S&P 500 (SPX) Opens Up or Down on October 5?

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24h volumeUnavailable

Total volumeUnavailable

Liquidity$54

Event end date · UTCOct 5, 2026

Price history

Market probability

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Polymarket · UTC

Sampled market observations, not AI forecasts. Lines connect available observations. Legend values are current provider quotes; chart points may be older.

Outcomes & resolution rules

1 market

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S&P 500 (SPX) Opens Up or Down on October 5?Accepting ordersMarket odds50%

S&P 500 (SPX) Opens Up or Down on October 5?

Up50%Polymarket estimate

Down50%Polymarket estimate

Liquidity: $54
Deadline · UTC: Oct 5, 2026
Up bid / ask: 40.0¢ / 60.0¢
Trading fees: Enabled · verify on Polymarket

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Resolution rules

This market will resolve to "Up" if the official S&P 500 Index open price for S&P 500 (SPX) on October 5 is higher than the official S&P 500 Index closing price for SPX on the most recent prior trading day. This market will resolve to "Down" if the official S&P 500 Index open price for S&P 500 (SPX) on October 5 is lower than the official S&P 500 Index closing price for SPX on the most recent prior trading day. E.g., ordinarily, a market on Monday would refer to the previous Friday for its most recent closing price, unless that Friday were a market holiday, in which case it would refer to Thursday, or the next most recent trading day. If the two prices are exactly equal, this market will resolve 50-50. Note that all figures will be rounded to the nearest cent using standard rounding. If SPX does not trade at all during the regular session, the market will resolve 50-50. If either of the relevant days are shortened (for example, due to a market holiday schedule), the official open/close price published by S&P 500 Index for that shortened session will still be used for resolution. If the previous trading day has no official closing price (for example, due to a trading halt into the market close, system issue, delisting, or other disruption), the market will use the last valid on-exchange trade price of the regular session as the effective closing price. The resolution source for this market is the Wall Street Journal, specifically the Open/Close values published by the WSJ under "Historical Prices". US: https://www.wsj.com/market-data/stocks EMEA: https://www.wsj.com/market-data/stocks/emea ASIA: https://www.wsj.com/market-data/stocks/asia