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May 19, 2026 8:00 AM

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

The S&P 500 slipped for a second consecutive session on Monday as weakness in artificial intelligence-linked technology stocks weighed on sentiment, and Polymarket traders are betting the benchmark index could extend its losing streak at Tuesday’s open.

The S&P 500 closed down 0.07% at 7,403.05 on Monday and the May 19 Polymarket contract implied a 40% probability that the S&P 500 would open higher on Tuesday.

Why That Number Matters

The latest pullback comes after a record-setting rally that pushed both the S&P 500 and Nasdaq Composite to all-time highs last week.

Technology stocks, particularly those tied to ...