US S&P 500 50th Percentile 6M
US S&P 500 50th Percentile 6M stood at 3.6% 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 | |||||||||||
| 50th percentile (median change) | 3.6 | 3.44 | 3.63 | 3.44 | 3.5 | 3.48 | 3.47 | 3.49 | 3.19 | 3.84 | |
| 90th percentile (favorable scenario) | 13.98 | 13.99 | 14.3 | 14.15 | 13.9 | 14.35 | 14.61 | 14.59 | 14.33 | 15.23 |
Understanding US S&P 500 50th Percentile 6M
US S&P 500 50th Percentile 6M tracks the median expected price variance for the benchmark large-cap equity index over a six-month duration, derived from prevailing options pricing. The scope encompasses the exact midpoint of historical volatility expectations, effectively separating periods of heightened market stress from phases of unusual complacency, while excluding extreme tail risks. This median measure differs from extreme percentile metrics by providing a baseline central tendency of market turbulence rather than focusing on market panics or euphoric calms.
Published continuously without retrospective revisions, this series remains unaffected by traditional seasonal calendar adjustments. Analysts read this indicator by observing its position relative to long-term historical bands rather than tracking month-on-month percentage changes. This method offers an objective benchmark to determine whether current market conditions reflect typical operating environments or hidden structural shifts.