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May 26, 2026 4:40 AM

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

The S&P 500 extended its record-setting run on Friday as easing Treasury yields and optimism around a potential resolution to the U.S.-Iran war supported risk appetite, and Polymarket traders are betting the benchmark index will open higher on Tuesday after the Memorial Day holiday.

The S&P 500 rose 0.37% to close at a record 7,473.47 on Friday. The May 26 Polymarket contract implied a 91% probability that the index would open higher when trading resumes on Tuesday.

Why That Number Matters

Investor sentiment improved after President Donald Trump said on Monday that talks with Iran to end the war were "proceeding nicely," boosting hopes that a diplomatic ...