Put Ratio
Spread

What is a put ratio spread?

A put ratio spread is a multi-leg options trade that buys one higher-strike put and sells two lower-strike puts of the same expiry — a 1×2 structure. Selling more options than you buy usually means the premium collected exceeds the premium paid, so the trade is typically opened for a net credit.

The character is neutral-to-mildly-bearish: profit peaks if the underlying eases down to the short strike by expiry, where the long put is fully in the money and both short puts expire worthless. The extra short put is the catch — below the short strike that uncovered leg creates open-ended downside risk, the defining hazard of the strategy.

Key takeaways

• Structure: buy 1 higher-strike put, sell 2 lower-strike puts, same expiry.
• It is neutral-to-mildly-bearish — you want a gentle slide, not a crash.
• Usually opened for a net credit, since two short puts collect more than one long put costs.
• Maximum profit lands if the underlying expires right at the short strike.
• The extra short put leaves open-ended risk below the short strike — the trade must be managed.

How a put ratio spread works

Think of it as a bear put spread (long higher put, short lower put) plus one extra naked short put at the lower strike. Above the long strike everything expires worthless and you keep any credit. Between the strikes the long put gains value, peaking at the short strike. Below the short strike the two short puts lose faster than the single long put gains, so profit erodes, hits a lower breakeven, and the loss then runs until the underlying reaches zero.

Because one short put is effectively uncovered, the exchange blocks SPAN + exposure margin on the net short exposure. Time decay generally helps — while the underlying stays above the short strike, theta erodes the short puts in your favour — and falling implied volatility aids the net-short vega. For index options the legs are cash-settled, so a steep fall is settled in cash, not delivery.

The numbers that matter

Worked NIFTY example

Suppose NIFTY is near 22,500 and you expect a slow slide toward 22,300, not a crash. You buy one 22,500 put at ₹150 and sell two 22,300 puts at ₹80 each. The net premium is (2 × 80) − 150 = ₹10 credit. With a lot size of 75, you collect ₹10 × 75 = ₹750 up front (illustrative figures):

• Max profit: at 22,300, the long put is worth 200 points; profit = (200 + 10) × 75 = ₹15,750.
• Lower breakeven: 22,300 − 210 = 22,090, below which the extra short put dominates.
• Below breakeven: loss grows ₹75 for every additional point down — open-ended.

NIFTY at expiry	Outcome	P&L (1 lot)
22,600	All puts worthless	+₹750
22,500	Long put ATM	+₹750
22,300 (short strike)	Peak profit	+₹15,750
22,090 (lower BE)	Profit erased	₹0
21,700	Extra short put hurts	−₹29,250

The sweet spot is a controlled slide to 22,300. A sharp sell-off below 22,090 is the real danger — the lone uncovered put loses heavily all the way down toward zero.

When to use a put ratio spread

• You expect a mild, capped move down toward a level you can name — not a crash.
• Implied volatility is elevated, making the two short puts richly priced.
• You want a trade that profits even if the market stalls, thanks to the credit and theta.
• You have a strict exit plan or a protective long put below to cap the open downside.

Risks to respect

• Open-ended downside: a gap-down past the lower breakeven can produce very large losses.
• Margin expansion: as the trade moves against you, blocked margin can rise and force a square-off.
• Assignment on the extra short put: a deep-ITM short put can be assigned, leaving a settlement obligation.
• Volatility spike: crashes come with IV spikes that inflate the net-short position fast.

Put ratio spread vs bear put spread

A bear put spread buys one put and sells one put — risk is fully defined and capped. The put ratio spread adds a second short put to harvest more premium (often a credit) and a higher peak profit, but that extra leg converts the defined-risk spread into one with open-ended downside risk. Use the ratio only when you are confident the fall will stay contained.

Put ratio spread vs put ratio back spread

The put ratio back spread is the mirror image: it sells one put and buys two lower puts, so it wants a sharp crash and has open profit, capped risk. The put ratio spread does the opposite — it sells the extra put, profits from a stall or mild fall, and carries the open downside risk. They suit opposite views on how violent the move down will be.

Common adjustments

To cap the open risk, traders buy a further out-of-the-money put, converting the position into a defined-risk broken-wing butterfly. Rolling the short puts down and out as the market slides locks in gains and re-extends the profit zone. If the view turns wrong, closing the extra short put alone leaves a clean bear put spread.

Frequently asked questions

Is a put ratio spread bullish or bearish?

Neutral-to-mildly-bearish. The ideal is a gentle slide down to the short strike by expiry; a sharp crash below it turns the trade into a loss.

What is the maximum loss on a put ratio spread?

Open-ended below the short strike, because of the extra short put. The loss caps only when the underlying reaches zero, so a steep fall can be very costly.

Why is a put ratio spread usually a credit?

Selling two puts generally collects more than buying one higher-strike put costs, so the trade usually opens for a net credit that cushions a mild move.

Where does a put ratio spread make the most money?

At the short strike on expiry: the long put is fully in the money, both short puts expire worthless, and you keep any opening credit.

The bottom line

The put ratio spread is a precision trade for a mildly bearish-to-neutral view: collect a credit, let theta work, and earn a peak payoff if the market eases down to the short strike. But the extra short put is a loaded leg — below the lower breakeven the loss runs all the way toward zero. Treat it as an advanced, actively-managed position, ideally with a protective long put or a firm stop, and it becomes a clean way to monetise a contained slide.

Related strategies & terms

• Bear Put Spread — the defined-risk 1×1 base of this trade.
• Put Ratio Back Spread — the mirror that wants a sharp crash.
• Call Ratio Spread — the upside equivalent of this structure.
• Undefined Risk · Theta · SPAN Margin