Synthetic Short Call¶
A synthetic short call replicates the payoff of a short call option by combining a short stock position with a short put at the same strike price and expiration date. The position produces a limited profit if the stock stays below the strike and unlimited loss if the stock rises. Its equivalence to a short call is a direct consequence of put-call parity.
HOW IT WORKS¶
The construction is: Synthetic Short Call = Short Stock + Short Put. Entering the position generates a credit equal to the short sale proceeds plus the put premium received. The breakeven at expiration is the short sale price minus the put premium. Maximum profit is capped at the total credit collected and is realized if the stock closes at or below the strike; maximum loss is unlimited as the stock rises, identical to a naked short call. Both legs must share the same strike and expiration. The short stock component introduces a stock borrow fee that a plain short call does not carry, and the short put creates assignment risk independent of the stock leg.
IN TAPEBOARD¶
In the Tapeboard terminal, open the Strategy Builder and select Synthetic Short Call from the strategy template menu. Tapeboard automatically links the short stock leg and the short put leg at a matching strike and expiration, displays the combined Greeks across both legs, and highlights the unlimited loss zone on the payoff diagram in red. The Risk Monitor flags the position as carrying unlimited upside exposure and calculates the margin requirement for the combined position in real time. Use the Scenario Table to model P&L at expiration across a range of underlying prices before entry.