with interest and dividends can be isolated, and ultimately traded, when synthetic stock is combined with the underlying. There are two ways to combine synthetic stock with its underlying security: a conversion and a reversal.
Conversion
A conversion is a three-legged position in which a trader is long stock, short a call, and long a put. The options share the same month and strike price. By most metrics, this is a very flat position. A trader with a conversion is long the stock and, at the same time, synthetically short the same stock. Consider this from the perspective of delta. In a conversion, the trader is long 1.00 deltas (the long stock) and short very close to 1.00 deltas (the synthetic short stock). Conversions have net flat deltas.
The following is a simple example of a typical conversion and the corresponding deltas of each component.
Short one 35-strike call:
−0.63 delta
Long one 35-strike put:
−0.37 delta
Long 100 shares:
1.00 delta
0.00 delta
The short call contributes a negative delta to the position, in this case, −0.63. The long put also contributes a negative delta, −0.37. The combined delta of the synthetic stock is −1.00 in this example, which is like being short 100 shares of stock. When the third leg of the spread is added, the long 100 shares, it counterbalances the synthetic. The total delta for the conversion is zero.
Most of the conversion’s other greeks are pretty flat as well. Gamma, theta, and vega are similar for the call and the put in the conversion, because they have the same expiration month and strike price. Because the trader is selling one option and buying another—a call and a put, respectively—with the same month and strike, the greeks come very close to offsetting each other. For all intents and purposes, the trader is out of the primary risks of the position as measured by greeks when a position is converted. Let’s look at a more detailed example.
A trader executes the following trade (for the purposes of this example, we assume the stock pays no dividend and the trade is executed at fair value):
Sell one 71-day 50 call at 3.50
Buy one 71-day 50 put at 1.50
Buy 100 shares at $51.54
The trader buys the stock at $51.54 and synthetically sells the stock at $52. The synthetic price is computed as −3.50 + 1.50 − 50. Therefore, the stock is sold synthetically at $0.46 over the actual stock price.
Exhibit 6.8
shows the analytics for the conversion.
EXHIBIT 6.8
Conversion greeks.
This position has very subtle sensitivity to the greeks. The net delta for the spread has a very slightly negative bias. The bias is so small it is negligible to most traders, except professionals trading very large positions.
Why does this negative delta bias exist? Mathematically, the synthetic’s delta can be higher with American options than with their European counterparts because of the possibility of early exercise of the put. This anomaly becomes more tangible when we consider the unique directional risk associated with this trade.
In this example, the stock is synthetically sold at $0.46 over the price at which the stock is bought. If the stock declines significantly in value before expiration, the put will, at some point, trade at parity while the call loses all its time value. In this scenario, the value of the synthetic stock will be short at effectively the same price as the actual stock price. For example, if the stock declines to $35 per share then the numbers are as follows:
or
With American options, a put this far in-the-money with less than 71 days until expiry will be all intrinsic value. Interest, in this case, will not factor into the put’s value, because the put can be exercised. By exercising the put, both the long stock leg and the long put leg can be closed for even money, leaving only the theoretically worthless call. The stock-synthetic spread is sold at 0.46 and essentially bought at zero when the put is exercised. If the put is exercised before expiration, the profit potential is 0.46 minus the interest calculated between the trade date and the day the put is exercised. If, however, the conversion is held until expiration, the $0.46 is negated by the $0.486 of interest incurred from holding long stock over the entire 71-day period, hence the trader’s desire to see the stock decline before expiration, and thus the negative bias toward delta.
This is, incidentally, why the synthetic price (0.46 over the stock price) does not exactly equal the calculated value of the interest (0.486). The trader can exercise the put early if the stock declines and capitalize on the disparity between the interest calculated when the conversion was traded and the actual interest calculation given the shorter time frame. The model values the synthetic at a little less than the interest value would indicate—in this case $0.46 instead of $0.486.
The gamma of this trade is fairly negligible. The theta is slightly positive. Rho is the figure that deserves the most attention. Rho is the change in a


he shorter time frame. The model values the synthetic at a little less than the interest value would indicate—in this case $0.46 instead of $0.486.
The gamma of this trade is fairly negligible. The theta is slightly positive. Rho is the figure that deserves the most attention. Rho is the change in an option’s price given a change in the interest rate.
The −0.090 rho of the conversion indicates that if the interest rate rises one percentage point, the position as a whole loses $0.09. Why? The financing of the position gets more expensive as the interest rate rises. The trader would have to pay more in interest to carry the long stock. In this example, if interest rises by one percentage point, the synthetic stock, which had an effective short price of $0.46 over the price of the long stock before the interest rate increase, will be $0.55 over the price of the long stock afterward. If, however, the interest rate declines by one percentage point, the trader profits $0.09, as the synthetic is repriced by the market to $0.37 over the stock price. The lower the interest rate, the less expensive it is to finance the long stock. This is proven mathematically by put-call parity. Negative rho indicates a bearish position on the interest rate; the trader wants it to go lower. Positive rho is a bullish interest rate position.
But a one-percentage-point change in the interest rate in one day is a big and uncommon change. The question is: is rho relevant? That depends on the type of position and the type of trader. A 0.090 rho would lead to a 0.0225 profit-and-loss (P&(L)) change per one lot conversion on a 25-basis-point, or quarter percent, change. That’s just $2.25 per spread. This incremental profit or loss, however, can be relevant to professional traders like market makers. They trade very large positions with the aspiration of making small incremental profits on each trade. A market maker with a 5,000-lot conversion would stand to make or lose $11,250, given a quarter-percentage-point change in interest rate and a 0.090 rho.
The Mind of a Market Maker
Market makers are among the only traders who can trade conversions and reversals profitably, because of the size of their trades and the fact that they can buy the bid and sell the offer. Market makers often attempt to leg into and out of conversions (and reversals). Given the conversion in this example, a market maker may set out to sell calls and in turn buy stock to hedge the call’s delta risk (this will be covered in Chapters 12 and 17), then buy puts and the rest of the stock to create a balanced conversion: one call to one put to one hundred shares. The trader may try to put on the conversion in the previous example for a total of $0.50 over the price of the long stock instead of the $0.46 it’s worth. He would then try to leg out of the trade for less, say $0.45 over the stock, with the goal of locking in a $0.05 profit per spread on the whole trade.
Reversal
A reversal, or reverse conversion, is simply the opposite of the conversion: buy call, sell put, and sell (short) stock. A reversal can be executed to close a conversion, or it can be an opening transaction. Using the same stock and options as in the previous example, a trader could establish a reversal as follows:
Buy one 71-day 50 call at 3.50
Sell one 71-day 50 put at 1.50
Sell 100 shares at 51.54
The trader establishes a short position in the stock at $51.54 and a long synthetic stock position effectively at $52.00. He buys the stock synthetically at $0.46 over the stock price, again assuming the trade can be executed at fair value. With the reversal, the trader has a bullish position on interest rates, which is indicated by a positive rho.
In this example, the rho for this position is 0.090. If interest rates rise one percentage point, the synthetic stock (which the trader is long) gains nine cents in value relative to the stock. The short stock rebate on the short stock leg earns more interest at a higher interest rate. If rates fall one percentage point, the synthetic long stock loses $0.09. The trader earns less interest being short stock given a lower interest rate.
With the reversal, the fact that the put can be exercised early is a risk. Since the trader is short the put and short stock, he hopes not to get assigned. If he does, he misses out on the interest he planned on collecting when he put on the reversal for $0.46 over.
Pin Risk
Conversions and reversals are relatively low-risk trades. Rho and early exercise are relevant to market makers and other arbitrageurs, but they are among the lowest-risk positions they are likely to trade. There is one indirect risk of conversions and reversals that can be of great concern to market makers around expiration: pin risk. Pin risk is the risk of not knowing for certain whether an option will be assigned. To understand this concept, let’s revisit the mind of a market maker.
Recall that market makers have two primary functions:
1. Buy the bid or sell the

eBooks\Trading Options Greeks\Trading Options Greeks_ How Time, Volatility, and Other Pricing Factors Drive Profits (Bloomberg Financial).epub#section:text00015.html


be of great concern to market makers around expiration: pin risk. Pin risk is the risk of not knowing for certain whether an option will be assigned. To understand this concept, let’s revisit the mind of a market maker.
Recall that market makers have two primary functions:
1. Buy the bid or sell the offer.
2. Manage risk.
When institutional or retail traders send option orders to an exchange (through a broker), market makers are usually the ones with whom they trade. Customers sell the bid; the market makers buy the bid. Customers buy the offer; the market makers sell the offer. The first and arguably easier function of market makers is accomplished whenever a marketable order is sent to the exchange.
Managing risk can get a bit hairy. For example, once the market makers buy April 40 calls, their first instinct is to hedge by selling stock to become delta neutral. Market makers are almost always delta neutral, which mitigates the direction risk. The next step is to mitigate theta, gamma, and vega risk by selling options. The ideal options to sell are the same calls that were bought—that is, get out of the trade. The next best thing is to sell the April 40 puts and sell more stock. In this case, the market makers have established a reversal and thereby have very little risk. If they can lock in the reversal for a small profit, they have done their job.
What happens if the market makers still have the reversal in inventory at expiration? If the stock is above the strike price—40, in this case—the puts expire, the market makers exercise the calls, and the short stock is consequently eliminated. The market makers are left with no position, which is good. They’re delta neutral. If the stock is below 40, the calls expire, the puts get assigned, and the short stock is consequently eliminated. Again, no position. But what if the stock is exactly at $40? Should the calls be exercised? Will the puts get assigned? If the puts are assigned, the traders are left with no short stock and should let the calls expire without exercising so as not to have a long delta position after expiration. If the puts are not assigned, they should exercise the calls to get delta flat. It’s also possible that only some of the puts will be assigned.
Because they don’t know how many, if any, of the puts will be assigned, the market makers have pin risk. To avoid pin risk, market makers try to eliminate their position if they have conversions or reversals close to expiration.
Boxes and Jelly Rolls
There are two other uses of synthetic stock positions that form conventional strategies: boxes and rolls.
Boxes
When long synthetic stock is combined with short synthetic stock on the same underlying within the same expiration cycle but with a different strike price, the resulting position is known as a box. With a box, a trader is synthetically both long and short the stock. The two positions, for all intents and purposes, offset each other directionally. The risk of stock-price movement is almost entirely avoided. A study of the greeks shows that the delta is close to zero. Gamma, theta, vega, and rho are also negligible. Here’s an example of a 60–70 box for April options:
Short 1 April 60 call
Long 1 April 60 put
Long 1 April 70 call
Short 1 April 70 put
In this example, the trader is synthetically short the 60-strike and, at the same time, synthetically long the 70-strike.
Exhibit 6.9
shows the greeks.
EXHIBIT 6.9
Box greeks.
Aside from the risks associated with early exercise implications, this position is just about totally flat. The near-1.00 delta on the long synthetic stock struck at 60 is offset by the near-negative-1.00 delta of the short synthetic struck at 70. The tiny gammas and thetas of both combos are brought closer to zero when they are spread against each another. Vega is zero. And the bullish interest rate sensitivity of the long combo is nearly all offset by the bearish interest sensitivity of the short combo. The stock can move, time can pass, volatility and interest can change, and there will be very little effect on the trader’s P&(L). The question is: Why would someone trade a box?
Market makers accumulate positions in the process of buying bids and selling offers. But they want to eliminate risk. Ideally, they try to be
flat the strike
—meaning have an equal number of calls and puts at each strike price, whether through a conversion or a reversal. Often, they have a conversion at one strike and a reversal at another. The stock positions for these cancel each other out and the trader is left with only the four option legs—that is, a box. They can eliminate pin risk on both strikes by trading the box as a single trade to close all four legs. Another reason for trading a box has to do with capital.
Borrowing and Lending Money
The first thing to consider is how this spread is priced. Let’s look at another example of a box, the October 50–60 box.
Long 1 October 60 call
Short 1 October 60 put
Short 1 October 70 call
Long 1 Octob


four legs. Another reason for trading a box has to do with capital.
Borrowing and Lending Money
The first thing to consider is how this spread is priced. Let’s look at another example of a box, the October 50–60 box.
Long 1 October 60 call
Short 1 October 60 put
Short 1 October 70 call
Long 1 October 70 put
A trader with this position is synthetically long the stock at $60 and short the stock at $70. That sounds like $10 in the bank. The question is: How much would a trader be willing to pay for the right to $10? And for how much would someone be willing to sell it? At face value, the obvious answer is that the equilibrium point is at $10, but there is one variable that must be factored in: time.
In this example, assume that the October call has 90 days until expiration and the interest rate is 6 percent. A rational trader would not pay $10 today for the right to have $10 90 days from now. That would effectively be like loaning the $10 for 90 days and not receiving interest—A losing proposition! The trader on the other side of this box would be happy to enter into the spread for $10. He would have interest-free use of $10 for 90 days. That’s free money! Certainly, there is interest associated with the cost of carrying the $10. In this case, the interest would be $0.15.
This $0.15 is discounted from the price of the $10 box. In fact, the combined net value of the options composing the box should be about 9.85—with differences due mainly to rounding and the early exercise possibility for American options.
A trader buying this box—that is, buying the more ITM call and more ITM put—would expect to pay $0.15 below the difference between the strike prices. Fair value for this trade is $9.85. The seller of this box—the trader selling the meatier options and buying the cheaper ones—would concede up to $0.15 on the credit.
Jelly Rolls
A jelly roll, or simply a roll, is also a spread with four legs and a combination of two synthetic stock trades. In a box, the difference between the synthetics is the strike price; in a roll, it’s the contract month. Here’s an example:
Long 1 April 50 call
Short 1 April 50 put
Short 1 May 50 call
Long 1 May 50 put
The options in this spread all share the same strike price, but they involve two different months—April and May. In this example, the trader is long synthetic stock in April and short synthetic stock in May. Like the conversion, reversal, and box, this is a mostly flat position. Delta, gamma, theta, vega, and even rho have only small effects on a jelly roll, but like the others, this spread serves a purpose.
A trader with a conversion or reversal can roll the option legs of the position into a month with a later expiration. For example, a trader with an April 50 conversion in his inventory (short the 50 call, long the 50 put, long stock) can avoid pin risk as April expiration approaches by trading the roll from the above example. The long April 50 call and short April 50 put cancel out the current option portion of the conversion leaving only the stock. Selling the May 50 calls and buying the May 50 puts reestablishes the conversion a month farther out.
Another reason for trading a roll has to do with interest. The roll in this example has positive exposure to rho in April and negative exposure to rho in May. Based on a trader’s expectations of future changes in interest rates, a position can be constructed to exploit opportunities in interest.
Theoretical Value and the Interest Rate
The main focus of the positions discussed in this chapter is fluctuations in the interest rate. But which interest rate? That of 30-year bonds? That of 10- or 5-year notes? Overnight rates? The federal funds rate? In the theoretical world, the answer to this question is not really that important. Professors simply point to the riskless rate and continue with their lessons. But when putting strategies like these into practice, choosing the right rate makes a big difference. To answer the question of which interest rate, we must consider exactly what the rates represent from the standpoint of an economist. Therefore, we must understand how an economist makes arguments—by making assumptions.
Take the story of the priest, the physicist, and the economist stranded on a desert island with nothing to eat except a can of beans. The problem is, the can is sealed. In order to survive, they must figure out how to open the can. The priest decides he will pray for the can to be opened by means of a miracle. He prays for hours, but, alas, the can remains sealed tight. The physicist devises a complex system of wheels and pulleys to pop the top off the can. This crude machine unfortunately fails as well. After watching the lack of success of his fellow strandees, the economist announces that he has the solution: “Assume we have a can opener.”
In the spirit of economists’ logic, let’s imagine for a moment a theoretical economic microcosm in which a trader has two trading accounts at the same firm. The assumptio


ing the lack of success of his fellow strandees, the economist announces that he has the solution: “Assume we have a can opener.”
In the spirit of economists’ logic, let’s imagine for a moment a theoretical economic microcosm in which a trader has two trading accounts at the same firm. The assumptions here are that a trader can borrow 100 percent of a stock’s value to finance the purchase of the security and that there are no legal, moral, or other limitations on trading. In one account the trader is long 100 shares, fully leveraged. In the other, the trader is short 100 shares of the same stock, in which case the trader earns a short-stock rebate.
In the long run, what is the net result of this trade? Most likely, this trade is a losing proposition for the trader, because the interest rate at which the trader borrows capital is likely to be higher than the interest rate earned on the short-stock proceeds. In this example, interest is the main consideration.
But interest matters in the real world, too. Professional traders earn interest on proceeds from short stock and pay interest on funds borrowed. Interest rates may vary slightly from firm to firm and trader to trader. Interest rates are personal. The interest rate a trader should use when pricing options is specific to his or her situation.
A trader with no position in a particular stock who is interested in trading a conversion should consider that he will be buying the stock. This implies borrowing funds to open the long stock position. The trader should price his options according to the rate he will pay to borrow funds. Conversely, a trader trading a reversal should consider the fact that he is shorting the stock and will receive interest at the rate of the short-stock rebate. This trader should price his options at the short-stock rate.
A Call Is a Put
The idea that “a put is a call, a call is a put” is an important one, indeed. It lays the foundation for more advanced spreading strategies. The concepts in this chapter in one way or another enter into every spread strategy that will be discussed in this book from here on out.
Note
1
. Note, for simplicity, simple interest is used in the computation.


CHAPTER 7
Rho
Interest is one of the six inputs of an option-pricing model for American options. Although interest rates can remain constant for long periods, when interest rates do change, call and put values can be positively or negatively affected. Some options are more sensitive to changes in the interest rate than others. To the unaware trader, interest-rate changes can lead to unexpected profits or losses. But interest rates don’t have to be a wild-card risk. They’re one that experienced traders watch closely to avoid unnecessary risk and increase profitability. To monitor the effect of changes in the interest rate, it is important to understand the quiet greek—rho.
Rho and Interest Rates
Rho is a measurement of the sensitivity of an option’s value to a change in the interest rate. To understand how and why the interest rate is important to the value of an option, recall the formula for put-call parity stated in Chapter 6.
Call + Strike − Interest = Put + Stock
1
From this formula, it’s clear that as the interest rate rises, put prices must fall and call prices must rise to keep put-call parity balanced. With a little algebra, the equation can be restated to better illustrate this concept:
and
If interest rates fall,
and
Rho helps quantify this relationship. Calls have positive rho, and puts have negative rho. For example, a call with a rho of +0.08 will gain $0.08 with each one-percentage-point rise in interest rates and fall $0.08 with each one-percentage-point fall in interest rates. A put with a rho of −0.08 will lose $0.08 with each one-point rise and gain $0.08 in value with a one-point fall.
The effect of changes in the interest variable of put-call parity on call and put values is contingent on three factors: the strike price, the interest rate, and the number of days until expiration.
Interest = Strike×Interest Rate×(Days to Expiration/365)
2
Interest, for our purposes, is a function of the strike price. The higher the strike price, the greater the interest and, consequently the more changes in the interest rate will affect the option. The higher the interest rate is, the higher the interest variable will be. Likewise, the more time to expiration, the greater the effect of interest. Rho measures an option’s sensitivity to the end results of these three influences.
To understand how changes in interest affect option prices, consider a typical at-the-money (ATM) conversion on a non-dividend-paying stock.
Short 1 May 50 call at 1.92
Long 1 May 50 put at 1.63
Long 100 shares at $50
With 43 days until expiration at a 5 percent interest rate, the interest on the 50 strike will be about $0.29. Put-call parity ensures that this $0.29 shows up in option prices. After rearranging the equation, we get
In this example, both options are exactly ATM. There is no intrinsic value. Therefore, the difference between the extrinsic values of the call and the put must equal interest. If one option were in-the-money (ITM), the intrinsic value on the left side of the equation would be offset by the Stock − Strike on the right side. Still, it would be the difference in the time value of the call and put that equals the interest variable.
This is shown by the fact that the synthetic stock portion of the conversion is short at $50.29 (call − put + strike). This is $0.29 above the stock price. The synthetic stock equals the Stock + Interest, or
Certainly, if the interest rate were higher, the interest on the synthetic stock would be a higher number. At a 6 percent interest rate, the effective short price of the synthetic stock would be about $50.35. The call would be valued at about 1.95, and the put would be 1.60—a net of $0.35.
A one-percentage-point rise in the interest rate causes the synthetic stock position to be revalued by $0.06—a $0.03 gain in the call value and a $0.03 decline in the put. Therefore, by definition, the call has a +0.03 rho and the put has a −0.03 rho.
Rho and Time
The time component of interest has a big impact on the magnitude of an option’s rho, because the greater the number of days until expiration, the greater the interest. Long-term options will be more sensitive to changes in the interest rate and, therefore, have a higher rho.
Take a stock trading at about $120 per share. The July, October, and January ATM calls have the following rhos with the interest rate at 5.5 percent.
Option
Rho
July (38-day) 120 calls
+0.068
October (130-day) 120 calls
+0.226
January (221-day) 120 calls
+0.385
If interest rates rise 25 basis points, or a quarter of a percentage point, the July calls with only 38 days until expiration will gain very little: only $0.017 (0.068 × 0.25). The October 120 calls with 130 days until expiration gain more: $0.057 (0.226 × 0.25). The January calls that have 221 days until they expire make $0.096 theoretically (0.385 × 0.25). If all else is held constant, the more time to expiration, the higher the option’s rho, and therefore, the more interest will affect the option’s valu

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s until expiration gain more: $0.057 (0.226 × 0.25). The January calls that have 221 days until they expire make $0.096 theoretically (0.385 × 0.25). If all else is held constant, the more time to expiration, the higher the option’s rho, and therefore, the more interest will affect the option’s value.
Considering Rho When Planning Trades
Just having an opinion on a stock is only half the battle in options trading. Choosing the best way to trade a forecast can make all the difference to the success of a trade. Options give traders choices. And one of the choices a trader has is the month in which to trade. When trading LEAPS—Long-Term Equity AnticiPation Securities—delta, gamma, theta, and vega are important, as always, but rho is also a valuable part of the strategy.
LEAPS
Options buyers have time working against them. With each passing day, theta erodes the value of their assets. Buying a long-term option, or a LEAPS, helps combat erosion because long-term options can decay at a slower rate. In environments where there is interest rate uncertainty, however, LEAPS traders have to think about more than the rate of decay.
Consider two traders: Jason and Susanne. Both are bullish on XYZ Corp. (XYZ), which is trading at $59.95 per share. Jason decides to buy a May 60 call at 1.60, and Susanne buys a LEAPS 60 call at 7.60. In this example, May options have 44 days until expiration, and the LEAPS have 639 days.
Both of these trades are bullish, but the traders most likely had slightly different ideas about time, volatility, and interest rates when they decided which option to buy.
Exhibit 7.1
compares XYZ short-term at-the-money calls with XYZ LEAPS ATM calls.
EXHIBIT 7.1
XYZ short-term call vs. LEAPS call.
To begin with, it appears that Susanne was allowing quite a bit of time for her forecast to be realized—almost two years. Jason, however, was looking for short-term price appreciation. Concerns about time decay may have been a motivation for Susanne to choose a long-term option—her theta of 0.01 is half Jason’s, which is 0.02. With only 44 days until expiration, the theta of Jason’s May call will begin to rise sharply as expiration draws near.
But the trade-off of lower time decay is lower gamma. At the current stock price, Susanne has a higher delta. If the XYZ stock price rises $2, the gamma of the May call will cause Jason’s delta to creep higher than Susanne’s. At $62, the delta for the May 60s would be about 0.78, whereas the LEAPS 60 call delta is about 0.77. This disparity continues as XYZ moves higher.
Perhaps Susanne had implied volatility (IV) on her mind as well as time decay. These long-term ATM LEAPS options have vegas more than three times the corresponding May’s. If IV for both the May and the LEAPS is at a yearly low, LEAPS might be a better buy. A one- or two-point rise in volatility if IV reverts to its normal level will benefit the LEAPS call much more than the May.
Theta, delta, gamma, and vega are typical considerations with most trades. Because this option is long term, in addition to these typical considerations, Susanne needs to take a good hard look at rho. The LEAPS rho is significantly higher than that of its short-term counterpart. A one-percentage-point change in the interest rate will change Susanne’s P&(L) by $0.64—that’s about 8.5 percent of the value of her option—and she has nearly two years of exposure to interest rate fluctuations. Certainly, when the Federal Reserve Board has great concerns about growth or inflation, rates can rise or fall by more than one percentage point in one year’s time.
It is important to understand that, like the other greeks, rho is a snapshot at a particular price, volatility level, interest rate, and moment in time. If interest rates were to fall by one percentage point today, it would cause Susanne’s call to decline in value by $0.64. If that rate drop occurred over the life of the option, it would have a much smaller effect. Why? Rate changes closer to expiration have less of an effect on option values.
Assume that on the trade date, when the LEAPS has 639 days until expiration, interest rates fall by 25 basis points. The effect will be a decline in the value of the call of 0.16—one-fourth of the 0.638 rho. If the next rate cut occurs six months later, the rho of the LEAPS will be smaller, because it will have less time until expiration. In this case, after six months, the rho will be only 0.46. Another 25-basis-point drop will hurt the call by $0.115. After another six months, the option will have a 0.26 rho. Another quarter-point cut costs Susanne only $0.065. Any subsequent rate cuts in ensuing months will have almost no effect on the now short-term option value.
Pricing in Interest Rate Moves
In the same way that volatility can get priced in to an option’s value, so can the interest rate. When interest rates are expected to rise or fall, those expectations can be reflected in the prices of options. Say current interest rates are at 8 percent


m option value.
Pricing in Interest Rate Moves
In the same way that volatility can get priced in to an option’s value, so can the interest rate. When interest rates are expected to rise or fall, those expectations can be reflected in the prices of options. Say current interest rates are at 8 percent, but the Fed has announced that the economy is growing at too fast of a pace and that it may raise interest rates at the next Federal Open Market Committee meeting. Analysts expect more rate hikes to follow. The options with expiration dates falling after the date of the expected rate hikes will have higher interest rates priced in. In this situation, the higher interest rates in the longer-dated options will be evident when entering parameters into the model.
Take options on Already Been Chewed Bubblegum Corp. (ABC). A trader, Kyle, enters parameters into the model for ABC options and notices that the prices don’t line up. To get the theoretical values of the ATM calls for all the expiration months to sit in the middle of the actual market values, Kyle may have to tinker with the interest rate inputs.
Assume the following markets for the ATM 70-strike calls in ABC options:
Calls
Puts
Aug 70 calls
1.75–1.85
1.30–1.40
Sep 70 calls
2.65–2.75
1.75–1.85
Dec 70 calls
4.70–4.90
2.35–2.45
Mar 70 calls
6.50–6.70
2.65–2.75
ABC is at $70 a share, has a 20 percent IV in all months, and pays no dividend. August expiration is one month away.
Entering the known inputs for strike price, stock price, time to expiration, volatility, and dividend and using an 8 percent interest rate yields the following theoretical values for ABC options:
The theoretical values, in bold type, are those that don’t line up in the middle of the call and put markets. These values are wrong. The call theoretical values are too low, and the put theoretical values are too high. They are the product of an interest rate that is too low being applied to the model. To generate values that are indicative of market prices, Kyle must change the interest input to the pricing model to reflect the market’s expectations of future interest rate changes.
Using new values for the interest rate yields the following new values:
After recalculating, the theoretical values line up in the middle of the call and put markets. Using higher interest rates for the longer expirations raises the call values and lowers the put values for these months. These interest rates were inferred from, or backed out of, the option-market prices by use of the option-pricing model. In practice, it may take some trial and error to find the correct interest values to use.
In times of interest rate uncertainty, rho can be an important factor in determining which strategy to select. When rates are generally expected to continue to rise or fall over time, they are normally priced in to the options, as shown in the previous example. When there is no consensus among analysts and traders, the rates that are priced in may change as economic data are made available. This can cause a revision of option values. In long-term options that have higher rhos, this is a bona fide risk. Short-term options are a safer play in this environment. But as all traders know, risk also implies opportunity.
Trading Rho
While it’s possible to trade rho, most traders forgo this niche for more dynamic strategies with greater profitability. The effects of rho are often overshadowed by the more profound effects of the other greeks. The opportunity to profit from rho is outweighed by other risks. For most traders, rho is hardly ever even looked at.
Because LEAPS have higher rho values than corresponding short-term options, it makes sense that these instruments would be appropriate for interest-rate plays. But even with LEAPS, rho exposure usually pales in comparison with that of delta, theta, and vega.
It is not uncommon for the rho of a long-term option to be 5 to 8 percent of the option’s value. For example,
Exhibit 7.2
shows a two-year LEAPS on a $70 stock with the following pricing-model inputs and outputs:
EXHIBIT 7.2
Long 70-strike LEAPS call.
The rho is +0.793, or about 5.8 percent of the call value. That means a 25-basis-point rise in rates contributes to only a 20-cent profit on the call. That’s only about 1.5 percent of the call’s value. On one hand, 1.5 percent is not a very big profit on a trade. On the other hand, if there are more rate rises at following Fed meetings, the trader can expect further gains on rho.
Even if the trader is compelled to wait until the next Fed meeting to make another $0.20—or less, as rho will get smaller as time passes—from a second 25-basis-point rate increase, other influences will diminish rho’s significance. If over the six-week period between Fed meetings, the underlying declines by just $0.60, the $0.40 that the trader hoped to make on rho is wiped out by delta loss. With the share price $0.60 lower, the 0.760 delta costs the trade about $0.46. Furthermore, the passing of six week


rho’s significance. If over the six-week period between Fed meetings, the underlying declines by just $0.60, the $0.40 that the trader hoped to make on rho is wiped out by delta loss. With the share price $0.60 lower, the 0.760 delta costs the trade about $0.46. Furthermore, the passing of six weeks (42 days) will lead to a loss of about $0.55 from time decay because of the −0.013 theta. There is also the risk from the fat vegas associated with LEAPS. A 1.5 percent drop in implied volatility completely negates any hopes of rho profits.
Aside from the possibility that delta, theta, and vega may get in the way of profits, the bid-ask spread with these long-term options tends to be wider than with their short-term counterparts. If the bid-ask spread is more than $0.40 wide, which is often the case with LEAPS, rho profits are canceled out by this cost of doing business. Buying the offer and selling the bid negative scalps away potential profits.
With LEAPS, rho is always a concern. It will contribute to prosperity or peril and needs to be part of the trade plan from forecast to implementation. Buying or selling a LEAPS call or put, however, is not a practical way to speculate on interest rates.
To take a position on interest rates in the options market, risk needs to be distilled down to rho. The other greeks need to be spread off. This is accomplished only through the conversions, reversals, and jelly rolls described in Chapter 6. However, the bid-ask can still be a hurdle to trading these strategies for non–market makers. Generally, rho is a greek that for most traders is important to understand but not practical to trade.
Notes
1
. Please note, for simplification, dividends are not included.
2
. Note, for simplicity, simple interest is used in the calculation.


CHAPTER 8
Dividends and Option Pricing
Much of this book studies how to break down and trade certain components of option prices. This chapter examines the role of dividends in the pricing structure. There is no greek symbol that measures an option’s sensitivity to changes in the dividend. And in most cases, dividends are not “traded” by means of options in the same way that volatility, interest, and other option price influences are. Dividends do, though, affect option prices, and therefore a trader’s P&(L), so they deserve attention.
There are some instances where dividends provide ample opportunity to the option trader, and there some instances where a change in dividend policy can have desirable, or undesirable, effects on the bottom line. Despite the fact that dividends do not technically involve greeks, they need to be monitored in much the same way as do delta, gamma, theta, vega, and rho.
Dividend Basics
Let’s start at the beginning. When a company decides to pay a dividend, there are four important dates the trader must be aware of:
1. Declaration date
2. Ex-dividend date
3. Record date
4. Payable date
The first date chronologically is the declaration date. This date is when the company formally declares the dividend. It’s when the company lets its shareholders know when and in what amount it will pay the dividend. Active traders, however, may buy and sell the same stock over and over again. How does the corporation know exactly who collects the dividend when it is opening up its coffers?
Dividends are paid to shareholders of record who are on the company’s books as owning the stock at the opening of business on another important date: the record date. Anyone long the stock at this moment is entitled to the dividend. Anyone with a short stock position on the opening bell on the record date is required to make payment in the amount of the dividend. Because the process of stock settlement takes time, the important date is actually not the record date. For all intents and purposes, the key date is two days before the record date. This is called the ex-dividend date, or the ex-date.
Traders who have earned a dividend by holding a stock in their account on the morning of the ex-date have one more important date they need to know—the date they get paid. The date that the dividend is actually paid is called the payable date. The payable date can be a few weeks after the ex-date.
Let’s walk through an example. ABC Corporation announces on March 21 (the declaration date) that it will pay a 25-cent dividend to shareholders of record on April 3 (the record date), payable on April 23 (the payable date). This means market participants wishing to receive the dividend must own the stock on the open on April 1 (the ex-date). In practice, they must buy the stock before the closing bell rings on March 31 in order to have it for the open the next day.
This presents a potential quandary. If a trader only needs to have the stock on the open on the ex-date, why not buy the stock just before the close on the day before the ex-date, in this case March 31, and sell it the next morning after the open? Could this be an opportunity for riskless profit?
Unfortunately, no. There are a couple of problems with that strategy. First, as far as the riskless part is concerned, stock prices can and often do change overnight. Yesterday’s close and today’s open can sometimes be significantly different. When they are, it is referred to as a gap open. Whenever a stock is held (long or short), there is risk. The second problem with this strategy to earn riskless profit is with the profit part. On the ex-date, the opening stock price reflects the dividend. Say ABC is trading at $50 at the close on March 31. If the market for the stock opens unchanged the next morning—that is, a zero net change on the day on—ABC will be trading at $49.75 ($50 minus the $0.25 dividend). Alas, the quest for riskless profit continues.
Dividends and Option Pricing
The preceding discussion demonstrated how dividends affect stock traders. There’s one problem: we’re option traders! Option holders or writers do not receive or pay dividends, but that doesn’t mean dividends aren’t relevant to the pricing of these securities. Observe the behavior of a conversion or a reversal before and after an ex-dividend date. Assuming the stock opens unchanged on the ex-date, the relationship of the price of the synthetic stock to the actual stock price will change. Let’s look at an example to explore why.
At the close on the day before the ex-date of a stock paying a $0.25 dividend, a trader has an at-the-money (ATM) conversion. The stock is trading right at $50 per share. The 50 puts are worth 2.34, and the 50 calls are worth 2.48. Before the ex-date, the trader is
Long 100 shares at $50
Long one 50 put at 2.34
Short one 50 call at 2.48
Here, the trader is long the stock at $50 and short stock synthetically at $50.14—50 + (2.48 − 2.34). The trader is synthetically short $0.14 ove

eBooks\Trading Options Greeks\Trading Options Greeks_ How Time, Volatility, and Other Pricing Factors Drive Profits (Bloomberg Financial).epub#section:text00017.html


re worth 2.34, and the 50 calls are worth 2.48. Before the ex-date, the trader is
Long 100 shares at $50
Long one 50 put at 2.34
Short one 50 call at 2.48
Here, the trader is long the stock at $50 and short stock synthetically at $50.14—50 + (2.48 − 2.34). The trader is synthetically short $0.14 over the price at which he is long the stock.
Assume that the next morning the stock opens unchanged. Since this is the ex-date, that means the stock opens at $49.75—$0.25 lower than the previous day’s close. The theoretical values of the options will change very little. The options will be something like 2.32 for the put and 2.46 for the call.
After the ex-date, the trader is
Long 100 shares at $49.75
Long one 50 put at 2.32
Short one 50 call at 2.46
Each option is two cents lower. Why? The change in the option prices is due to theta. In this case, it’s $0.02 for each option. The synthetic stock is still short from an effective price of $50.14. With the stock at $49.75, the synthetic short price is now $0.39 over the stock. Incidentally, $0.39 is $0.25 more than the $0.14 difference before the ex-date.
Did the trader who held the conversion overnight from before the ex-date to after it make or lose money? Neither. Before the ex-date, he had an asset worth $50 per share (the stock) and he shorted the asset synthetically at $50.14. After the ex-date, he still has assets totaling $50 per share—the stock at $49.75 plus the 0.25 dividend—and he is still synthetically short the stock at $50.14. Before the ex-date, the $0.14 difference between the synthetic and the stock is interest minus the dividend. After the ex-date, the $0.39 difference is all interest.
Dividends and Early Exercise
As the ex-date approaches, in-the-money (ITM) calls on equity options can often be found trading at parity, regardless of the dividend amount and regardless of how far off expiration is. This seems counterintuitive. What about interest? What about dividends? Normally, these come into play in option valuation.
But option models designed for American options take the possibility of early exercise into account. It is possible to exercise American-style calls and exchange them for the underlying stock. This would give traders, now stockholders, the right to the dividend—a right for which they would not be eligible as call holders. Because of the impending dividend, the call becomes an exercise just before the ex-date. For this reason, the call can trade for parity before the ex-date.
Let’s look at an example of a reversal on a $70 stock that pays a $0.40 dividend. The options in this reversal have 24 days until expiration, which makes the interest on the 60 strike roughly $0.20, given a 5 percent interest rate. The day before the ex-date, a trader has the following position at the stated prices:
Short 100 shares at $70
Long one 60 call at 10.00
Short one 60 put at 0.05
To understand how American calls work just before the ex-date, it is helpful first to consider what happens if the trader holds the position until the ex-date. Making the assumption that the stock is unchanged on the ex-dividend date, it will open at $69.60, lower by the amount of the dividend—in this case, $0.40. The put, being so far out-of-the-money (OTM) as to have a negligible delta, will remain unchanged. But what about the call? With no dividend left in the stock, the put call-parity states
In this case,
Before the ex-date, the model valued the call at parity. Now it values the same call at $0.25 over parity (9.85 − [69.60 − 60]). Another way to look at this is that the time value of the call is now made up of the interest plus the put premium. Either way, that’s a gain of $0.25 on the call. That sounds good, but because the trader is short stock, if he hasn’t exercised, he will owe the $0.40 dividend—a net loss of $0.15. The new position will be
Short 100 shares at $69.60
Owe $0.40 dividend
Long one 60 call at 9.85
Short one 60 put at 0.05
At the end of the trading day before the ex-date, this trader must exercise the call to capture the dividend. By doing so, he closes two legs of the trade—the call and the stock. The $10 call premium is forfeited, the stock that is short at $70 is bought at $60 (from the call exercise) for a $10 profit. The transaction leads to neither a profit nor a loss. The purpose of exercising is to avoid the $0.15 loss ($0.25 gain in call time value minus the $0.40 loss in dividends owed).
The other way the trader could achieve the same ends is to sell the long call and buy in the short stock. This is tactically undesirable because the trader may have to sell the bid in the call and buy the offer in the stock. Furthermore, when legging a trade in this manner, there is the risk of slippage. If the call is sold first, the stock can move before the trader has a chance to buy it at the necessary price. It is generally better and less risky to exercise the call rather than leg out of the trade.
In this transaction, the trader begins with a fairly flat


manner, there is the risk of slippage. If the call is sold first, the stock can move before the trader has a chance to buy it at the necessary price. It is generally better and less risky to exercise the call rather than leg out of the trade.
In this transaction, the trader begins with a fairly flat position (short stock/long synthetic stock) and ends with a short put that is significantly out-of-the-money. For all intents and purposes, exercising the call in this trade is like synthetically selling the put. But at what price? In this case, it’s $0.15. This again is the cost benefit of saving $0.40 by avoiding the dividend obligation versus the $0.25 gain in call time value. Exercising the call is effectively like selling the put at 0.15 in this example. If the dividend is lower or the interest is higher, it may not be worth it to the trader to exercise the call to capture the dividend. How do traders know if their calls should be exercised?
The traders must do the math before each ex-dividend date in option classes they trade. The traders have to determine if the benefit from exercising—or the price at which the synthetic put is essentially being sold—is more or less than the price at which they can sell the put. The math used here is adopted from put-call parity:
This shows the case where the traders can effectively synthetically sell the put (by exercising) for more than the current put value. Tactically, it’s appropriate to use the bid price for the put in this calculation since that is the price at which the put can be sold.
In this case, the traders would be inclined to not exercise. It would be theoretically more beneficial to sell the put if the trader is so inclined.
Here, the traders, from a valuation perspective, are indifferent as to whether or not to exercise. The question then is simply: do they want to sell the put at this price?
Professionals and big retail traders who are long (ITM) calls—whether as part of a reversal, part of another type of spread, or because they are long the calls outright—must do this math the day before each ex-dividend date to maximize profits and minimize losses. Not exercising, or forgetting to exercise, can be a costly mistake. Traders who are short ITM dividend-paying calls, however, can reap the benefits of those sleeping on the job. It works both ways.
Traders who are long stock and short calls at parity before the ex-date may stand to benefit if some of the calls do not get assigned. Any shares of long stock remaining on the ex-date will result in the traders receiving dividends. If the dividends that will be received are greater in value than the interest that will subsequently be paid on the long stock, the traders may stand reap an arbitrage profit because of long call holders’ forgetting to exercise.
Dividend Plays
The day before an ex-dividend date in a stock, option volume can be unusually high. Tens of thousands of contracts sometimes trade in names that usually have average daily volumes of only a couple thousand. This spike in volume often has nothing to do with the market’s opinion on direction after the dividend. The heavy trading has to do with the revaluation of the relationship of exercisable options to the underlying expected to occur on the ex-dividend date.
Traders that are long ITM calls and short ITM calls at another strike just before an ex-dividend date have a potential liability and a potential benefit. The potential liability is that they can forget to exercise. This is a liability over which the traders have complete control. The potential benefit is that some of the short calls may not get assigned. If traders on the other side of the short calls (the longs) forget to exercise, the traders that are short the call make out by not having to pay the dividend on short stock.
Professionals and big retail traders who have very low transaction costs will sometimes trade ITM call spreads during the afternoon before an ex-dividend date. This consists of buying one call and selling another call with a different strike price. Both calls in the dividend-play strategy are ITM and have corresponding puts with little or no value (to be sure, the put value is less than the dividend minus the interest). The traders trade the spreads, fairly indifferent as to whether they buy or sell the spreads, in hope of skating—or not getting assigned—on some of their short calls. The more they don’t get assigned the better.
This usually occurs in options that have high open interest, meaning there are a lot of outstanding contracts already. The more contracts in existence, the better the possibility of someone forgetting to exercise. The greatest volume also tends to occur in the front month.
Strange Deltas
Because American calls become an exercise possibility when the ex-date is imminent, the deltas can sometimes look odd. When the calls are trading at parity, they have a 1.00 delta. They are a substitute for the stock. They, in fact, will be stock if and when the


ur in the front month.
Strange Deltas
Because American calls become an exercise possibility when the ex-date is imminent, the deltas can sometimes look odd. When the calls are trading at parity, they have a 1.00 delta. They are a substitute for the stock. They, in fact, will be stock if and when they are exercised just before the ex-date. But if the puts still have some residual time value, they may also have a small delta, of 0.05 or perhaps more.
In this unique scenario, the delta of the synthetic can be greater than +1.00 or less than −1.00. It is not uncommon to see the absolute values of the call and put deltas add up to 1.07 or 1.08. When the dividend comes out of the options model on the ex-date, synthetics go back to normal. The delta of the synthetic again approaches 1.00. Because of the out-of-whack deltas, delta-neutral traders need to take extra caution in their analytics when ex-dates are near. A little common sense should override what the computer spits out.
Inputting Dividend Data into the Pricing Model
Often dividend payments are regular and predictable. With many companies, the dividend remains constant quarter after quarter. Some corporations have a track record of incrementally increasing their dividends every year. Some companies pay dividends in a very irregular fashion, by paying special dividends that are often announced as a surprise to investors. In a truly capitalist society, there are no restrictions and no rules on when, whether, or how corporations pay dividends to their shareholders. Unpredictability of dividends, though, can create problems in options valuation.
When a company has a constant, reasonably predictable dividend, there is not a lot of guesswork. Take Exelon Corp. (EXC). From November 2008 to the time of this writing, Exelon has paid a regular quarterly dividend of $0.525. During that period, a trader has needed simply to enter 0.525 into the pricing calculator for all expected future dividends to generate the theoretical value. Based on recent past performance, the trader could feel confident that the computed analytics were reasonably accurate. If the trader believed the company would continue its current dividend policy, there would be little options-related dividend risk—unless things changed.
When there is uncertainty about when future dividends will be paid in what amounts, the level of dividend-related risk begins to increase. The more uncertainty, the more risk. Let’s examine an interesting case study: General Electric (GE).
For a long time, GE was a company that has had a history of increasing its dividends at fairly regular intervals. In fact, there was more than a 30-year stretch in which GE increased its dividend every year. During most of the first decade of the 2000s, increases in GE’s dividend payments were around one to six cents and tended to occur toward the end of December, after December expiration. The dividends were paid four times per year but not exactly quarterly. For several years, the ex-dates were in February, June, September, and December. Option traders trading GE options had a pretty easy time estimating their future dividend streams, and consequently evaded valuation problems that could result from using wrong dividend data. Traders would simply adjust the dividend data in the model to match their expectations for predictably increasing future dividends in order to achieve an accurate theoretical value. Let’s look back at GE to see how a trader might have done this.
The following shows dividend-history data for GE.
Ex-Date
Dividend
*
12/27/02
$0.19
02/26/03
$0.19
06/26/03
$0.19
09/25/03
$0.19
12/29/03
$0.20
02/26/04
$0.20
06/24/04
$0.20
09/23/04
$0.20
12/22/04
$0.22
02/24/05
$0.22
06/23/05
$0.22
09/22/05
$0.22
12/22/05
$0.25
02/23/06
$0.25
06/22/06
$0.25
09/21/06
$0.25
12/21/06
$0.28
02/22/07
$0.28
06/21/07
$0.28
*
These data are taken from the following Web page on GE’s web site:
www.ge.com/investors/stock_info/dividend_history.html
.
At the end of 2006, GE raised its dividend from $0.25 to $0.28. A trader trading GE options at the beginning of 2007 would have logically anticipated the next increase to occur again in the following December unless there was reason to believe otherwise. Options expiring before this anticipated next dividend increase would have the $0.28 dividend priced into their values. Options expiring after December 2007 would have a higher dividend priced into them—possibly an additional three cents to 0.31 (which indeed it was). Calls would be adversely affected by this increase, and puts would be favorably affected. A typical trader would have anticipated those changes. The dividend data a trader pricing GE options would have entered into the model in January 2007 would have looked something like this.
Ex-Date
Dividend
*
02/22/07
$0.28
06/21/07
$0.28
09/20/07
$0.28
12/20/07
$0.31
02/21/08
$0.31
06/19/08
$0.31
09/18/08
$0.31
*
These data are taken from the following Web page on GE’s web site:
www.ge.com/investors


uld have entered into the model in January 2007 would have looked something like this.
Ex-Date
Dividend
*
02/22/07
$0.28
06/21/07
$0.28
09/20/07
$0.28
12/20/07
$0.31
02/21/08
$0.31
06/19/08
$0.31
09/18/08
$0.31
*
These data are taken from the following Web page on GE’s web site:
www.ge.com/investors/stock_info/dividend_history.html
.
The trader would have entered the anticipated future dividend amount in conjunction with the anticipated ex-dividend date. This trader projection goes out to February 2008, which would aid in valuing options expiring in 2007 as well as the 2008 LEAPS. Because the declaration dates had yet to occur, one could not know with certainty when the dividends would be announced or in what amount. Certainly, there would be some estimation involved for both the dates and the amount. But traders would probably get it pretty close—close enough.
Then, something particularly interesting happened. Instead of raising the dividend going into December 2008 as would be a normal pattern, GE kept it the same. As shown, the 12/24/08 ex-dated dividend remained $0.31.
Ex-Date
Dividend
*
02/22/07
$0.28
06/21/07
$0.28
09/20/07
$0.28
12/20/07
$0.31
02/21/08
$0.31
06/19/08
$0.31
09/18/08
$0.31
12/24/08
$0.31
*
These data are taken from the following Web page on GE’s web site:
www.ge.com/investors/stock_info/dividend_history.html
.
The dividend stayed at $0.31 until the June 2009 dividend, which held another jolt for traders pricing options. Around this time, GE’s stock price had taken a beating. It fell from around $42 a share in the fall of 2007 ultimately to about $6 in March 2009. GE had its first dividend cut in more than three decades. The dividend with the ex-date of 06/18/09 was $0.10.
12/24/08
$0.31
02/19/09
$0.31
06/18/09
$0.10
09/17/09
$0.10
12/23/09
$0.10
02/25/10
$0.10
06/17/10
$0.10
09/16/10
$0.12
12/22/10
$0.14
02/24/11
$0.14
06/16/11
$0.15
09/15/11
$0.15
Though the company gave warnings in advance, the drastic dividend change had a significant impact on option prices. Call prices were helped by the dividend cut (or anticipated dividend cut) and put prices were hurt.
The break in the pattern didn’t stop there. The dividend policy remained $0.10 for five quarters until it rose to $0.12 in September 2010, then to $0.14 in December 2010, then to $0.15 in June 2011. These irregular changes in the historically predictable dividend policy made it tougher for traders to attain accurate valuations. If the incremental changes were bigger, the problem would have been even greater.
Good and Bad Dates with Models
Using an incorrect date for the ex-date in option pricing can lead to unfavorable results. If the ex-dividend date is not known because it has yet to be declared, it must be estimated and adjusted as need be after it is formally announced. Traders note past dividend history and estimate the expected dividend stream accordingly. Once the dividend is declared, the ex-date is known and can be entered properly into the pricing model. Not executing due diligence to find correct known ex-dates can lead to trouble. Using a bad date in the model can yield dubious theoretical values that can be misleading or worse—especially around the expiration.
Say a call is trading at 2.30 the day before the ex-date of a $0.25 dividend, which happens to be thirty days before expiration. The next day, of course, the stock may have moved higher or lower. Assume for illustrative purposes, to compare apples to apples as it were, that the stock is trading at the same price—in this case, $76.
If the trader is using the correct date in the model, the option value will adjust to take into account the effect of the dividend expiring, or reaching its ex-date, when the number of days to expiration left changes from 30 to 29. The call trading postdividend will be worth more relative to the same stock price. If the dividend date the trader is using in the model is wrong, say one day later than it should be, the dividend will still be an input of the theoretical value. The calculated value will be too low. It will be wrong.
Exhibit 8.1
compares the values of a 30-day call on the ex-date given the right and the wrong dividend.
EXHIBIT 8.1
Comparison of 30-day call values
At the same stock price of $76 per share, the call is worth $0.13 more after the dividend is taken out of the valuation. Barring any changes in implied volatility (IV) or the interest rate, the market prices of the options should reflect this change. A trader using an ex-date in the model that is farther in the future than the actual ex-date will still have the dividend as part of the generated theoretical value. With the ex-date just one day later, the call would be worth 2.27. The difference in option value is due to the effect of theta—in this case, $0.03.
With a bad date, the value of 2.27 would likely be significantly below market price, causing the market value of the option to look more expensive than it actually is. If the trader did not know the date was w


th 2.27. The difference in option value is due to the effect of theta—in this case, $0.03.
With a bad date, the value of 2.27 would likely be significantly below market price, causing the market value of the option to look more expensive than it actually is. If the trader did not know the date was wrong, he would need to raise IV to make the theoretical value match the market. This option has a vega of 0.08, which translates into a difference of about two IV points for the theoretical values 2.43 and 2.27. The trader would perceive the call to be trading at an IV two points higher than the market indicates.
Dividend Size
It’s not just the date but also the size of the dividend that matters. When companies change the amount of the dividend, options prices follow in step. In 2004, when Microsoft (MSFT) paid a special dividend of $3 per share, there were unexpected winners and losers in the Microsoft options. Traders who were long calls or short puts were adversely affected by this change in dividend policy. Traders with short calls or long puts benefited. With long-term options, even less anomalous changes in the size of the dividend can have dramatic effects on options values.
Let’s study an example of how an unexpected rise in the quarterly dividend of a stock affects a long call position. Extremely Yellow Zebra Corp. (XYZ) has been paying a quarterly dividend of $0.10. After a steady rise in stock price to $61 per share, XYZ declares a dividend payment of $0.50. It is expected that the company will continue to pay $0.50 per quarter. A trader, James, owns the 528-day 60-strike calls, which were trading at 9.80 before the dividend increase was announced.
Exhibit 8.2
compares the values of the long-term call using a $0.10 quarterly dividend and using a $0.50 quarterly dividend.
EXHIBIT 8.2
Effect of change in quarterly dividend on call value.
This $0.40 dividend increase will have a big effect on James’s calls. With 528 days until expiration, there will be six dividends involved. Because James is long the calls, he loses 1.52 per option. If, however, he were short the calls, 1.52 would be his profit on each option.
Put traders are affected as well. Another trader, Marty, is long the 60-strike XYZ puts. Before the dividend announcement, Marty was running his values with a $0.10 dividend, giving his puts a value of 5.42.
Exhibit 8.3
compares the values of the puts with a $0.10 quarterly dividend and with a $0.50 quarterly dividend.
EXHIBIT 8.3
Effect of change in quarterly dividend on put value.
When the dividend increase is announced, Marty will benefit. His puts will rise because of the higher dividend by $0.66 (all other parameters held constant). His long-term puts with six quarters of future expected dividends will benefit more than short-term XYZ puts of the same strike would. Of course, if he were short the puts, he would lose this amount.
The dividend inputs to a pricing model are best guesses until the dates and amounts are announced by the company. How does one find dividend information? Regularly monitoring the news and press releases on the companies one trades is a good way to stay up to date on dividend information, as well as other company news. Dividend announcements are widely disseminated by the major news services. Most companies also have an investor-relations phone number and section on their web sites where dividend information can be found.


CHAPTER 9
Vertical Spreads
Risk—it is the focal point around which all trading revolves. It may seem as if profit should be occupying this seat, as most important to trading options, but without risk, there would be no profit! As traders, we must always look for ways to mitigate, eliminate, preempt, and simply avoid as much risk as possible in our pursuit of success without diluting opportunity. Risk must be controlled. Trading vertical spreads takes us one step further in this quest.
The basic strategies discussed in Chapters 4 and 5 have strengths when compared with pure linear trading in the equity markets. But they have weaknesses, too. Consider the covered call, one of the most popular option strategies.
A covered call is best used as an augmentation to an investment plan. It can be used to generate income on an investment holding, as an entrance strategy into a stock, or as an exit strategy out of a stock. But from a trading perspective, one can often find better ways to trade such a forecast.
If the forecast on a stock is neutral to moderately bullish, accepting the risk of stock ownership is often unwise. There is always the chance that the stock could collapse. In many cases, this is an unreasonable risk to assume.
To some extent, we can make the same case for the long call, short put, naked call, and the like. In certain scenarios, each of these basic strategies is accompanied with unwanted risks that serve no beneficial purpose to the trader but can potentially cause harm. In many situations, a vertical spread is a better alternative to these basic spreads. Vertical spreads allow a trader to limit potential directional risk, limit theta and vega risk, free up margin, and generally manage capital more efficiently.
Vertical Spreads
Vertical spreads involve buying one option and selling another. Both are on the same underlying and expire the same month, and both are either calls or puts. The difference is in the strike prices of the two options. One is higher than the other, hence the name
vertical spread
. There are four vertical spreads: bull call spread, bear call spread, bear put spread, and bull put spread. These four spreads can be sliced and diced into categories a number of ways: call spreads and put spreads, bull spreads and bear spreads, debit spreads and credit spreads. There is overlap among the four verticals in how and when they are used. The end of this chapter will discuss how the spreads are interrelated.
Bull Call Spread
A bull call spread is a long call combined with a short call that has a higher strike price. Both calls are on the same underlying and share the same expiration month. Because the purchased call has a lower strike price, it costs more than the call being sold. Establishing the trade results in a debit to the trader’s account. Because of this debit, it’s called a debit spread.
Below is an example of a bull call spread on Apple Inc. (AAPL):
In this example, Apple is trading around $391. With 40 days until February expiration, the trader buys the 395–405 call spread for a net debit of $4.40, or $440 in actual cash. Or one could simply say the trader paid $4.40 for the 395–405 call.
Consider the possible outcomes if the spread is held until expiration.
Exhibit 9.1
shows an at-expiration diagram of the bull call spread.
EXHIBIT 9.1
AAPL bull call spread.
Before discussing the greeks, consider the bull call spread from an at-expiration perspective. Unlike the long call, which has two possible outcomes at expiration—above or below the strike—this spread has three possibilities: below both strikes, between the strikes, or above both strikes.
In this example, if Apple is below $395 at expiration, both calls expire worthless. The rights and obligations of the options are gone, as is the cash spent on the trade. In this case, the entire debit of $4.40 is lost.
If Apple is between the strikes at expiration, the 405-strike call expires worthless. The trader is long stock at an effective price of $399.40. This is the $395-strike price at which the stock would be purchased if the call is exercised, plus the $4.40 premium spent on the spread. The break-even price of the trade is $399.40. If Apple is above $399.40 at expiration, the trade is profitable; below $399.40, it is a loser. The aptly named bull call spread requires the stock to rise to reach its profit potential. But unlike an outright long call, profits are capped with the spread.
If Apple is above $405 at expiration, both calls are in-the-money (ITM). If the 395-strike calls are exercised, the trader buys 100 shares of Apple at $395 and these shares, in turn, would be sold at $405 when the 405-strike calls are assigned, for a $10 gain per share. Subtract from that $10 the $4.40 debit spent on the trade and the net profit is $5.60 per share.
There are some other differences between the 395–405 call spread and the outright purchase of the 395 call. The absolute risk is lower. To buy the 395-strike call costs 14.60, versus

eBooks\Trading Options Greeks\Trading Options Greeks_ How Time, Volatility, and Other Pricing Factors Drive Profits (Bloomberg Financial).epub#section:text00019.html


$10 gain per share. Subtract from that $10 the $4.40 debit spent on the trade and the net profit is $5.60 per share.
There are some other differences between the 395–405 call spread and the outright purchase of the 395 call. The absolute risk is lower. To buy the 395-strike call costs 14.60, versus 4.40 for the spread—a big difference. Because the debit is lower, the margin for the spread is lower at most option-friendly brokers, as well.
If we dig a little deeper, we find some other differences between the bull call spread and the outright call. Long options are haunted by the specter of time. Because the spread involves both a long and a short option, the time-decay risk is lower than that associated with owning an option outright. Implied volatility (IV) risk is lower, too.
Exhibit 9.2
compares the greeks of the long 395 call with those of the 395–405 call spread.
EXHIBIT 9.2
Apple call versus bull call spread (Apple @ $391).
395 Call
395–405 Call
Delta
0.484
0.100
Gamma
0.0097
0.0001
Theta
−0.208
−0.014
Vega
0.513
0.020
The positive deltas indicate that both positions are bullish, but the outright call has a higher delta. Some of the 395 call’s directional sensitivity is lost when the 405 call is sold to make a spread. The negative delta of the 405 call somewhat offsets the positive delta of the 395 call. The spread delta is only about 20 percent of the outright call’s delta. But for a trader wanting to focus on trading direction, the smaller delta can be a small sacrifice for the benefit of significantly reduced theta and vega. Theta spread’s risk is about 7 percent that of the outright. The spread’s vega risk is also less than 4 percent that of the outright 395 call. With the bull call spread, a trader can spread off much of the exposure to the unwanted risks and maintain a disproportionately higher greeks in the wanted exposure (delta).
These relationships change as the underlying moves higher. Remember, at-the-money (ATM) options have the greatest sensitivity to theta and vega. With Apple sitting at around the long strike, gamma and vega have their greatest positive value, and theta has its most negative value.
Exhibit 9.3
shows the spread greeks given other underlying prices.
EXHIBIT 9.3
AAPL 395–405 bull call spread.
As the stock moves higher toward the 405 strike, the 395 call begins to move away from being at-the-money, and the 405 call moves toward being at-the-money. The at-the-money is the dominant strike when it comes to the characteristics of the spread greeks. Note the greeks position when the underlying is directly between the two strike prices: The long call has ceased to be the dominant influence on these metrics. Both calls influence the analytics pretty evenly. The time-decay risk has been entirely spread off. The volatility risk is mostly spread off. Gamma remains a minimal concern. When the greeks of the two calls balance each other, the result is a directional play.
As AAPL continues to move closer to the 405-strike, it becomes the at-the-money option, with the dominant greeks. The gamma, theta, and vega of the 405 call outweigh those of the ITM 395 call. Vega is more negative. Positive theta now benefits the trade. The net gamma of the spread has turned negative. Because of the negative gamma, the delta has become smaller than it was when the stock was at $400. This means that the benefit of subsequent upward moves in the stock begins to wane. Recall that there is a maximum profit threshold with a vertical spread. As the stock rises beyond $405, negative gamma makes the delta smaller and time decay becomes less beneficial. But at this point, the delta has done its work for the trader who bought this spread when the stock was trading around $395. The average delta on a move in the stock from $395 to $405 is about 0.10 in this case.
When the stock is at the 405 strike, the characteristics of the trade are much different than they are when the stock is at the 395 strike. Instead of needing movement upward in the direction of the delta to combat the time decay of the long calls, the position can now sit tight at the short strike and reap the benefits of option decay. The key with this spread, and with all vertical spreads, is that the stock needs to move in the direction of the delta to the short strike.
Strengths and Limitations
There are many instances when a bull call spread is superior to other bullish strategies, such as a long call, and there are times when it isn’t. Traders must consider both price and time.
A bull call spread will always be cheaper than the outright call purchase. That’s because the cost of the long-call portion of the spread is partially offset by the premium of the higher-strike short call. Spending less for the same exposure is always a better choice, but the exposure of the vertical is not exactly the same as that of the long call. The most obvious trade-off is the fact that profit is limited. For smaller moves—up to the price of the short strike—vertical


e higher-strike short call. Spending less for the same exposure is always a better choice, but the exposure of the vertical is not exactly the same as that of the long call. The most obvious trade-off is the fact that profit is limited. For smaller moves—up to the price of the short strike—vertical spreads tend to be better trades than outright call purchases. Beyond the strike? Not so much.
But time is a trade-off, too. There have been countless times that I have talked with new traders who bought a call because they thought the stock was going up. They were right and still lost money. As the adage goes, timing is everything. The more time that passes, the more advantageous the lower-theta vertical spread becomes. When held until expiration, a vertical spread can be a better trade than an outright call in terms of percentage profit.
In the previous example, when Apple is at $391 with 40 days until expiration, the 395 call is worth 14.60 and the spread is worth 4.40. If Apple were to rise to be trading at $405 at expiration, the call rises to be worth 10, for a loss of 4.60 on the 14.60 debit paid. The spread also is worth 10. It yields a gain of about 127 percent on the initial $4.40 per share debit.
But look at this same trade if the move occurs before expiration. If Apple rallies to $405 after only a couple weeks, the outcome is much different. With four weeks still left until expiration, the 395 call is worth 19.85 with the underlying at $405. That’s a 36 percent gain on the 14.60. The spread is worth 5.70. That’s a 30 percent gain. The vertical spread must be held until expiration to reap the full benefits, which it accomplishes through erosion of the short option.
The long-call-only play (with a significantly larger negative theta) is punished severely by time passing. The long call benefits more from a quick move in the underlying. And of course, if the stock were to rise to a price greater than $405, in a short amount of time—the best of both worlds for the outright call—the outright long 395 call would be emphatically superior to the spread.
Bear Call Spread
The next type of vertical spread is called a
bear call spread
. A bear call spread is a short call combined with a long call that has a higher strike price. Both calls are on the same underlying and share the same expiration month. In this case, the call being sold is the option of higher value. This call spread results in a net credit when the trade is put on and, therefore, is called a credit spread.
The bull call spread and the bear call spread are two sides of the same coin. The difference is that with the bull call spread, one is buying the call spread, and with the bear call spread, one is selling the call spread. An example of a bear call spread can be shown using the same trade used earlier.
Here we are selling one AAPL February (40-day) 395 call at 14.60 and buying the 405 call at 10.20. We are selling the 395–405 call at $4.40 per share, or $440.
Exhibit 9.4
is an at-expiration diagram of the trade.
EXHIBIT 9.4
Apple bear call spread.
The same three at-expiration outcomes are possible here as with the bull call spread: the stock can be above both strikes, between both strikes, or below both strikes. If the stock is below both strikes at expiration, both calls will expire worthless. The rights and obligations cease to exist. In this case, the entire credit of $440 is profit.
If AAPL is between the two strike prices at expiration, the 395-strike call will be in-the-money. The short call will get assigned and result in a short stock position at expiration. The break-even price falls at $399.40—the short strike plus the $4.40 net premium. This is the price at which the stock will effectively be sold if assignment occurs.
If Apple is above both strikes at expiration, it means both calls are in-the-money. Stock is sold at $395 because of assignment and bought back at $405 through exercise. This leads to a loss of $10 per share on the negative scalp. Factoring in the $4.40-per-share credit makes the net loss only $5.60 per share with AAPL above $405 at February expiration.
Just as the at-expiration diagram is the same but reversed, the greeks for this call spread will be similar to those in the bull call spread example except for the positive and negative signs. See
Exhibit 9.5
.
EXHIBIT 9.5
Apple 395–405 bear call spread.
A credit spread is commonly traded as an income-generating strategy. The idea is simple: sell the option closer-to-the-money and buy the more out-of-the-money (OTM) option—that is, sell volatility—and profit from nonmovement (above a certain point). In this example, with Apple at $391, a neutral to slightly bearish trader would think about selling this spread at 4.40 in hopes that the stock will remain below $395 until expiration. The best-case scenario is that the stock is below $395 at expiration and both options expire, resulting in a $4.40-per-share profit.
The strategy profits as long as Apple is under its break-even


think about selling this spread at 4.40 in hopes that the stock will remain below $395 until expiration. The best-case scenario is that the stock is below $395 at expiration and both options expire, resulting in a $4.40-per-share profit.
The strategy profits as long as Apple is under its break-even price, $399.40, at expiration. But this is not so much a bearish strategy as it is a nonbullish strategy. The maximum gain with a credit spread is the premium received, in this case $4.40 per share. Traders who thought AAPL was going to decline sharply would short it or buy a put. If they thought it would rise sharply, they’d use another strategy.
From a greek perspective, when the trade is executed it’s very close to its highest theta price point—the 395 short strike price. This position theoretically collects $0.90 a day with Apple at around $395. As time passes, that theta rises. The key is that the stock remains at around $395 until the short option is just about worthless. The name of the game is sit and wait.
Although the delta is negative, traders trading this spread to generate income want the spread to expire worthless so they can pocket the $4.40 per share. If Apple declines, profits will be made on delta, and theta profits will be foregone later. All that matters is the break-even point. Essentially, the idea is to sell a naked call with a maximum potential loss. Sell the 395s and buy the 405s for protection.
If the underlying decreases enough in the short term and significant profits from delta materialize, it is logical to consider closing the spread early. But it often makes more sense to close part of the spread. Consider that the 405-strike call is farther out-of-the-money and will lose its value before the 395 call.
Say that after two weeks a big downward move occurs. Apple is trading at $325 a share; the 405s are 0.05 bid at 0.10, and the 395s are 0.50 bid at 0.55. At this point, the lion’s share of the profits can be taken early. A trader can do so by closing only the 395 calls. Closing the 395s to eliminate the risk of negative delta and gamma makes sense. But does it make sense to close the 405s for 0.05? Usually not. Recouping this residual value accomplishes little. It makes more sense to leave them in your position in case the stock rebounds. If the stock proves it can move down $70; it can certainly move up $70. Because the majority of the profits were taken on the 395 calls, holding on to the 405s is like getting paid to own calls. In scenarios where a big move occurs and most of the profits can be taken early, it’s often best to hold the long calls, just in case. It’s a win-win situation.
Credit and Debit Spread Similarities
The credit call spread and the debit call spread appear to be exactly opposite in every respect. Many novice traders perceive credit spreads to be fundamentally different from debit spreads. That is not necessarily so. Closer study reveals that these two are not so different after all.
What if Apple’s stock price was higher when the trade was put on? What if the stock was at $405? First, the spread would have had more value. The 395 and 405 calls would both be worth more. A trader could have sold the spread for a $5.65-per-share credit. The at-expiration diagram would look almost the same. See
Exhibit 9.6
.
EXHIBIT 9.6
Apple bear call spread initiated with Apple at $405.
Because the net premium is much higher in this example, the maximum gain is more—it is $5.65 per share. The breakeven is $400.65. The price points on the at-expiration diagram, however, have nothing to do with the greeks. The analytics from
Exhibit 9.5
are the same either way.
The motivation for a trader selling this call spread, which has both options in-the-money, is different from that for the typical income generator. When the spread is sold in this context, the trader is buying volatility. Long gamma, long vega, negative theta. The trader here has a trade more like the one in the bull call spread example—except that instead of needing a rally, the trader needs a rout. The only difference is that the bull call spread has a bullish delta, and the bear call spread has a bearish delta.
Bear Put Spread
There is another way to take a bearish stance with vertical spreads: the bear put spread. A bear put spread is a long put plus a short put that has a lower strike price. Both puts are on the same underlying and share the same expiration month. This spread, however, is a debit spread because the more expensive option is being purchased.
Imagine that a stock has had a good run-up in price. The chart shows a steady march higher over the past couple of months. A study of technical analysis, though, shows that the run-up may be pausing for breath. An oscillator, such as slow stochastics, in combination with the relative strength index (RSI), indicates that the stock is overbought. At the same time, the average directional movement index (ADX) confirms that the uptrend is slowing.
For traders looking for a


he run-up may be pausing for breath. An oscillator, such as slow stochastics, in combination with the relative strength index (RSI), indicates that the stock is overbought. At the same time, the average directional movement index (ADX) confirms that the uptrend is slowing.
For traders looking for a small pullback, a bear put spread can be an excellent strategy. The goal is to see the stock drift down to the short strike. So, like the other members of the vertical spread family, strike selection is important.
Let’s look at an example of ExxonMobil (XOM). After the stock has rallied over a two-month period to $80.55, a trader believes there will be a short-term temporary pullback to $75. Instead of buying the June 80 puts for 1.75, the trader can buy the 75–80 put spread of the same month for 1.30 because the 75 put can be sold for 0.45.
1
In this example, the June put has 40 days until expiration.
Exhibit 9.7
illustrates the payout at expiration.
EXHIBIT 9.7
ExxonMobil bear put spread.
If the trader is wrong and ExxonMobil is still above 80 at expiry, both puts expire and the 1.30 premium is lost. If ExxonMobil is between the two strikes, the 80 puts are ITM, resulting in an exercise, and the 75 puts are OTM and expire. The net effect is short stock at an effective price of $78.70. The effective sale price is found by taking the price at which the short stock is established when the puts are exercised—$80—minus the net 1.30 paid for the spread. This is the spread’s breakeven at expiration.
If the trader is right and ExxonMobil is below both strikes at expiration, both puts are ITM, and the result is a 3.70 profit and no position. Why a 3.70 profit? The 80 puts are exercised, making the trader short at $80, and the 75 puts are assigned, so the short is bought back at $75 for a positive stock scalp of $5. Including the 1.30 debit for the spread in the profit and loss (P&(L)), the net profit is $3.70 per share when the stock is below both strikes at expiration.
This is a bearish trade. But is the bear put spread necessarily a better trade than buying an outright ATM put? No. The at-expiration diagram makes this clear. Profits are limited to $3.70 per share. This is an important difference. But because in this particular example, the trader expects the stock to retrace only to around $75, the benefits of lower cost and lower theta and vega risk can be well worth the trade-off of limited profit. The trader’s objectives are met more efficiently by buying the spread. The goal is to profit from the delta move down from $80 to $75.
Exhibit 9.8
shows the differences between the greeks of the outright put and the spread when the trade is put on with ExxonMobil at $80.55.
EXHIBIT 9.8
ExxonMobil put vs. bear put spread (ExxonMobil @ $80.55).
80 Put
75–80 Put
Delta
−0.445
−0.300
Gamma
+0.080
+0.041
Theta
−0.018
−0.006
Vega
+0.110
+0.046
As in the call-spread examples discussed previously, the spread delta is smaller than the outright put’s. It appears ironic that the spread with the smaller delta is a better trade in this situation, considering that the intent is to profit from direction. But it is the relative differences in the greeks besides delta that make the spread worthwhile given the trader’s goal. Gamma, theta, and vega are proportionately much smaller than the delta in the spread than in the outright put. While the spread’s delta is two thirds that of the put, its gamma is half, its theta one third, and its vega around 42 percent of the put’s.
Retracements such as the one called for by the trader in this example can happen fast, sometimes over the course of a week or two. It’s not necessarily bad if this move occurs quickly. If ExxonMobil drops by $5 right away, the short delta will make the position profitable.
Exhibit 9.9
shows how the spread position changes as the stock declines from $80 to $75.
EXHIBIT 9.9
75–80 bear put spread as ExxonMobil declines.
The delta of this trade remains negative throughout the stock’s descent to $75. Assuming the $5 drop occurs in one day, a delta averaging around −0.36 means about a 1.80 profit, or $180 per spread, for the $5 move (0.36 times $5 times 100). This is still a far cry from the spread’s $3.70 potential profit. Although the stock is at $75, the maximum profit potential has yet to be reached, and it won’t be until expiration. How does the rest of the profit materialize? Time decay.
The price the trader wants the stock to reach is $75, but the assumption here is that the move happens very fast. The trade went from being a long-volatility play—long gamma and vega—to a short-vol play: short gamma and vega. The trader wanted movement when the stock was at $80 and wants no movement when the stock is at $75. When the trade changes characteristics by moving from one strike to another, the trader has to reconsider the stock’s outlook. The question is: if I didn’t have this position on, would I want it now?
The trader has a choice to make: take the $180 profit—which represent


ment when the stock is at $75. When the trade changes characteristics by moving from one strike to another, the trader has to reconsider the stock’s outlook. The question is: if I didn’t have this position on, would I want it now?
The trader has a choice to make: take the $180 profit—which represents a 138 percent profit on the 1.30 debit—or wait for theta to do its thing. The trader looking for a retracement would likely be inclined to take a profit on the trade. Nobody ever went broke taking a profit. But if the trader thinks the stock will sit tight for the remaining time until expiration, he will be happy with this income-generating position.
Although the trade in the last, overly simplistic example did not reap its full at-expiration potential, it was by no means a bad trade. Holding the spread until expiration is not likely to be part of a trader’s plan. Buying the 80 put outright may be a better play if the trader is expecting a fast move. It would have a bigger delta than the spread. Debit and credit spreads can be used as either income generators or as delta plays. When they’re used as delta plays, however, time must be factored in.
Bull Put Spread
The last of the four vertical spreads is a bull put spread. A bull put spread is a short put with one strike and a long put with a lower strike. Both puts are on the same underlying and in the same expiration cycle. A bull put spread is a credit spread because the more expensive option is being sold, resulting in a net credit when the position is established. Using the same options as in the bear put example:
With ExxonMobil at $80.55, the June 80 puts are sold for 1.75 and the June 75 puts are bought at 0.45. The trade is done for a credit of 1.30.
Exhibit 9.10
shows the payout of this spread if it is held until expiration.
EXHIBIT 9.10
ExxonMobil bull put spread.
The sale of this spread generates a 1.30 net credit, which is represented by the maximum profit to the right of the 80 strike. With ExxonMobil above $80 per share at expiration, both options expire OTM and the premium is all profit. Between the two strike prices, the 80 put expires in the money. If the ITM put is still held at expiration, it will be assigned. Upon assignment, the put becomes long stock, profiting with each tick higher up to $80, or losing with each tick lower to $75. If the 80 put is assigned, the effective price of the long stock will be $78.70. The assignment will “hit your sheets” as a buy at $80, but the 1.30 credit lowers the effective net cost to $78.70.
If the stock is below $75 at option expiration, both puts will be ITM. This is the worst case scenario, because the higher-struck put was sold. At expiration, the 80 puts would be assigned, the 75 puts exercised. That’s a negative scalp of $5 on the resulting stock. The initial credit lessens the pain by 1.30. The maximum possible loss with ExxonMobil below both strikes at expiration is $3.70 per spread.
The spread in this example is the flip side of the bear put spread of the previous example. Instead of buying the spread, as with the bear put, the spread in this case is sold.
Exhibit 9.11
shows the analytics for the bull put spread.
EXHIBIT 9.11
Greeks for ExxonMobil 75–80 bull put spread.
Instead of having a short delta, as with the bear spread, the bull spread is long delta. There is negative theta with positive gamma and vega as XOM approaches the long strike—the 75s, in this case. There is also positive theta with negative gamma and vega around the short strike—the 80s.
Exhibit 9.11
shows the characteristics that define the vertical spread. If one didn’t know which particular options were being traded here, this could almost be a table of greeks for either a 75–80 bull put spread or a 75–80 bull call spread.
Like the other three verticals, this spread can be a delta play or a theta play. A bullish trader may sell the spread if both puts are in-the-money. Imagine that XOM is trading at around $75. The spread will have a positive 0.364 delta, positive gamma, and negative theta. The spread as a whole is a decaying asset. It needs the underlying to rally to combat time decay.
A bullish trader may also sell this spread if XOM is between the two strikes. In this case, with XOM at, say, $77, the delta is +0.388, and all other greeks are negligible. At this particular price point in the underlying, the trader has almost pure leveraged delta exposure. But this trade would be positioned for only a small move, not much above $80. A speculator wanting to trade direction for a small move while eliminating theta and vega risks achieves her objectives very well with a vertical spread.
A bullish-to-neutral trader would be inclined to sell this spread if ExxonMobil were around $80 or higher. Day by day, the 1.30 premium would start to come in. With 40 days until expiration, theta would be small, only 0.004. But if the stock remained at $80, this ATM put would begin decaying faster and faster. The objective of trading this spread fo