# ACHR: options-positioning snapshot

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

| Published field | Value |
| --- | --- |
| Close (USD/share) | 4.07 |
| Delta neutral (USD/share) | 3.25 |
| Gamma neutral (USD/share) | 4.07 |
| Gamma max (USD/share) | 5.15 |
| Open interest (contracts) | 673,442 |
| Nearest-expiration max pain (USD/share) | 4.50 (2026-10-23) |
| All-expiration max pain (USD/share) | 5.00 |
| Net gamma exposure | 16,424,095 |
| Call wall (USD/share) | 5.00 |
| Put wall (USD/share) | 5.00 |
| Put/call open-interest ratio | 0.17 |
| Options catalyst-intensity score (0–100) | 53.2 |
| Options directional score (-100 to +100) | 36.2 |
| IV rank | 100.0 |
| Front-minus-back IV | -2.7 pp |
| Front 25-delta risk reversal | -10.3 pp |
| Call OI change, 1 session | -103,528 contracts · -15.3% |
| Put OI change, 1 session | -23,261 contracts · -19.1% |
| Call minus put OI growth, 1 session | +3.8 pp |
| Call OI change, 5 sessions | -43,306 contracts · -7.0% |
| Put OI change, 5 sessions | -19,447 contracts · -16.4% |
| Call minus put OI growth, 5 sessions | +9.4 pp |
| Daily call OI change surprise | -2.54σ (252 prior changes) |
| Daily put OI change surprise | -1.35σ (252 prior changes) |
| Daily call-minus-put growth surprise | +0.77σ (252 prior changes) |
| Daily open interest change (contracts) | -126,789 |
| Daily open interest change z-score (prior 252) | -2.29σ (252 prior changes) |
| Gamma max distance from close | +26.6% |
| Delta neutral distance from close | -20.2% |
| Prior-year sessions closer to gamma max | 82.9% of 252 |
| Prior-year sessions closer to delta neutral | 37.7% of 252 |

## Historical gamma-max cross outcomes

| Direction | Horizon | n | Median | Middle 50% | Above zero | Nominal ≥90% median interval | Confidence floor |
| --- | --- | ---: | ---: | ---: | ---: | ---: | ---: |
| above | Day +1 | 23 | +0.5% | -1.6% to +4.8% | 52% | -1.2% to +3.4% | 0.0% |
| above | Day +3 | 23 | 0.0% | -4.6% to +7.5% | 48% | -2.1% to +7.1% | 0.0% |
| above | Day +5 | 23 | +1.6% | -4.6% to +8.9% | 61% | -0.7% to +5.0% | 0.0% |
| above | Day +10 | 23 | -2.9% | -9.5% to +6.3% | 39% | -4.2% to +4.5% | 0.0% |
| below | Day +1 | 24 | -1.1% | -3.1% to +0.9% | 38% | -3.1% to +0.5% | 0.0% |
| below | Day +3 | 24 | -1.0% | -5.0% to +5.3% | 50% | -4.1% to +3.9% | 0.0% |
| below | Day +5 | 24 | +3.3% | -4.9% to +11.4% | 67% | -3.3% to +9.3% | 0.0% |
| below | Day +10 | 24 | +2.0% | -6.8% to +10.7% | 63% | -5.1% to +10.0% | 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/ACHR.json)
- [Historical CSV](https://halfonadouble.com/api/v1/history/ACHR.csv)
- [Public aggregate analysis](https://halfonadouble.com/api/v1/analysis/ACHR.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).