What Is a Horizontal Spread?
A horizontal spread, also known as a calendar spread or time spread, is an options strategy that involves buying and selling two options of the same type and the same strike price but with different expiry dates. The trader typically sells a shorter-dated option and buys a longer-dated one. The strategy is built around the way time value and volatility affect options as expiry approaches.
How a Horizontal Spread Works
Because the two options share a strike price but differ in expiry, the position is sensitive to the passage of time and to changes in volatility rather than to large directional moves. The shorter-dated option tends to lose time value more quickly, which can benefit the spread if the underlying price stays near the strike.
Horizontal, Vertical, and Diagonal Spreads
It helps to distinguish the main spread types, which differ by what they vary:
| Spread Type |
Strike Price |
Expiry Date |
| Horizontal (calendar) |
Same |
Different |
| Vertical |
Different |
Same |
| Diagonal |
Different |
Different |
Why Traders Use It
Horizontal spreads appeal to traders who expect the underlying price to remain relatively stable in the near term, or who want to express a view on volatility and time decay rather than direction. The defined structure also helps frame the potential outcomes of the position.
The Complexities of Calendar Spreads
Horizontal spreads are sensitive to shifts in volatility and to how the underlying price behaves relative to the strike, which makes their outcomes less intuitive than simple directional trades. A sharp move in either direction can work against the position. These strategies suit traders who understand options pricing and the way time and volatility interact.
The Role of Time in Options Trading
The horizontal spread highlights how options trading is about more than just direction, drawing on time decay and volatility as well. Understanding these dynamics helps traders appreciate why option strategies can be tailored to specific market expectations. VT Markets traders exploring derivatives can use this knowledge to interpret how time-based strategies are constructed.
Risk Warning: Trading CFDs involves significant risk and may not be suitable for all investors. Losses can exceed your initial deposit. Please ensure you fully understand the risks involved before trading.
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