Long Butterfly

Pinpoint bet on a specific strike at expiration. Outlook: neutral. Direction: debit. Risk: defined.

A long butterfly is a three-strike structure: long one lower-strike call, short two middle-strike calls, long one upper-strike call, with all three strikes equidistant. Net debit. The position achieves maximum profit if the underlying finishes exactly at the middle strike at expiration.

Butterflies are the highest-leverage structure for betting on a specific price level at a specific date. They have tiny debits relative to a large potential payoff, but require the underlying to actually pin the middle strike.

Worked example: a stock trades at $100. Open a 7 DTE 95/100/105 long-call butterfly: long one $95 call, short two $100 calls, long one $105 call. Net debit $0.50 per share ($50 per contract). Max profit at expiration is the $5 wing width minus $0.50 debit = $450, achieved only if the stock closes exactly at $100. Break-evens are $95.50 and $104.50; outside those, the trade caps at the $50 max loss. Realistic outcomes: a close at $99 retains roughly $400 of value (close to max but not exact); a close at $97 retains about $200; a close at $94 or $106 produces full max loss. The asymmetric debit-to-payoff ratio (1:9 in this example) is the structural appeal: butterflies pay outsized returns when a specific pin thesis works, and bound the loss at the small entry debit when it does not. The flip side is that pin precision is rare, and most butterflies expire near max loss or with only modest profit relative to the theoretical max.

Sizing and selection: butterflies are typically built on liquid index ETFs (SPY, QQQ) at well-known pin candidates such as max-pain strikes, round numbers, or prior session closes. Single-stock butterflies have wider bid-ask spreads on the four-leg execution, which can erase 20-40% of the theoretical edge before the trade even establishes. Most butterfly traders open positions at 7-14 DTE to capture the late-cycle gamma concentration at the middle strike, and close at any 30-50% profit rather than holding for the rare exact-pin payoff.

Break-Even

Two break-evens: lower-strike + net debit and upper-strike - net debit.

Max Profit

(Spread width - net debit) x 100 x contracts, achieved only if spot = middle strike at expiration.

Max Loss

Net debit x 100 x contracts, realized if spot finishes outside the outer strikes.

Risk Profile

Steep-tent P/L curve: starts at -debit at the lower wing, peaks at max profit at the middle strike, then descends back to -debit at the upper wing. Outside the wings, P/L is flat at -debit. The peak is sharp and narrow; small misses from the middle strike materially reduce the realized profit. Butterflies are the most "punctate" of the standard structures.

Greeks by Leg

Three-strike, four-leg structure (long 1 lower, short 2 middle, long 1 upper). Each individual leg contributes its own Greeks; the net is dominated by the two short middle calls. Net delta is near zero around the middle strike. Net gamma is sharply negative at the middle strike (the short calls dominate locally) and positive at the outer wings. Net theta is positive when spot is near the middle strike (short calls decay favorably) and slightly negative when spot is in the wings. Net vega is small; the structure is closer to vol-neutral than a single-leg position.

When to Use

• You have a specific price target at a specific expiration (e.g., max-pain pinning).
• Extremely asymmetric risk/reward on a pin trade: small debit, large possible payoff.
• Low-IV environment where premium is cheap.
• Specific thesis: "this stock will close within $2 of $100 on Friday."

IV-Rank Guidance: When to Enter

Butterflies favor low-IV-rank entry conditions. Cheap premium means the debit is small and the asymmetric reward-to-risk ratio is most attractive. Buying butterflies into elevated IV means paying for option time-value that decays away regardless of whether the pin happens. The strategy is also more attractive at shorter DTE (1-2 weeks) where the gamma at the middle strike has time to work and the time-value premium is small.

Common Pitfalls

• Max profit requires the underlying to pin the middle strike almost exactly, which is rare.
• Realistic profit is much less than the theoretical max on intraday or near-expiration moves.
• Any meaningful move in either direction kills the position.
• Bid-ask spreads on 4-leg structures can eat significant edge; execute as a multi-leg order.

Adjustments and Roll Logic

• If the underlying is approaching the middle strike with days remaining, take partial profits; the gamma risk on a small directional break is high near expiration.
• If the underlying is drifting toward one of the wings, consider rolling the wing in (closing the far wing, reopening closer to spot) to preserve some defined risk while updating the pin target.
• If the trade is at 50%+ of max profit before expiration, close; the asymmetric upside is rarely worth holding through pin-risk uncertainty.
• If both wings are far OTM with time remaining and the position has lost most of the debit, close at a small loss rather than wait for a low-probability recovery.

Frequently Asked Questions

How do I pick the middle strike?

For a max-pain trade, use the chain-wide max pain strike. For a pin-on-news trade, use the technical level you expect to attract price (round number, prior close, key Fibonacci). For a generic neutrality bet, use ATM. The strike choice IS the thesis; butterflies are unforgiving on misplaced pins.

What is the spread width?

Wider spreads have higher max profit but lower probability of pinning; narrower spreads have higher probability but smaller max profit. Common widths: $1-2 on liquid index ETFs, $5 on individual stocks. Match the width to the expected pin precision.

Iron butterfly vs regular butterfly: difference?

A regular butterfly is built with three strikes of one type (all calls or all puts) and is a debit trade. An iron butterfly is the credit-spread equivalent: short ATM straddle wrapped in a long strangle. Same P/L profile, different cashflow direction. Choice between them is platform-dependent and based on which has better spreads/fills.

When should I avoid butterflies?

Avoid butterflies when there is a known catalyst (earnings, FDA, FOMC) within the expiration window: the directional risk is too high for a pin trade. Also avoid butterflies on illiquid underlyings; the four-leg execution often delivers slippage that destroys the theoretical edge.

Try This on a Live Ticker

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