Call Option¶
A call option is a standardized contract that gives its buyer the right — but not the obligation — to purchase 100 shares of an underlying stock at a predetermined strike price on or before a specified expiration date. The buyer pays a premium for this right; the seller collects that premium and assumes the obligation to deliver shares upon exercise. Calls are the core instrument of bullish options positioning, with maximum loss for the buyer fixed at the premium paid.
HOW IT WORKS¶
The buyer profits when the underlying stock rises above the strike price by more than the premium paid. Payoff at expiration equals max(0, Stock Price − Strike) − Premium Paid, with breakeven at Strike + Premium Paid. Before expiration, a call's market price reflects both intrinsic value (max(0, Stock Price − Strike)) and extrinsic value, which is eroded daily by theta decay and sensitive to implied volatility, interest rates, and dividends. A call is in-the-money (ITM) when the stock trades above the strike, out-of-the-money (OTM) when below. Delta — near 0.50 for at-the-money calls — measures how much the option price moves per $1 change in the stock.
IN TAPEBOARD¶
Tapeboard displays live call chains with strike, expiration, bid/ask, delta, implied volatility, and open interest in a unified options ladder. Use the payoff visualizer to plot breakeven and max-loss scenarios before entering a position. The Greeks panel updates in real time so you can monitor theta burn and delta exposure as the underlying moves. For multi-leg strategies built around calls — such as covered calls or bull call spreads — Tapeboard's strategy builder aggregates net premium, combined Greeks, and profit/loss curves across all legs in a single view.