ACHR max pain, gamma exposure (GEX) & options open interest
As of close · rank #146 by open interest · 1,137 sessions of history since Sep 17, 2021
ACHR's nearest-expiration max pain is 5.00 for 2026-10-09, its GEX flip is 0.52, net GEX is 17,495,624, its put/call open-interest ratio is 0.19. These are whole-chain derived aggregates as of Oct 2, 2026 close.
Whole-chain analytics
Derived after the close from the same dated options chain. Signed gamma exposure uses calls positive and puts negative; it is a model convention, not observed dealer inventory.
Advanced options analysis
Complete derived analysis from the dated chain, normalized where possible for comparison across tickers. Catalyst intensity measures unusual pricing and activity; it does not identify an event, predict direction, or establish that an investment is attractive.
Strongest relative signals: 25Δ risk reversal -211.2 pp
ACHR closed 25.0% below its gamma max of 6.11. It is 18.5% above the delta neutral price of 3.99. Total open interest is 704,172, -3.7% versus the previous session. Its options catalyst-intensity score is 47.7 out of 100, led by 25Δ risk reversal -211.2 pp. What gamma max means · What delta neutral means
Call versus put open interest changes
Growth compares outstanding contracts on each side. A positive growth gap favors calls; a negative gap favors puts. Standardized surprises compare each measure with its own prior history. These describe the OI balance, not IV skew or buying direction.
| Measure | Value |
|---|---|
| Call OI change, 1 session | -18,756 contracts · -3.1% |
| Put OI change, 1 session | -8,259 contracts · -6.9% |
| Call minus put OI growth, 1 session | +3.8 pp |
| Call OI change, 5 sessions | -5,353 contracts · -0.9% |
| Put OI change, 5 sessions | +631 contracts · +0.6% |
| Call minus put OI growth, 5 sessions | -1.5 pp |
| Daily call OI change surprise | -0.44σ (252 prior changes) |
| Daily put OI change surprise | -0.42σ (252 prior changes) |
| Daily call-minus-put growth surprise | +0.74σ (252 prior changes) |
History
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Analysis visualizations
Derived from the 2026-10-02 options chain. Select an analysis to explore its chart.
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Gamma walls
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What followed prior gamma-max crosses?
Each historical path starts at 0% on the cross date and follows the close for ten subsequent trading sessions. Cohorts use the same direction as labelled and require gamma max to be within 10% of the close on both crossing sessions.
Crosses below gamma max 24 completed Day +10 paths · latest Aug 12, 2026
| Horizon | n | Median | Middle 50% | Above zero | Nominal ≥90% median interval | Confidence floor |
|---|---|---|---|---|---|---|
| Day +1 | 24 | -1.1% | -3.1% to +0.9% | 38% | -3.1% to +0.5% | 0.0% |
| Day +2 | 24 | -1.7% | -5.7% to +5.4% | 46% | -5.4% to +2.0% | 0.0% |
| Day +3 | 24 | -1.0% | -5.0% to +5.3% | 50% | -4.1% to +3.9% | 0.0% |
| Day +4 | 24 | +2.1% | -5.4% to +7.4% | 58% | -3.6% to +7.2% | 0.0% |
| Day +5 | 24 | +3.3% | -4.9% to +11.4% | 67% | -3.3% to +9.3% | 0.0% |
| Day +6 | 24 | +2.3% | -9.2% to +11.8% | 58% | -4.5% to +6.4% | 0.0% |
| Day +7 | 24 | +0.9% | -7.7% to +9.0% | 58% | -4.9% to +6.3% | 0.0% |
| Day +8 | 24 | +1.2% | -10.4% to +8.0% | 58% | -7.7% to +6.1% | 0.0% |
| Day +9 | 24 | +2.4% | -6.8% to +7.8% | 58% | -5.2% to +7.0% | 0.0% |
| Day +10 | 24 | +2.0% | -6.8% to +10.7% | 63% | -5.1% to +10.0% | 0.0% |
Crosses above gamma max 23 completed Day +10 paths · latest Aug 10, 2026
| Horizon | n | Median | Middle 50% | Above zero | Nominal ≥90% median interval | Confidence floor |
|---|---|---|---|---|---|---|
| Day +1 | 23 | +0.5% | -1.6% to +4.8% | 52% | -1.2% to +3.4% | 0.0% |
| Day +2 | 23 | -0.9% | -3.8% to +2.0% | 39% | -3.5% to +0.4% | 0.0% |
| Day +3 | 23 | 0.0% | -4.6% to +7.5% | 48% | -2.1% to +7.1% | 0.0% |
| Day +4 | 23 | +4.1% | -6.2% to +9.2% | 65% | -3.8% to +7.5% | 0.0% |
| Day +5 | 23 | +1.6% | -4.6% to +8.9% | 61% | -0.7% to +5.0% | 0.0% |
| Day +6 | 23 | +4.3% | -3.2% to +11.6% | 61% | -1.4% to +7.1% | 0.0% |
| Day +7 | 23 | +1.8% | -5.4% to +10.7% | 57% | -4.5% to +8.1% | 0.0% |
| Day +8 | 23 | +0.2% | -8.9% to +8.5% | 52% | -5.1% to +4.2% | 0.0% |
| Day +9 | 23 | +0.6% | -9.2% to +5.9% | 52% | -3.0% to +2.8% | 0.0% |
| Day +10 | 23 | -2.9% | -9.5% to +6.3% | 39% | -4.2% to +4.5% | 0.0% |
Returns are close-to-close after the labelled number of subsequent trading sessions. The confidence floor is the closest-to-zero bound of the order-statistic median interval; it is zero when that interval spans zero. Its coverage is nominally at least 90% under independent observations. Historical paths can overlap, so the interval and floor are descriptive uncertainty guides rather than formal coverage guarantees. Historical, not a forecast.
Last 252 sessions
| Sessions closed above gamma max | 2% |
| Gamma max crosses | 6 |
| Delta neutral crosses | 0 |
| Prior-year sessions closer to gamma max | 80.6% of 252 |
| Prior-year sessions closer to delta neutral | 25.8% of 252 |
| Open interest percentile (1y) | 16th |
| Daily open interest change versus prior year | -0.45σ (-27,015 contracts; 252 prior changes) |
| Open interest change, 5 sessions | -0.7% |
| Open interest change, 21 sessions | -5.1% |
| History available | Sep 17, 2021 → Oct 2, 2026 |
Recent crosses
- closed below gamma max at 6.29 vs 6.87 (-9.2%)
- closed above gamma max at 6.26 vs 6.11 (+2.5%)
- closed below gamma max at 8.60 vs 9.14 (-6.3%)
- closed above gamma max at 8.95 vs 8.54 (+4.6%)
- closed below gamma max at 12.48 vs 13.61 (-9.1%)
- closed above gamma max at 11.57 vs 11.53 (+0.3%)
- closed below gamma max at 11.85 vs 12.15 (-2.5%)
- closed above gamma max at 12.09 vs 11.76 (+2.7%)
- closed below gamma max at 11.39 vs 14.00 (-22.9%)
- closed above gamma max at 11.16 vs 10.29 (+7.8%)
In today's screens
Neighbours by open interest
Cite or embed this snapshot
Share the dated 1600×840 image or cite this canonical page. The card contains public derived aggregates, not contract-level quotes.
Canonical source: https://halfonadouble.com/stock/ACHR
Questions people ask about ACHR
Where is ACHR's gamma max today?
As of Oct 2, 2026, the gamma max for ACHR is 6.11, +25.0% from the 4.89 close. Gamma max is the underlying price at which the summed gamma of every open contract is largest; how it is computed and why it matters.
Is ACHR above or below its delta neutral price?
ACHR closed above delta neutral: 4.89 against a delta neutral price of 3.99. The delta neutral price is where the summed delta of the whole chain is zero; the definition.
How much open interest does ACHR have?
704,172 contracts of open interest across 221 listed contracts on Oct 2, 2026, -3.7% versus the previous session. What open interest measures.
Levels are recomputed after every trading day from licensed end-of-day options data; only derived aggregates are published. Methodology · Data and licence · Not investment advice.