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Dealers dig deeper into short gamma; next week's event vol is already priced
SPX closed 81 points under its gamma flip with net GEX at −$42.6B, the VIX futures kink held, and the Oct 28–30 expiries carry a clear event premium. Here are the levels for Monday.
- Brent settled near $117 and broad selling hit the index: SPX −0.5% to 7,624, Dow −1.2%, while NDX finished flat. About three in four S&P 500 stocks fell.
- Dealer gamma got more negative, from −$36.4B to −$42.6B. SPX now sits 81 points (1.1%) under its 7,705 flip, with the weekly window alone carrying −$31.7B.
- VIX rose only 0.42 to 19.45 and realized vol is still under 10, but November VIX futures stay above December and the Oct 28–30 SPX expiries price ATM vol of 14–16% vs 10.6% for Monday.
Scoreboard
| Close | Chg | Prev | |
|---|---|---|---|
| SPX | 7,624 | −0.52% | 7,663 |
| NDX | 28,958 | −0.00% | 28,959 |
| RUT | 2,776 | −0.29% | 2,784 |
| VIX | 19.45 | +0.42 | 19.03 |
| VIX1D | 16.81 | +1.63 | 15.18 |
| VVIX | 109.7 | +1.8 | 107.9 |
| VX Nov / Dec | 19.61 / 19.50 | −0.60% M1→M2 | −0.77% |
| VIX / VIX3M | 0.950 | +0.004 | 0.946 |
| SPX net GEX | −$42.6B | negative gamma | −$36.4B |
| Flip / Call wall / Put wall | 7,705 / 8,000 / 7,000 | 7,714 / 8,000 / 7,000 | |
| 30D ATM IV / skew | 14.8% / 12.8 | +0.3 / +0.4 | 14.5% / 12.4 |
1. The tape: oil takes over from chips
Thursday was a narrow tech selloff. Friday was the reverse: tech held up and nearly everything else slipped. The S&P 500 fell 0.5% to 7,624 and the Dow dropped 1.2% (about 650 points). The Nasdaq Composite lost only 0.2%, and the Nasdaq-100 ended flat. Breadth was poor: roughly three of every four S&P 500 stocks declined, and NYSE decliners outnumbered advancers by about 1.7 to 1.
Oil was the main pressure point. Brent rose about 3% to settle near $116.70, a multi-month high, on renewed Middle East supply worries. WTI gained about 4% to roughly $103. Energy was the best sector, up about 2.5%. Staples, discretionary and financials each lost more than 1%. The 10-year Treasury yield edged up to about 4.99%.
Single names: American Express fell about 3–4% despite raising its outlook and announcing job cuts, and it was a big drag on the Dow. AT&T and T-Mobile dropped close to 8% on a report about a possible new wireless competitor, while tower owners Crown Castle and SBA rallied. SLB gained about 7% on earnings. Chips steadied after Thursday's rout, with Micron and AMD up about 2%. The final University of Michigan reading put October sentiment at 48.0, near record lows, with 1-year inflation expectations at 4.7%.
Why it matters for vol: the index slipped further under its gamma flip on a broad, oil-driven down day, yet VIX rose less than half a point. The market is not panicking. It is instead paying for specific dates next week, as the surface section shows.
2. Dealer gamma: further below the line
Net GEX across all expiries fell to −$42.6B per 1% move, from −$36.4B on Thursday. The flip barely moved (7,705 vs 7,714), but SPX did, so the gap widened from 51 points to 81 points (1.1%).
The strike map has shifted lower. The largest negative bucket is now 7,500 (−$8.0B), followed by 7,600 (−$7.1B), 7,650 (−$4.9B) and 7,700 (−$4.5B). SPX closed just above 7,600, so the second-largest put strike is 24 points away. Positive gamma still doesn't start until about 7,780, with the biggest call strikes at 7,900, 8,000 and 8,050.
The profile puts all-expiry gamma at today's price near −$53B. Two things stand out:
Monday and Tuesday matter less than Friday did. Removing the Oct 26 and Oct 27 expiries lifts gamma at spot to about −$38B, and the flip barely moves (about 7,699). The short gamma is no longer concentrated in the next two sessions. It is spread across next week's event dates.
Beyond the November monthly, the book is long. Strip out everything through Nov 20 and gamma at spot turns positive (about +$8B), with a flip near 7,572. The negative gamma is a one-month problem. Below spot, the all-expiry curve bottoms near −$104B around 7,200–7,400, so a move through 7,500 would not find dealer support quickly.
Weekly vs monthly: where the short gamma lives
Splitting gamma by expiry window shows that this week's short-dated contracts carry most of the risk, and that each window's levels sit in a tight band around spot.
| Window | Net GEX | Gamma flip | Call wall | Put wall | |
|---|---|---|---|---|---|
| SPX | All expiries | −$42.6B | 7,705 | 8,000 | 7,000 |
| SPX | Weekly (≤7 days) | −$31.7B | 7,725 | 7,800 | 7,600 |
| SPX | Monthly (≤30 days) | −$54.2B | 7,737 | 8,000 | 7,500 |
| NDX | All expiries | −$1.31B | 29,414 | 29,675 | 28,000 |
| NDX | Weekly (≤7 days) | −$0.49B | 29,239 | 29,400 | 28,000 |
| NDX | Monthly (≤30 days) | −$0.42B | 29,141 | 29,675 | 28,000 |
Weekly = contracts expiring within 7 calendar days; Monthly = within 30 days (the site's expiry filter). All figures are the site's published values; our recomputation matched every window.
SPX weekly: the next 7 days carry −$31.7B, about three-quarters of the all-expiry total and up from −$24.4B on Thursday. This window now covers the FOMC (Wednesday) and the Oct 30 expiry. Its flip is 7,725, its call wall 7,800 and its put wall 7,600, just 24 points below the close.
SPX monthly: the 30-day window is −$54.2B (flip 7,737), barely changed from −$52.9B. Its put wall is lower, at 7,500, where the largest monthly put strike sits, and its call wall is 8,000. Expiries beyond 30 days are net long about $11.6B, which partly offsets the near term.
NDX was flat on the day, and its short gamma eased from −$2.0B to −$1.31B. The index is still 1.6% under its 29,414 flip. The weekly window (−$0.49B, flip 29,239) is slightly more negative than the 30-day window (−$0.42B, flip 29,141), so expiries 8–30 days out are close to neutral. Beyond 30 days NDX is still short about $0.9B, unlike SPX. All three windows share a 28,000 put wall. The call wall is 29,400 for the weekly and 29,675 for the monthly, which has a large call strike near 29,600–29,700.
RUT fell 0.3% and remains short gamma (−$1.34B), 63 points under its 2,839 flip, with a 2,850 call wall and a 2,700 put wall.
3. The VIX complex: calm on top, kinked underneath
The index curve moved up modestly and kept its upward slope: VIX1D 16.8, VIX9D 18.7, VIX 19.45, VIX3M 20.5, VIX1Y 22.8. VIX1D rose 1.6 points, but VIX9D actually slipped 0.2. That re-opened a small gap between the 9-day and 30-day points (18.7 vs 19.45), which were flat on Thursday.
Futures settled higher across the curve, by about 0.1–0.3 points. November settled at 19.61, only 0.8% above spot, and December (19.50) is still below November. M1→M2 improved slightly to −0.60% from −0.77%, so the front kink held for a second day. From January on, the curve is in normal contango (20.20 and up). VVIX rose 1.8 points to 109.7, which keeps demand for VIX upside elevated.
VIX/VIX3M is 0.950, up from 0.946 and higher than 88% of the past year's sessions. It's not inverted, but it is holding near the top of its range. In the past year, the ratio traded above this level mostly during stress episodes: early December 2025, March–April, and brief spikes in June and August.
4. Implied vs realized: still a wide cushion
Two straight down days lifted SPX 21-day realized vol only to about 9.7. With VIX at 19.45, the implied-minus-realized gap is about 9.8 points, wider than 90% of the past year. The options market is pricing roughly twice the vol SPX has actually delivered. That cushion is large, but next week is exactly the kind of calendar that can close it.
5. The SPX surface: event vol is in the price
Thirty-day ATM IV rose to 14.8% from 14.5%, and 30-day skew (90% vs 110%) steepened to 12.8 points from 12.4. The 90D−30D term slope is +0.2 points, still nearly flat. The 7-day smile (Oct 30) is steep, with 90% puts around 35% vol, and its call wing also curls up past 104%. The 31-day curve (Nov 23) tops out near 28% at 88%.
The expiry table shows the event pricing clearly. ATM IV is 10.6% for Monday and 12.4% for Tuesday, then jumps to 14.3% for Wednesday (FOMC day), 15.5% for Thursday and 16.1% for Friday Oct 30, before dropping back to 14.6% on Nov 2. The market is paying for a few specific days, not for a regime change.
What I'm watching on Monday
- 7,600 and 7,500. The weekly put wall and the monthly put wall, also the second- and first-largest negative strikes. A break of 7,600 puts 7,500 in play, where the profile shows little dealer support.
- 7,705–7,737. The all-expiry, weekly and monthly gamma flips. SPX needs to retake this band for dealers to be long gamma again. The weekly 7,800 call wall sits just above.
- The Oct 28–30 event premium. ATM IV of 14–16% for Wednesday through Friday vs 10.6% for Monday. Watch whether that premium holds or bleeds early in the week.
- VX Nov vs Dec and VIX/VIX3M. The front kink held for two days. A move of the ratio toward 1.0 would confirm stress; a return of Nov below Dec would ease it.
- Calendar. Verizon reports Monday; Coca-Cola and UPS on Tuesday. The FOMC decision is Wednesday (a hold is widely expected). About a third of the S&P 500 reports this week, including Alphabet, Microsoft and Amazon, and PCE inflation is due late in the week. Midterms follow on November 3.
Sources
- Reuters via Lufkin Daily News: Wall Street closes lower to end rocky week
- AP via The Business Journal: Wall Street loses ground under pressure from rising oil prices
- Yahoo Finance: Dow sinks 600 points, S&P 500, Nasdaq drop to cap a volatile week, oil prices rise
- TheStreet: Stock Market Today (Oct. 23, 2026)
Volatility data: ilovevol.app, from Cboe delayed quotes. GEX assumes dealers are long calls and short puts. VIX futures use settlement prices. 21-day realized vol for Oct 23 is computed from SPX closes.
This review is for informational and educational purposes only and is not investment advice. See the disclaimer.