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Neutral2 LegsUndefined risk

Put Ratio Spread

Buy one put and sell two lower puts, usually for a credit. Profits from a modest fall to the short strike, with open ended risk below it.

By Team Agora Circle

Written by the Agora Circle editorial team. Educational content, explained for the Indian market. Not investment advice.

Market outlook
Neutral to mildly bearish. You expect a limited fall, not a crash.
Setup
Buy 1 put at a higher strike and sell 2 puts at a lower strike, often for a net credit.
Max profit
Capped. At the short strike: the strike gap plus any net credit received.
Max loss
Open ended below the short strike, because you are net short one extra put.
Breakeven
Above there is usually no loss if entered for a credit; below, the short strike minus the strike gap and net credit.
Implied volatility
Net short vega. Falling implied volatility helps; a volatility spike hurts.
Time decay
Time decay generally helps, since you are net short an option.

Strategy Overview

A put ratio spread is the downside mirror of the call ratio spread. You buy one put and sell two puts at a lower strike, leaving you net short one extra put. Opened for a small net credit, it keeps that credit if the market rises or stays flat, and it profits most from a gentle fall that carries the index down to the short strike.

The open ended risk sits below the short strike. Being short one more put than you are long, a sharp fall turns the position into an effective naked short put, and the loss grows as the index drops, all the way toward the strike level times the lot in the worst case. It is a trade for a limited decline, not a market crash.

It fits a neutral to mildly bearish view where you expect the index to ease lower but not collapse. The reward is capped at the short strike, the upside is usually harmless, and the cost of that shape is a downside tail that has to be respected, particularly since falls often come with rising volatility.

How to Set It Up

Two strikes in a one to two ratio, all puts, ideally structured for a net credit.

  1. 1Buy 1 put at or near the money.
  2. 2Sell 2 puts at a lower strike, choosing the distance so the premium collected roughly matches or exceeds the cost of the long put.
  3. 3Note the net credit or debit. Below the short strike you carry the risk of one naked short put.

Payoff Diagram and Example

Max Profit

Capped. At the short strike: the strike gap plus any net credit received.

Max Loss

Open ended below the short strike, because you are net short one extra put.

Breakeven

Above there is usually no loss if entered for a credit; below, the short strike minus the strike gap and net credit.

Put Ratio Spread payoff diagram024,80025,000BE 24,570ProfitLossNIFTY at expiry

Suppose NIFTY is at 25,000 and you expect a limited fall. You buy the 25,000 put for 190 and sell two 24,800 puts for 110 each. You collect 220 against 190 paid, opening for a net credit of 30 points, about Rs 2,250 on a lot of 75.

If the index finishes at 24,800, the long put is worth 200, the two short puts expire worthless, and you keep the 30 credit, for a peak profit of 230 points, about Rs 17,250. Above 25,000 everything expires worthless and you keep the 30 point credit.

The risk is below. The downside breakeven is 24,570, and beyond it the extra short put means the loss grows as the index falls. A drop to 24,300, for instance, would produce a meaningful loss, so a downside stop is essential.

Entering and Exiting

Enter both legs together for a net credit, which keeps the upside harmless and gives a clean risk picture.

Exit by closing the package once the index nears the short strike and the profit is largely captured, rather than holding into a possible further slide.

Set a firm downside rule. Because the risk is open ended below the short strike, a stop on the index level or on the position's loss is what prevents a ratio spread from becoming a large naked short put in a fast fall.

Time Decay (Theta)

Time decay usually helps, since you are net short an option. While the index stays at or above the short strike, the two short puts decay faster than the single long put.

That benefit only holds down to the short strike. Below it, the price risk from the extra short put dominates and decay is irrelevant to the growing loss.

Implied Volatility (Vega)

The position is net short vega, so falling implied volatility helps and a spike hurts. Entering when IV is elevated collects richer premium on the short puts.

Falls in the index often coincide with a jump in implied volatility, which inflates the short puts at the same time the price moves against them. That combination is the sharpest version of the downside risk.

Common Adjustments

If the index falls toward the short strike, buy back one short put to remove the naked exposure, turning the trade into a defined risk bear put spread.

Roll the short puts down and out to push the risk zone lower, treating the added premium as a fresh decision rather than a rescue.

If the credit has been earned and the index is sliding, closing the whole position is often the cleanest way to avoid the open ended downside tail.

Synthetic Equivalent

A put ratio spread is a bear put vertical, long the higher put and short one lower put, plus an extra naked short put at the lower strike. That extra short put adds the premium and the open ended downside risk.

Buying back the extra short put reduces the position to a plain bear put spread, the defined risk core inside the ratio.

Pros and Cons

Pros

  • Often opened for a net credit, so a flat or rising market still profits.
  • Strong capped profit if the index drifts down to the short strike.
  • Time decay and falling volatility both tend to help.
  • Strikes can be placed to centre the profit peak on your expected level.
  • Can be repaired into a defined risk bear put spread if the fall accelerates.

Cons

  • Open ended risk below the short strike from the extra naked put.
  • A sharp fall, usually with rising volatility, can produce a large loss.
  • Requires margin for the naked short put and active management.
  • Not suitable when a crash or steep decline is plausible.

Frequently Asked Questions

How is this different from a bear put spread?

A bear put spread is one long put and one short put, fully defined risk. A put ratio spread sells an extra put, which adds premium and shifts the profit peak but introduces open ended risk below the short strike. Buying back that extra put turns it back into a bear put spread.

Where is the danger in a put ratio spread?

Below the short strike. The extra short put behaves like a naked short put in a fall, so the loss grows as the index drops. Because declines often bring rising volatility too, this downside tail is the risk to manage above all.

Why is a put ratio spread usually opened for a credit?

A net credit makes the upside harmless, since a flat or rising market lets everything expire worthless while you keep the premium. It also lowers the downside breakeven, giving the trade more room before the naked short put begins to bite.

Where does a put ratio spread make the most money?

At the short strike: the gap between the strikes plus any net credit. In the example that is the 200 point gap plus the 30 credit, or 230 points, about Rs 17,250, reached if the index finishes at 24,800.

Is a put ratio spread bearish?

Only mildly. It profits most from a limited fall to the short strike and tolerates a flat or rising market. A steep decline is what hurts it, so it expresses a neutral to slightly bearish view on a contained move.

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This page is for education only. It is not investment advice, and nothing here is a recommendation to buy or sell any instrument. Options involve substantial risk, and option sellers can lose far more than the premium they receive. Please do your own research or consult a SEBI registered investment adviser before trading. Read our full disclaimer.

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