ACM Research Set to Join S&P SmallCap 600

Group 1 - ACM Research Inc. (NASD: ACMR) will be added to the S&P SmallCap 600 index effective September 26, 2025, replacing WK Kellogg Co. (NYSE: KLG) [1] - The acquisition of WK Kellogg by the Ferrero Group is expected to close soon, pending final closing conditions [1] - The changes will take effect prior to the opening of trading on the specified date [1]