Put Butterfly

A put butterfly is the mirror image of a call butterfly: same tent-shaped payoff, same defined risk, same precision bet on a pinned target price — just constructed with puts instead of calls. The two structures produce identical P&L at expiration, so the choice between them comes down to liquidity: use whichever chain has tighter bid-ask spreads at your target strikes.

The structure

A put butterfly uses three equidistant strikes and four contracts total — the same framework as a call butterfly, reversed:

• Buy 1 higher-strike put — the deep leg that provides intrinsic value if the stock falls toward the center.
• Sell 2 middle-strike puts — the body of the butterfly, defining your target price.
• Buy 1 lower-strike put — the lower wing that caps risk if the stock drops through.

Equal strike spacing is required. You pay a net debit. Max profit occurs when the stock closes exactly at the middle strike at expiration, and max loss is limited to the debit paid.

Worked example

Stock: MSFT at $420. You believe MSFT will consolidate near $420 through the next monthly expiration. You build a put butterfly centered at $420 with $5 wings, 30 DTE:

• Buy 1 × $425 put @ $8.50
• Sell 2 × $420 puts @ $5.80 each ($11.60 total)
• Buy 1 × $415 put @ $3.70
• Net debit: $8.50 + $3.70 − $11.60 = $0.60 ($60 per butterfly)
• Max profit: $5.00 − $0.60 = $4.40 ($440 per butterfly)
• Max loss: $0.60 ($60 per butterfly)
• Lower breakeven: $415 + $0.60 = $415.60
• Upper breakeven: $425 − $0.60 = $424.40
• Risk-reward ratio: risk $60 to make $440 (7.3:1)

If MSFT pins at $420 at expiration, the $425 put is worth $5, both $420 puts expire worthless, and the $415 put expires worthless. You keep $5.00 − $0.60 = $4.40 profit. Outside the breakevens, you lose some or all of the debit.

Put butterfly vs. call butterfly

At the same strikes and expiration, a put butterfly and call butterfly produce the same payoff. The differences are practical: check which chain has tighter bid-ask at your strikes, consider early-assignment risk on the short legs (especially near ex-dividend), and note that put skew can make the put version slightly more expensive with a correspondingly higher max profit. The net effect is usually negligible — use whichever chain fills better.

When to use it

• Same scenarios as the call butterfly. Specific price target, pin expectation, low-cost speculation. The only reason to choose puts over calls is better liquidity or a slight pricing edge from skew.
• Hedging put-heavy portfolios. If you already hold a lot of long calls and want a neutral pin bet, using puts avoids adding more call exposure to your book.
• Index options. SPX and NDX are European-style (no early assignment), so the put and call butterfly are truly interchangeable. Use whichever has better fills at the moment.
• Any IV environment. Like the call butterfly, the put butterfly is not heavily IV-dependent. The debit is smaller in low IV, but the structure works across regimes.

How Tradient ranks them

The scanner evaluates every three-strike put combination at equal spacing, using the same scoring framework as the call butterfly scanner. Key factors:

• Debit-to-max-profit ratio. Lower debit relative to max payout ranks higher.
• Probability of touching the body.Estimated probability the stock trades within the breakevens during the trade’s life.
• Liquidity. Bid-ask spread across all three put strikes. Wider markets are penalized.
• Call vs. put comparison. When both a call butterfly and put butterfly target the same center strike, Tradient highlights whichever offers the better net debit after slippage.

Managing the trade

Take profits at 25-50% of max

The butterfly payoff is a sharp tent. Once you have 25-50% of the theoretical max, the remaining gains require an increasingly precise pin. Close and redeploy the capital.

Close if the stock leaves the zone

If the stock moves beyond the breakevens with weeks remaining, close for residual value. The butterfly’s value outside the body is small and shrinking — waiting for a reversal usually means watching the debit decay to zero.

Avoid adjustments

Rolling a put butterfly to a new center strike is expensive in slippage (you’re closing four legs and opening four new ones). If the target has moved, close the trade and build a fresh butterfly at the new level.

Common mistakes

• Choosing puts over calls without checking liquidity.The default should be whichever chain has tighter markets at your strikes. Don’t default to puts out of habit.
• Expecting max profit. Same as the call butterfly — the exact pin is rare. Set a realistic profit target and honor it.
• Ignoring early assignment on short puts. If the stock drops and your short puts go deep ITM, you may be assigned early. Use European-style index options (SPX, NDX) to eliminate this risk entirely.
• Wings too wide or too narrow. Too wide increases the debit and needs more precision. Too narrow gives minimal profit potential. Match the wing width to the expected range of the stock — $5 wings on a $100-500 stock is a reasonable starting point.
• Holding into expiration week.Gamma risk spikes in the final days. The P&L can swing from full profit to full loss on a $2 move. Close with at least 5 DTE remaining.

Where to go next

• Call butterfly — the identical structure using calls. Compare liquidity and use the better chain.
• Iron butterfly — the credit version: sell an ATM straddle, buy wings. Higher probability, different risk profile.