The Trade Desk Falls Amid S&P 500 Index Removal Pressure

The Trade Desk (TTD) fell by 4% on Tuesday as index-removal flows from the S&P 500 continued to pressure its stock. Magnite (MGNI) dropped 3%, while AppLovin (APP) saw a smaller decline of less than one percent, indicating uneven sector impact. The selloff is attributed primarily to mechanical selling triggered by TTD's removal from the large-cap index and inclusion in the S&P SmallCap 600 rather than new company-specific developments. The broader market showed mixed performance with SPY remaining flat while IWM rose slightly, suggesting that the ad-tech sector’s decline was not due to overall weakness. The Trade Desk now trades at a trailing P/E of approximately 13x despite maintaining high customer retention rates above 95% for over ten years. The stock has declined by about 65% year-to-date and is currently trading below typical multiples for its sector, raising questions whether the earnings can support such valuation in future quarters.

By David Moadel Tue, September 22, 2026 at 6:59 PM GMT+3 6 min read · Yahoo Finance ·

The Trade Desk Falls Amid S&P 500 Index Removal Pressure

Tickers: $APP $MGNI $TTD

Topics: ad-tech_sector index_removal_flows stock_price_drop

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