BSX max pain, gamma exposure (GEX) & options open interest
As of close · rank #118 by open interest · 1,394 sessions of history since Dec 1, 2020
BSX's nearest-expiration max pain is 44.50 for 2026-10-09, its GEX flip is 42.77, net GEX is -1,253,387, its put/call open-interest ratio is 0.39. 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 -151.3 pp
BSX closed 38.8% below its gamma max of 59.11. It is 2.6% below the delta neutral price of 43.72. Total open interest is 852,234, -1.9% versus the previous session. Its options catalyst-intensity score is 48.4 out of 100, led by 25Δ risk reversal -151.3 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 | -9,783 contracts · -1.6% |
| Put OI change, 1 session | -6,831 contracts · -2.8% |
| Call minus put OI growth, 1 session | +1.2 pp |
| Call OI change, 5 sessions | +5,983 contracts · +1.0% |
| Put OI change, 5 sessions | +3,646 contracts · +1.5% |
| Call minus put OI growth, 5 sessions | -0.6 pp |
| Daily call OI change surprise | -0.40σ (252 prior changes) |
| Daily put OI change surprise | -0.79σ (252 prior changes) |
| Daily call-minus-put growth surprise | +0.07σ (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 above gamma max 39 completed Day +10 paths · latest Apr 23, 2026
| Horizon | n | Median | Middle 50% | Above zero | Nominal ≥90% median interval | Confidence floor |
|---|---|---|---|---|---|---|
| Day +1 | 39 | -0.1% | -0.5% to +0.6% | 44% | -0.4% to +0.3% | 0.0% |
| Day +2 | 39 | +0.2% | -1.2% to +0.8% | 56% | -0.4% to +0.6% | 0.0% |
| Day +3 | 39 | -0.1% | -1.2% to +0.7% | 46% | -0.7% to +0.4% | 0.0% |
| Day +4 | 39 | -0.3% | -1.3% to +1.1% | 44% | -1.0% to +0.7% | 0.0% |
| Day +5 | 39 | +0.2% | -1.3% to +1.2% | 54% | -0.9% to +1.1% | 0.0% |
| Day +6 | 39 | +0.2% | -2.3% to +1.4% | 54% | -1.2% to +1.1% | 0.0% |
| Day +7 | 39 | +0.4% | -1.5% to +1.4% | 59% | -0.9% to +1.0% | 0.0% |
| Day +8 | 39 | +0.1% | -1.5% to +1.9% | 51% | -0.9% to +1.1% | 0.0% |
| Day +9 | 39 | +0.5% | -1.6% to +2.3% | 54% | -0.6% to +1.6% | 0.0% |
| Day +10 | 39 | +0.4% | -1.1% to +1.9% | 54% | -0.8% to +1.5% | 0.0% |
Crosses below gamma max 38 completed Day +10 paths · latest Jul 3, 2025
| Horizon | n | Median | Middle 50% | Above zero | Nominal ≥90% median interval | Confidence floor |
|---|---|---|---|---|---|---|
| Day +1 | 38 | +0.1% | -0.5% to +0.5% | 53% | -0.3% to +0.3% | 0.0% |
| Day +2 | 38 | -0.2% | -1.0% to +0.9% | 39% | -0.6% to +0.2% | 0.0% |
| Day +3 | 38 | -0.0% | -1.0% to +1.5% | 47% | -0.5% to +1.4% | 0.0% |
| Day +4 | 38 | +0.3% | -0.7% to +1.6% | 53% | -0.3% to +1.2% | 0.0% |
| Day +5 | 38 | +0.6% | -1.0% to +1.9% | 55% | -0.7% to +1.4% | 0.0% |
| Day +6 | 38 | +0.7% | -0.9% to +1.3% | 63% | -0.2% to +1.2% | 0.0% |
| Day +7 | 38 | +0.3% | -1.0% to +2.0% | 53% | -0.5% to +1.6% | 0.0% |
| Day +8 | 38 | +0.6% | -1.3% to +2.4% | 61% | -0.3% to +1.4% | 0.0% |
| Day +9 | 38 | +1.0% | -1.0% to +2.5% | 68% | +0.1% to +1.6% | +0.1% |
| Day +10 | 38 | +1.2% | -1.4% to +2.7% | 58% | -0.6% to +2.3% | 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 | 0% |
| Gamma max crosses | 2 |
| Delta neutral crosses | 26 |
| Prior-year sessions closer to gamma max | 97.2% of 252 |
| Prior-year sessions closer to delta neutral | 46.0% of 252 |
| Open interest percentile (1y) | 79th |
| Daily open interest change versus prior year | -0.52σ (-16,614 contracts; 252 prior changes) |
| Open interest change, 5 sessions | +1.1% |
| Open interest change, 21 sessions | -15.8% |
| History available | Dec 1, 2020 → Oct 2, 2026 |
Recent crosses
- closed below delta neutral at 43.23 vs 43.80 (-1.3%)
- closed above delta neutral at 43.65 vs 43.25 (+0.9%)
- closed below delta neutral at 43.92 vs 44.18 (-0.6%)
- closed above delta neutral at 44.92 vs 44.36 (+1.3%)
- closed below delta neutral at 43.72 vs 44.42 (-1.6%)
- closed above delta neutral at 43.34 vs 43.06 (+0.6%)
- closed below delta neutral at 43.55 vs 44.79 (-2.8%)
- closed above delta neutral at 43.91 vs 43.77 (+0.3%)
- closed below delta neutral at 43.10 vs 45.54 (-5.7%)
- closed above delta neutral at 44.25 vs 44.07 (+0.4%)
In today's screens
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Neighbours by open interest
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Canonical source: https://halfonadouble.com/stock/BSX
Questions people ask about BSX
Where is BSX's gamma max today?
As of Oct 2, 2026, the gamma max for BSX is 59.11, +38.8% from the 42.60 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 BSX above or below its delta neutral price?
BSX closed below delta neutral: 42.60 against a delta neutral price of 43.72. The delta neutral price is where the summed delta of the whole chain is zero; the definition.
How much open interest does BSX have?
852,234 contracts of open interest across 520 listed contracts on Oct 2, 2026, -1.9% 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.