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AI selloff flips dealers short gamma, VIX +14%
SPX closed 51 points under its gamma flip, the VIX futures front end inverted, and skew jumped. Here are the levels for Friday.
- AI and chip stocks sank (Nasdaq −2.6%, Nvidia −4.4%, Lam −11.8%), but two out of three S&P 500 stocks rose. SPX fell 1.2% to 7,663.
- Dealers flipped from +$41.9B to −$36.4B of gamma. SPX closed 51 points under its 7,714 gamma flip, right on top of the biggest put strike at 7,650.
- VIX jumped 2.35 to 19.03, VVIX hit 107.9, and November VIX futures now trade above December. 30-day skew steepened from 10.1 to 12.4 points.
Scoreboard
| Close | Chg | Prev | |
|---|---|---|---|
| SPX | 7,663 | −1.21% | 7,757 |
| NDX | 28,959 | −2.90% | 29,823 |
| RUT | 2,784 | +0.11% | 2,781 |
| VIX | 19.03 | +2.35 | 16.68 |
| VIX1D | 15.18 | +3.80 | 11.38 |
| VVIX | 107.9 | +13.4 | 94.6 |
| VX Nov / Dec | 19.38 / 19.23 | −0.77% M1→M2 | +1.7% |
| VIX / VIX3M | 0.946 | +0.055 | 0.891 |
| SPX net GEX | −$36.4B | negative gamma | +$41.9B |
| Flip / Call wall / Put wall | 7,714 / 8,000 / 7,000 | 7,715 / 8,000 / 7,000 | |
| 30D ATM IV / skew | 14.5% / 12.4 | +1.5 / +2.3 | 13.0% / 10.1 |
1. The tape: a narrow, violent selloff
Worries about how much the AI build-out costs, and how it gets financed, hit tech again. Nvidia fell 4.4% and was the biggest single drag on the S&P 500. Meta lost about 7%. Revenue beat, but profit missed, and the company announced a new share class to help fund AI spending. Lam Research fell 11.8% on guidance slightly below expectations, CoreWeave dropped about 10% on debt worries, and the SOX semiconductor index fell more than 6%.
Underneath the index, though, the market was green. About two out of three S&P 500 stocks rose, and staples, utilities, healthcare and financials all finished higher. Procter & Gamble gained 5.6% and Blackstone about 8%. The Dow ended flat and the Russell 2000 slightly up.
Cross-asset, Brent rose 4% to about $113, a five-month high, on Middle East supply risk. Even so, the 10-year Treasury yield fell back below 5%, to roughly 4.95–4.97% from 5.13%, as money moved into bonds. Jobless claims dropped to 194,000, a three-month low.
Why it matters for vol: a cap-weighted selloff with positive breadth is a concentration event. The index fell because its biggest weights fell. Index vol and skew still repriced sharply, as the charts below show.
2. Dealer gamma: back below the line
One day after reclaiming the gamma flip, SPX gave it back. Net GEX across all expiries is −$36.4B per 1% move, a swing of almost $78B from Wednesday. The flip itself barely moved, to 7,714, so the close at 7,663 sits 51 points (0.7%) below it.
The strike map shows how tight this is. The biggest negative strike is 7,650, 13 points under the close, with more heavy put gamma at 7,600 and 7,500. Positive gamma doesn't start until about 7,780. For near-dated expiries (within 30 days), the picture is darker: GEX is −$52.9B, the flip is 7,748 and the put wall is 7,650.
The profile shows how dealer gamma would change if SPX moved, and how much of it is about to expire. Two takeaways:
A lot of the short gamma is very short-dated. Strip out just Friday's and Monday's expiries, and net gamma at today's price roughly halves, from about −$38B to −$20B. That's a large roll-off within two sessions, but the flip hardly moves (about 7,703).
The rest sits in the next four weeks. Remove everything through the November 20 monthly, and the flip drops to about 7,565. At today's price, the profile even turns positive. Below spot, the all-expiry curve falls to roughly −$105B by 7,400. Until SPX gets back above 7,714, hedging flows lean toward amplifying moves, not absorbing them.
Weekly vs monthly: where the short gamma lives
Splitting dealer gamma by expiry window shows how much of the negative gamma is short-dated, and where each window's levels sit.
| Window | Net GEX | Gamma flip | Call wall | Put wall | |
|---|---|---|---|---|---|
| SPX | All expiries | −$36.4B | 7,714 | 8,000 | 7,000 |
| SPX | Weekly (≤7 days) | −$24.4B | ~7,735 | 7,800 | 7,650 |
| SPX | Monthly (≤30 days) | −$52.9B | 7,748 | 8,000 | 7,650 |
| NDX | All expiries | −$2.0B | 29,608 | 29,675 | 28,000 |
| NDX | Weekly (≤7 days) | −$1.1B | ~29,600 | 29,800 | 28,250 |
| NDX | Monthly (≤30 days) | −$1.1B | ~29,420 | 29,675 | 27,500 |
Weekly = contracts expiring within 7 calendar days; Monthly = within 30 days (the site's expiry filter). "~" = recomputed with the site's method; other figures are the site's published values.
SPX weekly: expiries in the next 7 days alone carry −$24.4B, about two-thirds of the all-expiry total. Their flip sits near 7,735 with a 7,800 call wall and a 7,650 put wall. That is a tight band around spot, and most of it expires within a week.
SPX monthly: widen the window to 30 days and it gets more negative (−$52.9B, flip 7,748). That means expiries beyond 30 days are net long gamma, by roughly $16B. The short gamma is concentrated inside the next month, and the longer-dated book partly offsets it.
NDX fell 2.9% and dropped back into negative gamma (−$2.0B), 2.2% under its 29,608 flip. Unlike SPX, its longer-dated book doesn't offset the near term: the weekly and monthly windows are both about −$1.1B, and expiries beyond 30 days add roughly another −$0.9B. The weekly window has a 29,800 call wall and a 28,250 put wall. The monthly window has a 29,675 call wall, and its put wall is lower at 27,500.
RUT was green but still short gamma (−$1.3B), 46 points under its 2,830 flip.
3. The VIX complex: the front end did the work
The whole curve moved up, but not evenly. VIX1D jumped 33%, VIX rose 2.35 to 19.03, and VIX1Y gained only 0.6. The curve still slopes upward, but the 9-day to 30-day segment is now flat (18.9 vs 19.0).
The futures curve is where the stress shows. November settled at 19.38, only 1.8% above spot, down from a 9% premium a day earlier. December (19.23) is now below November, so M1→M2 is −0.77%. The site's badge still reads Contango, because November is above spot, but the front kink is the first crack. VVIX rose 13.4 points to 107.9, so demand for VIX upside rose sharply.
VIX/VIX3M rose to 0.946. It's not inverted, but it's higher than 87% of the past year's sessions. The March–April episode is the reference point: the ratio stayed above 1.0 for weeks.
4. Implied vs realized: a wide premium
SPX has realized only 9.5 vol over the past 21 sessions, today's 1.2% drop included. With VIX at 19.0, the 9.5-point gap is wider than on 89% of days in the past year. The market is paying up for protection it hasn't needed so far. That premium is where short-vol strategies earn their keep. It's also the cushion that a run of large daily moves would burn through quickly.
5. The SPX surface: skew steepened
Thirty-day ATM IV rose from 13.0% to 14.5%. Thirty-day skew (90% vs 110% moneyness) jumped from 10.1 to 12.4 points. Most of the demand was for downside, not calls. The 7-day smile is steep, with 90% puts around 36% vol, while the 29-day curve tops out near 26%. The 90D−30D term slope flattened to +0.1 points from +0.8. In the expiry table, October 30 stands out at 16.0% ATM, above its neighbors, which fits a heavy week ahead (FOMC and megacap earnings).
What I'm watching on Friday
- 7,650. The biggest negative strike and the near-dated put wall. A break opens up 7,600 and 7,500, the next big put strikes.
- 7,714–7,748. The all-expiry and near-dated gamma flips. SPX needs to get back above this zone for dealers to be long gamma again.
- Friday's expiry. A large share of the short gamma at spot expires on Friday and Monday. If SPX holds, the hedging drag fades quickly.
- VX Nov vs Dec and VIX/VIX3M. Does the front kink in futures persist, and does the ratio push toward 1.0?
- Calendar. S&P Global flash PMIs and final University of Michigan sentiment (including inflation expectations) on Friday. The FOMC meets next week (a hold is widely expected), megacap earnings follow, and the midterms are on November 3.
Sources
- AP via BNN Bloomberg: Sharp drops for AI stocks overwhelm markets worldwide as oil prices jump
- Yahoo Finance: S&P 500, Nasdaq tank as tech stocks sink amid AI trade worries
- Investrade: Market Review, October 22, 2026
- Investing.com: PMI data and consumer sentiment among releases due Friday
Volatility data: ilovevol.app, from Cboe delayed quotes. GEX assumes dealers are long calls and short puts.
This review is for informational and educational purposes only and is not investment advice. See the disclaimer.