Bull put ladder
A systematic options approach—Bull put ladder—defined by explicit rules, testable on history, and fragile when costs or regimes change.
Overview
This is a vertical spread consisting of a short position in (usually) a close to ATM put option with a strike priceK1, a long position in an OTM put option with a strike price K2, and a long position in another OTM put option with a lower strike price K3. A bull put ladder typically arises when a bull put spread (a bullish strategy) goes wrong (the stock trades lower), so the trader buys another OTM put option (with the strike price K3) to adjust the position to bearish.
Bull put ladder 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 2.15. Educational summary—not a replication of the full formal definition.
Multi-Leg Payoff Logic
Bull put ladder stacks several legs to sculpt a non-linear payoff—each leg adds margin, commission, and failure mode.
Before backtesting Bull put ladder, write the economic hypothesis in one sentence a risk manager would accept or reject.
Implementation and Research Process
Stress Bull put ladder with joint spot and vol shocks; butterflies and condors fail at the short strike cluster.
Decompose Bull put ladder into signal, portfolio construction, and execution modules—each must be path-independent given the same historical tape.
Document Bull put ladder capacity in Options: intended participation versus average daily volume.
Risk: What Breaks This Strategy
Multi-leg structures (Bull put ladder) 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
- Stacking Bull put ladder with correlated sidebar strategies without netting exposures.
- Deploying Bull put ladder live before paper trading through at least one adverse Options month.
- Erasing losing Bull put ladder months instead of documenting regime breaks—that is how research firms stop learning.
- Calling Bull put ladder 'defined risk' while leaving one leg unfilled.
How to Study This Strategy
- Run a paper book on Bull put ladder for a full signal cycle; export trades and tag regimes manually.
- List every data field Bull put ladder needs in Options; verify point-in-time integrity.
- Restate Bull put ladder (§2.15) as numbered rules another researcher could implement cold.
- Add conservative costs to Bull put ladder; rerun with 2× spreads and compare drawdown paths.
- Compare Bull put ladder to one sidebar alternative net of costs—document why you chose this structure.
Key Takeaways
- Bull put ladder multiplies legs, margins, and operational failure modes—one missed fill creates naked exposure.
- Document adjustment rules for Bull put ladder in advance; mid-trade discretion destroys systematic claims.
- Butterflies and condors look cheap until spot parks on the short strike cluster.
- Small spot-vol moves interact nonlinearly; stress jointly, not one greek at a time.
- Paper-trade Bull put ladder with full leg fills simulated at bid/ask before debating live capital.
Learning Tip
Build a 'Bull put ladder' 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.