An options strategy consisting of buying an additional lower strike price put option on a bull put spread in order to transform the position from a bullish strategy to a volatile strategy.
The Short Put Ladder Spread, also known as the Bull Put Ladder Spread, is an improvement to the Bull Put Spread, transforming it from an options strategy that profits only when the underlying stock goes upwards into a volatile strategy that profits when the underlying stock goes upwards or downwards with unlimited profit potential to downside.
This tutorial shall explain what the Short Put Ladder Spread is, its calculations, pros and cons as well as how to profit from it.
Find Options Strategies With Similar Risk Profiles 
Type of Strategy : Volatile

Type of Spread : Vertical Spread

Debit or Credit : Credit
The Short Put Ladder Spread is part of the "Ladder Spreads" family. Ladder Spreads add an additional further out of the money option on top of two legged spreads, stepping the position up by another strike price. The use of progressively higher or lower strike prices in a single spread gave "Ladder Spreads" its name.
The Short Put Ladder Spread could be used when the underlying stock is expected to remain stagnant, rise moderately or drop significantly.
Short Put Ladder is made up of writing an At The Money (or slightly ITM or OTM) Put Option, buying an equivalent amount of a lower strike price Out Of The Money Put Option and then buying yet another equivalent amount of an even lower strike price out of the money put option.
Sell ATM Put + Buy OTM Put + Buy Lower Strike OTM Put
Short Put Ladder Spread ExampleAssuming QQQ trading at $44. 
Short Leg
The short leg of a Short Put Ladder Spread is usually the At The Money option or a strike price that is nearest the money. This is because the primary profit of a Short Put Ladder Spread, which is the net credit of the position made when the underlying stock remains stagnant or moves upwards, requires as high an extrinsic value as possible and At The Money options contain the highest extrinsic value within the same expiration month.
Middle Strike Price
The closer the middle strike price is to the strike price of the short leg, the more expensive it is and the lower the resultant net credit becomes. This results in a lower profit when the underlying stock remains stagnant or moves upwards but also a lower maximum loss. The further the middle strike price is to the short leg, the higher the net credit becomes, resulting in a higher profit when the underlying stock remains stagnant or moves upwards and also a higher maximum loss.
A Level 4 options trading account that allows the execution of credit spreads is needed for the Short Put Ladder Spread. Read more about Options Account Trading Levels.
Short Put Ladder Spread profits in all 3 directions; When the underlying stock goes upwards (strongly or moderately), remains stagnant or goes downwards strongly. Indeed, the Short Put Ladder Spread has made profitable 4 out of 5 possible outcomes which makes its probability of profit extremely high.
For the stagnant and upwards movement, the Short Put Ladder Spread profits primarily through the net credit gained from writing the higher extrinsic value ATM put options and buying cheaper OTM put options. As long as the price of the underlying stock remains above the strike price of the ATM put options, the net credit is made as profit.
Maximum Upside Profit = Net Credit
Maximum Downside Profit = Unlimited
Maximum Loss = Short Put Strike  Higher Long Put Strike  Net Credit
Short Put Ladder Spread CalculationsFollowing up on the above example, assuming QQQQ at $46.50 at expiration. Wrote the JAN 44 Put for $1.50 Bought the JAN 42 Put for $0.50 Bought the JAN 41 Put for $0.15 Net Credit = $1.50  $0.50  $0.15 = $0.85 Maximum Loss = 44  42  0.85 = $1.15 Max. Upside Profit = $0.85 Max. Downside Profit = Unlimited 
Maximum Upside Profit : Limited to net credit received
Maximum Downside Profit: Unlimited (all the way to $0 stock price)
Maximum Loss: Limited
There are 2 break even points to a Short Put Ladder Spread. Loss will occur if the underlying stock closes within the upper and lower breakeven point by expiration.
Upper BEP: Short Put Strike  Net Credit
Lower BEP: Lower Long Strike  Strike difference between short put and higher long put + Net Credit
Short Put Ladder Spread Breakeven Points CalculationUpper BEP = $44  $0.85 = $43.15 Lower BEP = $41  ($44  $42) + $0.85 = $39.85 
Delta : Positive
Delta of Short Put Ladder Spread is positive at the start. As such, its value will increase as the price of the underlying stock increases. The short put ladder spread can start in delta neutral or slightly delta negative as expiration becomes longer.
Gamma : Negative
Gamma of Short Put Ladder Spread is negative for a start and will increase delta as the price of the underlying stock decreases, resulting in a downside loss. But shortly after, the Gamma of the Short Put Ladder Spread will begin to turn positive as the positive gamma of the two long put legs increase beyond the negative gamma of the short put leg. This will then decrease overall position delta into the negative allowing the position to profit to downside. The short put ladder spread can start in slightly positive gamma as expiration becomes longer.
Theta : Negative
Theta of Short Put Ladder Spread is negative for a start and will therefore lose value due to time decay in the short term prior to expiration as the long put legs lose value faster than the short put leg. However, as the short put leg contains more extrinsic value than the long put legs combined, theta will turn positive as expiration approaches, resulting in a profit even if the price of the underlying stock remains stagnant.
Vega : Increases with Length of Expiration
Vega of Short Put Ladder Spread can start slightly negative with near term options and increase to positive as longer expiration options are used. When this is the case, the position would profit on an increase in implied volatility, usually when the underlying stock declines.
:: Able to profit in 4 out of 5 possible moves in the underlying stock
:: Unlimited profit to downside
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