Horizontal and Diagonal Spread Strategies
Vertical spreads involve options with identical expiration dates but different striking prices. Another variation of the spread involves simultaneous option transactions with different expiration months. This strategy is called a calendar spread, or time spread.
The calendar spread can be broken down into two specific variations:
- Horizontal spread -- in this strategy, options have identical striking prices but different expiration dates.
- Diagonal spread -- in this strategy, options have different striking prices and different expiration dates.
ExampleGoing Horizontal: You create a horizontal calendar spread.
ExampleThe Diagonal View: You create a diagonal calendar spread. You sell one March 40 call for 2, and you buy one June 45 call for 3. Your net cost is $100. This transaction has different striking prices and expiration months. If the earlier-expiring short position is exercised, the long call can be used to cover the short call. In other words, as owner of the long position, you can exercise the call when your short position call is exercised. If the earlier call is not exercised, the overall risk is restricted to the net cost of $100. After expiration of the short call, breakeven is equal to the long call's striking price plus the cost of the overall transaction. In this case, the net cost was $100, so the breakeven price (not allowing for trading costs) is $46 per share. This is illustrated in Figure below.
Giving different spread strategies the names vertical, horizontal, and diagonal helps distinguish them from one another, and makes it easier to visualize the relationships between expiration and striking prices. These distinctions are summarized in Figure below.
[caption id="attachment_12558" align="aligncenter" width="550"] Comparison of spread strategies.[/caption]
A horizontal spread is an attractive strategy when the premium value between two related options is temporarily distorted or when the later option's features cover the risks of the earlier-expiring short position.
ExampleUnlimited Risk, Horizontally Speaking: You open a horizontal spread using calls. You sell a March 40 call for 4, and you buy a June 40 call for 6. Your net cost is $200. If the market value of the underlying stock rises, the long position covers the short position. The risk is no longer unlimited. The maximum risk in this situation is the $200 paid to open the spread. If the stock remains at or below striking price, the short call will lose value and expire worthless; or it can be bought and closed at a profit. For example, if the short call's value fell to 1, you could buy and realize a profit of $300. Compared to the net cost of opening the spread, this puts you $100 ahead overall, but you still own the long call. If the premium value were to rise above the $600 paid for this call, it could be sold at a profit.
Smart Investor TipDevices like the horizontal spread sometimes come about in stages; for example, the long, later-expiring side can be opened to avoid exercise in a previously established short position.
ExampleAvoiding Exercise Horizontally: You sold a covered June 45 call last month. The stock's market value is above striking price. You do not want to close the position because that will create a loss, and you also would like to avoid exercise. By buying a September 45 call, you create a horizontal spread. If the June 45 call is exercised, you will be able to use the September 45 call to fulfill the assignment. However, if the call is not exercised, you own a later-expiring call that has its own potential for profit within a time span of an additional three months.
ExampleReduced Risk with Diagonal Strategies: You create a diagonal spread. You sell a March 50 call for 4, and you buy a June 55 call for 1. You receive $300 net for these transactions. If the stock's market value falls, you will earn a profit from the decline in premium value on the short position. If the stock's market value rises, the long position call's value rises as well, offsetting increases in the short call. Maximum risk in this situation is 5 points; however, because you received net premium of $300, the real exposure is limited to two points (five points between striking prices, less three points net premium). If the earlier, short call expires worthless, you continue to own the long call. With its later expiration, you have potential profit for three more months.
For example, it is likely that by selling short-term options against the longer-term LEAPS, the strategy can be repeated many times. Enough premium income could be generated by selling calls to offset the cost of the long-position LEAPS. As the stock price changes over time, the corresponding horizontal or diagonal differences can be adjusted as well. The result could be to maximize premium income without risking exercise. Remember, the greatest decline in time value occurs in the last quarter of an option's life span. So you maximize this strategy by timing to offset long positions: You would seek short positions with higher striking prices (for calls) or lower striking prices (for puts).
The box spread adds complexity but opens the possibility for variations on this theme. A box spread employing long-position LEAPS and a series of offsetting shorter-term option short sales enables you to modify the range as the stock's price moves in either direction.