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Jun 11, 2026 8:00 AM

Stock Market: Will S&P 500 Open Up Or Down Today?

The S&P 500 suffered its steepest decline in weeks on Wednesday as escalating tensions with Iran and renewed weakness in semiconductor stocks rattled investors. Despite the selloff, Polymarket traders are betting the benchmark index will rebound at Thursday’s open.

The S&P 500 fell 1.62% to close at 7,266.99 on Wednesday after President Donald Trump threatened further military action against Iran. However, the June 11 Polymarket contract implied a 95% probability that the index will open higher on Thursday.

Why That Number Matters

Markets remain focused on the evolving conflict between the U.S. and Iran, which has become a key driver of oil prices and inflation expectations.

U.S. Central Command said it carried out additional ...