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

PR Newswire
Today at 10:12pm UTC

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

PR Newswire

NEW YORK, Aug. 13, 2026

NEW YORK, Aug. 13, 2026 /PRNewswire/ -- 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

Ticker

GICS Sector

August 18, 2026

S&P 500

Addition

Reddit

RDDT

Communication Services

August 18, 2026

S&P 500

Deletion

AvalonBay Communities

AVB

Financials

August 20, 2026

S&P MidCap 400

Addition

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/.

FOR MORE INFORMATION:

S&P Dow Jones Indices
index_services@spglobal.com 

Media Inquiries
spdji.comms@spglobal.com 

Cision View original content:https://www.prnewswire.com/news-releases/reddit-set-to-join-sp-500-and-sun-communities-to-join-sp-midcap-400-302851432.html

SOURCE S&P Dow Jones Indices