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The index meant to reflect how much volatility the market expects over the coming month, and why it tends to spike specifically when the market falls, not when it rises.
The VIX (CBOE Volatility Index) is derived from S&P 500 options prices and reflects the expected volatility (implied volatility) of the index over the next 30 days, according to the market itself — not a forecast someone writes, but what option prices actually 'price in.'
VIX tends to spike sharply specifically during sharp market declines, and stays relatively low even during strong rallies — not by random asymmetry, but because demand for insurance (protective put options) rises dramatically when investors fear further declines, while demand for extra upside is less urgent during rallies. Values above 30 are generally considered significant market stress; below 15 is considered relative calm.
VIX doesn't say which direction the market will move — only how much movement (in either direction) the market expects. A high VIX can also precede a sharp recovery, not just continued decline. It's a tool for measuring uncertainty, not a tool for predicting direction.
When VIX is high, all stocks tend to move more sharply — including ones with a stable business and no real change. Meaning part of a single stock's movement during a high-VIX period reflects overall market mood, not necessarily something that happened to the company itself.
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The information in this guide is intended for general educational purposes only and does not constitute investment advice. Full details on the disclaimer page.