Options Contract Basics: Calls, Puts, Strikes, and Expiration
By VantureCap · Published July 15, 2026 · Updated July 21, 2026 · 7 min read
An option is a contract whose value depends on an underlying market and a deadline. Buying the contract gives you a right; selling it accepts the matching obligation. The contract does not promise that the market will move your way, and its quoted price is not its total dollar cost.
Calls and puts are mirror images
At expiration, a call has cash value when SPX settles above its strike. A put has cash value when SPX settles below its strike. These rules describe the contract’s value, not the buyer’s profit: the buyer first paid a premium.
| Contract | A buyer generally wants | Cash value at expiration | Worthless when |
|---|---|---|---|
| Call | SPX above the strike | max(settlement − strike, 0) × $100 | settlement is at or below the strike |
| Put | SPX below the strike | max(strike − settlement, 0) × $100 | settlement is at or above the strike |
A call is not automatically a bullish trade, and a put is not automatically a bearish trade. Traders can buy or sell either one. The direction, price paid or received, and any second leg determine the position’s actual risk.
Read the contract one field at a time
| Field | Plain-English meaning |
|---|---|
| Underlying | the market the option follows; here, the SPX index level |
| Strike | the fixed comparison line used to calculate settlement value |
| Expiration | the deadline when the contract’s final value is determined |
| Premium | the quoted price paid by the buyer and received by the seller |
| Multiplier | SPX uses $100 per quoted point per contract |
| Long / short | long means bought; short means sold |
Worked call example
Suppose one 4,560 SPX call costs 7.50 points = $750. At expiration:
| SPX settlement | Call cash value | Buyer P&L before costs | Why |
|---|---|---|---|
| 4,550 | $0 | −$750 | settlement is below the strike |
| 4,564 | $400 | −$350 | 4 points of value did not repay the premium |
| 4,572.50 | $1,250 | +$500 | 12.5 points of value minus the $750 premium |
The call is in the money at 4,564 because settlement is above the strike, yet the buyer still loses $350. The expiration breakeven is 4,560 + 7.50 = 4,567.50. “In the money” describes contract value; it does not guarantee profit.
How one option becomes a vertical spread
A vertical pairs two calls or two puts with the same expiration but different strikes: one contract is bought and the other is sold. The second leg limits what the position can gain and lose. That is why the trainer deals verticals instead of uncovered short options.
- Two calls form a call vertical.
- Two puts form a put vertical.
- The distance between their strikes is the width.
- The difference between their premiums is the net credit or debit.
Settlement determines the final contract value, but quotes can move sharply before expiration. Defined risk caps the loss; it does not make the path calm or the trade small.
Knowledge check: put value and buyer P&L
A 4,500 put costs 6.20 points = $620. If SPX settles at 4,488, the put has 12 points × $100 = $1,200 of cash value. Subtract the $620 premium: the buyer’s P&L is +$580 before fees and fill differences.
Keep learning
- Learn what the underlying SPX chart records
- Combine two contracts into the four vertical spreads
- See how settlement price maps to spread P&L
- Look up the trainer’s remaining terms
Bank this lesson
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Playbook Trainer is an educational game built on historical market data. Nothing on this page is investment advice or a recommendation to trade. Options involve substantial risk; defined-risk spreads can lose their full maximum loss. Scenario dates are masked, and prices reflect historical option quotes with simplified fills.