Options Academy
Put Trading 104: Conversions, Put-Call Links, and Put Buying vs Short Stock
Put and call prices are linked by conversion/reversal arbitrage. This post also compares buying puts versus shorting stock in real trade design.
Conversion and Reversal Intuition
A conversion-style package (long stock + long put + short call at same strike/expiry) hedges directional risk and anchors relative pricing.
The reverse package (short stock + short put + long call) does the opposite side of the arbitrage.
These flows help keep put/call prices aligned rather than independent.
Conversion Legs
Long stock + Long put + Short call
Reversal Legs
Short stock + Short put + Long call
Purpose
Exploit mispricing and re-align parity
Impact
Links put and call valuation
Long Put vs Short Stock: Core Difference
Both are bearish, but risk profile differs sharply.
Short stock has theoretically unlimited loss if stock rises. Long put loss is capped at premium paid.
Long puts can deliver high percentage gains in sharp drops due to leverage and convex payoff.
Bearish Exposure Comparison (Conceptual)
- longPut
- shortStock
Choosing Which Put to Buy
If expecting a moderate decline, ITM puts often behave more reliably than far OTM puts.
If expecting a very large move, cheaper OTM puts can produce higher percentage returns but with higher probability of total loss.
When ITM puts across expiries have similar time value, buying longer maturity can improve flexibility.
Moderate Bear View
Prefer ITM or near-ATM puts
Crash View
OTM puts may offer convex upside
Tenor Choice
Longer tenor if extra premium is small
Practical Filter
Liquidity + spread + IV level
Execution Framework
1) Define expected move horizon (30/60/90 days).
2) Estimate upside/downside scenarios and option value response.
3) Rank candidates by reward potential and risk/reward, not by raw premium only.
4) Plan profit-taking/stop rules before entry.
Key takeaways
- Put/call prices are coupled through conversion/reversal arbitrage.
- Long puts cap downside risk versus unlimited short-stock risk.
- Strike/tenor selection should match expected move size and timing.
- Use structured scenario ranking, not intuition alone.
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Series
Put Option Basics Masterclass
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