Long put butterfly
A systematic options approach—Long put butterfly—defined by explicit rules, testable on history, and fragile when costs or regimes change.
Overview
This is a sideways strategy consisting of a long position in an OTM put option with a strike price K1, a short position in two ATM put options with a strike price K2, and a long position in an ITM put option with a strike price K3. The strikes are equidistant: K3−K2 =K2−K1 =κ.
Long put butterfly sits in the Options chapter of the systematic catalog. On QUSXFI we treat it as a testable hypothesis: specify entries, exits, sizing, and costs—then ask whether edge survives out-of-sample scrutiny.
Discretionary traders often arrive at similar ideas intuitively; the quantitative version forces you to write the rule before you see the next bar. That discipline is what makes results reproducible—or exposes them as luck.
Based on the research catalog 151 Trading Strategies (Kakushadze & Serur, 2018), section 2.41. Educational summary—not a replication of the full formal definition.
Multi-Leg Payoff Logic
Long put butterfly stacks several legs to sculpt a non-linear payoff—each leg adds margin, commission, and failure mode.
Map every input Long put butterfly needs in Options—prices, vol surfaces, fundamentals, or legal milestones—and verify point-in-time integrity.
Implementation and Research Process
Script Long put butterfly as a single transaction with max leg slippage tolerances—one missed leg is naked risk.
Walk-forward or hold-out test Long put butterfly; report turnover, max drawdown, and exposure—not CAGR alone.
Document Long put butterfly capacity in Options: intended participation versus average daily volume.
Risk: What Breaks This Strategy
Multi-leg structures (Long put butterfly) multiply commission, margin, and operational error. One leg fills, another does not—you are suddenly naked risk.
Small moves in spot and vol interact nonlinearly; a 'defined risk' label does not mean defined stress behavior.
Adjustments mid-trade often become discretionary—exactly what systematic rules tried to avoid.
Common Mistakes to Avoid
- Deploying Long put butterfly live before paper trading through at least one adverse Options month.
- Stacking Long put butterfly with correlated sidebar strategies without netting exposures.
- Changing Long put butterfly parameters after each losing week—implicit discretion destroys reproducibility.
- Erasing losing Long put butterfly months instead of documenting regime breaks—that is how research firms stop learning.
How to Study This Strategy
- Restate Long put butterfly (§2.41) as numbered rules another researcher could implement cold.
- Map Long put butterfly to Basic Trading chart concepts you will use as filters—not as substitutes for rules.
- Write a one-page Long put butterfly failure memo: three break modes and early warning signs.
- List every data field Long put butterfly needs in Options; verify point-in-time integrity.
- Add conservative costs to Long put butterfly; rerun with 2× spreads and compare drawdown paths.
Key Takeaways
- Long put butterfly multiplies legs, margins, and operational failure modes—one missed fill creates naked exposure.
- Document adjustment rules for Long put butterfly in advance; mid-trade discretion destroys systematic claims.
- Commission and slippage scale with leg count—net edge often lives or dies on costs.
- Small spot-vol moves interact nonlinearly; stress jointly, not one greek at a time.
- Paper-trade Long put butterfly with full leg fills simulated at bid/ask before debating live capital.
Learning Tip
Build a 'Long put butterfly' research memo: hypothesis, universe, parameters, costs, kill switches—edit it before every tweak.
Explore related strategies in the sidebar or return to the full catalog.