S&P 500 be above 6845.5 on Dec 31, 2026 priced at 91% on Kalshi, up 1 point, on $1.3M traded

The Kalshi contract asking whether the S&P 500 will be above 6845.5 on Dec 31, 2026 was priced at 91%, up 1 percentage point, with $1.3M traded, in the Oct 17, 2026 update published at 6:39 AM ET.

The accompanying news summary reported no significant new platform headline in the preceding 15 minutes. It therefore offers no fresh reported catalyst for the move.

Reading the market snapshot

According to predictionbubbles.net, its finance dashboard reports market-implied probabilities, changes over the previous 24 hours and total traded volume. The probability measures the price assigned to a “yes” outcome; the volume figure is cumulative trading activity, not the amount traded during the latest quarter-hour.

The site refreshes its data every 15 minutes, while trading on the underlying venues continues between updates. The 91% reading is consequently a snapshot rather than a fixed forecast.

Broader finance-market context

According to predictionbubbles.net, the dashboard currently tracks 192 finance markets: 20 on Kalshi and 172 on Polymarket. It ranks markets separately by total volume and by the absolute size of their 24-hour probability changes, distinguishing trading activity from repricing.

At its latest refresh, the site identified the Polymarket contract on whether Fed interest rates would remain unchanged after the October 2026 meeting as its most-traded finance market, with $13.4M traded. That is a separate outcome from the S&P 500 threshold, not a directly comparable probability.

What it means for prediction markets

• Strongly tilted pricing: The 91% reading assigns a high market-implied likelihood to the S&P 500 exceeding 6845.5 on Dec 31, 2026, but does not establish the outcome.
• Limited evidence of a catalyst: The 1-percentage-point increase comes alongside a summary reporting no significant new platform headline in the latest 15-minute window.
• Volume and timing matter: The $1.3M figure represents total traded volume; it does not show how much trading drove the latest change.
• Compare contract terms, not just prices: According to predictionbubbles.net, related Kalshi and Polymarket markets can differ in wording, resolution rules and deadlines.