TOTAL VOLUME:

$134.2b

24H VOL:

$134,145,987

24H TRANSACTIONS:

2,388,728,490

OPEN INTEREST:

$1,441,166,947

406,422

Markets across

30,383

events

MATCHED EVENTS:

2,688

PLATFORM COVERAGE:

5

Polymarket:

39%

VS.

Kalshi:

61%

BETA
Dashboards
Insights
Indices
Tour
All
Trending
Breaking
New
Ending Soon
Politics
Sports
Crypto
Companies
Elections
Financials
Economics
Other
Entertainment
Science and Technology
S&P 500 (SPX) Opens Up or Down on May 28?
polymarket

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

Volume:
$59,069

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

 - Polymarket

S&P 500 (SPX) Opens Up or Down on May 28? - Polymarket

1W

News

Positive

Negative

Neutral

Hover marker for details

Vol.

·

Resolved May 28, 2026

Closed: May 28, 4:00 PM EST

polymarket

Polymarket

View
Outcome
Trade
Chance %
Price
Spread
Liquidity
Volume
24h
7d
Open Interest
Ends in
Result
polymarket

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

View
0%
Yes 0¢No 100¢
—
N/A
$59,069
N/A
N/A
N/A
Settled
Yes
Total markets: 1

Intro

This market tracks whether the S&P 500 will open higher or lower compared to the previous trading day's close on May 28. On Polymarket, the leading outcome currently stands at 0.0%. Resolution will be determined by comparing the official opening price on May 28 against the most recent prior trading day's closing price, as reported by the Wall Street Journal market data. Traders should monitor market sentiment and overnight futures activity leading up to the May 28 market open.

Frequently asked questions

Prediction market odds on Polymarket reflect real-money trader conviction and often incorporate forward-looking sentiment that traditional analyst forecasts may lag. While equity analysts typically focus on longer-term price targets and fundamental valuations, prediction markets price the specific binary outcome of SPX opening direction on May 28. Market odds aggregate dispersed information from thousands of traders and update instantly, whereas analyst consensus reports are published periodically. Comparing the two reveals whether professional forecasters and decentralized traders align on near-term market direction.

The market resolves on May 28, 2026, after the S&P 500 opens for trading on May 28. The outcome is determined by whether the SPX opening price is higher or lower than the previous trading day's close. This is an objective, verifiable data point captured at market open, eliminating ambiguity. Once the opening print is confirmed, the winning outcome is settled and traders receive payouts proportional to their correct position size. Resolution typically occurs within hours of the market open.

Overnight economic data, Federal Reserve communications, earnings surprises, and global market movements can shift SPX opening direction odds significantly. Major geopolitical developments, inflation reports, or unexpected corporate news released after the previous close may influence pre-market sentiment. Futures trading in Asia and Europe often telegraph U.S. equity direction before the SPX opens. Volatility spikes, credit market stress, or shifts in interest rate expectations can also swing trader positioning. Monitor financial news and futures contracts closely in the hours leading up to May 28 market open for catalysts that reshape probabilities.