S&P 500 (SPX) Opens Up or Down on September 14?

As of today the market prices S&P 500 (SPX) Opens Up or Down on September 14 at 61% — that is what traders are paying, in real money, for a share that pays $1.00 if it happens.

S&P 500 (SPX) Opens Up or Down on September 14? odds

OutcomeChancePriceVolume
S&P 500 (SPX) Opens Up or Down on September 14?61%61¢

Market details

Resolution rules

This market will resolve to "Up" if the official S&P 500 Index open price for S&P 500 (SPX) on September 14 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 September 14 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

Frequently Asked Questions

What are the current odds for S&P 500 (SPX) Opens Up or Down on September 14??
The market currently prices this at 61% (61¢ per share). Odds update continuously as traders buy and sell on Polymarket.
Will S&P 500 (SPX) Opens Up or Down on September 14?
S&P 500 (SPX) Opens Up or Down on September 14? is the market favorite at 61%, based on real money wagered by Polymarket traders. Prediction-market odds have historically tracked outcomes more closely than polls, but they are a forecast, not a guarantee.
When does S&P 500 (SPX) Opens Up or Down on September 14? resolve?
This market is scheduled to resolve on September 14, 2026. Winning shares pay out $1.00 each; losing shares expire worthless.
How does S&P 500 (SPX) Opens Up or Down on September 14? resolve?
This market will resolve to "Up" if the official S&P 500 Index open price for S&P 500 (SPX) on September 14 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 September 14 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
Where can I bet on S&P 500 (SPX) Opens Up or Down on September 14?
This is a Polymarket prediction market — you trade YES/NO shares against other users rather than against a bookmaker. Polynter.net tracks the odds, volume and trader activity; trading itself happens on Polymarket.

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