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Synthetic Short Selling: An Advanced Shorting Strategy



For investors looking to profit from a decline in a stock's price, one strategy that has grown in popularity is synthetic short selling. This advanced technique allows investors to effectively short a stock without actually borrowing and then selling shares in the traditional way.



What is Synthetic Short Selling?


A synthetic short position involves the combination of derivative instruments to create an economic exposure equivalent to a outright short sale of stock. The most common way this is achieved is through the simultaneous purchase of at-the-money put options and sale of the same number of call options on a given stock with the same strike price and expiration date. This options strategy is referred to as a synthetic short because it replicates the potential profit/loss scenario of a traditional short sale without the need to first locate and borrow shares to sell short. The maximum potential loss is limited to the net premium paid for establishing the synthetic position.


Example of a Synthetic Short Position


Suppose an investor is bearish on XYZ stock, currently trading at $50 per share. Instead of shorting shares directly, they could employ a synthetic short position by doing the following:


  • Buy to Open 10 XYZ $50 strike put options (at a cost of $3 per contract)

  • Sell to Open 10 XYZ $50 strike call options (collecting $2 per contract)


The net debit paid is the premium for the puts ($3,000) minus the premium received for the calls ($2,000), which equals $1,000. If XYZ drops to $40 by option expiration, the puts will be worth $10 each and the calls will expire worthless, resulting in a $9,000 gain ($10,000 - $1,000 debit) on the synthetic position. Like a traditional short sale, the synthetic position has upside risk limited to the original debit paid. If XYZ stock goes up significantly, the gain on the short calls will be offset by the loss on the long puts, with the maximum possible loss being the $1,000 paid.


Benefits and Risks


There are a few key benefits to using a synthetic short position:


  • No need to borrow shares and pay lending fees

  • Upside risk is limited to premium paid

  • Potential for leverage due to options

  • More straightforward tax treatment


However, synthetic shorts also carry some risks such as:


  • Commissions paid for both option legs

  • Options have expiration dates which can limit duration compared to short stock

  • Volatility changes can impact options pricing


Considerations for Synthetic Short Selling


While synthetic short positions can be an effective way to express a bearish view, there are several important considerations to keep in mind:


  • Time Decay: Unlike a traditional short stock position that can theoretically be held indefinitely, options have a limited lifespan due to time decay (theta). As options approach expiration, their remaining time value erodes quickly. This makes synthetic shorts less effective as a long-term holding. Traders often look to re-establish new synthetic positions periodically by rolling out to longer-dated options.

  • Volatility Impact: The value of options is heavily influenced by volatility levels. An increase in implied volatility raises the value of options, which benefits the long put portion but hurts the short call side of a synthetic short trade. Conversely, if volatility declines, it will have a negative impact on the trade's profitability.

  • Upside Risk: While the maximum risk is defined as the premium paid, there is still significant upside risk if the underlying stock rallies sharply. The short call position has unlimited theoretical upside risk. This can result in the need to adjust or closeout the position defensively to prevent further losses.

  • Dividend Impact: For stocks that pay dividends, those cash flows aren't received for a synthetic position the way they would be for a traditional short stock trade. So dividends can adversely impact the effective returns of a synthetic strategy versus an outright short.

  • Assignment Risk: While relatively uncommon with liquid, actively-traded options, there is the possibility that the short call portion of the trade could be assigned early if the calls go far in-the-money. This would result in taking on a short stock position with associated margin requirements.

  • Margin Requirements: Options traders need to be properly capitalized in their accounts to meet the margin requirements for holding synthetic short positions. These requirements can fluctuate based on changes in the options prices, volatility levels, and amount of leverage employed.

  • Tax Implications: The tax treatment of profits and losses can differ between synthetic short positions and outright short sales of stocks. Options have holding periods of one year or less categorized as short-term. The "constructive sale" rules may also apply in certain scenarios. Traders should understand the tax ramifications.


Synthetic shorts using options can be viable alternatives or complementary strategies to traditional shorting stock. But they require an in-depth understanding of options risk factors like volatility and time decay. Used prudently, they can offer flexibility and defined risk for bearish traders while avoiding some challenges of borrowing shares.

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