Synthetic Put
Short stock and buy a call to create a position equivalent to a long put.
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What Is a Synthetic Put?
A synthetic put replicates the payoff of a long put option by combining a short stock position with a long call at the same strike price. If the stock falls, the short stock position profits in the same way a long put would. If the stock rises, the long call's gains offset the losses on the short stock position — capping the maximum loss at approximately the premium paid for the call. By put-call parity, this combination is theoretically equivalent to owning a put with the same strike and expiration. Synthetic puts are used when actual put options are not available on a particular security (for example, on an ETF or security where puts are illiquid or unavailable), or when the synthetic construction produces a cheaper effective premium than the listed put. Market makers regularly use synthetic positions for arbitrage and hedging.
When to Use a Synthetic Put
Use a synthetic put when you want bearish exposure through a put-like payoff but cannot obtain a real put option at an acceptable price or liquidity. This can occur when the underlying has listed puts with very wide bid-ask spreads, or when a specific expiration or strike is unavailable. The synthetic put is also used when you already hold a short stock position and want to add a defined-risk cap on losses — buying a call against an existing short converts it into a synthetic put with bounded upside loss. In most retail trading contexts, a real put option is simpler and more cost-effective — understand the mechanics of the synthetic before assuming it is cheaper, as borrowing costs on the short stock can significantly erode the edge.
Trade Structure
Short 100 shares of the underlying stock (establish a bearish position) and buy 1 call option at the same strike as the implied "put strike" you want to replicate, same expiration. The call premium paid is analogous to the premium you would pay for a real put. You must have margin approval and short selling capability to execute this strategy.
Max Profit
The stock falls to zero: the short stock profits (100 × strike price) minus the call premium paid and any borrowing costs on the short stock. The effective maximum profit is similar to a long put — significant on a large stock decline — reduced by the cost of the call and the ongoing stock borrow cost. This is the primary asymmetry versus a real put: borrowing costs erode the synthetic put's profit over time.
Max Loss
Limited to the call premium paid (plus borrow costs) in the ideal case: if the stock rises above the call strike, the call's gains cap the loss on the short stock position at approximately the premium paid. However, in practice, execution timing between the short stock and call purchase can create brief windows of unhedged exposure, and borrow costs can add to the effective loss over time.
Breakeven
Strike price minus the call premium paid (similar to a put's breakeven = strike minus put premium). For example, shorting stock at $100 and buying a $100 call for $3.00 creates a breakeven at $97.00 — the stock must fall below $97 for the trade to produce a net profit after the call cost.
Greeks Profile
Equivalent to a long put by put-call parity: delta is negative (profits as stock falls), theta is negative (time decay on the long call hurts over time), vega is positive (rising IV increases the call's value, benefiting the hedge), and gamma is positive (gains accelerate as the stock moves through the strike). The short stock has no theta or vega — these characteristics come entirely from the long call.
Synthetic Put Trading Tips
- Always compare the effective cost of the synthetic put (call premium + borrow costs) against the price of an equivalent listed put — the real put is often simpler and cheaper.
- Watch borrow costs on the short stock — high borrow rates (common on "hard to borrow" stocks) can make the synthetic significantly more expensive than a real put.
- The call must be purchased simultaneously with the short stock to ensure the position is immediately hedged — executing legs separately creates unhedged risk windows.
- Margin requirements for short stock are typically higher than for buying a put — factor this into your capital allocation when comparing the two approaches.
- If a real put becomes available at a reasonable price after you have established the synthetic, consider converting by covering the short stock and selling the call, then buying the real put.
- Market makers use synthetics extensively for inventory management and arbitrage, not as speculative tools — retail traders should generally prefer real options for simplicity.
- Understand that put-call parity is theoretical — in practice, dividends, early exercise risk, and borrow costs create pricing differences between real and synthetic positions.
- A synthetic put on a dividend-paying stock requires careful attention to ex-dividend dates: the short stock position owes the dividend payment, which reduces the effective profit.