SITM gamma levels
From the closing options book · October 19, 2026
SITM closed at 495.75 on October 19, 2026. Its call wall was 580, put wall 540, the Apex (the strike with the most dealer gamma) 540. Net dealer gamma was negative, so hedging tends to amplify moves.
These are the October 19, 2026 closing levels. Members see SITM's board live all session, with the odds of reaching each level.
SITM's closing options book on October 19, 2026 carried −$712K of net dealer gamma spread across 5 expirations and 39 contracts. The sign is negative, so hedging runs with the move rather than against it.
The heaviest call-side strike sits at 580 and the heaviest put-side strike at 540, a band 8.1% wide. SITM has averaged 6.04% between its high and its low over the last 88 sessions, which makes the full width of that band about 1.3 average sessions of travel. It closed below the put wall entirely.
SITM closed at 495.75 — 17% below the call wall and 8.9% below the put wall. The put side is the nearer of the two at 8.9% away, which is the only reason it is worth watching more closely than the other. Most levels drawn on a chart are never reached at all, and the distance is what separates them.
SITM's apex — the strike carrying the most gamma in absolute terms — is 540, the same strike as its put wall. When those stack on one level the book is concentrated rather than spread, and that single strike is doing most of the work.
Across the last 10 recorded sessions its call wall has moved almost every session, and its put wall has moved almost every session. Walls that stay put and walls that migrate every session are different objects.
What SITM's walls are — and aren't
SITM's book has been recorded on 88 sessions. Its average daily range over that stretch was 6.04% of price. Walls are where dealer hedging is heaviest — positive gamma absorbs moves, negative gamma amplifies them. They are not bounce points, and across our grading they contained price no better than a same-width band around the prior close.
SITM levels, last 10 sessions
| Session | Close | Apex | Call wall | Put wall |
|---|---|---|---|---|
| Oct 19 | 495.75 | 540 | 580 | 540 |
| Oct 16 | 472.14 | 540 | — | 540 |
| Oct 15 | 501.59 | 500 | 590 | 500 |
| Oct 14 | 524.93 | 510 | 610 | 510 |
| Oct 13 | 579.66 | 600 | 670 | 600 |
| Oct 12 | 570.07 | 600 | 640 | 600 |
| Oct 9 | 612.37 | 650 | 640 | 650 |
| Oct 8 | 645.06 | 650 | 640 | 650 |
| Oct 7 | 665.16 | 700 | 640 | 700 |
| Oct 6 | 711.06 | 700 | 750 | 700 |
Common questions
SITM's heaviest call-side gamma strike is 580, measured from the closing options book on October 19, 2026. That is 17% above where it closed, against an average daily range of 6.04%.
The heaviest put-side strike is 540, 8.9% above the October 19, 2026 close. Together with the 580 call wall it brackets a band 8.1% wide.
SITM does not have a well-defined gamma flip in the current book.
Not reliably. Walls mark where dealer hedging is heaviest — positive gamma absorbs moves, negative gamma amplifies them — but levels are not bounce points, and across our grading walls contained price no better than a same-width band around the prior close (SITM's book has been recorded on 88 sessions).
No. This page is built from the closing options book and rebuilt each night, so it describes October 19, 2026. Walls build and dissolve through a session — the live intraday board is inside FlowMonkey, and a free 15-minute delayed SPY board is public at flowmonkey.net/spy-gamma-heatmap.
These are closing levels. The board moves all day.
Walls build and dissolve through the session. FlowMonkey shows the live board on 400+ symbols, with every level priced by whether price can actually reach it today. Start with the free SPY board — no account needed.
Levels are measured from the closing options book and rebuilt nightly. Gamma is an estimate of dealer hedging pressure, not a forecast of direction. Not investment advice.