A ratio spread buys options at one strike and sells a larger number at another. The most common version buys one and sells two. It is often cheap or even free to open, and it profits well from a moderate move in the expected direction.
It also contains a leg with no protection, and the loss arrives in a way most traders do not expect: from being too right.
How it is built
A call ratio spread, in its standard 1x2 form:
Buy one call option at a strike near the current price.
Sell two call options at a higher strike.
The two sold options bring in premium that pays for most or all of the bought option. Depending on the strikes chosen, the structure can be opened for a small cost, for nothing, or for a small credit.
A put ratio spread mirrors it: buy one put option near the current price and sell two at a lower strike. It profits from a moderate fall.
The critical detail is the count. One bought option covers one of the two sold options. The second sold option has nothing covering it. Above the sold strike in a call ratio spread, that leg behaves exactly like a naked short call option, with losses that grow as the price keeps rising.
A worked example
Suppose an index is at 24,000. Illustrative prices for options with two weeks to expiry:
Buy one 24,000 call option at 170.
Sell two 24,300 call options at 60 each, receiving 120.
Net cost: 170 − 120 = 50 points per unit. Multiply by the lot size for rupees.
At expiry, below 24,000: everything expires worthless. Loss: 50.
At expiry, at 24,300: the bought option is worth 300, the sold ones worth nothing. Profit: 300 − 50 = 250. This is the maximum.
Above 24,300, each point higher adds one point to the bought option but costs two on the sold ones, so profit falls by one point for every point the index rises.
Breakevens: 24,050 on the lower side, and 24,300 + 250 = 24,550 on the upper side.
Above 24,550, the position loses money, and the loss has no limit. At 25,000, the loss is 200 points. At 25,500, it is 700.
So the trader who expected a rise and got a large one loses money. That is the defining risk of the structure: it is designed for a moderate move to a target, and it punishes a move that overshoots the target by a wide margin.
What it is really a bet on
A ratio spread combines a directional view with a view on how far the move will go. It expresses: “the price will rise, but not by too much, by expiry.”
Because it has more options sold than bought, it also generally behaves like a short volatility position. It tends to benefit if implied volatility falls and time passes without a large move, and it suffers when volatility rises sharply — which often happens during exactly the large, fast move that produces the unlimited loss.
The inverse structure, the backspread, sells one option and buys two further away. It benefits from a large move and loses a limited amount if the price moves modestly. Traders sometimes confuse the two; they are opposite bets.
Margin reflects the naked leg. Because one sold option is uncovered, the margin required is closer to that of a naked short option than to a defined-risk spread. The low opening cost does not mean low capital requirement.
Strike choice shifts the balance. Moving the sold strike closer to the bought one brings in more premium, often turning the position into a credit, but lowers the maximum profit and brings the upper breakeven closer — the unlimited zone starts sooner. Moving it further away gives more room before the tail begins, but costs more to open and needs a larger move to reach full profit. There is no free version; each choice trades room against cost.
Managing it, and closing the tail
Buy a wing. The most direct fix is to buy one further call option above the sold strike — for example at 24,600 in the example. That covers the naked leg and caps the upside loss. The structure becomes a broken-wing butterfly: defined risk on both sides, lower maximum profit, a small extra cost. For most retail traders, this is the version worth considering.
Decide an exit before the move. If the price approaches the upper breakeven, the position needs to be closed or adjusted then, not after it has gone through. Write the level down at entry.
Beware of gaps. An overnight gap can move the price straight through the upper breakeven before you can act. Unhedged ratio spreads carried overnight or through events carry that risk in full.
Count the costs. Three options, each with charges and a bid-ask spread, on entry and exit. On a maximum profit that is only reached at one price, costs matter.
The honest summary: an unhedged ratio spread is a structure with unlimited risk that looks like a cheap spread. With a wing added, it becomes a reasonable, defined-risk way to express a view on a moderate move.
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Prices in the example are illustrative, not market data. Lot sizes, margin rules and charges are set by the exchanges and SEBI and change from time to time. This is educational material, not advice, and no position is recommended. We run no tips group and no signal service, we manage nobody's money, and no return is promised. Derivatives can lose more than the amount blocked against them.
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Frequently Asked Questions
What is a ratio spread?
An options structure that buys options at one strike and sells a larger number at another, most commonly one bought and two sold. It profits from a moderate move toward the sold strike.
What is the risk in a call ratio spread?
One of the sold options is uncovered, so above the upper breakeven the loss grows without limit as the price rises. The position can lose money if the underlying moves in the expected direction by too much.
How do I calculate the breakevens of a 1x2 call ratio spread?
The lower breakeven is the bought strike plus the net cost. The upper breakeven is the sold strike plus the maximum profit, where maximum profit is the distance between strikes minus the net cost.
What is the difference between a ratio spread and a backspread?
A ratio spread sells more options than it buys and profits from a moderate move. A backspread buys more than it sells and profits from a large move. They are opposite bets.
How can I limit the risk of a ratio spread?
Buy a further option beyond the sold strike to cover the naked leg. This turns it into a broken-wing butterfly with defined risk on both sides, at a small extra cost.
Related Reading
- Options course, Gurugram edition
- What a ratio becomes with a wing
- The fully hedged vertical spread
- Why the naked leg needs full margin
- Volatility during a sharp move
- Overnight gaps and open positions
Disclaimer: TheFinBaba provides educational content only - this is not investment advice. Trading involves risk of loss.
