3-day HV
S&P 500 3-Day Historical Volatility Below 1 New-trigger client note · September 10, 2026 The S&P 500’s realized (historical) volatility over the trailing 3 sessions dropped to just 0.92, below the 1.0 threshold that marks an unusually placid stretch even by the standards of a low-volatility market. This is a fairly rare condition — 56