NEW YORK, Oct. 13, 2023 /PRNewswire/ — S&P Dow Jones Indices will make the following changes to the S&P 500, S&P MidCap 400, and S&P SmallCap 600 indices effective prior to the opening of trading on Wednesday, October 18: Lululemon Athletica Inc. (NASD:LULU) will replace Activision…