The outdoor sign seen at the DaVita Dialysis clinic in Denver February 16, 2016. U.S.-listed shares of Fresenius fell 16.4%, to $17.5, and Davita fell about 16%, to $76.7, in premarket hours. Shares of U.S.-based Baxter International (BAX.N), which makes products used by dialysis therapy providers, also fell about 9%, to $33.99 premarket. Davita and U.S.-listed shares of Fresenius Medical are among the top percentage losers on the New York Stock Exchange. As of Tuesday's close, U.S.-listed shares of Fresenius were up about 28.2%, Davita's shares were up 22.2%, while Baxter's shares were down about 27% so far this year.

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Persons: Rick Wilking, Ozempic, Danish drugmaker, Veronika Dubajova, Davita, Eli Lilly's, Akash Tewari, Fresenius, Mariam Sunny, Janane Venkatraman, Pooja Desai Organizations: REUTERS, Novo Nordisk's, Citi, Baxter, Jefferies, Fresenius, New York Stock Exchange ., Thomson Locations: Denver, Danish, Fresenius, New York Stock Exchange . Frankfurt, U.S, Bengaluru