Reddit jumps 14% after S&P 500 inclusion, replacing AvalonBay
S&P Dow Jones Indices will add Reddit to the S&P 500, replacing AvalonBay, effective before the Aug 18 open. The announcement triggered a sharp rally and unusually high volume, reflecting forced buying by passive index trackers (J.P. Morgan estimates ~16.7M shares). Near-term market impact is concentrated in index-linked flows and rebalancing dynamics rather than broad macro conditions.
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S&P Dow Jones Indices said Reddit will join the S&P 500, replacing AvalonBay Communities. Following the announcement, Reddit shares were up more than 11% at $175.69, with trading volume nearly three times the daily average. The stock is down more than 31% year to date and more than 42% below its all-time high reached in September 2025.