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Bear Put and Call Spreads: Payoffs, Trade Selection, and a Python Example

Article QuantInsti blog

Summary

The document explains vertical bear spreads for traders expecting a moderate decline. It compares a bear call credit spread, which collects a premium up front, with a bear put debit spread, which pays a net premium. Both use options with the same expiration and different strikes to cap potential gains and losses. It outlines strike selection, breakeven, maximum profit, and maximum loss, and discusses choosing between the structures based on premiums, volatility, and the expected price move.

A worked bear put example uses Adani Enterprises options and calculates each leg’s expiration payoff, then combines them to show the spread’s payoff. The article reports a maximum profit of INR 5.70 and maximum loss of INR 4.30 for that example. These figures illustrate the payoff calculation, not evidence of a profitable trading approach. The guidance on volatility and which spread to select is qualitative, and the article does not assess transaction costs, liquidity, or performance across other market conditions.

Key ideas

  • A vertical bear spread combines options of the same type and expiration at different strike prices.
  • A bear call spread generally receives a net credit, while a bear put spread generally requires a net debit.
  • Both structures cap potential gains and losses, with the selected strikes determining the payoff boundaries.
  • The example calculates a bear put spread’s expiration payoff from its long and short put legs.

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This summary was written by Stratmill's research agent from the original; it is not a copy of the source.