If you are new to options trading, the first thing you need to understand is the options contract itself — what it is, what it contains, and how it behaves. Everything else in options trading flows from this foundation.
An options contract is a financial agreement that gives the buyer the right — but not the obligation — to buy or sell a specific stock at a predetermined price before a set expiration date. That single sentence contains a lot. This guide unpacks every part of it, walks through real examples, and shows you exactly how options contracts work in practice before you place your first trade.
Quick Answer
An options contract is a derivative instrument that gives the buyer the right — but not the obligation — to buy or sell 100 shares of an underlying stock at a specific price (the strike price) before a specific date (the expiration date).
Key facts about every options contract:
- Controls 100 shares of the underlying stock
- Has a fixed strike price and expiration date
- Costs a premium — the price you pay to buy the contract
- Comes in two types: calls (right to buy) and puts (right to sell)
- Can be bought or sold (written) — both sides of the trade exist
What Is an Options Contract?
An options contract is a legally binding agreement between two parties — a buyer and a seller — that defines a specific right tied to an underlying stock’s price.
The buyer of the contract pays a premium to acquire that right. The seller of the contract collects the premium and takes on the corresponding obligation.
Here is the core asymmetry that makes options unique:
- The buyer has the right but not the obligation to act
- The seller has the obligation to fulfill the contract if the buyer exercises it
This asymmetry is why buyers can only lose their premium, while sellers take on more open-ended risk — unless they are covered (meaning they own the underlying shares).
What one contract controls: Most standard equity options contracts represent 100 shares of the underlying stock. This is not negotiable — it is a fixed specification of the contract. When you buy one call option on Apple at a $4.00 premium, your total cost is $400 ($4.00 × 100 shares).
This 100-share multiplier is also why options provide leverage. Instead of spending $18,000 to buy 100 shares of a $180 stock, you might spend $400 on a call option that gives you exposure to the same 100 shares.
The Two Types of Options Contracts
Every options contract is either a call or a put. Understanding both is essential before trading either.
Call Options
A call option gives the buyer the right to buy 100 shares of the underlying stock at the strike price before expiration.
Call buyers profit when the stock price rises above the strike price. The further above the strike the stock moves, the more valuable the call becomes.
Example:
- Stock: Nvidia (NVDA)
- Current price: $850
- Call strike price: $880
- Expiration: 30 days
- Premium: $6.00 ($600 total per contract)
If Nvidia rises to $920 before expiration, the call has $40 of intrinsic value ($920 − $880). The contract is now worth at least $4,000 — compared to the $600 paid. That is the leverage options provide.
If Nvidia stays below $880, the option expires worthless and the buyer loses the $600 premium.
Who uses calls:
- Traders expecting a stock to rise
- Investors wanting leveraged upside exposure
- Income traders selling calls against shares they own (covered calls)
Put Options
A put option gives the buyer the right to sell 100 shares of the underlying stock at the strike price before expiration.
Put buyers profit when the stock price falls below the strike price. The further below the strike the stock drops, the more valuable the put becomes.
Example:
- Stock: Tesla (TSLA)
- Current price: $200
- Put strike price: $185
- Expiration: 30 days
- Premium: $5.50 ($550 total per contract)
If Tesla drops to $160, the put has $25 of intrinsic value ($185 − $160). The contract is now worth at least $2,500 — compared to the $550 paid.
If Tesla stays above $185, the option expires worthless and the buyer loses the $550 premium.
Who uses puts:
- Traders expecting a stock to fall
- Investors hedging existing stock positions against downside
- Portfolio managers protecting against broad market declines
The Four Key Components of Every Options Contract
Every options contract — call or put — is defined by four specific terms. Before placing any trade, you need to understand all four.
1. The Underlying Stock
The underlying is the stock (or ETF) the contract is based on. Options derive their value from price movement in the underlying asset. Popular underlyings include Apple, Nvidia, Tesla, Amazon, and SPY (the S&P 500 ETF).
The characteristics of the underlying matter: highly liquid stocks with active options markets have tighter bid-ask spreads and more strike prices to choose from. Thinly traded stocks may have illiquid options with wide spreads.
2. The Strike Price
The strike price — also called the exercise price — is the specific price at which the option can be exercised.
For calls: the strike is the price at which you can buy the shares. For puts: the strike is the price at which you can sell the shares.
Strike prices are listed at regular intervals on the options chain — typically $1, $2.50, $5, or $10 apart depending on the stock’s price range. Each strike represents a different contract with different pricing, probability, and risk characteristics.
For a deep dive into how to select the right strike, see our guide: How to Pick the Right Strike Price in Options Trading.
3. The Expiration Date
Every options contract has a fixed expiration date — the last day the contract can be exercised or traded. After that date, the contract ceases to exist.
Common expiration structures:
- Weekly options — expire every Friday
- Monthly options — expire on the third Friday of the month
- Quarterly options — expire at the end of each quarter
- LEAPS — long-term options that expire one to three years in the future
The time remaining until expiration directly affects an option’s value. Contracts with more time cost more because there is more opportunity for the stock to move in the desired direction. As expiration approaches, options lose value through time decay (theta).
For a full explanation of what happens at expiration, see: What Happens When a Call Option Expires?
4. The Premium
The premium is the price you pay to buy the options contract. It is quoted per share — so a premium of $3.50 on a standard contract costs $350 total ($3.50 × 100 shares).
For the buyer, the premium is the maximum possible loss on the trade. No matter what happens, you cannot lose more than what you paid.
For the seller, the premium collected is the maximum possible profit. The seller keeps the full premium if the option expires worthless.
Premium is determined by several factors:
- Intrinsic value — how far in the money the option currently is
- Time value — how much time remains before expiration
- Implied volatility — the market’s expectation of future price movement
Intrinsic Value vs. Extrinsic Value
Every option’s premium is composed of two parts that are worth understanding separately.
Intrinsic value is the real, immediate value of an option — the amount by which it is currently in the money.
- A call with a $100 strike on a $115 stock has $15 of intrinsic value
- A put with a $90 strike on a $75 stock has $15 of intrinsic value
- Any option that is out of the money has zero intrinsic value
Extrinsic value (also called time value) is everything else — the premium above intrinsic value that reflects time remaining and implied volatility.
- An at-the-money call priced at $4.00 with no intrinsic value has $4.00 of pure extrinsic value
- A $15 intrinsic value call priced at $17.50 has $2.50 of extrinsic value
Extrinsic value decays to zero by expiration. This is why time works against buyers and for sellers. An option seller collecting $4.00 in premium is collecting $4.00 of extrinsic value that will erode to zero if the stock stays put.
This decay is the engine behind income strategies like covered calls — the seller collects extrinsic value and watches it decay in their favor.
Buying vs. Selling Options Contracts
Most beginners start by buying options. But every contract has two sides, and understanding the seller’s perspective is just as important — especially for income-focused traders.
Buying an Options Contract
When you buy a call or put, you pay the premium upfront. Your rights:
- You can exercise the option (buy or sell 100 shares at the strike price)
- You can sell the contract on the open market before expiration
- You can let it expire worthless if it never becomes profitable
Maximum loss: the premium paid. Maximum gain: theoretically unlimited for calls (as the stock can rise indefinitely), or substantial for puts (as the stock can fall to zero).
Selling (Writing) an Options Contract
When you sell an option, you collect the premium upfront. Your obligations:
- If the buyer exercises, you must fulfill the contract terms
- For a call: you must sell 100 shares at the strike price
- For a put: you must buy 100 shares at the strike price
Covered calls — selling calls against shares you already own — are one of the most common income strategies and the core focus at Gainsumo. The seller collects premium and is obligated to sell shares at the strike price if the stock rises above it by expiration.
Maximum profit: the premium collected. Risk: depends on whether the position is covered or naked.
💡 Tastytrade is purpose-built for options sellers and income traders. The platform makes it straightforward to sell covered calls, track your premium income, and manage positions at expiration. Webull is a strong starting point for beginners learning to buy and sell options with commission-free execution.
American vs. European Style Contracts
One distinction that often surprises beginners is the difference between American and European style options.
American style options can be exercised at any time before expiration — not just on the expiration date. Most stock options traded in the US are American style.
European style options can only be exercised on the expiration date itself. Most index options (like SPX, based on the S&P 500) are European style.
For most beginner traders dealing with stock options on platforms like Webull or Tastytrade, you are trading American style contracts. This means you can close or exercise your position any time the market is open before expiration.
How Options Contracts Gain and Lose Value
An options contract’s price changes constantly as three main forces shift:
Stock Price Movement
The most direct driver. Call options gain value when the underlying stock rises. Put options gain value when it falls. A $1 move in the stock does not translate to a $1 move in the option — the relationship is determined by delta, one of the Greeks.
Time Decay (Theta)
Every day that passes erodes an option’s extrinsic value. This decay accelerates sharply in the final weeks before expiration. A contract with 60 days remaining loses value more slowly per day than an identical contract with 7 days remaining.
Time decay benefits sellers and hurts buyers. This is why many experienced traders prefer selling options for income rather than buying them.
Implied Volatility (IV)
When the market expects larger future price swings — around earnings, major news events, or macro uncertainty — implied volatility rises and option premiums expand. When IV falls (often called an “IV crush” after earnings), option premiums can collapse even if the stock moved in the right direction.
Buyers want to buy when IV is low. Sellers prefer to sell when IV is high. For a deeper look at this dynamic, see our guide on implied volatility in options trading.
A Complete Worked Example
Here is a full options contract trade from entry to outcome across three scenarios.
Setup:
- Stock: Apple (AAPL) trading at $180
- Contract: Call option, $190 strike
- Expiration: 45 days
- Premium: $4.00 ($400 total per contract)
- Maximum loss: $400 (the premium paid)
Scenario 1 — Stock rises to $210 The call is $20 in the money ($210 − $190). Intrinsic value: $20.00. Contract value: at least $2,000. Profit: $2,000 − $400 = $1,600 on a $400 investment.
Scenario 2 — Stock rises to $193 The call is $3 in the money. Intrinsic value: $3.00. Contract value: approximately $300–$380 (intrinsic + remaining time value). The trade is roughly break-even to a small loss, depending on time remaining.
Scenario 3 — Stock stays at $180 or falls The call expires out of the money. Contract value: $0. Loss: $400 — the full premium paid. This is the maximum loss regardless of how far the stock falls.
Options Contracts vs. Owning Stock
| Owning Stock | Options Contract | |
|---|---|---|
| Capital required | Full share price × shares | Premium only |
| Upside | Unlimited | Unlimited (calls) |
| Maximum loss | Full investment | Premium paid (buyers) |
| Time limit | None — hold indefinitely | Fixed expiration date |
| Income potential | Dividends | Premium from selling |
| Complexity | Low | Moderate to high |
The key tradeoff: options provide leverage and flexibility but introduce time decay and expiration risk that stock ownership does not have. Many traders use both — owning shares for long-term appreciation while selling covered calls against them for income.
Frequently Asked Questions
How many shares does one options contract control?
Standard equity options contracts control 100 shares of the underlying stock. This is fixed — it does not vary by stock price or broker.
What is the maximum you can lose buying an options contract?
The maximum loss for an options buyer is the premium paid. If you buy a contract for $400 and it expires worthless, you lose $400 — nothing more.
Do you have to exercise an options contract? No. The buyer has the right but not the obligation to exercise. Most options traders never exercise — they sell the contract on the open market before expiration to capture profit or cut a loss.
What happens if you do nothing with an options contract?
If the contract is in the money at expiration, most brokers will automatically exercise it. If it is out of the money, it expires worthless. Always check your broker’s specific auto-exercise policy.
Can you sell an options contract you bought before expiration? Yes — and most traders do. You can sell your contract on the open market any time during regular trading hours before expiration.
What is the difference between a call and a put?
A call gives you the right to buy shares at the strike price. A put gives you the right to sell shares at the strike price. Calls profit when stocks rise; puts profit when stocks fall.
How do options differ from futures contracts?
Options give you the right but not the obligation to act. Futures contracts obligate both parties to complete the transaction regardless of price. Options have more flexible risk profiles for this reason.
What does it mean to write an options contract?
Writing means selling an options contract. The writer collects the premium and takes on the obligation to fulfill the contract if the buyer exercises it.
Final Thoughts
The options contract is the atomic unit of everything in options trading. Before you can evaluate a strategy, read an options chain, or understand why a position gained or lost value, you need a clear model of what a contract actually is and how its four components — underlying, strike, expiration, and premium — interact.
The most important things to carry forward: every contract controls 100 shares, the buyer pays premium for a right while the seller collects premium for an obligation, time works against buyers and for sellers, and the maximum loss for any buyer is always capped at the premium paid.
Once these mechanics are clear, every strategy — from basic call buying to covered calls to spreads — becomes much easier to understand and evaluate.
Ready to start trading options contracts?
Webull offers commission-free options trading with a clean interface that is well-suited for beginners learning the mechanics. When you are ready to focus on income strategies like covered calls, Tastytrade provides the tools, education, and platform that serious options income traders rely on.
Gainsumo is a content and education platform. This article is for informational purposes only and does not constitute financial advice. Options trading involves substantial risk of loss.
