US S&P 500 90th Percentile 6M
US S&P 500 90th Percentile 6M stood at 13.98% on Sep 30, 2026, according to Minneapolis FED (Market-based Probability Densities). It is one of the indicators in the Implied volatility from options table (Value · Daily), with a complete series running from Jan 12, 2007 to Sep 30, 2026. The complete series with an interactive chart, free to download.
This indicator in the Implied volatility from options table
| Indicator | 30-09-2026 | 23-09-2026 | 16-09-2026 | 09-09-2026 | 02-09-2026 | 26-08-2026 | 19-08-2026 | 12-08-2026 | 05-08-2026 | 29-07-2026 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| S&P 500 Index, 6-month horizon | |||||||||||
| 90th percentile (favorable scenario) | 13.98 | 13.99 | 14.3 | 14.15 | 13.9 | 14.35 | 14.61 | 14.59 | 14.33 | 15.23 | |
| Implied standard deviation | 11.2 | 11.18 | 11.58 | 11.52 | 11.29 | 11.77 | 12.02 | 12.06 | 11.42 | 12.55 |
Understanding US S&P 500 90th Percentile 6M
US S&P 500 90th Percentile 6M measures the upper decile of expected price variance for the benchmark equity index over a six-month horizon, signaling extreme market anxiety embedded in options pricing. The scope includes severe downside risk pricing and heightened demand for portfolio protection, while deliberately excluding median and low-risk market environments. This series differs from median volatility indicators by isolating periods of acute systemic stress and financial market dislocation.
Updated in real time alongside trading activity, the indicator experiences no administrative revisions or seasonal distortions. Analysts evaluate this measure by comparing current high-water marks against long-term historical percentile distributions rather than assessing month-on-month growth. This contextual comparison helps researchers gauge the severity of market stress relative to historical precedents without relying on misleading short-term directional changes.