTrust Robinson Humphrey downgraded Q2 Holdings, Inc. QTWO from Buy to Hold. Q2 Holdings shares fell 1.30 percent to $56.75 in pre-market trading.

Canaccord Genuity initiated coverage on Ceridian HCM Holding Inc. CDAY with a Hold rating. The price target for Ceridian HCM is set to $36. Ceridian HCM shares closed at $36.82 on Friday.
Analysts at Berenberg initiated coverage on Flowers Foods, Inc. FLO with a Hold rating. The price target for Flowers Foods is set to $19. Flowers Foods shares closed at $19.29 on Friday.
Argus initiated coverage on V.F. Corporation VFC with a Buy rating. The price target for V.F. Corp is set to $101. V.F. Corp shares closed at $80.07 on Friday.
Stifel Nicolaus initiated coverage on nLIGHT, Inc. LASR with a Buy rating. The price target for nLIGHT is set to $40. nLIGHT shares closed at $29.97 on Friday.
Analysts at Deutsche Bank initiated coverage on Ceridian HCM Holding Inc. CDAY with a Hold rating. The price target for Ceridian HCM is set to $40. Ceridian HCM shares closed at $36.82 on Friday.
Berenberg initiated coverage on Hostess Brands, Inc. TWNK with a Buy rating. The price target for Hostess Brands is set to $15. Hostess Brands shares closed at $12.70 on Friday.
Analysts at Vertical Research initiated coverage on The Chemours Company NBL with a Buy rating. Chemours closed at $52.17 on Friday.