Reddit was confirmed as an off-cycle addition to the S&P 500, with the change set to take effect next week. Shares jumped more than 10% in after-hours trading on the news. The addition follows months of speculation that the social media platform would eventually earn a spot in the index.
Index inclusion forces every fund that tracks the S&P 500 to buy Reddit shares, creating a wave of mandatory demand that is largely price-insensitive. That mechanical buying typically pushes a stock higher in the days leading up to and just after the effective date, which matters if you hold RDDT or any broad S&P 500 index fund.
Next week: Reddit's effective inclusion date in the S&P 500, when index funds must complete their purchases. Next RDDT earnings report: watch for the company to provide updated user and revenue metrics that justify the new valuation.
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