Back Spread — Strategie de opțiuni

A back spread (or reverse ratio spread) is the opposite of a ratio spread—you sell fewer options and buy more, creating a long volatility position that benefits from large moves. The typical structure is 1:2: sell one ATM option and buy two OTM options of the same type. The single short option finances (partially or fully) the two long options, creating a position that profits from a big move in the direction of the long options.

Call back spreads profit from a large rally—the two long calls gain significantly more than the single short call loses. Put back spreads profit from a large decline—the two long puts amplify the payoff of the position beyond what one put would provide. In both cases, the financed structure means you enter with minimal net debit or even a credit.

The back spread has a unique P&L profile: it loses value if the stock stays flat (both the short and long options decay), makes a modest profit if the stock moves slightly against the short option, and gains significantly if the stock makes a large move in the long option's direction. The worst outcome is the stock moving to exactly the short option's strike and staying there—the bought options lose value while the short option gains.

Back spreads are suited for high-volatility environments where you expect a large directional move but want to minimize upfront cost. They are also used as adjustments to existing positions—converting a threatened naked option into a back spread by buying additional long options at a further strike adds long volatility to a position under stress.

The key appeal of a back spread is the asymmetric payoff: you cannot lose much on a moderate move (the position is near zero-cost), but you can gain significantly from a large move. This makes back spreads attractive for traders with a binary view—expecting either a dramatic move or relative stasis, not a gradual trend.