DocuSign (DOCU) is set to join the S&P MidCap 400 index replacing MDU Resources Group (MDU), effective Oct. 11, the S&P (SPGI) Dow Jones Indices said late Monday.

Meanwhile, MDU Resources Group will be added to the S&P SmallCap 600 to replace Chuy's Holdings (CHUY), which is being acquired by Darden Restaurants (DRI) in a deal expected to be completed soon, according to the index operator.

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