PACB max pain, gamma exposure (GEX) & options open interest
As of close · rank #517 by open interest · 1,375 sessions of history since Dec 1, 2020
PACB's nearest-expiration max pain is 1.50 for 2026-10-16, its GEX flip is 0.55, net GEX is 2,996,804, its put/call open-interest ratio is 0.07. 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 1.68σ · volume/OI 0.07
PACB closed 5.5% below its gamma max of 2.68. It is 51.7% above the delta neutral price of 1.23. Total open interest is 138,660, +8.6% versus the previous session. Its options catalyst-intensity score is 45.3 out of 100, led by OI change 1.68σ, volume/OI 0.07. 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 | +10,874 contracts · +9.2% |
| Put OI change, 1 session | +50 contracts · +0.5% |
| Call minus put OI growth, 1 session | +8.6 pp |
| Call OI change, 5 sessions | +76,060 contracts · +142.7% |
| Put OI change, 5 sessions | +2,825 contracts · +43.5% |
| Call minus put OI growth, 5 sessions | +99.2 pp |
| Daily call OI change surprise | +1.80σ (252 prior changes) |
| Daily put OI change surprise | +0.09σ (252 prior changes) |
| Daily call-minus-put growth surprise | +1.44σ (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 50 completed Day +10 paths · latest Sep 11, 2026
| Horizon | n | Median | Middle 50% | Above zero | Nominal ≥90% median interval | Confidence floor |
|---|---|---|---|---|---|---|
| Day +1 | 50 | +1.6% | -2.9% to +3.8% | 58% | -1.4% to +2.7% | 0.0% |
| Day +2 | 50 | +0.7% | -4.3% to +5.3% | 52% | -3.1% to +3.1% | 0.0% |
| Day +3 | 50 | -1.3% | -6.3% to +4.1% | 42% | -5.3% to +1.4% | 0.0% |
| Day +4 | 50 | -1.8% | -7.2% to +6.3% | 42% | -4.7% to +1.1% | 0.0% |
| Day +5 | 50 | -0.1% | -5.2% to +5.8% | 48% | -2.9% to +2.8% | 0.0% |
| Day +6 | 50 | -0.2% | -8.2% to +5.8% | 46% | -5.4% to +3.8% | 0.0% |
| Day +7 | 50 | -0.4% | -9.0% to +10.9% | 44% | -3.2% to +2.0% | 0.0% |
| Day +8 | 50 | -1.1% | -11.8% to +12.7% | 50% | -6.9% to +6.8% | 0.0% |
| Day +9 | 50 | -2.8% | -11.1% to +14.4% | 46% | -7.6% to +7.2% | 0.0% |
| Day +10 | 50 | +1.4% | -11.6% to +16.4% | 50% | -7.6% to +6.9% | 0.0% |
Crosses above gamma max 41 completed Day +10 paths · latest Sep 10, 2026
| Horizon | n | Median | Middle 50% | Above zero | Nominal ≥90% median interval | Confidence floor |
|---|---|---|---|---|---|---|
| Day +1 | 41 | +1.4% | -1.8% to +4.0% | 59% | -1.0% to +3.1% | 0.0% |
| Day +2 | 41 | +1.6% | -2.4% to +5.8% | 61% | -1.3% to +4.2% | 0.0% |
| Day +3 | 41 | +1.0% | -4.9% to +6.2% | 56% | -1.4% to +5.2% | 0.0% |
| Day +4 | 41 | -0.7% | -4.2% to +7.5% | 49% | -3.0% to +4.4% | 0.0% |
| Day +5 | 41 | +1.7% | -5.0% to +12.9% | 59% | -3.0% to +4.3% | 0.0% |
| Day +6 | 41 | 0.0% | -6.3% to +8.7% | 49% | -3.6% to +5.3% | 0.0% |
| Day +7 | 41 | -0.5% | -8.4% to +8.8% | 49% | -5.6% to +6.7% | 0.0% |
| Day +8 | 41 | -2.7% | -10.1% to +16.9% | 46% | -6.4% to +10.3% | 0.0% |
| Day +9 | 41 | +3.4% | -10.5% to +18.1% | 51% | -6.8% to +13.2% | 0.0% |
| Day +10 | 41 | -1.3% | -10.8% to +17.4% | 46% | -6.7% to +13.3% | 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 | 67% |
| Gamma max crosses | 52 |
| Delta neutral crosses | 0 |
| Prior-year sessions closer to gamma max | 27.8% of 252 |
| Prior-year sessions closer to delta neutral | 7.1% of 252 |
| Open interest percentile (1y) | 100th |
| Daily open interest change versus prior year | +1.68σ (10,924 contracts; 252 prior changes) |
| Open interest change, 5 sessions | +132.0% |
| Open interest change, 21 sessions | +95.9% |
| History available | Dec 1, 2020 → Oct 2, 2026 |
Recent crosses
- closed below gamma max at 2.51 vs 2.68 (-6.8%)
- closed above gamma max at 1.37 vs 1.02 (+25.5%)
- closed below gamma max at 1.30 vs 1.42 (-9.5%)
- closed above gamma max at 1.27 vs 1.19 (+6.4%)
- closed below gamma max at 1.30 vs 1.42 (-9.2%)
- closed above gamma max at 1.28 vs 1.24 (+2.8%)
- closed below gamma max at 1.36 vs 1.39 (-2.8%)
- closed above gamma max at 1.52 vs 1.24 (+18.4%)
- closed below gamma max at 1.28 vs 1.33 (-4.0%)
- closed above gamma max at 1.23 vs 1.07 (+13.1%)
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/PACB
Questions people ask about PACB
Where is PACB's gamma max today?
As of Oct 2, 2026, the gamma max for PACB is 2.68, +5.5% from the 2.54 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 PACB above or below its delta neutral price?
PACB closed above delta neutral: 2.54 against a delta neutral price of 1.23. The delta neutral price is where the summed delta of the whole chain is zero; the definition.
How much open interest does PACB have?
138,660 contracts of open interest across 49 listed contracts on Oct 2, 2026, +8.6% 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.