How are XBI butterfly max profit and max loss calculated?

Max profit equals the wing width minus net debit times 100 (reached when the underlying pins the middle strike); max loss equals the net debit times 100. Two breakevens at lower-wing plus debit and upper-wing minus debit. For the XBI butterfly priced from the end-of-day chain at a 30-day expiry (ATM IV 29.50%), the computed maximum profit is $454.23 per contract and the computed maximum loss is -$141.50 per contract. Live intraday quotes will differ as the chain moves through the trading session.

What is the breakeven for a XBI butterfly?

The breakeven for the XBI butterfly priced on this page is roughly $125.92 and $136.09 at expiration, derived from end-of-day chain premiums. Breakeven is the underlying price at which the strategy's P&L crosses zero ignoring transaction costs and assignment risk. The current XBI market-implied 1-standard-deviation expected move is approximately 8.46%; if the move sits well outside the breakeven distance, the structure's risk-reward becomes correspondingly tighter.

How does current XBI implied volatility affect this butterfly?

XBI ATM IV is at 29.50% with IV rank near 37.57%, which is mid-range against its 1-year history. Strategy selection depends more on directional thesis and expected move than on a strong IV signal.

XBI Butterfly Strategy

XBI (State Street SPDR S&P Biotech ETF), in the Financial Services sector, (Asset Management industry), listed on AMEX.

The State Street SPDR S&P Biotech ETF seeks to provide investment results that, before fees and expenses, correspond generally to the total return performance of the S&P Biotechnology Select Industry Index (the "Index")Seeks to provide exposure to the Biotechnology segment of the S&P TMI, which comprises the following sub-industries: BiotechnologySeeks to track a modified equal weighted index which provides the potential for unconcentrated industry exposure across large, mid and small cap stocksAllows investors to take strategic or tactical positions at a more targeted level than traditional sector based investing

XBI (State Street SPDR S&P Biotech ETF) trades in the Financial Services sector, specifically Asset Management, with a market capitalization of approximately $8.35B, a beta of 1.09 versus the broader market, a 52-week range of 75.71-139.19, average daily share volume of 9.4M, a public-listing history dating back to 2006. These structural characteristics shape how XBI etf options price implied volatility around earnings windows, capital events, and macro-driven sector rotations.

A beta of 1.09 places XBI roughly in line with broader market moves, so the strategy payoff and realized volatility track the index-equivalent baseline. XBI pays a dividend, which adjusts put-call parity and shifts the ex-dividend pricing across the listed chain.

What is a butterfly on XBI?

A long call butterfly buys one lower-strike call, sells two ATM calls, and buys one higher-strike call, paying a small net debit for a defined-risk position that maxes out if the underlying pins the middle strike at expiration.

Current XBI snapshot

As of May 15, 2026, spot at $130.88, ATM IV 29.50%, IV rank 37.57%, expected move 8.46%. The butterfly on XBI below is built from the same end-of-day chain, with strikes snapped to listed contracts and premiums pulled from the bid/ask midpoint at a 28-day expiry.

Why this butterfly structure on XBI specifically: XBI IV at 29.50% is mid-range versus its 1-year history, so strategy selection should anchor more to the directional thesis than to the IV regime, with a market-implied 1-standard-deviation move of approximately 8.46% (roughly $11.07 on the underlying). The 28-day window matched to the front-month expiry keeps theta exposure bounded while still capturing the post-snapshot move; longer-dated XBI expiries trade a higher absolute premium for lower per-day decay. Position sizing on XBI should anchor to the underlying notional of $130.88 per share and to the trader's directional view on XBI etf.

XBI butterfly setup

The XBI butterfly below is built from the end-of-day chain, with each option leg priced at the bid/ask midpoint of its listed strike. With XBI near $130.88, the first option leg uses a $124.50 strike; additional legs (when the strategy has them) anchor to spot-relative offsets. Premiums come from the bid/ask midpoint on the listed XBI chain at a 28-day expiry; the cross-strike IV skew is reflected directly in the per-leg values rather than approximated. Quantity sizing assumes one contract per option leg (or 100 XBI shares for the stock leg in covered calls and collars).

Action	Type	Strike / Basis	Premium (est)
Buy 1	Call	$124.50	$8.68
Sell 2	Call	$131.00	$4.55
Buy 1	Call	$137.50	$1.84

XBI butterfly risk and reward

Net Premium / Debit: -$141.50
Max Profit (per contract): $454.23
Max Loss (per contract): -$141.50
Breakeven(s): $125.92, $136.09
Risk / Reward Ratio: 3.210

Max profit equals the wing width minus net debit times 100 (reached when the underlying pins the middle strike); max loss equals the net debit times 100. Two breakevens at lower-wing plus debit and upper-wing minus debit.

XBI butterfly payoff curve

Modeled P&L at expiration across a range of underlying prices for the butterfly on XBI. Each row is one sampled price point from the computed payoff curve; the full curve uses 200 price points internally before being summarized into 10 rows here.

Underlying Price	% From Spot	P&L at Expiration
$0.01	-100.0%	-$141.50
$28.95	-77.9%	-$141.50
$57.88	-55.8%	-$141.50
$86.82	-33.7%	-$141.50
$115.76	-11.6%	-$141.50
$144.70	+10.6%	-$141.50
$173.63	+32.7%	-$141.50
$202.57	+54.8%	-$141.50
$231.51	+76.9%	-$141.50
$260.44	+99.0%	-$141.50

When traders use butterfly on XBI

Butterflies on XBI are pinning bets - traders use them when they expect XBI to settle near a specific level at expiration (often the prior close, a round number, or the max-pain strike) and want defined-risk exposure to that outcome.

XBI thesis for this butterfly

The market-implied 1-standard-deviation range for XBI extends from approximately $119.81 on the downside to $141.95 on the upside. A XBI long call butterfly is a pinning play: it pays maximum at the middle strike if XBI settles there at expiration, with the wing legs capping both the cost and the maximum loss to the net debit. Current XBI IV rank near 37.57% is mid-range against its 1-year distribution, so the IV signal is neutral; the butterfly thesis on XBI should anchor more to the directional view and the expected-move geometry. As a Financial Services name, XBI options can move on sector-level news flow (peer earnings, regulatory updates, industry-specific macro data) in addition to XBI-specific events.

XBI butterfly positions are structurally neutral / pin (limited-risk, limited-reward); the modeled P&L assumes European-style exercise at expiration and ignores early assignment, transaction costs, dividends paid before expiry on the stock leg (when present), and the bid-ask spread on the listed chain. XBI positions also carry Financial Services sector concentration risk; news flow inside the sector (peer earnings, regulatory shifts, supply-chain headlines) can move XBI alongside the broader basket even when XBI-specific fundamentals are unchanged. Always rebuild the position from current XBI chain quotes before placing a trade.

Frequently asked questions

What is a butterfly on XBI?: A butterfly on XBI is the butterfly strategy applied to XBI (etf). The strategy is structurally neutral / pin (limited-risk, limited-reward): A long call butterfly buys one lower-strike call, sells two ATM calls, and buys one higher-strike call, paying a small net debit for a defined-risk position that maxes out if the underlying pins the middle strike at expiration. With XBI etf trading near $130.88, the strikes shown on this page are snapped to the nearest listed XBI chain strike and the premiums come straight from the end-of-day bid/ask midpoint.
How are XBI butterfly max profit and max loss calculated?: Max profit equals the wing width minus net debit times 100 (reached when the underlying pins the middle strike); max loss equals the net debit times 100. Two breakevens at lower-wing plus debit and upper-wing minus debit. For the XBI butterfly priced from the end-of-day chain at a 30-day expiry (ATM IV 29.50%), the computed maximum profit is $454.23 per contract and the computed maximum loss is -$141.50 per contract. Live intraday quotes will differ as the chain moves through the trading session.
What is the breakeven for a XBI butterfly?: The breakeven for the XBI butterfly priced on this page is roughly $125.92 and $136.09 at expiration, derived from end-of-day chain premiums. Breakeven is the underlying price at which the strategy's P&L crosses zero ignoring transaction costs and assignment risk. The current XBI market-implied 1-standard-deviation expected move is approximately 8.46%; if the move sits well outside the breakeven distance, the structure's risk-reward becomes correspondingly tighter.
When should you consider a butterfly on XBI?: Butterflies on XBI are pinning bets - traders use them when they expect XBI to settle near a specific level at expiration (often the prior close, a round number, or the max-pain strike) and want defined-risk exposure to that outcome.
How does current XBI implied volatility affect this butterfly?: XBI ATM IV is at 29.50% with IV rank near 37.57%, which is mid-range against its 1-year history. Strategy selection depends more on directional thesis and expected move than on a strong IV signal.