Markets closed. Last session: Fri, Sep 11.
SPX morning levels
Negative Gamma: High Vol, TrendingNet GEX -$46.87B
Net dealer gamma is negative, so hedging the book buys into strength and sells into weakness.
- SPX spot
- 7,591.7
- Call wall
- unchanged7,800
- Put wall
- unchanged7,500
- Zero-gamma flip
- -24 from 7,641.67,617.6
- Vol trigger
- 7,668.4
- Net GEX
- -$19.70B from -$27.18B-$46.87B
Comparisons run from the 2026-09-09 settlement to 2026-09-10 settlement. Open interest settles once a day, so that is the whole change.
SINCE YESTERDAY
- Zero-gamma flip 7,617.6, -24 from 7,641.6.
- Largest overnight open interest change: 7,700 put, expiry 2026-09-30, -13,320 contracts, 2026-09-09 to 2026-09-10 settlement.
- Net GEX -$46.87B, -$19.70B from -$27.18B.
Nothing else changed overnight.
2026-09-09 settlement to 2026-09-10 settlement
Top overnight open interest moves
Cboe settlement 2026-09-09 to 2026-09-10
| Strike | Expiry | Type | Change |
|---|---|---|---|
| 7,700 | 2026-09-30 | put | -13,320 |
| 8,050 | 2026-10-30 | call | +10,952 |
| 8,000 | 2026-10-30 | call | +8,517 |
Open interest change between two daily settlements. Not volume, not order flow, not advice. Every strike that moved.
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Call wall, put wall, zero-gamma flip and net GEX for the day ahead, computed from the overnight Cboe settlement. The first send has not gone out yet; join and it starts with the next one. Spike alerts are a separate list and are not sending either. No spam, unsubscribe anytime.
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Every figure on this page is dated. The levels are computed from daily Cboe settlement open interest and carry the settlement they were struck on. The comparisons are the difference between two dated settlements, not a running feed. Dealer positioning is an assumption, not an observable: open interest shows that a contract exists, never which side a dealer holds. Machine-readable version.