Options
Definition
An option is a contract giving the buyer the right, but not the obligation, to buy or sell an underlying asset at a set price before a set date, in exchange for a premium paid to the seller.
Detailed Explanation
Every option has the same four components: an underlying asset, a strike price, an expiration date, and a premium. The premium is what the buyer pays and the seller keeps regardless of what happens next. One standard equity or ETF option contract covers 100 shares, so a premium quoted at $2.50 costs $250. That multiplier is where the leverage comes from, and it's also why options positions get large faster than people expect.
The asymmetry between buyer and seller is the whole structure. The buyer has a right and can walk away, so the most they can lose is the premium. The seller has an obligation and gets paid to accept it, so their gain is capped at the premium while their loss can run much further. That imbalance is why brokers gate options behind approval levels, and why selling uncovered contracts requires the highest level and a margin account.
Exercise style determines when that obligation can land. Standard U.S. equity and ETF options are American-style, exercisable any business day through expiration, and settled by actual delivery of shares. Major index options like SPX and VIX are European-style, exercisable only at expiration and settled in cash.
The practical consequence for anyone selling American-style contracts is that assignment can arrive on any trading day the position stays open (you don't control the timing). Options are cleared through the Options Clearing Corporation, which stands between buyer and seller so neither depends on the other's creditworthiness.
Time is the other force acting on every position. An option's premium consists of intrinsic value (how far in-the-money it currently is) and extrinsic value, which is everything else: time remaining and expected volatility. Extrinsic value decays toward zero as expiration approaches, and that decay accelerates near the end. This means an option buyer can be right about direction and still lose, because the move didn't arrive fast enough. It also means choosing the strike and expiration is a substantive decision rather than a detail.
Example
Suppose you own 100 shares of a stock trading at $50 and sell a covered call with a $55 strike expiring in 45 days, collecting $1.20 per share ($120). Three outcomes: the stock stays below $55 and you keep the $120 and the shares; it closes at $53 and you keep both, having earned $120 on shares that also gained $300; or it jumps to $65 and your shares are called away at $55, giving you $500 of stock gain plus $120 premium, but you forfeit the $1,000 you'd have had holding outright. The premium was payment for capping your upside.
The Four Basic Positions
Two contract types, two sides of each (these four are the building blocks of every strategy, including multi-leg ones).
Long call — buying the right to buy. You expect the stock to rise. Buy one $50 call on a $48 stock for a $2.00 premium ($200 total). If the stock reaches $58, the contract is worth roughly $800 intrinsic, netting about $600. If it stays below $50 through expiration, the contract expires worthless and you lose the $200 (no more). Max loss: the premium. Max gain: theoretically unlimited.
Long put — buying the right to sell. You expect the stock to fall, or you own shares and want downside protection. Buy one $45 put on a $48 stock for $1.50 ($150). If the stock drops to $38, the put is worth about $700 intrinsic, netting roughly $550. If the stock stays above $45, you lose the $150. Used as insurance on shares you own, this is a protective put. Max loss: the premium. Max gain: large but capped, since a stock can only fall to zero.
Short call — selling the obligation to deliver shares. Sell a $55 call on a $50 stock and collect $1.00 ($100). If the stock stays below $55, you keep the $100. If it runs to $70, you must deliver 100 shares at $55. Owning those shares makes this a covered call, and your cost is the upside you gave up. Not owning them makes it a naked call, where you'd buy at $70 to deliver at $55 (and there's no ceiling on how high the stock can go). Max gain: the premium. Max loss: capped opportunity cost if covered, theoretically unlimited if naked.
Short put — selling the obligation to buy shares. Sell a $45 put on a $48 stock and collect $1.50 ($150). If the stock stays above $45, you keep it. If it falls to $30, you must buy 100 shares at $45 (a $1,500 loss against the $150 collected). Traders sometimes use this deliberately to acquire shares below the current price, called a cash-secured put when the cash to buy is set aside. Max gain: the premium. Max loss: substantial, up to the strike price times 100 if the stock goes to zero.
Key Articles Related To Options
Related Terms
Call Option: A contract giving the buyer the right to purchase the underlying asset at the strike price before expiration.
Put Option: A contract giving the buyer the right to sell the underlying asset at the strike price before expiration.
Derivative: Any contract whose value is based on an underlying asset, the broader category options belong to.
Premium: The price paid by the option buyer to the seller, and the buyer's maximum possible loss.
Assignment: The obligation triggered when an option seller is required to fulfill the contract by buying or delivering shares.
FAQs
What's the difference between a call and a put?
A call gives the right to buy at the strike price; a put gives the right to sell. Buyers of calls generally expect the price to rise, buyers of puts expect it to fall or want protection on shares they already own.
How many shares does one option contract control?
One standard equity or ETF contract covers 100 shares, so quoted premiums are multiplied by 100. Corporate actions like splits and mergers can produce adjusted contracts covering a different number.
Can I lose more than I invest with options?
As a buyer, no (your loss is capped at the premium). As a seller, yes. A naked call has no theoretical cap on losses, and a short put can lose up to the strike price times 100. This asymmetry is why brokers restrict selling strategies to higher approval levels.
What does it mean when an option expires worthless?
It expired without intrinsic value (a call with the stock below the strike) or a put with the stock above it. The buyer loses the entire premium; the seller keeps it. This is a common outcome, not an unusual one.
What is a covered call?
Selling a call on shares you already own. The premium is income, and if the stock rises past the strike your shares get called away at that price. You're trading unlimited upside for a defined payment now, which makes it one of the more conservative options strategies.
Do I have to hold an option until expiration?
No, and most traders don't. Options trade on exchanges, so you can close a position by selling a contract you bought or buying back one you sold. Closing early captures remaining extrinsic value that would otherwise decay away.
Are options a good idea for beginners?
They demand more than stock investing does (you have to be right on direction, magnitude, and timing, and time decay works against buyers every day). Brokers require approval levels partly for this reason. Anyone starting out is generally better served getting a core portfolio in place before adding contracts on top.