SPX dealer positioning, the week of September 21, 2026
Sep 21 to Sep 25 · 5 of 5 days traded · each session free to replay
| Day | Open | Close | Change | Range | Close to close | Flip at the close | Gamma at the close |
|---|---|---|---|---|---|---|---|
| Monday Sep 21 | 7694.2 | 7764.9 | +70.7 +0.92% | 88.3 | +116.7 | 7715.1 crossed 3x | positive |
| Tuesday Sep 22 | 7772.2 | 7764.7 | -7.5 -0.10% | 23.1 | -0.2 | 7765.4 crossed 23x | negative |
| Wednesday Sep 23 | 7755.6 | 7705.1 | -50.5 -0.65% | 62.7 | -59.6 | 7716.4 crossed 2x | negative |
| Thursday Sep 24 | 7669.3 | 7704.8 | +35.4 +0.46% | 55.0 | -0.4 | 7693.4 crossed 5x | positive |
| Friday Sep 25 | 7711.3 | 7743.4 | +32.1 +0.42% | 55.8 | +38.6 | 7731.3 crossed 8x | positive |
Week: +95.2 points (+1.24%), close to close from 2026-09-18.
Ranges: 284.8 points over 5 sessions, the largest 88.3 on 2026-09-21.
Zero-gamma flip at the close: 7715.1 on the first session, 7731.3 on the last (+16.3 points).
Closed in positive gamma: 3 of 5 sessions.
Events this week
- Sep 23
09:30VIX settlement
spot -9.2 in the 15 minutes after 09:30; flip 7656.4 → 7694.5; net gamma long - Sep 24
08:30Housing starts
Housing starts: actual 1275K / prior 1309K - Sep 24
16:05COST earnings - Sep 25
08:30Durable goods orders
Durable goods m/m: actual -0.0% / prior 0.9% - Sep 25
10:00UMich consumer sentiment (final)
Sentiment: actual 48.1 / prior 51.7; 1y inflation: actual 4.6% / prior 4%; 5y inflation: actual 3.4% / prior 3.3%
spot -21.3 in the 15 minutes after 10:00; flip 7619.6 → 7622.4; net gamma long
Prices are SPX at the minute. Change is close minus open; close to close is against the previous finished session. The zero-gamma flip is the terminal's measured flip at the close, and "crossed" counts the minutes the tape changed sides of it. Gamma at the close is where the close sat against that flip. Events are the market calendar's high and medium impact rows; the line under an in-session event is what the book did in the fifteen minutes after it, from the day's own payload. Nothing here is a forecast; see the Terms.