8/14/2026
Reddit Is Joining the S&P 500. The 15% Pop Is a Lesson in How Index Inclusion Actually Works.
Reddit (NYSE: RDDT) will join the S&P 500 before markets open on Tuesday, August 18, S&P Dow Jones Indices announced Thursday, sending shares as much as 15% higher in after-hours and premarket trading. The stock will replace AvalonBay Communities, which is exiting the index following its acquisition by fellow S&P 500 member Equity Residential, a deal shareholders overwhelmingly approved this week. The combined entity will drop both legacy names and begin trading as Vivmark Residential once the transaction closes.
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