Synthetic Short

## The construction A synthetic short reproduces the payoff of short-selling a stock or index using only options. You sell (write) a call and buy a put, both at the same strike price and same expiry. The combination behaves almost exactly like being short the underlying: as the price falls you profit, as it rises you lose — with a near one-to-one delta of about −1, just like an actual short position.

## Why traders use it - To short where direct shorting is hard: in India you generally cannot carry a naked short in the cash (delivery) market overnight — equity short-selling is mostly intraday for retail, and stock borrowing (SLB) is limited. A synthetic short in stock or index F&O lets you hold a bearish view across days/weeks within the derivative framework. - Capital efficiency / put-call parity: by combining the two legs, the position's cost and behaviour are governed by put-call parity, often making it cheaper or more flexible than alternatives. - Building blocks for spreads: a synthetic short is the base for many structured strategies.

## The Indian market practicalities Index options (Nifty, Bank Nifty) are European and cash-settled, which makes synthetic shorts on them clean to manage. Single-stock options are American and physically settled at expiry, so a synthetic short on a stock that you let run to expiry can result in delivery obligations — the written call may be assigned, and the long put may need exercising — which traders must plan for. The short call leg also has theoretically unlimited loss if the underlying rallies, exactly like a real short, so margining (SPAN + exposure) is substantial.

## Risks to respect - Unlimited upside risk on the short call if the market rallies hard. - Margin and MTM: the written call attracts heavy margin and daily mark-to-market. - Assignment/physical settlement on stock options near expiry.

Bottom line: a synthetic short is a precise, options-based way to express a bearish view — especially useful given India's restrictions on overnight cash shorting — but it carries the same unlimited-loss profile as a genuine short and demands disciplined margin and expiry management.