OPTIONS TRADING

A call option is a contract between two parties. The buyer (long call) gets the right to buy a stock at a set price before a certain date, but is not required to do so. The seller (short call) agrees to sell the stock at that price if the buyer exercises the option.

Call options are used to gain exposure to rising stock prices. The buyer's maximum risk is limited to the premium paid, while the seller takes on the obligation to deliver the stock under the contract's terms. Understanding the strike price, premium, and possible payoff helps explain how call options work in Canada.

Note that this content is educational only and does not constitute financial or investment advice. Review individual circumstances and consult a professional if needed.

What is a Call Option?

A call option is a financial contract that gives one party the right, but not the obligation, to buy a specific stock or other asset at a set price within a defined period. The party that holds this right is in a long call position. The other party, known as the writer, takes a short call position and is required to sell the asset at the agreed price if the option is exercised.

There are two distinct roles in a call option, each with different mechanics and risks:

• Holder (buyer/long call): The holder pays the premium for the right to buy the underlying asset at the strike price. If the option expires worthless, the holder's maximum loss is limited to the premium paid.
• Writer (seller/short call): The writer receives the premium upfront and grants the buyer the right to exercise the option. If the option is exercised, the writer is required to sell the underlying asset at the strike price. Risks vary by structure: Covered calls limit exposure, while uncovered (naked) calls carry theoretically unlimited risk if the asset's price rises sharply.

Each call option contract includes several standard details:

• Underlying asset: The stock or security the option relates to. This applies to both long and short calls.
• Strike price: The price at which the asset may be purchased. For a long call, it's the price the holder could buy the asset. For a short call, it's the price the writer is obligated to sell if exercised.
• Expiration date: The last day the option could be exercised. For long calls, it's the deadline to use the right; for short calls, it's the deadline for the obligation to potentially be fulfilled.
• Premium: The price paid by the buyer (long call) and received by the seller (short call).
• Contract multiplier: The number of shares controlled per contract, typically 100. This applies equally to both sides.

Call options let investors benefit from price movements without owning the stock. While Canadian options are standardized, risks–especially for short calls–could increase when considering factors like price sensitivity, liquidity, and settlement timing.

How Call Options Work

Call options derive their value from the underlying asset and the specific terms of the contract. Understanding these key concepts helps explain how these contracts function in the market.

Moneyness refers to whether a call option is in the money, at the money, or out of the money. ITM calls have a stock price above the strike, ATM calls are roughly equal to the strike, and OTM calls are below the strike.

Call Option Value Components

• Intrinsic value: The portion of the call's price that reflects how far ITM it is. For example, a $50 strike call with the stock at $55 has $5 intrinsic value.
• Time value: The remaining portion of the premium representing potential for future gain before expiration. For example, if the call costs $7, the time value is $2 ($7 minus $5).

Factors Influencing Call Prices

• Underlying stock price: For a long call, higher stock prices generally increase the option's value. For a short call, lower stock prices are favourable, as the writer's obligation decreases.
• Time to expiration: More time until expiration gives a long call more chance to become profitable, while a short call carries more risk the longer the contract is open.
• Volatility: Greater price swings increase potential gains for a long call and raise the option's value, while they increase for a short call, as large moves could lead to higher potential losses.

Exercise vs. Assignment

• Exercise: When the holder uses the right to buy the underlying asset at the strike price. For example, exercising a $50 call when the stock is $55.
• Assignment: When the writer is required to fulfill the contract because the holder exercised. For example, the writer must sell the stock at $50.

Call options combine these elements to create a contract that reflects both current value and future potential. Moneyness, intrinsic value, and time value determine the premium, while assignment and exercise define the operational flow when an option is acted upon.

Key Terms for Call Options

• Strike price: The predetermined price at which the underlying asset could be bought if the call is exercised.
• Expiration date: The final day the call option could be exercised.
• Premium: The price paid to purchase the call option.
• Contract multiplier: The number of underlying shares controlled by one contract, usually 100.
• In the money (ITM): A call is ITM when the stock price is above the strike price.
• At the money (ATM): A call is ATM when the stock price is roughly equal to the strike price.
• Out of the money (OTM): A call is OTM when the stock price is below the strike price.
• Intrinsic value (call): The portion of a call's premium that reflects how far ITM it is.
• Time value: The part of the premium representing potential for future gains before expiration.
• Bid/ask: The highest price a buyer is willing to pay (bid) and the lowest price a seller is willing to accept (ask).
• Spread: The difference between the bid and ask prices.
• Open interest: The total number of outstanding contracts that have not been exercised, closed, or expired.
• Volume: The number of contracts traded during a specific period.
• Implied volatility: The market's expectation of future price fluctuations of the underlying asset.
• Delta: Measures the sensitivity of the call option's price to changes in the underlying stock's price.
• Gamma: Measures the rate of change of delta as the underlying stock price changes.
• Theta: Represents the effect of time decay on the call option's price.
• Vega: Measures sensitivity to changes in implied volatility.
• Assignment: Occurs when the writer must fulfill the contract because the holder exercised the option.
• Exercise: When the holder uses the right to buy the underlying asset at the strike price.
• Options chain (calls panel): A table showing available call contracts with their strike prices, premiums, expirations, and other key data.

Call Option Example

This section provides an illustrative example of the mechanics of a call option.

Long Call at Expiration–Payoff Table

Understanding the Table

• When the stock is below the strike price, the call is OTM and expires worthless. Loss is limited to the premium paid.
• ATM means the intrinsic value is zero, but the option might still retain time value before expiration in other scenarios.
• Once the stock rises above the strike, the option is ITM. Intrinsic value contributes to potential gains, eventually exceeding the premium cost.
• The breakeven threshold occurs where the intrinsic value equals the premium. Beyond this point, the position produces net profit.
• The table illustrates how the payoff grows with the stock price, demonstrating leverage and risk exposure at different moneyness levels.

This example is for illustration only. For more detailed numeric scenarios and varying strike/expiration combinations, see the full call option examples page.

Where Calls Appear on an Options Chain

Options chains display available contracts for a given underlying asset, typically divided into call and put panels. The strike price column is usually centred between the two panels to show calls on one side and puts on the other, making comparison easier.

Call Panel Layout

• Strike price: Shows the exercise price for each option; aligns between calls and puts.
• Bid: The highest price a buyer is willing to pay for the call.
• Ask: The lowest price a seller is willing to accept.
• Last: Most recent trade price for the call option.
• Volume: Number of contracts traded during the current session.
• Open interest: Total number of outstanding contracts not yet exercised, closed, or expired.

Expiry Selector

• Allows viewing contracts grouped by expiration date.
• Switch between weekly, monthly, or quarterly expiries depending on availability.

Strikes and Maturities

• Options are typically grouped in strike intervals (e.g., $1, $2.50, or $5 increments).
• Viewing different maturities provides perspective on near-term vs. longer-term contracts.
• Filters might allow sorting by price, moneyness, or volume.

Navigation Notes

• The calls panel is displayed alongside the puts panel for easy reference.
• Strike prices remain the central reference point across panels, providing a clear view of potential payoffs.

How to Buy a Call Option

Buying a call option involves selecting a contract on an options chain and submitting an order with the desired parameters. The process could be summarized in the following steps:

1. Locate the options chain: Access the options chain for the underlying asset of interest. This table lists available call and put contracts, organized by strike price and expiration date.
2. Select expiry and strike: Choose the desired expiration date and strike price that aligns with the intended trade. Ensure the call option type is selected.
3. Set quantity: Determine the number of contracts to purchase. Each contract typically represents a standardized number of shares (commonly 100).
4. Choose order type: Select the type of order, such as market or limit, depending on how quickly execution is desired and the preferred price.
5. Confirm details: Review all order details before submission, including underlying, strike, expiration, quantity, and order type.
6. Submit order: Send the order to the market for execution.

Notes:

• Orders might be filled, partially filled, or cancelled depending on market conditions.
• It is important to monitor order status in the order blotter or activity panel to track execution and confirm completion.

Understanding Price Drivers for Calls

The price of a call option is influenced by several key factors that affect its value in the market. Understanding these drivers helps clarify how premiums are determined and how options behave under different conditions.

• Underlying price: Call options gain value when the underlying asset's price rises. There is a direct relationship between the stock price and call value, as higher stock prices increase the intrinsic value of ITM calls.
• Time to expiry and theta (time decay): The more time until expiration, the greater the potential for the option to become profitable. As expiration approaches, the option's time value diminishes (captured by theta), which represents the rate of value erosion due to the passage of time.
• Volatility and vega: Volatility measures the expected fluctuation in the underlying asset's price. Higher volatility generally increases the potential for the option to move ITM, raising the premium. Vega represents the sensitivity of the option's price to changes in implied volatility. This is a conceptual measure and does not predict future movements.
• Liquidity and bid/ask spreads: The difference between the highest bid and lowest ask affects how efficiently a call option could be bought or sold. Narrower spreads and higher open interest or trading volume usually indicate better liquidity, reducing the potential impact of slippage when entering or exiting positions.

These factors combine to determine the market price of a call option at any given moment. Each driver affects value independently, while also interacting with the others to shape premiums and potential payoff outcomes.

Risks and Operational Considerations

Call options involve several operational and market-related considerations that could affect outcomes. Understanding these factors helps clarify the nature of potential risk for call options.

• Capital risk: If the underlying asset's price does not rise above the strike price before expiration, the option will expire worthless, resulting in a 100% loss of the initial capital (premium) invested.
• Time decay risk: The value of a call option diminishes as it approaches expiration due to the loss of time value. This process, often referred to as theta decay, is a natural characteristic of options and affects holders by reducing potential profitability over time.
• Event and gap risk: Sudden price movements caused by earnings announcements, economic releases, or other events could create gaps in the underlying asset's price. These gaps might impact call option value and execution, particularly for options that are near the money or lightly traded.
• Liquidity and spread considerations: Narrow bid/ask spreads and higher trading volume generally improve execution efficiency. Illiquid options with wide spreads could result in slippage, where orders are filled at prices less favourable than expected.
• Early assignment risk: For American-style options, writers might be assigned before expiration. This operational feature means the seller could be required to deliver the underlying asset if the holder chooses to exercise early. This is a normal aspect of the contract structure, not a prediction of occurrence.
• Corporate action adjustments: Events like stock splits, dividends, or mergers might lead to adjustments in strike prices, contract size, or other terms. These adjustments maintain contract equivalence but could affect valuation or exercise considerations.