Reddit officially joined the S&P 500 on August 13, with the change taking effect before markets open on August 18, 2026. This off-cycle addition was triggered by AvalonBay Communities’ pending acquisition by Equity Residential. Shares jumped 11% in after-hours trading, though the stock was still down 31.2% year-to-date. With a market capitalization of approximately $29.5 billion, Reddit becomes the second pure-play social media company in the index, alongside Meta. Analysts remain cautious about AI-related risks that could alter user behavior and impact the company’s advertising model.
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