ASX max pain, gamma exposure (GEX) & options open interest
As of close · rank #563 by open interest · 1,233 sessions of history since Jul 22, 2021
ASX's nearest-expiration max pain is 40.00 for 2026-10-16, its GEX flip is 36.85, net GEX is 10,871,723, its put/call open-interest ratio is 0.53. 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: OI change 0.06σ · 14d expected move +11.1%
ASX closed 4.1% above its gamma max of 45.51. It is 19.8% above the delta neutral price of 38.06. That is a fresh cross: the previous close was on the other side of gamma max. Total open interest is 125,172, +0.8% versus the previous session. Its options catalyst-intensity score is 51.3 out of 100, led by OI change 0.06σ, 14d expected move +11.1%. 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 | +352 contracts · +0.4% |
| Put OI change, 1 session | +599 contracts · +1.4% |
| Call minus put OI growth, 1 session | -1.0 pp |
| Call OI change, 5 sessions | +2,810 contracts · +3.6% |
| Put OI change, 5 sessions | +3,996 contracts · +10.2% |
| Call minus put OI growth, 5 sessions | -6.6 pp |
| Daily call OI change surprise | +0.01σ (252 prior changes) |
| Daily put OI change surprise | +0.28σ (252 prior changes) |
| Daily call-minus-put growth surprise | -0.01σ (232 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 above gamma max 29 completed Day +10 paths · latest Oct 2, 2026 fresh cross
| Horizon | n | Median | Middle 50% | Above zero | Nominal ≥90% median interval | Confidence floor |
|---|---|---|---|---|---|---|
| Day +1 | 31 | -0.5% | -1.8% to +0.9% | 42% | -1.5% to +0.4% | 0.0% |
| Day +2 | 31 | -1.8% | -3.3% to +1.6% | 42% | -2.8% to +0.7% | 0.0% |
| Day +3 | 31 | -1.5% | -3.0% to +2.2% | 42% | -2.6% to +0.8% | 0.0% |
| Day +4 | 30 | -1.6% | -3.6% to +3.1% | 40% | -2.7% to +1.9% | 0.0% |
| Day +5 | 30 | -0.0% | -3.8% to +2.8% | 50% | -3.0% to +1.6% | 0.0% |
| Day +6 | 30 | +0.5% | -3.9% to +3.7% | 53% | -2.6% to +2.5% | 0.0% |
| Day +7 | 30 | -0.8% | -3.5% to +4.8% | 40% | -1.8% to +1.3% | 0.0% |
| Day +8 | 30 | 0.0% | -3.1% to +6.1% | 47% | -2.0% to +4.4% | 0.0% |
| Day +9 | 29 | -0.3% | -3.2% to +9.4% | 48% | -2.7% to +3.2% | 0.0% |
| Day +10 | 29 | -0.1% | -2.5% to +10.5% | 48% | -1.8% to +6.8% | 0.0% |
Crosses below gamma max 27 completed Day +10 paths · latest Sep 30, 2026
| Horizon | n | Median | Middle 50% | Above zero | Nominal ≥90% median interval | Confidence floor |
|---|---|---|---|---|---|---|
| Day +1 | 29 | -1.0% | -2.5% to +0.6% | 34% | -1.9% to +0.1% | 0.0% |
| Day +2 | 29 | +0.3% | -3.3% to +2.8% | 52% | -3.1% to +1.5% | 0.0% |
| Day +3 | 28 | -1.5% | -3.7% to +2.5% | 36% | -2.5% to +1.1% | 0.0% |
| Day +4 | 28 | -1.6% | -6.0% to +3.8% | 43% | -4.8% to +2.1% | 0.0% |
| Day +5 | 28 | +0.7% | -3.9% to +2.7% | 57% | -3.1% to +2.3% | 0.0% |
| Day +6 | 28 | -0.0% | -2.7% to +3.9% | 50% | -1.4% to +1.9% | 0.0% |
| Day +7 | 28 | -0.2% | -5.4% to +4.8% | 43% | -3.4% to +3.3% | 0.0% |
| Day +8 | 27 | +0.3% | -5.3% to +2.9% | 52% | -1.3% to +1.9% | 0.0% |
| Day +9 | 27 | -0.3% | -4.5% to +4.3% | 48% | -2.1% to +2.7% | 0.0% |
| Day +10 | 27 | +0.1% | -3.1% to +5.1% | 52% | -2.2% to +2.0% | 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 | 42% |
| Gamma max crosses | 37 |
| Delta neutral crosses | 0 |
| Prior-year sessions closer to gamma max | 36.0% of 250 |
| Prior-year sessions closer to delta neutral | 23.2% of 250 |
| Open interest percentile (1y) | 88th |
| Daily open interest change versus prior year | +0.06σ (951 contracts; 252 prior changes) |
| Open interest change, 5 sessions | +5.7% |
| Open interest change, 21 sessions | -5.8% |
| History available | Jul 22, 2021 → Oct 2, 2026 |
Recent crosses
- closed above gamma max at 47.45 vs 45.51 (+4.1%)
- closed below gamma max at 44.46 vs 45.84 (-3.1%)
- closed above gamma max at 45.31 vs 45.20 (+0.2%)
- closed below gamma max at 43.93 vs 45.31 (-3.1%)
- closed above gamma max at 45.20 vs 45.11 (+0.2%)
- closed below gamma max at 39.86 vs 40.05 (-0.5%)
- closed above gamma max at 41.20 vs 40.67 (+1.3%)
- closed below gamma max at 42.99 vs 43.57 (-1.3%)
- closed above gamma max at 45.12 vs 44.24 (+1.9%)
- closed below gamma max at 39.77 vs 42.06 (-5.8%)
In today's screens
Neighbours by open interest
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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/ASX
Questions people ask about ASX
Where is ASX's gamma max today?
As of Oct 2, 2026, the gamma max for ASX is 45.51, -4.1% from the 47.45 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 ASX above or below its delta neutral price?
ASX closed above delta neutral: 47.45 against a delta neutral price of 38.06. The delta neutral price is where the summed delta of the whole chain is zero; the definition.
How much open interest does ASX have?
125,172 contracts of open interest across 173 listed contracts on Oct 2, 2026, +0.8% 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.