Iron Butterfly — Strategie de opțiuni

The iron butterfly is a high-probability, market-neutral options strategy that earns maximum profit when the underlying closes exactly at the short strike at expiration. It is constructed by combining a short straddle (selling an ATM call and ATM put) with a long strangle (buying an OTM call and OTM put) as protective wings. The result is a strategy that collects a large upfront credit but requires the stock to stay near the center strike to achieve full profit.

Compared to an iron condor, the iron butterfly has a higher maximum credit (since both short options are ATM) but a much narrower profit window. The trade wins maximally only if the stock expires at exactly the short strike—any significant movement in either direction erodes profit. This narrower sweet spot makes iron butterflies better suited for underlying assets with very low expected moves, such as after implied volatility is already well below the historical average.

The trade is set up by selling both the ATM call and ATM put, then buying an equidistant OTM call and OTM put to define risk. The credit received is typically 40-60% of the total spread width, which is significantly higher than a comparable iron condor. The maximum loss equals the wing width minus the total credit on each side. Breakeven points are the short strike plus and minus the net credit received.

Iron butterflies benefit from time decay and volatility contraction. The four legs are most sensitive to theta near ATM, meaning the strategy captures the fastest time decay around the short strike as expiration approaches. A drop in IV after entry further increases the value of the position, as the short ATM options deflate faster than the long OTM wings.

The primary challenge with iron butterflies is their sensitivity to even moderate price moves. Unlike an iron condor's wide profit zone, an iron butterfly requires careful management. Most professionals take profit at 25-35% of maximum credit—earlier than an iron condor—because the narrower profit window means the trade can go from profitable to losing quickly. Adjustments involve rolling the challenged side to restore balance or converting to a wider iron condor by rolling one or both short strikes.