Definition
Box Spread
A box spread combines a bull call spread and a bear put spread at the same strikes to create a near risk-free, fixed payoff.
By pairing a bull call spread and a bear put spread on the same two strikes, the box locks in a fixed value equal to the strike difference at expiry, regardless of where the underlying ends up. Its profit comes from any mispricing between the legs versus that fixed value — essentially an arbitrage and a synthetic lending/borrowing tool.
On the NSE, box spreads are mostly an arbitrage play for sophisticated traders exploiting tiny pricing gaps, since the payoff is largely deterministic. Execution risk, transaction costs, and the four legs of margin mean they are rarely worthwhile for retail traders.
Related terms
- Bull Call SpreadA bull call spread buys a lower-strike call and sells a higher-strike call to bet on a moderate rise at lower cost.
- Bear Put SpreadA bear put spread buys a higher-strike put and sells a lower-strike put to profit from a moderate fall at lower cost.
- Synthetic LongA synthetic long replicates owning the underlying by buying a call and selling a put at the same strike.
- Cash-and-Carry ArbitrageCash-and-carry arbitrage profits from a futures premium by buying the stock in cash and selling its future simultaneously.
Plain-English explainer from The Dispatch Investors Encyclopedia. General information, not financial advice.