Options are derivative contracts that can be used to gain exposure to an underlying asset or to hedge a position. They can be complex, and leverage, expiry and market volatility can lead to substantial losses. This guide introduces the basic terms and common approaches; it does not recommend a trade or strategy.
Key points
- An option gives its holder a right, not an obligation, to buy or sell an underlying asset under specified terms.
- Strike price, expiry date and premium are key contract terms.
- Options may be used for directional exposure, hedging or income strategies, but the risk differs by position.
- Time decay, volatility, leverage, complexity and liquidity can all affect results.
- Examples below are simplified illustrations and omit contract-specific terms, fees and taxes.
What is an option?
An option is a contract that gives its holder the right, but not the obligation, to buy or sell an underlying asset at a specified strike price within a specified period. The buyer pays a premium to the seller for that right. If the holder does not exercise an option before expiry, it may expire with no value.
Terms to understand
- Underlying asset: the asset or reference value covered by the contract, such as a share, index, commodity or currency.
- Strike price: the price at which the holder may buy or sell under the contract.
- Expiration date: the date on which the option expires, subject to the contract’s rules.
- Premium: the price paid by the buyer to acquire the option.
Calls and puts
Call option
A call gives its holder the right to buy the underlying asset at the strike price. Buyers commonly use calls when they expect the asset’s price to rise. In the source’s simplified example, a call on ABC has a 100-baht strike, three months to expiry and a 5-baht premium. If ABC is at 120 baht at expiry, the difference from the strike is 20 baht; after subtracting the 5-baht premium, the example shows 15 baht before transaction costs and contract-specific details. If the price is at or below 100 baht, the buyer could let the option expire and lose the premium paid.
Put option
A put gives its holder the right to sell the underlying asset at the strike price. Buyers may use puts when they expect a decline or to hedge shares they already own. The source’s simplified example assumes XYZ shares are at 100 baht, with a put struck at 95 baht, three months to expiry and a 3-baht premium. If the share price falls to 80 baht, the difference between the strike and market price is 15 baht; after subtracting the premium, the example shows 12 baht before costs and contract terms. If the price does not fall below the strike, the buyer may lose the premium.
These examples leave out contract multipliers, settlement rules, fees and taxes. Actual option payoffs depend on the specific contract and the position held.
Why investors use options
- Leverage: an option can provide exposure to an underlying asset for a premium lower than the cost of buying the asset directly. This can magnify gains and losses; it does not make the trade safer.
- Hedging: a put may help limit some downside exposure on shares held, while a call may be used to manage the risk of a future purchase. The hedge has a cost and may not fully offset a loss.
- Income strategies: a covered call involves selling a call against shares already held in order to receive a premium. The premium does not remove the risks of owning the shares, and the strategy may limit gains if the share price rises above the strike.
Learning options as a beginner
- Study calls, puts, strike price, expiry, premium and the factors that affect option prices.
- Understand the possible losses before placing a trade.
- Begin by learning simple strategies, such as buying a call or put; a covered call has different obligations and risks.
- Use only a small amount you can afford to lose while learning.
- Practise with paper trading or a demo account before risking money.
Common strategy types
- Directional strategies: buying a call to express a view that prices may rise, or buying a put to express a view that prices may fall.
- Income strategy: a covered call sells a call against shares already owned. The premium is received, while potential upside may be capped at the strike.
- Hedging strategy: a protective put buys a put against shares held. It has a premium cost and may limit some downside under the contract’s terms.
- Spread and multi-leg strategies: vertical spreads, iron condors, straddles and strangles combine options to create different payoff profiles. They are more complex; the maximum loss and gain depend on the exact legs, contract and market conditions.
Risks to understand
- Time decay (Theta): an option’s time value can decline as expiry approaches, even if the underlying price does not move.
- Implied volatility (Vega): changes in expected volatility can affect the premium. All else being equal, higher implied volatility often raises option prices and lower implied volatility may reduce them.
- Leverage: a relatively small premium can control a larger notional exposure, which can make losses large relative to the amount paid.
- Complexity: strike, expiry, implied volatility and the Greeks (Delta, Gamma, Theta, Vega and Rho) can affect price and risk.
- Liquidity: a thinly traded option may have a wide bid–ask spread or may be difficult to trade at the desired price.
Planning and discipline
There is no single strategy for every market condition. The source gives long calls or bull call spreads as examples for a rising market, long puts or bear put spreads for a falling market, and premium-selling strategies such as covered calls or iron condors for range-bound conditions. These are educational examples, not recommendations; each strategy has specific risks and may perform differently from the expectation.
A trading plan should identify the position, possible loss, exit conditions and the role of the option in the wider portfolio. Emotional discipline and ongoing learning matter, but they cannot guarantee a successful trade.
Frequently asked questions
What is options trading, and who might use it?
Options trading involves contracts that give the holder the right, but not the obligation, to buy or sell an underlying asset at a stated price within a stated period. Investors may use options to seek exposure or hedge, but they need to understand the risks.
Is options trading high risk?
It can be. Leverage and the time remaining before expiry affect an option’s value. A buyer may lose the entire premium paid if the option expires worthless; the risks of selling options depend on the position and contract.
How can a beginner learn about options?
Start with the contract terms and risks, practise with a simulated account, learn how a risk-management plan works, and use only a small amount that you can afford to lose.
What is the difference between a call and a put?
A call gives its holder the right to buy the underlying asset at the strike price. A put gives its holder the right to sell it at the strike price. Buyers often use calls when they expect a price rise and puts when they expect a decline, though the outcome also depends on premium, timing and other factors.
How much capital is needed to start trading options?
The amount depends on the broker and the type of option. The Thai source mentions that some products may be accessible from a few thousand baht, but this is not a universal minimum and has not been verified for current products. Check the provider’s current requirements and risk disclosures; only use money you can afford to lose.
For a discussion about personal finances, the source article links to its LINE contact.
