# INSM: options-positioning snapshot

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

| Published field | Value |
| --- | --- |
| Close (USD/share) | 96.27 |
| Delta neutral (USD/share) | 93.98 |
| Gamma neutral (USD/share) | 89.79 |
| Gamma max (USD/share) | 121.51 |
| Open interest (contracts) | 104,157 |
| Nearest-expiration max pain (USD/share) | 105.00 (2026-11-20) |
| All-expiration max pain (USD/share) | 105.00 |
| Net gamma exposure | 1,931,893 |
| Confirmed GEX flip (USD/share) | 89.79 |
| Call wall (USD/share) | 130.00 |
| Put wall (USD/share) | 80.00 |
| Put/call open-interest ratio | 0.58 |
| Options catalyst-intensity score (0–100) | 51.0 |
| Options directional score (-100 to +100) | -6.3 |
| IV rank | 100.0 |
| Front-minus-back IV | 0.0 pp |
| Front 25-delta risk reversal | 5.5 pp |
| Call OI change, 1 session | -4,164 contracts · -5.9% |
| Put OI change, 1 session | -614 contracts · -1.6% |
| Call minus put OI growth, 1 session | -4.3 pp |
| Call OI change, 5 sessions | -398 contracts · -0.6% |
| Put OI change, 5 sessions | +511 contracts · +1.4% |
| Call minus put OI growth, 5 sessions | -2.0 pp |
| Daily call OI change surprise | -1.15σ (252 prior changes) |
| Daily put OI change surprise | -0.15σ (252 prior changes) |
| Daily call-minus-put growth surprise | -0.86σ (252 prior changes) |
| Daily open interest change (contracts) | -4,778 |
| Daily open interest change z-score (prior 252) | -0.69σ (252 prior changes) |
| Gamma max distance from close | +26.2% |
| Delta neutral distance from close | -2.4% |
| Prior-year sessions closer to gamma max | 89.3% of 252 |
| Prior-year sessions closer to delta neutral | 15.9% of 252 |

## Historical gamma-max cross outcomes

| Direction | Horizon | n | Median | Middle 50% | Above zero | Nominal ≥90% median interval | Confidence floor |
| --- | --- | ---: | ---: | ---: | ---: | ---: | ---: |
| above | Day +1 | 30 | +0.5% | -1.5% to +1.4% | 57% | -0.3% to +0.8% | 0.0% |
| above | Day +3 | 30 | -1.3% | -3.3% to +1.6% | 37% | -3.0% to +0.0% | 0.0% |
| above | Day +5 | 30 | -1.4% | -5.3% to +1.1% | 30% | -4.5% to -0.6% | -0.6% |
| above | Day +10 | 30 | -1.9% | -7.9% to +3.2% | 40% | -7.1% to +0.8% | 0.0% |
| below | Day +1 | 34 | -0.9% | -2.3% to +1.5% | 32% | -2.2% to -0.1% | -0.1% |
| below | Day +3 | 34 | -1.6% | -5.1% to +1.6% | 38% | -3.7% to +0.9% | 0.0% |
| below | Day +5 | 34 | -1.5% | -5.6% to +1.1% | 41% | -3.7% to +0.7% | 0.0% |
| below | Day +10 | 34 | -3.9% | -7.6% to +0.7% | 32% | -5.4% to 0.0% | 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/INSM.json)
- [Historical CSV](https://halfonadouble.com/api/v1/history/INSM.csv)
- [Public aggregate analysis](https://halfonadouble.com/api/v1/analysis/INSM.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).