What is a double barrier option and how does it differ from single barrier options?

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AcadiFi · Accepted Answer

A double barrier option has two barriers, one above and one below the current spot, and the option either exists only while the underlying stays between them (double knock-out) or comes alive only when one is breached (double knock-in).

Example: structured desk trader Aurelio Montemayor at Puerta del Sol Bank sells a double knock-out call on the Zephyros 50 index currently at 1,200. Upper barrier 1,350, lower barrier 1,080, strike 1,220. The call pays normally at expiry only if the index never touches either barrier during the one-year life. Breach either side, and the option dies, often with a small rebate.

Corridor or range options are closely related: they pay a fixed amount for each day the underlying stays within a defined corridor, making them intensely path-dependent.

Double barrier structures are cheaper than vanilla options because both tails of the distribution can kill the contract. They appeal to range-bound views on volatility and are commonly embedded in structured notes sold to retail investors seeking enhanced yield.

What is a double barrier option and how does it differ from single barrier options?

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