# SPX: options-positioning snapshot

Canonical: https://halfonadouble.com/stock/SPX
Data through: 2026-10-16 close
Publisher: Half on a Double

| Published field | Value |
| --- | --- |
| Close (USD/share) | 7,659.44 |
| Delta neutral (USD/share) | 7,329.78 |
| Gamma neutral (USD/share) | 7,717.72 |
| Gamma max (USD/share) | 8,357.79 |
| Open interest (contracts) | 16,345,434 |
| Nearest-expiration max pain (USD/share) | 7,600.00 (2026-11-20) |
| All-expiration max pain (USD/share) | 7,325.00 |
| Net gamma exposure | -90,967,334 |
| Confirmed GEX flip (USD/share) | 7,717.72 |
| Call wall (USD/share) | 8,000.00 |
| Put wall (USD/share) | 8,000.00 |
| Put/call open-interest ratio | 1.42 |
| Options catalyst-intensity score (0–100) | 41.5 |
| Options directional score (-100 to +100) | -34.3 |
| IV rank | 91.6 |
| Front-minus-back IV | 0.1 pp |
| Front 25-delta risk reversal | 7.1 pp |
| Call OI change, 1 session | -888,839 contracts · -11.6% |
| Put OI change, 1 session | -1,454,992 contracts · -13.2% |
| Call minus put OI growth, 1 session | +1.6 pp |
| Call OI change, 5 sessions | -632,838 contracts · -8.6% |
| Put OI change, 5 sessions | -1,048,401 contracts · -9.9% |
| Call minus put OI growth, 5 sessions | +1.3 pp |
| Daily call OI change surprise | -2.38σ (252 prior changes) |
| Daily put OI change surprise | -2.64σ (252 prior changes) |
| Daily call-minus-put growth surprise | +1.39σ (252 prior changes) |
| Daily open interest change (contracts) | -2,343,831 |
| Daily open interest change z-score (prior 252) | -2.55σ (252 prior changes) |
| Gamma max distance from close | +9.1% |
| Delta neutral distance from close | -4.3% |
| Prior-year sessions closer to gamma max | 86.1% of 252 |
| Prior-year sessions closer to delta neutral | 16.3% of 252 |

## Historical gamma-max cross outcomes

| Direction | Horizon | n | Median | Middle 50% | Above zero | Nominal ≥90% median interval | Confidence floor |
| --- | --- | ---: | ---: | ---: | ---: | ---: | ---: |
| above | Day +1 | 0 | – | – to – | — | — | – |
| above | Day +3 | 0 | – | – to – | — | — | – |
| above | Day +5 | 0 | – | – to – | — | — | – |
| above | Day +10 | 0 | – | – to – | — | — | – |
| below | Day +1 | 0 | – | – to – | — | — | – |
| below | Day +3 | 0 | – | – to – | — | — | – |
| below | Day +5 | 0 | – | – to – | — | — | – |
| below | Day +10 | 0 | – | – to – | — | — | – |

Returns are close-to-close after the labelled number of subsequent trading sessions. Cohorts require gamma max to be within 10% of the close on both crossing sessions. Historical windows can overlap and are not independent observations, so interval coverage is not guaranteed.

- [Machine-readable snapshot](https://halfonadouble.com/api/v1/tickers/SPX.json)
- [Historical CSV](https://halfonadouble.com/api/v1/history/SPX.csv)
- [Public aggregate analysis](https://halfonadouble.com/api/v1/analysis/SPX.json?date=2026-10-16&public_schema=4)

An em dash means unavailable, not zero. Values use the same display rounding as the HTML page. This is a current snapshot; full history and individual event paths are on the canonical page.

[Definitions and limitations](https://halfonadouble.com/methodology.md).