# Triple Witching, Sept 18, 2026: The Session Record

Source: https://squawkflow.com/videos/triple-witching-sep18
Retrieved: 2026-10-17T16:08:08.332Z
Uploaded: 2026-10-16
Duration: 1:59
Topic: Options Education
Video file: https://storage.googleapis.com/squawkflow-videos/triple-witching-sep18/triple-witching-sep18-1c048f8f.mp4
Captions: https://storage.googleapis.com/squawkflow-videos/triple-witching-sep18/captions-c60c2901.vtt

The SPX session record for triple witching on Sept 18, 2026 and that date's DIX reading, side by side. Dated, not a forecast. AI voice.

AI voice: the narration is a synthetic voice reading a script SquawkFlow wrote. Educational only, not investment advice. Nothing here is a forecast or a recommendation to trade.

## Chapters

- 0:00 Everything expires at once (https://squawkflow.com/videos/triple-witching-sep18?t=0)
- 0:26 The record (https://squawkflow.com/videos/triple-witching-sep18?t=26)
- 1:04 The other number that day (https://squawkflow.com/videos/triple-witching-sep18?t=64)
- 1:39 Wrap (https://squawkflow.com/videos/triple-witching-sep18?t=99)

## Related

- Explainer: https://squawkflow.com/learn/triple-witching-explained
- Tool page: https://squawkflow.com/opex

## Transcript

# Triple Witching, Sept 18, 2026: The Session Record

Narration: AI voice.

### Everything expires at once

Friday, September eighteenth, 2026. Triple witching. Cboe's definition: the simultaneous expiration of individual stock options, equity index options and equity index futures, four times a year. Cboe adds there is often an observed increase in trading volume and market volatility. So what does this one's record actually show?

### The record

The session record. SPX closed at 7,650.50, up 0.17%. High to low, 46.65 points. The morning read: no gamma side called. The page says the two estimators of dealer positioning disagree near the flip. Flip at 7,617.59: touched. Call wall untouched, closest approach 142.83 points. Put wall untouched, 110.52.

### The other number that day

Same session, a second number. The dark pool index, DIX, read 52.4%, the high of the page's 260-session window. Median, 45.4%. DIX is the dollar-weighted share of off-exchange volume in S&P 500 stocks that FINRA reports as short sales. Most of it is market makers filling customer purchases. It describes where volume traded, not who was buying. Not a signal.

### Wrap

Two dated facts, one session, side by side. Nothing here says one caused the other. Not a forecast. What settles on a witching day, and when, is on the learn page linked below. Educational only.

Full write-up with sources: [/learn/triple-witching-explained](/learn/triple-witching-explained)

Educational content, not investment advice.

Levels shown are as captured on 2026-10-16 01:55 ET; they are not current.