📊 The number you trust most is only half true.
Everyone watches volume. But volume resets to zero every session. It tells you something happened, not whether it stuck.
Open interest is the number that answers that. Except close to two thirds of SPX options volume now expires the same day it trades, so open interest never records it.
Inside:
Why the VIX at its 2026 low disagrees with the options chain
The two-number filter that separates churn from conviction
The one thing neither number shows you
Every figure sourced to Cboe and options-flow data, links included
3 min read. Nvidia reports on the 26th and Jackson Hole runs the three days straight after, so this is worth reading before the week turns.
👉 [Read it here]
We go deeper on the 25th, 7.30pm. Zoom link drops in this channel.
Quant X Newsletter
70% of SPX Options Volume Expires Before Open Interest Can Count It.
The number that catches what volume misses has a blind spot of its own.
4August 20, 2026 2.3K 1
