S&P 500 (SPX) Up or Down on August 28?

According to the latest prediction market data for the query “S&P 500 (SPX) Up or Down on August 28?”, traders have formed a strong consensus.

Currently, Down is dominating the market with an overwhelming 9,700% chance of winning. Up follows in second place at 300%. The betting volume for this specific market has already reached $68.4K, reflecting intense industry interest.

To better assess where each potential outcome stands, the market can be segmented into three distinct trading tiers based on implied probability and contract pricing:

🥇 Tier 1: The Dominant Leader

• Down (9,700%): Currently commanding the highest probability, Down is heavily favored by the order book. Traders looking to back this outcome face a “Buy Yes” contract price of 9,700¢, signaling a high degree of market conviction.

🥈 Tier 2: The Primary Challengers

• Up (300%): Positioned as the most viable alternative, Up maintains a 300% chance of resolving true. Its “Buy Yes” shares currently trade at 300¢.

This market will resolve to "Up" if the official S&P 500 Index closing price for S&P 500 (SPX) on Friday, August 28, 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 Friday, August 28, 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