# BIRK: options-positioning snapshot

Canonical: https://halfonadouble.com/stock/BIRK
Data through: 2026-10-02 close
Publisher: Half on a Double

| Published field | Value |
| --- | --- |
| Close (USD/share) | 33.33 |
| Delta neutral (USD/share) | 33.42 |
| Gamma neutral (USD/share) | 33.33 |
| Gamma max (USD/share) | 35.71 |
| Open interest (contracts) | 106,837 |
| Nearest-expiration max pain (USD/share) | 35.00 (2026-10-16) |
| All-expiration max pain (USD/share) | 35.00 |
| Net gamma exposure | 2,115,139 |
| Call wall (USD/share) | 35.00 |
| Put wall (USD/share) | 27.50 |
| Put/call open-interest ratio | 1.26 |
| Options catalyst-intensity score (0–100) | 60.2 |
| Options directional score (-100 to +100) | 6.6 |
| IV rank | 32.4 |
| Front ATM IV | +44.7% |
| Front-minus-back IV | -3.0 pp |
| Front expected move | +8.8% |
| Front ATM straddle / spot | +7.0% |
| Front 25-delta risk reversal | -235.1 pp |
| Call OI change, 1 session | +7,160 contracts · +17.8% |
| Put OI change, 1 session | +70 contracts · +0.1% |
| Call minus put OI growth, 1 session | +17.7 pp |
| Call OI change, 5 sessions | +15,629 contracts · +49.3% |
| Put OI change, 5 sessions | +174 contracts · +0.3% |
| Call minus put OI growth, 5 sessions | +49.0 pp |
| Daily call OI change surprise | +3.01σ (252 prior changes) |
| Daily put OI change surprise | -0.01σ (252 prior changes) |
| Daily call-minus-put growth surprise | +1.29σ (252 prior changes) |
| Daily open interest change (contracts) | 7,230 |
| Daily open interest change z-score (prior 252) | +1.12σ (252 prior changes) |
| Gamma max distance from close | +7.1% |
| Delta neutral distance from close | +0.3% |
| Prior-year sessions closer to gamma max | 15.9% of 252 |
| Prior-year sessions closer to delta neutral | 2.4% of 252 |

## Historical gamma-max cross outcomes

| Direction | Horizon | n | Median | Middle 50% | Above zero | Nominal ≥90% median interval | Confidence floor |
| --- | --- | ---: | ---: | ---: | ---: | ---: | ---: |
| above | Day +1 | 10 | -1.3% | -3.1% to +0.6% | 40% | -3.6% to +0.9% | 0.0% |
| above | Day +3 | 10 | -1.0% | -3.9% to +0.9% | 40% | -7.3% to +1.2% | 0.0% |
| above | Day +5 | 10 | -0.0% | -4.1% to +1.9% | 50% | -5.1% to +3.1% | 0.0% |
| above | Day +10 | 10 | -2.1% | -4.4% to +0.9% | 30% | -6.3% to +5.9% | 0.0% |
| below | Day +1 | 10 | +0.4% | +0.1% to +1.1% | 80% | -1.4% to +3.5% | 0.0% |
| below | Day +3 | 10 | -2.0% | -3.4% to +1.9% | 40% | -4.1% to +2.9% | 0.0% |
| below | Day +5 | 10 | -1.3% | -4.7% to +5.0% | 40% | -4.9% to +8.0% | 0.0% |
| below | Day +10 | 10 | -2.0% | -6.8% to +0.9% | 30% | -10.0% to +6.4% | 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/BIRK.json)
- [Historical CSV](https://halfonadouble.com/api/v1/history/BIRK.csv)
- [Complete advanced analysis](https://halfonadouble.com/api/v1/analysis/BIRK.json?date=2026-10-02)

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).