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VIX: Wall Street's Gauge of Expected Market Volatility

By Imperialpedia Staff

The VIX, formally the CBOE Volatility Index, measures the market's expectation of how volatile the S&P 500 will be over the next 30 days. It's calculated from the prices of S&P 500 index options and is often nicknamed the "fear index," since it tends to spike sharply during periods of market stress and uncertainty.

How the Index Is Actually Calculated

The VIX doesn't come from historical price data at all — it's derived from a weighted average of prices across a wide range of S&P 500 index options, translating what options traders are collectively paying for downside and upside protection into an annualized expected volatility figure.

Why the VIX and Stock Prices Usually Move Opposite

The VIX has a well-documented tendency to rise when stock prices fall and fall when stock prices rise, since demand for protective options tends to surge during selloffs and fade during calm, rising markets. This inverse relationship is strong enough that some traders use VIX levels as a rough sentiment gauge for the broader market.

You Can't Trade the VIX Directly

The VIX itself is just a calculated index, not a tradable asset, so investors seeking exposure to it use VIX futures, options, or exchange-traded products built on those derivatives instead. These products often behave quite differently from the spot VIX level over time, due to how futures pricing and roll costs work, which surprises investors who expect a 1-to-1 relationship.
IMPORTANT
A high VIX reading reflects expected future volatility, not a prediction of market direction — a spiking VIX means the market expects big moves, but it doesn't say whether those moves will be up or down.

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