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A trader who expects a stock s price to increase can buy a call option to purchase the stock at a fixed price strike price at a later date, rather than purchase. Figure 1 shows that implied volatility fluctuates the same way prices do Implied volatility is expressed in percentage terms and is relative to the underlying stock.
The CBOE Volatility Index, known by its ticker symbol VIX, is a popular measure of the stock market s expectation of volatility implied by S P 500 index options. Historical Volatility data, Implied Volatility data, and the Current Implied Volatility Percentile for all stock, index and futures options updated weekly.