September opens ugly: broad selloff, $607M 0DTE put sweep, put walls tested

GAMMA BRIEF AI Generated 2026-09-01

September arrived with a punch — SPY dropped -0.67%, QQQ shed -1.24%, and IWM fell -1.12% as a coordinated $607M+ cluster of 0DTE SPX put sweeps at the open set the tone for the entire session. The tape never recovered, with small-caps briefly breaching the 290 put wall intraday and closing just a hair above it.

Beneath the surface, gold and silver got hammered (-2.84% and -3.71% respectively) while AAPL bucked the tape with a +2.51% surge — the single bright spot in an otherwise risk-off session. With negative gamma dominant across all three major ETFs and breadth collapsing to a 0.43 A/D ratio, the path of least resistance into Wednesday looks fragile.

Dealer positioning shows a clear regime shift as options market makers adjust hedges across the curve. The put-call skew has compressed significantly, suggesting institutional players are reducing downside protection.

Watch the key level closely at open — it sits exactly at the intersection of the GEX zero line and overnight VWAP. A clean break above opens the path to the call wall; rejection sends us back toward the put wall.

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GEX Walls — Options Positioning

SPX CHOP

Call Wall 7650

Put Wall 7625

Max Pain 7650

Net GEX $158.8B

SPY CHOP

Call Wall 770

Put Wall 760

Max Pain 761

Net GEX $11.4B

QQQ BULLISH

Call Wall 715

Put Wall 700

Max Pain 710

Net GEX $6.5B

IWM BEARISH

Call Wall 300

Put Wall 290

Max Pain 295

Net GEX $4.7B

ⓘ Trend Bias vs Directional Call

The badge shows momentum bias — where price sits relative to VWAP and moving averages right now. The brief's directional call weighs GEX structure, options flow, and macro signals, and may point the opposite direction when a rally runs into a call wall or flow turns bearish.

GEX walls are a snapshot from brief generation — not a live feed.

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GEX walls are price levels where dealers hedge aggressively. Price tends to gravitate toward Max Pain and stall near walls.

Stock GEX — Extended

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Unusual Options Activity

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Facts — Draw Your Own Conclusions

→SPY net GEX: -$11.43B — negative gamma regime; call wall 770, put wall 760, max pain 761.

→QQQ net GEX: -$6.51B — negative gamma regime; call wall 715, put wall 700, max pain 710.

→IWM net GEX: -$4.74B — negative gamma regime; call wall 300, put wall 290, max pain 295.

→Five coordinated 0DTE SPX put sweeps at 09:01 ET: $168M (7650), $120M (7655), $111M (7660), $107M (7645), $101M (7640) — total $607M, vol/OI ranging 21.2x–64.8x, all classified bearish_bet.

→NYSE A/D ratio: 0.43 (828 advancers / 1,931 decliners), net -1,103 — tape quality: narrow.

→IWM session low 289.97 briefly breached the 290 put wall; IWM closed at 290.65, -1.12%.

→GLD -2.84%, SLV -3.71%; AAPL +2.51% — significant cross-asset dispersion within a risk-off tape.

→VIX closed at 16.34 (+0.31%); VVIX at 91.25 — volatility regime remains NORMAL despite the selloff, limiting panic-driven tail risk interpretation.

Objective data only. No interpretation. Form your own view.

Key Themes

$607M 0DTE put sweep cluster at the openNegative gamma across SPY/QQQ/IWM amplifying September selloffAAPL +2.51% vs broad market -1%+ divergenceGLD/SLV risk-off liquidation alongside equity weakness

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Directional Calls

SPY BEARISH

QQQ NEUTRAL

IWM BEARISH