# What will S&P 500 (SPX) hit by end of December? The S&P 500 title mentions December, but its written window begins at market creation. The touch question also differs from predicting the index’s final December close. Canonical article: https://www.homeincomelab.com/stories/spx-hit-dec-2026 Publisher: The Outlook By: The Outlook editorial desk Category: Economy Analysis as of: 2026-10-04T09:57:48.323Z Decision guide market prices observed: 2026-10-04T09:57:48.323Z Published: 2026-10-04T09:57:48.323Z ## Quick answer The S&P 500 title mentions December, but its written window begins at market creation. The leading open contract, “↓ $7,400”, was priced at 67% for Yes in the October 4 snapshot. A finalized Yahoo Finance one-minute SPX high or low must reach or pass the child strike during regular trading hours. [1](https://polymarket.com/event/spx-hit-dec-2026) ## Key takeaways - A finalized Yahoo Finance one-minute SPX high or low must reach or pass the child strike during regular trading hours. [1](https://polymarket.com/event/spx-hit-dec-2026) - The S&P 500 title mentions December, but its written window begins at market creation. - Creation through the last regular trading close of December 2026. If fallback data is still absent December 31 at 11:59 p.m. ET, use available observations. [1](https://polymarket.com/event/spx-hit-dec-2026) ## The question behind the headline The S&P 500 title mentions December, but its written window begins at market creation. The touch question also differs from predicting the index’s final December close. At the October 4, 2026 market snapshot, ↓ $7,400 carried a 67% Yes price. Other open contracts included ↑ $8,000 at 54.5%; ↓ $7,200 at 48.5%. [1](https://polymarket.com/event/spx-hit-dec-2026) ## The condition that changes the answer A finalized Yahoo Finance one-minute SPX high or low must reach or pass the child strike during regular trading hours. If unavailable, the fallback order is WSJ Markets, Google Finance, then MarketWatch. [1](https://polymarket.com/event/spx-hit-dec-2026) Creation through the last regular trading close of December 2026. If fallback data is still absent December 31 at 11:59 p.m. ET, use available observations. [1](https://polymarket.com/event/spx-hit-dec-2026) ## Evidence for and against the leading outcome A qualifying regular-session candle crossing the selected threshold supports Yes regardless of later reversal. An after-hours indication or a correct year-end direction without the specified touch can leave the contract at No. The next useful checks are written window rather than title shorthand; regular-session one-minute candles; ordered fallback data sources. The linked primary references make the process and named data source inspectable. [2](https://finance.yahoo.com/quote/%5EGSPC/)[3](https://www.nyse.com/markets/hours-calendars) ## A closer look at the market These child contracts can overlap: different dates, thresholds or people do not necessarily describe mutually exclusive alternatives. Their Yes prices should not be added into a single winner probability, and the highest Yes price is not automatically the most informative question. The event had approximately $394,813 in total traded volume at observation. That is a record of turnover across this event, not a count of distinct people, a search-volume estimate or proof that every child contract is easy to trade. The analytical quote is fixed to the timestamp shown here; later live prices can differ. [1](https://polymarket.com/event/spx-hit-dec-2026) The useful conclusion is conditional: check the exact milestone before interpreting the price as a view on the larger story. ## A fact worth knowing The written start is market creation, not necessarily December 1. Source: [Polymarket — event, child contracts and resolution rules](https://polymarket.com/event/spx-hit-dec-2026) ## Weighing the outcome ### Outcome in focus ↓ $7,400 — Yes ### Supporting case A qualifying regular-session candle crossing the selected threshold supports Yes regardless of later reversal. ### Challenging case An after-hours indication or a correct year-end direction without the specified touch can leave the contract at No. ### What to watch - Written window rather than title shorthand - Regular-session one-minute candles - Ordered fallback data sources ### What may already be priced in The analysis starts from 67% for the Yes side of “↓ $7,400”. A view merely agreeing that this is plausible does not show that the price understates it. The probability, rule and remaining time all have to be compared. [1](https://polymarket.com/event/spx-hit-dec-2026) ### Assessment The useful conclusion is conditional: check the exact milestone before interpreting the price as a view on the larger story. ## How the market resolves A finalized Yahoo Finance one-minute SPX high or low must reach or pass the child strike during regular trading hours. If unavailable, the fallback order is WSJ Markets, Google Finance, then MarketWatch. [1](https://polymarket.com/event/spx-hit-dec-2026) ## Timing and deadline Creation through the last regular trading close of December 2026. If fallback data is still absent December 31 at 11:59 p.m. ET, use available observations. [1](https://polymarket.com/event/spx-hit-dec-2026) ## Questions and answers ### What exactly would settle this market? A finalized Yahoo Finance one-minute SPX high or low must reach or pass the child strike during regular trading hours. If unavailable, the fallback order is WSJ Markets, Google Finance, then MarketWatch. [1](https://polymarket.com/event/spx-hit-dec-2026) ### What is the deadline, and can settlement come later? Creation through the last regular trading close of December 2026. If fallback data is still absent December 31 at 11:59 p.m. ET, use available observations. [1](https://polymarket.com/event/spx-hit-dec-2026) ### Does the quoted probability show an advantage? No. 67% is the observed Yes price for “↓ $7,400”, not a verified probability from independent research. A useful assessment needs evidence that changes the expected chance under the exact rules, plus the actual price available at the time. [1](https://polymarket.com/event/spx-hit-dec-2026) ## Related market contracts - [↓ $7,400](https://polymarket.com/event/spx-hit-dec-2026/spx-hit-7400-low-dec-2026) - [↑ $8,000](https://polymarket.com/event/spx-hit-dec-2026/spx-hit-8000-high-dec-2026) - [↓ $7,200](https://polymarket.com/event/spx-hit-dec-2026/spx-hit-7200-low-dec-2026) ## Market source [View the event on Polymarket](https://polymarket.com/event/spx-hit-dec-2026) For timestamped market prices, see the canonical HTML article. Prices can change independently of this analysis. ## Sources and further reading 1. [Polymarket — event, child contracts and resolution rules](https://polymarket.com/event/spx-hit-dec-2026) 2. [finance.yahoo.com — specified data source](https://finance.yahoo.com/quote/%5EGSPC/) 3. [nyse.com — official source](https://www.nyse.com/markets/hours-calendars) This is AI-assisted, source-linked explanatory journalism. We distinguish facts from interpretation and revise material errors. 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