OpEx pin holds, TSLA rips 5%, but negative GEX shadows Monday's open

GAMMA BRIEF AI Generated 2026-08-21

Friday's monthly OpEx session ended with SPY closing at 765.25, wedged tightly between the 765 put wall and 766 call wall — a textbook pin. The real fireworks were in TSLA, which surged 5.06% after a combined $419M in 0DTE call flow hit the tape in the first five minutes of trading, sweeping strikes from 350 to 360 before price ran to 366.49.

Beneath the calm surface, the structure is less reassuring. SPX net GEX sits at a deeply negative -$35.86B, all three major ETFs closed well above max pain, and VIX ended flat at 15.13 despite gold gaining 1.84% — an unusual divergence that suggests macro stress may be building outside the equity volatility complex. With the OpEx reset coming Monday, the gamma pin evaporates and the range expands.

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 BEARISH

Call Wall 7700

Put Wall 7650

Max Pain 7600

Net GEX $35.9B

SPY BEARISH

Call Wall 766

Put Wall 765

Max Pain 757

Net GEX $6.8B

QQQ BULLISH

Call Wall 714

Put Wall 713

Max Pain 705

Net GEX $0.5B

IWM CHOP

Call Wall 300

Put Wall 295

Max Pain 295

Net GEX +$0.3B

ⓘ 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

→SPX net GEX: -$35.86B — negative gamma regime; dealers amplify directional moves.

→SPY net GEX: -$6.80B | QQQ net GEX: -$0.50B | IWM net GEX: +$0.30B.

→SPY closed at 765.25 — 0.75 below call wall (766), 0.25 above put wall (765), 8.25 above max pain (757).

→TSLA 0DTE call flow: $128M block at 350 + $118M sweep at 355 + $91M sweep at 360 + $82M sweep at 352.5 — combined $419M in first 5 minutes; TSLA closed +5.06% at 362.58.

→SPX 0DTE put sweep at 7680 strike — $75M premium, vol/OI 85.7x, sentiment: bearish_bet, 09:01 ET.

→SPY 0DTE volume: 73.4% of total — extreme concentration in same-day expiration.

→VIX: 15.13 (+0.00%) | GLD: +1.84% — gold rising alongside equities on OpEx Friday; possible dollar-weakness or inflation narrative building.

→SPY trend bias: BEARISH (score -31, confidence 44%) — below VWAP 765.75, LH/LL price structure. QQQ trend bias: BULLISH (score +37, confidence 52%) — above VWAP 712.90, HH/HL structure. IWM: CHOP (score +5, confidence 7%).

→SYNTHESIS: QQQ shows bullish trend bias yet closed 0.17 below the 713 put wall with a 6.43-point intraday range and a session low 3.76 below the put wall — trend score and GEX wall position are in conflict, reducing conviction on the bullish read.

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

Key Themes

Monthly OpEx pin at SPY 765/766 and IWM 300TSLA 0DTE call avalanche — $419M in opening-minute flowPost-OpEx negative GEX reset — gamma amplification risk MondayGold/equity co-rally — dollar weakness or inflation narrative

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Directional Calls

SPY BEARISH

QQQ BEARISH

IWM RANGE-BOUND