Definition: Call Option

Buying an equity call gives the owner the right, but not the obligation, to buy 100 shares of underlying stock at a specified price (the strike price) at any time before a specific time (the expiration date). This is a bullish strategy because the value of the call tends to increase as the price of the underlying stock rises, and this gain will increasingly reflect a rise in the value of the underlying stock when the market price moves above the option's strike price.

The profit potential for the long call is unlimited as the underlying stock continues to rise. The financial risk is limited to the total premium paid for the option, no matter how low the underlying stock declines in price. The break-even point is an underlying stock price equal to the call's strike price plus the premium paid for the contract. As with any long option, an increase in volatility has a positive financial effect on the long call strategy while decreasing volatility has a negative effect. Time decay has a negative effect.