Gulfport Energy and Mobility Global Set to Join S&P SmallCap 600

NEW YORK, June 26, 2026 /PRNewswire/ -- S&P Dow Jones Indices will make the following changes to the S&P SmallCap 600: Gulfport Energy Corp. (NYSE: GPOR) will replace Select Medical Holdings Corp. (NYSE: SEM) effective prior to the opening of trading on Wednesday, July 1. Select Medical...