How the VIX is built

Methodology version 1.0. List date Nov 9, 2026.

This index

• Cboe's Volatility Index at each day's close, as Cboe publishes it, daily since January 1990.
• The VIX is computed by Cboe from the prices of S&P 500 index options and reads as the annualised swing, in per cent, that options traders expect over the next 30 days. Above 30 is usually read as fear; below 15 as calm.

Changes

No changes since the list date.

Source: Cboe Global Markets, VIX daily history.