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S&P 500 (SPX) Up or Down on October 19?
polymarket

S&P 500 (SPX) Up or Down on October 19?

Volume:
$164,019

S&P 500 (SPX) Up or Down on October 19?

 - Polymarket

S&P 500 (SPX) Up or Down on October 19? - Polymarket

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Resolved Oct 19, 2026

Closed: Oct 19, 6:30 PM EST

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S&P 500 (SPX) Up or Down on October 19?

View
100%
44%
Yes 100¢No 0¢
—
N/A
$164,019
N/A
N/A
N/A
Settled
Yes
Total markets: 1

Description

This market will resolve to "Up" if the official S&P 500 Index closing price for S&P 500 (SPX) on Monday, October 19, 2026 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 closing price for S&P 500 (SPX) on Monday, October 19, 2026 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 specified closing 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 closing price published by S&P 500 Index for that shortened session will still be used for resolution. If either of the relevant days have 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 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

Polymarket

This market will resolve to "Up" if the official S&P 500 Index closing price for S&P 500 (SPX) on Monday, October 19, 2026 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 closing price for S&P 500 (SPX) on Monday, October 19, 2026 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 specified closing 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 closing price published by S&P 500 Index for that shortened session will still be used for resolution. If either of the relevant days have 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 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

On Polymarket, the dashboard for the S&P 500 direction market displays the current odds of the S&P 500 closing up or down on October 19. It also provides a price history chart, allowing users to see how the probabilities have shifted over time. You can view the 24-hour trading volume, currently at $161,986, which indicates the level of recent activity in this market. Total volume to date is $163,955, showing overall interest. This information helps traders assess market sentiment and make informed decisions.

Currently, prediction market odds offer a distinct perspective when compared to traditional analyst forecasts for the S&P 500. While analysts often provide point estimates or ranges, this market aggregates the wisdom of the crowd, expressing probabilities for an up or down move. It’s important to note that analysts’ predictions can be influenced by biases or specific methodologies, whereas this market reflects a broader range of opinions and real-time information. Examining the difference between these viewpoints can provide a more comprehensive understanding of potential market movements.

On Polymarket, this market is priced through a continuous auction mechanism where traders buy and sell shares representing their belief about the S&P 500’s direction. The price of these shares directly reflects the probability of the S&P 500 closing up or down on October 19. On Polymarket, prices reflect that venue's order book, liquidity, and how traders price the outcome right now. As more traders participate, the price adjusts to reflect the collective intelligence of the market. The higher the demand for shares predicting an increase, the higher the price, and vice versa. This dynamic pricing ensures the market remains responsive to new information and changing sentiment.

This market resolves around Oct 19, 2026, with the outcome confirmed once the event is verifiable from credible public reporting. Specifically, the resolution will be based on whether the S&P 500 index closes higher or lower than its opening value on October 19. The final closing price will be sourced from a widely recognized financial data provider. Traders will then be able to claim their winnings or settle their losing positions based on the verified outcome. The market’s resolution is designed to be transparent and objective.

Several key signals and events could significantly move this market before Oct 19, 2026. Major economic data releases, such as inflation reports or employment figures, often trigger market reactions. Unexpected geopolitical events or shifts in Federal Reserve policy could also have a substantial impact. Corporate earnings announcements from large S&P 500 companies are another important catalyst. Furthermore, any surprising news regarding interest rates, global economic growth, or major regulatory changes could influence traders’ sentiment and shift the probabilities reflected in this market.