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A diagonal spread is an options strategy that combines elements of a vertical spread and a calendar spread by buying and selling options of the same type on the same underlying asset, using different strike prices and different expiration dates. You buy a longer-dated option at one strike and sell a shorter-dated option at a different strike simultaneously. The goal is to collect premium from the short option while retaining a directional position through the longer-dated long option.
Think of it like owning a long-term ticket to ride a stock's move while repeatedly renting out a shorter-term ticket to reduce your upfront cost.
The name comes from how the position looks on an options chain. Vertical spreads use the same expiration with different strikes. Calendar spreads use the same strike with different expirations. A diagonal spread moves diagonally across both axes at once: a different strike and a different expiration date.
That diagonal structure is what gives the strategy its hybrid risk profile. It carries some of the directional characteristics of a vertical spread and some of the time decay dynamics of a calendar spread.
Every diagonal spread has a long leg and a short leg. The mechanics of each leg determine the risk and income profile of the whole position.
You can construct a diagonal spread with either calls or puts, and the direction of your strikes determines whether the trade is bullish or bearish.
A bullish diagonal call spread involves buying a longer-dated call at a lower strike and selling a shorter-dated call at a higher strike. You profit if the stock rises moderately, ideally finishing near the short call's strike at its expiration. A bearish diagonal put spread works the reverse: buying a longer-dated put at a higher strike and selling a shorter-dated put at a lower strike.
Profit comes from two sources. First, the short option loses value due to time decay and expires worthless, letting you keep the premium received. Second, your long option retains value or appreciates if the underlying moves in your direction.
After the short leg expires, you can sell another short-dated option against your still-open long option. Repeating this cycle reduces your net cost in the long option over multiple periods. This repeat-selling process is what makes diagonal spreads attractive as an income generation strategy on a directional position.
For a long diagonal spread entered for a net debit, your maximum loss is limited to the net debit paid. Your maximum profit is variable and depends on where the underlying stock trades when the short option expires. Because the long option remains open after the short expires, profit is theoretically open-ended beyond what a simple vertical spread allows.
However, profit calculations require a pricing model because you must estimate the remaining value of the long option at the short option's expiration date, which depends on implied volatility and time remaining.
Diagonal spreads carry specific risks that differ from simpler strategies. Early assignment on the short leg is possible with American-style equity options, especially before an ex-dividend date. If your short call goes deep in the money before expiration, the buyer may exercise it early, leaving you short shares. Rolling the short leg before that point is the standard risk management response.
Changes in implied volatility affect both legs differently. A spike in volatility benefits your long option more than it hurts your short option, which is generally positive. A collapse in implied volatility compresses the value of your long anchor even if the stock has moved in your direction.
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