An option is a contract that gives you the right, but not the obligation, to buy or sell an asset at a specific price before a certain date. That single sentence contains everything that matters – but unpacking it takes some work.
Key Takeaways
- Options give you the right to buy (call) or sell (put) at a fixed price, called the strike
- You pay a premium for that right – your maximum loss if you buy an option
- Options expire – they have a finite life measured in days, weeks, or months
- 100 shares of stock is the standard underlying for one options contract
- You can buy options (defined risk) or sell them (income, different risk profile)
The Two Types: Calls and Puts
Every option is either a call or a put:
| Type | Gives You the Right To | Profits When | Common Use |
|---|---|---|---|
| Call | Buy the stock at the strike price | Stock rises above strike | Bullish directional plays, income via covered calls |
| Put | Sell the stock at the strike price | Stock falls below strike | Bearish plays, portfolio protection, cash-secured puts |
The Key Terms You Need
Strike Price
The fixed price at which you can buy (call) or sell (put) the underlying. If you own a call with a $50 strike and the stock is at $60, your option lets you buy at $50 – worth $10 of intrinsic value.
Expiration Date
Options don’t last forever. Every contract has an expiration date, and after that date the option is either exercised (if it’s in the money) or it expires worthless. Common expirations run weekly, monthly, or out to 2 years (LEAPS – Long-term Equity AnticiPation Securities).
Premium
What you pay for the option. If you buy a call option for $3.50, that’s your premium – and since each contract represents 100 shares, you’re paying $350 total. This is your maximum loss if you hold through expiration and the option expires worthless.
In the Money vs. Out of the Money
| Term | Call Option | Put Option |
|---|---|---|
| In the Money (ITM) | Stock price above strike | Stock price below strike |
| At the Money (ATM) | Stock price near strike | Stock price near strike |
| Out of the Money (OTM) | Stock price below strike | Stock price above strike |
Buying vs. Selling Options
Most people learn options from the buying side first, but selling options is equally common and has a fundamentally different risk profile:
A Simple Example
Stock XYZ is trading at $100. You buy one call option with a $105 strike expiring in 30 days for a $2.00 premium ($200 total).
- If XYZ rises to $112 by expiration: your option is worth at least $7 (112 – 105). You profit $5 per share, or $500 minus your $200 premium = $300 gain.
- If XYZ stays at $100 or falls: your option expires worthless. You lose your $200 premium. Nothing more.
This is why options are described as having defined risk when you’re the buyer – you know your worst case before you enter the trade.
Why Traders Use Options
- Leverage: Control 100 shares for a fraction of the cost of buying shares outright
- Income: Sell covered calls or cash-secured puts to generate regular premium income
- Hedging: Buy puts to protect a stock position against a decline
- Defined risk: Risk exactly the premium, no more, when buying options
What to Learn Next
Understanding what options are is the foundation. Next, it’s worth getting familiar with implied volatility (which determines how expensive options are), the Greeks (which tell you how your option will behave), and how to read an options chain (where you actually select strikes and expirations).
Frequently Asked Questions
- What is the difference between a call and a put option?
- A call option gives the buyer the right to purchase 100 shares of the underlying at the strike price before expiration. Buyers of calls profit when the stock rises above the strike plus the premium paid. A put option gives the buyer the right to sell 100 shares at the strike price. Buyers of puts profit when the stock falls below the strike minus the premium paid. Sellers of calls and puts take the opposite side and collect the premium upfront.
- What happens if an option expires worthless?
- If an option expires out of the money, it expires worthless and the buyer loses the entire premium paid. The seller of that option keeps the full premium as profit. For example, if you buy a call option for $2.00 and the stock never rises above the strike price, you lose $200 at expiration. This is the most common outcome for retail options buyers, which is why many experienced traders focus on selling premium rather than buying it.
- How much does one options contract actually control?
- One standard options contract controls 100 shares of the underlying stock or ETF. This is the options multiplier. If a call option is priced at $1.50, the actual cost to buy one contract is $150 (100 x $1.50). This leverage means options can provide significant market exposure for a fraction of the cost of buying shares outright, but it also means percentage gains and losses are amplified.
- Can you lose more than you invest with options?
- If you buy options (calls or puts), your maximum loss is limited to the premium paid. You cannot lose more than you invested. However, if you sell naked (uncovered) options without owning the underlying, losses can theoretically be unlimited on the upside for short calls, or substantial on the downside for short puts. Defined-risk strategies like vertical spreads and iron condors cap your maximum loss at the spread width minus credit received.