Reddit Set to Join S&P 500 and Sun Communities to Join S&P MidCap 400

  NEW YORK, August 13, 2026: S&P Dow Jones Indices will make the following changes to the S&P 500 and S&P MidCap 400: • Reddit Inc. (NYSE: RDDT) will replace AvalonBay Communities Inc. (NYSE: AVB) in the S&P 500 effective prior to the opening of trading on Tuesday, August 18. S&P 500 constituent Equity Residential (NYSE: EQR) is acquiring AvalonBay Communities in a deal expected to be completed soon, pending final conditions. Post merger, the combined company will be renamed Vivmark Residential (NYSE: VMRK) and will remain in the S&P 500. • Sun Communities Inc. (NYSE: SUI) will replace Webster Financial Corp. (NYSE: WBS) in the S&P MidCap 400 effective prior to the opening of trading on Thursday, August 20. Banco Santander S.A. (BMEX / NYSE: SAN) is acquiring Webster Financial in a deal expected to be completed soon pending final conditions. Following is a summary of the changes that will take place prior to the open of trading on the effective date: Effective Date Index Name Action Company Name August 18, 2026 S&P 500 Addition Reddit RDDT Communication Services Ticker GICS Sector August 18, 2026 S&P 500 Deletion AvalonBay Communities AVB August 20, 2026 S&P MidCap 400 Addition Financials Sun Communities SUI Real Estate August 20, 2026 S&P MidCap 400 Deletion Webster Financial WBS Financials ABOUT S&P DOW JONES INDICES S&P Dow Jones Indices is the largest global resource for essential index-based concepts, data and research, and home to iconic financial market indicators, such as the S&P 500® and the Dow Jones Industrial Average®. More assets are invested in products based on our indices than products based on indices from any other provider in the world. Since Charles Dow invented the first index in 1884, S&P DJI has been innovating and developing indices across the spectrum of asset classes helping to define the way investors measure and trade the markets. S&P Dow Jones Indices is a division of S&P Global (NYSE: SPGI), which provides essential intelligence for individuals, companies, and governments to make decisions with confidence. For more information, visit www.spglobal.com/spdji/en/.