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Ratio Put Spread: Low-Cost Decline Exposure with Deep-Downside Risk

For educational purposes only; not investment advice.

Direct answer

Section titled “Direct answer”

This article defines a 1-by-2 ratio put spread as buying one put at higher strike K_H and selling two puts at lower strike K_L, with one expiration and K_H > K_L. The long put offsets only one short put. Below K_L, the package retains the downside economics of one net short put.

The second sale can reduce the debit or create an entry credit. In exchange, the strategy targets a moderate decline toward K_L, not a crash. Profit peaks at the lower strike and then falls as the underlying declines further. For an ordinary equity bounded by zero, the loss is large but finite.

Ratio-spread names vary. The opposite quantity relationship, usually called a put ratio backspread, has a very different downside tail. Signed quantities matter more than the label.

Piecewise expiration payoff

Section titled “Piecewise expiration payoff”

Let C be net credit per share; use negative C for a debit. Expiration profit per share is:

Π(S_T) = max(K_H−S_T,0) − 2max(K_L−S_T,0) + C

  • S_T ≥ K_H: every put expires worthless; profit is C.
  • K_L ≤ S_T < K_H: only the long put has intrinsic value; profit rises as price falls, reaching K_H − K_L + C.
  • S_T < K_L: profit is K_H − 2K_L + S_T + C; every further dollar of decline reduces profit by one dollar.
  • The lower breakeven is 2K_L − K_H − C.

Maximum expiration profit occurs at K_L. If the underlying cannot fall below zero, maximum loss at zero is 2K_L − K_H − C per share when this value is positive. Before expiration, net Greeks depend on spot and volatility skew; after the price crosses the short strike, the position can become positive Delta and negative Gamma, losing from further decline.

A 100/95 one-by-two ratio spread

Section titled “A 100/95 one-by-two ratio spread”

With the stock near 100, buy one 100 put, sell two 95 puts, and receive a 1.00 net credit. With a 100-share multiplier and before fees:

Stock at expiration Option payoff per share Profit/loss per share Position profit/loss
105 or 100 0 1 +$100
96 4 5 +$500
95 5 6 +$600
90 0 1 +$100
89 −1 0 $0
80 −10 −9 −$900
0 −90 −89 −$8,900

Maximum profit is $600 at 95, and the lower breakeven is 89. Below 89, every further $1 decline creates another $100 loss for the package. At zero, maximum loss is $8,900. The $100 entry credit is therefore not a measure of economic risk.

For a debit entry, substitute negative C: profit above K_H becomes the debit loss, peak profit falls, the lower breakeven moves higher, and zero-price loss increases. Use the actual combination fill.

Risk and implementation checklist

Section titled “Risk and implementation checklist”
  • Verify +1/−2 quantities, one expiration, multiplier, and debit or credit. Reversing the ratio reverses the crash tail.
  • Calculate the lower breakeven and zero-price loss; do not stop the risk graph at the short strike.
  • Reserve buying power and cash for one or both short puts. Margin is collateral policy, not maximum loss.
  • Use a multi-leg limit order. Partial fills can leave two uncovered short puts or another unintended position.
  • American-style short puts can be assigned before expiration, creating stock even while the long put remains open.
  • Assignment of one leg does not automatically exercise the long put or close the other short. Manage each resulting position explicitly.
  • Plan pin and expiration risk at K_L, where either, both, or neither short may be assigned depending on exercise decisions.
  • Buying another lower-strike put can cap the deep-downside loss, but creates a different four-leg structure and changes premium and breakevens.

Common misconceptions

Section titled “Common misconceptions”
  • “One long put covers two short puts.” It offsets only one; one net short put remains below K_L.
  • “A credit entry means no loss.” A deep decline can consume far more than the initial credit.
  • “It benefits from any decline.” Profit peaks at K_L; a larger decline eventually creates a loss.
  • “Maximum loss is the strike width.” That describes a 1:1 vertical, not this 1:2 ratio.
  • “The short strike is the breakeven.” It is the peak-profit point; the breakeven is lower and depends on premium.
  • “The downside loss is unlimited.” For ordinary stock it is bounded by zero, though still potentially severe.
  • “It is the same as a put ratio backspread.” A backspread normally owns more puts than it sells and has the opposite crash exposure.
Section titled “Related topics”

Authoritative sources

Section titled “Authoritative sources”