# S&P 500 (SPX) Opens Up or Down on May 7?

> Polymarket binary prediction market. 100% implied probability of YES as of Thu, 07 May 2026 22:14:59 GMT. 24h change +70.0pp, 24h volume $208.5K.

**Canonical URL:** https://orrery.me/markets/spx-opens-up-or-down-on-may-7-2026
**Polymarket source:** https://polymarket.com/event/spx-opens-up-or-down-on-may-7-2026
**Category:** Macro
**Resolves by:** May 7, 2026
**Last fetched:** 2026-05-07T22:14:59.076Z

## Live snapshot

| Metric | Value |
|---|---|
| YES probability | **100¢** (100%) |
| Δ 1h | +0.0pp |
| Δ 24h | +70.0pp |
| Δ 1w | +0.0pp |
| 24h volume | $208.5K |
| Lifetime volume | $209.8K |
| Liquidity (orderbook depth) | $80.6K |
| Spread | 0.10pp |
| UMA status | `proposed` |

## Resolution

**Resolves by:** May 7, 2026

**Source:** https://www.wsj.com/market-data/stocks

**UMA status:** `proposed` — verify before treating moves as new information.

### Market description (verbatim from Polymarket)

> This market will resolve to "Up" if the official S&P 500 Index open price for S&P 500 (SPX) on May 7 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 open price for S&P 500 (SPX) on May 7 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 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 open/close price published by S&P 500 Index for that shortened session will still be used for resolution.
> 
> If the previous trading day has 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 Open/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

## Active signals

Signals are deterministic rules with explicit confidence (0..1). They describe *why a price moved* — they are not trade recommendations and do not predict the outcome.

- **resolution_risk** (confidence 65%): Market has reached expiry. Watch the UMA dispute window.

## Top holders

**Top YES holders**

- `0x1295…5cfd` — 116,848.84 shares
- `0x8bc8…97dc` — 10,000 shares
- `0x94bd…6184` — 9,894.76 shares
- `0x2763…dac7` — 1,269.219 shares
- `0xe428…50bf` — 1,155 shares

**Top NO holders**

- `0xef53…0d14` — 100,000 shares
- `0x264c…baca` — 10,539.444 shares
- `0xd25b…9f3d` — 10,010.01 shares
- `0x966e…609c` — 5,000 shares
- `0x4207…b81b` — 4,532.278 shares

## 7-day price-history summary

| Metric | Value |
|---|---|
| Sample count | 35 |
| Window start | 2026-05-06T13:00:05.000Z |
| Window end | 2026-05-07T22:14:05.000Z |
| Range | 33¢ → 100¢ |
| Net change | +49.0pp |

Full series available as JSON via `GET https://orrery.me/api/markets?slugs=spx-opens-up-or-down-on-may-7-2026` — the chart on the human page is rendered from this same data.

## Cite this

```
Orrery. "S&P 500 (SPX) Opens Up or Down on May 7? — 100% on Polymarket."
Retrieved 2026-05-07T22:14:59.076Z from https://orrery.me/markets/spx-opens-up-or-down-on-may-7-2026.
```

---

*Orrery is a public, read-only intelligence terminal for prediction markets. Not affiliated with Polymarket. Not investment, legal, or tax advice. Numbers are fetched live; citation timestamp matters. See <https://orrery.me/disclaimer>.*