ALGO·SUCCESSION
The Daily Read
Wednesday 16 September 2026
SPY at 757.39: the flip sits 8.90% below here (67 points) at 690, out of reach. The level in play is 766, 1.14% above here (9 points). SPX is carrying a live Quantitative Exhaustion alert, the Buy Zone levels, and what each of them has actually done across 477 triggers since 2011, are below.
The tape, across assets
Crude -0.92% | VIX -0.87% | Gold +0.87% | 10-year yield +0.71% | Yen +0.44% | Long treasuries -0.27% | Bitcoin +0.23% |
Start with the tape: Crude down 0.92%, VIX down 0.87% and Gold up 0.87%. Only 2 instruments outside equities is carrying a clear risk signal right now, VIX, Gold. That is not enough to call the configuration one way or the other, so this is a note about one instrument rather than a read on the tape. The levels below are doing more work today.
Crude down 0.92%. Energy is the one input that prices in two directions at once (as a growth signal and as a cost) which is why a move this size turns up in places that have nothing to do with oil. It reaches the inflation data through the goods basket with a lag measured in months, so it does not move the PPI print tomorrow. It moves the one after. What it changes today is the EXPECTATION, and expectations are what the bond market trades.
VIX down 0.87% is protection getting cheaper. Falling implied volatility is as much about hedges being lifted as about calm arriving. Quad witching Friday matters to that: a large block of open interest expires, and the dealer hedges standing behind it come off with it. The book can behave differently the following week for no reason other than that.
What is driving it
None of the levels below came out of these headlines. The gamma flip is derived from open interest already sitting in the option book, and the exhaustion alert is dated 11 September, on the map before any of this was written. Headlines are what the tape reacts to. The levels are where that reaction runs into positioning and changes character, which is why the same news can barely register one week and travel the next.
On the calendar
FOMC · todayPPI · tomorrowOPEX · Friday
FOMC lands today. Sessions in front of an event like that tend to go quiet and directionless as positioning flattens, a narrow, choppy tape before one of these is the normal thing, not a signal. The levels below still hold; they just get tested with less conviction until it clears.
Set that against the gamma regime and the two agree. SPY sits above the gamma flip, where dealer hedging leans against the move and compresses the range, the same direction the flattening into today is already pushing. A narrow, unsatisfying tape is the normal outcome of that pairing rather than a sign anything is wrong, and it is the specific condition under which patience costs least.
The levels that matter today
SPY at 757.39: the flip sits 8.90% below here (67 points) at 690, out of reach. The level in play is 766, 1.14% above here (9 points).
Above the flip by a distance, so dealer hedging is damping the range across everything price is actually trading in. The flip is not today's level. The strike below is.
766 is the king node, the strike carrying the most positive gamma, 1.14% above here (9 points). It is where the tape most often stalls into an expiry, because that is where dealers defend hardest. Not a target.
What kills it: The flip at 690 is 8.9% away and not in play. What is in play is the strike named below.
Quantitative Exhaustion · SPX
Two consecutive Band-0 days trigger the signal. Instead of a single predicted-bottom price it ships a Buy Zone, the range between the Predicted-Bottom High (PBH) and the Predicted-Bottom Low (PBL), anchored off the Day 4-5 pivot high.
Triggered 2026-09-11 13:30:00 · NORMAL VIX regime · Anchored off 7,677.02
7,495.84NOT YET REACHED
PB1 · THE SHALLOW RUNG
The first line price would have to reach for the Buy Zone to have meant anything at all.
From here, price would have to fall another 1.20% (90 points) to reach it.
WHAT THIS LINE HAS ACTUALLY DONE
The shallow target: Fib 0.236 × 10 = 2.36% off the anchor, the same in every VIX regime. Measured on 477 triggers with a resolved window, on SPX, SPY, QQQ and IWM, 2011-2026: price reached the PB1 band (whose shallow edge is the 2.124% variance line pb1_hit actually tests) inside the day 8-19 window 43.2% of the time, against 35.7% on matched signal-free bars: a lift of +7.5 pp, 95% interval +3.5 to +11.2 pp. At the 2.36% line itself it is 38.4% against 31.6%, lift +6.8 pp. The lift is the number; 43% on its own is not, because a shallow pullback is common with or without a trigger.
7,202.58NOT YET REACHED
PB2 · THE DEEP RUNG
The Fib-pure 6.18% line. The deeper of the two, and the only one of the deep pair that separates from chance at all.
From here, price would have to fall another 5.32% (383 points) to reach it.
WHAT THIS LINE HAS ACTUALLY DONE
PB2 is drawn twice: the primary line is the p90 stretch-bottom fitted per VIX regime, the secondary is the Fib-pure 6.18% (0.618 × 10). Measured on 477 triggers in the day 8-40 hunt, only the Fib-pure line separates from its base at all, and barely: 15.5% against 12.2%, lift +3.3 pp, interval +0.8 to +6.3 pp. The 7.86% and 10% per-regime primaries do not separate at any window. Inside the day 8-19 window nothing deep separates. The deep lines are mostly a map of how far a selloff can run, not evidence that it will.
WHERE THIS MODEL FAILED ITS OWN TEST
The alert is dated one session late
A trigger is dated on the LAST zero-succession day of its streak, and whether today is the last one is not known until tomorrow closes: if tomorrow is also quiet the streak extends and the date moves. So a Q.E. alert is a one-session-lagged label, not a same-day signal. Every measured number on this page starts its forward walk at day 6, well past that, so nothing here depends on the difference.
The 16-19 window is not where the low lands
Of the 477 triggers whose day 8-40 hunt completed, the deepest low landed inside days 16-19 11.5% of the time, against 10.6% on matched signal-free bars, a lift of +0.9 pp with an interval of -3.4 to +5.1 pp. Four sessions out of thirty-three is about 12% by chance alone. Treat the band as a calendar marker, not a forecast.
The Deep tier is untested, not conservative
The -16.18% extension was reached on 1 of 477 triggers inside the day 8-19 window in fifteen years (8 of 477 by day 40), no more often than on bars with no trigger at all. It is a drawn extreme, not a measured expectation.
Past this week · SPY
This week 43%The monthly cycle 53%Next cycle 4%
The next cycle book centres at 759, 0.2% above spot of 757.39.
Dealers are net LONG gamma out there, so if price reaches that area the hedging into it leans against the move.
Read that as structure, not as a pin. Gamma per contract decays with time to expiry, so a far-dated strike carrying the same open interest as a weekly exerts a fraction of the hedging pressure, the dealer's delta barely moves as spot passes through it. It is a level that matters slowly, and it says nothing about direction on its own.
What would change this read
SPY closes below 690
the hedging regime flips from damping to extending. The same headline gets a larger move after that than it would have got before it.
FOMC Decision, today
the compression in front of it releases. Which way is not knowable from here; that it releases is the part worth being ready for.
SPX reaches 7,495.84
the shallow Buy Zone rung is tagged, the one rung with a measured lift behind it. The rate, and the three findings that qualify it, are quoted in the exhaustion section.
Structural reference, not advice. Levels describe dealer exposure in the book; a wick through one is not failure, acceptance beyond it is what changes the structure. Where a historical rate appears above it is quoted from our own walk-forward measurement, including the tests that went against us (
all of them here).