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. BancoSantander S.A. (BMEX / NYSE: SAN) is acquiring Webster Financial in a deal expected to becompleted soon pending final conditions.

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
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