Finance · Polymarket

S&P 500 (SPX) Up or Down on October 16?

As of Oct 15, 2026, traders on Polymarket price this market at 52%. RocketScience's forecast is 52%, 0.3 points above the market, and our call is Not sure. The gap is too small to act on, so the signal is Hold.

Market odds: 52%
Our forecast: 52%
Call: Not sure
Signal: Hold
Closes: Oct 22, 2026 (6d 22h)
Volume: –
Exchange: Polymarket

Open the live chart Trade on Polymarket ↗

Why we think this

News: Neutral across 25 recent articles.

Latest headlines

Hotter Inflation and AI Weakness End the S&P 500’s Run Without a 1% Drop — RealMoney Pro
LIVE MARKETS-S&P 500 futures red after hot CPI data pushes yields higher — Bitget
S&P 500’s Narrow Rally Faces Fresh Tests From CPI, Bank Earnings: 3 Charts To Watch This Week — TradingView
S&P 500 Rises As Bulls Load Up On Big Cap AI Stocks — Seeking Alpha
Dow, S&P 500, Nasdaq Decline Amid Hot Inflation Data, AI Selloff: CRWV, NBIS, NVDA, IBRX Stocks In Focus — TradingView
HSBC Sees a Surprise Driver for the Next Stock Rally — TradingView

Frequently asked questions

What are the odds for “S&P 500 (SPX) Up or Down on October 16?”?

Traders on Polymarket price it at 52%. RocketScience forecasts 52% (Not sure), updated Oct 15, 2026.

What is RocketScience's prediction for “S&P 500 (SPX) Up or Down on October 16?”?

Our call is Not sure at 52%. We say YES at 60% or more, NO at 40% or less, and Not sure in between.

When does this market close?

It closes on Oct 22, 2026 (UTC).

How is the forecast made?

We start from the live exchange price, filter out noise, add the direction of recent news (and a spot-price model for crypto), and re-forecast instantly when the odds jump.

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Last updated 2026-10-15 13:00 UTC. Forecasts are for research only, not financial advice.