COST max pain, gamma exposure (GEX) & options open interest
As of close · rank #328 by open interest · 1,409 sessions of history since Dec 1, 2020
COST's nearest-expiration max pain is 957.50 for 2026-10-30, its GEX flip is 961.99, net GEX is 14,230,123, its put/call open-interest ratio is 1.03. These are whole-chain derived aggregates as of Oct 23, 2026 close.
COST max pain and GEX snapshot
End-of-day snapshot for . Nearest-expiration max pain uses the expiry shown on its card; GEX uses the whole chain. Missing values are unavailable, not zero.
Prices are in US dollars per share. Net GEX is modeled dollar-delta change per $1 underlying move. Max pain minimizes aggregate intrinsic payout for that expiration; it is not a closing-price forecast. Signed GEX uses calls positive and puts negative, a model convention rather than observed dealer inventory. The flip is a confirmed zero crossing; walls locate side-specific concentrations, not guaranteed support or resistance.
Learn how to read the max pain payout example, GEX chart, gamma flip and walls, and open interest versus trading volume.
Advanced options analysis
Public aggregate 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: IV rank 100 · volume/OI 0.12 · smile convexity 10.7 pp
COST closed 4.1% below its gamma max of 1,044.02. It is 6.4% above the delta neutral price of 939.52. Total open interest is 270,336, -10.0% versus the previous session. Its options catalyst-intensity score is 58.8 out of 100, led by IV rank 100, volume/OI 0.12, smile convexity 10.7 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 | -16,185 contracts · -10.8% |
| Put OI change, 1 session | -14,008 contracts · -9.3% |
| Call minus put OI growth, 1 session | -1.6 pp |
| Call OI change, 5 sessions | +2,748 contracts · +2.1% |
| Put OI change, 5 sessions | +7,402 contracts · +5.7% |
| Call minus put OI growth, 5 sessions | -3.6 pp |
| Daily call OI change surprise | -1.47σ (252 prior changes) |
| Daily put OI change surprise | -1.19σ (252 prior changes) |
| Daily call-minus-put growth surprise | -0.57σ (252 prior changes) |
History
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Analysis visualizations
Daily ticker aggregates through 2026-10-23. The max pain curve pools all listed expirations; individual contracts are outside the public dataset.
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Aggregate IV history
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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 9 completed Day +10 paths · latest Dec 19, 2023
| Horizon | n | Median | Middle 50% | Above zero | Nominal ≥90% median interval | Confidence floor |
|---|---|---|---|---|---|---|
| Day +1 | 9 | -0.7% | -2.1% to -0.2% | 22% | -2.5% to +0.2% | 0.0% |
| Day +2 | 9 | +0.3% | -1.6% to +0.7% | 56% | -1.9% to +0.8% | 0.0% |
| Day +3 | 9 | -0.8% | -1.5% to +1.0% | 44% | -1.5% to +1.1% | 0.0% |
| Day +4 | 9 | -0.2% | -1.2% to +0.6% | 44% | -1.6% to +1.3% | 0.0% |
| Day +5 | 9 | +0.7% | -1.6% to +1.5% | 67% | -1.6% to +1.9% | 0.0% |
| Day +6 | 9 | -0.1% | -1.0% to +2.0% | 44% | -2.1% to +2.0% | 0.0% |
| Day +7 | 9 | +0.6% | -0.4% to +2.7% | 56% | -1.4% to +2.9% | 0.0% |
| Day +8 | 9 | -0.3% | -1.2% to +2.4% | 44% | -1.4% to +2.6% | 0.0% |
| Day +9 | 9 | +1.1% | -0.2% to +3.3% | 67% | -4.7% to +3.8% | 0.0% |
| Day +10 | 9 | +1.3% | -0.9% to +4.0% | 67% | -4.3% to +4.4% | 0.0% |
Crosses above gamma max 9 completed Day +10 paths · latest Dec 18, 2023
| Horizon | n | Median | Middle 50% | Above zero | Nominal ≥90% median interval | Confidence floor |
|---|---|---|---|---|---|---|
| Day +1 | 9 | -0.3% | -0.5% to +0.5% | 44% | -0.8% to +0.6% | 0.0% |
| Day +2 | 9 | -0.6% | -2.4% to +0.2% | 33% | -3.0% to +1.9% | 0.0% |
| Day +3 | 9 | -0.0% | -1.3% to +0.8% | 44% | -2.4% to +1.2% | 0.0% |
| Day +4 | 9 | -1.1% | -2.0% to +0.6% | 44% | -2.8% to +1.4% | 0.0% |
| Day +5 | 9 | -0.7% | -1.0% to +0.7% | 44% | -2.0% to +1.3% | 0.0% |
| Day +6 | 9 | +0.4% | -1.8% to +1.2% | 67% | -2.1% to +1.8% | 0.0% |
| Day +7 | 9 | +0.3% | -2.3% to +1.4% | 56% | -2.4% to +2.2% | 0.0% |
| Day +8 | 9 | +0.4% | -0.7% to +2.2% | 67% | -1.6% to +2.3% | 0.0% |
| Day +9 | 9 | +0.2% | -1.5% to +2.1% | 56% | -2.7% to +2.9% | 0.0% |
| Day +10 | 9 | +1.3% | +0.2% to +2.6% | 78% | -5.4% to +2.7% | 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 | 0% |
| Gamma max crosses | 0 |
| Delta neutral crosses | 30 |
| Prior-year sessions closer to gamma max | 23.4% of 252 |
| Prior-year sessions closer to delta neutral | 94.0% of 252 |
| Open interest percentile (1y) | 42th |
| Daily open interest change versus prior year | -1.35σ (-30,193 contracts; 252 prior changes) |
| Open interest change, 5 sessions | +3.9% |
| Open interest change, 21 sessions | -7.9% |
| History available | Dec 1, 2020 → Oct 23, 2026 |
Recent crosses
- closed above delta neutral at 922.77 vs 910.35 (+1.3%)
- closed below delta neutral at 928.48 vs 935.89 (-0.8%)
- closed above delta neutral at 945.47 vs 937.32 (+0.9%)
- closed below delta neutral at 934.66 vs 937.80 (-0.3%)
- closed above delta neutral at 947.74 vs 935.71 (+1.3%)
- closed below delta neutral at 933.51 vs 940.14 (-0.7%)
- closed above delta neutral at 935.03 vs 928.57 (+0.7%)
- closed below delta neutral at 929.22 vs 930.79 (-0.2%)
- closed above delta neutral at 945.57 vs 934.13 (+1.2%)
- closed below delta neutral at 912.97 vs 938.86 (-2.8%)
In today's screens
Neighbours by open interest
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Canonical source: https://halfonadouble.com/stock/COST
Questions people ask about COST
What is COST's max pain for the nearest expiration?
As of Oct 23, 2026 close, nearest-expiration max pain is 957.50 for the 2026-10-30 expiration. It is a payout-minimizing strike for one expiration. An all-expiration pooled value is a different comparison, and neither establishes where the underlying will close. Max pain definition and worked payout example.
Our 2025 max-pain study compares historical Thursday levels with Friday underlying closes and an unchanged-price baseline. Its scope and results are separate from this current ticker snapshot.
What do COST's gamma exposure and gamma flip show?
Signed net GEX is 14,230,123 as of Oct 23, 2026 close. The confirmed GEX flip is 961.99. These aggregate model outputs use calls positive and puts negative. Their sign does not identify dealers' actual positions or predict the next move. How to interpret GEX, gamma flip and walls.
Where is COST's gamma max today?
As of Oct 23, 2026, the gamma max for COST is 1,044.02, +4.1% from the 1,003.32 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 COST above or below its delta neutral price?
COST closed above delta neutral: 1,003.32 against a delta neutral price of 939.52. The delta neutral price is where the summed delta of the whole chain is zero; the definition.
How much open interest does COST have?
270,336 contracts of open interest across 2,182 listed contracts on Oct 23, 2026, -10.0% 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.