What are options?
- Options give you the right, not the duty, to trade at a set price before expiration.
- A call option lets you buy the underlying asset; a put option lets you sell it.
- Your maximum loss on a bought option is the premium paid, no matter what happens.
- Intrinsic value and time value set the premium, and time decay erodes it daily.
- Use options to hedge existing positions or speculate with a defined risk you can afford.
- Beyond stock contracts sit weekly expirations, long-dated LEAPS, and options on indexes, bonds, commodities, and currencies.
- Strategy spreads like the straddle and strangle trade one view of movement for a cheaper entry.
What are options?
Options are contracts giving you the right, not the obligation, to buy or sell an asset at a fixed price before a set date. You pay a premium. Your maximum loss is that premium. That is the whole game.
Each option ties to an underlying asset and is a derivative, because its value is derived from that asset's price. That small premium buys leverage: you control a big position for a fraction of the cost. Your loss stays capped at that premium, which is why savers use them.
What is a call option?
A call option gives you the right to buy the underlying asset at a fixed strike price before expiration. You use a call when you expect the price to rise. Above your strike it is worth more; below it, worthless. You get the upside without owning the asset.
What is a put option?
A put option gives you the right to sell the underlying asset at a fixed strike price before expiration. You use a put when you expect the price to fall, or to hedge a portfolio. Buying one caps the decline at a fraction of the position.
What makes an option worth its premium?
Two forces set the price: intrinsic value and time value. Intrinsic value is the gap between the strike and the current price, your realizable gain today. Moneyness sits by that gap: in the money holds intrinsic value, out of the money holds none, at the money they are level.
Time value is everything extra, the chance that the price moves your way before expiration. The longer the option has to run, the more time value it carries. It also sets your break-even: a call must clear its strike by more than the premium before you profit.
Volatility feeds that time value. The more the asset swings, the more chance it finishes in the money, so higher volatility means higher premiums. The premium quotes implied volatility, the market's forecast of how wild the asset will be. Calm assets price cheap; wild ones price dear.
The Black-Scholes model, from 1973, needs the underlying price, strike, time, and volatility. Put-call parity links a call and a put at the same strike. A binomial tree or Monte Carlo simulation handles what closed-form math cannot. They give a theoretical value; the quoted premium follows supply and demand.
What risks come with options?
Time decay is the quiet bleed: an option loses value as expiration nears even if nothing moves. Buying caps your loss at the premium, but you can lose it outright. Selling carries unlimited risk unless you own the underlying. Pin risk hits when a stock settles near the strike.
How does a contract work in practice?
One equity option contract controls 100 shares, and trades clear through the Options Clearing Corporation, so they carry little counterparty risk. Standard options expire the third Friday each month; weekly expirations close sooner. Corporate-action adjustments (stock splits, mergers) reset your strike and contract count, leaving you whole.
Exercise style sets when the right can be used. An American option lets you exercise any trading day up to expiration; a European option, only at expiration. Most stock options are American. Strike price increments are fixed, often 1, 2.5, or 5 points apart.
You can exercise your right, sell the option back to the market, or let it expire. Most traders close the position by selling before the date. Every contract sits in the options chain, the table listing each strike and expiration, where open interest counts the contracts outstanding.
What are option Greeks?
Greeks are the math that measures how an option reacts. Delta tracks how much the premium moves for each dollar the underlying asset moves. Gamma tracks how fast that delta itself shifts as the price swings.
Theta is time decay, the bleed that shrinks a premium as expiration nears even when nothing moves. Vega tracks the premium for a shift in volatility. Rho tracks interest rates, the Greek most traders barely feel.
How do you use options safely?
Start with the side that limits your risk: buying. Brokers gate each strategy by approval level, and you must pass an application before you trade; lower levels permit covered calls, higher ones open spreads and naked selling. Size the premium so a total loss never hurts your portfolio.
Use options to hedge a position you hold or bet on where price goes. A straddle buys a call and a put at one strike, betting on a big move. A strangle splits the strikes, cheaper but needing a bigger swing. Master these before complex spreads.
Writing options flips the deal: you collect the premium as income. Sell a covered call against stock you already own and you keep that premium if the price stays below your strike. A cash-secured put pays you to wait to buy. Never sell what you cannot afford to own.
What other kinds of options exist?
Not every option is a plain stock contract. Index options settle on a whole index, priced in cash rather than shares. Bond options track interest rates, commodity options oil and grain, currency options exchange rates, and future options a futures contract. Each underlying prices its own way.
Employee stock options come from an employer, carry no secondary market, and must be exercised or lapse. Over-the-counter options skip the exchange, negotiated privately. Exotic options bend the standard terms, adding barriers or all-or-nothing payoffs. Cash settlement pays the difference instead of delivering shares.
LEAPS (long-term options) run up to three years on a stock. The extra time costs more premium, but it slows decay and gives your thesis room to unfold. Traders reach for them where a one-year contract expires too soon.