# GMAB: options-positioning snapshot

Canonical: https://halfonadouble.com/stock/GMAB
Data through: 2026-10-23 close
Publisher: Half on a Double

| Published field | Value |
| --- | --- |
| Close (USD/share) | 43.79 |
| Delta neutral (USD/share) | 32.88 |
| Gamma neutral (USD/share) | 27.41 |
| Gamma max (USD/share) | 45.36 |
| Open interest (contracts) | 101,885 |
| Nearest-expiration max pain (USD/share) | 35.00 (2026-11-20) |
| All-expiration max pain (USD/share) | 30.00 |
| Net gamma exposure | 7,294,595 |
| Confirmed GEX flip (USD/share) | 27.41 |
| Call wall (USD/share) | 40.00 |
| Put wall (USD/share) | 35.00 |
| Put/call open-interest ratio | 0.31 |
| Options catalyst-intensity score (0–100) | 48.2 |
| Options directional score (-100 to +100) | -4.8 |
| IV rank | 15.8 |
| Front-minus-back IV | 3.3 pp |
| Front 25-delta risk reversal | 14.2 pp |
| Call OI change, 1 session | +174 contracts · +0.2% |
| Put OI change, 1 session | +1,018 contracts · +4.4% |
| Call minus put OI growth, 1 session | -4.2 pp |
| Call OI change, 5 sessions | +3,714 contracts · +5.0% |
| Put OI change, 5 sessions | +6,264 contracts · +35.4% |
| Call minus put OI growth, 5 sessions | -30.4 pp |
| Daily call OI change surprise | -0.04σ (252 prior changes) |
| Daily put OI change surprise | +1.05σ (252 prior changes) |
| Daily call-minus-put growth surprise | -0.31σ (200 prior changes) |
| Daily open interest change (contracts) | 1,192 |
| Daily open interest change z-score (prior 252) | +0.22σ (252 prior changes) |
| Gamma max distance from close | +3.6% |
| Delta neutral distance from close | -24.9% |
| Prior-year sessions closer to gamma max | 21.4% of 252 |
| Prior-year sessions closer to delta neutral | 53.2% of 252 |

## Historical gamma-max cross outcomes

| Direction | Horizon | n | Median | Middle 50% | Above zero | Nominal ≥90% median interval | Confidence floor |
| --- | --- | ---: | ---: | ---: | ---: | ---: | ---: |
| above | Day +1 | 47 | +0.2% | -0.7% to +1.3% | 55% | -0.2% to +0.6% | 0.0% |
| above | Day +3 | 47 | +1.0% | -0.4% to +2.6% | 66% | +0.3% to +1.9% | +0.3% |
| above | Day +5 | 47 | +0.8% | -1.1% to +3.3% | 64% | +0.0% to +1.7% | +0.0% |
| above | Day +10 | 47 | +0.5% | -2.1% to +4.8% | 60% | -1.1% to +3.5% | 0.0% |
| below | Day +1 | 45 | +0.1% | -0.9% to +1.1% | 51% | -0.4% to +0.5% | 0.0% |
| below | Day +3 | 45 | +0.7% | -1.3% to +2.7% | 58% | -0.4% to +1.8% | 0.0% |
| below | Day +5 | 45 | +1.0% | -1.1% to +2.8% | 64% | +0.0% to +1.7% | +0.0% |
| below | Day +10 | 45 | +0.3% | -2.7% to +3.9% | 56% | -1.2% to +3.3% | 0.0% |

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/GMAB.json)
- [Historical CSV](https://halfonadouble.com/api/v1/history/GMAB.csv)
- [Public aggregate analysis](https://halfonadouble.com/api/v1/analysis/GMAB.json?date=2026-10-23&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).