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Summary

A butterfly combines a bull spread and a bear spread sharing a middle strike, producing maximum profit if the underlying finishes exactly at that strike and small defined losses elsewhere2. The iron butterfly is the short-volatility income form — a short ATM straddle with OTM wings — trading a bigger credit and faster theta than a condor for a much tighter profit tent1. Long (debit) butterflies are the cheap-tail form: a small bet on a precise target with strictly limited risk.

Construction

  • Iron butterfly (short-vol): sell ATM straddle, buy wings at roughly 1 standard deviation, flatten delta. Conditions per TOMIC: IV > ATR, flat put skew with steep call skew, 10–30 DTE, targeting 5–10% returns fast1.
  • Long butterfly (debit): buy lower strike, sell 2× middle, buy higher strike (calls or puts). Very cheap when the middle strike is far from the money.
  • Broken-wing: offsets the middle strike asymmetrically so one wing is wider — eliminating or flipping the debit/credit and skewing the risk tail.

Payoff Table

Iron butterfly on a 100 stock — short 100 straddle, wings at 95/105, credit 4.00:

Price at expiry P&L
Exactly 100 +4.00 (max profit)
96 / 104 (breakevens) 0.00
≤ 95 or ≥ 105 −1.00 (max loss = wing width − credit)

Long 95/100/105 call butterfly bought for 1.00: max profit 4.00 at 100, max loss 1.00 beyond the wings.

Greeks Profile

Greek Iron butterfly (short) Long butterfly (debit)
Delta ~flat at entry; grows fast near the body Small until near expiry
Gamma Most negative at the body Most positive near the body
Theta Strongly positive — decays fast in final weeks Negative
Vega Negative Positive

Versus the condor: same sign structure, but all greeks are concentrated at one strike, so theta income and gamma risk are both amplified1.

Best Regime / Market View

  • "Price lands here": a specific, near-term target — pin-prone expirations, post-event drift to a magnet level, or a known confluence level.
  • Iron butterflies want IV rich and movement quiet immediately; condors tolerate a wider profit window for less credit2.
  • Cheap long butterflies express a tail view for pennies — max profit is many multiples of the debit if the pin lands.

Primary Risks

  • Pin risk: max profit requires precision; being one strike away at expiry can mean the difference between full profit and near-full loss2.
  • Gamma blowup: near the body in the final week, small moves swing P&L violently — a tent break can go from profit to max loss quickly (TOMIC: exit if the trade breaks the tent; tighten wings at 10%1).
  • Assignment/expiration mechanics on ITM legs around the body.
  • Broken-wing variants: one side has an uncapped-looking (widened) loss zone until the wing engages.

Management Levers

  • Close before the final week to avoid pin-lottery dynamics; take 5–10% fast gains per TOMIC practice1.
  • Convert a tested iron butterfly side into a kite or fly — adjustment spreads that buy back gamma cheaply1.
  • Widen wings post-entry (turning into a broken-wing condor) to relieve a trending market.
  • On long flies: sell when most of the value is captured, rather than gambling the pin.

Variants

  • Broken-wing butterfly: asymmetric wings for skewed payoff or zero-cost entry.
  • Directional butterfly: body placed at a price target away from spot — the classic cheap-tail usage2.
  • Iron fly vs. condor: single body vs. two bodies — the profit-vs-probability dial.
  • Skip-strike fly / christmas tree: wider structures resembling backspread hybrids.

Links

Source Notes

  1. TOMIC ATM iron butterfly conditions and management, ../option-traders-hedge-fund-bundle/topics/strategies.md. ↩↩↩↩↩↩

  2. Trading Option Greeks, wing spreads and directional butterflies, ../trading-option-greeks/topics/spreads.md. ↩↩↩↩

  3. Natenberg butterfly as short-volatility spread, ../option-volatility-and-pricing-bundle/topics/spreads.md. ↩