What is a long put butterfly?
A long put butterfly buys one put below and one above the market and sells two in between. The result is the call butterfly's payoff curve: maximum gain exactly at the middle strike, maximum loss equal to the debit paid, and two break-evens in between.
Key takeaways
- The payoff matches the long call butterfly exactly.
- The maximum loss is the debit; the maximum gain exists only at the middle strike.
- The real decision is a price question: which version is cheaper right now?
- As on the call version, time works for you despite the debit.
The question to answer before you open the trade: Which version is cheaper to get filled right now - the call or the put construction?
A simple mental model: the same guess at two stalls
At the village fair a pumpkin sits on a scale, and whoever guesses its weight wins. A guess costs 1.50 €. Get the weight exactly right and the stallholder pays you 5 €. Come close and you get less. Miss badly and your stake is gone — just the stake, whether you were off by 500 grams or by 20 kilos.
Now the part that matters here: two stalls sell exactly the same guess. One charges 1.50 €, the other 1.65 €. The pumpkin weighs what it weighs, and both stalls pay out the same.
Four things follow, and together they are the whole put butterfly:
- You pay a small amount you know in advance, and that is the most you can lose.
- The full payout exists at one number, not across a band around it.
- Past a certain distance, missing by more changes nothing.
- Because both stalls deliver the same thing, the only real decision is which one you buy from.
Where the picture ends: the pumpkin is weighed once and then it is over. Your guess on the market has a price every day, and you can sell it on early instead of waiting for the weighing. The two stalls also reprice constantly — one can be cheaper in the morning and the other by lunchtime. And the value of your guess only builds shortly before the weighing: for the weeks before that, it looks like nothing is happening at all.
How does a long put butterfly work?
It works exactly like its call counterpart. You sell two puts at the middle strike and buy one above and one below. Because the two sold puts hold more extrinsic value — the part of an option's price that is there purely for waiting — than the two bought wings, you end up selling more time value than you buy, even though the position costs money overall.
The driver is therefore time decay: while price stays near the middle strike, the sold puts lose value faster than the bought ones, and that difference is yours.
What works against you is movement in either direction. Once price leaves the band between the outer strikes, the position is out its debit — no more than that, but no less either.
The interesting thing about this strategy is not its mechanics but its relationship to the call butterfly. At the same strikes, both constructions produce identical results. In practice that means you have the same thesis available twice, and should take the cheaper one.
If you remember one thing: the question is not calls or puts, it is which of the two prices is better right now.
How is a long put butterfly constructed?
- +1 Put @K+W
- -2 Put @K
- +1 Put @K-W
The order of the legs is mirrored against the call version — bought above and below, sold twice in the middle. The result is the same.
Wing width is the dial here too. A wide butterfly costs more and leaves more room; a narrow one costs almost nothing and demands precision. The middle belongs on your price target, not where the premium looks prettiest.
Worked example
An example stock trades at 100 €. You buy the 105 € put, sell two 100 € puts and buy the 95 € put, paying a net 1.50 € per share, or 150 € per contract. The wing width is 5 €.
| Figure | Value |
|---|---|
| Long put | 105 € |
| Short puts (2×) | 100 € |
| Long put | 95 € |
| Wing width | 5 € |
| Debit paid | 1.50 € |
| Lower break-even | 96.50 € |
| Upper break-even | 103.50 € |
| Maximum loss | 1.50 € per share (150 €) |
| Maximum profit | 3.50 € per share (350 €), only at 100 € |
Maximum loss: 1.50 € per share, or 150 € per contract — the debit, reached at or below 95 € and at or above 105 €.
Maximum profit: 3.50 € per share, or 350 € per contract — the wing width less the debit, only exactly at 100 €. At 102 € it is 1.50 €; at 103.50 € it is nothing.
Break-evens: 96.50 € and 103.50 € — the lower strike plus the debit, the upper strike less the debit.
These numbers are deliberately identical to the ones on the long call butterfly page, because that is the point: at the same strikes and the same debit, the two positions are indistinguishable in outcome.
Where they differ is the price the market quotes. If the call butterfly trades at 1.50 € and the put butterfly at 1.65 €, the wrong choice costs 15 € per contract — on a 150 € stake, ten percent of the risk for exactly the same result. That gap comes from volatility skew and from unequal liquidity across the two sides of the chain, and against a butterfly's small stake it is rarely negligible.
When is a long put butterfly worth it?
- Market phases it suits
The same conditions as the call version: a sideways market or the calm after a volatility spike, plus a specific price target rather than a mere range.
On volatility it wants high implied volatility, because the two sold puts in the middle then bring in more and the debit falls. Put-side skew cuts both ways here: it makes the lower bought put dearer while also making the sold middle more valuable. Which effect dominates is settled by the actual quote — which is why comparing against the call version is not a formality but the real work before entry.
Its purposes are speculation and trading volatility.
The greeks on a long put butterfly
| Greek | Sign |
|---|---|
| Delta | ~ |
| Gamma | - |
| Theta | + |
| Vega | - |
Short version: delta near zero, negative gamma, positive theta, negative vega — identical to the call version. Positive theta on a paid-for position is again the unusual part, and the negative gamma is what makes the position react most violently right before expiration.
Management
| Profit target | 25-50% of the maximum gain |
|---|---|
| Loss limit | the debit |
| Time rule | the value shows up close to expiration |
As on the call butterfly, the time rule is inverted: the value only appears close to expiration. The first weeks look like nothing is happening, and that is the expected path.
The 25–50 % profit target is arithmetic rather than modesty. The full amount exists at one point; everything below it is a curve whose steepest stretch falls in the last few days, alongside the largest gamma risk.
The loss limit is the debit itself. The position cannot cost more, which makes the number of contracts the only variable you genuinely control here.
Assignment and capital
- Assignment risk
- medium
- Capital required
- very low (equal to the debit)
- Typical expiration
- 20-45
- Typical delta
- centered on the price target
The assignment risk is medium and sits on the two sold puts in the middle. Early exercise lands 200 shares in the account with the full purchase price due — 20,000 € at a 100 € strike, many times the 150 € stake. The bought puts cover the value, but the stock position has to be unwound. On puts, the probability of early exercise rises once they are deep in the money with little extrinsic value left.
The capital requirement is very low and equals the debit. As on the call version that is both the appeal and the temptation: a 150 € stake invites trading ten contracts, at which point it is no longer a small trade.
What a long put butterfly does not mean
- The maximum gain is not a result you can plan around. The 350 € exists at exactly 100 € and only at expiration. What you realistically take is a slice of the curve — hence the usual targets of 25 to 50 percent of the maximum.
- "Put" is not a statement about direction. The option type only says what the structure is built from. The position turns bearish when you move all three strikes down, not when you build it from puts.
- The same payoff curve does not mean the same price. What is identical is the outcome, not the bill at the till. That gap between the call and put versions is the entire reason this page exists.
- A small debit says nothing about the odds. 150 € risked for up to 350 € sounds like a good ratio. It is the price of a very narrow target — the market is not handing anything over here.
- Being inside the wings is not the same as being in profit. At 96 € the stock sits between the outer strikes and the position is still down. Profit starts at the 96.50 € break-even.
Which mistakes cost money on a long put butterfly?
Did not compare the two versions. The most expensive error here, because it is entirely avoidable. Call and put butterflies deliver the same result; taking the dearer one gives away part of the return for nothing. Pull up both quotes before ordering.
Opened too early. The same applies as on the call version: a butterfly with 60 days left barely moves. The weeks where nothing happens are part of the construction, not its failure.
Three legs in thin liquidity. Three strikes mean three bid-ask spreads. On a 150 € stake, a poor fill eats a double-digit percentage immediately. Always order as a combination.
Read the name as a directional statement. "Put butterfly" sounds bearish and is not. Direction lives in where the three strikes sit, not in the option type. Placing the middle on the current price builds a neutral position, whether it is made of puts or calls.
Feynman check: explain a put butterfly without jargon
Explain to someone in three sentences what you are doing. Do it without the words "strike", "debit", "skew" and "volatility".
Your explanation is complete when it contains four things:
- Which single price are you betting on, and what happens if it is missed narrowly?
- What is the most this trade can cost you?
- Why does it make no difference to the outcome whether you build it from puts or from calls?
- Given that, how do you decide which of the two to buy?
One possible explanation: "I put 150 € on the stock being at exactly 100 € on a particular day. If it lands there, I am paid 500 €, so 350 € more than I put in; the further off it lands the less I get, and eventually nothing. The most I can lose is my 150 €. The same bet is sold at two counters, and I take whichever one is charging less today."
If your explanation says you are betting on falling prices because puts are involved, that is exactly where the gap is. Go back to the worked example: the numbers are line for line the same as on the call butterfly, and direction lives solely in where the three strikes sit.
Five questions before you enter
- Which specific price do I expect on expiration day — and what am I basing it on?
- What does this construction cost right now as a call butterfly, and what as a put butterfly?
- Which side of the option chain has the tighter bid-ask spreads?
- Am I willing to hold this until shortly before expiration, through weeks in which nothing happens?
- How many contracts am I trading — and would that total still be acceptable if it were lost in full?
Long Put Butterfly or Long Call Butterfly: what is the difference?
This data-driven table lays out the differences that actually matter between Long Put Butterfly and Long Call Butterfly.
| Criterion | Long Put Butterfly | Long Call Butterfly |
|---|---|---|
| Market phase | Range-bound, no trend, price oscillating between levels or After a volatility spike, with a return to normal expected | Range-bound, no trend, price oscillating between levels or After a volatility spike, with a return to normal expected |
| What pays you | Time decay | Time decay |
| Risk defined | Yes | Yes |
| Max profit | the spread width minus the debit paid | the spread width minus the debit paid |
| Max loss | the debit paid | the debit paid |
| Capital required | very low (equal to the debit) | very low (equal to the debit) |
| Approval level | 3 | 3 |
In short: Long Put Butterfly fits when the market phase is Range-bound, no trend, price oscillating between levels or After a volatility spike, with a return to normal expected and the goal is Speculation or Trading volatility; Long Call Butterfly fits when the market phase is Range-bound, no trend, price oscillating between levels or After a volatility spike, with a return to normal expected and the goal is Speculation or Trading volatility.
Related strategies
These strategies solve a similar problem — the counter position is the inverse.
Understanding the Long Put Butterfly is the start. Journaling is what makes the difference.
Log your Long Put Butterfly trades and connect strategy, sizing and emotion to what actually happened.
Start freeNo credit card needed • Cancel any time
Frequently asked questions
Is a long put butterfly the same as a long call butterfly?
In outcome, yes. At the same strikes and expiration both have the same payoff curve, the same break-evens and the same maximum gain. What differs is the route there and the price the market happens to be quoting for each version.
Why would I choose the put version at all?
Because it is sometimes cheaper to get filled. Volatility skew prices puts and calls differently, and liquidity is rarely equal on both sides of the chain. Compare both debits before every entry — against the small stake of a butterfly, the difference is often material.
Where are the break-evens on a long put butterfly?
At the lower strike plus the debit and the upper strike less the debit — the same formulas as the call version. With strikes at 95/100/105 and a 1.50 € debit, that is 96.50 € and 103.50 €, with the maximum gain exactly at 100 €.
Is a put butterfly better when prices are falling?
No. Both versions are direction-neutral and bet on a particular price rather than a direction. The name only says which option type the structure is built from. A bearish view is expressed by moving all three strikes down, equally in either version.
How large is the assignment risk?
Medium, and it sits on the two sold puts in the middle. Early exercise puts 200 shares in the account that have to be paid for. The bought puts cover the value, but the stock position still has to be unwound. On puts the probability rises once they are deep in the money with little extrinsic value left.
Next up: the table of all option strategies, or the strategy finder.
Sources
This material is general information about option strategies, written for a general audience. It is not investment advice, not a recommendation, and not financial analysis. Options can lose their entire value, and uncovered positions can lose more than the amount committed. Anything said about tax is general in nature and is no substitute for professional tax advice. Last reviewed: 2026-08-06.