Top Wall Street analysts changed their outlook on these top names. For a complete view of all analyst rating changes, including upgrades, downgrades and initiations, please see our analyst ratings page.Keybanc analyst Aleksey Yefremov initiated coverage on Avient Corporation AVNT with an Overweight rating and announced a price target of $48. Avient shares closed at$35.77 on Tuesday. See how other analysts view this stock.Barclays analyst Etzer Darout initiated coverage on Protagonist Therapeutics, Inc. PTG ...