S&P 500 Falls 4.36% on AI Rout; Positive-Year Odds Slip to 86%

The S&P 500 is still on track to finish 2026 positive, even after a 4.36% drop on Nov. 5 to 7,353.73. On Kalshi, Positive Growth in "Will the S&P finish positive this year?" slipped from 90% to 86% over three days, its lowest level in that window, as of Nov. 6. The index needs to close Dec. 31 above 6,845.50, its 2025 finish, and sits about 508 points (roughly 7.4%) above that line.

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What Triggered the S&P 500's Nov 5 Drop: Midterm Results and AI Data-Center Pledges

Democrats won House and Senate majorities in the Nov. 3 midterms. In Texas, Senate winner James Talarico told supporters, "We will definitely rein in data centers," and promised to end tax breaks for developers, according to Seoul Economic Daily. The same report cited an estimate that about 45% of planned U.S. data-center projects could be affected and that 10% to 15% could be scrapped.

The reversal came one day after a relief rally on hopes of gridlock. The S&P 500 lost 334.89 points, the Nasdaq fell 5.52% to 24,315.00, and the Dow shed 1,833.06 points to 51,523.06. The Nasdaq and S&P 500 posted their steepest declines since April 2, 2025, when reciprocal tariffs were announced. The VIX hit 28.09 intraday, its highest since late March. The S&P 500 erased three months of gains, per Seoul Economic Daily. CNBC reported that the Magnificent 7 lost $1 trillion in value, and the Associated Press tied the rout to AI stocks following the election.

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How Far the S&P 500 Would Need to Fall to Turn the Year Negative

The math is straightforward: 7,353.73 minus 6,845.50 equals 508.23 points. Measured from Thursday's close, that is a 6.9% decline. Measured against the threshold, the index sits 7.4% above it. A 4.36% drop to 7,353.73 implies a Nov. 4 close of roughly 7,689, which matches the reported 7,688.62.

As illustrative arithmetic, not a forecast: a second 4.36% day would leave the index near 7,033, still above the line. Breaching 6,845.50 would take about 1.6 sessions of that size, or a steady grind lower across the roughly eight weeks left until Dec. 31. The 86% implies such a path unfolds less than one time in seven.

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What Could Confirm or Reverse the Move in S&P 500 Positive-Year Odds

Strategists disagree on what Thursday's drop means. Ed Yardeni described it as an AI bubble losing air rather than bursting. Others, cited by Seoul Economic Daily, expect Democrats to compromise with the industry given U.S.-China competition. Concrete signs of that compromise would support a recovery toward 90%. Futures were still dipping early Nov. 6 as the Nasdaq sat in correction territory, per Yahoo Finance.

The next dated catalyst is the Fed's Dec. 8-9 meeting, where rate-hike odds fell to about 60% after the selloff. The contract settles on the Dec. 31 close against 6,845.50. Live pricing is on the S&P 500 positive-year market page.