A call spread, also known as a bull call spread, is a popular options trading strategy that lets UK retail traders speculate on asset price movements with defined risk. The strategy involves buying a call option at a lower strike price while selling one at a higher strike price.
Consider a practical example: a trader buys a call option on the FTSE 100 index at 7,000 and sells one at 7,200, both expiring in 6 weeks. This position profits if the index rises above 7,000 but stays below 7,200. The maximum profit equals the difference between strike prices minus the net premium paid (typically £150–£200 per contract, depending on market conditions).
Key Characteristics of Call Spreads
Call spreads offer several advantages that appeal to UK traders. Your maximum profit is capped at the difference between the two strike prices, while your maximum loss is limited to the net premium paid. Since both outcomes are known before you trade, this defined-risk structure suits traders who want to control their exposure to volatility.
You can trade call spreads across stocks, indices, commodities, and currencies. They work effectively in trending or ranging markets, with expiration dates ranging from one day to 12 months. This flexibility makes them a practical choice for managing risk while speculating on price movements.
Margin Requirements for Call Spreads
Margin requirements for call spreads typically range from 10% to 20% of the notional trade value, varying by broker. For a FTSE 100 spread with a notional value of £10,000, you'd need £1,000–£2,000 in available margin to open the position.
Check with your broker about specific restrictions before trading. Some firms impose minimum account sizes or trading experience requirements. Understanding margin rules, trading hours, expiration dates, and settlement procedures protects you from unexpected surprises.
Naked Calls vs Call Spreads
A naked call (uncovered call) is a call option sold without an offsetting long position or protective call spread. This strategy carries unlimited loss potential—if the underlying asset rises sharply, losses grow indefinitely. The seller must deliver the asset at the strike price if exercised, potentially triggering massive losses.
Call spreads provide better risk management. Your loss caps at the net premium paid, and your profit caps at the strike price difference. This defined risk-reward structure makes spreads far more suitable for retail traders than naked calls, especially those seeking leverage without catastrophic downside exposure.
Example of a Call Spread Trade
Imagine trading a call spread on Barclays stock, currently trading at £1.80. You buy a £1.85 call and sell a £1.95 call, both expiring in three months. Your net premium is £0.05 per share. On 1,000 contracts (representing 1,000 shares), you pay £50 total.
At expiration, if Barclays trades at £1.92, your £1.85 call is in-the-money while your £1.95 call remains out-of-the-money. You profit £0.07 per share (£1.92 minus £1.85 minus the £0.05 premium), generating £70 gross or £20 net after deducting the initial premium.
Call spreads enable you to trade various assets with different strike prices and expiration dates while maintaining strict risk controls. The strategy appeals to traders seeking defined risk, known profit potential, and reasonable leverage across diverse market conditions.