S&P 500 Flat as AI Trade Powers Market, Futures Pause — SkimNews
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- S&P 500, Nasdaq, and Dow ended little changed on September 21, 2026, as the AI trade continued to drive market direction, per Yahoo Finance.
- Wall Street futures paused the day after the S&P 500 posted its best session since early August, with focus shifting to Mideast tensions, per Reuters.
Why it matters: The gap between flat closing action on September 21 and the S&P 500's strongest day since early August suggests markets are digesting a sharp rally, while the AI trade remains the named driver and Mideast tensions emerge as the competing risk for investor attention.
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