Call Options Explained: Strike Price, Expiration & Premium

Understand how call options work, including strike price, expiration date, and premium. A plain-English guide for individual investors learning options trading.

Call Options Explained: Strike Price, Expiration & Premium

A call option is a financial contract that gives the buyer the right — but not the obligation — to purchase 100 shares of a stock at a specific price before a set date. Understanding the three core components of a call option is essential for any investor exploring options trading.

The Three Key Components of a Call Option

1. Strike Price

The strike price (also called the exercise price) is the price at which the option buyer has the right to buy the underlying stock.

  • If a stock is trading at $50 and you sell a call with a $55 strike price, the buyer can only purchase shares at $55 — regardless of where the stock is trading in the market.
  • In the Money (ITM): Strike price is below the current stock price — the option has intrinsic value.
  • At the Money (ATM): Strike price equals the current stock price.
  • Out of the Money (OTM): Strike price is above the current stock price — the option has only time value.

2. Expiration Date

Every options contract has an expiration date — the last day the option can be exercised. After this date, the contract is worthless.

  • Weekly options expire every Friday
  • Monthly options expire on the third Friday of each month
  • LEAPS are long-term options that expire up to 2–3 years out

Time matters because options lose value as they approach expiration — a concept called time decay or theta decay.

3. Premium

The premium is the price paid by the option buyer (and received by the option seller) for the contract. It's quoted per share, and since each contract covers 100 shares, multiply by 100 for the total dollar amount.

Example: A $2.00 premium = $200 received per contract sold.

The premium is influenced by:

  • Current stock price vs. strike price
  • Time remaining until expiration
  • Implied volatility (market's expectation of future movement)
  • Interest rates and dividends

Buying vs. Selling Call Options

| | Buyer | Seller (Covered Call Writer) | |---|---|---| | Right/Obligation | Right to buy shares | Obligation to sell shares | | Premium | Pays premium | Receives premium | | Max Profit | Unlimited | Limited to premium + strike appreciation | | Max Loss | Premium paid | Substantial (offset by stock ownership) |

Why This Matters for Covered Call Writers

As a covered call seller, you receive the premium upfront. Your goal is for the stock to stay below the strike price so the option expires worthless — letting you keep the full premium and repeat the process.

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