# INSM: options-positioning snapshot

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

| Published field | Value |
| --- | --- |
| Close (USD/share) | 93.39 |
| Delta neutral (USD/share) | 91.05 |
| Gamma neutral (USD/share) | 85.29 |
| Gamma max (USD/share) | 115.33 |
| Open interest (contracts) | 114,858 |
| Nearest-expiration max pain (USD/share) | 97.50 (2026-11-20) |
| All-expiration max pain (USD/share) | 100.00 |
| Net gamma exposure | 2,751,627 |
| Confirmed GEX flip (USD/share) | 85.29 |
| Call wall (USD/share) | 110.00 |
| Put wall (USD/share) | 80.00 |
| Put/call open-interest ratio | 0.52 |
| Options catalyst-intensity score (0–100) | 46.7 |
| Options directional score (-100 to +100) | -14.1 |
| IV rank | 6.7 |
| Front-minus-back IV | 9.8 pp |
| Front 25-delta risk reversal | 13.5 pp |
| Call OI change, 1 session | +4,782 contracts · +6.7% |
| Put OI change, 1 session | -1,321 contracts · -3.3% |
| Call minus put OI growth, 1 session | +10.0 pp |
| Call OI change, 5 sessions | +9,573 contracts · +14.5% |
| Put OI change, 5 sessions | +1,128 contracts · +3.0% |
| Call minus put OI growth, 5 sessions | +11.5 pp |
| Daily call OI change surprise | +1.28σ (252 prior changes) |
| Daily put OI change surprise | -0.40σ (252 prior changes) |
| Daily call-minus-put growth surprise | +2.05σ (252 prior changes) |
| Daily open interest change (contracts) | 3,461 |
| Daily open interest change z-score (prior 252) | +0.50σ (252 prior changes) |
| Gamma max distance from close | +23.5% |
| Delta neutral distance from close | -2.5% |
| Prior-year sessions closer to gamma max | 81.0% of 252 |
| Prior-year sessions closer to delta neutral | 18.3% of 252 |

## Historical gamma-max cross outcomes

| Direction | Horizon | n | Median | Middle 50% | Above zero | Nominal ≥90% median interval | Confidence floor |
| --- | --- | ---: | ---: | ---: | ---: | ---: | ---: |
| above | Day +1 | 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=2026-10-23&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).