Ratio Spread
A ratio spread buys one option and sells more than one further out, often for little or no cost. Learn how it profits, and the naked risk it carries.
A ratio spread buys one option and sells a larger number of options further out of the money, usually in a 1-by-2 ratio. Because you sell more than you buy, you often collect enough premium to enter cheaply, for free, or even for a credit. The catch is that the extra sold option is uncovered.
It is a spread with an unequal number of legs, and that imbalance is the whole story. Let me show you the reward and the hidden risk.
More Sold Than Bought
A normal vertical spread buys one option and sells one option. A ratio spread tips that balance: you buy one and sell two (or more) at a further strike.
The extra premium from that second sold option makes the trade very cheap to put on. You profit best when the stock drifts to the strike of the options you sold, where your long option has gained value and the sold options have not yet turned into a problem. But past that strike, the uncovered short option starts working against you, and that is where the danger lives.
Watch It Work
Apple is at $200 and you think it will drift up toward $210 but not blow past it. You build a call ratio spread:
- Buy one $200 call for $6 a share
- Sell two $210 calls for $3 a share each, collecting $6
- Net cost: about zero, since the two sold calls paid for the one you bought
Apple drifts up to $210 at expiration. This is the bullseye. Your $200 call is worth $10 a share, or $1,000, while both $210 calls expire worthless. You keep the full gain on the long call for almost no cost.
Apple keeps running to $240. Now the problem shows. You own one $200 call but are short two $210 calls, so above $210 you are effectively short one naked call. That uncovered call loses more the higher Apple climbs, and the loss is open-ended. A move that is too big turns a winner into a serious loser.
Respect the Naked Leg
The appeal of a ratio spread is obvious: a targeted bet you can often put on for free. The danger is just as real.
The reward is a low-cost or free position with a fat payoff if the stock lands right at the short strike.
The risk is the extra uncovered option. A call ratio spread has open-ended risk if the stock rallies too far, and a put ratio spread has large risk if it falls too far. This is not a beginner trade, and many traders define the risk by adding a further protective option, which turns it into a safer structure.
The mirror image, selling one and buying two, is a backspread, which flips the risk and reward entirely.
- A ratio spread buys one option and sells more, often 1-by-2.
- The extra premium makes it cheap, free, or a credit to enter.
- It peaks when the stock lands at the short strike.
- The uncovered short leg carries open-ended risk beyond that strike.
Pop Quiz
Three quick questions to see what stuck. Pick an answer and the explanation shows up right away.
What defines a ratio spread?
A ratio spread sells more options than it buys, which is what creates both its low cost and its naked risk.
Where does a 1-by-2 call ratio spread peak?
At the short strike the long option is deep in value and the sold options expire worthless, the sweet spot.
What is the main danger of a call ratio spread?
The extra uncovered short call means a runaway rally creates a growing, open-ended loss.
Bottom Line
A ratio spread buys one option and sells more, so the extra premium makes it cheap or even free to enter, with a fat payoff if the stock drifts right to the short strike. It is a precise, low-cost way to target a specific price.
The price of that precision is a naked short leg. Push too far past the short strike and the uncovered option opens up serious, open-ended risk. Treat it as an advanced trade, and consider adding protection to define the downside.
Keep going: the balanced version is the vertical spread, and the flipped, long-volatility mirror is the backspread.