Tim Olson
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34 lines
1.6 KiB
Markdown
34 lines
1.6 KiB
Markdown
---
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description: "A neutral-to-bullish income strategy selling more near-ATM puts at K1 than ITM puts bought at K2 > K1, collecting premium with unlimited downside risk below the lower breakeven."
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tags: [options, income, neutral, ratio-spread]
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---
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# Ratio Put Spread
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**Section**: 2.39 | **Asset Class**: Options | **Type**: Income
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## Overview
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The ratio put spread consists of a short position in N_S close to ATM put options with strike K1, and a long position in N_L ITM put options with strike K2 (K2 > K1), where N_L < N_S. Typically N_L = 1, N_S = 2 or N_L = 2, N_S = 3. This is an income strategy if structured as a net credit trade. The trader's outlook is neutral to bullish.
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## Construction
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- Sell N_S put options at strike K1 (near ATM)
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- Buy N_L put options at strike K2 (ITM, K2 > K1, N_L < N_S), same expiry
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Net debit or credit H
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## Payoff Profile
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f_T = N_L × (K2 - S_T)+ - N_S × (K1 - S_T)+ - H
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- Upper breakeven (if H > 0): S*_up = K2 - H/N_L
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- Lower breakeven: S*_down = (N_S × K1 - N_L × K2 + H) / (N_S - N_L)
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- Max profit: P_max = N_L × (K2 - K1) - H (in zone [K1, K2])
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- Max loss: L_max = N_S × K1 - N_L × K2 + H (if stock goes to zero; unlimited downside)
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## Key Conditions / Signals
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- Neutral to mildly bullish; expects stock to remain above K1
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- Structured as a net credit when possible (income strategy)
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- High implied volatility makes the collected premium from extra short puts larger
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## Notes
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Unlike the put ratio backspread (where N_L > N_S), here N_L < N_S, so there is net short put exposure below K1 creating unlimited downside risk. The maximum profit is achieved if the stock stays in the [K1, K2] zone at expiry.
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