An option gives its holder a contractual right to buy or sell an underlying exposure while the writer accepts the corresponding obligation.
An option is a derivative contract that gives the holder a right, but not an obligation, to buy or sell an underlying asset or settle a value under specified terms. The option writer receives a premium and accepts the corresponding obligation if the contract is exercised or assigned.
Options can create defined-risk exposure for a buyer, transfer risk between market participants, or change the payoff of an existing position. They are also leveraged and time-limited contracts whose outcome depends on more than whether the underlying asset rises or falls.
| Term | What it controls |
|---|---|
| Underlying | Asset, rate, index, futures contract, or other reference |
| Option type | Call or put |
| Strike price | Price or level used to determine exercise or settlement |
| Expiration | When the option right ends |
| Exercise style | When exercise is permitted |
| Multiplier or notional | Converts a quoted option price or payoff into contract exposure |
| Deliverable | Asset, quantity, cash amount, or other property due after exercise |
| Settlement | Physical delivery, cash settlement, or another stated result |
| Premium | Market price paid by the buyer and received by the writer |
An option agreement is the legal documentation governing rights and obligations. An option contract is the specific position created under those terms. The agreement, trade confirmation, exchange specifications, clearing rules, and adjustment notices control the actual outcome.
A standard U.S. equity option normally covers 100 shares, but that convention must not be assumed for every product. Index options, futures options, employee options, over-the-counter contracts, and adjusted listed contracts can use different multipliers, notionals, settlement values, or deliverables.
| Position | Contract exposure | Initial cash flow | Basic directional effect |
|---|---|---|---|
| Long call | Right to buy or receive a positive call settlement | Pays premium | Benefits from sufficient upside |
| Long put | Right to sell or receive a positive put settlement | Pays premium | Benefits from sufficient downside |
| Short call | Obligation to sell or settle if assigned | Receives premium | Hurt by sufficient upside |
| Short put | Obligation to buy or settle if assigned | Receives premium | Hurt by sufficient downside |
The holder can generally sell an open listed option rather than exercise it, subject to liquidity and trading rules. The writer can generally buy the same series to close, but assignment can occur before that closing trade is completed when the contract permits early exercise.
The long and short sides have opposite contractual payoffs, but their total economic results may not be exact opposites after commissions, bid-ask spreads, financing, taxes, margin costs, stock borrow, dividends, or separate hedges.
For a simple option on an underlying with expiration price (S_T) and strike (K), the holder’s payoff per unit at expiration is:
If the premium per unit is (p), simplified net profit at expiration before transaction costs is:
The writer’s corresponding simplified result is premium received minus the option payoff. For a standard contract, multiply the per-unit result by the contract multiplier and the number of contracts.
These formulas describe expiration value. Before expiration, an option can trade above intrinsic value because time and uncertainty remain. Physical settlement, cash settlement, dividends, financing, and contract adjustments can also affect the full economic result.
Assume a stock trades at $52 and a three-month $50 call costs $4 per share. If one standard equity contract covers 100 shares, the premium outlay is $400, excluding fees.
| Stock price at expiration | Call intrinsic value per share | Simplified result per share | Result for one 100-share contract |
|---|---|---|---|
$45 | $0 | -$4 | -$400 |
$50 | $0 | -$4 | -$400 |
$53 | $3 | -$1 | -$100 |
$54 | $4 | $0 | $0 |
$58 | $8 | $4 | $400 |
At $53, the call is in the money by $3, yet the buyer still has a $1 per-share loss because the $4 premium has not been recovered. The simplified expiration breakeven is $54, equal to the $50 strike plus the $4 premium.
Before expiration, $54 is not a universal breakeven trigger. The option may still contain extrinsic value, and the position can be closed at the available market price rather than held to expiration.
| Concept | What it measures | What it omits |
|---|---|---|
| Moneyness | Relationship between underlying price and strike | Premium paid, costs, and earlier price changes |
| Intrinsic value | Immediate exercise value under the stated convention | Remaining extrinsic value and total trade cost |
| Option premium | Current traded or quoted option price | Whether the eventual trade will be profitable |
| Expiration payoff | Contract value at expiration before premium | Entry cost and transaction expenses |
| Profit or loss | Change in economic value after relevant costs | May depend on the chosen valuation date and accounting treatment |
A call is in the money when the underlying price is above the strike. A put is in the money when the underlying price is below the strike. An in-the-money option can still produce a net loss for its buyer, while a position closed before expiration can be profitable without ever being exercised.
An option premium can be viewed as intrinsic value plus extrinsic value:
Important value drivers include:
Option Greeks summarize selected local sensitivities, but they are model-dependent estimates rather than guarantees. Delta can change as price moves, theta is not always a constant daily loss, and implied volatility can move at the same time as the underlying.
Exercise style is a contract term:
These labels do not identify where the option trades. Product specifications must be checked because equity, index, futures, and OTC options can have different settlement and exercise terms.
Early exercise is not automatically beneficial. Exercising can surrender remaining extrinsic value that might be captured by selling the option instead, if a sufficiently liquid market exists. Dividends, borrowing costs, stock-loan conditions, interest rates, taxes, and operational constraints can affect that comparison.
Exercise does not always mean shares change hands.
| Settlement type | General result | Main items to verify |
|---|---|---|
| Physical settlement | The stated asset or deliverable is bought or sold | Quantity, deliverable, funding, borrow, and settlement date |
| Cash settlement | A cash amount is determined from a settlement value | Calculation time, reference value, multiplier, and payment date |
Some index options use a special opening quotation or another defined settlement value rather than the last displayed index level. Futures options can result in a futures position. OTC options can contain bespoke calculation-agent, disruption-event, and close-out terms. The product specification or confirmation controls.
Broker deadlines can be earlier than clearing deadlines. Near expiration, after-hours price changes, automatic-exercise procedures, assignment uncertainty, and insufficient account capacity can produce unexpected positions or liquidation. A position shown as part of a spread does not guarantee that all legs will be exercised, assigned, or closed together.
| Feature | Exchange-listed option | Over-the-counter option |
|---|---|---|
| Terms | Standardized by product specification | Negotiated under contract documentation |
| Trading | Exchange and broker market structure | Dealer or bilateral market |
| Credit structure | Commonly cleared through a central counterparty | Can be bilateral or centrally cleared, depending on product and rules |
| Customization | Limited to listed series and approved adjustments | Can tailor strike, dates, notional, payoff, and settlement |
| Price evidence | Displayed quotes and trades may be available | Often depends on dealer quotes and valuation models |
| Main documentation | Exchange rules, clearing rules, disclosure documents | Master agreement, confirmation, collateral, and definitions |
Standardization can improve comparability, but it does not guarantee liquidity or a narrow spread. Customization can align an OTC hedge with a specific exposure, but it can add counterparty, documentation, valuation, collateral, and close-out complexity.
Corporate actions can change an option’s deliverable or other terms. Stock splits, mergers, special distributions, reorganizations, and similar events may produce an adjusted series that no longer represents a standard share quantity.
Do not infer the deliverable from the strike alone. For a live listed contract, check the current option symbol, broker confirmation, exchange product specifications, and any OCC information memo. Adjusted and standard contracts with similar-looking strikes can have different values and liquidity.
Options do not eliminate risk; they redistribute and reshape it. A hedge can introduce basis, timing, liquidity, premium, counterparty, and operational risks.
$4 is in the money by $3 at expiration but still has a $1 per-share loss.For an actual position, use the current option chain, trade confirmation, product specifications, disclosure document, broker procedures, account requirements, and professional advice appropriate to the decision. This article is for financial education only and is not personalized investment, derivatives, legal, accounting, or tax advice.