DocsStrategies

Iron Butterfly

Sell an ATM straddle and buy OTM wings. Higher credit than an iron condor but a narrower profit zone.

8 min readincomeneutraldefined riskshort volatility

An iron butterfly is a short straddle wrapped in protective wings. You sell the ATM call and ATM put (just like a straddle) then buy an OTM call and OTM put to cap the risk. The result is a higher credit than an iron condor — because the short strikes sit at-the-money — but a narrower profit zone. It’s the defined-risk income play for traders who want maximum premium when they believe the stock is pinned.

Outlook
Pinned. Expect stock to stay very close to current price.
Legs
4 (long OTM put, short ATM put, short ATM call, long OTM call)
Max loss
Defined: wing width − net credit
Max profit
Defined: net credit (higher than iron condor)
IV preference
High. ATM premium is rich when IV is elevated.
Best regime
Elevated VIX, no catalyst, low expected realized vol.

The structure

An iron butterfly is structurally identical to an iron condor with one key difference: the short strikes are both at-the-money instead of out-of-the-money. The four legs are:

  • Buy 1 OTM put (lower wing) — protection on the downside.
  • Sell 1 ATM put — collects the maximum put premium.
  • Sell 1 ATM call — collects the maximum call premium.
  • Buy 1 OTM call (upper wing) — protection on the upside.

Because the short strikes are ATM, the combined credit is significantly larger than an iron condor of the same wing width. The trade-off is that any movement away from the center strike immediately starts eating into your profit.

Worked example

Stock: QQQ at $380. IV rank is 58 and the market is rangebound. You sell the 35 DTE iron butterfly with $10 wings:

  • Buy $370 put @ $3.20
  • Sell $380 put @ $7.10
  • Sell $380 call @ $7.50
  • Buy $390 call @ $3.40
  • Net credit: $14.60 − $6.60 = $8.00 ($800 per butterfly)
  • Max loss: $10.00 − $8.00 = $2.00 ($200 per butterfly)
  • Upper breakeven: $380 + $8.00 = $388
  • Lower breakeven: $380 − $8.00 = $372
  • Max profit: $800 if QQQ pins exactly at $380

Compare this to a same-width iron condor: the condor might collect $2.50 on $10 wings (75% max-loss risk for $250 reward). The butterfly collects $8.00 but the profit zone is only $16 wide instead of the condor’s $30+. You trade width for density.

Iron butterfly vs. iron condor

The butterfly collects a much higher credit (ATM premium is richest) but has a narrower profit zone, lower POP, and lower max loss in dollar terms. Use the butterfly when you expect a tight pin; choose the condor when you expect a wider range.

When to use it

  • IV rank ≥ 50. The ATM straddle component needs rich premium to justify the structure. In low IV, the credit shrinks and the risk-reward degrades.
  • Strong pin expectation. If a stock has massive open interest at a single strike (common on monthly expirations), a butterfly centered there can exploit the magnetic pin effect.
  • No catalyst. Same rule as the iron condor — events cause the large moves that blow through the narrow profit zone.
  • When you want defined risk but more credit than a condor. The iron butterfly is the middle ground between the naked short straddle (unlimited risk, max credit) and the iron condor (defined risk, smaller credit).

How Tradient ranks them

The butterfly scanner uses the same framework as the iron condor scanner in backend/app/strategies/volatility.py, with the short strikes locked to the ATM level. It evaluates every wing width at each expiration, computing the credit, breakevens, and probability of profit. Key scoring factors:

  • Credit-to-width ratio. Higher ratios indicate richer premium relative to the defined risk.
  • POP. Even though butterflies have lower POP than condors, the score still favors setups where the profit zone covers a reasonable range.
  • IV rank. Elevated IV is rewarded heavily for this structure.
  • Open interest at center strike. A pin magnet boosts the score when open interest is concentrated.

Managing the trade

The 50% rule

Close when you’ve captured 50% of the max credit. On an $8.00 butterfly, that’s a buyback at $4.00 or less. The P&L curve is steep near the center — once you have 50%, the remaining gains require the stock to barely move for the rest of the expiration cycle.

Adjust if the stock drifts

If the stock moves $3-4 away from center with significant time remaining, consider closing the position and reopening a new butterfly centered at the current price. The original position is fighting delta exposure that worsens with every dollar of drift.

Don't hold to expiration
Iron butterflies have maximum gamma risk at expiration because the short strikes are ATM. A small move in the final hours can swing the P&L dramatically. Close at 50% or with at least 7 DTE remaining.

Common mistakes

  • Using when the stock is trending. A butterfly needs the stock to stay near center. If the stock has been trending for weeks, a condor with wider short strikes is a better fit.
  • Confusing wing width with iron condor width.In an iron condor, the distance between the two short strikes is your profit zone. In a butterfly, the short strikes are the same — the wing width determines your max loss, not your profit zone.
  • Expecting full max profit. Max profit requires an exact pin at expiration — a rare event. Target 50% of max and move on.
  • Wings too narrow. Narrow wings mean the credit is almost equal to the wing width, which sounds great until you realize the breakevens are extremely tight. Give yourself room.
  • Ignoring assignment risk. ATM short options have a real chance of early assignment, especially on stocks with dividends. Use index options (SPX, NDX) to avoid this.

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