Implied vs realized volatility

Implied volatility

Implied volatility (IV) is derived from option prices. It represents what the market expects volatility to be over a future period. The VIX is the most widely quoted measure of 30-day implied volatility for the S&P 500. IV is forward-looking and reflects supply and demand for options — not just statistical expectations.

Realized volatility

Realized volatility (RV) measures the actual price movement that occurred over a historical window. It is calculated from observed returns, typically using close-to-close or high-low-close methods. RV is backward-looking and factual — no model, no expectation.

The variance risk premium

Implied volatility almost always exceeds realized volatility. This persistent premium — called the variance risk premium — compensates option sellers for bearing tail risk. When the premium is wide, selling options has a statistical edge. When it compresses, the market may be underpricing risk.

When the spread inverts

• Realized exceeding implied is rare and signals that the market was caught off guard.
• Spread inversion during stress often precedes further volatility expansion.
• A compressed spread in calm markets can indicate complacency — hedging is cheap but rarely purchased.

How TheVIXtrader tracks the spread

The platform compares VIX (implied) against recent S&P 500 realized volatility and surfaces the relationship as part of the daily intelligence briefing. A widening premium signals normal conditions; compression or inversion triggers elevated-risk context in regime classification.